REVOLVING NOTE

$16,000,000                                                    October 13, 1998


                  WESTELL TECHNOLOGIES, INC., WESTELL, INC., WESTELL
INTERNATIONAL, INC., AND CONFERENCE PLUS, INCORPORATED (collectively,
"Borrowers"),  hereby  jointly  and  severally  promise  to pay to the  order of
LaSalle  National  Bank (the  "Bank"),  on August 30, 1999 the  principal sum of
Sixteen  Million and No/100  ($16,000,000),  or such lesser amount of all of the
then outstanding  advances made by the Bank to Borrowers pursuant to Section 2.1
of the "Loan Agreement" (as hereinafter defined),  together with interest on any
and all principal  amounts remaining unpaid hereunder from time to time from the
date  hereof  until  paid,  at the  rate(s) set forth in Section 2.6 of the Loan
Agreement,  payable on the last day of each  "Interest  Period" (as such term is
defined in the Loan Agreement) and continuing until the Revolving Loans (as such
term is defined in the Loan Agreement) are paid in full.

                  Any amount of interest or  principal  hereof which is not paid
when due, whether on the last day of an Interest Period, at stated maturity,  by
acceleration or otherwise, shall bear interest payable on demand at the "Default
Rate" (as such term is defined in the Loan Agreement).

                  All payments of  principal  and interest on this Note shall be
payable in lawful money of the United  States of America.  In no event shall the
interest  payable  exceed the  highest  rate  permitted  by law.  Principal  and
interest  shall  be paid to Bank at its  office  at 135  South  LaSalle  Street,
Chicago,  Illinois  60603, or at such other place as the holder of this Note may
designate in writing to Borrowers.  All payments  hereunder  shall be applied as
provided in the Loan Agreement.  In determining Borrowers' liability to the Bank
hereunder,  the  books  and  records  of the Bank  shall be  controlling  absent
arithmetic or manifest error.

                  This Note evidences  certain  indebtedness  incurred under the
Loan and Security  Agreement,  dated as of the date hereof,  among Borrowers and
Bank (as  heretofore  or  hereafter  amended,  the "Loan  Agreement"),  to which
reference is hereby made for a statement of the terms and conditions under which
the due  date of this  Note or any  payment  thereon  may be  accelerated  or is
automatically  accelerated,  or  under  which  this  Note may be  prepaid  or is
required  to be  prepaid.  All  capitalized  terms  used  herein  shall,  unless
otherwise defined herein, have the meanings set forth in the Loan Agreement. The
holder of this Note is  entitled  to all of the  benefits  provided in said Loan
Agreement and the Loan Documents referred to herein.  Borrowers agree to pay all
costs of  collection  and all  reasonable  attorneys'  fees paid or  incurred in
enforcing any of the Bank's rights hereunder  promptly on demand of the Bank and
as more fully set forth in the Loan Agreement.

                  This  Note may be  prepaid  in whole or in part in  accordance
with the terms of the Loan Agreement.

                  Except  as set  forth in the Loan  Agreement,  the  Borrowers,
endorsers and all other parties to this Note waive presentment,  demand, notice,
protest  and all other  demands  and notices in  connection  with the  delivery,
acceptance,  performance,  default  or  enforcement  of this  Note  and the Loan
Agreement.  In any action on this Note,  the Bank or its assignee  need not file
the original of this Note, but need only file a photocopy of this Note certified
by the Bank or such assignee to be a true and correct copy of this Note.

                  This is the Revolving Note referred to in the Loan  Agreement.
This Note is  secured  by,  among  other  things,  a  security  interest  in the
Collateral granted to the Bank pursuant to Section 4 of the Loan Agreement.

                  No delay on the part of the Bank in exercising any right under
this Note, any security agreement,  guaranty or other undertaking affecting this
Note,  shall  operate  as a waiver of such right or any other  right  under this
Note,  nor shall any  omission in  exercising  any right on the part of the Bank
under this Note operate as a waiver of any other rights.

                  Upon the  occurrence  of an Event of  Default  under  the Loan
Agreement,  the outstanding  indebtedness  evidenced by this Note, together with
all accrued  interest,  shall be due and payable in accordance with the terms of
the Loan  Agreement,  without  notice to or demand upon the Borrowers  except as
otherwise  provided in the Loan Agreement,  and the Bank may exercise all of its
rights and remedies reserved to it under the Loan Agreement or applicable law.

                  If any  provision of this Note or the  application  thereof to
any party of  circumstance  is held invalid or  unenforceable,  the remainder of
this  Note  and  the   application   of  such  provision  to  other  parties  or
circumstances will not be affected thereby and the provisions of this Note shall
be severable in any such instance.

                  BORROWERS   HEREBY  WAIVE  ANY  RIGHT  BORROWERS  MAY  NOW  OR
HEREAFTER HAVE TO SUBMIT ANY CLAIM,  ISSUE OR DEFENSE ARISING HEREUNDER OR UNDER
THE OTHER DOCUMENTS RELATING TO THIS NOTE TO A TRIAL BY JURY.

                  This Note shall be deemed to have been made under and shall be
governed in accordance  with the internal laws and not the conflict of law rules
of the State of Illinois.

WESTELL TECHNOLOGIES, INC.


By:
Title:


WESTELL, INC.


By:_______________________________________
Title:_____________________________________


WESTELL INTERNATIONAL, INC.


By:______________________________________
Title:_____________________________________


CONFERENCE PLUS,  INCORPORATED

By:______________________________________
Title:_____________________________________