VOTING AGREEMENT
                                ----------------

                  THIS VOTING AGREEMENT (this "AGREEMENT") is made this 13th day
of  December,  1999,  by and among  Robert C. Penny III and Melvin J. Simon (the
"TRUSTEES"), as trustees pursuant to a Voting Trust Agreement dated February 23,
1994,  as amended  (the  "VOTING  TRUST"),  among  Messrs.  Penny and Simon,  as
trustees,  and certain  stockholders of Westell  Technologies,  Inc., a Delaware
Corporation ("PARENT"),  Robert C. Penny III, individually and as trustee of any
Holder (as defined in the Voting Trust) under the Voting Trust, Melvin J. Simon,
individually and as trustee of any Holder (as defined in the Voting Trust) under
the Voting Trust, and Teltrend Inc., a Delaware corporation (the "COMPANY").

                              W I T N E S S E T H:

                  WHEREAS,  concurrently with the execution and delivery of this
Agreement,  an Agreement  and Plan of Merger (as such  agreement  may be amended
from time to time,  the "MERGER  AGREEMENT")  is being entered into by and among
the  Company,  Parent  and  Theta  Acquisition  Corp.,  a  Delaware  corporation
("SUBSIDIARY"),  pursuant to which  Subsidiary has agreed to merge with and into
the Company,  with the Company  continuing  as the  surviving  corporation  (the
"MERGER");

                  WHEREAS,   in  connection  with  the  Merger  Agreement,   the
stockholders  of Parent must  approve the issuance of Parent Stock (as such term
and each other capitalized term used and not otherwise defined herein is defined
in the Merger  Agreement)  in  connection  with the Merger  (the  "PARENT  STOCK
ISSUANCE ") and the amendment to Parent's  Amended and Restated  Certificate  of
Incorporation  to increase the number of authorized  shares of Parent Stock (the
"PARENT CHARTER AMENDMENT");

                  WHEREAS,  the  affirmative  vote  of  stockholders  of  Parent
required  for approval of (i) the Parent  Stock  Issuance,  is a majority of the
total  votes  cast  thereon,  in  person  or  by  proxy  at a  meeting  of  such
stockholders, by holders of Parent Stock and Parent Class B Common Stock, voting
together as a single class, and (ii) the Parent Charter Amendment, is a majority
of the voting power of the outstanding shares of Parent Stock and Parent Class B
Common Stock, voting together as a single class; and

                  WHEREAS,  as a condition  to, and in  consideration  for,  the
Company's  willingness to enter into the Merger  Agreement and to consummate the
transactions   contemplated   thereby,   the  Company  has  required   that  the
Stockholders (as defined below) enter into this Agreement.

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
mutual representations,  warranties,  covenants and agreements contained herein,
the parties hereto, intending to be legally bound, hereby agree as follows:

                  1. DEFINITIONS.  For purposes of this Agreement:




                  "PARENT  SECURITIES"  shall mean the  Parent  Stock and Parent
Class B Common Stock.

                  "PERMITTED  TRANSFER" means the transfer by any Stockholder of
Parent Class B Common Stock in a  transaction  pursuant to which either (i) such
shares of Parent  Class B Common Stock (A) are  converted  into shares of Parent
Stock  pursuant to the  provisions  of the Amended and Restated  Certificate  of
Incorporation, as amended, of Parent in effect as of the date hereof and (B) are
transferred  to an  Unaffiliated  Person,  or (ii) such shares of Parent Class B
Common Stock are  transferred  to a Person who prior to such transfer  agrees in
writing to become a Stockholder hereunder and to assume, observe and perform all
agreements,  restrictions  and  limitations  contained  in this  Agreement  with
respect to such shares (and any shares into which they are converted pursuant to
such  transfer or  otherwise),  except that such Person shall not be required to
make the representations and warranties contained in Section 4 hereof.

                  "PERSON" shall mean an individual,  corporation,  partnership,
limited liability company,  joint venture,  association,  trust,  unincorporated
organization or other entity.

                  "SHARES"  shall mean (i)  18,651,622  shares of Parent Class B
Common  Stock held by the  Trustees  pursuant  to the Voting  Trust (the  "TRUST
SHARES"),  (ii) all other Parent Securities which any Stockholder owns or has or
shares  the power to vote or cause to be voted of as of the date  hereof  (which
Parent  Securities  are set forth on  SCHEDULE  I  hereto),  (iii) any shares of
Parent  Securities  distributed  prior to the  termination  of this Agreement in
respect of the shares  described in the foregoing  clauses (i) or (ii) by reason
of a stock dividend, split-up, recapitalization,  reclassification, combination,
merger, exchange of shares or otherwise, and (iv) any other shares of the Parent
Securities  of which any  Stockholder  acquires the power to vote or cause to be
voted, either directly or indirectly, prior to the Effective Time.

                  "STOCKHOLDERS" shall mean (i) the Trustees in their capacities
as trustees  of the Voting  Trust,  (ii) Robert C. Penny III, in his  individual
capacity  and as trustee of any Holder under the Voting  Trust,  (iii) Melvin J.
Simon, in his individual  capacity and as trustee of any Holder under the Voting
Trust, and (iv) any Person who becomes a Stockholder  pursuant to clause (ii) of
the definition of Permitted Transfers.

                  "UNAFFILIATED  PERSONS" shall mean all Persons who are not (i)
the  Stockholders,  (ii)  directors of Parent,  (iii)  officers (as such term is
defined in Rule 405 under the Securities  Act of 1933, as amended,  as in effect
as of the  date  hereof)  of  Parent,  or  (iv)  members  of the  family  of any
Stockholder.

                  2. AGREEMENT TO VOTE SHARES.  The  Stockholders  shall, at any
meeting of the  holders of any class or  classes of Parent  Securities,  however
such  meeting is called and  regardless  of whether such meeting is a special or
annual meeting of the stockholders of Parent,  or in connection with any written
consent of the stockholders of




Parent,  vote (or cause to be voted)  the  Shares in favor of the  Parent  Stock
Issuance,   the  Parent  Charter   Amendment  and  each  of  the  other  actions
contemplated by the Merger Agreement, if, in the case of such matter, a majority
of the votes cast with respect to such matter by holders of Parent Stock who are
Unaffiliated Persons are voted in favor of such matter. Nothing contained herein
shall be  construed as to prevent or prohibit  the  Stockholders  from voting in
favor  of  any  such  matter  if the  condition  described  in  the  immediately
preceeding sentence is not satisfied.

                  3. COVENANTS OF  THE  STOCKHOLDERS.  Each  Stockholder  hereby
agrees and covenants that:

                  (a)  Restriction  on  Transfers.  Except as may  otherwise  be
agreed by the Company and except for Permitted Transfers,  the Stockholder shall
not (i)  transfer,  or consent to any transfer of, any or all of the Shares,  or
any interest  therein if such transfer would result in the Stockholder no longer
having  the power to vote or cause to be voted the Shares or (ii) enter into any
contract,  option or other agreement or  understanding  with respect to any such
transfer of any or all of the Shares, or any interest  therein.  As used herein,
the  term  "TRANSFER",  when  used as a verb,  means to  sell,  pledge,  assign,
encumber,  dispose of or otherwise transfer  (including by merger,  testamentary
disposition,   interspousal   disposition   pursuant  to  a  domestic  relations
proceeding or otherwise or other transfer by operation of law), or, when used as
a noun, means a sale, pledge,  assignment,  encumbrance,  disposition,  or other
transfer (including a merger, testamentary disposition, interspousal disposition
pursuant to a domestic  relations  proceeding or otherwise or other  transfer by
operation of law).

                  (b) Restrictions on Proxies and Voting Arrangements. Except as
otherwise  expressly  provided herein,  the Stockholder shall not: (i) grant any
proxy,  power-of-attorney  or  other  authorization  in or with  respect  to the
Shares;  (ii)  deposit  the Shares  into a voting  trust  (other than the Voting
Trust) or enter  into a voting  agreement  or  arrangement  with  respect to the
Shares (other than the Voting Trust);  or (iii) amend,  revoke or terminate,  or
consent to the amendment,  revocation or termination of, the Voting Trust in any
manner  that  would  impair  the  ability  of any  Stockholder  to  perform  the
agreements  contained  herein or otherwise be  inconsistent  with the provisions
hereof or the transactions contemplated hereby.

                  (c) Stop  Transfer.  The  Stockholder  shall not request  that
Parent  register the transfer  (book-entry  or otherwise) of any  certificate or
uncertificated  interest representing any of the Shares, unless such transfer is
made in compliance with this Agreement.

                  (d) No Inconsistent  Arrangements.  The Stockholder  shall not
take any other action that would in any way  restrict,  limit or interfere  with
the performance of the Stockholder's  obligations  hereunder or the transactions
contemplated hereby or by the Merger Agreement.





                  4. REPRESENTATIONS  AND  WARRANTIES   OF  STOCKHOLDERS.   Each
Stockholder hereby represents and warrants to the Company as follows:

                  (a)  Ownership  of  Securities  .  On  the  date  hereof,  the
Stockholder owns, directly or indirectly,  or has the power to direct the voting
of (either  individually  or together with another  Stockholder),  (i) the Trust
Shares and (ii) the Parent Securities set forth next to the  Stockholder's  name
on Schedule I hereto (the "OTHER SHARES").  The Trust Shares are owned of record
by the Trustees,  as trustees  under the Voting Trust,  and the Other Shares are
owned of record by the  Stockholders  (as set forth on Schedule  I). On the date
hereof, the Trust Shares and Other Shares constitute all of the shares of voting
capital stock of Parent owned of record or otherwise by such  Stockholder  or as
to which  such  Stockholder  has or shares the power to direct the voting of the
shares.  Each Stockholder has (or shares with another  Stockholder)  sole voting
power and sole power to issue instructions with respect to the matters set forth
in Section 2 hereof, sole power of disposition,  sole power of conversion,  sole
power (if any) to demand  appraisal rights and sole power to agree to all of the
matters set forth in this  Agreement,  in each case with  respect to all of such
Stockholder's Shares with no limitations, qualifications or restrictions on such
rights, subject to applicable securities laws and the terms of this Agreement.

                  (b) Power;  Binding  Agreement.  The Stockholder has the power
and  authority  to enter into and perform all of the  Stockholder's  obligations
under this Agreement.  Any proxies heretofore given in respect to the Shares are
not  irrevocable,  and any such  proxies  are  hereby  revoked.  The  execution,
delivery and performance of this Agreement by the  Stockholder  will not violate
any other  agreement  to which the  Stockholder  is a party  including,  without
limitation,  the  Voting  Trust.  There are no other  voting  agreements,  proxy
arrangements, pledge agreements, shareholders agreements, voting trusts or trust
agreements in respect of any of the Trust Shares or Other Shares. This Agreement
has been  duly  and  validly  executed  and  delivered  by the  Stockholder  and
constitutes  a valid  and  binding  agreement  of the  Stockholder,  enforceable
against  the   Stockholder  in  accordance   with  its  terms,   except  as  the
enforceability thereof may be limited by (a) applicable bankruptcy,  insolvency,
moratorium, reorganization or similar laws in effect that affect the enforcement
of creditors  rights  generally  or (b) general  principles  of equity,  whether
considered  in a proceeding at law or in equity.  There is no Person,  including
without  limitation a  beneficiary  or holder of a voting trust  certificate  or
other interest of any trust of which the Stockholder is a trustee, whose consent
is required for the execution and delivery of this  Agreement or the  compliance
by the Stockholder with the terms hereof.

                  (c)  No   Conflicts.   No   filing   with,   and  no   permit,
authorization,  consent or approval of, any  governmental  entity or  regulatory
authority is required for the execution of this Agreement by the Stockholder and
the  consummation by the Stockholder of the  transactions  contemplated  hereby.
None of the execution  and delivery of this  Agreement by the  Stockholder,  the
consummation  by the  Stockholder  of the  transactions  contemplated  hereby or
compliance  by the  Stockholder  with any of the  provisions  hereof  shall  (A)
conflict  with,  or  result  in any  breach  of,  any  organizational  documents






applicable to the  Stockholder  (including  the Voting  Trust),  (B) 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 third  party right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions or provisions of any note, loan agreement, bond, mortgage, indenture,
license, contract, commitment,  arrangement,  understanding,  agreement or other
instrument or obligation of any kind to which the  Stockholder  is a party or by
which the  Stockholder or any of the  Stockholder's  properties or assets may be
bound, or (C) violate any order,  writ,  injunction,  decree,  judgment,  order,
statute,  arbitration award, rule or regulation applicable to the Stockholder or
any of the Stockholder's properties or assets.

                  (d) No Liens.  Except as established  hereby, the Trust Shares
and Other Shares are now and, at all times during the term hereof,  will be held
by the  Stockholder,  or by a  nominee  or  custodian  for  the  benefit  of the
Stockholder,  free and clear of all liens, claims, security interests,  proxies,
voting  trusts  or  agreements,  understandings  or  arrangements  or any  other
encumbrances whatsoever.

                  5. TERMINATION.  Except  for Section 6(c) hereof  (which shall
survive any  termination of this  Agreement),  this Agreement and the covenants,
representations  and  warranties  and  agreements  contained  herein or  granted
pursuant hereto shall terminate upon the earlier to occur of (i) the termination
of the Merger  Agreement  in  accordance  with  Article IX thereof  and (ii) the
consummation of the transactions  contemplated by the Merger Agreement. Upon any
termination of this Agreement, this Agreement shall thereupon become void and of
no further force and effect,  and there shall be no liability in respect of this
Agreement or of any  transactions  contemplated  hereby on the part of any party
hereto; provided,  however, that nothing herein shall relieve any party from any
liability for such party's willful breach of this Agreement.

                  6. MISCELLANEOUS.

                  (a) Specific  Performance.  Each party hereto  recognizes  and
agrees that if for any reason any of the  provisions  of this  Agreement are not
performed by the other parties in accordance  with their  specific  terms or are
otherwise breached,  immediate and irreparable harm or injury would be caused to
the  non-breaching  parties  for which  money  damages  would not be an adequate
remedy. Accordingly,  the parties agree that, in addition to any other available
remedies,   the  non-breaching  parties  shall  be  entitled  to  an  injunction
restraining  any  violation or  threatened  violation of the  provisions of this
Agreement without the necessity of the  non-breaching  parties posting a bond or
other form of security. In the event that any action should be brought in equity
to enforce  the  provisions  of this  Agreement,  the  breaching  party will not
allege,  and the  breaching  party hereby  waives the defense,  that there is an
adequate remedy at law.

                  (b)  Severability.  Any term or  provision  of this  Agreement
which  is  invalid  or  unenforceable  in any  jurisdiction  shall,  as to  that
jurisdiction,   be   ineffective   to  the   extent   of  such   invalidity   or
unenforceability  without rendering invalid or unenforceable the remaining terms
and provisions of this Agreement or affecting the





validity or  enforceability  of any of the terms or provisions of this Agreement
in any other jurisdiction.  Without limiting the foregoing,  with respect to any
provision  of  this  Agreement,  if it is  determined  by a court  of  competent
jurisdiction  to be  excessive  as to  duration  or  scope,  it is the  parties'
intention  that such  provision  nevertheless  be enforced to the fullest extent
which it may be enforced.

                  (c) Governing  Law. This  Agreement  shall be governed by, and
construed in accordance  with, the laws of the State of Delaware,  regardless of
the laws that might otherwise govern under applicable principles of conflicts of
laws thereof. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES ITS RIGHT TO A TRIAL
BY JURY IN ANY ACTION,  PROCEEDING OR COUNTERCLAIM ARISING OUT OF OR RELATING TO
THIS  AGREEMENT OR THE ACTIONS OF PARENT,  THE  COMPANY,  OR  SUBSIDIARY  IN THE
NEGOTIATION, ADMINISTRATION, PERFORMANCE AND ENFORCEMENT HEREOF.

                  (d) Entire  Agreement.  This Agreement  constitutes the entire
agreement among the parties hereto with respect to the subject matter hereof and
supersedes all other prior agreements and understandings, both written and oral,
among the parties or any of them with respect to the subject matter hereof.

                  (e)  Descriptive  Headings;  Interpretation.  The  descriptive
headings  herein are inserted  for  convenience  of  reference  only and are not
intended  to be part of or to  affect  the  meaning  or  interpretation  of this
Agreement.

                  (f) Assignment;  Binding Agreement. Neither this Agreement nor
any of the rights,  interests or obligations  hereunder shall be assigned by any
of the parties  hereto  without the prior  written  consent of the other parties
hereto;  provided,  however,  that the Company shall be permitted to assign,  in
whole or in part, this Agreement or any of the rights,  interests or obligations
hereunder to any of its  subsidiaries  or Affiliates.  This  Agreement  shall be
binding upon and inure to the benefit of and be  enforceable  by and against the
parties hereto and their respective heirs, legal representatives, successors and
permitted assigns. Nothing in this Agreement, express or implied, is intended to
confer on any other Person other than the parties hereto,  and their  respective
heirs,  legal  representatives,  successors and permitted  assigns,  any rights,
remedies, obligations or liabilities under or by reason of this Agreement.

                  (g) Amendment, Modification and Waiver. This Agreement may not
be amended, modified or waived except by an instrument or instruments in writing
signed and delivered on behalf of the party hereto against whom such  amendment,
modification or waiver is sought to be entered.

                  (h)  Counterparts.  This  Agreement  may be executed in two or
more counterparts,  each of which shall be deemed to be an original,  but all of
which shall constitute one and the same agreement.




                  IN WITNESS WHEREOF, the parties hereto have caused this Voting
Agreement executed as of the day and year first above written.


                                /s/ Robert C. Penny III
                                Robert C. Penny III, as Trustee pursuant to
                                that certain Voting Trust Agreement dated
                                February 23, 1994, as amended among
                                Robert C. Penny III and Melvin J. Simon
                                as Trustees, and certain stockholders of Parent


                                /s/ Melvin J. Simon
                                Melvin J. Simon, as Trustee pursuant to that
                                certain Voting Trust Agreement dated February
                                23, 1994, as amended among Robert C. Penny,
                                 III  and   Melvin   J.   Simon   as
                                 Trustees,  and certain stockholders
                                 of Parent


                                TELTREND INC.


                                By: /s/ Douglas P. Hoffmeyer
                                Name: Dougplas P. Hoffmeyer
                                Title: Sr. Vice President, Finance


                                /s/ Robert C. Penny III
                                Robert C. Penny III, in the capacities specified
                                herein


                                /s/ Melvin J. Simon
                                Melvin J. Simon, in the capacities specified
                                herein






                                   SCHEDULE I
                                  OTHER SHARES


Name                             Shares
- ----                             ------

Robert C. Penny III              0 Shares

Melvin J. Simon                  256,286  Shares of Parent Class B Common
                                 Stock held in trust for the benefit of
                                 Makayla G. Penny

                                 2,000 Shares of Parent Stock held in trust for
                                 the benefit of Makayla G. Penny