RIGHTS OF THE HOLDERS TO RECEIVE PAYMENTS HEREUNDER ARE SUBJECT TO A
     SUBORDINATION AGREEMENT DATED AS OF APRIL 14, 1999 (THE "SUBORDINATION
     AGREEMENT") BY AND AMONG THE HOLDERS LISTED ON SCHEDULE A ATTACHED HERETO
     AND LASALLE NATIONAL BANK ("SENIOR LENDER"). REFERENCE IS MADE TO SUCH
     AGREEMENT FOR A FULL STATEMENT OF THE TERMS AND CONDITIONS OF SUCH
     SUBORDINATION.

                                SUBORDINATE NOTE
                                   FIXED RATE


     ------------------                                     Aggregate Principal
     Chicago, Illinois                                          Amount:  $     
                                             (See Schedule A as to each Holder)



          FOR VALUE RECEIVED, Westell Technologies, Inc., a Delaware corporation
     (the "DEBTOR"), hereby promises to pay to the order of [
                            ] or registered assigns or transferees hereof (each
     a "Holder" and, collectively, the "Holders") the principal sum of         
                                     Dollars  ($             ),  together  with
     interest, in the manner provided herein. All principal and interest amounts
     due under this Note are referred to herein as the "Obligations" and are
     subject to the provisions of this Note.

          1. Repayment of Principal. Debtor shall pay the entire principal
     balance hereof and all accrued and unpaid interest thereon on or before
     [date which is 365 days following the date of issuance of this Note].

          2. Interest on Unpaid Principal Balance. Interest shall accrue on the
     unpaid principal balance hereof at the rate of 12% per annum (the "Interest
     Rate") and all interest provided herein shall be computed on the basis of a
     365-day year. Accrued interest shall be paid on each June 30 and December
     30 until the entire amount due under this Note is paid (each a "Payment
     Date") (unless such day is not a business day, in which event on the next
     succeeding business day) commencing with the first Payment Date following
     the date of issuance of this Note. In the event an interest payment is
     prohibited under the terms of the Subordination Agreement, the accrued
     interest shall be capitalized and added to the principal balance hereof.

          3. Allocation of Payments. The Debtor will pay to Holder, either by
     certified check or by wire transfer, in immediately available funds, to
     such account as Holder may specify in writing, all amounts payable to
     Holder in respect of the principal of, or interest on this Note, without
     any presentation of this Note. Each such payment, when paid, shall be
     applied first to the payment of interest accrued and unpaid under this Note
     and second to the payment or prepayment of the principal hereof. All
     payments hereunder shall be made to Holder at the addresses for each set
     forth on Schedule A attached hereto or as otherwise directed in writing by
     such Holder.

          4. Events of Default. Upon the happening of any one or more of the
     following events (each, an "Event of Default"):

                    (1) If Debtor shall fail to pay any amount of principal or
               interest when due and payable under this Note within five days
               after any Holder gives Debtor notice of such non-payment (whether
               on the due date or by acceleration or otherwise), except that
               Debtor's failure to pay such principal or interest shall not be
               an Event of Default hereunder to the extent that the Holders are
               not entitled to receive such payment under the Subordination
               Agreement; provided that Debtor makes such payment as soon as the
               Holders are permitted to receive such payment





               under such Subordination Agreement; 

                    (2) An Event of Failure as defined in the Company's 6%
               Subordinated Convertible Debentures issued April 14, 1999 (the
               "Debentures"), shall have occurred or, if no Debentures are then
               outstanding, any event shall have occurred which would have been
               an Event of Failure under the Debentures if any Debentures were
               then outstanding; or

                    (3) A Major Transaction (as defined in the Debentures) shall
               have occurred, whether or not any Debentures are then
               outstanding;

     then and at any time thereafter during the continuance of any such Event of
     Default: (i) Holder may, by notice to Debtor, declare the entire aggregate
     principal of and accrued interest on this Note to be immediately due and
     payable, whereupon this Note and all accrued interest will thereupon
     immediately become due and payable without presentment, notice, demand,
     protest, or further notice of any kind whatsoever, all of which are hereby
     expressly waived, except that upon the occurrence of an Event of Default
     specified in (c) above, the entire principal of and accrued interest on
     this Note shall automatically and immediately become due and payable
     without such notice and without presentment, notice, demand, or protest of
     any kind whatsoever, all of which are hereby expressly waived; and (ii)
     Holder may exercise any or all other remedies available under law or under
     any other agreements or instruments securing or related to this Note.

          5. Exchange. Holder may, by written request (a "Solvency Confirmation
     Request") deliver to Debtor from time to time, request confirmation from
     Debtor that Debtor continues to meet the Solvency Conditions (as defined in
     the Debenture). Within five (5) business days of receipt of a Solvency
     Confirmation Request (the "Confirmation Date") either (a) if Debtor
     continues to meet the Solvency Conditions, this Note shall remain
     outstanding and Debtor shall deliver to the Holder a certificate of the
     chief financial officer of Debtor certifying that Debtor continues to meet
     the Solvency Conditions or (b) if Debtor no longer continues to meet the
     Solvency Conditions, this Note shall, at the option of Holder, be exchanged
     for, and Debtor shall deliver to Holder, a debenture identical to the
     Debenture (a "New Debenture") except that the New Debenture (i) shall
     provide for a Conversion Price at all times that is equal to the lower of
     the Variable Conversion Price (assuming for this purpose that such Variable
     Conversion Price shall be deemed to be the lower of the Variable Conversion
     Price under the Debenture and the average of the closing bid prices of the
     Class A Common Stock for the five (5) trading days immediately preceding
     the Solvency Confirmation Request) and the Market Conversion Price, (ii)
     shall be dated the Confirmation Date, (iii) shall have a principal amount
     equal to the principal amount and amount of accrued and unpaid interest on
     the Note as of the Confirmation Date and (iv) shall not allow for the
     issuance of Cap Debentures (all such capitalized equal terms to have the
     meanings ascribed to them in the Debenture). Holder shall also have the
     right to exchange this Note for a new Debenture at any time following the
     occurrence of an Event of Default as described in Section 4(a) hereof.

          6. General. Interests in this Note are transferrable only by written
     notice to Debtor, and this Note shall be duly endorsed as to such interest
     or accompanied by a written instrument or transfer executed by the
     registered Holder. Payment of principal or interest on this Note shall be
     made only to or upon order of the registered Holders. Upon transfer of any
     interest in this Note as provided above, Debtor shall issue a new Schedule
     A to this Note, registered in the name of the then current Holders and
     transferee (subject to compliance with any applicable federal or state
     securities laws, rules or regulations).

          7. Debtor hereby:





                    (1) waives diligence, presentment, demand for payment,
               notice of dishonor, notice of non-payment, protest, notice of
               protest, and any and all other demand in connection with the
               delivery, acceptance, performance, default or enforcement of this
               Note;

                    (2) waives the benefit of any statute of limitations to the
               maximum extent permitted by law with respect to any action to
               enforce or otherwise related to this Note;

                    (3) agrees that Holder shall have the right, without notice,
               to grant any extension of time for payment of any indebtedness
               evidenced by this Note or any other indulgence or forbearance
               whatsoever;

                    (4) agrees that no failure on the part of Holder to exercise
               any power, right or privilege hereunder, or to insist upon prompt
               compliance with the terms of this Note shall constitute a waiver
               of that power, right or privilege; and

                    (5) agrees that the acceptance at any time by Holder of any
               past due amounts shall not be deemed to be a waiver of the
               requirement to make prompt payment when due of any other amounts
               then or hereafter due and payable hereunder.

          8. Upon delivery of an affidavit in a form reasonably satisfactory to
     Debtor from the Holder or its agent as to the loss, theft, destruction or
     mutilation of this Note, and upon receipt of indemnity reasonably
     satisfactory to Debtor from Holder, or in the case of mutilation hereof,
     upon surrender of the mutilated Note, Debtor will make and deliver a new
     Note of like tenor in lieu of this Note and containing the same legend as
     herein.

          9. This Note shall be governed in all respects by the laws of the
     State of Illinois. Debtor covenants, and by the acceptance of this Note,
     Holder also covenants, that each irrevocably (a) waives, to the fullest
     extent permitted by law, any and all right to trial by jury in any legal
     proceeding arising out of this Note or any of the transactions contemplated
     hereby, (b) submits to the personal jurisdiction of the state courts
     located in Chicago, Illinois or, if the United States District Courts would
     otherwise have jurisdiction, the United States District Court located in
     Chicago, Illinois, and (c) waives any and all personal rights under the law
     of any jurisdiction to object on any basis (including, without limitation,
     inconvenience of forum) to jurisdiction or venue within the State of
     Illinois.

          10. In the event that Debtor defaults in payment of any Obligation due
     hereunder, Debtor shall pay all Holders' out-of-pocket collection costs,
     including without limitation reasonable attorneys' fees and legal costs,
     whether or not any suit or enforcement proceeding is commenced.

          11. This Subordinate Note is secured by a lien on certain assets of
     Debtor granted pursuant to that certain Security Agreement dated as of
     April 14, 1999

                                        WESTELL TECHNOLOGIES, INC.



                                       By:
                                             ----------------------------
                                             Name:
                                             Title:





                         SCHEDULE A TO SUBORDINATE NOTE
                     DATED __________, ___ IN THE AGGREGATE
                              PRINCIPAL AMOUNT OF $



                                      PERCENTAGE INTEREST
                                    IN AGGREGATE PRINCIPAL
                       PRINCIPAL           AMOUNT OF
     NOTEHOLDERS    AMOUNT OF NOTE     SUBORDINATE NOTES    ADDRESS FOR PAYMENT

     [NAME OF HOLDER]



     [NAME OF HOLDER]



     [NAME OF HOLDER]



     TOTAL           $___________            100%