1
                                                                     EXHIBIT 1.1

                                8,500,000 SHARES

                            UNISPHERE NETWORKS, INC.

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE


                             UNDERWRITING AGREEMENT


                                                                     _____, 2001


CREDIT SUISSE FIRST BOSTON CORPORATION
J.P. MORGAN SECURITIES INC.
UBS WARBURG LLC
  As Representatives of the Several Underwriters,
    c/o Credit Suisse First Boston Corporation,
         Eleven Madison Avenue,
           New York, N.Y. 10010-3629

Dear Sirs:

     1.   Introductory. Unisphere Networks, Inc., a Delaware corporation
("COMPANY"), proposes to issue and sell 8,500,000 shares ("FIRM SECURITIES") of
its Common Stock, par value $0.01 per share ("SECURITIES"), and also proposes to
issue and sell to the Underwriters, at the option of the Underwriters, an
aggregate of not more than 1,275,000 additional shares ("OPTIONAL SECURITIES")
of its Securities as set forth below. The Firm Securities and the Optional
Securities are herein collectively called the "OFFERED SECURITIES". As part of
the offering contemplated by this Agreement, Credit Suisse First Boston
Corporation (the "DESIGNATED UNDERWRITER") has agreed to reserve out of the Firm
Securities purchased by it under this Agreement, up to 550,000 shares, for sale
to the Company's directors, officers, employees and other parties associated
with the Company (collectively, "PARTICIPANTS"), as set forth in the Prospectus
(as defined herein) under the heading "Underwriting" (the "Directed SHARE
PROGRAM"). The Firm Securities to be sold by the Designated Underwriter pursuant
to the Directed Share Program (the "DIRECTED SHARES") will be sold by the
Designated Underwriter pursuant to this Agreement at the public offering price.
Any Directed Shares not subscribed for by the end of the business day on which
this Agreement is executed will be offered to the public by the Underwriters as
set forth in the Prospectus. The Company hereby agrees with the several
Underwriters named in Schedule A hereto ("UNDERWRITERS") as follows:

     2.   Representations and Warranties of the Company. The Company represents
and warrants to, and agrees with, the several Underwriters that:

          (a)  A registration statement (No. 333-43144) relating to the Offered
     Securities, including a form of prospectus, has been filed with the
     Securities and Exchange Commission ("COMMISSION") and either (i) has been
     declared effective under the Securities Act of 1933 ("ACT") and is not
     proposed to be amended or (ii) is proposed to be amended by amendment or
     post-effective amendment. If such registration statement ("INITIAL
     REGISTRATION STATEMENT") has been declared effective, either (i) an
     additional registration statement ("ADDITIONAL REGISTRATION STATEMENT")
     relating to the Offered Securities may have been filed with the Commission
     pursuant

   2

     to Rule 462(b) ("RULE 462(b)") under the Act and, if so filed, has become
     effective upon filing pursuant to such Rule and the Offered Securities all
     have been duly registered under the Act pursuant to the initial
     registration statement and, if applicable, the additional registration
     statement or (ii) such an additional registration statement is proposed to
     be filed with the Commission pursuant to Rule 462(b) and will become
     effective upon filing pursuant to such Rule and upon such filing the
     Offered Securities will all have been duly registered under the Act
     pursuant to the initial registration statement and such additional
     registration statement. If the Company does not propose to amend the
     initial registration statement or if an additional registration statement
     has been filed and the Company does not propose to amend it, and if any
     post-effective amendment to either such registration statement has been
     filed with the Commission prior to the execution and delivery of this
     Agreement, the most recent amendment (if any) to each such registration
     statement has been declared effective by the Commission or has become
     effective upon filing pursuant to Rule 462(c) ("RULE 462(c)") under the Act
     or, in the case of the additional registration statement, Rule 462(b). For
     purposes of this Agreement, "EFFECTIVE TIME" with respect to the initial
     registration statement or, if filed prior to the execution and delivery of
     this Agreement, the additional registration statement means (i) if the
     Company has advised the Representatives that it does not propose to amend
     such registration statement, the date and time as of which such
     registration statement, or the most recent post-effective amendment thereto
     (if any) filed prior to the execution and delivery of this Agreement, was
     declared effective by the Commission or has become effective upon filing
     pursuant to Rule 462(c), or (ii) if the Company has advised the
     Representatives that it proposes to file an amendment or post-effective
     amendment to such registration statement, the date and time as of which
     such registration statement, as amended by such amendment or post-effective
     amendment, as the case may be, is declared effective by the Commission. If
     an additional registration statement has not been filed prior to the
     execution and delivery of this Agreement but the Company has advised the
     Representatives that it proposes to file one, "EFFECTIVE TIME" with respect
     to such additional registration statement means the date and time as of
     which such registration statement is filed and becomes effective pursuant
     to Rule 462(b). "EFFECTIVE DATE" with respect to the initial registration
     statement or the additional registration statement (if any) means the date
     of the Effective Time thereof. The initial registration statement, as
     amended at its Effective Time, including all information contained in the
     additional registration statement (if any) and deemed to be a part of the
     initial registration statement as of the Effective Time of the additional
     registration statement pursuant to the General Instructions of the Form on
     which it is filed and including all information (if any) deemed to be a
     part of the initial registration statement as of its Effective Time
     pursuant to Rule 430A(b) ("RULE 430A(b)") under the Act, is hereinafter
     referred to as the "INITIAL REGISTRATION STATEMENT". The additional
     registration statement, as amended at its Effective Time, including the
     contents of the initial registration statement incorporated by reference
     therein and including all information (if any) deemed to be a part of the
     additional registration statement as of its Effective Time pursuant to Rule
     430A(b), is hereinafter referred to as the "ADDITIONAL REGISTRATION
     STATEMENT". The Initial Registration Statement and the Additional
     Registration Statement are herein referred to collectively as the
     "REGISTRATION STATEMENTS" and individually as a "REGISTRATION STATEMENT".
     The form of prospectus relating to the Offered Securities, as first filed
     with the Commission pursuant to and in accordance with Rule 424(b) ("RULE
     424(b)") under the Act or (if no such filing is required) as included in a
     Registration Statement, is hereinafter referred to as the "PROSPECTUS". No
     document has been or will be prepared or distributed in reliance on Rule
     434 under the Act.

          (b)  If the Effective Time of the Initial Registration Statement is
     prior to the execution and delivery of this Agreement: (i) on the Effective
     Date of the Initial Registration Statement, the Initial Registration
     Statement conformed in all material respects to the requirements of the Act
     and the rules and regulations of the Commission ("RULES AND REGULATIONS")
     and did not include any untrue statement of a material fact or omit to
     state any

                                       2
   3

     material fact required to be stated therein or necessary to make the
     statements therein not misleading, (ii) on the Effective Date of the
     Additional Registration Statement (if any), each Registration Statement
     conformed, or will conform, in all material respects to the requirements of
     the Act and the Rules and Regulations and did not include, or will not
     include, any untrue statement of a material fact and did not omit, or will
     not omit, to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading and (iii) on the
     date of this Agreement, the Initial Registration Statement and, if the
     Effective Time of the Additional Registration Statement is prior to the
     execution and delivery of this Agreement, the Additional Registration
     Statement each conforms, and at the time of filing of the Prospectus
     pursuant to Rule 424(b) or (if no such filing is required) at the Effective
     Date of the Additional Registration Statement in which the Prospectus is
     included, each Registration Statement and the Prospectus will conform, in
     all material respects to the requirements of the Act and the Rules and
     Regulations, and neither of such documents includes, or will include, any
     untrue statement of a material fact or omits, or will omit, to state any
     material fact required to be stated therein or necessary to make the
     statements therein not misleading. If the Effective Time of the Initial
     Registration Statement is subsequent to the execution and delivery of this
     Agreement: on the Effective Date of the Initial Registration Statement, the
     Initial Registration Statement and the Prospectus will conform in all
     material respects to the requirements of the Act and the Rules and
     Regulations, neither of such documents will include any untrue statement of
     a material fact or will omit to state any material fact required to be
     stated therein or necessary to make the statements therein not misleading,
     and no Additional Registration Statement has been or will be filed. The two
     preceding sentences do not apply to statements in or omissions from a
     Registration Statement or the Prospectus based upon written information
     furnished to the Company by any Underwriter through the Representatives
     specifically for use therein, it being understood and agreed that the only
     such information is that described as such in Section 7(b) hereof.

          (c)  The Company has been duly incorporated and is an existing
     corporation in good standing under the laws of the State of Delaware, with
     power and authority (corporate and other) to own its properties and conduct
     its business as described in the Prospectus; and the Company is duly
     qualified to do business as a foreign corporation in good standing in all
     other jurisdictions in which its ownership or lease of property or the
     conduct of its business requires such qualification, except where the
     failure to be so qualified would not have a material adverse effect on the
     condition (financial or other), business, properties or results of
     operations of the Company and its subsidiaries taken as a whole ("MATERIAL
     ADVERSE EFFECT").

          (d)  Each subsidiary of the Company has been duly incorporated and is
     an existing corporation in good standing under the laws of the jurisdiction
     of its incorporation, with power and authority (corporate and other) to own
     its properties and conduct its business as described in the Prospectus; and
     each subsidiary of the Company is duly qualified to do business as a
     foreign corporation in good standing in all other jurisdictions in which
     its ownership or lease of property or the conduct of its business requires
     such qualification, except where the failure to be so qualified would not
     have a Material Adverse Effect; all of the issued and outstanding capital
     stock of each subsidiary of the Company has been duly authorized and
     validly issued and is fully paid and nonassessable; and the capital stock
     of each subsidiary owned by the Company, directly or through subsidiaries,
     is owned free from liens, encumbrances and defects.

          (e)  The Offered Securities and all other outstanding shares of
     capital stock of the Company have been duly authorized; all outstanding
     shares of capital stock of the Company are, and, when the Offered
     Securities have been delivered and paid for in accordance with this
     Agreement on each Closing Date (as defined below), such Offered Securities
     will have been, validly issued, fully paid and nonassessable and will
     conform to the description thereof contained

                                       3
   4

     in the Prospectus; and the stockholders of the Company have no preemptive
     rights with respect to the Securities.

          (f)  Except as disclosed in the Prospectus, there are no contracts,
     agreements or understandings between the Company and any person that would
     give rise to a valid claim against the Company or any Underwriter for a
     brokerage commission, finder's fee or other like payment in connection with
     this offering.

          (g)  Except as disclosed in the Prospectus, there are no contracts,
     agreements or understandings between the Company and any person granting
     such person the right to require the Company to file a registration
     statement under the Act with respect to any securities of the Company owned
     or to be owned by such person or to require the Company to include such
     securities in the securities registered pursuant to a Registration
     Statement or in any securities being registered pursuant to any other
     registration statement filed by the Company under the Act.

          (h)  The Offered Securities have been approved for listing on The
     Nasdaq Stock Market's National Market subject to notice of issuance.

          (i)  No consent, approval, authorization, or order of, or filing with,
     any governmental agency or body or any court is required for the
     consummation of the transactions contemplated by this Agreement in
     connection with the issuance and sale of the Offered Securities by the
     Company, except such as have been obtained and made under the Act and such
     as may be required under state securities laws.

          (j)  The execution, delivery and performance of this Agreement, and
     the issuance and sale of the Offered Securities will not result in a breach
     or violation of any of the terms and provisions of, or constitute a default
     under, any statute, any rule, regulation or order of any governmental
     agency or body or any court, domestic or foreign, having jurisdiction over
     the Company or any subsidiary of the Company or any of their properties, or
     any material agreement or instrument to which the Company or any such
     subsidiary is a party or by which the Company or any such subsidiary is
     bound or to which any of the properties of the Company or any such
     subsidiary is subject, or the charter or by-laws of the Company or any such
     subsidiary, and the Company has full power and authority to authorize,
     issue and sell the Offered Securities as contemplated by this Agreement.

          (k)  This Agreement has been duly authorized, executed and delivered
     by the Company.

          (l)  Except as disclosed in the Prospectus, the Company and its
     subsidiaries have good and marketable title to all real properties and all
     other properties and assets owned by them, in each case free from liens,
     encumbrances and defects that would materially affect the value thereof or
     materially interfere with the use made or to be made thereof by them; and
     except as disclosed in the Prospectus, the Company and its subsidiaries
     hold any leased real or personal property under valid and enforceable
     leases with no exceptions that would materially interfere with the use made
     or to be made thereof by them.

          (m)  The Company and its subsidiaries possess adequate certificates,
     authorities or permits issued by appropriate governmental agencies or
     bodies necessary to conduct the business now operated by them and have not
     received any notice of proceedings relating to the revocation or
     modification of any such certificate, authority or permit that, if
     determined adversely to the

                                       4
   5
     Company or any of its subsidiaries, would individually or in the aggregate
     have a Material Adverse Effect.

          (n)  No labor dispute with the employees of the Company or any
     subsidiary exists or, to the knowledge of the Company, is imminent that
     might have a Material Adverse Effect.

          (o)  The Company and its subsidiaries own, possess, have valid
     licenses or rights to use, or can acquire, or acquire valid licenses or
     rights to use, on reasonable terms, adequate trademarks, trade names and
     other rights to inventions, know-how, patents, copyrights, confidential
     information and other intellectual property (collectively, "INTELLECTUAL
     PROPERTY RIGHTS") necessary to conduct the business now operated by them,
     or presently employed by them, and have not received any notice of
     infringement of or conflict with asserted rights of others with respect to
     any intellectual property rights that, if determined adversely to the
     Company or any of its subsidiaries, would individually or in the aggregate
     have a Material Adverse Effect.

          (p)  Except as disclosed in the Prospectus, neither the Company nor
     any of its subsidiaries is in violation of any statute, any rule,
     regulation, decision or order of any governmental agency or body or any
     court, domestic or foreign, relating to the use, disposal or release of
     hazardous or toxic substances or relating to the protection or restoration
     of the environment or human exposure to hazardous or toxic substances
     (collectively, "ENVIRONMENTAL LAWS"), owns or operates any real property
     contaminated with any substance that is subject to any environmental laws,
     is liable for any off-site disposal or contamination pursuant to any
     environmental laws, or is subject to any claim relating to any
     environmental laws, which violation, contamination, liability or claim
     would individually or in the aggregate have a Material Adverse Effect; and
     the Company is not aware of any pending investigation which might lead to
     such a claim.

          (q)  Except as disclosed in the Prospectus, there are no pending
     actions, suits or proceedings against or affecting the Company, any of the
     subsidiaries of the Company or any of their respective properties that, if
     determined adversely to the Company or any of the subsidiaries of the
     Company, would individually or in the aggregate have a Material Adverse
     Effect, or would materially and adversely affect the ability of the Company
     to perform its obligations under this Agreement, or which are otherwise
     material in the context of the sale of the Offered Securities; and no such
     actions, suits or proceedings are to the Company's knowledge threatened.

          (r)  The financial statements included in each Registration Statement
     and the Prospectus present fairly the financial position of the Company and
     its consolidated subsidiaries as of the dates shown and their results of
     operations and cash flows for the periods shown, and such financial
     statements have been prepared in conformity with the generally accepted
     accounting principles in the United States applied on a consistent basis;
     and the schedules included in each Registration Statement present fairly
     the information required to be stated therein.

          (s)  Except as disclosed in the Prospectus, since the date of the
     latest audited financial statements included in the Prospectus there has
     been no material adverse change, nor any development or event involving a
     prospective material adverse change, in the condition (financial or other),
     business, properties or results of operations of the Company and its
     subsidiaries taken as a whole, and, except as disclosed in or contemplated
     by the Prospectus, there has been no dividend or distribution of any kind
     declared, paid or made by the Company on any class of its capital stock.

                                       5
   6

          (t)  The Company is not and, after giving effect to the offering and
     sale of the Offered Securities and the application of the proceeds thereof
     as described in the Prospectus, will not be an "investment company" as
     defined in the Investment Company Act of 1940.

          (u)  Neither the Company, nor any of its affiliates, has taken,
     directly or indirectly, any action designed to cause or result in, or which
     has constituted or which might reasonably be expected to constitute, the
     stabilization or manipulation of the price of the shares of the Securities
     to facilitate the sale or resale of the Offered Securities.

          (v)  Neither the Company nor any of its affiliates does business with
     the government of Cuba or with any person or affiliate located in Cuba
     within the meaning of Section 517.075, Florida Statutes and the Company
     agrees to comply with such Section if prior to the completion of the
     distribution of the Offered Securities it commences doing such business.

          (w)  To the knowledge of the Company, each of KPMG LLP,
     PricewaterhouseCoopers LLP and Arthur Andersen LLP, who have certified the
     financial statements filed with the Commission as part of each Registration
     Statement, are independent public accountants as required by the Act and
     the Rules and Regulations. The Company maintains a system of internal
     accounting controls sufficient to provide reasonable assurances that (A)
     transactions are executed in accordance with management's general or
     specific authorization; (B) transactions are recorded as necessary to
     permit preparation of financial statements in conformity with generally
     accepted accounting principles and to maintain accountability for assets;
     and (C) access to assets is permitted only in accordance with management's
     general or specific authorization.

          (x)  The Company and each of its subsidiaries carry, or are covered
     by, insurance in such amounts and covering such risks as is adequate for
     the conduct of their respective businesses and the value of their
     respective properties and as is customary for companies engaged in similar
     industries.

          (y)  The minute books of the Company made available to the
     Underwriters contain a complete summary of all meetings and actions of the
     directors and stockholders of the Company since the time of its
     incorporation and reflects accurately and fairly in all respects all
     transactions referred to in such minutes.

          (z)  Furthermore, the Company represents and warrants to the
     Underwriters that (i) the Registration Statement, the Prospectus and any
     preliminary prospectus comply, and any further amendments or supplements
     thereto will comply, with any applicable laws or regulations of foreign
     jurisdictions in which the Prospectus or any preliminary prospectus, as
     amended or supplemented, if applicable, are distributed in connection with
     the Directed Share Program, and that (ii) no authorization, approval,
     consent, license, order, registration or qualification of or with any
     government, governmental instrumentality or court, other than such as have
     been obtained, is necessary under the securities law and regulations of
     foreign jurisdictions in which the Directed Shares are offered outside the
     United States.

          (aa) The Company has not offered, or caused the Underwriters to offer,
     any offered Securities to any person pursuant to the Directed Share Program
     with the specific intent to unlawfully influence (i) a customer or supplier
     of the Company to alter the customer's or supplier's level or type of
     business with the Company or (ii) a trade journalist or publication to
     write or publish favorable information about the Company or its products.

                                       6
   7

          (bb) The Agreement and Plan of Merger dated October 20, 2000 (the
     "MERGER AGREEMENT") by and between the Company and BroadSoft, Inc., a
     Delaware corporation, has been duly authorized by all necessary board of
     directors action on the part of the Company and has been duly executed and
     delivered by the Company. The execution and delivery of the Plan of Merger
     and the consummation of the merger as contemplated thereby will not result
     in a breach or violation of any of the terms and provisions of, or
     constitute a default under, any statute, any rule, regulation or order of
     any governmental agency or body or any court, domestic or foreign, having
     jurisdiction over the Company or any subsidiary of the Company or any of
     their properties, or any material agreement or instrument to which the
     Company or any such subsidiary is a party or by which the Company or any
     such subsidiary is bound or to which any of the properties of the Company
     or any such subsidiary is subject, or the charter or by-laws of the Company
     or any such subsidiary, and the Company has full power and authority to
     perform its obligations as contemplated by the Merger Agreement.

     3.   Purchase, Sale and Delivery of Offered Securities. On the basis of the
representations, warranties and agreements herein contained, but subject to the
terms and conditions herein set forth, the Company agrees to sell to the
Underwriters, and the Underwriters agree, severally and not jointly, to purchase
from the Company, at a purchase price of $     per share, the respective numbers
of shares of Firm Securities set forth opposite the names of the Underwriters in
Schedule A hereto.

     The Company will deliver the Firm Securities to the Representatives for the
accounts of the Underwriters, against payment of the purchase price in Federal
(same day) funds by official bank check or checks or wire transfer to an account
at a bank acceptable to Credit Suisse First Boston Corporation ("CSFBC") drawn
to the order of the Company at the office of Hale and Dorr LLP, 60 State Street,
Boston, Massachusetts 02109, at       A.M., New York time, on           , or at
such other time not later than seven full business days thereafter as CSFBC and
the Company determine, such time being herein referred to as the "FIRST CLOSING
Date". For purposes of Rule 15c6-1 under the Securities Exchange Act of 1934,
the First Closing Date (if later than the otherwise applicable settlement date)
shall be the settlement date for payment of funds and delivery of securities for
all the Offered Securities sold pursuant to the offering. The certificates for
the Firm Securities so to be delivered will be in definitive form, in such
denominations and registered in such names as CSFBC requests and will be made
available for checking and packaging at the above office of CSFBC at least 24
hours prior to the First Closing Date.

     In addition, upon written notice from CSFBC given to the Company from time
to time not more than 30 days subsequent to the date of the Prospectus, the
Underwriters may purchase all or less than all of the Optional Securities at the
purchase price per Security to be paid for the Firm Securities. The Company
agrees to sell to the Underwriters the number of shares of Optional Securities
specified in such notice and the Underwriters agree, severally and not jointly,
to purchase such Optional Securities. Such Optional Securities shall be
purchased for the account of each Underwriter in the same proportion as the
number of shares of Firm Securities set forth opposite such Underwriter's name
bears to the total number of shares of Firm Securities (subject to adjustment by
CSFBC to eliminate fractions) and may be purchased by the Underwriters only for
the purpose of covering over-allotments made in connection with the sale of the
Firm Securities. No Optional Securities shall be sold or delivered unless the
Firm Securities previously have been, or simultaneously are, sold and delivered.
The right to purchase the Optional Securities or any portion thereof may be
exercised from time to time and to the extent not previously exercised may be
surrendered and terminated at any time upon notice by CSFBC to the Company.

     Each time for the delivery of and payment for the Optional Securities,
being herein referred to as an "OPTIONAL CLOSING DATE", which may be the First
Closing Date (the First Closing Date and each Optional Closing Date, if any,
being sometimes referred to as a "CLOSING DATE"), shall be determined by CSFBC
but shall be not later than five full business days after written notice of
election to purchase Optional Securities is given. The Company will deliver the
Optional Securities being purchased on each

                                        7
   8

Optional Closing Date to the Representatives for the accounts of the several
Underwriters, against payment of the purchase price therefor in Federal (same
day) funds by official bank check or checks or wire transfer to an account at a
bank acceptable to CSFBC drawn to the order of the Company, at the above office
of Hale and Dorr LLP. The certificates for the Optional Securities being
purchased on each Optional Closing Date will be in definitive form, in such
denominations and registered in such names as CSFBC requests upon reasonable
notice prior to such Optional Closing Date and will be made available for
checking and packaging at the above office of CSFBC at a reasonable time in
advance of such Optional Closing Date.

     4.   Offering by Underwriters. It is understood that the several
Underwriters propose to offer the Offered Securities for sale to the public as
set forth in the Prospectus.

     5.   Certain Agreements of the Company. The Company agrees with the several
Underwriters that:

          (a)  If the Effective Time of the Initial Registration Statement is
     prior to the execution and delivery of this Agreement, the Company will
     file the Prospectus with the Commission pursuant to and in accordance with
     subparagraph (1) (or, if applicable and if consented to by CSFBC,
     subparagraph (4)) of Rule 424(b) not later than the earlier of (A) the
     second business day following the execution and delivery of this Agreement
     or (B) the fifteenth business day after the Effective Date of the Initial
     Registration Statement.

     The Company will advise CSFBC promptly of any such filing pursuant to Rule
     424(b). If the Effective Time of the Initial Registration Statement is
     prior to the execution and delivery of this Agreement and an additional
     registration statement is necessary to register a portion of the Offered
     Securities under the Act but the Effective Time thereof has not occurred as
     of such execution and delivery, the Company will file the additional
     registration statement or, if filed, will file a post-effective amendment
     thereto with the Commission pursuant to and in accordance with Rule 462(b)
     on or prior to 10:00 P.M., New York time, on the date of this Agreement or,
     if earlier, on or prior to the time the Prospectus is printed and
     distributed to any Underwriter, or will make such filing at such later date
     as shall have been consented to by CSFBC.

          (b)  The Company will advise CSFBC promptly of any proposal to amend
     or supplement the initial or any additional registration statement as filed
     or the related prospectus or the Initial Registration Statement, the
     Additional Registration Statement (if any) or the Prospectus and will not
     effect such amendment or supplementation without CSFBC's consent; and the
     Company will also advise CSFBC promptly of the effectiveness of each
     Registration Statement (if its Effective Time is subsequent to the
     execution and delivery of this Agreement) and of any amendment or
     supplementation of a Registration Statement or the Prospectus and of the
     institution by the Commission of any stop order proceedings in respect of a
     Registration Statement and will use its best efforts to prevent the
     issuance of any such stop order and to obtain as soon as possible its
     lifting, if issued.

          (c)  If, at any time when a prospectus relating to the Offered
     Securities is required to be delivered under the Act in connection with
     sales by any Underwriter or dealer, any event occurs as a result of which
     the Prospectus as then amended or supplemented would include an untrue
     statement of a material fact or omit to state any material fact necessary
     to make the statements therein, in the light of the circumstances under
     which they were made, not misleading, or if it is necessary at any time to
     amend the Prospectus to comply with the Act, the Company will promptly
     notify CSFBC of such event and will promptly prepare and file with the
     Commission, at its own expense, an amendment or supplement which will
     correct such statement or omission or an amendment which will effect such
     compliance. Neither CSFBC's consent to, nor the

                                       8
   9

     Underwriters' delivery of, any such amendment or supplement shall
     constitute a waiver of any of the conditions set forth in Section 6.

          (d)  No later than the Availability Date (as defined below), the
     Company will make generally available to its securityholders an earnings
     statement covering a period of at least 12 months beginning after the
     Effective Date of the Initial Registration Statement (or, if later, the
     Effective Date of the Additional Registration Statement) which will satisfy
     the provisions of Section 11(a) of the Act. For the purpose of the
     preceding sentence, "AVAILABILITY DATE" means the 45th day after the end of
     the fourth fiscal quarter following the fiscal quarter that includes such
     Effective Date, except that, if such fourth fiscal quarter is the last
     quarter of the Company's fiscal year, "AVAILABILITY DATE" means the 90th
     day after the end of such fourth fiscal quarter.

          (e)  The Company will furnish to the Representatives copies of each
     Registration Statement (four of which will be signed and will include all
     exhibits), each related preliminary prospectus, and, so long as a
     prospectus relating to the Offered Securities is required to be delivered
     under the Act in connection with sales by any Underwriter or dealer, the
     Prospectus and all amendments and supplements to such documents, in each
     case in such quantities as CSFBC requests. The Prospectus shall be so
     furnished on or prior to 3:00 P.M., New York time, on the business day
     following the later of the execution and delivery of this Agreement or the
     Effective Time of the Initial Registration Statement. All other documents
     shall be so furnished as soon as available. The Company will pay the
     expenses of printing and distributing to the Underwriters all such
     documents.

          (f)  The Company will arrange for the qualification of the Offered
     Securities for sale under the laws of such jurisdictions as CSFBC
     designates and will continue such qualifications in effect so long as
     required for the distribution.

          (g)  During the period of five years hereafter, the Company will
     furnish to the Representatives and, upon request, to each of the other
     Underwriters, as soon as practicable after the end of each fiscal year, a
     copy of its annual report to stockholders for such year; and the Company
     will furnish to the Representatives (i) as soon as available, a copy of
     each report and any definitive proxy statement of the Company filed with
     the Commission under the Securities Exchange Act of 1934 or mailed to
     stockholders, and (ii) from time to time, such other information concerning
     the Company as CSFBC may reasonably request.

          (h)  Other than as otherwise agreed, the Company will pay all expenses
     incident to the performance of its obligations under this Agreement, for
     any filing fees and other expenses (including fees and disbursements of
     counsel) incurred in connection with qualification of the Offered
     Securities for sale under the laws of such jurisdictions as CSFBC
     designates and the printing of memoranda relating thereto, for any fees
     charged by investment rating agencies for the rating of the Offered
     Securities, for the filing fee incident to, and the reasonable fees and
     disbursements of counsel to the Underwriters in connection with, the review
     by the National Association of Securities Dealers, Inc. of the Offered
     Securities, for any travel expenses of the Company's officers and employees
     and any other expenses of the Company in connection with attending or
     hosting meetings with prospective purchasers of the Offered Securities and
     for expenses incurred in distributing preliminary prospectuses and the
     Prospectus (including any amendments and supplements thereto) to the
     Underwriters.

          (i)  For a period of 180 days after the date of the initial public
     offering of the Offered Securities, the Company will not offer, sell,
     contract to sell, pledge or otherwise dispose of, directly or indirectly,
     or file with the Commission a registration statement under the Act relating
     to, any additional shares of its Securities or securities convertible into
     or exchangeable or

                                       9
   10

     exercisable for any shares of its Securities, or publicly disclose the
     intention to make any such offer, sale, pledge, disposition or filing,
     without the prior written consent of CSFBC, except (i) grants of employee
     stock options or restricted stock awards pursuant to the terms of a plan in
     effect on the date hereof, (ii) issuances of Securities pursuant to the
     exercise of such options or the exercise of any other employee stock
     options outstanding on the date hereof, or (iii) upon prior written notice
     to CSFBC, the Company's issuance of Securities in connection with a bona
     fide acquisition of another company pursuant to a definitive merger
     agreement executed and delivered by the Company and the other parties set
     forth therein prior to the date hereof and a copy of which has been made
     delivered to CSFBC prior to the date hereof, provided that the holders of
     the securities of the Company issued in connection with such transaction
     agree for a period of 180 days after the date of the initial public
     offering of the Offered Securities to not offer, sell, contract to sell,
     pledge or otherwise dispose of, directly or indirectly, any shares of
     Securities or securities convertible into or exchangeable or exercisable
     for any shares of Securities, or publicly disclose the intention to make
     any such offer, sale, pledge or disposition, without the prior written
     consent of CSFBC.

          (j)  The Company will not take, directly or indirectly, any action
     designed to cause or result in, or that has constituted or might reasonably
     be expected to constitute, the stabilization or manipulation of the price
     of any securities of the Company.

          (k)  In connection with the Directed Share Program, the Company will
     ensure that the Directed Shares will be restricted to the extent required
     by the National Association of Securities Dealers, Inc. (the "NASD") or the
     NASD rules from sale, transfer, assignment, pledge or hypothecation for a
     period of three months following the date of the effectiveness of the
     Registration Statement. The Designated Underwriter will notify the Company
     as to which Participants will need to be so restricted. The Company will
     direct the transfer agent to place stop transfer restrictions upon such
     securities for such period of time.

          (l)  Except as otherwise agreed, the Company will pay all fees and
     disbursements of counsel incurred by the Underwriters in connection with
     the Directed Shares Program and stamp duties, similar taxes or duties or
     other taxes, if any, incurred by the underwriters in connection with the
     Directed Share Program.

          Furthermore, the Company covenants with the Underwriters that the
     Company will comply with all applicable securities and other applicable
     laws, rules and regulations in each foreign jurisdiction in which the
     Directed Shares are offered in connection with the Directed Share Program.

     6.   Conditions of the Obligations of the Underwriters. The obligations of
the several Underwriters to purchase and pay for the Firm Securities on the
First Closing Date and the Optional Securities to be purchased on each Optional
Closing Date will be subject to the accuracy of the representations and
warranties on the part of the Company herein, to the accuracy of the statements
of Company officers made pursuant to the provisions hereof, to the performance
by the Company of its obligations hereunder and to the following additional
conditions precedent:

          (a)  The Representatives shall have received a letter, dated the date
     of delivery thereof (which, if the Effective Time of the Initial
     Registration Statement is prior to the execution and delivery of this
     Agreement, shall be on or prior to the date of this Agreement or, if the
     Effective Time of the Initial Registration Statement is subsequent to the
     execution and delivery of this Agreement, shall be prior to the filing of
     the amendment or post-effective amendment to the registration statement to
     be filed shortly prior to such Effective Time), of KPMG LLP confirming

                                       10
   11

     that they are independent public accountants within the meaning of the Act
     and the applicable published Rules and Regulations thereunder and stating
     to the effect that:

          (i)  in their opinion the financial statements and schedules examined
          by them and included in the Registration Statements comply as to form
          in all material respects with the applicable accounting requirements
          of the Act and the related published Rules and Regulations;

          (ii) they have performed the procedures specified by the American
          Institute of Certified Public Accountants for a review of interim
          financial information as described in Statement of Auditing Standards
          No. 71, Interim Financial Information, on the unaudited financial
          statements included in the Registration Statements;

          (iii) on the basis of the review referred to in clause (ii) above, a
          reading of the latest available interim financial statements of the
          Company, inquiries of officials of the Company who have responsibility
          for financial and accounting matters and other specified procedures,
          nothing came to their attention that caused them to believe that:

                    (A)  the unaudited financial statements included in the
               Registration Statements do not comply as to form in all material
               respects with the applicable accounting requirements of the Act
               and the related published Rules and Regulations or any material
               modifications should be made to such unaudited financial
               statements for them to be in conformity with generally accepted
               accounting principles;

                    (B)  at the date of the latest available balance sheet read
               by such accountants, or at a subsequent specified date not more
               than three business days prior to the date of this Agreement,
               there was any change in the capital stock or any increase in
               short-term indebtedness or long-term debt of the Company and its
               consolidated subsidiaries or, at the date of the latest available
               balance sheet read by such accountants, there was any decrease in
               consolidated net current assets or net assets, as compared with
               amounts shown on the latest balance sheet included in the
               Prospectus; or

                    (C)  for the period from the closing date of the latest
               income statement included in the Prospectus to the closing date
               of the latest available income statement read by such accountants
               there were any decreases, as compared with the corresponding
               period of the previous year and with the period of corresponding
               length ended the date of the latest income statement included in
               the Prospectus, in total revenues, or increases, as compared with
               the corresponding period of the previous year and with the period
               of corresponding length ended the date of the latest income
               statement included in the Prospectus, in operating loss, or in
               the total or per share amounts of net loss,

                    except in all cases set forth in clauses (B) and (C) above
               for changes, increases or decreases which the Prospectus
               discloses have occurred or may occur or which are described in
               such letter; and

          (iv) they have compared specified dollar amounts (or percentages
          derived from such dollar amounts) and other financial information
          contained in the Registration Statements (in each case to the extent
          that such dollar amounts, percentages and other financial information
          are derived from the general accounting records of the Company and its

                                       11
   12

          subsidiaries subject to the internal controls of the Company's
          accounting system or are derived directly from such records by
          analysis or computation) with the results obtained from inquiries, a
          reading of such general accounting records and other procedures
          specified in such letter and have found such dollar amounts,
          percentages and other financial information to be in agreement with
          such results, except as otherwise specified in such letter.

     For purposes of this subsection, (i) if the Effective Time of the Initial
     Registration Statement is subsequent to the execution and delivery of this
     Agreement, "REGISTRATION STATEMENTS" shall mean the initial registration
     statement as proposed to be amended by the amendment or post-effective
     amendment to be filed shortly prior to its Effective Time, (ii) if the
     Effective Time of the Initial Registration Statement is prior to the
     execution and delivery of this Agreement but the Effective Time of the
     Additional Registration is subsequent to such execution and delivery,
     "REGISTRATION STATEMENTS" shall mean the Initial Registration Statement and
     the additional registration statement as proposed to be filed or as
     proposed to be amended by the post-effective amendment to be filed shortly
     prior to its Effective Time, and (iii) "PROSPECTUS" shall mean the
     prospectus included in the Registration Statements.

          (b)  If the Effective Time of the Initial Registration Statement is
     not prior to the execution and delivery of this Agreement, such Effective
     Time shall have occurred not later than 10:00 P.M., New York time, on the
     date of this Agreement or such later date as shall have been consented to
     by CSFBC. If the Effective Time of the Additional Registration Statement
     (if any) is not prior to the execution and delivery of this Agreement, such
     Effective Time shall have occurred not later than 10:00 P.M., New York
     time, on the date of this Agreement or, if earlier, the time the Prospectus
     is printed and distributed to any Underwriter, or shall have occurred at
     such later date as shall have been consented to by CSFBC. If the Effective
     Time of the Initial Registration Statement is prior to the execution and
     delivery of this Agreement, the Prospectus shall have been filed with the
     Commission in accordance with the Rules and Regulations and Section 5(a) of
     this Agreement. Prior to such Closing Date, no stop order suspending the
     effectiveness of a Registration Statement shall have been issued and no
     proceedings for that purpose shall have been instituted or, to the
     knowledge of the Company or the Representatives, shall be contemplated by
     the Commission.

          (c)  Subsequent to the execution and delivery of this Agreement, there
     shall not have occurred (i) any change, or any development or event
     involving a prospective change, in the condition (financial or other),
     business, properties or results of operations of the Company and its
     subsidiaries taken as one enterprise which, in the judgment of a majority
     in interest of the Underwriters including the Representatives, is material
     and adverse and makes it impractical or inadvisable to proceed with
     completion of the public offering or the sale of and payment for the
     Offered Securities; (ii) any downgrading in the rating of any debt
     securities of the Company by any "nationally recognized statistical rating
     organization" (as defined for purposes of Rule 436(g) under the Act), or
     any public announcement that any such organization has under surveillance
     or review its rating of any debt securities of the Company (other than an
     announcement with positive implications of a possible upgrading, and no
     implication of a possible downgrading, of such rating); (iii) any material
     suspension or material limitation of trading in securities generally on the
     New York Stock Exchange, or any setting of minimum prices for trading on
     such exchange, or any suspension of trading of any securities of the
     Company on any exchange or in the over-the-counter market; (iv) any banking
     moratorium declared by U.S. Federal or New York authorities; or (v) any
     outbreak or escalation of major hostilities in which the United States is
     involved, any declaration of war by Congress or any other substantial
     national or international calamity or emergency if, in the judgment of a
     majority in interest of the Underwriters including the Representatives, the
     effect of any such outbreak, escalation, declaration, calamity or emergency

                                       12
   13

     makes it impractical or inadvisable to proceed with completion of the
     public offering or the sale of and payment for the Offered Securities.

          (d)  The Representatives shall have received an opinion, dated such
     Closing Date, of the general counsel of the Company, to the effect that:

               (i)  The Company and each of its subsidiaries has been duly
          incorporated and is an existing corporation in good standing under the
          laws of the State of Delaware, with corporate power and authority to
          own its properties and conduct its business as described in the
          Prospectus; and the Company and each of its subsidiaries is duly
          qualified to do business as a foreign corporation in good standing in
          _______________;

               (ii) All of the issued and outstanding shares of capital stock of
          each of the subsidiaries of the Company have been duly authorized and
          validly issued, are fully paid and nonassessable and, to such
          counsel's knowledge, are owned beneficially by the Company free and
          clear of any liens, encumbrances and defects; and

               (iii) To the best of such counsel's knowledge, the stockholders
          of the Company do not have any contractual or other preemptive rights
          with respect to the Securities.

          (e)  The Representatives shall have received an opinion, dated such
     Closing Date, of Hale and Dorr LLP, counsel for the Company, to the effect
     that:

               (i)  The Company has the authorized, issued and outstanding
          capitalization as set forth in the Prospectus;

               (ii) The Offered Securities delivered on such Closing Date and
          all other outstanding shares of the Common Stock of the Company have
          been duly authorized and validly issued, are, or in the case of the
          Offered Securities when paid for in accordance with the terms of this
          Agreement will be, fully paid and nonassessable and conform to the
          description thereof contained in the Prospectus; and the stockholders
          of the Company have no preemptive rights with respect to the
          Securities pursuant to the Delaware General Corporation Law or the
          Certificate of Incorporation or Bylaws of the Company;

               (iii) Except as described in the Prospectus, there are no
          contracts, agreements or understandings known to such counsel between
          the Company and any person granting such person the right to require
          the Company to file a registration statement under the Act with
          respect to any securities of the Company owned or to be owned by such
          person or to require the Company to include such securities in the
          securities registered pursuant to the Registration Statement or in any
          securities being registered pursuant to any other registration
          statement filed by the Company under the Act;

               (iv) The Company is not and, after giving effect to the offering
          and sale of the Offered Securities and the application of the proceeds
          thereof as described in the Prospectus, will not be an "investment
          company" as defined in the Investment Company Act of 1940;

               (v)  No consent, approval, authorization or order of, or filing
          with, any governmental agency or body or any court is required to be
          obtained or made by the Company for the consummation of the
          transactions contemplated by this Agreement in

                                       13
   14

          connection with the issuance or sale of the Offered Securities by the
          Company, except such as have been obtained and made under the Act and
          such as may be required under state securities laws;

               (vi) The execution, delivery and performance by the Company of
          this Agreement and the issuance and sale of the Offered Securities
          will not result in a breach or violation of any of the terms and
          provisions of, or constitute a default under, any statute, any rule,
          regulation or, to the knowledge of such counsel, any order of any
          governmental agency or body or any court having jurisdiction over the
          Company or any subsidiary of the Company or any of their properties
          and naming the Company or any subsidiary, or any agreement or
          instrument filed as an exhibit to the Registration Statement to which
          the Company or any such subsidiary is a party or by which the Company
          or any such subsidiary is bound or to which any of the properties of
          the Company or any such subsidiary is subject, or the Certificate of
          Incorporation or Bylaws of the Company or any such subsidiary, and the
          Company has full power and authority to authorize, issue and sell the
          Offered Securities as contemplated by this Agreement;

               (vii) The Initial Registration Statement was declared effective
          under the Act as of the date and time specified in such opinion, the
          Additional Registration Statement (if any) was filed and became
          effective under the Act as of the date and time (if determinable)
          specified in such opinion, the Prospectus either was filed with the
          Commission pursuant to the subparagraph of Rule 424(b) specified in
          such opinion on the date specified therein or was included in the
          Initial Registration Statement or the Additional Registration
          Statement (as the case may be), and, to the best of the knowledge of
          such counsel, no stop order suspending the effectiveness of a
          Registration Statement or any part thereof has been issued and no
          proceedings for that purpose have been instituted or are pending or,
          to such counsel's knowledge, threatened under the Act, and each
          Registration Statement and the Prospectus, and each amendment or
          supplement thereto, as of their respective effective or issue dates,
          complied as to form in all material respects with the requirements of
          the Act and the Rules and Regulations; and such counsel do not know of
          any legal or governmental proceedings to which the Company or any of
          its subsidiaries is a party or by which the Company or any of its
          subsidiaries or any of their respective properties are bound that are
          required to be described in a Registration Statement or the Prospectus
          which are not described as required or of any contracts or documents
          of a character required to be described in a Registration Statement or
          the Prospectus or to be filed as exhibits to a Registration Statement
          which are not described and filed as required; it being understood
          that such counsel need express no opinion as to the financial
          statements or other financial data derived therefrom contained in the
          Registration Statements or the Prospectus;

               (viii) The descriptions set forth (A) in the Prospectus under the
          headings "Underwriting" (as such relates to a description of the
          Underwriting Agreement) and "Prospectus Summary," "Management's
          Discussion and Analysis of Financial Condition and Results of
          Operations--Overview," "Government Regulation," "Management--Director
          Compensation," "Management--Employment Agreements," "Management--Stock
          Plans," "Relationships with Siemens and Related Party Transactions,"
          "Description of Capital Stock," "Shares Eligible for Future Sale" and
          (B) in the Registration Statement in Items 14 and 15, in each case,
          insofar as such statements constitute a summary of statutes, legal and
          governmental proceedings and contracts and other documents are
          accurate and fairly present the information required to be shown;

                                       14
   15

               (ix) This Agreement has been duly authorized, executed and
          delivered by the Company; and

               (x)  The Merger Agreement has been duly authorized by all
          necessary board of directors action on the part of the Company and has
          been duly executed and delivered by the Company. The execution and
          delivery of the Merger Agreement and the consummation of the merger
          contemplated thereby will not result in a breach or violation of any
          of the terms and provisions of, or constitute a default under, any
          statute, any rule, regulation or, to the knowledge of such counsel,
          any order of any governmental agency or body or any court having
          jurisdiction over the Company or any subsidiary of the Company or any
          of their properties and naming the Company or any subsidiary, or any
          agreement or instrument filed as an exhibit to the Registration
          Statement to which the Company or any such subsidiary is a party or by
          which the Company or any such subsidiary is bound or to which any of
          the properties of the Company or any such subsidiary is subject, or
          the Certificate of Incorporation or Bylaws of the Company or any such
          subsidiary, and the Company has full power and authority to perform
          its obligations as contemplated by the Merger Agreement.

In addition, such counsel shall state that, in connection with the preparation
of the Registration Statement and the Prospectus, they have participated in
conferences with officers and representatives of the Company, counsel for the
Underwriters and the independent accountants of the Company, at which
conferences they made inquiries of such persons and others and discussed the
contents of the Registration Statement and the Prospectus; no facts have come to
their attention which have caused them to believe that the Registration
Statement, as of the Effective Date (but after giving effect to changes
incorporated pursuant to Rule 430A under the Act), contained any untrue
statement of a material fact or omitted to state any material fact required to
be stated therein or necessary in order to make the statements therein not
misleading, that the Prospectus, as of the date it was filed with the Commission
pursuant to Rule 424(b)(4) under the Act, contained any untrue statement of a
material fact or omitted to state any material fact necessary in order to make
the statements therein, in light of the circumstances under which they were
made, not misleading (except that they express no such view with respect to the
financial statements, including the notes and schedules thereto, or any other
financial information derived therefrom), or that the Registration Statement or
the Prospectus, as of the date of such opinion, contained any untrue statement
of a material fact or omitted to state any material fact necessary in order to
make the statements therein, in light of the circumstances under which they were
made, not misleading (except that they express no such view with respect to the
financial statements, including the notes and schedules thereto, or any other
financial information derived therefrom).

          (f)  The Representatives shall have received from Gunderson Dettmer
     Stough Villeneuve Franklin & Hachigian, LLP, counsel for the Underwriters,
     such opinion or opinions, dated such Closing Date, with respect to the
     incorporation of the Company, the validity of the Offered Securities
     delivered on such Closing Date, the Registration Statements, the Prospectus
     and other related matters as the Representatives may require, and the
     Company shall have furnished to such counsel such documents as they request
     for the purpose of enabling them to pass upon such matters. In rendering
     such opinion. Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP
     may rely as to the incorporation of the Company and all other matters
     governed by Delaware law upon the opinions of the general counsel of the
     Company and of Hale and Dorr LLP referred to above.

          (g)  The Representatives shall have received a certificate, dated such
     Closing Date, of the President or any Vice President and a principal
     financial or accounting officer of the Company in which such officers, to
     the best of their knowledge after reasonable investigation, shall state on
     behalf of the Company that: the representations and warranties of the
     Company in

                                       15
   16

     this Agreement are true and correct; the Company has complied with all
     agreements and satisfied all conditions on its part to be performed or
     satisfied hereunder at or prior to such Closing Date; no stop order
     suspending the effectiveness of any Registration Statement has been issued
     and, to their knowledge, no proceedings for that purpose have been
     instituted or are threatened by the Commission; the Additional Registration
     Statement (if any) satisfying the requirements of subparagraphs (1) and (3)
     of Rule 462(b) was filed pursuant to Rule 462(b), including payment of the
     applicable filing fee in accordance with Rule 111(a) or (b) under the Act,
     prior to the time the Prospectus was printed and distributed to any
     Underwriter; and, subsequent to the date of the most recent financial
     statements in the Prospectus, there has been no material adverse change,
     nor any development or event involving a prospective material adverse
     change, in the condition (financial or other), business, properties or
     results of operations of the Company and its subsidiaries taken as a whole
     except as set forth in or contemplated by the Prospectus or as described in
     such certificate.

          (h)  The Representatives shall have received a letter, dated such
     Closing Date, of KPMG LLP which meets the requirements of subsection (a) of
     this Section, except that the specified date referred to in such subsection
     will be a date not more than three days prior to such Closing Date for the
     purposes of this subsection.

          (i)  On or prior to the date of this Agreement, the Representatives
     shall have received lockup letters from each of the executive officers and
     directors of the Company.

The Company will furnish the Representatives with such conformed copies of such
opinions, certificates, letters and documents as the Representatives reasonably
request. CSFBC may in its sole discretion waive on behalf of the Underwriters
compliance with any conditions to the obligations of the Underwriters hereunder,
whether in respect of an Optional Closing Date or otherwise.

     7.   Indemnification and Contribution. (a) The Company will indemnify and
hold harmless each Underwriter, its partners, directors and officers and each
person, if any, who controls such Underwriter within the meaning of Section 15
of the Act, against any losses, claims, damages or liabilities, joint or
several, to which such Underwriter may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration Statement,
the Prospectus, or any amendment or supplement thereto, or any related
preliminary prospectus, or arise out of or are based upon the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
each Underwriter for any legal or other expenses reasonably incurred by such
Underwriter in connection with investigating or defending any such loss, claim,
damage, liability or action as such expenses are incurred; provided, however,
that the Company will not be liable in any such case to the extent that any such
loss, claim, damage or liability arises out of or is based upon an untrue
statement or alleged untrue statement in or omission or alleged omission from
any of such documents in reliance upon and in conformity with written
information furnished to the Company by any Underwriter through the
Representatives specifically for use therein, it being understood and agreed
that the only such information furnished by any Underwriter consists of the
information described as such in subsection (b) below; and provided, further,
that with respect to any untrue statement or alleged untrue statement in or
omission or alleged omission from any preliminary prospectus the indemnity
agreement contained in this subsection (a) shall not inure to the benefit of any
Underwriter from whom the person asserting any such losses, claims, damages or
liabilities purchased the Offered Securities concerned, to the extent that a
prospectus relating to such Offered Securities was required to be delivered by
such Underwriter under the Act in connection with such purchase and any such
loss, claim, damage or liability of such Underwriter results from the fact that
there was not sent or given to

                                       16
   17

such person, at or prior to the written confirmation of the sale of such Offered
Securities to such person, a copy of the Prospectus if the Company had
previously furnished copies thereof to such Underwriter.

     The Company agrees to indemnify and hold harmless the Designated
Underwriter and each person, if any, who controls the Designated Underwriter
within the meaning of either Section 15 of the Securities Act or Section 20 of
the Exchange Act (the "DESIGNATED ENTITIES"), from and against any and all
losses, claims, damages and liabilities (including, without limitation, any
legal or other expenses reasonably incurred in connection with defending or
investigating any such action or claim) (i) caused by any untrue statement or
alleged untrue statement of a material fact contained in any material prepared
by or with the consent of the Company for distribution to Participants in
connection with the Directed Share Program or caused by any omission or alleged
omission to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading; (ii) caused by the
failure of any Participant to pay for and accept delivery of Directed Shares
that the Participant agreed to purchase; or (iii) related to, arising out of, or
in connection with the Directed Share Program, other than losses, claims,
damages or liabilities (or expenses relating thereto) that are finally
judicially determined to have resulted from the bad faith or gross negligence of
the Designated Entities.

          (b)  Each Underwriter will severally and not jointly indemnify and
     hold harmless the Company, its directors and officers and each person, if
     any who controls the Company within the meaning of Section 15 of the Act,
     against any losses, claims, damages or liabilities to which the Company may
     become subject, under the Act or otherwise, insofar as such losses, claims,
     damages or liabilities (or actions in respect thereof) arise out of or are
     based upon any untrue statement or alleged untrue statement of any material
     fact contained in any Registration Statement, the Prospectus, or any
     amendment or supplement thereto, or any related preliminary prospectus, or
     arise out of or are based upon the omission or the alleged omission to
     state therein a material fact required to be stated therein or necessary to
     make the statements therein not misleading, in each case to the extent, but
     only to the extent, that such untrue statement or alleged untrue statement
     or omission or alleged omission was made in reliance upon and in conformity
     with written information furnished to the Company by such Underwriter
     through the Representatives specifically for use therein, and will
     reimburse any legal or other expenses reasonably incurred by the Company in
     connection with investigating or defending any such loss, claim, damage,
     liability or action as such expenses are incurred, it being understood and
     agreed that the only such information furnished by any Underwriter consists
     of (i) the following information in the Prospectus furnished on behalf of
     each Underwriter: the concession and reallowance figures appearing in the
     fourth paragraph under the caption "Underwriting" and the information
     contained in the sixth and fourteenth paragraphs under the caption
     "Underwriting".

          (c)  Promptly after receipt by an indemnified party under this Section
     of notice of the commencement of any action, such indemnified party will,
     if a claim in respect thereof is to be made against the indemnifying party
     under subsection (a) or (b) above, notify the indemnifying party of the
     commencement thereof; but the omission so to notify the indemnifying party
     will not relieve it from any liability which it may have to any indemnified
     party otherwise than under subsection (a) or (b) above. In case any such
     action is brought against any indemnified party and it notifies the
     indemnifying party of the commencement thereof, the indemnifying party will
     be entitled to participate therein and, to the extent that it may wish,
     jointly with any other indemnifying party similarly notified, to assume the
     defense thereof, with counsel satisfactory to such indemnified party (who
     shall not, except with the consent of the indemnified party, be counsel to
     the indemnifying party), and after notice from the indemnifying party to
     such indemnified party of its election so to assume the defense thereof,
     the indemnifying party will not be liable to such indemnified party under
     this Section, for any legal or other expenses subsequently incurred by such
     indemnified party in connection with the defense thereof other than
     reasonable costs of investigation. Notwithstanding anything contained
     herein to the contrary, if

                                       17
   18

     indemnity may be sought pursuant to the last paragraph in Section 7(a)
     hereof in respect of such action or proceeding, then in addition to such
     separate firm for the indemnified parties, the indemnifying party shall be
     liable for the reasonable fees and expenses of not more than one separate
     firm (in addition to any local counsel) for the Designated Underwriter for
     the defense of any losses, claims, damages and liabilities arising out of
     the Directed Share Program, and all persons, if any, who control the
     Designated Underwriter within the meaning of either Section 15 of the Act
     of Section 20 of the Exchange Act. No indemnifying party shall, without the
     prior written consent of the indemnified party, effect any settlement of
     any pending or threatened action in respect of which any indemnified party
     is or could have been a party and indemnity could have been sought
     hereunder by such indemnified party unless such settlement (i) includes an
     unconditional release of such indemnified party from all liability on any
     claims that are the subject matter of such action and (ii) does not include
     a statement as to, or an admission of, fault, culpability or a failure to
     act by or on behalf of an indemnified party.

          (d)  If the indemnification provided for in this Section is
     unavailable or insufficient to hold harmless an indemnified party under
     subsection (a) or (b) above, then each indemnifying party shall contribute
     to the amount paid or payable by such indemnified party as a result of the
     losses, claims, damages or liabilities referred to in subsection (a) or (b)
     above (i) in such proportion as is appropriate to reflect the relative
     benefits received by the Company on the one hand and the Underwriters on
     the other from the offering of the Securities or (ii) if the allocation
     provided by clause (i) above is not permitted by applicable law, in such
     proportion as is appropriate to reflect not only the relative benefits
     referred to in clause (i) above but also the relative fault of the Company
     on the one hand and the Underwriters on the other in connection with the
     statements or omissions which resulted in such losses, claims, damages or
     liabilities as well as any other relevant equitable considerations. The
     relative benefits received by the Company on the one hand and the
     Underwriters on the other shall be deemed to be in the same proportion as
     the total net proceeds from the offering (before deducting expenses)
     received by the Company bear to the total underwriting discounts and
     commissions received by the Underwriters. The relative fault shall be
     determined by reference to, among other things, whether the untrue or
     alleged untrue statement of a material fact or the omission or alleged
     omission to state a material fact relates to information supplied by the
     Company or the Underwriters and the parties' relative intent, knowledge,
     access to information and opportunity to correct or prevent such untrue
     statement or omission. The amount paid by an indemnified party as a result
     of the losses, claims, damages or liabilities referred to in the first
     sentence of this subsection (d) shall be deemed to include any legal or
     other expenses reasonably incurred by such indemnified party in connection
     with investigating or defending any action or claim which is the subject of
     this subsection (d). Notwithstanding the provisions of this subsection (d),
     no Underwriter shall be required to contribute any amount in excess of the
     amount by which the total price at which the Securities underwritten by it
     and distributed to the public were offered to the public exceeds the amount
     of any damages which such Underwriter has otherwise been required to pay by
     reason of such untrue or alleged untrue statement or omission or alleged
     omission. No person guilty of fraudulent misrepresentation (within the
     meaning of Section 11(f) of the Act) shall be entitled to contribution from
     any person who was not guilty of such fraudulent misrepresentation. The
     Underwriters' obligations in this subsection (d) to contribute are several
     in proportion to their respective underwriting obligations and not joint.

          (e)  The obligations of the Company under this Section shall be in
     addition to any liability which the Company may otherwise have and shall
     extend, upon the same terms and conditions, to each person, if any, who
     controls any Underwriter within the meaning of the Act; and the obligations
     of the Underwriters under this Section shall be in addition to any
     liability which the respective Underwriters may otherwise have and shall
     extend, upon the same terms and conditions, to each director of the
     Company, to each officer of the Company who has signed a

                                       18
   19

     Registration Statement and to each person, if any, who controls the Company
     within the meaning of the Act.

     8.   Default of Underwriters. If any Underwriter or Underwriters default in
their obligations to purchase Offered Securities hereunder on either the First
or any Optional Closing Date and the aggregate number of shares of Offered
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase does not exceed 10% of the total number of shares of Offered Securities
that the Underwriters are obligated to purchase on such Closing Date, CSFBC may
make arrangements satisfactory to the Company for the purchase of such Offered
Securities by other persons, including any of the Underwriters, but if no such
arrangements are made by such Closing Date, the non-defaulting Underwriters
shall be obligated severally, in proportion to their respective commitments
hereunder, to purchase the Offered Securities that such defaulting Underwriters
agreed but failed to purchase on such Closing Date. If any Underwriter or
Underwriters so default and the aggregate number of shares of Offered Securities
with respect to which such default or defaults occur exceeds 10% of the total
number of shares of Offered Securities that the Underwriters are obligated to
purchase on such Closing Date and arrangements satisfactory to CSFBC and the
Company for the purchase of such Offered Securities by other persons are not
made within 36 hours after such default, this Agreement will terminate without
liability on the part of any non-defaulting Underwriter or the Company, except
as provided in Section 9 (provided that if such default occurs with respect to
Optional Securities after the First Closing Date, this Agreement will not
terminate as to the Firm Securities or any Optional Securities purchased prior
to such termination). As used in this Agreement, the term "Underwriter" includes
any person substituted for an Underwriter under this Section. Nothing herein
will relieve a defaulting Underwriter from liability for its default.

     9.   Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements of the
Company or its officers and of the several Underwriters set forth in or made
pursuant to this Agreement will remain in full force and effect, regardless of
any investigation, or statement as to the results thereof, made by or on behalf
of any Underwriter, the Company or any of their respective representatives,
officers or directors or any controlling person, and will survive delivery of
and payment for the Offered Securities. If this Agreement is terminated pursuant
to Section 8 or if for any reason the purchase of the Offered Securities by the
Underwriters is not consummated, the Company shall remain responsible for the
expenses to be paid or reimbursed by it pursuant to Section 5 and the respective
obligations of the Company and the Underwriters pursuant to Section 7 shall
remain in effect, and if any Offered Securities have been purchased hereunder
the representations and warranties in Section 2 and all obligations under
Section 5 shall also remain in effect. If the purchase of the Offered Securities
by the Underwriters is not consummated for any reason other than solely because
of the termination of this Agreement pursuant to Section 8 or the occurrence of
any event specified in clause (iii), (iv) or (v) of Section 6(c), the Company
will reimburse the Underwriters for all out-of-pocket expenses (including fees
and disbursements of counsel) reasonably incurred by them in connection with the
offering of the Offered Securities.

     10.  Notices. All communications hereunder will be in writing and, if sent
to the Underwriters, will be mailed, delivered or telegraphed and confirmed to
the Representatives, c/o Credit Suisse First Boston Corporation, Eleven Madison
Avenue, New York, N.Y. 10010-3629, Attention: Investment Banking
Department--Transactions Advisory Group, or, if sent to the Company, will be
mailed, delivered or telegraphed and confirmed to it at Unisphere Networks,
Inc., 1 Executive Drive, Chelmsford, MA 01824, Attention: James A. Dolce, Jr.;
provided, however, that any notice to an Underwriter pursuant to Section 7 will
be mailed, delivered or telegraphed and confirmed to such Underwriter.

                                       19
   20

     11.  Successors. This Agreement will inure to the benefit of and be binding
upon the parties hereto and their respective successors and the officers and
directors and controlling persons referred to in Section 7, and no other person
will have any right or obligation hereunder.

     12.  Representation of Underwriters. The Representatives will act for the
several Underwriters in connection with this financing, and any action under
this Agreement taken by the Representatives jointly or by CSFBC will be binding
upon all the Underwriters.

     13.  Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

     14.  APPLICABLE LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO PRINCIPLES
OF CONFLICTS OF LAWS.

     The Company hereby submits to the non-exclusive jurisdiction of the Federal
and state courts in the Borough of Manhattan in the City of New York in any suit
or proceeding arising out of or relating to this Agreement or the transactions
contemplated hereby.


                                       20
   21

     If the foregoing is in accordance with the Representatives' understanding
of our agreement, kindly sign and return to the Company one of the counterparts
hereof, whereupon it will become a binding agreement between the Company and the
several Underwriters in accordance with its terms.

                              Very truly yours,

                                   UNISPHERE NETWORKS, INC.


                                        By......................................
                                        Title...................................


The foregoing Underwriting Agreement is hereby confirmed and accepted as of the
  date first above written.

     CREDIT SUISSE FIRST BOSTON CORPORATION

     J.P. MORGAN SECURITIES INC.

     UBS WARBURG LLC

         Acting on behalf of themselves and as the
            Representatives of the several Underwriters

     By  CREDIT SUISSE FIRST BOSTON CORPORATION


     By.......................................................
     Title....................................................


                                       21
   22

                                   SCHEDULE A


                             UNDERWRITER                            NUMBER OF
                             -----------                         FIRM SECURITIES
                                                                 ---------------

Credit Suisse First Boston Corporation.......................
J.P. Morgan Securities Inc...................................
UBS Warburg LLC..............................................











                                                                 ---------------
                           Total.............................        8,500,000
                                                                 ===============