EXHIBIT 2.1

                         AGREEMENT AND PLAN OF MERGER


                                 BY AND AMONG

                        NEWBRIDGE NETWORKS CORPORATION

                           SATURN ACQUISITION CORP.

                                      AND

                       STANFORD TELECOMMUNICATIONS, INC.



                           Dated as of June 22, 1999


                               TABLE OF CONTENTS


                                                                    Page
                                                                    ----
                                                                 
ARTICLE I -- THE MERGER...........................................     2
 1.1  The Merger..................................................     2
 1.2  Closing; Effective Time.....................................     2
 1.3  Effects of the Merger.......................................     2
 1.4  Certificate of Incorporation; Bylaws........................     2
 1.5  Directors and Officers of the Surviving Corporation.........     3

ARTICLE II -- CONVERSION OF SHARES................................     3
 2.1  Conversion of Stock.........................................     3
 2.2  Stel Options; Stock Purchase Plan...........................     5
 2.3  Exchange of Stel Stock Certificates.........................     7
 2.4  Lost, Stolen or Destroyed Certificates......................     8
 2.5  Tax Consequences............................................     9

ARTICLE III -- REPRESENTATIONS AND WARRANTIES OF STEL.............     9
 3.1  Organization, Etc...........................................     9
 3.2  Authority Relative to This Agreement........................    10
 3.3  No Violations, Etc..........................................    10
 3.4  Board Recommendation........................................    11
 3.5  Fairness Opinion............................................    11
 3.6  Capitalization..............................................    12
 3.7  SEC Filings.................................................    12
 3.8  Financial Statements........................................    13
 3.9  Absence of Undisclosed Liabilities..........................    13
 3.10 Absence of Changes or Events................................    13
 3.11 Capital Stock of Subsidiaries...............................    15
 3.12 Litigation..................................................    15
 3.13 Insurance...................................................    16
 3.14 Contracts and Commitments...................................    16
 3.15 Labor Matters; Employment and Labor Contracts...............    18
 3.16 Compliance with Laws........................................    18
 3.17 Government Contracts........................................    19
 3.18 Intellectual Property Rights................................    22
 3.19 Accounts Receivable; Inventories............................    24
 3.20 Order Backlog...............................................    24
 3.21 Product and Service Warranties..............................    25
 3.22 Taxes.......................................................    25
 3.23 Employee Benefit Plans; ERISA...............................    25
 3.24 Environmental Matters.......................................    27
 3.25 Officer's Certificate as to Tax Matters.....................    30
 3.26 Affiliates..................................................    34
 3.27 Finders or Brokers..........................................    34
 3.28 Registration Statement; Proxy Statement/Prospectus..........    34
 3.29 Title to Property...........................................    34


                                       1


                               TABLE OF CONTENTS


                                                                                     Page
                                                                                     ----
                                                                                  

 3.30 Year 2000 Compliance.....................................................        35

ARTICLE IV -- REPRESENTATIONS AND WARRANTIES OF NEWBRIDGE AND MERGER SUB.......        35
 4.1  Organization, Etc........................................................        36
 4.2  Authority Relative to This Agreement.....................................        36
 4.3  No Violations, Etc.......................................................        37
 4.4  Capitalization...........................................................        37
 4.5  Registration Statement; Proxy Statement/Prospectus.......................        37
 4.6  SEC Filings..............................................................        38
 4.7  Compliance with Laws.....................................................        38
 4.8  Financial Statements.....................................................        38
 4.9  Absence of Undisclosed Liabilities.......................................        39
 4.10 Absence of Changes or Events.............................................        39
 4.11 Litigation...............................................................        39

ARTICLE V -- COVENANTS.........................................................        39
 5.1  Conduct of Business During Interim Period................................        39
 5.2  No Solicitation..........................................................        41
 5.3  Access to Information....................................................        43
 5.4  Special Meeting; Registration Statement; Board
      Recommendation...........................................................        44
 5.5  Commercially Reasonable Efforts..........................................        46
 5.6  Public Announcements.....................................................        46
 5.7  Notification of Certain Matters..........................................        47
 5.8  Indemnification..........................................................        47
 5.9  Affiliate Agreements.....................................................        48
 5.10 NYSE Listing.............................................................        49
 5.11 Resignation of Directors and Officers....................................        49
 5.12 Form S-8.................................................................        49
 5.13 SEC Filings..............................................................        49
 5.14 Employee Matters.........................................................        50
 5.15 Termination of Stel Purchase Plan........................................        50
 5.16 Stock Option Agreement...................................................        51
 5.17 Technology Option Agreement..............................................        51
 5.18 Non-core Asset Sale......................................................        51
 5.19 Assumption of Options....................................................        51
 5.20 Transitional Contract-Manufacturing Arrangement..........................        51
 5.21 Stel IP Rights...........................................................        51

ARTICLE VI --CONDITIONS TO THE OBLIGATIONS OF EACH PARTY.......................        52
 6.1  Registration Statement...................................................        52
 6.2  Stockholder Approval.....................................................        52
 6.3  Listing of Additional Shares.............................................        52
 6.4  Government Clearances....................................................        52
 6.5  Statute or Decree........................................................        52


                                       2


                               TABLE OF CONTENTS


                                                                                           Page
                                                                                           ----
                                                                                        

ARTICLE VII -- CONDITIONS TO THE OBLIGATIONS OF STEL AND NEWBRIDGE.................          53
 7.1  Additional Conditions To The Obligations Of Stel.............................          53
 7.2  Additional Conditions To The Obligations Of Newbridge And Merger Sub.........          53

ARTICLE VIII -- TERMINATION........................................................          55
 8.1  Termination..................................................................          55
 8.2  Notice of Termination; Effect of Termination.................................          57
 8.3  Fees and Expenses............................................................          58

ARTICLE IX -- MISCELLANEOUS........................................................          59
 9.1  Amendment and Modification...................................................          59
 9.2  Waiver of Compliance; Consents...............................................          59
 9.3  Survival; Investigations.....................................................          59
 9.4  Notices......................................................................          59
 9.5  Assignment; Third Party Beneficiaries........................................          60
 9.6  Governing Law................................................................          61
 9.7  Counterparts.................................................................          61
 9.8  Severability.................................................................          61
 9.9  Interpretation...............................................................          61
 9.10 Entire Agreement.............................................................          61
 9.11 Definition of "law"..........................................................          61
 9.12 Rules of Construction........................................................          61


                                       3


Exhibits
- --------

     Exhibit A           Stock Option Agreement

     Exhibit B           Technology Option Agreement

     Exhibit C           Form of Voting Agreement

     Exhibit D           Certificate of Merger

     Exhibit E           Form of CVR Agreement

     Exhibit F           Form of Stel Affiliates Agreement

     Schedule 5.8(b)     Other Indemnified Parties

     Schedule 5.14       Employee Severance

     Schedule 7.1(h)     Employment Agreements




                                                    
"Accounts Receivable"                                  Section 3.19(a)
"Acquisition Proposal"..............................   Section 5.2(c)
"Acquisition Transaction"...........................   Section 5.2(c)
"Action"............................................   Section 3.12(a)
"Affiliates"........................................   Section 3.26
"Antitrust Division"................................   Section 5.5
"CERCLA"............................................   Section 3.24(a)(iii)
"CFIUS".............................................   Section 5.5
"Certificate of Merger".............................   Section 1.2
"Closing"...........................................   Section 1.2
"Closing Date"......................................   Section 1.2
"COBRA".............................................   Section 3.15(b)
"Code"..............................................   Recitals
"Confidentiality Agreement".........................   Section 5.3
"Contingent Value Ratio"............................   Section 2.1(a)(ii)
"Contractor"........................................   Section 3.24(a)(i)
"CVR Agreement".....................................   Section 2(a)(iii)
"CVR Certificates...................................   Section 2(b)
"Delaware Law"......................................   Section 1.1
"Effective Time"....................................   Section 1.2
"End Date"..........................................   Section 8.1(b)
"Employee Benefit Plans"............................   Section 3.23(a)
"Environment".......................................   Section 3.24(a)(ii)
"Environmental Law".................................   Section 3.24(a)(iii)
"Environmental Permit"..............................   Section 3.24(a)(iv)
"ERISA".............................................   Section 3.23(a)
"ERISA Affiliate"...................................   Section 3.23(a)
"Exchange Act"......................................   Section 3.3
"Exchange Agent"....................................   Section 2.3(a)
"Exchange Fund".....................................   Section 2.3(c)
"Exchange Ratio"....................................   Section 2.1(a)(i)
"Exon-Florio Amendment".............................   Section 3.3
"Foreign Plan"......................................   Section 3.23(n)
"FTC"...............................................   Section 5.5
"GAAP"..............................................   Section 3.8
"Government Bid"....................................   Section 3.17(a)(ii)
"Government Contract"...............................   Section 3.17(a)(iii)
"Government Entity".................................   Section 3.3
"Government Body"...................................   Section 3.17(a)(i)
"Group Health Plan".................................   Section 3.23(k)
"Hazardous Material"................................   Section 3.24(a)(v)
"Holder"............................................   Section 2.3(c)
"HSR Act"...........................................   Section 3.3




                                                    
"Indemnified Parties"...............................   Section 5.8(b)
"IRS"...............................................   Section 3.22(b)(iii)
"law"...............................................   Section 9.11
"Legal Requirement".................................   Section 3.17(a)(iv)
"Maturity Date".....................................   Section 2.1(a)(ii)
"Merger"............................................   Recitals
"Merger Sub"........................................   Preamble
"Merger Sub Common Stock"...........................   Section 2.1(d)
"Newbridge".........................................   Preamble
"Newbridge Adjustment Option".......................   Section 2.1(a)(i)
"Newbridge Balance Sheet"...........................   Section 4.8
"Newbridge Certificates"............................   Section 2.1(b)
"Newbridge Closing Value"...........................   Section 2.1(a)(i)
"Newbridge Common Stock"............................   Recitals
"Newbridge Disclosure Statement"....................   Article IV
"Newbridge Exchange Options"........................   Section 2.2(a)(iii)
"Newbridge Financial Statements"....................   Section 4.8
"Newbridge Fractional Share Value"..................   Section 2.1(f)
"Newbridge Material Adverse Effect".................   Section 4.1(a)
"Newbridge Material Subsidiaries....................   Section 4.1(a)
"Newbridge SEC Reports".............................   Section 4.6
"Newbridge Stock Certificate".......................   Section 2.1(b)
"Non-core Assets"...................................   Section 5.18
"Non-core Asset Sale"...............................   Section 5.18
"Non-core Asset Sale Proceeds"......................   Section 2.1(a)(ii)
"Notice of Superior Proposal".......................   Section 5.4(c)
"Pension Benefit Plans".............................   Section 3.23(a)
"Person"............................................   Section 2.1(g)
"Potential Acquiror"................................   Section 5.2(a)
"Proxy Statement/Prospectus"........................   Section 3.28
"Real Property".....................................   Section 3.24(b)(iv)
"Reference Date"....................................   Section 3.8
"Registration Statement"............................   Section 3.3
"Returns"...........................................   Section 3.22(b)(i)
"Stel"..............................................   Preamble
"Stel Affiliates"...................................   Section 5.9
"Stel Affiliates Agreement".........................   Section 5.9
"Stel Balance Sheet"................................   Section 3.8
"Stel Certificate"..................................   Section 2.3(c)
"Stel Common Stock".................................   Recitals
"Stel Contract".....................................   Section 3.14(b)
"Stel Disclosure Statement".........................   Article III
"Stel Financial Statements".........................   Section 3.8




                                                    
"Stel IP Rights"....................................   Section 3.18(a)
"Stel Material Adverse Effect"......................   Section 3.1(a)
"Stel Options"......................................   Section 2.2(a)
"Stel Purchase Plan"................................   Section 2.2(b)
"Stel Rights".......................................   Section 3.4
"Stel Rights Plan"..................................   Section 3.4
"Stel SEC Reports"..................................   Section 3.7(a)
"Stel Special Meeting"..............................   Section 5.4(a)
"Stel Stock Plans"..................................   Section 2.2(a)
"Stel Triggering Event".............................   Section 8.1(i)
"SEC"...............................................   Section 3.7(a)
"Securities Act"....................................   Section 3.7(a)
"Stock Option Agreement"............................   Recitals
"Subsidiary"........................................   Section 2.1(g)
"Superior Proposal".................................   Section 5.2(d)
"Surviving Corporation".............................   Section 1.1
"Tax" or "Taxes"....................................   Section 3.22(a)
"Technology Option Agreement".......................   Recitals
"Termination Fee"...................................   Section 8.3(b)(i)
"Third Party".......................................   Section 5.2(c)
"Voting Agreements".................................   Recitals
"Welfare Benefit Plans".............................   Section 3.23(a)
"Year 2000 Compliant"...............................   Section 3.30




                         AGREEMENT AND PLAN OF MERGER


          This AGREEMENT AND PLAN OF MERGER (this "Agreement") is made and
entered into as of June 22, 1999 by and among Newbridge Networks Corporation, a
Canadian corporation ("Newbridge"), Saturn Acquisition Corp., a Delaware
corporation and wholly-owned subsidiary of Newbridge ("Merger Sub"), and
Stanford Telecommunications, Inc., a Delaware corporation ("Stel"), with respect
to the following facts:

          A.  The respective boards of directors of Newbridge, Merger Sub and
Stel have approved and declared advisable the merger of Merger Sub with and into
Stel (the "Merger"), upon the terms and subject to the conditions set forth
herein, and have determined that the Merger and the other transactions are fair
to, and in the best interests of, their respective stockholders.

          B.  Pursuant to the Merger, among other things, the outstanding shares
of Stel Common Stock, $.01 par value ("Stel Common Stock"), will be converted
into Common Shares of Newbridge ("Newbridge Common Stock"), at the rate set
forth herein.

          C.  For United States federal income tax purposes, it is intended that
the Merger will qualify as a reorganization under the provisions of Section
368(a) of the Internal Revenue Code of 1986, as amended (the "Code").

          D.  Simultaneously with the execution and delivery of this Agreement
and as a condition and inducement to Newbridge's and the Merger Sub's
willingness to enter into this Agreement, Newbridge is entering into a Stock
Option Agreement dated the date hereof in the form of Exhibit A (the "Stock
                                                      ---------
Option Agreement") with Stel, pursuant to which Stel is granting to Newbridge
the right and option to purchase shares of Stel Common Stock from Stel equal to
up to 19.9% of issued and outstanding Stel Common Stock.

          E.  Simultaneously with the execution and delivery of this Agreement
and as a condition and inducement to Newbridge's and the Merger Sub's
willingness to enter into this Agreement, Newbridge is entering into the
Wireless Broadband Products Technology License Option Agreement in the form of
Exhibit B (the "Technology Option Agreement") with Stel.
- ---------

          F.  Simultaneously with the execution and delivery of this Agreement
and as a condition and inducement to Newbridge's and the Merger Sub's
willingness to enter into this Agreement, Newbridge is entering into Voting
Agreements in the form of Exhibit C with certain directors and officers of Stel
                          ---------
in their respective capacities as stockholders of Stel (the "Voting
Agreements").


     The parties agree as follows:

                                   ARTICLE I

                                   THE MERGER


     1.1  The Merger. At the Effective Time (as defined in Section 1.2) and
subject to and upon the terms and conditions of this Agreement and the
applicable provisions of Delaware General Corporation Law (the "Delaware Law"),
(i) Merger Sub shall be merged with and into Stel, (ii) the separate corporate
existence of Merger Sub shall cease, and (iii) Stel shall be the surviving
corporation. Stel as the surviving corporation after the Merger is hereinafter
sometimes referred to as the "Surviving Corporation."

     1.2  Closing; Effective Time. The closing of the Merger and the other
transactions contemplated hereby (the "Closing") will take place at 10:00 a.m.,
local time, on a date to be specified by the parties (the "Closing Date"), which
shall be no later than the first business day after satisfaction or waiver of
the conditions set forth in Articles VI and VII, unless another time or date is
agreed to by the parties hereto. The Closing shall take place at the offices of
Heller Ehrman White & McAuliffe, 525 University Avenue, Palo Alto, California,
or at such other location as the parties hereto shall mutually agree. At the
Closing, the parties hereto shall cause the Merger to be consummated by filing a
certificate of merger substantially in the form of Exhibit D (the "Certificate
                                                   ---------
of Merger") with the Secretary of State of the State of Delaware, in accordance
with the relevant provisions of the Delaware Law (the time of such filing, or
such later time as may be agreed in writing by the parties and specified in the
Certificate of Merger, being the "Effective Time").

     1.3  Effects of the Merger. The effects of the Merger shall be as provided
in this Agreement, the Certificate of Merger and the applicable provisions of
the Delaware Law. Without limiting the foregoing, at the Effective Time all the
property, rights, privileges, powers and franchises of Stel and Merger Sub shall
vest in the Surviving Corporation, and all debts, liabilities and duties of Stel
and Merger Sub shall become the debts, liabilities and duties of the Surviving
Corporation.

     1.4  Certificate of Incorporation; Bylaws.

          (a) Subject to Section 5.8, from and after the Effective Time, the
certificate of incorporation of Stel, as in effect immediately prior to the
Effective Time, shall be the certificate of incorporation of the Surviving
Corporation, until changed or amended as provided by law.

          (b) Subject to Section 5.8, from and after the Effective Time, the
bylaws of Merger Sub, as in effect immediately prior to the Effective Time,
shall be the bylaws of the Surviving Corporation.

                                       2


     1.5  Directors and Officers of the Surviving Corporation. The directors and
officers of Merger Sub immediately prior to the Effective Time shall serve as
the initial directors and officers of the Surviving Corporation, until their
respective successors are duly elected or appointed and qualified.

                                   ARTICLE II

                              CONVERSION OF SHARES



     2.1  Conversion of Stock. Pursuant to the Merger, and without any action on
the part of the holders of any outstanding shares of capital stock or other
securities of Stel or Merger Sub:

          (a)  As of the Effective Time:

               (i)    each share of Stel Common Stock issued and outstanding
immediately prior to the Effective Time (other than shares of Stel Common Stock
to be canceled pursuant to Section 2.1(c)) shall be automatically converted into
the right to receive that number of shares (the "Exchange Ratio") of fully paid
and nonassessable Newbridge Common Stock that equals U.S. $30.00 divided by the
average closing price per share of Newbridge Common Stock as reported on the New
York Stock Exchange ("NYSE") Composite Tape on the ten trading days ending on
the fifth trading day immediately preceding the Stel Special Meeting (the
"Newbridge Closing Value"). Notwithstanding the foregoing, if the Newbridge
Closing Value is less than U.S. $24.00, the Exchange Ratio shall be 1.25;
provided, however, that, in such event, Newbridge shall have the option (the
"Newbridge Adjustment Option"), exercisable by notice to Stel prior to the close
of business on the third trading day prior to the Stel Special Meeting, to
adjust the Exchange Ratio, to an amount that exceeds 1.25;

               (ii)   if the "Non-core Asset Sale" (as defined in Section 5.18)
has closed on or prior to the Effective Time, the holder of each share of Stel
Common Stock shall have the right to receive for each share of Stel Common
Stock, an additional fraction of a share (the "Contingent Value Ratio") of fully
paid and nonassessable Newbridge Common Stock as is determined using the
following formula:

                                   [B+C-D+E]
                                   --------- divided by v
                                      SS

where,

     "B" equals the lesser of (A) the gross proceeds from the Non-core Asset
     Sale before deduction of any state and federal income taxes payable on such
     proceeds (the "Non-core Asset Sale Proceeds") and (B) $173,000,000, minus
     $102,000,000;

                                       3


     "C" equals 50% of the greater of (A) the Non-core Asset Sale Proceeds minus
     $173,000,000 and (B) 0;

     "D" equals 50% of any state and federal income taxes payable on the Non-
     core Asset Sale Proceeds, based on the applicable rates as determined in
     good faith by Newbridge;

     "E" equals $625,000;

     "SS" equals the number of shares of Stel Common Stock and Stel Options
     issued and outstanding immediately prior to the Effective Time (other than
     shares of Stel Common Stock to be canceled pursuant to Section 2.1(c)); and

     "V" equals the greater of (a) the Newbridge Closing Value and (b) $24.00,
     unless the Newbridge Adjustment Option is exercised, in which case "V"
     equals $30.00 divided by the Exchange Ratio;

          in the event that any consideration received from the Non-core Asset
Sale is not cash or is affected by some contingency, the parties shall appoint
an independent expert in business valuation to calculate the net present value
of such consideration, and such amount shall be included in the calculation of
the Non-core Asset Sale Proceeds;.

               (iii)  if the Non-core Asset Sale has not closed on or prior to
the Effective Time, the holder of each share of Stel Common Stock, shall have
the right to receive, for each share of Stel Common Stock, one contingent value
right ("CVR"), with substantially the terms set forth in the form of Contingent
Value Rights Agreement attached hereto as Exhibit E (the "CVR Agreement").
                                          ---------

          (b)  As of the Effective Time, each holder of a certificate or
certificates which immediately prior to the Effective Time represented
outstanding shares of Stel Common Stock shall cease to have any rights with
respect thereto, except the right to receive (i) a certificate (or direct
registration) representing the number of whole shares of Newbridge Common Stock
into which such shares have been converted (the "Newbridge Stock Certificates"),
(ii) cash in lieu of fractional shares of Newbridge Common Stock in accordance
with Section 2.1(f), without interest, and (iii) in the event the Non-core Asset
Sale has not closed prior to the Effective Time, a certificate (or direct
registration) representing the CVRs (the "CVR Certificates" and, together with
the Newbridge Stock Certificates, the "Newbridge Certificates").

          (c)  As of the Effective Time, each share of Stel Common Stock held of
record immediately prior to the Effective Time by Stel, Merger Sub, Newbridge or
any wholly-owned subsidiary of Stel or of Newbridge shall be canceled and
extinguished without any conversion thereof.

                                       4


          (d)  As of the Effective Time, each share of Common Stock, $0.01 par
value, of Merger Sub (the "Merger Sub Common Stock") issued and outstanding
immediately prior to the Effective Time shall be canceled, extinguished and
automatically converted into one validly issued, fully paid and nonassessable
share of Common Stock, $0.01 par value, of the Surviving Corporation. Each
certificate evidencing ownership of a number of shares of Merger Sub Common
Stock shall be deemed to evidence ownership of the same number of shares of
Common Stock, $0.01 par value, of the Surviving Corporation.

          (e)  The Exchange Ratio shall be adjusted, or Newbridge shall make
appropriate provision, to reflect appropriately the effect of any stock split,
reverse stock split, stock dividend (including any dividend or distribution of
securities convertible into Newbridge Common Stock or Stel Common Stock),
reorganization, recapitalization or other like change with respect to Newbridge
Common Stock or (subject to Section 5.1) Stel Common Stock occurring or having a
record date or an effective date on or after the date hereof and prior to the
Effective Time.

          (f)  No fraction of a share of Newbridge Common Stock will be issued
by virtue of the Merger. Instead, each holder of shares of Stel Common Stock who
would otherwise be entitled to a fraction of a share of Newbridge Common Stock
(after aggregating all fractional shares of Newbridge Common Stock to be
received by such holder) shall receive from Newbridge an amount of cash (rounded
down to the nearest whole cent) equal to the product of (i) such fraction,
multiplied by (ii) the Newbridge Fractional Share Value. For the purposes of
this Agreement, "Newbridge Fractional Share Value" shall mean the closing price
per share of Newbridge Common Stock as reported on the NYSE Composite Tape on
the trading day immediately preceding the Effective Time.

          (g)  For purposes of this Agreement, (i) the term "Subsidiary", when
used with respect to any Person, means any corporation or other organization,
whether incorporated or unincorporated, of which (A) at least a majority of the
securities or other interests having by their terms ordinary voting power to
elect a majority of the board of directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by such Person (through ownership of securities,
by contract or otherwise) or (B) such Person or any Subsidiary of such Person is
a general partner of any general partnership or a manager of any limited
liability company. For the purposes of this Agreement, the term "Person" means
any individual, group, organization, corporation, partnership, joint venture,
limited liability company, trust or entity of any kind.

          2.2  Stel Options; Stock Purchase Plan.

               (a)    As of the Effective Time, Newbridge shall, to the full
extent permitted by applicable law, assume all of the stock options of Stel
outstanding

                                       5


immediately prior to the Effective Time under the Stel Stock Plans (as defined
below) (the "Stel Options"). For purposes of this Agreement, "Stel Stock Plans"
means Stel's 1982 Stock Option Plan, and 1991 Stock Option Plan. Each Stel
Option, whether or not exercisable at the Effective Time, shall, to the full
extent permitted by applicable law, be assumed by Newbridge in such a manner
that it shall be exercisable upon the same terms and conditions as under the
Stel Stock Plan pursuant to which it was granted and the applicable option
agreement issued thereunder; provided that:

               (i)    if the Non-core Asset Sale has closed on or prior to the
Effective Time, (A) each such option shall thereafter be exercisable for the
number of shares of Newbridge Common Stock (rounded down to the nearest whole
share) equal to the product obtained from multiplying the number of shares of
Stel Common Stock covered by such option immediately prior to the Effective Time
by the sum of the Exchange Ratio and the Contingent Value Ratio and (B) the
option price per share of Newbridge Common Stock thereafter shall be equal to
the quotient (rounded up to the nearest whole cent) obtained from dividing the
option price per share of Stel Common Stock subject to such option in effect
immediately prior to the Effective Time by the sum of the Exchange Ratio and the
Contingent Value Ratio;

               (ii)   if the Non-core Asset Sale does not close on or prior to
the Effective Time and a Stel Option is exercised on or prior to the Maturity
Date of the CVRs, (A) each option shall be exercisable for (1) the number of
shares of Newbridge Common Stock (rounded down to the nearest whole share) equal
to the product obtained from multiplying the number of shares of Stel Common
Stock covered by such option immediately prior to the Effective Time by the
Exchange Ratio and (2) the number of CVRs equal to the number of shares of Stel
Common Stock covered by such option immediately prior to the Effective Time and
(B) the option price thereafter shall be equal to the quotient (rounded up the
nearest whole cent) obtained from dividing the option price per share of Stel
Common Stock subject to such option in effect immediately prior to the Effective
Time by the Exchange Ratio; and

               (iii)  if the Non-core Asset Sale does not close on or prior to
the Effective Time, and a Stel Option is exercised after the Maturity Date of
the CVRs, such option shall thereafter be exercisable as described in Section
2.2(a)(i).

Stel Options assumed in the manner described in this Section are referred to in
this Agreement as the "Newbridge Exchange Options". Prior to the Effective Time,
Stel shall make all adjustments provided for in the Stel Stock plan with respect
to the Stel Options to facilitate the implementation of the provisions of this
Section 2.2(a).

          (b)  All the purchase rights under Stel's 1992 Employee Stock Purchase
Plan ("Stel Purchase Plan") shall terminate following the purchase of shares in
respect of the Participation Period (as defined in the Stel Purchase Plan)
beginning on or about June 30, 1999 and no Participation Period shall be
commended thereafter. All funds

                                       6


contributed to the Stel Purchase Plan that have not been used to purchase shares
of Stel Common Stock by the termination date of the Stel Purchase Plan shall be
returned after such termination date in accordance with Section 8 of the Stel
Purchase Plan.

     2.3  Exchange of Stel Stock Certificates.

          (a)  At or prior to the Effective Time, Newbridge shall enter into an
agreement with a bank or trust company selected by Newbridge to act as the
exchange agent for the Merger (the "Exchange Agent").

          (b)  At or prior to the Effective Time, Newbridge shall supply or
cause to be supplied to or for the account of the Exchange Agent in trust for
the benefit of the holders of Stel Common Stock, for exchange pursuant to this
Section 2.3 (i) the Newbridge Stock Certificates issuable pursuant to Section
2.1 to be exchanged for outstanding shares of Stel Common Stock, (ii) cash in an
aggregate amount sufficient to make the payments in lieu of fractional shares
provided for in Section 2.1(f), and (iii) in the event the Non-core Asset Sale
has not closed prior to the Effective Time, the CVR Certificates.

          (c)  Promptly after the Effective Time, Newbridge shall mail or shall
cause to be mailed to each Holder a letter of transmittal (which shall specify
that delivery shall be effected, and risk of loss and title to the Stel
Certificates shall pass, only upon proper delivery of the Stel Certificates to
the Exchange Agent) and instructions for surrender of the Stel Certificates.
Upon surrender to the Exchange Agent of a Stel Certificate, together with such
letter of transmittal duly executed, the Holder shall be entitled to receive in
exchange therefor (i) Newbridge Stock Certificates evidencing that number of
shares of Newbridge Common Stock issuable to such Holder in accordance with this
Article II; (ii) any dividends or other distributions that such Holder has the
right to receive pursuant to Section 2.3(d); (iii) cash in respect of fractional
shares as provided in Section 2.1(f); and (iv) in the event the Non-core Asset
Sale has not closed prior to the Effective Time, CVR Certificates evidencing
that number of CVRs issuable to such Holder in accordance with this Article II,
and such Stel Certificate so surrendered shall forthwith be canceled. Such
Newbridge Certificates, dividends and other distributions and cash are referred
to collectively as the "Exchange Fund." No Newbridge Certificates will be issued
to a Person who is not the registered owner of a surrendered Stel Certificate,
unless (i) the Stel Certificate so surrendered has been properly endorsed or
otherwise is in proper form for transfer, and (ii) such Person shall either (A)
pay any transfer or other tax required by reason of such issuance or (B)
establish to the satisfaction of the Surviving Corporation that such tax has
been paid or is not applicable. Until surrendered in accordance with the
provisions of this Section 2.3, from and after the Effective Time, each Stel
Certificate shall be deemed to represent, for all purposes other than payment of
dividends, the right to receive a certificate representing the number of full
shares of Newbridge Common Stock as determined in accordance with this Article
II,

                                       7


cash in lieu of fractional shares as provided in Section 2.1(f) and a
certificate representing the number of CVRs as determined in accordance with
this Article II. For purposes of this Agreement, "Stel Certificate" means a
certificate which immediately prior to the Effective Time represented shares of
Stel Common Stock, and "Holder" means a person who holds one or more Stel
Certificates as of the Effective Time.

          (d)  No dividend or other distribution declared with respect to
Newbridge Common Stock with a record date after the Effective Time will be paid
to Holders of unsurrendered Stel Certificates until such Holders surrender their
Stel Certificates. Upon the surrender of such Stel Certificates, there shall be
paid to such Holders, promptly after such surrender, the amount of dividends or
other distributions, excluding interest, declared with a record date after the
Effective Time and not paid because of the failure to surrender Stel
Certificates for exchange.

          (e)  Any portion of the Exchange Fund which remains undistributed to
the former stockholders of Stel for twelve (12) months after the Effective Time
shall be delivered to Newbridge, upon demand of Newbridge, and any such former
stockholders who have not theretofore complied with this Section 2.3 shall
thereafter look only to Newbridge for payment of their claims for Newbridge
Common Stock, any cash in lieu of fractional shares of Newbridge Common Stock,
any dividends or distributions with respect to Newbridge Common Stock and any
CVRs.

          (f)  Notwithstanding anything to the contrary in this Agreement, none
of the Exchange Agent, Newbridge, the Surviving Corporation nor any party hereto
shall be liable to any holder of shares of Stel Common Stock for shares of
Newbridge Common Stock or cash in lieu of fractional shares delivered to a
public official pursuant to any applicable abandoned property, escheat or
similar law.

     2.4  Lost, Stolen or Destroyed Certificates. In the event that any Stel
Certificates shall have been lost, stolen or destroyed, the Exchange Agent shall
issue and pay in respect of such lost, stolen or destroyed Stel Certificates,
upon the making of an affidavit of that fact by the holder thereof, Newbridge
Stock Certificates evidencing the shares of Newbridge Common Stock and CVR
Certificates evidencing the CVRs, each as may be required pursuant to Section
2.1, cash in respect of fractional shares, if any, as may be required by Section
2.1(f) and any dividends or distributions payable pursuant to Section 2.3(d);
provided, however, that Newbridge may, in its discretion and as a condition
precedent to the issuance thereof, require the owner of such lost, stolen or
destroyed Stel Certificate to deliver a bond in such sum as it may reasonably
direct as indemnity against any claim that may be made against Newbridge or the
Exchange Agent with respect to the Stel Certificates alleged to have been lost,
stolen or destroyed.

                                       8


     2.5  Tax Consequences.  For United States federal income tax purposes,
it is intended by the parties hereto that the Merger qualify as a reorganization
within the meaning of Section 368(a) of the Code.

                                  ARTICLE III

                    REPRESENTATIONS AND WARRANTIES OF STEL

     Stel makes to Newbridge and Merger Sub the representations and warranties
contained in this Article III, in each case subject to the exceptions set forth
in the disclosure statement, dated as of the date hereof (the "Stel Disclosure
Statement"). The Stel Disclosure Statement shall be arranged in schedules
corresponding to the numbered and lettered Sections of this Article III, and the
disclosure in any Schedule of the Stel Disclosure Statement shall qualify only
the corresponding Section of this Article III.

     3.1  Organization, Etc.

          (a)  Each of Stel and its Subsidiaries is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction of its incorporation, and has all requisite power and authority to
own, lease and operate its properties and to carry on its business as now being
conducted. Each of Stel and its Subsidiaries is duly qualified as a foreign
Person to do business, and is in good standing, in each jurisdiction where the
character of its owned or leased properties or the nature of its activities
makes such qualification necessary, except where the failure to be so qualified
or in good standing would not, individually or in the aggregate, have a Stel
Material Adverse Effect. For the purposes of this Agreement, "Stel Material
Adverse Effect" means any change, event or effect that is materially adverse to
either (i) the business, operations or assets of Stel's wireless broadband
products division or its telecom products components division, or (ii) the
general affairs, business, operations, assets, condition (financial or
otherwise) or results of operations of Stel and its Subsidiaries taken as a
whole.

          (b)  Stel is not in violation of any provision of its certificate of
incorporation or bylaws. None of Stel's Subsidiaries is in violation of its
certificate of incorporation or other charter document or in material violation
of its bylaws. Schedule 3.1(b) of the Stel Disclosure Statement sets forth (i)
the full name of each Subsidiary of Stel, its capitalization and the ownership
interest of Stel and each other Person (if any) therein, (ii) the jurisdiction
in which each such Subsidiary is organized, (iii) each jurisdiction in which
Stel and each Subsidiary of Stel is qualified to do business as a foreign
Person, (iv) a brief summary of the business and material operations of each
Subsidiary of Stel, and (v) the names of the current directors and officers of
Stel and of each Subsidiary of Stel. Stel has made available to Newbridge
accurate and complete copies of the certificate of incorporation, bylaws and any
other charter documents, as currently in effect, of Stel and each of its
Subsidiaries.

                                       9


     3.2  Authority Relative to This Agreement. Stel has full corporate power
and authority to (i) execute and deliver this Agreement, (ii) execute and
deliver the Stock Option Agreement, (iii) execute and deliver the Technology
Option Agreement, (iv) consummate the transactions contemplated by the Stock
Option Agreement and Technology Option Agreement, and (v) assuming the approval
of the Merger by a majority of the outstanding shares of Stel Common Stock at
the Stel Special Meeting or any adjournment or postponement thereof in
accordance with Delaware Law, consummate the Merger and the other transactions
contemplated hereby. The execution and delivery of this Agreement, the Stock
Option Agreement and the Technology Option Agreement, and the consummation of
the Merger and the other transactions contemplated hereby and thereby, have been
duly and validly authorized by the unanimous vote of the board of directors of
Stel, and no other corporate proceedings on the part of Stel are necessary to
authorize this Agreement, the Stock Option Agreement and the Technology Option
Agreement or to consummate the Merger and the other transactions contemplated
hereby and thereby (other than, with respect to the Merger, the approval of the
Merger by a majority of the outstanding shares of Stel Common Stock at the Stel
Special Meeting or any adjournment or postponement thereof in accordance with
the Delaware Law). Each of this Agreement, the Stock Option Agreement and the
Technology Option Agreement has been duly and validly executed and delivered by
Stel and, assuming due authorization, execution and delivery by Newbridge and,
in the case of this Agreement, by Merger Sub, constitutes a valid and binding
agreement of Stel, enforceable against Stel in accordance with its terms, except
to the extent that its enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or other laws affecting the enforcement
of creditors' rights generally or by general equitable principles.

     3.3  No Violations, Etc.  No filing with or notification to, and no
permit, authorization, consent or approval of, any court, administrative agency,
commission, or other governmental or regulatory body, authority or
instrumentality ("Government Entity") is necessary on the part of Stel for the
consummation by Stel of the Merger and the other transactions contemplated
hereby and by the Stock Option Agreement and the Technology Option Agreement, or
for the exercise by Newbridge and the Surviving Corporation of full rights to
own and operate the business of Stel and its Subsidiaries as presently being
conducted, except for (i) the filing of the Certificate of Merger as required by
Delaware Law, (ii) compliance with the applicable requirements of the Securities
Exchange Act of 1934, as amended (together with the Rules and Regulations
promulgated thereunder, the "Exchange Act") including the filing of a proxy
statement on Schedule 14A which is expected to be incorporated into a
Registration Statement on Form S-4 to be filed by Newbridge registering the
Newbridge Common Stock to be issued hereunder (the "Registration Statement"),
state securities or "blue sky" laws and state takeover laws,  (iii) any filing
required under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (the
"HSR Act") and (iv) the voluntary notice to be filed under Section 721 of the
Defense Production Act of 1950, as amended by Section 5021 of the Omnibus Trade
and Competitiveness Act of 1988 (the "Exon-Florio Amendment").  Neither the
execution

                                      10


and delivery of this Agreement, the Stock Option Agreement, and the Technology
Option Agreement nor the consummation of the Merger and the other transactions
contemplated hereby and thereby nor compliance by Stel with all of the
provisions hereof and thereof, nor the exercise by Newbridge and the Surviving
Corporation of full rights to own and operate the business of Stel and its
Subsidiaries as presently being conducted will, subject to obtaining the
approval of this Agreement by the holders of a majority of the outstanding
shares of Stel Common Stock at the Stel Special Meeting or any adjournment
thereof in accordance with Delaware Law, (i) conflict with or result in any
breach of any provision of the certificate of incorporation, bylaws or other
charter document of Stel or any of its Subsidiaries, (ii) violate any material
order, writ, injunction, decree, statute, rule or regulation applicable to Stel,
or any of its Subsidiaries, or by which any of their properties or assets may be
bound, or (iii) result in a violation or breach of, or constitute (with or
without due notice or lapse of time or both) a default under, or result in any
material change in, or give rise to any right of termination, cancellation,
acceleration, redemption or repurchase under, any of the terms, conditions or
provisions of any material note, bond, mortgage, indenture, deed of trust,
license, lease, contract, agreement or other instrument or obligation to which
Stel or any of its Subsidiaries is a party or by which any of them or any of
their properties or assets may be bound. Schedule 3.3 of the Stel Disclosure
Statement lists all consents, waivers and approvals required to be obtained in
connection with the consummation of the transactions contemplated hereby or by
the Stock Option Agreement or Technology Option Agreement under any of Stel's or
any of its Subsidiaries' notes, bonds, mortgages, indentures, deeds of trust,
licenses or leases, contracts, agreements or other instruments or obligations
the failure to obtain which would have a Stel Material Adverse Effect.

     3.4  Board Recommendation. The board of directors of Stel has, at a meeting
of such board duly held on June 21, 1999, unanimously (i) approved and adopted
this Agreement, the Stock Option Agreement and the Technology Option Agreement
(ii) determined that this Agreement is fair to and in the best interests of the
stockholders of Stel, (iii) resolved to recommend approval of this Agreement to
the stockholders of Stel, (iv) resolved that Stel take all action necessary to
exempt the execution and delivery of this Agreement, the Stock Option Agreement
and the Technology Option Agreement and the consummation of the transactions
contemplated hereby and thereby from the provisions of all applicable state
antitakeover statutes and regulations, including, but not limited to, Section
203 of the Delaware Law, and (v) amended the Stel Rights Agreement (the "Stel
Rights Plan") dated as of May 9, 1995 between Stel and the First National Bank
of Boston to render the rights issued thereunder (the "Stel Rights")
inapplicable to the Merger, this Agreement, the Stock Option Agreement and the
Technology Option Agreement and the other transactions contemplated hereby, and
to terminate the Stel Rights Plan as of the Effective Time.

     3.5  Fairness Opinion. Stel has received the opinion of Ferris, Baker,
Watts dated the date of the approval of this Agreement by the board of directors
of Stel to the

                                      11


effect that the Exchange Ratio is fair to Stel's stockholders from a financial
point of view, and has provided a copy of such opinion to Newbridge.

     3.6  Capitalization.

          (a)  The authorized capital stock of Stel consists of 25,000,000
shares of Stel Common Stock. As of June 16, 1999, there were (i) 13,152,959
shares of Stel Common Stock outstanding, and (ii) no treasury shares.

          (b)  Other than the Stel Common Stock, there are no equity securities
of any class of Stel, or any securities convertible into or exercisable for any
such equity securities, issued, reserved for issuance or outstanding. Except for
the Stel Options, Stel Rights, and purchase rights under the Stel Purchase Plan
there are no warrants, options, convertible securities, calls, rights, stock
appreciation rights, preemptive rights, rights of first refusal, or agreements
or commitments of any nature obligating Stel to issue, deliver or sell, or cause
to be issued, delivered or sold, additional shares of capital stock or other
equity interests of Stel, or obligating Stel to grant, issue, extend, accelerate
the vesting of, or enter into, any such warrant, option, convertible security,
call, right, stock appreciation right, preemptive right, right of first refusal,
agreement or commitment. To the knowledge of Stel, except for the Voting
Agreements, there are no voting trusts, proxies or other agreements or
understandings with respect to the capital stock of Stel.

          (c)  True and complete copies of each Stel Stock Plan and the Stel
Purchase Plan, and of the forms of all agreements and instruments relating to or
issued under each thereof, have been made available to Newbridge. Such
agreements, instruments, and forms have not been amended, modified or
supplemented, and there are no agreements to amend, modify or supplement any
such agreements, instruments or forms.

          (d)  Schedule 3.6(d) of the Stel Disclosure Statement sets forth the
following information with respect to Stel Options outstanding as of June 16,
1999: the aggregate number of shares issuable thereunder, the type of option,
the grant date, the expiration date, the exercise price and the vesting
schedule. Each Stel Option was granted in accordance with the terms of the Stel
Stock Plan applicable thereto. The terms of each of the Stel Stock Plans do not
prohibit the assumption of the Stel Options as provided in Section 2.2(a).
Consummation of the Merger will accelerate vesting of all Stel Options, except
those which have been outstanding for less than one year as of the Effective
Time.

     3.7  SEC Filings.

          (a)  Stel has filed with the Securities and Exchange Commission (the
"SEC") all required forms, reports, registration statements and documents
required to be filed by it with the SEC (collectively, all such forms, reports,
registration statements and

                                      12


documents filed since April 1, 1996 are referred to herein as the "Stel SEC
Reports"). All of the Stel SEC Reports complied as to form, when filed, in all
material respects with the applicable provisions of the Securities Act of 1933,
as amended (together with the rules and regulations promulgated thereunder, the
"Securities Act") and the Exchange Act. Accurate and complete copies of the Stel
SEC Reports have been made available to Newbridge. As of their respective dates,
the Stel SEC Reports (including all exhibits and schedules thereto and documents
incorporated by reference therein) did not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein, in light of the circumstances under
which they were made, not misleading. Stel has been advised by each of its
officers and directors that each such person and such persons' affiliates have
complied with all filing requirements under Section 13 and Section 16(a) of the
Exchange Act.

     3.8  Financial Statements. Each of the consolidated financial statements
(including, in each case, any related notes thereto) contained in the Stel SEC
Reports (the "Stel Financial Statements"), (a) was prepared in accordance with
generally accepted accounting principles ("GAAP") applied on a consistent basis
throughout the periods involved (except as may be indicated in the notes thereto
or, in the case of unaudited interim financial statements, as may be permitted
by the SEC on Form 10-Q under the Exchange Act) and (b) fairly presented the
consolidated financial position of Stel and its Subsidiaries as at the
respective dates thereof and the consolidated results of its operations and cash
flows for the periods indicated, consistent with the books and records of Stel,
except that the unaudited interim financial statements were or are subject to
normal and recurring year-end adjustments which were not, or are not expected to
be, material in amount. The balance sheet of Stel contained in Stel's Annual
Report to Stockholders for the year ended March 31, 1999 (the "Reference Date")
is hereinafter referred to as the "Stel Balance Sheet."

     3.9  Absence of Undisclosed Liabilities. Neither Stel nor any of its
Subsidiaries has any liabilities (absolute, accrued, contingent or otherwise)
other than (i) liabilities included in the Stel Balance Sheet and the related
notes to the financial statements, (ii) normal or recurring liabilities incurred
since the Reference Date in the ordinary course of business consistent with past
practice which, individually or in the aggregate, would not be reasonably likely
to have a Stel Material Adverse Effect, and (iii) liabilities under this
Agreement, the Stock Option Agreement and the Technology Option Agreement.

     3.10 Absence of Changes or Events. Except as contemplated by this
Agreement, since the Reference Date no Stel Material Adverse Effect has occurred
and, in addition, Stel and its Subsidiaries have not, directly or indirectly:

          (a)  purchased, otherwise acquired, or agreed to purchase or otherwise
acquire, any shares of capital stock of Stel or any of its Subsidiaries, or
declared, set aside or paid any dividend or otherwise made a distribution
(whether in cash, stock or property

                                      13


or any combination thereof) in respect of their capital stock (other than
dividends or other distributions payable solely to Stel or a wholly owned
Subsidiary of Stel);

          (b)  authorized for issuance, issued, sold, delivered, granted or
issued any options, warrants, calls, subscriptions or other rights for, or
otherwise agreed or committed to issue, sell or deliver any shares of any class
of capital stock of Stel or its Subsidiaries or any securities convertible into
or exchangeable or exercisable for shares of any class of capital stock of Stel
or its Subsidiaries, other than pursuant to and in accordance with the Stel
Stock Plans;

          (c)  (i) created or incurred any indebtedness for borrowed money
exceeding U.S. $100,000 in the aggregate, (ii) assumed, guaranteed, endorsed or
otherwise as an accommodation become responsible for the obligations of any
other individual, firm or corporation, made any loans or advances to any other
individual, firm or corporation exceeding U.S. $100,000 in the aggregate, (iii)
entered into any oral or written material agreement or any commitment or
transaction or incurred any liabilities material to Stel and its Subsidiaries
taken as a whole, or involving in excess of U.S. $100,000;

          (d)  instituted any change in accounting methods, principles or
practices other than as required by GAAP or the rules and regulations
promulgated by the SEC and disclosed in the notes to the Stel Financial
Statements;

          (e)  revalued any assets, including without limitation, writing down
the value of inventory or writing off notes or accounts receivable in excess of
amounts previously reserved as reflected in the Stel Balance Sheet;

          (f)  suffered any damage, destruction or loss, whether covered by
insurance or not, except for such as would not, individually and in the
aggregate exceed $250,000;

          (g)  (i)    increased in any manner the compensation of any of its
directors, officers or, other than in the ordinary course of business and
consistent with past practice, non-officer employees, (ii) granted any severance
or termination pay to any Person; (iii) entered into any oral or written
employment, consulting, indemnification or severance agreement with any Person;
(iv) adopted, become obligated under, or amended any employee benefit plan,
program or arrangement; or (v) repriced any Stel Options;

          (h) sold, transferred, leased, licensed, pledged, mortgaged,
encumbered, or otherwise disposed of, or agreed to sell, transfer, lease,
license, pledge, mortgage, encumber, or otherwise dispose of, any material
properties, (including intangibles, real, personal or mixed);

                                      14


          (i)  amended its certificate of incorporation, bylaws, or any other
charter document, or effected or been a party to any merger, consolidation,
share exchange, business combination, recapitalization, reclassification of
shares, stock split, reverse stock split or similar transaction;

          (j)  made any capital expenditure in any calendar month which, when
added to all other capital expenditures made by or on behalf of Stel and its
Subsidiaries in such calendar month resulted in such capital expenditures
exceeding U.S. $250,000 in the aggregate;

          (k)  paid, discharged or satisfied any material claims, liabilities or
obligations (absolute, accrued, contingent or otherwise), other than the
payment, discharge or satisfaction of liabilities (including accounts payable)
in the ordinary course of business and consistent with past practice, or
collected, or accelerated the collection of, any amounts owed (including
accounts receivable) other than their collection in the ordinary course of
business;

          (l)  waived, released, assigned, settled or compromised any material
claim or litigation, or commenced a lawsuit other than for the routine
collection of bills;

          (m)  agreed or proposed to do any of the things described in the
preceding clauses (a) through (l) other than as expressly contemplated or
provided for in this Agreement.

     3.11 Capital Stock of Subsidiaries. Stel is directly or indirectly the
record and beneficial owner of all of the outstanding shares of capital stock or
other equity interests of each of its Subsidiaries (other than qualifying
shares, the ownership of which is set forth in Schedule 3.11 of the Stel
Disclosure Statement). All of such shares have been duly authorized and are
validly issued, fully paid, nonassessable and free of preemptive rights with
respect thereto and are owned by Stel free and clear of any claim, lien or
encumbrance of any kind with respect thereto. There are no proxies or voting
agreements with respect to such shares, and there are not any existing options,
warrants, calls, subscriptions, or other rights or other agreements or
commitments obligating Stel or any Subsidiaries to issue, transfer or sell any
shares of capital stock of any Subsidiary or any other securities convertible
into, exercisable for, or evidencing the right to subscribe for any such shares.
Stel does not directly or indirectly own any interest in any Person except the
Subsidiaries.

     3.12 Litigation.

          (a)  There is no private or governmental claim, action, suit (whether
in law or in equity), investigation or proceeding of any nature ("Action")
pending or, to the knowledge of Stel, threatened against Stel or any of its
Subsidiaries, or any of their respective officers and directors (in their
capacities as such), or involving any of their

                                      15


assets, before any court, governmental or regulatory authority or body, or
arbitration tribunal, except for those Actions which, individually and in the
aggregate, would not have a Stel Material Adverse Effect. There is no Action
pending or, to the knowledge of Stel, threatened which in any manner challenges,
seeks to, or is reasonably likely to prevent, enjoin, alter or delay the
transactions contemplated by this Agreement, the Stock Option Agreement or the
Technology Option Agreement.

          (b)  There is no outstanding judgment, order, writ, injunction or
decree of any court, governmental or regulatory authority or body, or
arbitration tribunal in a proceeding to which Stel, any Subsidiary of Stel, or
any of their assets is or was a party or by which Stel, any Subsidiary of Stel,
or any of their assets is bound.

     3.13 Insurance. Schedule 3.13 of the Stel Disclosure Statement lists all
insurance policies (including without limitation workers' compensation insurance
policies) covering the business, properties or assets of Stel and its
Subsidiaries, the premiums and coverages of such policies, and all claims in
excess of U.S. $50,000 made against any such policies since April 1, 1996. All
such policies are in effect, and true and complete copies of all such policies
have been made available to Newbridge. Stel has not received notice of the
cancellation or threat of cancellation of any of such policy.

     3.14 Contracts and Commitments.

          (a)  Except as filed as an exhibit to Stel's SEC Reports, neither Stel
nor its Subsidiaries is a party to or bound by any oral or written contract,
obligation or commitment of any type in any of the following categories:

               (i)    agreements or arrangements that contain severance pay,
understandings with respect to tax arrangements, understandings with respect to
expatriate benefits, or post-employment liabilities or obligations;

               (ii)   agreements or plans under which benefits will be increased
or accelerated by the occurrence of any of the transactions contemplated by this
Agreement, or the Stock Option Agreement or under which the value of the
benefits will be calculated on the basis of any of the transactions contemplated
by this Agreement or the Stock Option Agreement;

               (iii)  agreements, contracts or commitments currently in force
relating to the disposition or acquisition of material assets other than in the
ordinary course of business, or relating to an ownership interest in any
corporation, partnership, joint venture or other business enterprise;

               (iv)   agreements, contracts or commitments (A) relating to the
acquisition, transfer, development, sharing, license (to or by Stel), or use of
any Stel IP Right (except for any contract pursuant to which any Stel IP Right
is licensed to Stel

                                      16


under any third party software license generally available to the public), or
(B) with respect to the manufacturing, distribution or marketing of any products
of Stel;

               (v)    agreements, contracts or commitments for the purchase of
materials, supplies or equipment which provide for purchase prices substantially
greater than those presently prevailing for such materials, supplies or
equipment, or which are with sole or single source suppliers, other than those
which if terminated would not constitute a Material Adverse Effect;

               (vi)   guarantees or other agreements, contracts or commitments
under which Stel or any of its Subsidiaries is absolutely or contingently liable
for (A) the performance of any other person, firm or corporation (other than
Stel or its Subsidiaries), or (B) the whole or any part of the indebtedness or
liabilities of any other person, firm or corporation (other than Stel or its
Subsidiaries);

               (vii)  powers of attorney authorizing the incurrence of a
material obligation on the part of Stel or its Subsidiaries;

               (viii) agreements, contracts or commitments which limit or
restrict (A) where Stel or any of its Subsidiaries may conduct business, (B) the
type or lines of business (current or future) in which they may engage, or (C)
any acquisition of assets or stock (tangible or intangible) by Stel or any of
its Subsidiaries;

               (ix)   agreements, contracts or commitments containing any
agreement with respect to a change of control of Stel or any of its
Subsidiaries;

               (x)    agreements, contracts or commitments for the borrowing or
lending of money, or the availability of credit (except credit extended by Stel
or any of its Subsidiaries to customers in the ordinary course of business and
consistent with past practice); and

               (xi)   any hedging, option, derivative or other similar
transaction and any foreign exchange position or contract for the exchange of
currency;

         (b)   Neither Stel nor any of its Subsidiaries, nor to Stel's knowledge
any other party to a Stel Contract (as defined below), has breached, violated or
defaulted under, or received notice that it has breached, violated or defaulted
under, (nor does there exist any condition under which, with the passage of time
or the giving of notice or both, could reasonably be expected to cause such a
breach, violation or default under), any material agreement, contract or
commitment to which Stel or any of its Subsidiaries is a party or by which any
of them or any of their properties or assets may be bound (any such agreement,
contract or commitment, a "Stel Contract"), other than any breaches, violations
or defaults which individually or in the aggregate would not have a Stel
Material Adverse Effect.

                                      17


          (c)  Each Stel Contract is a valid, binding and enforceable obligation
of Stel and to Stel's knowledge, of the other party or parties thereto, in
accordance with its terms, and in full force and effect, except where the
failure to be valid, binding, enforceable and in full force and effect would not
have a Stel Material Adverse Effect and to the extent enforcement may be limited
by applicable bankruptcy, insolvency, moratorium or other laws affecting the
enforcement of creditors' rights governing or by general principles of equity.

          (d)  An accurate and complete copy of each Stel Contract has been made
available to Newbridge.

     3.15 Labor Matters; Employment and Labor Contracts.

          (a)  None of Stel or any of its Subsidiaries is a party to any union
contract or other collective bargaining agreement, nor to the knowledge of Stel
or any of its Subsidiaries are there any activities or proceedings of any labor
union to organize any of its employees. Each of Stel and its Subsidiaries is in
compliance with all applicable (i) laws, regulations and agreements respecting
employment and employment practices, (ii) terms and conditions of employment,
and (iii) occupational health and safety requirements, except for those failures
to comply which, individually or in the aggregate, would not have a Stel
Material Adverse Effect.

          (b)  There is no labor strike, slowdown or stoppage pending (or any
labor strike or stoppage threatened) against Stel or any of its Subsidiaries. No
petition for certification has been filed and is pending before the National
Labor Relations Board with respect to any employees of Stel or any of its
Subsidiaries who are not currently organized. Neither Stel nor any of its
Subsidiaries has any obligations under the Consolidated Omnibus Budget
Reconciliation Act of 1985, as amended ("COBRA"), with respect to any former
employees or qualifying beneficiaries thereunder, except for obligations that
would not have, individually or in the aggregate, a Stel Material Adverse
Effect. There are no controversies pending or, to the knowledge of Stel or any
of its Subsidiaries, threatened, between Stel or any of its Subsidiaries and any
of their respective employees, which controversies would have, individually or
in the aggregate, a Stel Material Adverse Effect.

          (c)  Neither Stel nor any of its Subsidiaries is a party to or bound
by any employment agreements or arrangements that are not terminable at will by
Stel or its Subsidiaries.

     3.16 Compliance with Laws. Neither Stel nor any of its Subsidiaries has
violated or failed to comply with any statute, law, ordinance, rule or
regulation (including without limitation relating to the export or import of
goods or technology) of any foreign, federal, state or local government or any
other governmental department or agency, except where any such violations or
failures to comply would not, individually or in the

                                      18


aggregate, have a Stel Material Adverse Effect. Stel and its Subsidiaries have
all permits, licenses and franchises from governmental agencies required to
conduct their businesses as now bei ng conducted and as proposed to be
conducted, except for those, the absence of which, would not, individually or in
the aggregate, have a Stel Material Adverse Effect.

     3.17 Government Contracts.

          (a)  For purposes of this Agreement:

               (i)    "Government Body" shall mean any: (A) nation, state,
commonwealth, province, territory, county, municipality, district or other
jurisdiction of any nature; (B) federal, state, local, municipal, foreign or
other government; or (C) governmental or quasi-governmental authority of any
nature (including any governmental division, department, agency, commission,
instrumentality, official, organization, unit, body or entity and any court or
other tribunal).

               (ii)   "Government Bid" shall mean any quotation, bid or proposal
submitted to any Government Body or any proposed prime contractor or higher-tier
subcontractor of any Government Body.

               (iii)  "Government Contract" shall mean any prime contract,
subcontract, letter contract, purchase order or delivery order executed or
submitted to or on behalf of any Government Body or any prime contractor or
higher-tier subcontractor, or under which any Government Body or any such prime
contractor or subcontractor otherwise has or may acquire any right or interest.

               (iv)   "Legal Requirement" shall mean any federal, state, local,
municipal, foreign or other law, statute, constitution, resolution, ordinance,
code, edict, decree, rule, regulation, ruling or requirement issued, enacted,
adopted, promulgated, implemented or otherwise put into effect by or under the
authority of any Government Body.

          (b)  Since April 1, 1996, except as set forth in Schedule 3.17 of the
Stel Disclosure Statement:

               (i)    neither Stel nor any Subsidiary has had any determination
of noncompliance, entered into any consent order or undertaken any internal
investigation relating directly or indirectly to any Government Contract or
Government Bid;

               (ii)   neither Stel nor any Subsidiary has failed to comply in
all material respects with all Legal Requirements with respect to all Government
Contracts and Government Bids;

                                      19


               (iii)  neither Stel nor any Subsidiary has, in obtaining or
performing any Government Contract, violated any applicable procurement law or
regulation or other material Legal Requirement;

               (iv)   all facts set forth in or acknowledged by Stel or any
Subsidiary in any certification, representation or disclosure statement
submitted by Stel or any Subsidiary with respect to any Government Contract or
Government Bid were current, accurate and complete as of the date of submission;

               (v)    neither Stel nor any Subsidiary has, nor to the best of
Stel's knowledge, have any of their respective employees been debarred or
suspended from doing business with any Government Body, nor have any proceedings
been initiated against Stel, any Subsidiary or, to the best of Stel's knowledge,
any employee of Stel or any Subsidiary that might result in such debarment or
suspension;

               (vi)   no negative determination of responsibility has been
issued against Stel or any Subsidiary in connection with any Government Contract
or Government Bid;

               (vii)  no direct or indirect costs incurred by Stel or any
Subsidiary have been questioned or disallowed as a result of a finding or
determination of any kind by any Government Body;

               (viii) no Government Body, or prime contractor or higher-tier
subcontractor of any Government Body, has withheld or set off, or threatened to
withhold or set off, any amount due to Stel or any Subsidiary under any
Government Contract;

               (ix)   there have been no material irregularities, misstatements
or omissions relating to any Government Contract or Government Bid that have led
to or have a reasonable prospect of leading to (A) any administrative, civil,
criminal or other investigation, legal proceeding or indictment involving Stel,
any Subsidiary or any of their employees, (B) the questioning or disallowance of
any costs submitted for payment by Stel or any Subsidiary, (C) the recoupment of
any payments previously made to Stel or any Subsidiary, (D) a finding or claim
of fraud, defective pricing, mischarging or improper payments on the part of
Stel or any Subsidiary, or (E) the assessment of any penalties or damages of any
kind against Stel or any Subsidiary;

               (x)    there are not nor have there been any (A) outstanding
claims against Stel or any Subsidiary by, or dispute involving Stel or any
Subsidiary with, any prime contractor, subcontractor, vendor or other Person
arising under or relating to the award or performance of any Government
Contract, (B) facts known by Stel upon which any such claim may be based or
which may give rise to any such dispute, (C) final decisions of any Government
Body against Stel or any Subsidiary;

                                      20


               (xi)   neither Stel nor any Subsidiary is undergoing, or has
undergone an audit, and Stel has no knowledge of any impending audit, arising
under or relating to any Government Contract (other than normal routine audits
conducted in the ordinary course of business);

               (xii)  neither Stel nor any Subsidiary has entered into any
financing arrangement or assignment of proceeds with respect to the performance
of any Government Contract;

               (xiii) no payment has been made by Stel or any Subsidiary or by
any Person acting on Stel's or any Subsidiary's behalf to any Person (other than
to any bona fide employee or agent of Stel or any Subsidiary) which is or was
contingent upon the award of any Government Contract or which would otherwise be
in violation of any applicable procurement law or regulation or any other Legal
Requirement;

               (xiv)  Stel's and each of its Subsidiaries cost accounting system
is in material compliance with applicable regulations and other applicable Legal
Requirements, and has not has been determined by any Government Body not to be
in material compliance with any Legal Requirement;

               (xv)   to the best of Stel's knowledge, Stel and its Subsidiaries
have complied with all applicable regulations and other Legal Requirements and
with all applicable contractual requirements relating to the placement of
legends or restrictive markings on technical data, computer software and other
intellectual property;

               (xvi)  neither Stel nor any Subsidiary has made any disclosure to
any Government Body pursuant to any formal agency disclosure program;

               (xvii)  Stel and its Subsidiaries have reached agreement with the
cognizant government representatives approving and "closing" all indirect costs
charged to Government Contracts;

               (xviii)the responsible government representatives have agreed
with Stel and each Subsidiary on the "forward pricing rates" that Stel or such
Subsidiary is charging on cost-type Government Contracts and including in
Government Bids; and

               (xix)  with the exception of potential novation or change-of-name
agreement that may be required by a Government Body under applicable Legal
Requirements, neither Stel nor any Subsidiary is or will be required to make any
filing with or give any notice to, or to obtain any consent from, any Government
Body under or in connection with any Government Contract or Government Bid as a
result of or by virtue of (A) the execution, delivery or performance of this
Agreement or any of the other agreements referred to in this Agreement, or (B)
the consummation of the transactions

                                      21


contemplated by this Agreement, the Stock Option Agreement and the Technology
Option Agreement.

     3.18 Intellectual Property Rights.

          (a)  Stel and its Subsidiaries own or have the right to use all
intellectual property used in or necessary to conduct their respective
businesses (such intellectual property and the rights thereto are collectively
referred to herein as the "Stel IP Rights").

          (b)  Schedule 3.18 of Stel Disclosure Statement sets forth, with
respect to all Stel IP Rights registered with any Government Body or for which
an application has been filed with any Government Body, (i) a brief description
of such Stel IP Rights, and (ii) the names of the jurisdictions covered by the
applicable registration or application. Schedule 3.18 of Stel Disclosure
Statement identifies and provides a brief description of, and identifies any
ongoing royalty or payment obligations with respect to, each Stel IP Right that
is licensed or otherwise made available to Stel by any Person (except for any
Stel IP Right that is licensed to Stel under any third party software license
generally available to the public), and identifies the agreement under which
such Stel IP Right is being licensed or otherwise made available to Stel. Stel
has good, valid and marketable title to all of Stel IP Rights (except for
licensed rights), free and clear of all encumbrances, except (i) as set forth in
Schedule 3.18 of the Stel Disclosure Statement, (ii) for any lien for current
taxes not yet due and payable, and (iii) for minor liens that have arisen in the
ordinary course of business and that do not (individually or in the aggregate)
materially detract from the value of the rights subject thereto or materially
impair the operations of Stel. To Stel's knowledge, Stel has a valid right to
use, license and otherwise exploit all Stel IP Rights. Except as set forth in
Schedule 3.18 of Stel Disclosure Statement, Stel has not developed jointly or
does not jointly own or have joint rights with any other Person any Stel IP
Right that is material to the business of Stel. Except as set forth in Schedule
3.18 of the Stel Disclosure Statement, there is no agreement or arrangement
pursuant to which any Person has any right (whether or not currently
exercisable) to use, license or otherwise exploit any Stel IP Rights

          (c)  Stel has taken all commercially reasonable measures and
precautions to protect and maintain the confidentiality and secrecy of all Stel
IP Rights (except Stel IP Rights whose value would be unimpaired by public
disclosure) and otherwise to maintain and protect the value of all Stel IP
Rights.

          (d)  To the knowledge of Stel, Stel is not misappropriating or making
any unlawful use of, and Stel has not at any time misappropriated or made any
unlawful use, of, or received any notice or other communication (in writing or
otherwise) of any actual, alleged, possible or potential infringement,
misappropriation or unlawful use of, any intellectual property rights owned or
used by any other Person.  Stel is not aware that any Person is
misappropriating, or making unlawful use of any of the Stel IP Rights.

                                      22


          (e)  Stel has not licensed any of the Stel IP Rights to any Person on
an exclusive basis.

          (f)  The execution, delivery and performance of this Agreement, the
Stock Option Agreement or the Technology Option Agreement and the consummation
of the transactions contemplated hereby will not constitute a material breach of
any instrument or agreement governing any Stel IP Rights, and will not (i) cause
the modification of any terms of any licenses or agreements relating to any Stel
IP Rights, (ii) cause the forfeiture or termination of any Stel IP Rights, (iii)
give rise to a right of forfeiture or termination of any Stel IP Rights or (iv)
materially impair the right of Stel, the Surviving Corporation or Newbridge to
use, sell or license any Stel IP Rights or portion thereof.

          (g)  Neither the manufacture, marketing, license, sale nor intended
use of any product or technology currently licensed or sold or under development
by Stel or any of its Subsidiaries (i) violates in any material respect any
license or agreement between Stel or any of its Subsidiaries and any third party
or (ii) infringes in any material respect any patents or other intellectual
property rights of any other party; and there is no pending or threatened claim
or litigation contesting the validity, ownership or right to use, sell, license
or dispose of any Stel IP Rights, or asserting that any Stel IP Rights or the
proposed use, sale, license or disposition thereof, or the manufacture, use or
sale of any Stel products, conflicts or will conflict with the rights of any
other party.

          (h)  Stel has provided to Newbridge a true and complete copy of its
standard form of employee confidentiality agreement and taken all commercially
reasonably necessary steps to ensure that all employees have executed such an
agreement. All consultants or third parties with access to proprietary
information of Stel have executed appropriate non-disclosure agreements which
adequately protect the Stel IP Rights.

          (i)  Neither Stel nor any of its Subsidiaries is aware or has reason
to believe that any of its employees or consultants is obligated under any
contract, covenant or other agreement or commitment of any nature, or subject to
any judgment, decree or order of any court or administrative agency, that would
interfere with the use of such employee's or consultant's best efforts to
promote the interests of Stel and its Subsidiaries or that would conflict with
the business of Stel as presently conducted or proposed to be conducted. Neither
Stel nor any of its Subsidiaries has entered into any agreement to indemnify any
other person, including but not limited to any employee or consultant of Stel or
any of its Subsidiaries, against any charge of infringement, misappropriation or
misuse of any intellectual property, other than indemnification provisions
contained in purchase orders or customer agreements arising in the ordinary
course of business. All current and former employees of Stel or any of its
Subsidiaries, and all current and former consultants of Stel or any of its
Subsidiaries who have provided services related to Stel IP

                                      23


Rights, have signed valid and enforceable written assignments to Stel or its
Subsidiaries of any and all rights or claims in any intellectual property that
any such employee or consultant has or may have by reason of any contribution,
participation or other role in the development, conception, creation, reduction
to practice or authorship of any invention, innovation, development or work of
authorship or any other intellectual property that is used in the business of
Stel, and Stel and its Subsidiaries possess signed copies of all such written
assignments by such employees and consultants.

     3.19 Accounts Receivable; Inventories.

          (a)  Except as set forth in the Stel Balance Sheet, (i) each account
receivable of Stel and its Subsidiaries (the "Accounts Receivable") represents a
sale made in the ordinary course of business and which arose pursuant to an
enforceable contract for a bona fide sale of goods or for services performed,
and Stel and its Subsidiaries have performed all of their obligations to produce
the goods or perform the services to which such Accounts Receivable relate,
other than amounts recorded as deferred revenue, and (ii) no Account Receivable
is subject to any claim for reduction, counterclaim, set-off, recoupment or
other claim for credit, allowances or adjustment by the obligor thereof.

          (b)  Subject to amounts reserved therefor on the Stel Balance Sheet,
the values at which all inventories are carried on the Stel Balance Sheet
reflect the historical inventory valuation policy of Stel and its Subsidiaries
set forth in the Stel SEC Reports. Stel and its Subsidiaries have good and
marketable title to the inventories free and clear of all liens and
encumbrances. The inventories do not consist of, in any material amount, items
that are obsolete, damaged or slow-moving beyond amounts reserved on the Stel
Balance Sheet. The inventories do not consist of any items held on consignment.
Neither Stel nor any of its Subsidiaries is under any obligation or liability
with respect to accepting returns of items of inventory or merchandise in the
possession of their customers other than in the ordinary course of business and
consistent with past practice. No clearance or extraordinary sale of the
inventories has been conducted since the Stel Reference Date. Subject to the
amounts reserved therefor on the Stel Balance Sheet, the inventories are in good
and merchantable condition in all material respects, are suitable and usable for
the purposes for which they are intended and are in a condition such that they
can be sold in the ordinary course of business consistent with past practice.

     3.20 Order Backlog. Schedule 3.20 of the Stel Disclosure Statement contains
a list of the aggregate orders for the products of Stel and its Subsidiaries as
of the Stel Reference Date and as of April 30, 1999, and identifies each
customer included in the backlog and the range of products and prices by
customer constituting the backlog. Except as set forth on Schedule 3.20, all
such orders have been included in backlog on a basis consistent with Stel's
historical practices and Stel is not aware of any customer who has placed an
order included in such backlog having refused or who intends to refuse delivery
of any ordered products in accordance with the terms of such orders.

                                      24


     3.21 Product and Service Warranties. The standard written forms of product
and service warranties and guarantees utilized by Stel and its Subsidiaries as
of the date of this Agreement have been provided to Newbridge. Except as set
forth on Schedule 3.21 of the Stel Disclosure Statement, during a period of
three years prior to the date of this Agreement, neither Stel nor any Subsidiary
or any of their affiliates have made any other written material warranties
(which remain in effect) with regard to products and/or services supplied by
Stel or its Subsidiaries.

     3.22 Taxes.

          (a)  For the purposes of this Agreement, a "Tax" or, collectively,
"Taxes," means (i) any and all federal, state, local, foreign and other taxes,
assessments and other governmental charges, duties, impositions and liabilities,
including taxes based upon or measured by gross receipts, income, profits,
sales, use and occupation, and value added, ad valorem, transfer, gains,
franchise, capital stock, severance, withholding, payroll, recapture,
employment, excise, unemployment insurance, social security, business license,
occupation, business organization, stamp, environmental and property taxes,
together with all interest, penalties and additions imposed with respect to such
amounts; (ii) any liability for the payment of any amounts described in clause
(i) as a result of being a successor to or transferee of any individual or
entity or a member of an affiliated, consolidated or unitary group for any
period (including pursuant to Treas. Reg. (S) 1.1502-6 or comparable provisions
of state, local or foreign tax law); and (iii) any liability for the payment of
amounts described in clause (i) or clause (ii) as a result of any express or
implied obligation to indemnify any Person or as a result of any obligations
under agreements or arrangements with any Person.

          (b)  (i)    Stel and each of its Subsidiaries have filed all material
returns, estimates, information statements and reports relating to Taxes
("Returns") required to be filed by them prior to Closing, and such Returns are
true and correct and completed in accordance with applicable law. Schedule 3.22
of the Stel Disclosure Statement lists all jurisdictions in which Returns are
required to be filed by Stel and its Subsidiaries (or have been required since
April 1, 1996 of the Stel) and the types of Returns required to be filed in each
such jurisdiction.

               (ii)   Stel and each of its Subsidiaries have (A) timely paid all
Taxes due and payable by them as shown on the Returns, (B) timely paid all Taxes
for which a notice of assessment or collection has been received (other than
amounts properly accrued on the Stel Financial Statements, described in
paragraph (iii), below, and being contested in good faith by appropriate
proceedings), (C) accrued on the Stel Financial Statements all Taxes
attributable to periods covered by such statements that are not yet due and
payable, and (D) properly reserved, in accordance with GAAP, for all Taxes not
yet due but which are expected to become due and payable in the future.

                                      25


               (iii)  Neither the Internal Revenue Service (the "IRS") nor any
other taxing authority has asserted any claim for Taxes in writing, or to the
actual knowledge of the executive officers of Stel, is threatening to assert any
claims for Taxes. No Tax deficiency notice or notice of assessment of collection
has been received in writing by Stel except as described on Schedule 3.22 of the
Stel Disclosure Statement. No audit or, to Stel's knowledge, other examination
of any Return of Stel or any of its Subsidiaries is presently in progress, nor
have Stel or any of its Subsidiaries been notified in writing of any request for
such an audit or other examination. No power of attorney to deal with Tax
matters or waiver of any statute of limitations with respect to Taxes has been
granted by Stel or its Subsidiaries. Except as described on Schedule 3.22 of the
Stel Disclosure Statement the relevant statute of limitations for the assessment
or proposal of a deficiency for Taxes has expired for all years before fiscal
year 1995. None of Stel or its Subsidiaries has availed itself of any Tax
Amnesty, tax holiday or similar relief in any jurisdiction.

               (iv)   Stel and its Subsidiaries have withheld or collected and
paid over to the appropriate governmental authorities (or are properly holding
for such payment) all Taxes required by law to be withheld or collected with
respect to their operations, including withholdings on payments to Stel or its
Subsidiaries for sales and use taxes or payments by Stel or its Subsidiaries to
employees or independent contractors on account of federal, state, and foreign
income Taxes, the Federal Insurance Contribution Act, and the Federal
Unemployment Tax Act.

               (v)    There are no liens for Taxes upon the assets of Stel or
any of its Subsidiaries (other than liens for property Taxes that are not yet
due or delinquent).

               (vi)   There is no contract, agreement, plan or arrangement,
including but not limited to the provisions of this Agreement, covering any
employee or former employee of Stel or any of its Subsidiaries that,
individually or collectively, could give rise to the payment of any amount that
would not be deductible pursuant to Sections 280G, 404 or 162 of the Code.

               (vii)  None of Stel nor any of its Subsidiaries has filed any
consent agreement under Section 341(f) of the Code or agreed to have Section
341(f)(2) of the Code apply to any disposition of a subsection (f) asset (as
defined in Section 341(f)(4) of the Code) owned by Stel.

               (viii) Neither Stel nor any of its Subsidiaries is or has been a
member of an affiliated group of corporations filing a consolidated federal
income tax return (or a group of corporations filing a consolidated, combined or
unitary income tax return under comparable provisions of state, local or foreign
tax law) other than a group the common parent of which is or was Stel.

                                      26


               (ix)   Neither Stel nor any of its Subsidiaries has any
obligation under any agreement or arrangement with any other Person with respect
to Taxes of such other Person (including pursuant to Treas. Reg. (S) 1.1502-6 or
comparable provisions of state, local or foreign tax law) and including any
liability for Taxes of any predecessor entity.

               (x)    Stel has made available to Newbridge true copies of all
Returns that Stel or its Subsidiaries have filed since April 1, 1996 and true
copies of all correspondence and other written submissions to or communications
with any Tax authorities.

               (xi)   None of the assets of Stel is "tax-exempt use property"
within the meaning of Section 168(h) of the Code.

               (xii)  Stel has not agreed to make, nor is it required to make,
any adjustment under Section 481 of the Code by reason of a change in accounting
method or otherwise.

               (xiii) Except as set forth in Schedule 3.22 of the Disclosure
Statement, Stel is not and has not been a party to any joint venture,
partnership, or other arrangement or contract that could be treated as a
partnership for federal income tax purposes.

               (xiv)  None of Stel nor any of its Subsidiaries has indemnified
any person against Tax in connection with any arrangement for the leasing of
real or personal property, except for indemnity with respect to acts of Stel or
its Subsidiaries.

               (xv)   None of Stel and its Subsidiaries has or has had
operations or assets outside of the United States taxable as a "branch" by the
United States or as a "permanent establishment" by any foreign country.

               (xvi)  None of Stel and its Subsidiaries is aware of any reason
why the Merger will fail to qualify as a reorganization under the provisions of
Section 368(a) of the Code.

     3.23 Employee Benefit Plans; ERISA.

          (a)  Except as set forth on Schedule 3.23 of the Stel Disclosure
Statement, there are no "employee pension benefit plans" as defined in Section
3(2) of the Employee Retirement Income Security Act of 1974, as amended
("ERISA") ("Pension Plans"), "welfare benefit plans" as defined in Section 3(1)
of ERISA ("Welfare Plans"), or stock bonus, stock option, restricted stock,
stock appreciation right, stock purchase, bonus, incentive, deferred
compensation, severance, holiday, or vacation plans, or any other employee
benefit plan, program, policy or arrangement covering employees (or

                                      27


former employees) employed in the United States that either is maintained or
contributed to by Stel or any of its Subsidiaries or any of their ERISA
Affiliates (as hereinafter defined) or to which Stel or any of its Subsidiaries
or any of their ERISA Affiliates is obligated to make payments or otherwise may
have any liability (collectively, the "Employee Benefit Plans") with respect to
employees or former employees of Stel, its Subsidiaries, or any of their ERISA
Affiliates. For purposes of this Agreement, "ERISA Affiliate" shall mean any
person (as defined in Section 3(9) of ERISA) that is or has been a member of any
group of persons described in Section 414(b), (c), (m) or (o) of the Code,
including without limitation Stel or a Subsidiary.

          (b)  Stel and each of its Subsidiaries, and each of the Pension Plans
and Welfare Plans, are in compliance with the applicable provisions of ERISA,
the Code and other applicable laws, except where the failure to comply would
not, individually or in the aggregate, have a Stel Material Adverse Effect.

          (c)  All contributions to, and payments from, the Pension Plans which
are required to have been made in accordance with the Pension Plans have been
timely made, except where the failure to make such contributions or payments on
a timely basis would not, individually or in the aggregate, have a Stel Material
Adverse Effect.

          (d)  All of Stel's Pension Plans intended to qualify under Section 401
of the Code have been determined by the Internal Revenue Service ("IRS") to be
so qualified, and no event has occurred and no condition exists with respect to
the form or operation of such Pension Plans which would cause the loss of such
qualification or exemption or the imposition of any material liability, penalty
or tax under ERISA or the Code.

          (e)  To the best of Stel's knowledge, there are no (i) investigations
pending by any Government Entity involving the Pension Plans or Welfare Plans,
nor (ii) pending or threatened claims (other than routine claims for benefits),
suits or proceedings against any Pension or Welfare Plan, against the assets of
any of the trusts under any Pension or Welfare Plan or against any fiduciary of
any Pension or Welfare Plan with respect to the operation of such plan or
asserting any rights or claims to benefits under any Pension Plan or against the
assets of any trust under such plan, except for those which would not,
individually or in the aggregate, give rise to any liability which would have a
Stel Material Adverse Effect. To the best of Stel's knowledge, there are no
facts which would give rise to any liability under this Section 3.24(e) except
for those which would not, individually or in the aggregate, have a Stel
Material Adverse Effect in the event of any such investigation, claim, suit or
proceeding.

          (f)  None of Stel, any of its Subsidiaries or any employee of the
foregoing, nor any trustee, administrator, other fiduciary or any other "party
in interest" or "disqualified person" with respect to the Pension Plans or
Welfare Plans, has engaged in a "prohibited transaction" (as such term is
defined in Section 4975 of the Code or

                                      28


Section 406 of ERISA), other than such transactions that would not, individually
or in the aggregate, have a Stel Material Adverse Effect.

          (g)  None of Stel, any of its Subsidiaries, or any of their ERISA
Affiliates maintain or contribute to, nor have they ever maintained or
contributed to, any pension plan subject to Title IV of ERISA or Section 412 of
the Code or Section 302 of ERISA.

          (h)  Neither Stel nor any Subsidiary of Stel nor any ERISA Affiliate
has incurred any material liability under Title IV of ERISA that has not been
satisfied in full.

          (i)  Neither Stel, any of its Subsidiaries nor any of their ERISA
Affiliates has any material liability (including any contingent liability under
Section 4204 of ERISA) with respect to any multiemployer plan, within the
meaning of Section 3(37) of ERISA, covering employees (or former employees)
employed in the United States.

          (j)  With respect to each of the Employee Benefit Plans, true, correct
and complete copies of the following documents have been made available to
Newbridge: (i) the plan document and any related trust agreement, including
amendments thereto, (ii) any current summary plan descriptions and other
material communications to participants relating to the Employee Benefit Plans,
(iii) the three most recent Forms 5500, if applicable, and (iv) the most recent
IRS determination letter, if applicable.

          (k)  None of the Welfare Plans maintained by Stel or any of its
Subsidiaries provides for continuing benefits or coverage for any participant or
any beneficiary of a participant following termination of employment, except as
may be required under COBRA, or except at the expense of the participant or the
participant's beneficiary. Stel and each of its Subsidiaries which maintain a
"group health plan" within the meaning of Section 5000(b)(1) of the Code have
complied with the notice and continuation requirements of Section 4980B of the
Code, COBRA, Part 6 of Subtitle B of Title I of ERISA and the regulations
thereunder, except where the failure to comply would not, individually or in the
aggregate, have a Stel Material Adverse Effect.

          (l)  No liability under any Pension Plan or Welfare Plan has been
funded nor has any such obligation been satisfied with the purchase of a
contract from an insurance company as to which Stel or any of its Subsidiaries
has received notice that such insurance company is in rehabilitation or a
comparable proceeding.

          (m)  The consummation of the transactions contemplated by this
Agreement will not result in an increase in the amount of compensation or
benefits or accelerate the vesting or timing of payment of any benefits or
compensation payable to or in respect of any employee of Stel or any of its
Subsidiaries under any Employee Benefit Plan.

                                      29


          (n)  Schedule 3.23(n) of the Stel Disclosure Statement lists each
Foreign Plan (as hereinafter defined). Stel and each of its Subsidiaries and
each of the Foreign Plans are in compliance with applicable laws, and all
required contributions have been made to the Foreign Plans, except where the
failure to comply or make contributions would not, individually or in the
aggregate, have a Stel Material Adverse Effect. Each of the Foreign Plans that
is a funded defined benefit plan has a fair market value of plan assets that is
greater than the plan's liabilities, as determined in accordance with applicable
laws. For purposes hereof, the term "Foreign Plan" shall mean any plan, program,
policy, arrangement or agreement maintained or contributed to by, or entered
into with, Stel or any Subsidiary with respect to employees (or former
employees) employed outside the United States to the extent the benefits
provided thereunder are not mandated by the laws of the applicable foreign
jurisdiction.

          (o)  To the best of Stel's knowledge, there are no claims, suits or
facts concerning the operation or benefits of any Employee Benefit Plan other
than a Pension or Welfare Plan except for those which would not, individually or
in the aggregate, give rise to any liability which would have a Stel Material
Adverse Effect.

          (p)  Each of the Employee Benefit Plans and the Foreign Plans can be
terminated by Stel within a period of 30 days following the Effective Time in
accordance with the terms of such Plan (and the provisions of ERISA and the
Code), without any additional contribution to such Employee Benefit Plan or
Foreign Plan or the payment of any additional compensation or amount or the
additional vesting or acceleration of any vesting provided under the Employee
Benefit Plan or Foreign Plan.

     3.24 Environmental Matters.

          (a)  For purposes of this Agreement:

               (i)    "Contractor" shall mean any person or entity, including
but not limited to partners, licensors, and licensees, with which Stel formerly
or presently has any agreement or arrangement (whether oral or written) under
which such person or entity has or had physical possession of, and was or is
obligated to develop, test, process, manufacture or produce any product or
substance on behalf of Stel.

               (ii)   "Environment" shall mean any land including, without
limitation, surface land and sub-surface strata, seabed or river bed and any
water (including, without limitation, coastal and inland waters, surface waters
and ground waters and water in drains and sewers) and air (including, without
limitation, air within buildings) and other natural or manmade structures above
or below ground.

               (iii)  "Environmental Law" means any law or regulation, now or
hereafter in effect and as amended, and any judicial or administrative
interpretation thereof, in each case relating to the Environment or harm to or
the protection of human

                                      30


health or animals or plants, including, without limitation, laws relating to
public and workers health and safety, emissions, discharges or releases of
chemicals or any other pollutants or contaminants or industrial, radioactive,
dangerous, toxic or hazardous substances or wastes (whether in solid or liquid
form or in the form of a gas or vapor and including noise and genetically
modified organisms) into the Environment or otherwise relating to the
manufacture, processing, use, treatment, storage, distribution, disposal
transport or handling of substances or wastes. Environmental Laws include,
without limitation, the Comprehensive Environmental Response, Compensation and
Liability Act, as amended 42 USC 9601 et seq. ("CERCLA"), the Resource
Conservation and Recovery Act 42 USC, 6901 et seq., the Hazardous Materials
Transportation Act 49 USC, 6901 et seq., the Clean Water Act 33, 1251 et seq.,
the Toxic Substances Control Act 15 USC, 2601 et seq., the Clean Air Act 42 USC,
7401 et seq., the Safe Drinking Water Act 42 USC, 300f et seq., the Atomic
Energy Act 42 USC, 2201 et seq., the Federal Food Drug and Cosmetic Act 21 USC,
136 et seq., and the Federal Food Drug and Cosmetic Act 21 USC, 301 et seq., and
equivalent state and local ordinances and statutes, and statutes and ordinances
in countries other than the United States of America.

               (iv)   "Environmental Permit" shall mean any permit, license,
consent, approval, certificate, qualification, specification, registration and
other authorization, and the filing of all notifications, reports and
assessments, required by any federal, state, local or foreign government or
regulatory entity pursuant to any Environmental Law.

               (v)    "Hazardous Material" shall mean any pollutant,
contaminant, or hazardous, toxic, medical, biohazardous, infectious or dangerous
waste, substance, gas, constituent or material, defined or regulated as such in,
or for purposes of, any Environmental Law, including, without limitation, any
asbestos, any petroleum, oil (including crude oil or any fraction thereof), any
radioactive substance, any polychlorinated biphenyls, any toxin, chemical,
virus, infectious disease or disease causing agent, and any other substance that
can give rise to liability under any Environmental Law.

          (b)  Except for such cases that, individually or in the aggregate,
have not and would not reasonably be expected to have a Stel Material Adverse
Effect:

               (i)    Each of Stel and its Subsidiaries possesses all
Environmental Permits required under applicable Environmental Laws to conduct
its current business and to use and occupy the Real Property for its current
business. All Environmental Permits are in full force and effect and Stel and
each of its Subsidiaries are, and to Stel's knowledge have, at all times been in
compliance with the terms and conditions of such Environmental Permits.

               (ii)    There are no facts or circumstances indicating that any
Environmental Permits possessed by Stel or any of its Subsidiaries would or
might be

                                      31


revoked, suspended, canceled or not renewed, and all appropriate necessary
action in connection with the renewal or extension of any Environmental Permits
possessed by Stel or any of its Subsidiaries relating to their current business
and the Real Property has been taken.

               (iii)  The execution and delivery of this Agreement and the Stock
Option Agreement and the consummation by Stel of the Merger and other
transactions contemplated hereby (and thereby) and the exercise by Newbridge and
the Surviving Corporation of rights to own and operate the business of Stel and
its Subsidiaries and use and occupy the Real Property and carry on its business
substantially as presently conducted will not affect the validity or require the
transfer of any Environmental Permits held by Stel or any of its Subsidiaries
and will not require any notification, disclosure, registration, reporting,
filing, investigation or remediation under any Environmental Law.

               (iv)   Stel and each of its Subsidiaries and, to the knowledge of
Stel, all previous owners, lessees and occupants of the real property now or
previously owned, leased or occupied by Stel and its Subsidiaries (the "Real
Property"), are in compliance with, and within the period of all applicable
statutes of limitation, have complied with all applicable Environmental Laws and
have not received notice of any liability under any Environmental Law; and
neither Stel or any of its Subsidiaries nor any portion of the Real Property is
in violation of any Environmental Law.

               (v)    There is no civil, criminal or administrative action,
suit, demand, claim, complaint, hearing, notice of violation, notice or demand
letter, proceeding or request for information pending or any liability (whether
actual or contingent) to make good, repair, reinstate, sample, investigate or
clean up any of the Real Property, including but not limited to ground water
beneath such Real Property. There is no act, omission, event or circumstance
giving rise or likely to give rise in the future to any such action, suit,
demand, claim, complaint, hearing, notice of violation, notice or demand letter,
proceeding, or request or any such liability or other liabilities (A) against
Stel or any of its Subsidiaries, or (B) against any person or entity, including
but not limited to any Contractor, in connection with which liability could
reasonably be imputed or attributed by law or contract to Stel or any of its
Subsidiaries.

               (vi)   No property or facility presently or formerly owned
operated or leased by Stel or any of its present or former Subsidiaries or by
any respective predecessor in interest is listed or proposed for listing, nor
are there are any facts or circumstances which would or might give rise to such
an entry on the National Priorities List or the CERCLA Information System
("CERCLIS"), both under the CERCLA or on any comparable list established under
any state or local Environmental Law of a country other than the United States
of America, nor has Stel or any of its Subsidiaries received any notification of
potential or actual liability or any request for information under CERCLA or any
comparable foreign, state or local law.

                                      32


               (vii)  There has not been any disposal, spill, discharge, or
release of any Hazardous Material generated, used, owned, stored, or controlled
by Stel, any of its Subsidiaries, or respective predecessors in interest, on,
at, or under any property presently or formerly owned, leased, or operated by
Stel, its Subsidiaries, any predecessor in interest, or any Contractor, and
there are no Hazardous Materials located in, at, on, or under, or in the
vicinity of, any such facility or property, or at any other location, in either
case that could reasonably be expected to require investigation, removal,
remedial, or corrective action by Stel or any of its Subsidiaries or that would
reasonably likely result in liability of, or costs in excess of, U.S. $250,000,
individually or in the aggregate, to Stel or any of its Subsidiaries under any
Environmental Law.

               (viii) (A) Other than cleaning and office supplies normally used
in the operation of an office, Hazardous Materials have not been generated,
used, treated, handled or stored on, or transported to or from, or released on
any Real Property or, any property adjoining any Real Property; (B) Stel and its
Subsidiaries have disposed of all wastes, including those wastes containing
Hazardous Materials, in compliance with all applicable Environmental Law and
Environmental Permits; and (C) neither Stel nor any of its Subsidiaries has
transported or arranged for the transportation of any Hazardous materials to any
location that is listed or proposed for listing on the National Priorities List
under CERCLA or on the CERCLIS or any analogous state or country list or which
is the subject of any environmental claim.

               (ix)   There has not been any underground or aboveground storage
tank or other underground storage receptacle or related piping, or any
impoundment or other disposal area containing Hazardous Materials located on any
Real Property owned, leased or operated by Stel, any of its Subsidiaries, or
respective predecessors in interest during the period of such ownership, lease
or operation, and no asbestos or polychlorinated biphenyls have been used or
disposed of, or have been located at, on, or under any such facility or property
during the period of such ownership lease or operation;

               (x)    Stel and its Subsidiaries have taken all actions necessary
under applicable requirements of Environmental Law to register any products or
materials required to be registered by Stel or any of its Subsidiaries (or any
of their respective agents) thereunder.

          (c)  After a reasonable investigation made by Stel, Stel has made
available to Newbridge all records and files, including, but not limited to, all
assessments, reports, studies, audits, analyses, tests and data in possession of
Stel and its Subsidiaries concerning the existence of Hazardous Materials at
facilities or properties currently or formerly owned, operated, or leased by
Stel or any present or former Subsidiary or predecessor in interest, or
concerning compliance by Stel and its Subsidiaries with, or liability under, any
Environmental Law.

                                      33


     3.25 Officer's Certificate as to Tax Matters.  Stel knows of no reason why
it will be unable to deliver to Heller Ehrman White & McAuliffe and Thelen Reid
& Priest LLP at the Closing an Officer's Certificate in form sufficient to
enable each such counsel to render the opinions required by Section 7.2(d).

     3.26 Affiliates.  Stel has delivered to Newbridge in accordance with
Section 5.9 a list identifying all persons who to Stel's knowledge may be deemed
to be "affiliates" of Stel for purposes of Rule 145 under the Securities Act
("Affiliates").

     3.27 Finders or Brokers.  Except for Ferris, Baker Watts, Incorporated,
whose fees have been disclosed to Newbridge, neither Stel nor any of its
Subsidiaries has employed any investment banker, broker, finder or intermediary
in connection with the transactions contemplated hereby who might be entitled to
a fee or any commission the receipt of which is conditioned upon consummation of
the Merger.

     3.28 Registration Statement; Proxy Statement/Prospectus. The information
supplied by Stel for inclusion or incorporation by reference in the Registration
Statement (as defined herein) as it relates to Stel, at the time the
Registration Statement is declared effective by the SEC shall not contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary in order to make the statements therein not
misleading. The information supplied by Stel for inclusion in the proxy
statement/prospectus to be sent to the stockholders of Stel in connection with
the Stel Special Meeting (such proxy statement/prospectus, as amended and
supplemented is referred to herein as the "Proxy Statement/Prospectus"), at the
date the Proxy Statement/Prospectus is first mailed to stockholders, at the time
of the Stel Special Meeting and at the Effective Time shall not contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary in order to make the statements therein, in
light of the circumstances under which they were made, not misleading. If at any
time prior to the Effective Time any event with respect to Stel or any of its
Subsidiaries shall occur which is required to be described in the Proxy
Statement/Prospectus, such event shall be so described, and an amendment or
supplement shall be promptly filed with the SEC and, as required by law,
disseminated to the stockholders of Stel.

     3.29 Title to Property.  Stel and its Subsidiaries have good and valid
title to all of their respective properties, interests in properties and assets,
real and personal, reflected in the Stel Balance Sheet or acquired after the
Reference Date, and have valid leasehold interests in all leased properties and
assets, in each case free and clear of all mortgages, liens, pledges, charges or
encumbrances of any kind or character, except (i) liens for current taxes not
yet due and payable, (ii) such imperfections of title, liens and easements as do
not and will not materially detract from or interfere with the use of the
properties subject thereto or affected thereby, or otherwise materially impair
business operations involving such properties, (iii) liens securing debt
reflected on the Stel Balance Sheet, (iv)

                                      34


liens recorded pursuant to any Environmental Law or (v) liens which would not,
individually or in the aggregate, have a Stel Material Adverse Effect. Schedule
3.29 of the Stel Disclosure Statement identifies each parcel of real property
owned or leased by Stel or any of its Subsidiaries.

     3.30 Year 2000 Compliance. All of Stel's products (including products sold
to date, products currently being sold or products under development), both
individually and when operating in conjunction with all other systems or
products with which they are designed to interface, and all computer software
and hardware (including microcode, firmware, system and application programs,
files, databases, computer services, and microcontrollers, including those
embedded in computer and noncomputer equipment) contained in Stel's products
(including products sold to date, products currently being sold or products
under development) are Year 2000 Compliant. "Year 2000 Compliant" means that
such hardware or software will: (a) process date data from at least the years
1900 through 2101 without error or interruption; (b) maintain functionality with
respect to the introduction, processing, or output of records containing dates
falling on or after January 1, 2000; and (c) be interoperable with other
software or hardware which may deliver records to, receive records from, or
interact with such hardware or software in the course of conducting the business
of Stel, including processing data and manufacturing the products of Stel. All
of Stel's internal computer systems are, both individually and in conjunction
with all other systems with which they interface, Year 2000 Compliant. Stel has
made inquiries of its manufacturers, suppliers and customers and, to its
knowledge, Stel is not relying on any third party whose systems are not Year
2000 Compliant. Stel does not have any material expenses or other material
liabilities associated with securing Year 2000 Compliance, or making contingency
arrangements to address Year 2000 Compliance issues, with respect to Stel's
products (including products sold to date, products currently being sold or
products under development), internal computer systems or the computer systems
or products or services of Stel's manufacturers, suppliers or customers.

                          ARTICLE IV
           REPRESENTATIONS AND WARRANTIES OF NEWBRIDGE AND MERGER SUB

     Newbridge and Merger Sub make to Stel the representations and warranties
contained in this Article IV, in each case subject to the exceptions set forth
in the disclosure statement, dated as of the date hereof, delivered by Newbridge
to Stel in connection with the execution of this Agreement (the "Newbridge
Disclosure Statement").  The Newbridge Disclosure Statement shall be arranged in
schedules corresponding to the numbered and lettered Sections of this Article
IV, and the disclosure in any schedule of the Newbridge Disclosure Statement
shall qualify only the corresponding Section of this Article IV.

                                      35



     4.1  Organization, Etc.

          (a) Each of Newbridge, its material subsidiaries listed on Section
4.1(a) of the Newbridge Disclosure Statement (the "Newbridge Material
Subsidiaries") and Merger Sub is a corporation duly organized, validly existing
and in good standing under the laws of the jurisdiction of its incorporation and
has all requisite power and authority to own, lease and operate its properties
and to carry on its business as now being conducted. Newbridge and the Newbridge
Material Subsidiary are each duly qualified as a foreign Person to do business,
and are each in good standing, in each jurisdiction where the character of its
owned or leased properties or the nature of its activities makes such
qualification necessary, except where the failure to be so qualified or in good
standing would not, individually and in the aggregate, have an Newbridge
Material Adverse Effect. None of Newbridge or any Newbridge Material Subsidiary
is in violation of any provision of its certificate of incorporation, bylaws or
any other charter document. For the purposes of this Agreement, "Newbridge
Material Adverse Effect" means any change, event or effect that is materially
adverse to the general affairs, business, operations, assets, condition
(financial or otherwise) or results of operations of Newbridge and the Newbridge
Material Subsidiaries taken as a whole.

          (b) Neither Newbridge, the Newbridge Material Subsidiaries nor Merger
Sub is in violation of any provision of its certificate of incorporation, bylaws
or other charter documents.

     4.2  Authority Relative to This Agreement. Each of Newbridge and Merger Sub
has full corporate power and authority to execute and deliver this Agreement,
the Stock Option Agreement and the Technology Option Agreement, as applicable,
and to consummate the Merger and the other transactions contemplated hereby and
thereby. The execution and delivery of this Agreement, the Stock Option
Agreement and the Technology Option Agreement, and the consummation of the
Merger and the other transactions contemplated hereby and thereby, have been
duly and validly authorized by the board of directors of each of Newbridge and
Merger Sub, as applicable, and no other corporate proceedings on the part of
either Newbridge or Merger Sub are necessary to authorize this Agreement, the
Stock Option Agreement or the Technology Option Agreement or to consummate the
Merger and the other transactions contemplated hereby and thereby. Each of this
Agreement, the Stock Option Agreement and the Technology Option Agreement has
been duly and validly executed and delivered by Newbridge and Merger Sub, as
applicable, and, assuming due authorization, execution and delivery by Stel,
constitutes a valid and binding agreement of each of Newbridge and Merger Sub as
applicable, enforceable against each of them in accordance with its terms,
except to the extent that its enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights generally or by general equitable principles.

                                       36


     4.3  No Violations, Etc. No filing with or notification to, and no permit,
authorization, consent or approval of, any Government Entity is necessary on the
part of either Newbridge or Merger Sub for the consummation by Newbridge or
Merger Sub of the Merger or the other transactions contemplated hereby, and by
the Stock Option Agreement and the Technology Option Agreement, except for (i)
the filing of the Certificate of Merger as required by Delaware Law, (ii) the
filing with the SEC and the effectiveness of the Registration Statement, (iii)
the applicable requirements of the Exchange Act, state or Canadian provincial
securities or "blue sky" laws, state takeover laws and the listing requirements
of the NYSE and the Toronto Stock Exchange, (iv) any filings required under and
in compliance with the HSR Act, and (v) the voluntary notice under the Exon-
Florio Amendment. Neither the execution and delivery of this Agreement, the
Stock Option Agreement and the Technology Option Agreement, nor the consummation
of the Merger or the other transactions contemplated hereby or thereby, nor
compliance by Newbridge and Merger Sub with all of the provisions hereof and
thereof will (i) conflict with or result in any breach of any provision of the
certificate of incorporation, bylaws or other charter documents of Newbridge or
any Newbridge Material Subsidiary, (ii) violate any material order, writ,
injunction, decree, statute, rule or regulation applicable to Newbridge, any
Newbridge Material Subsidiary or by which any of their properties or assets may
be bound, or (iii) result in a violation or breach of, or constitute (with or
without due notice or lapse of time or both) a default, or give rise to any
right of termination, cancellation, acceleration, redemption or repurchase
under, any of the terms, conditions or provisions of any material note, bond,
mortgage, indenture, deed of trust, license, lease, agreement or other
instrument or obligation to which Newbridge or any Newbridge Material Subsidiary
is a party or by which any of them or any of their properties or assets may be
bound.

     4.4  Capitalization. The authorized capital stock of Newbridge consists of
an unlimited number of Common Shares, of which there were 180,427,602 shares
issued and outstanding as of June 17, 1999, and an unlimited number of
participating Preferred Shares, of which no shares are issued or outstanding.
The authorized capital stock of Merger Sub consists of 1,000 shares of Common
Stock, $.01 par value, 1,000 of which, as of the date hereof, are issued and
outstanding and are held by Newbridge. Merger Sub was formed for the purpose of
consummating the Merger and has no material assets or liabilities except as
necessary for such purpose. All outstanding shares of Newbridge Common Stock are
duly authorized, validly issued, fully paid and nonassessable and are not
subject to preemptive rights created by statute, the certificate of
incorporation or bylaws of Newbridge or any agreement to which Newbridge is a
party or by which it is bound.

     4.5  Registration Statement; Proxy Statement/Prospectus. The information
supplied by Newbridge for inclusion or incorporation by reference in the
Registration Statement as it relates to Newbridge or Merger Sub, at the time the
Registration Statement is declared effective, shall not contain any untrue
statement of a material fact

                                       37


or omit to state any material fact required to be stated therein or necessary in
order to make the statements therein not misleading. If at any time prior to the
Effective Time any event with respect to Newbridge or any Newbridge Material
Subsidiary shall occur which is required to be described in the Registration
Statement, such event shall be so described, and an amendment or supplement
shall be promptly filed with the SEC and, as required by law, disseminated to
the shareholders of Stel.

     4.6  SEC Filings. Newbridge has filed with the SEC all required forms,
reports, registration statements and documents required to be filed by it with
the SEC (collectively, all such forms, reports, registration statements and
documents filed after May 1, 1996 are referred to herein as the "Newbridge SEC
Reports"), all of which complied as to form when filed in all material respects
with the applicable provisions of the Securities Act and the Exchange Act, as
the case may be. Accurate and complete copies of the Newbridge SEC reports have
been made available to Stel. As of their respective dates the Newbridge SEC
Reports (including all exhibits and schedules thereto and documents incorporated
by reference therein) did not contain any untrue statement of a material fact or
omit to state a material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances under which they were
made, not misleading.

     4.7  Compliance with Laws. Neither Newbridge nor any Newbridge Material
Subsidiary has violated or failed to comply with any statute, law, ordinance,
rule or regulation (including, without limitation, relating to the export or
import of goods or technology) of any foreign, federal, state or local
government or any other governmental department or agency, except where any such
violations or failures to comply would not, individually or in the aggregate,
have a Newbridge Material Adverse Effect. Newbridge and the Newbridge Material
Subsidiaries have all permits, licenses and franchises from governmental
agencies required to conduct their businesses as now being conducted and as
proposed to be conducted, except for those the absence of which would not,
individually or in the aggregate, have an Newbridge Material Adverse Effect.

     4.8  Financial Statements. Each of the consolidated financial statements
(including, in each case, any related notes thereto) contained in the Newbridge
SEC Reports (the "Newbridge Financial Statements"), (a) was prepared in
accordance with GAAP applied on a consistent basis throughout the periods
involved (except as may be indicated in the notes thereto or, in the case of
unaudited interim financial statements, as may be permitted by the SEC on Form
10-Q under the Exchange Act) and (b) fairly presented the consolidated financial
position of Newbridge and its Subsidiaries as at the respective dates thereof
and the consolidated results of its operations and cash flows for the periods
indicated, consistent with the books and records of Newbridge, except that the
unaudited interim financial statements were or are subject to normal and
recurring year-end adjustments which were not, or are not expected to be,
material in amount. The

                                       38


balance sheet of Newbridge contained in Newbridge's Form 10-K for the fiscal
year ended May 2, 1999 is hereinafter referred to as the "Newbridge Balance
Sheet."

     4.9  Absence of Undisclosed Liabilities. Neither Newbridge nor any of its
Subsidiaries has any liabilities (absolute, accrued, contingent or otherwise)
other than (i) liabilities included in the Newbridge Balance Sheet and the
related notes to the financial statements, (ii) normal or recurring liabilities
incurred since May 2, 1999 in the ordinary course of business consistent with
past practice, which, individually or in the aggregate, are not or would not be
reasonably likely to have, an Newbridge Material Adverse Effect and (iii)
liabilities under this Agreement, the Stock Option Agreement and the Technology
Option Agreement.

     4.10 Absence of Changes or Events. Except as contemplated by this
Agreement, between May 2, 1999, and the date of this Agreement, no Newbridge
Material Adverse Effect has occurred.

     4.11 Litigation.

          (a)  Except as set forth in the Newbridge SEC Reports, there is no
Action pending or, to the knowledge of Newbridge, threatened against Newbridge
or any of its Subsidiaries, or any of their respective officers and directors
(in their capacities as such), or involving any of their assets, before any
court, or governmental or regulatory authority or body, or arbitration tribunal,
except for those Actions which, individually or in the aggregate, would not have
an Newbridge Material Adverse Effect. There is no Action pending or, to the
knowledge of Newbridge, threatened which in any manner challenges, seeks to, or
is reasonably likely to prevent, enjoin, alter or delay the transactions
anticipated by this Agreement.

          (b)  There is no outstanding judgment, order, writ, injunction or
decree of any court, governmental agency or arbitration tribunal in a proceeding
to which Newbridge, any Newbridge Material Subsidiary or any of their assets is
a party, or by which Newbridge, any Newbridge Material Subsidiary or any of
their assets is bound.

                                   ARTICLE V

                                   COVENANTS


     5.1  Conduct of Business During Interim Period. Except as contemplated or
required by this Agreement or as expressly consented to in writing by Newbridge,
during the period from the date of this Agreement to the earlier of the
termination of this Agreement or the Effective Time, each of Stel and its
Subsidiaries will (i) conduct its operations according to its ordinary and usual
course of business consistent with past practice, (ii) use all commercially
reasonable efforts to preserve intact its business organization, to keep
available the services of its officers and employees in each business

                                       39


function and to maintain satisfactory relationships with suppliers,
distributors, customers and others having business relationships with it, and
(iii) not take any action which would adversely affect its ability to consummate
the Merger or the other transactions contemplated by this Agreement, the Stock
Option Agreement or the Technology Option Agreement. Without limiting the
generality of the foregoing, and except as otherwise expressly provided in this
Agreement, prior to the earlier of the termination of this Agreement or
Effective Time neither Stel nor any of its Subsidiaries will, without the prior
written consent of Newbridge, directly or indirectly, do any of the following:

          (a)  enter into, violate, amend or otherwise modify or waive any of
the terms of, (i) any license or partnership, joint venture, or other agreement
relating to the joint development or transfer of technology or Stel IP Rights;
or (ii) any other agreements, commitments or contracts, except in the ordinary
course of business and consistent with past practice;

          (b)  (i) with respect to Stel's wireless broadband and satellite
personal communications products, accept any new or incremental work orders from
current customers or enter into any new contractual obligations with customers
other than Newbridge and, (ii) with respect to Stel's telcom component products,
agree to undertake research and development work for any third party with a term
extending beyond May 31, 2000;

          (c)  authorize, solicit, propose or announce an intention to
authorize, recommend or propose, or enter into any agreement in principle or an
agreement with any other person with respect to, any plan of liquidation or
dissolution, any acquisition of a material amount of assets or securities, any
disposition of a material amount of assets or securities, any material change in
capitalization, or any partnership, association, joint venture, joint
development, technology transfer, or other material business alliance;

          (d)  fail to renew any insurance policy naming it as a beneficiary or
a loss payee, or take any steps or fail to take any steps that would permit any
insurance policy naming it as a beneficiary or a loss payee to be canceled,
terminated or materially altered, except in the ordinary course of business and
consistent with past practice and following written notice to Newbridge;

          (e)  maintain its books and records in a manner other than in the
ordinary course of business and consistent with past practice;

          (f)  enter into any hedging, option, derivative or other similar
transaction or any foreign exchange position or contract for the exchange of
currency other than in the ordinary course of business and consistent with past
practice;

          (g)  institute any change in its accounting methods, principles or
practices other than as required by GAAP, or the rules and regulations
promulgated by

                                       40


the SEC, or revalue any of its respective assets, including without limitation,
writing down the value of inventory or writing off notes or accounts
receivables;

          (h)  pay, discharge or satisfy any material claims, liabilities or
obligations (absolute, accrued, contingent or otherwise), other than the
payment, discharge or satisfaction of liabilities (including accounts payable)
in the ordinary course of business and consistent with past practice, or
collect, or accelerate the collection of, any amounts owed (including accounts
receivable) other than the collection in the ordinary course of business;

          (i)  split, combine or reclassify any shares of its capital stock;

          (j)  issue any capital stock or other options, warrants or rights to
purchase or acquire capital stock or change the terms of any such outstanding
securities, except that Stel may (i) issue capital stock upon the exercise of
options, warrants or rights outstanding as of the date of this Agreement and
(ii) accelerate those Stel Options that are not to be assumed or substituted
with equivalent options or other economic benefits by Newbridge or by the
purchasers of Stel's Non-core Assets;

          (k)  waive, release, assign, settle or compromise any material claim
or litigation, or commence a lawsuit other than (i) for the routine collection
of bills, (ii) the settlement of the litigation with Cabletron Systems, Inc.,
(iii) in such cases where Stel determines in good faith that failure to commence
suit would result in the material impairment of a valuable aspect of its
business, provided that Stel consults with Newbridge prior to the filing of such
a suit, or (iv) for a breach of this Agreement;

          (l)  in respect of any Taxes, make or change any material election
change any accounting method, enter into any closing agreement, settle any
material claim or assessment, or consent to any extension or waiver of the
limitation period applicable to any material claim or assessment except as
required by applicable law;

          (m)  take or agree to take, any of the actions described in Section
3.10, or any action which would make any of its representations or warranties
contained in this Agreement untrue or incorrect or prevent it from performing or
cause it not to perform its covenants hereunder.

     5.2  No Solicitation.

          (a)  From and after the date of this Agreement until the Effective
Time or termination of this Agreement pursuant to Article VIII, Stel and its
Subsidiaries will not, nor will they authorize or permit any of their respective
officers, directors, affiliates, agents or employees or any investment banker,
attorney or other advisor or representative retained by any of them to, directly
or indirectly, (i) solicit, initiate, encourage or induce the making, submission
or announcement of any Acquisition Proposal (as defined in

                                       41


Section 5.2(c)), (ii) participate in any discussions or negotiations regarding,
or furnish to any person any non-public information with respect to, or take any
other action to facilitate any inquiries or the making of any proposal that
constitutes or may reasonably be expected to lead to, any Acquisition Proposal,
(iii) engage in discussions with any person with respect to any Acquisition
Proposal, (iv) approve, endorse or recommend any Acquisition Proposal or (v)
enter into any letter of intent or similar document or any agreement or
commitment contemplating or otherwise relating to any Acquisition Transaction
(as defined in Section 5.2(c)). Notwithstanding anything to the contrary
contained in this Section 5.2 or in any other provision of this Agreement, Stel
and its board of directors (i) may participate in discussions or negotiations
with or furnish non-public information to any third party that has made an
unsolicited Acquisition Proposal (a "Potential Acquiror") and/or (ii) subject to
the provisions of Section 5.4(c), may approve or accept an unsolicited
Acquisition Proposal, in each case only if the board of directors of Stel
determines in good faith (A) after receiving written advice from its financial
advisor, that such Acquisition Proposal is a Superior Proposal (as defined in
Section 5.2(d) hereof), and (B) following consultation with outside legal
counsel, that the failure to participate in such discussions or negotiations or
to furnish such information or approve or accept an Acquisition Proposal would
violate the board's fiduciary duties under applicable law. Stel may not furnish
any non-public information to a Potential Acquiror unless it is furnished
pursuant to a confidentiality agreement containing provisions at least as
favorable to Stel as the confidentiality provisions of the Confidentiality
Agreement (as defined in Section 5.3) and is simultaneously provided to
Newbridge. Without limiting the foregoing, it is understood that any violation
of the restrictions set forth in this Section 5.2(a) by any officer, director or
employee of Stel or any of its Subsidiaries or any investment banker, attorney
or other advisor or representative of Stel or any of its Subsidiaries shall be
deemed to be a breach of this Section 5.2(a) by Stel.

          (b)  In addition to the obligations of Stel set forth in Section
5.2(a), Stel as promptly as practicable, and in any event within 24 hours, shall
advise Newbridge orally and in writing of any Acquisition Proposal or any
request for non-public information or inquiry which Stel reasonably believes
would lead to an Acquisition Proposal or to any Acquisition Transaction, the
material terms and conditions of such Acquisition Proposal, request or inquiry,
and the identity of the person or group making any such Acquisition Proposal,
request or inquiry. Stel will keep Newbridge informed as promptly as practicable
in all material respects of the status and details (including material
amendments or proposed material amendments) of any such Acquisition Proposal,
request or inquiry.

          (c)  For purposes of this Agreement, "Acquisition Proposal" shall mean
any offer or proposal made by a Third Party (as defined below) relating to any
Acquisition Transaction. For purposes of this Agreement, "Acquisition
Transaction" shall mean any transaction or series of related transactions
involving: (i) any purchase

                                       42


from Stel or acquisition by any Person (or any group of Persons acting in
concert for the specific purpose of allowing Stel to evade the provisions of
this Section 5.2) other than Newbridge, Stel or Merger Sub or any affiliate
thereof (a "Third Party") of 15% or more of the total interest in the total
outstanding voting securities of Stel or any of its Subsidiaries or any tender
offer or exchange offer that if consummated would result in any Third Person (or
its shareholder) beneficially owning 15% or more of the total outstanding voting
securities of Stel or any of its Subsidiaries; (ii) any merger, consolidation,
business combination or similar transaction involving Stel or any of its
Subsidiaries; (iii) any sale, lease (other than in the ordinary course of
business), exchange, transfer, license (other than in the ordinary course of
business), acquisition or disposition of a material portion of the assets of
Stel (excluding the Non-core Assets); (iv) any liquidation or dissolution of
Stel; or (v) the acquisition by a Third Party (or potential acquisition upon the
completion of a transaction or series of related transactions) of control of the
board of directors of Stel or the election or appointment of nominees of a Third
Party (or the ability of a Third Party to elect or appoint its nominees) to a
majority of the seats on the board of directors of Stel.

          (d)  The term "Superior Proposal" means any bona fide Acquisition
Proposal, made in writing and not initiated, solicited or encouraged in
violation of Section 5.2(a) of this Agreement, on terms which the board of
directors of Stel determines in good faith to be more favorable to Stel and its
stockholders or to its stockholders than the Merger (after receiving the written
advice from Stel's financial advisor that the value of the consideration
provided for in such proposal is superior to the value of the consideration
provided for in the Merger), for which financing, to the extent required, is
then committed or which, in the good faith judgment of the board of directors of
Stel, after receiving written advice from its financial advisor, is reasonably
capable of being financed by the Potential Acquiror.

     5.3  Access to Information. From the date of this Agreement until the
Effective Time, Stel will afford Newbridge and its authorized representatives
(including counsel, environmental and other consultants, accountants, auditors
and agents) full access during normal business hours and upon reasonable notice
to all of its facilities, personnel and operations and to all books and records
of it and its Subsidiaries, will permit Newbridge and its authorized
representatives to conduct inspections as they may reasonably request and will
instruct its officers and those of its Subsidiaries to furnish such persons with
such financial and operating data and other information with respect to its
business and properties as they may from time to time request, subject to the
restrictions set forth in the Confidentiality Agreement (as defined below).
Newbridge and Merger Sub agree that each of them will treat any such information
in accordance with the Confidentiality Agreement, effective as of March 1, 1999,
between Newbridge and Stel (the "Confidentiality Agreement"), which
Confidentiality Agreement, except for the standstill provisions, shall remain in
full force and effect in accordance with its terms.

                                       43


     5.4  Special Meeting; Registration Statement; Board Recommendation.

          (a)  Promptly after the date hereof, Stel will take all action
necessary in accordance with Delaware Law and its certificate of incorporation
and bylaws to convene a meeting of Stel's stockholders to consider adoption and
approval of this Agreement and approval of the Merger (the "Stel Special
Meeting") to be held as promptly as practicable, and in any event (to the extent
permissible under applicable law) within 45 days after the declaration of
effectiveness of the Registration Statement. Subject to Section 5.4(c), Stel
will use its commercially reasonable efforts to solicit from its stockholders
proxies in favor of the adoption and approval of this Agreement and the approval
of the Merger and will take all other action necessary or advisable to secure
the vote or consent of its stockholders required by the rules of Nasdaq or
Delaware Law to obtain such approvals. Notwithstanding anything to the contrary
contained in this Agreement, Stel may adjourn or postpone the Stel Special
Meeting to the extent necessary to ensure that any necessary supplement or
amendment to the Prospectus/Proxy Statement is provided to Stel's stockholders
in advance of a vote on the Merger and this Agreement or, if as of the time for
which the Stel Special Meeting is originally scheduled (as set forth in the
Prospectus/Proxy Statement) there are insufficient shares of Stel Common Stock
represented (either in person or by proxy) to constitute a quorum necessary to
conduct the business of the Stel Special Meeting. Stel shall ensure that the
Stel Special Meeting is called, noticed, convened, held and conducted, and that
all proxies solicited by Stel in connection with the Stel Special Meeting are
solicited, in compliance with the Delaware Law, Stel's certificate of
incorporation and bylaws, the rules of Nasdaq and all other applicable legal
requirements. Stel's obligation to call, give notice of, convene and hold the
Stel Special Meeting in accordance with this Section 5.4(a) shall not be limited
to or otherwise affected by the commencement, disclosure, announcement or
submission to Stel of any Acquisition Proposal, or by any withdrawal, amendment
or modification of the recommendation of the board of directors of Stel with
respect to the Merger and/or this Agreement.

          (b)  Subject to Section 5.4(c), (i) the board of directors of Stel
shall unanimously recommend that Stel's stockholders vote in favor of and adopt
and approve this Agreement and approve the Merger at the Stel Special Meeting;
(ii) Stel shall cause the Prospectus/Proxy Statement to include a statement to
the effect that the board of directors of Stel has unanimously recommended that
Stel's stockholders vote in favor of and adopt and approve this Agreement and
the Merger at the Stel Special Meeting; and (iii) neither the board of directors
of Stel nor any committee thereof shall withdraw, amend or modify, or propose or
resolve to withdraw, amend or modify in a manner adverse to Newbridge, the
unanimous recommendation of the board of directors of Stel that Stel's
stockholders vote in favor of and adopt and approve this Agreement and the
Merger. For purposes of this Agreement, said recommendation of the board of
directors shall be deemed to have been modified in a manner adverse to Newbridge
if said recommendation shall no longer be unanimous, provided that, for all
purposes of this

                                       44


Agreement, an action by any board of directors or committee thereof shall be
unanimous if each member of such board of directors or committee has approved
such action other than (i) any such member who has appropriately abstained from
voting on such matter because of an actual or potential conflict of interest and
(ii) any such member who is unable to vote in connection with such action as a
result of death or disability.

          (c)  Nothing in Section 5.4(b) shall prevent the board of directors of
Stel from withholding, withdrawing, amending or modifying its unanimous
recommendation that Stel stockholders vote in favor of and adopt and approve
this Agreement and approve the Merger if (i) a Superior Proposal is made to Stel
and is not withdrawn, (ii) Stel shall have provided written notice to Newbridge
(a "Notice of Superior Proposal") advising Newbridge that Stel has received a
Superior Proposal, specifying the material terms and conditions of such Superior
Proposal and identifying the person or entity making such Superior Proposal,
(iii) Newbridge shall not have, within five business days of Newbridge's receipt
of the Notice of Superior Proposal, made an offer that the board of directors of
Stel by a majority vote determines in its good faith judgment (based on the
written advice of its financial advisor) to be at least as favorable to Stel's
stockholders as such Superior Proposal (it being agreed that the board of
directors of Stel shall convene a meeting to consider any such offer by
Newbridge promptly following the receipt thereof), (iv) after such board
meeting, the board of directors of Stel shall have concluded in good faith,
after consultation with its outside counsel, that, in light of such Superior
Proposal, the withholding, withdrawal, amendment or modification of such
recommendation is required in order for the board of directors of Stel to comply
with its fiduciary obligations to Stel's stockholders under applicable law and
(v) Stel shall not have violated any of the restrictions set forth in Section
5.2 or this Section 5.4(c). Subject to applicable laws, nothing contained in
this Section 5.4(c) shall limit Stel's obligation to hold and convene the Stel
Special Meeting (regardless of whether the unanimous recommendation of the board
of directors of Stel shall have been withheld, withdrawn, amended or modified).
If the Stel board has withheld, withdrawn, amended or modified its
recommendation as provided in this Section 5.4(c), Stel shall not be required to
solicit proxies from its stockholders to vote in favor of and approve and adopt
this Agreement and the Merger; provided that Stel shall use its commercially
reasonable efforts to solicit a sufficient number of proxies (without regard to
the manner in which votes are cast by those proxies) to ensure the presence of a
quorum of stockholders at the Stel Special Meeting.

          (d)  Nothing contained in this Agreement shall prohibit Stel or its
board of directors from complying with the requirements of Rules 14d-9 and 14e-
2(a) promulgated under the Exchange Act.

          (e)  As promptly as practicable after the execution of this Agreement,
Stel and Newbridge shall mutually prepare, and Stel shall file with the SEC, a
preliminary form of the Proxy Statement/Prospectus. As promptly as practicable
following receipt of SEC comments on such preliminary Proxy
Statement/Prospectus, Newbridge and Stel

                                       45


shall mutually prepare a response to such comments. Upon resolution of all
comments, Newbridge shall file the Registration Statement with the SEC.
Newbridge and Stel shall use all commercially reasonable efforts to have the
preliminary Proxy Statement/Prospectus cleared by the SEC and the Registration
Statement declared effective by the SEC as promptly as practicable. Newbridge
shall also take any action required to be taken under applicable state blue sky
or securities laws in connection with Newbridge Common Stock to be issued in
exchange for the shares of Stel Common Stock. Newbridge and Stel shall promptly
furnish to each other all information, and take such other actions (including
without limitation using all commercially reasonable efforts to provide any
required consents of their respective independent auditors), as may reasonably
be requested in connection with any action by any of them in connection with the
preceding sentences of this Section 5.4(e). Whenever any party learns of the
occurrence of any event which is required to be set forth in an amendment or
supplement to the Proxy Statement/Prospectus, the Registration Statement or any
other filing made pursuant to this Section 5.4(e), Newbridge or Stel, as the
case may be, shall promptly inform the other of such occurrence and cooperate in
filing with the SEC or its staff and/or mailing to stockholders of Stel such
amendment or supplement.

     5.5  Commercially Reasonable Efforts. Subject to the terms and conditions
herein provided, Newbridge, Merger Sub and Stel shall use all commercially
reasonable efforts to take, or cause to be taken, all other actions and do, or
cause to be done, all other things necessary, proper or appropriate under
applicable laws and regulations to consummate and make effective the
transactions contemplated by this Agreement, including, without limitation, (a)
promptly filing Notification and Report Forms under the HSR Act with the Federal
Trade Commission (the "FTC") and the Antitrust Division of the Department of
Justice (the "Antitrust Division") and responding as promptly as practicable to
any inquiries received from the FTC or the Antitrust Division for additional
information or documentation, (b) promptly filing a notification with the
Committee on Foreign Investment in the United States ("CFIUS") under the Exon-
Florio Amendment and responding as promptly as practicable to any inquiries
received from CFIUS for additional information or documentation, including,
without limitation, taking such actions as may be required by the U.S.
Department of Defense to mitigate foreign ownership, control or influence with
respect to the performance of classified Government Contracts; (c) obtaining all
necessary governmental and private party consents, approvals or waivers, and (d)
lifting any legal bar to the Merger and the exercise of the option granted in
the Stock Option Agreement. Newbridge shall cause Merger Sub to perform all of
its obligations under this Agreement and shall not take any action which would
cause Stel to fail to perform its obligations hereunder. Stel shall not take any
action which would cause Newbridge or Merger Sub to fail to perform their
obligations hereunder.

     5.6  Public Announcements. Before issuing any press release or otherwise
making any public statement with respect to the Merger or any of the other
transactions contemplated hereby, Newbridge, Merger Sub and Stel agree to
consult with each other

                                       46


as to its form and substance, and agree not to issue any such press release or
general communication to employees or make any public statement prior to
obtaining the consent of the other (which shall not be unreasonably withheld or
delayed), except as may be required by applicable law or by the rules and
regulations of or listing agreement with the NYSE, the Nasdaq, The Toronto Stock
Exchange or as may otherwise be required by of the NYSE, Nasdaq, the SEC or
Canadian securities authorities.

     5.7  Notification of Certain Matters. Each of Stel and Newbridge shall
promptly notify the other party of the occurrence or non-occurrence of any event
the respective occurrence or non-occurrence of which would be likely to cause
any condition to the obligations of the notifying party to effect the Merger not
to be fulfilled. Each of Stel and Newbridge shall also give prompt notice to the
other of any communication from any Person alleging that the consent of such
Person is or may be required in connection with the Merger or other transactions
contemplated hereby.

     5.8  Indemnification.

          (a)  The certificate of incorporation and bylaws of the Surviving
Corporation shall contain, and Newbridge shall cause the Surviving Corporation
to fulfill and honor, the provisions with respect to indemnification set forth
in the certificate of incorporation and bylaws of Stel as of the date of this
Agreement, which provisions shall not be amended, repealed or otherwise modified
for a period of six years from the Effective Time in any manner that would
adversely affect the rights thereunder of individuals who, immediately prior to
the Effective Time, were directors and officers of Stel, unless such
modification is required by law.

          (b)  After the Effective Time the Surviving Corporation, to the
fullest extent permitted under applicable law or under the Surviving
Corporation's certificate of incorporation or bylaws, shall hold harmless, (i)
each present director or officer of Stel and each of its Subsidiaries, and (ii)
each person identified on Schedule 5.8(b) as presently serving at the request of
Stel or any Subsidiary of Stel as a director, officer, trustee, partner,
fiduciary, employee or agent of another corporation, partnership, joint venture,
trust, pension or other employee benefit plan or enterprise (collectively, the
"Indemnified Parties") against any costs or expenses (including attorneys'
fees), judgments, fines, losses, claims, damages, liabilities and amounts paid
in settlement in connection with any claim, action, suit, proceeding or
investigation, whether civil, criminal, administrative or investigative, to the
extent arising out of or pertaining to any action or omission in his or her
capacity as a director or officer of Stel arising out of or pertaining to the
transactions contemplated by this Agreement for a period of six years after the
date hereof. In the event of any such claim, action, suit, proceeding or
investigation (whether arising before or after the Effective Time), (i) any
counsel retained by the Indemnified Parties for any period after the Effective
Time must be reasonably satisfactory to Newbridge, (ii) after the Effective
Time, Newbridge shall cause the

                                       47


Surviving Corporation to pay the reasonable fees and expenses of such counsel,
promptly after statements therefor are received and (iii) Newbridge shall cause
the Surviving Corporation to cooperate in the defense of any such matter;
provided, however, that neither Newbridge nor the Surviving Corporation shall be
liable for any settlement effected without its written consent (which consent
shall not be unreasonably withheld); and provided, further, that, in the event
that any claim or claims for indemnification are asserted or made within such
six-year period, all rights to indemnification in respect of any such claim or
claims shall continue until the disposition of any and all such claims; and
provided, further, that nothing in this Section 5.8 shall impair any rights or
obligations of any present or former directors or officers of Stel. The
Indemnified Parties as a group may retain only one law firm (in addition to
local counsel) to represent them with respect to any single action unless there
is, under applicable standards of professional conduct, a conflict on any
significant issue between the positions of any two or more Indemnified Parties.
In the event Newbridge or the Surviving Corporation or any of their respective
successors or assigns (i) consolidates with or merges into any other Person and
shall not be the continuing or surviving corporation or entity of such
consolidation or merger, or (ii) transfers or conveys all or substantially all
of its properties and assets to any Person, then, and in each such case, to the
extent necessary to effectuate the purposes of this Section 5.8, proper
provision shall be made so that the successors and assigns of Newbridge and the
Surviving Corporation assume the obligations of such party set forth in this
Section 5.8 and none of the actions described in clause (i) or (ii) shall be
taken until such provision is made.

          (c)  For a period of six years after the Effective Time, Newbridge
shall or shall cause the Surviving Corporation to maintain in effect, if
available, directors' and officers' liability insurance covering those persons
who are currently covered by Stel's directors' and officers' liability insurance
policy on terms comparable to those applicable under the policy of directors'
and officers' liability insurance currently maintained by Stel; provided,
however, that in no event shall Newbridge or the Surviving Corporation be
required to expend in excess of 150% of the annual premium currently paid by
Stel for such coverage, and that if the annual premiums of such insurance
coverage exceed such amount, the Surviving Corporation shall be obligated
instead to obtain a policy with the greatest coverage available for a cost not
exceeding such amount.

          (d)  Newbridge shall cause the Surviving Corporation to perform its
obligations under this Section 5.8 and shall, in addition, guarantee, as co-
obligor with the Surviving Corporation, the performance of such obligations by
the Surviving Corporation.

     5.9  Affiliate Agreements. Concurrently with the execution and delivery
hereof, Stel shall deliver to Newbridge a list (reasonably satisfactory to
counsel for Newbridge), setting forth the names of all Persons who are expected
to be, at the Effective Time, in Stel's reasonable judgment, "affiliates" of
Stel as that term is used in paragraphs (c) and

                                       48


(d) of Rule 145 under the Securities Act (the "Stel Affiliates"). Stel shall
furnish such information and documents as Newbridge may reasonably request for
the purpose of reviewing such list. Stel shall use commercially reasonable
efforts to deliver a written agreement in substantially the form of Exhibit F
hereto (a "Stel Affiliate Agreement") executed by each Person identified as a
Stel Affiliate in the list furnished pursuant to this Section 5.9 within ten
days of the execution of this Agreement. Stel shall deliver to Newbridge an
updated list reflecting any change in the identity of the Stel Affiliates within
five days of Stel's having knowledge of such change. In the event additional
Persons become Stel Affiliates after the date hereof, Stel shall use
commercially reasonable efforts to cause each such Person to deliver to
Newbridge a written agreement in substantially the form of Exhibit F hereto with
each such Person within ten days after Stel has knowledge that such Person has
become a Stel Affiliate.

     5.10 Listings. Newbridge shall use commercially reasonable efforts to list
on the NYSE, upon official notice of issuance, the shares of Newbridge Common
Stock to be issued in connection with the Merger. Newbridge shall use
commercially reasonable efforts to list on the Toronto Stock Exchange, subject
to the satisfaction of customary conditions, the shares of Newbridge Common
Stock to be issued in connection with the Merger.

     5.11 Resignation of Directors and Officers. Prior to the Effective Time,
Stel shall deliver to Newbridge the resignations of such directors and officers
of Stel and its Subsidiaries as Newbridge shall specify at least ten business
days prior to the Closing, effective at the Effective Time.

     5.12 Form S-8.  No later than ten business days after the Effective Time,
Newbridge shall file with the SEC a Registration Statement, on Form S-8 or other
appropriate form under the Securities Act to register Newbridge Common Stock
issuable upon exercise of the Newbridge Exchange Options.  Newbridge shall use
commercially reasonable efforts to cause such Registration Statement to remain
effective until the exercise or expiration of such options.

     5.13 SEC Filings.

          (a)  Stel will deliver promptly to Newbridge true and complete copies
of each report, registration statement or statement mailed by it to its security
holders generally or filed by it with the SEC, in each case subsequent to the
date hereof and prior to the Effective Time. As of their respective dates, such
reports, including the consolidated financial statements included therein, and
statements (excluding any information therein provided by Newbridge or Merger
Sub, as to which Stel makes no representation) will not contain any untrue
statement of a material fact or omit to state a material fact required to be
stated therein or necessary to make the statements therein, in light of the
circumstances under which they are made, not misleading and will comply in all
material respects with all applicable requirements of law. Each of the
consolidated

                                       49


financial statements (including, in each case, any related notes thereto)
contained in such reports, (i) shall comply as to form in all material respects
with applicable accounting requirements and with the published rules and
regulations of the SEC with respect thereto, (ii) shall be prepared in
accordance with GAAP applied on a consistent basis throughout the periods
involved (except as may be indicated in the notes thereto or, in the case of
unaudited interim financial statements, as may be permitted by the SEC on Form
10-Q under the Exchange Act) and (iii) shall fairly present the consolidated
financial position of Stel and its Subsidiaries as at the respective dates
thereof and the consolidated results of its operations and cash flows for the
periods indicated, except that the unaudited interim financial statements were
or are subject to normal and recurring year-end adjustments which were not, or
are not expected to be, material in amount.

          (b)  Newbridge will deliver promptly to Stel true and complete copies
of each report filed by it with the SEC subsequent to the date hereof and prior
to the Effective Time. As of their respective dates, such reports, including the
consolidated financial statements included therein, and statements (excluding
any information therein provided by Stel, as to which Newbridge makes no
representation) will not contain any untrue statement of a material fact or omit
to state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they are made, not
misleading and will comply in all material respects with all applicable
requirements of law. Each of the consolidated financial statements (including,
in each case, any related notes thereto) contained in such reports (i) shall
comply as to form in all material respects with applicable accounting
requirements and with the published rules and regulations of the SEC with
respect thereto, (ii) shall be prepared in accordance with GAAP applied on a
consistent basis throughout the periods involved (except as may be indicated in
the notes thereto or, in the case of unaudited interim financial statements, as
may be permitted by the SEC on Form 10-Q under the Exchange Act) and (iii) shall
fairly present the consolidated financial position of Newbridge and its
Subsidiaries as at the respective dates thereof and the consolidated results of
its operations and cash flows for the periods indicated, except that the
unaudited interim financial statements were or are subject to normal and
recurring year-end adjustments which were not, or are not expected to be,
material in amount.

     5.14 Employee Matters. Newbridge agrees to make severance payments to
persons who are Stel employees immediately prior to the Effective Time and who
are terminated on or within 90 days of the Effective Time and to pay to
employees of Stel as of the Effective Time the other benefits as set forth in
Schedule 5.14.

     5.15 Termination of Stel Purchase Plan.   Stel, acting through its board of
directors, shall take all action necessary to discontinue the Stel Purchase Plan
effective upon purchase of Stel Common Stock for the Participation Period ending
September 30, 1999.

                                       50


     5.16 Stock Option Agreement. Stel agrees not to take any action that would
impede, bar, restrict or otherwise interfere in any manner with Newbridge's
rights under the Stock Option Agreement.

     5.17 Technology Option Agreement. Stel agrees not to take any action that
would impede, bar, restrict or otherwise interfere in any manner with
Newbridge's rights under the Technology Option Agreement.

     5.18 Non-core Asset Sale. Stel shall use its best efforts to cause the sale
or sales (the "Non-core Asset Sale") of all assets (or the shares of the legal
entity or entities to which they belong) of all Stel's current operating
divisions other than its wireless broadband products division, its telecom
component products division and its satellite personal communications division
(the "Non-core Assets") for an aggregate purchase price which will result in
after-tax net cash proceeds of not less than U.S. $102,000,000. Newbridge agrees
that the Non-core Asset Sale may include net cash generated by the Non-core
Assets subsequent to March 31, 1999. Stel agrees that it will inform Newbridge
of any proposals, discussions or negotiations concerning the sale of such
divisions and that it will include Newbridge and Newbridge's advisors, including
CIBC World Markets, in all such discussions and negotiations regarding the Non-
core Asset Sale. Newbridge and Stel agree to use commercially reasonable efforts
to maximize the Non-core Asset Sale Proceeds.

     5.19 Assumption of Options. The parties will use all commercially
reasonable efforts to obtain the agreement of purchasers of the Non-core Assets
to assume or substitute equivalent options or other economic benefits for the
unvested Stel Options that would not qualify for accelerated vesting pursuant to
Stel's Stock Option Plan as of the Effective Time held by Stel employees to be
hired by such purchasers.

     5.20 Transitional Contract-Manufacturing Arrangement. Stel and Newbridge
will use all commercially reasonable efforts to enter into a transitional
contract manufacturing arrangement with the contract manufacturing facility that
will be sold as part of the Non-core Asset Sale.

     5.21 Stel IP Rights.  Stel will use all commercially reasonable efforts to
amend any agreements giving any Third Party rights to Stel IP Rights as a result
of the execution and delivery of this Agreement, the Stock Option Agreement, the
Technology Option Agreement or the consummation of the Merger and the other
transactions contemplated hereby or thereby.

     5.22 Appraisal Rights.  Stel and Newbridge will take all necessary and
appropriate action to enable the holders of Stel Common Stock to exercise
appraisal rights, if available, under Section 262 of the Delaware Law and
otherwise to comply with the terms of such statute.

                                       51


                                  ARTICLE VI

                  CONDITIONS TO THE OBLIGATIONS OF EACH PARTY

     The respective obligations of each party to this Agreement to effect the
Merger shall be subject to the fulfillment on or before the Effective Time of
each of the following conditions, any one or more of which may be waived in
writing by all the parties hereto:



     6.1  Registration Statement.  The Registration Statement shall have become
effective in accordance with the provisions of the Securities Act.  No stop
order suspending the effectiveness of the Registration Statement shall have been
issued by the SEC and remain in effect and no proceedings for such purpose shall
be pending before or threatened by the SEC.

     6.2  Stockholder Approval.  The approval of the holders representing a
majority of the outstanding shares of Stel Common Stock for adoption of the
Merger Agreement and approval of the Merger shall have been obtained at the Stel
Special Meeting or any adjournment or postponement thereof.

     6.3  Listing of Additional Shares.  The Newbridge Common Stock issuable in
connection with the Merger shall have been approved for listing subject to
official notice of issuance on the NYSE and shall have been approved for listing
subject to the satisfaction of customary conditions on the Toronto Stock
Exchange.

     6.4  Government Clearances. The waiting periods applicable to consummation
of the Merger under the HSR Act and Exon-Florio Amendment shall have expired or
been terminated. Other than the filing of the Certificate of Merger which shall
be accomplished as provided in Section 1.2, all authorizations, consents, orders
or approvals of, or declarations or filings with, or expirations of waiting
periods imposed by, any Government Entity the failure of which to obtain or
comply with prior to the Effective Time would be reasonably likely to have a
Stel Material Adverse Effect or a Newbridge Material Adverse Effect shall have
been obtained or filed.

     6.5  Statute or Decree.  No writ, order, temporary restraining order,
preliminary injunction or injunction shall have been enacted, entered,
promulgated or enforced by any court or other tribunal or governmental body or
authority, which remains in effect, and prohibits the consummation of the Merger
or otherwise makes it illegal, nor shall any governmental agency have instituted
any action, suit or proceeding which remains pending and which seeks, and which
is reasonably likely, to enjoin, restrain or prohibit the consummation of the
Merger in accordance with the terms of this Agreement.

                                       52


                                  ARTICLE VII

              CONDITIONS TO THE OBLIGATIONS OF STEL AND NEWBRIDGE


     7.1  Additional Conditions To The Obligations Of Stel.  The obligations of
Stel to effect the Merger shall be subject to the fulfillment of each of the
following additional conditions, any one or more of which may be waived in
writing by Stel:

          (a) The representations and warranties of Newbridge and Merger Sub
contained in this Agreement (without regard to any materiality exceptions or
provisions therein) shall be true and correct, in all material respects, as of
the Effective Time, with the same force and effect as if made at the Effective
Time, except (i) for changes specifically permitted by the terms of this
Agreement, (ii) that the accuracy of the representations and warranties that by
their terms speak as of the date of this Agreement or some other date will be
determined as of such date, and (iii) for such inaccuracies as, in the
aggregate, would not reasonably be expected to have a Newbridge Material Adverse
Effect.

          (b) Newbridge and Merger Sub shall have performed and complied in all
material respects with all agreements, obligations and conditions required by
this Agreement to be performed or complied with by them on or prior to the
Closing Date.

          (c) Newbridge and Merger Sub shall have furnished certificates of
their respective officers to evidence compliance with the conditions set forth
in Sections 7.1(a) and (b) of this Agreement.

          (d) Stel shall have received an opinion of Thelen Reid & Priest LLP,
counsel to Stel, dated as of the Closing Date, substantially to the effect that
on the basis of the facts, representations and assumptions set forth in such
opinions, (i) the Merger will be treated as a reorganization within the meaning
of Section 368(a) of the Code; (ii) each of Newbridge, Merger Sub and Stel will
be a party to such reorganization within the meaning of Section 368(b) of the
Code; and (iii) except with respect to cash received in lieu of fractional share
interests in Newbridge Common Stock, no gain or loss will be recognized, for
United States federal income tax purposes, by a stockholder of Stel as a result
of the Merger with respect to the shares of Stel Common Stock converted into
Newbridge Common Stock.

          (e) If the Non-core Asset Sale has not closed on or prior to the
Effective Time, Newbridge and the Rights Agent (as defined in the CVR Agreement)
shall have executed the CVR Agreement substantially in the form attached hereto
as Exhibit E.
   ---------

     7.2  Additional Conditions To The Obligations Of Newbridge And Merger Sub.
The obligations of Newbridge and Merger Sub to effect the Merger shall be
subject

a

                                       53


to the fulfillment of each of the following additional conditions, any one or
more of which may be waived in writing by Newbridge:

          (a)  The representations and warranties of Stel contained in this
Agreement (without regard to any materiality exceptions or provisions therein)
shall be true and correct, in all material respects, as of the Effective Time,
with the same force and effect as if made at the Effective Time, except, (i) for
changes related to the balance sheets or assets of the Non-core Assets, (ii) for
changes in the prospects of Stel's constellation project, (iii) for other
changes specifically permitted by the terms of this Agreement, (iv) that the
accuracy of the representations and warranties that by their terms speak as of
the date of this Agreement or some other date will be determined as of such
date, and (v) for such inaccuracies as, in the aggregate, would not have a Stel
Material Adverse Effect.

          (b)  Stel shall have performed and complied in all material respects
with all agreements, obligations and conditions required by this Agreement to be
performed or complied with by it on or prior to the Closing Date.

          (c)  Stel shall have furnished certificates of its officers to
evidence compliance with the conditions set forth in Sections 7.2(a) and (b) of
this Agreement.

          (d) Newbridge and Merger Sub shall have received an opinion of Heller
Ehrman White & McAuliffe, counsel to Newbridge and Merger Sub, dated as of the
Closing Date, substantially to the effect that on the basis of the facts,
representations and assumptions set forth in such opinions, (i) the Merger will
be treated as a reorganization within the meaning of Section 368(a) of the Code;
(ii) each of Newbridge, Merger Sub and Stel will be a party to such
reorganization within the meaning of Section 368(b) of the Code; and (iii)
except with respect to cash received in lieu of fractional share interests in
Newbridge Common Stock, no gain or loss will be recognized, for United States
federal income tax purposes, by a stockholder of Stel as a result of the Merger
with respect to the shares of Stel Common Stock converted into Newbridge Common
Stock.

          (e)  Any consents, approvals, notifications, disclosures, and filings
and registrations listed in Schedule 3.3 of the Stel Disclosure Statement shall
have been obtained or made.

          (f)  Stel shall have entered into binding agreements reasonably
acceptable to Newbridge with respect to the Non-core Asset Sale for an aggregate
purchase price which will result in after-tax net cash proceeds to Stel of not
less than U.S. $102,000,000.

          (g)  Stel shall have delivered to Newbridge a statement that the
interest in Stel is not a United States real property interest as contemplated
by Section 1.1445-2(c)(3) of the regulations promulgated under the Code.

                                       54


          (h)  Stel shall have entered into employment agreements or achieved
retention arrangements which are satisfactory to Newbridge with Stel employees
listed on Schedule 7.1(h).

          (i)  Stel shall have delivered to Newbridge the resignations of such
directors and officers of Stel and its Subsidiaries as Newbridge shall specify
at least ten days prior to the Closing, effective at the Effective Time.

          (j)  The aggregate number of shares of Stel Common Stock demanding or
purporting to demand appraisal rights under Section 262 of the Delaware Law
shall not exceed 10% of the outstanding shares of Stel Common Stock immediately
prior to the Effective Time.

          (k)  There shall not have occurred, since the date hereof, any Stel
Material Adverse Effect, except for the occurrence of conditions specifically
excepted in clauses (i) and (ii) of Section 7.2(a) hereof.

                                 ARTICLE VIII

                                  TERMINATION



     8.1  Termination.  This Agreement may be terminated at any time prior to
the Effective Time, whether before or after the requisite approval of the
stockholders of Stel:

          (a)  by mutual written consent duly authorized by the boards of
directors of Newbridge, Stel and Merger Sub;

          (b)  by either Stel or Newbridge if the Merger shall not have been
consummated by January 31, 2000 (the "End Date"), which date may be extended by
mutual consent of the parties hereto; provided, however, that the right to
terminate this Agreement under this Section 8.1(b) shall not be available to any
party whose action or failure to act has proximately contributed to the failure
of the Merger to occur on or before such date and such action or failure to act
constitutes a material breach of this Agreement;

          (c)  by either Stel or Newbridge if (i) a statute, rule, regulation or
executive order shall have been enacted, entered or promulgated prohibiting the
consummation of the Merger substantially on the terms contemplated hereby or
(ii) a court of competent jurisdiction or other Government Entity shall have
issued an order, decree, ruling or injunction, or taken any other action, having
the effect of permanently restraining, enjoining or otherwise prohibiting the
Merger substantially on the terms contemplated hereby, and such order, decree,
ruling, injunction or other action shall have become final and non-appealable;
provided, that a party shall not be permitted to
- --------

                                       55


terminate this Agreement pursuant to this Section 8.1(c) unless such party shall
have used its reasonable efforts to remove such order, decree, ruling or
injunction;

          (d)  by either Stel or Newbridge if the required approval of the
stockholders of Stel contemplated by this Agreement shall not have been obtained
by reason of the failure to obtain the required vote at a meeting of Stel
stockholders duly convened therefore or at any adjournment thereof; provided,
however, that the right to terminate this Agreement under this Section 8.1(d)
shall not be available to Stel where (i) Stel shall have breached in any
material respect its obligations under this Agreement in any manner that shall
have proximately contributed to the failure to obtain such stockholder approval
(it being specifically understood that a withholding, withdrawal, amendment or
modification of the board of directors recommendation to Stel stockholders to
vote in favor of and approve and adopt this Agreement and approve the Merger in
accordance with the conditions of Section 5.4(c) is not a breach of this
Agreement) or (ii) such failure was caused by a breach of any Voting Agreement
by a party thereto other than Newbridge;

          (e)  by Newbridge if a Stel Triggering Event (as defined below) shall
have occurred;

          (f)  by Stel if (i) the Newbridge Closing Value is less than $24.00
per share, (ii) Newbridge does not exercise the Newbridge Adjustment Option or,
if after Newbridge exercises such option, the Exchange Ratio is still less than
the quotient obtained by dividing U.S. $30.00 by the Newbridge Closing Value,
and (iii) Stel delivers a written termination notice prior to the close of
business on the trading day immediately prior to the Stel Special Meeting.

          (g)  by Stel, if there exists a breach or breaches of any
representation or warranty of Newbridge or Merger Sub contained in this
Agreement such that the Closing condition set forth in Section 7.1(a) or Section
7.1(b) would not be satisfied; provided, however, that if such breach or
                               --------  -------
breaches are capable of being cured prior to the Effective Time such that such
condition would be satisfied, then Stel shall not be permitted to terminate this
Agreement pursuant to this Section 8.3(g) unless Stel shall have delivered to
Newbridge written notice of such breach or breaches and such breach or breaches
shall not have been so cured within 30 days after delivery to Newbridge of such
written notice; provided, further, that Stel shall not be permitted to terminate
                -----------------
this Agreement pursuant to this Section 8.3(g) if Stel shall have breached in
any material respect its obligations under this Agreement in any manner that
shall have proximately caused such breach or breaches of Newbridge; or

          (h)  by Newbridge, if there exists a breach or breaches of any
representation or warranty of Stel contained in this Agreement such that the
Closing condition set forth in Section 7.2(a) or 7.2(b) would not be satisfied;

provided, however, that if such breach or breaches are capable of being cured
- --------  -------
prior to the Effective Time such

                                       56


that such condition would be satisfied, then Newbridge shall not be permitted to
terminate this Agreement pursuant to this Section 8.1(h) unless Newbridge shall
have delivered to Stel written notice of such breach or breaches and such breach
or breaches shall not have been so cured within 30 days after delivery to Stel
of such written notice; provided, further that Newbridge shall not be permitted
                        --------  -------
to terminate this Agreement pursuant to this Section 8.2(h) if Newbridge shall
have breached in any material respect its obligations under this Agreement in
any manner that shall have proximately caused such breach or breaches of Stel.

          (i)  For the purposes of this Agreement, a "Stel Triggering Event"
shall be deemed to have occurred if: (i) the board of directors of Stel or any
committee thereof shall for any reason have withdrawn or shall have amended or
modified in a manner adverse to Newbridge its unanimous recommendation in favor
of, the adoption and approval of the Agreement or the approval of the Merger;
(ii) Stel shall have failed to include or maintain in the Prospectus/Proxy
Statement the unanimous recommendation of the board of directors of Stel in
favor of the adoption and approval of the Agreement and the approval of the
Merger; (iii) the board of directors of Stel shall have failed to reaffirm its
unanimous recommendation in favor of the adoption and approval of the Agreement
and the approval of the Merger within five days after Newbridge requests in
writing that such recommendation be reaffirmed; (iv) the board of directors of
Stel or any committee thereof shall have failed to reject any Acquisition
Proposal; (v) Stel shall have entered into any letter or intent or similar
document or any agreement or commitment contemplating or otherwise relating to
an Acquisition Proposal; (vi) subject to Stel's ability to adjourn or postpone a
meeting pursuant to the third sentence of Section 5.4(a), Stel shall have failed
to hold the Stel Special Meeting as promptly as practicable and in any event (to
the extent permissible under applicable law) within 45 days after the
declaration of the effectiveness of the Registration Statement; (vii) a tender
or exchange offer relating to securities of Stel shall have been commenced by a
Person unaffiliated with Newbridge and Stel shall not have sent to its security
holders pursuant to Rule 14e-2 promulgated under the Securities Act, within ten
business days after such tender or exchange offer is first published, sent or
given, a statement disclosing that the board of directors of Stel recommends
rejection of such tender or exchange offer; or (viii) Stel shall have breached
any of its obligations under Section 5.2 of this Agreement.

     8.2  Notice of Termination; Effect of Termination. Any termination of this
Agreement under Section 8.1 will be effective immediately upon the delivery of a
valid written notice of the terminating party to the other parties hereto. In
the event of the termination of this Agreement as provided in Section 8.1, this
Agreement shall be of no further force or effect, except (i) as set forth in the
last sentence of Section 5.3, this Section 8.2, Section 8.3, Sections 9.4, 9.5,
9.6, 9.10, 9.11 and 9.12, each of which shall survive the termination of this
Agreement, and (ii) nothing herein shall relieve any party from liability for
any willful breach of this Agreement. No termination of this Agreement shall
affect the obligations of the parties contained in the Confidentiality
Agreement, the

                                       57


Stock Option Agreement or the Technology Option Agreement, all of which
obligations shall survive termination of this Agreement in accordance with their
terms.

     8.3  Fees and Expenses.

          (a) General.  Except as set forth in this Section 8.3, all fees and
expenses incurred in connection with this Agreement and the transactions
contemplated hereby shall be paid by the party incurring such expenses whether
or not the Merger is consummated; provided, however, that Newbridge and Stel
shall share equally all fees and expenses, other than attorneys' and
accountants' fees and expenses, incurred in relation to the printing and filing
(with the SEC) of the Prospectus/Proxy Statement (including any preliminary
materials related thereto) and the Registration Statement (including financial
statements and exhibits) and any amendments or supplements thereto.

          (b)  Stel Payments.

               (i)   In the event that this Agreement is terminated by Newbridge
pursuant to Section 8.1(e), Stel shall promptly, but in no event later than ten
business days after the date of such termination, pay Newbridge a nonrefundable
fee equal to U.S. $25 million in immediately available funds (the "Termination
Fee").

               (ii)  In the event that this Agreement is terminated by Newbridge
or Stel, as applicable, pursuant to Section 8.1 (b) or (d), (A) Stel shall pay
Newbridge the Termination Fee only if following the date hereof and prior to the
termination of this Agreement, a Third Party has publicly announced an
Acquisition Proposal and within 12 months following the termination of this
Agreement, Stel executes with a Third Party an agreement providing for an
Acquisition Transaction or an Acquisition Transaction has been consummated and
(B) such payment shall be made promptly, but in no event later than ten business
days after the execution of such agreement.

               (iii) In the event that this Agreement is terminated by Newbridge
or Stel pursuant to Section 8.1(d) and Stel is not required to pay Newbridge the
Termination Fee, Stel shall reimburse Newbridge for all documented expenses
incurred by Newbridge in connection with this Agreement, the Stock Option
Agreement, the Technology Option Agreement and the transactions contemplated
hereby (the "Newbridge Expenses") in immediately available funds not later than
ten business days after the first anniversary of the execution of this
Agreement.

               (iv)  In the event that this Agreement is terminated by Newbridge
pursuant to Section 8.1(h) because the Closing condition set forth in Section
7.2(b) is not satisfied, Stel shall promptly, but in no event later than ten
business days after the date of such termination, reimburse Newbridge for the
Newbridge Expenses in immediately available funds.

                                       58


               (v)   Stel acknowledges that the agreements contained in this
Section 8.3(b) are an integral part of the transactions contemplated by this
Agreement, and that, without these agreements, Newbridge would not enter into
this Agreement; accordingly, if Stel fails to pay in a timely manner the amounts
due pursuant to this Section 8.3(b), and, in order to obtain such payment,
Newbridge makes a claim that results in a judgment against Stel for the amounts
set forth in this Section 8.3(b), Stel shall pay to Newbridge its reasonable
costs and expenses (including reasonable attorneys' fees and expenses) in
connection with such suit, together with interest on the amounts set forth in
this Section 8.3(b) at the prime rate of The Chase Manhattan Bank in effect on
the date such payment was required to be made. Payment of the fees described in
this Section 8.3(b) shall not be in lieu of damages incurred in the event of
breach of this Agreement.

                                  ARTICLE IX

                                 MISCELLANEOUS


     9.1  Amendment and Modification. Subject to applicable law, this Agreement
may be amended, modified or supplemented only by written agreement of Newbridge,
Merger Sub and Stel at any time prior to the Effective Time; provided, however,
that after approval of this Agreement by the stockholders of Stel, no such
amendment or modification shall change the amount or form of the consideration
to be received by Stel's stockholders in the Merger.

     9.2  Waiver of Compliance; Consents. Any failure of Newbridge or Merger
Sub, on the one hand, or Stel, on the other hand, to comply with any obligation,
covenant, agreement or condition herein may be waived by Stel or Newbridge or
Merger Sub, respectively, only by a written instrument signed by the party
granting such waiver, but such waiver or failure to insist upon strict
compliance with such obligation, covenant, agreement or condition shall not
operate as a waiver of, or estoppel with respect to, any subsequent or other
failure. Whenever this Agreement requires or permits consent by or on behalf of
any party hereto, such consent shall be given in writing in a manner consistent
with the requirements for a waiver of compliance as set forth in this Section
9.2.

     9.3  Survival; Investigations. The respective representations and
warranties of Newbridge, Merger Sub and Stel contained herein or in any
certificates or other documents delivered prior to or at the Closing shall not
be deemed waived or otherwise affected by any investigation made by any party
hereto and shall not survive the Effective Time.

     9.4  Notices.  All notices and other communications hereunder shall be in
writing and shall be delivered personally by overnight courier or similar means
or sent by facsimile with written confirmation of receipt, to the parties at the
addresses specified

                                       59


below (or at such other address for a party as shall be specified by like
notice. Any such notice shall be effective upon receipt, if personally delivered
or on the next business day following transmittal if sent by confirmed
facsimile. Notices, including oral notices, shall be delivered as follows:

                  if to Stel, to:   Stanford Telecommunications, Inc.
                                    1221 Crossman Avenue
                                    P.O. Box 3733
                                    Sunnyvale, California 94089
                                    Telephone: (408) 735-0818
                                    Facsimile: (408) 745-2410
                                    Attention: Gary Wolf

                  with a copy to:   Thelen Reid & Priest LLP
                                    333 West San Carlos Street, 17th Floor
                                    San Jose, California  95110-2701
                                    Telephone:  (408) 292-5800
                                    Facsimile:  (408) 287-8040
                                    Attention: Jay L. Margulies

 to Newbridge, or Merger Sub, to:  Newbridge Networks Corporation
                                    600 March Road, P.O. Box 13600
                                    Kanata, Ontario, Canada K2K 2E6
                                    Telephone: (613) 591-3600
                                    Facsimile: (613) 599-3672
                                    Attention: Peter Nadeau

                  with a copy to:   Heller Ehrman White & McAuliffe
                                    525 University Avenue
                                    Palo Alto, California  94301
                                    Telephone: (650) 324-7000
                                    Facsimile: (650) 324-0638
                                    Attention:  Stephen C. Ferruolo
                                    (Matter #21969-0009)

     9.5  Assignment; Third Party Beneficiaries. Neither this Agreement nor any
right, interest or obligation hereunder shall be assigned by any of the parties
hereto without the prior written consent of the other parties. This Agreement
shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and permitted assigns. This Agreement is not intended to
confer any rights or remedies upon any Person other than the parties hereto,
with respect only to Section 5.8, the officers and directors of Stel, or as
otherwise expressly provided herein.

                                       60


     9.6  Governing Law. This Agreement shall be governed by the laws of the
State of Delaware without reference to principles of conflicts of laws.

     9.7  Counterparts. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

     9.8  Severability. In case any one or more of the provisions contained in
this Agreement should be finally determined to be invalid, illegal or
unenforceable in any respect against a party hereto, it shall be adjusted if
possible to effect the intent of the parties. In any event, the validity,
legality and enforceability of the remaining provisions contained herein shall
not in any way be affected or impaired thereby, and such invalidity, illegality
or unenforceability shall only apply as to such party in the specific
jurisdiction where such final determination shall have been made.

     9.9  Interpretation. The Article and Section headings contained in this
Agreement are solely for the purpose of reference and shall not in any way
affect the meaning or interpretation of this Agreement.

     9.10 Entire Agreement. This Agreement, including the exhibits hereto and
the documents and instruments referred to herein, embody the entire agreement
and understanding of the parties hereto in respect of the subject matter
contained herein. There are no representations, promises, warranties, covenants,
or undertakings, other than those expressly set forth or referred to herein and
therein.

     9.11 Definition of "law".  When used in this Agreement "law" refers to any
applicable law (whether civil, criminal or administrative) including, without
limitation, common law, statute, statutory instrument, treaty, regulation,
directive, decision, code, order, decree, injunction, resolution or judgment of
any government, quasi-government, supranational, federal, state or local
government, statutory or regulatory body, court, or agency.

     9.12 Rules of Construction.  Each party to this Agreement has been
represented by counsel during the preparation and execution of this Agreement,
and therefore waives any rule of construction that would construe ambiguities
against the party drafting the agreement.

                                       61


     IN WITNESS WHEREOF, Newbridge Networks Corporation, Saturn Acquisition
Corp. and Stanford Telecommunications, Inc. have caused this Agreement to be
signed by their respective duly authorized officers as of the date first above
written.

                               NEWBRIDGE NETWORKS CORPORATION



                               By: /s/ Alan G. Lutz
                                  ----------------
                               Title:  President and Chief Operating Officer
                                       -------------------------------------


                               By: /s/ Peter Nadeau
                                   ----------------
                               Title:  Vice President and General Counsel
                                       ----------------------------------


                               SATURN ACQUISITION CORP.


                               By:/s/ Peter Nadeau
                                  ----------------
                               Title:  President, Treasurer and Secretary
                                       ----------------------------------


                               STANFORD TELECOMMUNICATIONS, INC.

                               By: /s/ Val P. Peline
                                   -----------------
                               Title:  President and Chief Executive Officer
                                       -------------------------------------


                               By: /s/ James J. Spilker, Jr.
                                  --------------------------
                               Title:  Chairman
                                       --------

                                       62