WESTELL TECHNOLOGIES INC
8-K, 1999-04-20
TELEPHONE & TELEGRAPH APPARATUS
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                             Washington, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT

     Pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported) April 16, 1999


                         WESTELL TECHNOLOGIES, INC.                 
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


    Delaware                     0-27266                  36-3154957 
    --------                     -------                  ---------- 
(State or other          (Commission File Number)        (IRS Employer
jurisdiction of                                        Identification No.)
incorporation)


750 N. Commons Drive, Aurora, Illinois                          60504  
- --------------------------------------------------------------------------------
(Address of principal executive offices)                     (Zip code)


(Registrant's telephone number, including area code)       800-323-6883

Item 5.  Other Events.

Private Placement

     On April 16, 1999, Westell Technologies, Inc. (the "Company") received a
$20 million investment from funds affiliated with three investors (the
"Buyers").

     Pursuant to the Securities Purchase Agreement dated as of April 14, 1999
among the Company, Castle Creek Technology Partner LLC, Marshall Capital
Management, Inc. and Capital Venture International, which is attached as an
exhibit to this Form 8-K (the "Securities Purchase Agreement"), the Company
issued and sold an aggregate of $20 million aggregate principal amount of 6%
Subordinated Convertible Debentures due April 15, 2004 (the "Convertible
Debentures") and warrants to purchase 909,091 shares (subject to adjustment) of
the Company's Class A Common Stock, $0.01 par value, (the "Warrants"). The offer
and sale of these securities in the United States was completed pursuant to the
exemption from registration provided by Regulation D under the Securities Act of
1933, as amended (the "Act"). In addition to the Convertible Debentures and
Warrants, and in connection with the investment, the Company and the Buyers have
entered into a Registration Rights Agreement, which agreement is attached as an
exhibit to this Form 8-K (the "Registration Rights Agreement").

     The Convertible Debentures are convertible into the Company's Class A
Common Stock, $0.01 par value. The conversion price will be the lower of (a) a
periodically reset fixed price that is initially $6.372 per share, and which
will reset on the 12 and 24-month anniversaries of April 16, 1999 to 105% of the
initial price (provided the fixed price may not be less than $4.4604 per share),
and (b) the floating market price of the Company's stock determined at time of
conversion (except that the floating market price may only be imposed under
specific conditions set forth in the Securities Purchase Agreement).

     The Warrants are exercisable at any time before 5:00 p.m. Central Standard
Time on April 15, 2004. The exercise price for the Class A Common Stock
underlying the Warrants is $8.9208 per share (subject to adjustment).

     Pursuant to the Registration Rights Agreement, the Company must file and

<PAGE>



maintain with the Securities and Exchange Commission a registration statement
for resale of shares acquired by the Buyers upon conversion of the debentures
and exercise of the Warrants.

     The foregoing description is only a summary and is qualified in its
entirety by reference to the Securities Purchase Agreement, the Convertible
Debentures, the Registration Rights Agreement, the Warrants and the other
agreements that are attached to this Form 8-K as exhibits, and incorporated
herein by reference.

     The proceeds from this investment will be used for working capital and
general corporate purposes.

Item 7.  Financial Statements and Exhibits.

(c) Exhibits.

Exhibit No.    Description

4.1            Securities Purchase Agreement dated as of April 14, 1999 by and
               among Westell Technologies, Inc., Castle Creek Technology
               Partners LLC, Marshall Capital Management, Inc. and Capital
               Ventures International, as Purchasers.

4.2            Form of 6% Subordinated Convertible Debenture dated April 15,
               1999 made by Westell Technologies, Inc. to the order of Castle
               Creek Technology Partners LLC in the amount of $9,000,000, to the
               order of Marshall Capital Management, Inc. in the amount of
               $6,000,000, and to the order of Capital Ventures International in
               the amount of $5,000,000.

4.3            Registration Rights Agreement dated April 15, 1999 by and among
               Westell Technologies, Inc., Castle Creek Technology Partners LLC,
               Marshall Capital Management, Inc. and Capital Ventures
               International.

4.4            Form of Stock Purchase Warrant dated April 15, 1999 by and among
               Westell Technologies, Inc., Castle Creek Technology Partners LLC
               (409,091 shares), Marshall Capital Management, Inc. (272,727
               shares), and Capital Ventures International (227,273 shares).

4.5            Form of Subordinated Note ("Cap Debenture").

4.6            Form of Security Agreement dated April 15, 1999 executed by
               Westell Technologies, Inc. in favor of Castle Creek Technology
               Partners LLC, Marshall Capital Management, Inc. and Capital
               Ventures International, as Purchasers.

10.16a         Amendment to Loan and Security Agreement dated as of February 24,
               1999 by and among LaSalle National Bank, Westell Technologies,
               Inc., Westell, Inc., Westell International, Inc. and Conference
               Plus, Inc.

10.16b         Second Amendment to Loan and Security Agreement dated as of April
               15, 1999 by and among LaSalle National Bank, Westell
               Technologies, Inc., Westell, Inc., Westell International, Inc.
               and Conference Plus, Inc.

10.16c         Subordination Agreement dated as of April 15, 1999, by and among
               Castle Creek Technology Partners LLC, Marshall Capital
               Management, Inc., Capital Ventures International and LaSalle
               National Bank.

99.1           Press Release issued April 16, 1999.


SIGNATURES

<PAGE>



          Pursuant to the requirements of the Securities Exchange Act of
1934, the registrant has duly caused this report to be signed on its behalf by
the undersigned thereunto duly authorized.


                                   WESTELL TECHNOLOGIES, INC.



Date:  April 20, 1999              /s/  Stephen J. Hawrysz
                                   ---------------------------------
                                        Stephen J. Hawrysz
                                        Vice President, Treasurer and
                                         Chief Financial Officer


                                  EXHIBIT INDEX

EXHIBIT        DESCRIPTION                                      PAGE NO.
NUMBER 


4.1            Securities Purchase Agreement dated as of April
               14, 1999 by and among Westell Technologies, Inc.,
               Castle Creek Technology Partners LLC, Marshall
               Capital Management, Inc. and Capital Ventures
               International, as Purchasers.

4.2            Form of 6% Subordinated Convertible Debenture
               dated April 15, 1999 made by Westell Technologies,
               Inc. to the order of Castle Creek Technology
               Partners LLC in the amount of $9,000,000, to the
               order of Marshall Capital Management, Inc. in the
               amount of $6,000,000, and to the order of Capital
               Ventures International in the amount of
               $5,000,000.

4.3            Registration Rights Agreement dated April 15, 1999
               by and among Westell Technologies, Inc., Castle
               Creek Technology Partners LLC, Marshall Capital
               Management, Inc. and Capital Ventures
               International.

4.4            Form of Stock Purchase Warrant dated April 15, 1999 by and among
               Westell Technologies, Inc., Castle Creek Technology Partners LLC
               (409,091 shares), Marshall Capital Management, Inc. (272,727
               shares), and Capital Ventures International (227,273 shares).

4.5            Form of Subordinated Note ("Cap Debenture").

4.6            Form of Security Agreement dated April 15, 1999
               executed by Westell Technologies, Inc. in favor of
               Castle Creek Technology Partners LLC, Marshall
               Capital Management, Inc. and Capital Ventures
               International, as Purchasers.

10.16a         Amendment to Loan and Security Agreement dated as
               of February 24, 1999 by and among LaSalle National
               Bank, Westell Technologies, Inc., Westell, Inc.,
               Westell International, Inc. and Conference Plus,
               Inc.

10.16b         Second Amendment to Loan and Security Agreement
               dated as of April 15, 1999 by and among LaSalle

<PAGE>



               National Bank, Westell Technologies, Inc.,
               Westell, Inc., Westell International, Inc. and
               Conference Plus, Inc.

10.16c         Subordination Agreement dated as of April 15, 1999, by and among
               Castle Creek Technology Partners LLC, Marshall Capital
               Management, Inc., Capital Ventures International and LaSalle
               National Bank.

99.1           Press Release issued April 16, 1999.




                                                                  EXECUTION COPY

                          SECURITIES PURCHASE AGREEMENT


         This SECURITIES PURCHASE AGREEMENT ("Agreement") is entered into as of
April 14, 1999, by and between Westell Technologies, Inc., a Delaware
corporation (the "Company"), with headquarters located at 750 N. Commons Drive,
Aurora, Illinois 60504, and the purchasers (each a "Purchaser" and together the
"Purchasers") set forth on the execution pages hereof, with regard to the
following:

                                    RECITALS

         A. The Company and Purchasers are executing and delivering this
Agreement in reliance upon the exemption from securities registration afforded
by the provisions of Regulation D ("Regulation D"), as promulgated by the United
States Securities and Exchange Commission (the "SEC") under the Securities Act
of 1933, as amended (the "Securities Act").

         B. Purchasers desire to purchase, and the Company desires to issue and
sell, upon the terms and conditions stated in this Agreement, (i) an amount of
the Company's 6% Subordinated Convertible Debentures (the "Debentures") in the
form of Exhibit A which is convertible into shares of the Company's Class A
Common Stock, par value $0.01 per share (the "Class A Common Stock" and, when
taken together with all other classes and series of the Company's common stock,
the "Common Stock"), (ii) warrants in the form of Exhibit B (each a "Warrant"
and, when taken together with all of the warrants issued hereunder, the
"Warrants") entitling the holder thereof to purchase the number of shares (the
"Warrant Shares") of Class A Common Stock as set forth below. The Debentures and
the PIK Debentures (as defined in the Debenture) are collectively referred to
herein as the "Convertible Securities". The shares of Class A Common Stock
issuable upon conversion of or otherwise pursuant to the Convertible Securities
are referred to herein as the "Conversion Shares." The Convertible Securities,
the Warrants, the Cap Debentures (as defined in the Debenture), the Conversion
Shares and the Warrant Shares are collectively referred to herein as the
"Securities".

         C. Contemporaneously with the execution and delivery of this Agreement,
the parties hereto are executing and delivering a Registration Rights Agreement
in the form attached hereto as Exhibit C (the "Registration Rights Agreement"),
pursuant to which the Company has agreed to provide certain registration rights
under the Securities Act, the rules and regulations promulgated thereunder and
applicable state securities laws.

                                   AGREEMENTS

         NOW, THEREFORE, in consideration of their respective promises contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the Company and Purchasers hereby agree as
follows:

                                    ARTICLE I
                    PURCHASE AND SALE OF SECURITIES; SECURITY

         1.1 Purchase of Debentures and Warrants. The purchase price (the
"Purchase Price") to be paid by each Purchaser for the Debenture and Warrant
being purchased by such Purchaser and the allocation of the Purchase Price as
between such Debenture and Warrant shall be as set forth on each Purchaser's
signature page.


         On the date of the Closing (as defined herein), subject to the terms
and the satisfaction (or waiver) of the conditions set forth in Articles VI and
VII, and notwithstanding any election by the Company, the Company shall issue
and sell to each Purchaser, and each Purchaser shall purchase from the Company
(i) a Debenture in principal amount equal to the Purchase Price set forth below
such Purchaser's name on the signature pages hereof and (ii) a Warrant entitling
the holder thereof to purchase the number of Warrant Shares set forth below such
Purchaser's name on the signature pages hereto. The aggregate purchase price for
the Securities purchased at the Closing shall be twenty million dollars
($20,000,000).

         1.2 Form of Payment. At the Closing, each Purchaser shall pay the
Purchase Price for the Purchased Securities being purchased by such Purchaser by
wire transfer to the Company, in accordance with the Company's written wiring
instructions, against delivery of duly executed Debentures and Warrants, and the
Company shall deliver to each Purchaser such executed Debentures and Warrants
against delivery of such Purchase Price from each Purchaser. The obligations in
this Agreement of each Purchaser shall be separate from the obligations of each
other Purchaser and shall relate solely to the Purchased Securities to be
purchased by such Purchaser. The obligations of the Company with respect to each
Purchaser shall be separate from the obligations of the Company to each other
Purchaser and shall not be conditioned as to any Purchaser upon the performance
of the obligations of any other Purchaser. At the Closing and thereafter, the
Company shall cause each of its subsidiaries to enter into such security
agreements and perform such obligations as are contemplated by this Agreement
and such security agreements and the transactions contemplated hereby and
thereby.

         1.3 Closing Date. The date and time of the issuance, sale and purchase
of the Securities pursuant to this Agreement shall be the later of (i) the day
following the date of this Agreement and (ii) the date upon which all the
conditions set forth in Articles VI and VII are satisfied or waived. The Closing
shall occur at 11:00 a.m. Chicago time, at the offices of Altheimer & Gray, 10
S. Wacker Drive, Chicago, IL 60606. The date of the Closing is hereinafter
referred to as the "Closing Date."

                                   ARTICLE II
                   PURCHASER'S REPRESENTATIONS AND WARRANTIES

         Each Purchaser represents and warrants on the date hereof, solely with
respect to itself and its purchase hereunder and not with respect to any other
Purchaser or the purchase hereunder by any other Purchaser (and no Purchaser
shall be deemed to make or have any liability for any representation or warranty
made by any other Purchaser), to the Company as set forth in this Article II. No
Purchaser makes any other representations or warranties, express or implied, to
the Company in connection with the transactions contemplated hereby and any and
all prior representations and warranties, if any, which may have been made by a
Purchaser to the Company in connection with the transactions contemplated hereby
shall be deemed to have been merged in this Agreement and any such prior
representations and warranties, if any, shall not survive the execution and
delivery of this Agreement.

         2.1 Purchase for Own Account. Purchaser is purchasing the Securities
for Purchaser's own account for investment only and not with a view toward or in
connection with the public resale or distribution thereof, except pursuant to
sales that are exempt from the registration requirements of the Securities Act
and/or sales registered under the Securities Act. Purchaser will not resell any
of the Securities or any securities which may be issued upon exchange or
conversion thereof except pursuant to sales that are exempt from the
registration requirements of the Securities Act and/or sales registered under
the Securities Act. Purchaser understands that Purchaser must bear the economic
risk of this investment indefinitely, unless the Securities are registered
pursuant to the Securities Act and any applicable state securities laws or an
exemption from such registration is available, and that the Company has no
present intention of registering any such Securities other than as contemplated
by the Registration Rights Agreement. By making the representations in this
Section 2.1, the Purchaser does not agree to hold any Securities for any minimum
or other specific term and reserves the right to dispose of any or all of the
Securities at any time in accordance with or pursuant to a registration
statement or an exemption from registration under the Securities Act.

         2.2 Accredited Investor Status. Purchaser is an "accredited investor"
as that term is defined in Rule 501(a) of Regulation D.


         2.3 Reliance on Exemptions. Purchaser understands that the Securities
are being offered and sold to Purchaser in reliance upon specific exemptions
from the registration requirements of the United States federal and state
securities laws and that the Company is relying upon the truth and accuracy of
the representations and warranties of Purchaser set forth herein in order to
determine the availability of such exemptions and the eligibility of Purchaser
to acquire the Securities.


         2.4 Information. Purchaser and its counsel have been furnished all
materials relating to the business, finances and operations of the Company and
materials relating to the offer and sale of the Securities which have been
specifically requested by Purchaser. Purchaser has been afforded the opportunity
to ask questions of the Company and has received what Purchaser believes to be
complete and satisfactory answers to any such inquiries. Neither such materials
or inquiries nor any other due diligence investigation conducted by Purchaser
nor any of its representations, warranties, covenants or agreements shall
modify, amend or affect Purchaser's right to rely on the Company's
representations and warranties contained in Article III. Purchaser understands
that Purchaser's investment in the Securities involves a high degree of risk.

         2.5 Governmental Review. Purchaser understands that no United States
federal or state agency or any other government or governmental agency has
passed upon or made any recommendation or endorsement of the Securities or an
investment therein.

         2.6 Transfer or Resale. Purchaser understands that (i) except as
provided in the Registration Rights Agreement, the Securities have not been and
are not being registered under the Securities Act or any state securities laws,
and may not be transferred unless subsequently registered thereunder or an
exemption from such registration is available (which exemption the Company
expressly agrees may be established as contemplated in clauses (b) and (c) of
Section 5.1 hereof or as otherwise may be permissible under the Securities Act);
(ii) any sale of such Securities made in reliance on Rule 144 under the
Securities Act (or a successor rule) ("Rule 144") may be made only in accordance
with the terms of said Rule and further, if said Rule is not applicable, any
resale of such Securities without registration under the Securities Act) may
require compliance with some other exemption under the Securities Act or the
rules and regulations of the SEC thereunder; and (iii) neither the Company nor
any other person is under any obligation to register such Securities under the
Securities Act or any state securities laws or to comply with the terms and
conditions of any exemption thereunder (in each case, other than pursuant to
this Agreement or the Registration Rights Agreement).

         2.7 Legends. Purchaser understands that, subject to Article V hereof,
the certificates for the Debentures, Warrants, the Conversion Shares and the
Warrant Shares will bear a restrictive legend (the "Legend") in the following
form:

THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE OF
THE UNITED STATES. THE SECURITIES REPRESENTED HEREBY MAY NOT BE OFFERED OR SOLD
OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT
FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS OR UNLESS OFFERED, SOLD OR
TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION FROM THE REGISTRATION
REQUIREMENTS OF THOSE LAWS.

Except for the Legend in accordance with this Section 2.7 and Section 5.1 hereof
and the legend required by the Subordination Agreement (as defined in Section
7.1), the Securities shall bear no other legend.

         2.8 Authorization; Enforcement. This Agreement and the Registration
Rights Agreement have been duly and validly authorized, executed and delivered
on behalf of Purchaser and are valid and binding agreements of Purchaser
enforceable against Purchaser in accordance with their terms.

         2.9 Residency. Purchaser is a resident of the jurisdiction set forth
under Purchaser's name on the signature page hereto executed by Purchaser.

                                   ARTICLE III
                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         The Company represents and warrants to each Purchaser on the date
hereof that, except for such exceptions which are (a) specifically disclosed in
that certain disclosure letter delivered by the Company to each Purchaser
concurrently with the execution and delivery of this Agreement by the Company
and (b) schedules hereto numbered to conform with the applicable Sections of
this Article III with respect to which such exception is being made:

         3.1 Organization and Qualification. The Company and each of its
subsidiaries is a corporation duly organized, validity existing and in good
standing under the laws of the jurisdiction in which it is incorporated, and has
the requisite corporate power and authority to own its properties and to carry
on its business as now being conducted. The Company and each of its subsidiaries
is duly qualified as a foreign corporation to do business and is in good
standing in every jurisdiction where the failure to so qualify would have a
Material Adverse Effect. "Material Adverse Effect" means any material adverse
effect on (i) the business, operations, properties, financial condition,
operating results or prospects of the Company and its subsidiaries, taken as a
whole on a consolidated basis, (ii) the transactions contemplated hereby, (iii)
the ability of the Company to perform its obligations under this Agreement, the
Debentures, the Warrants or the Registration Rights Agreement (collectively, the
"Investment Agreements") or (iv) the Purchaser's interest in the Securities. A
"Material Adverse Effect" shall not include (i) adverse general economic
conditions, (ii) adverse general industry conditions in the industry in which
the Company operates or (iii) of itself, a decline in the Company's stock price.

         3.2 Authorization; Enforcement. (a) The Company has the requisite
corporate power and authority to (i) enter into, and perform its obligations
under each of the Investment Agreements, (ii) issue, sell and perform its
obligations with respect to the Debentures and the Warrants in accordance with
the terms hereof and thereof, and (v) issue the Conversion Shares in accordance
with the terms and conditions of the Debentures and the Warrant Shares in
accordance with the terms and conditions of the Warrants; (b) the execution,
delivery and performance of this Agreement and the Registration Rights Agreement
by the Company and the execution and delivery of the Debentures and the
Warrants, and the consummation by it of the transactions contemplated hereby and
thereby (including without limitation the issuance of the Convertible Securities
and the Cap Debentures and the reservation for issuance and issuance of the
Shares and the Conversion Shares) have been duly authorized by all necessary
corporate action and, except as set forth on Schedule 3.2 hereof, no further
consent or authorization of the Company, its board of directors, or its
stockholders or any other person, body or agency is required with respect to any
of the transactions contemplated hereby or thereby (whether under rules of the
Nasdaq National Market System ("Nasdaq"), the National Association of Securities
Dealers or otherwise); (c) this Agreement, the Debentures, the Warrants and the
Registration Rights Agreement have been duly executed and delivered by the
Company and upon the issuance by the Company of PIK Debentures or Cap
Debentures, such PIK Debentures and Cap Debentures will be duly executed and
delivered by the Company; and (d) each of the Investment Agreements constitutes
a legal, valid and binding obligation of the Company enforceable against the
Company in accordance with their terms.

         3.3 Capitalization. The capitalization of the Company as of the date of
this Agreement, including the authorized capital stock, the number of shares
issued and outstanding, the number of shares reserved for issuance pursuant to
the Company's stock option plans, the number of shares reserved for issuance
pursuant to securities (other than the Convertible Securities and the Warrants)
exercisable for, or convertible into or exchangeable for any shares of Common
Stock and the number of shares to be initially reserved for issuance upon
conversion of the Convertible Securities and the exercise of the Warrants is set
forth on Schedule 3.3. All of such outstanding shares of capital stock have
been, or upon issuance will be, validly issued, fully paid and non-assessable.
No shares of capital stock of the Company (including the Warrant Shares and the
Conversion Shares) are subject to preemptive rights or any other similar rights
of the stockholders of the Company or any liens or encumbrances. Except as
disclosed in Schedule 3.3, as of the date of this Agreement, (i) there are no
outstanding options, warrants, scrip, rights to subscribe for, calls or
commitments of any character whatsoever relating to, or securities or rights
convertible into or exercisable or exchangeable for, any shares of capital stock
of the Company or any of its subsidiaries, or contracts, commitments,
understandings or arrangements by which the Company or any of its subsidiaries
is or may become bound to issue additional shares of capital stock of the
Company or any of its subsidiaries, and (ii) there are no agreements or
arrangements under which the Company or any of its subsidiaries is obligated to
register the sale of any of its or their securities under the Securities Act
(except the Registration Rights Agreement). The Company has furnished to
Purchaser true and correct copies of the Company's Certificate of Incorporation
as currently in effect ("Certificate of Incorporation"), and the Company's
Bylaws as currently in effect (the "By-laws"). The Company has set forth on
Schedule 3.3 all instruments and agreements (other than the Certificate of
Incorporation and By-laws) governing securities convertible into or exercisable
or exchangeable for Common Stock of the Company (and the Company shall provide
to Purchaser copies thereof upon the request of Purchaser). Except as set forth
on Schedule 3.3, the Company has no indebtedness for borrowed money and no
agreement providing for indebtedness for borrowed money. Except as disclosed on
Schedule 3.3, the Company has no share purchase agreements, rights plans or
agreements containing similar provisions and no agreements containing
anti-dilution provisions. The Company shall provide Purchaser with a written
update of this representation signed by the Company's Chief Executive Officer or
Chief Financial Officer on behalf of the Company as of the date of the Closing
and it shall be a condition to Purchaser's obligations at Closing that there are
no material changes in such capitalization since the Company's representation on
the date hereof. The Company has no subsidiaries, except as provided on Schedule
3.3. Except as set forth on Schedule 3.3, all such subsidiaries included on
Schedule 3.3. are one hundred percent (100%) owned by the Company. Except as
provided on Schedule 3.3, the Company has no investments, either debt or equity,
in any other entity except for marketable securities. The Loan Agreement (as
herein defined) as of the date of this Agreement has been delivered to
Purchaser.

         3.4 Issuance of Shares. The Conversion Shares and Warrant Shares are
duly authorized and reserved for issuance, and, upon conversion of the
Convertible Securities or exercise of the Warrants, each in accordance with the
terms thereof, will be validly issued, fully paid and non-assessable, and free
from all taxes, liens, claims and encumbrances and will not be subject to
preemptive rights or other similar rights of stockholders of the Company. The
Convertible Securities and Warrants are duly authorized and reserved for
issuance, and are validly issued, fully paid and non-assessable, and free from
all taxes, liens claims and encumbrances and are not and will not be subject to
preemptive rights or other similar rights of stockholders of the Company. The
Board of Directors of the Company (the "Board") has the right to consent to or
to block pursuant to the terms of the Convertible Securities (the "Cap Debenture
Election") the issuance of shares of Class A Common Stock in excess of twenty
percent (20%) of the outstanding shares of Common Stock upon conversion of the
Convertible Securities pursuant to the terms thereof. The Board has unanimously
approved the issuance of shares of Common Stock pursuant to this Agreement, upon
conversion of the Convertible Securities and upon the exercise of the Warrants
pursuant to the terms thereof, including the circumstance where such conversion
would, in the aggregate, require issuance in excess of twenty percent (20%) of
the outstanding shares of Common Stock (the "Rule 4460(i) Authorization"). No
further corporate authorization or approval (other than the authorization and
approval of the Rule 4460(i) Authorization by the shareholders of the Company (
the "Shareholder Approval")) is required under the rules of the Nasdaq with
respect to the transaction contemplated by this Agreement, including, without
limitation, the issuance of the Conversion Shares and the Warrant Shares and the
inclusion thereof for trading on the Nasdaq.

         3.5 No Conflicts. The execution, delivery and performance of each of
the Investment Agreements, by the Company and the consummation by the Company of
the transactions contemplated hereby and thereby (including the issuance and
reservation for issuance, as applicable, of the PIK Debentures, the Cap
Debentures, the Warrant Shares and the Conversion Shares) do not and will not
(a) result in a violation of the Certificate of Incorporation or By-laws of the
Company or any of its subsidiaries, (b) conflict with, or constitute a default
(or an event which with notice or lapse of time or both would become a default)
under, or give to others any rights of termination, amendment, acceleration or
cancellation of, any agreement, indenture or instrument to which the Company or
any of its subsidiaries is a party (except for such conflicts, defaults,
terminations, amendments, accelerations, and cancellations as would not,
individually or in the aggregate, have a Material Adverse Effect), or (c) result
in a violation of any law, rule, regulation, order, judgment or decree
(including, without limitation, U.S. federal and state securities laws and
regulations) applicable to the Company or any of its subsidiaries, or by which
any property or asset of the Company or any of its subsidiaries, is bound or
affected which would have a Material Adverse Effect. Neither the Company nor any
of its subsidiaries is in violation of its Certificate of Incorporation, by-laws
or other organizational documents, and neither the Company nor any of its
subsidiaries is in default (and no event has occurred which, with notice or
lapse of time or both, would put the Company or any of its subsidiaries in
default) under, nor has there occurred any event giving others (with notice or
lapse of time or both) any rights of termination, amendment, acceleration or
cancellation of, any agreement, indenture or instrument to which the Company or
any of its subsidiaries is a party, except for possible defaults or rights as
would not, individually or in the aggregate, have a Material Adverse Effect. The
business of the Company and its subsidiaries is not being conducted, and shall
not be conducted so long as a Purchaser owns any of the Securities, in violation
of any law, ordinance, rule, regulation, order, judgment or decree of any
governmental entity, court or arbitration tribunal except for possible
violations the sanctions for which either singly or in the aggregate would not
have a Material Adverse Effect. The Company is not required to obtain any
consent, authorization or order of, or make any filing or registration with, any
court or governmental agency or any regulatory or self-regulatory agency in
order for it to execute, deliver or perform any of its obligations under any of
the Investment Agreements or to perform its obligations in accordance with the
terms hereof or thereof. The purchase and acquisition of the Securities by the
Purchaser does not violate any law, rule, regulation, order, judgment or decree
applicable to the Company, or require further filing by the Company or Purchaser
under such law, rule, regulation, order, judgment or decree, by virtue of the
Company's business or assets (it being understood that for the purposes of this
sentence, the Company is relying upon the Purchaser's representations and
warranties in Article 2 hereof). The Company is not in violation of the listing
requirements of Nasdaq and does not reasonably anticipate that the Common Stock
will be de-listed by Nasdaq for the foreseeable future, and the Company has made
all necessary filings and notifications with, and obtained all necessary
approvals from, Nasdaq with respect to the transactions contemplated hereby,
including, without limitation, the issuance of the Securities and the listing of
the Conversion Shares and the Warrant Shares on the Nasdaq.

         3.6 Registration and SEC Documents. The Common Stock is registered
under Section 12 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act") and has been so registered since November 30, 1995. Except as
disclosed in Schedule 3.6, since March 31, 1998, the Company has timely filed
all reports, schedules, forms, statements and other documents required to be
filed by it with the SEC pursuant to the reporting requirements of the Exchange
Act (all of the foregoing filed after March 31, 1998 and all exhibits included
therein and financial statements and schedules thereto and documents
incorporated by reference therein, being referred to herein as the "SEC
Documents"). The Company has delivered to each Purchaser true and complete
copies of the SEC Documents (the SEC documents filed prior to the date hereof,
the "Filed SEC Documents"). As of their respective dates, the SEC Documents
complied in all material respects with the requirements of the Exchange Act and
the rules and regulations of the SEC promulgated thereunder applicable to the
SEC Documents, and none of the SEC Documents, at the time they were filed with
the SEC, contained any untrue statement of a material fact or omitted to state a
material fact required to be stated therein or necessary in order to make the
statements therein, in light of the circumstances under which they were made,
not misleading. None of the statements made in any such SEC Document is, or has
been, required to be updated or amended under applicable law. The financial
statements of the Company included in the SEC Documents were prepared in
accordance with U.S. generally accepted accounting principles, consistently
applied, and the rules and regulations of the SEC during the periods involved
(except (i) as may be otherwise indicated in such financial statements or the
notes thereto, or (ii) in the case of unaudited interim statements, to the
extent they do not include footnotes or are condensed or summary statements) and
present accurately and completely the consolidated financial position of the
Company and its consolidated subsidiaries as of the dates thereof and the
consolidated results of their operations and cash flows for the periods then
ended (subject, in the case of unaudited statements, to normal, immaterial
year-end audit adjustments). Except as set forth in the financial statements of
the Company included in the Filed SEC Documents, the Company has no liabilities,
contingent or otherwise, other than (i) liabilities incurred subsequent to the
date of such financial statements in the ordinary course of business consistent
with past practice and (ii) obligations under contracts and commitments incurred
in the ordinary course of business and not required under generally accepted
accounting principles to be reflected in such financial statements, in each case
of clause (i) and (ii) next above which, individually or in the aggregate, would
not reasonably be expected to have a Material Adverse Effect. The Filed SEC
Documents, as supplemented by Schedule 3.6 hereto, contain a complete and
accurate list of all material undischarged written or oral contracts,
agreements, leases or other instruments to which the Company or any subsidiary
is a party or by which the Company or any subsidiary is bound or to which any of
the properties or assets of the Company or any subsidiary is subject (each a
"Contract"). None of the Company, its subsidiaries or, to the best knowledge of
the Company, any of the other parties thereto, is in breach or violation of any
Contract, which breach or violation relates to indebtedness for borrowed money,
is with respect to an obligation in excess of twenty five thousand dollars
($25,000) or would have a Material Adverse Effect. No event, occurrence or
condition exists which, with the lapse of time, the giving of notice, or both,
or the happening of any further event or condition, would become a breach or
default by the Company or its subsidiaries under any Contract which breach or
default would have a Material Adverse Effect.

         3.7 Absence of Certain Changes. Since December 31, 1998, there has been
no material adverse change and no material adverse development in the business,
properties, operations, financial condition, results of operations or prospects
of the Company, except as disclosed in Schedule 3.7.

         3.8 Absence of Litigation. Except as disclosed in Schedule 3.8, there
is no action, suit, proceeding, inquiry or investigation before or by any court,
public board, governmental agency or authority, or self-regulatory organization
or body pending or, to the knowledge of the Company or any of its subsidiaries,
threatened against or affecting the Company, any of its subsidiaries, or any of
their respective directors or officers in their capacities as such, wherein an
unfavorable decision, ruling or finding could have a Material Adverse Effect or
would adversely affect the transactions contemplated by this Agreement or any of
the documents contemplated hereby or which would adversely affect the validity
or enforceability of, or the authority or ability of the Company to perform its
obligations under, this Agreement or any of such other documents. There are no
facts which, if known by a potential claimant or governmental agency or
authority, could give rise to a claim or proceeding which, if asserted or
conducted with results unfavorable to the Company or any of its subsidiaries,
could have a Material Adverse Effect.

         3.9 Disclosure. No information relating to or concerning the Company
set forth in this Agreement or provided to Purchaser in connection with the
transactions contemplated hereby contains an untrue statement of a material fact
or omits to state a material fact necessary in order to make the statements made
herein or therein, in light of the circumstances under which they were made, not
misleading. Except for the execution and performance of this Agreement, no
material fact (within the meaning of the federal securities laws of the United
States) exists with respect to the Company or any of its subsidiaries which has
not been publicly disclosed.

         3.10 Acknowledgment Regarding Purchaser's Purchase of the Securities.
The Company acknowledges and agrees that each Purchaser is acting independently
and is not acting as a financial advisor or fiduciary of the Company (or in any
similar capacity) with respect to this Agreement or the transactions
contemplated hereby, that this Agreement and the transaction contemplated
hereby, and the relationship between each Purchaser and the Company, are
"arms-length", and that, except for Purchasers' representations in Article 2
hereof, any statement made by any Purchaser, or any of its representatives or
agents, in connection with this Agreement or the transactions contemplated
hereby is not advice or a recommendation, is merely incidental to such
Purchaser's purchase of the Securities and has not been relied upon in any way
by the Company, its officers, directors or other representatives. The Company
further represents to Purchaser that the Company's decision to enter into this
Agreement and the transactions contemplated hereby has been based solely on an
independent evaluation by the Company and its representatives.

         3.11 Current Public Information. On the date hereof, the Company is
currently eligible to register the resale of the Conversion Shares and Warrant
Shares by the Purchasers on a registration statement on Form S-3 under the
Securities Act.

         3.12 No General Solicitation. Neither the Company nor any person acting
on behalf of the Company has conducted any "general solicitation," as described
in Rule 502(c) under Regulation D, with respect to any of the Securities being
offered hereby.

         3.13 No Integrated Offering. Neither the Company, nor any of its
affiliates, nor any person acting on its or their behalf, has directly or
indirectly made any offers or sales of any security or solicited any offers to
buy any security under circumstances that would prevent the parties hereto from
consummating the transactions contemplated hereby pursuant to an exemption from
registration under the Securities Act pursuant to the provisions of Regulation
D. The transactions contemplated hereby are exempt from the registration
requirements of the Securities Act, assuming the accuracy of the representations
and warranties herein contained of each Purchaser to the extent relevant for
such determination.

         3.14 No Brokers. The Company has taken no action which would give rise
to any claim by any person for brokerage commissions, finder's fees or similar
payments by Purchaser relating to this Agreement or the transactions
contemplated hereby, except for dealings with Hambrecht & Quist LLC (the fees of
which shall be paid in full by the Company).

         3.15 Acknowledgment of Dilution. The number of Conversion Shares
issuable upon conversion of the Convertible Securities and/or Warrant Shares
issuable upon exercise of the Warrants may increase substantially in certain
circumstances, including the circumstance wherein the trading price of the
Common Stock declines. The Company's executive officers and directors have
studied and fully understand the terms of this Agreement and the transactions
contemplated hereby and the nature of the securities being sold hereunder and
recognize that they have a potential dilutive effect. The board of directors of
the Company has unanimously concluded in its good faith business judgment that
the issuance of the Securities as contemplated hereby is in the best interests
of the Company. The Company acknowledges that its obligation to issue Conversion
Shares upon conversion of the Convertible Securities and the Warrant Shares upon
exercise of the Warrants is binding upon it and enforceable regardless of the
dilution that such issuance may have on the ownership interests of other
stockholders.

         3.16 Intellectual Property. Each of the Company and its subsidiaries
owns or possesses adequate and enforceable rights to use all patents, patent
applications, trademarks, trademark applications, trade names, service marks,
copyrights, copyright applications, licenses, know-how (including trade secrets
and other unpatented and/or unpatentable proprietary or confidential
information, systems or procedures) and other similar rights and proprietary
knowledge (collectively, "Intangibles ") used or necessary for the conduct of
its business as now being conducted and as previously described in the Company's
Annual Report on Form 10-K most recently filed and any subsequently filed
reports on Form 10-Q and Form 8-K. Neither the Company nor any subsidiary of the
Company infringes on or is in conflict with any right of any other person with
respect to any Intangibles nor is there any claim of infringement made by a
third party against or involving the Company or any of its subsidiaries, which
infringement, conflict or claim, individually or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, would have a Material
Adverse Effect.

         3.17 Foreign Corrupt Practices. Neither the Company, nor any of its
subsidiaries, nor any director, officer and, to the best knowledge of the
Company, agent, employee or other person acting on behalf of the Company or any
subsidiary has, in the course of his actions for, or on behalf of, the Company,
used any corporate funds for any unlawful contribution, gift, entertainment or
other unlawful expenses relating to political activity; made any direct or
indirect unlawful payment to any foreign or domestic government official or
employee from corporate funds; violated or is in violation of any provision of
the U.S. Foreign Corrupt Practices Act of 1977, as amended; or made any bribe,
rebate, payoff, influence payment, kickback or other unlawful payment to any
foreign or domestic government official or employee. Without limiting the
generality of the foregoing, the Company and its subsidiaries have not directly
or indirectly made or agreed to make (whether or not said payment is lawful) any
payment to obtain, or with respect to, sales other than usual and regular
compensation to its or their employees and sales representatives with respect to
such sales.

         3.18 Key Employees. Each Key Employee (as defined below) is currently
serving the Company in the capacity disclosed in Schedule 3.18. No Key Employee,
to the best of the knowledge of the Company and its subsidiaries, is, or is now
expected to be, in violation of any material term of any employment contract,
confidentiality, disclosure or proprietary information agreement,
non-competition agreement, or any other contract or agreement or any restrictive
covenant, and the continued employment of each Key Employee does not subject the
Company or any of its subsidiaries to any liability with respect to any of the
foregoing matters. No Key Employee has, to the best of the knowledge of the
Company and its subsidiaries, any intention to terminate or limit his employment
with, or services to, the Company or any of its subsidiaries, nor is any such
Key Employee subject to any constraints (e.g., litigation) which would cause
such employee to be unable to devote his full time and attention to such
employment or services. "Key Employee" means each of Marc Zionts, J. William
Nelson, Stephen J. Hawrysz, Richard P. Reviere, Marc Hafner and William Noll.

         3.19 Solvency. Immediately before and after giving effect to the
transactions contemplated by this Agreement, the Company (i) has not incurred
and does not intend to incur, or believe that it will incur, debts beyond its
ability to pay such debts as they become due, (ii) owns and will have assets,
the fair saleable value of which is (a) greater than the total amount of its
liabilities (including contingent liabilities) and (b) greater than the amount
that will be required to pay the probable liabilities of its then existing debts
as they become absolute and matured, and (iii) has and will have capital that is
not unreasonably small in relation to its business as presently conducted and as
proposed to be conducted.

         3.20 Year 2000 Compliance. The information set forth in the Filed SEC
Documents with respect to Year 2000-related compliance by the Company does not
contain any untrue statement of a material fact or omit any material fact
necessary to make the statements contained therein not misleading. Management of
the Company believes in good faith that Seller's testing compliance program and
contingency plan, in each case regarding Year 2000-related matters, are adequate
to prevent a Material Adverse Effect.

                                   ARTICLE IV
                                    COVENANTS

         4.1 Best Efforts. The Company shall use its best efforts timely to
satisfy each of the conditions described in Articles VI and VII of this
Agreement.


         4.2 Securities Laws. The Company agrees to file a Form D with respect
to the Securities with the SEC as required under Regulation D and to provide a
copy thereof to each Purchaser on or prior to the date of the Closing. The
Company agrees to file a Form 8-K disclosing this Agreement and the transactions
contemplated hereby with the SEC as soon as possible, but in any event within
two (2) business days following the date of Closing. Such Form 8-K shall contain
as exhibits this Agreement, the form of Debenture, the form of Warrant and the
Registration Rights Agreement. The Company shall, on or prior to the date of the
Closing, take such action as is necessary to sell the Securities to each
Purchaser in accordance with applicable securities laws of the states of the
United States, and shall provide evidence of any such action so taken to each
Purchaser on or prior to the date of the Closing. Without limiting any of the
Company's obligations under any Investment Agreement from and after the date of
the Closing, neither the Company nor any person acting on its behalf shall take
any action which would adversely affect any exemptions from registration under
the Securities Act with respect to the transactions contemplated hereby.

         4.3 Reporting Status. So long as any Purchaser beneficially owns any of
the Securities, the Company shall timely file all reports required to be filed
with the SEC pursuant to the Exchange Act, and the Company shall not terminate
its status as an issuer required to file reports under the Exchange Act even if
the Exchange Act or the rules and regulations thereunder would permit such
termination.

         4.4 Use of Proceeds. The Company shall use the proceeds from the sale
of the Securities for working capital and general corporate purposes; pending
such uses, the Company intends to invest the proceeds in short-term
interest-bearing securities.

         4.5 Restriction on Issuance of Securities. (a) For a period beginning
on the date hereof and ending one hundred and eighty (180) days after the date
of the Closing, the Company shall not issue or agree to issue, (except (i) to
Purchasers pursuant to this Agreement, the Convertible Securities or the
Warrants, (ii) equity securities issued in a public offering, (iii) equity
securities issued as payment for corporate acquisitions, (and issuances of
convertible securities, options and rights in exchange for equivalent
outstanding instruments of the other business combination party, to the extent
required by its terms) (iv) shares of Class A Common Stock issued upon
conversion of shares of Class B Common Stock, or (v) stock options issued to
directors, officers and employees pursuant to any employee stock option, stock
purchase or restricted stock plan of the Company in effect on the date hereof up
to the aggregate amounts set forth on Schedule 4.5 hereto), any equity
securities, any equity-like or any equity-linked securities (or any security
convertible into or exercisable or exchangeable, directly or indirectly, for
equity, equity-like or equity-linked securities of the Company) (each of the
foregoing being a "Restricted Security"). At the Closing, the Company will
deliver to each Purchaser a letter in the form of Exhibit G providing a right of
first refusal to such Purchaser with respect to future issuances of securities
by the Company which occur during the period beginning six (6) months after the
date of the Closing and ending twelve (12) months after the date of the Closing.

         4.6 Expenses. The Company shall pay to each Castle Creek Technology
Partners LLC ("CCTP"), or at its direction, at the Closing, reimbursement for
the expenses incurred by it and its affiliates and advisors in connection with
the negotiation, preparation, execution, and delivery of this Agreement and the
other agreements and documents to be executed in connection herewith, including,
without limitation, CCTP's and its affiliates' and advisors' due diligence and
attorneys' fees and expenses (the "Expenses"); provided, however, that such
reimbursement of Expenses shall not exceed $60,000. In addition, from time to
time thereafter, upon CCTP's written request, subject to such $60,000 limit, the
Company shall pay to CCTP such Expenses, if any, not so paid at the Closing
and/or covered by such payment, in each case to the extent incurred by CCTP.

         4.7 Information. The Company agrees to send the following reports to
each Purchaser until such Purchaser transfers, assigns or sells all of its
Securities: (a) within three (3) days after the filing with the SEC, a copy of
its Annual Report on Form 10-K, its Quarterly Reports on Form 10-Q, any proxy
statements and any Current Reports on Form 8-K; and (b) within one (1) day after
release, copies of all press releases issued by the Company or any of its
subsidiaries. The Company further agrees to promptly provide to any Purchaser
any information with respect to the Company, its properties, or its business or
Purchaser's investment as such Purchaser may reasonably request; provided,
however, that if any information requested by a Purchaser from the Company
contains material non-public information, the Company shall inform the Purchaser
in writing that the information requested contains material non-public
information and shall in no event provide the material non-public portion of
such information to Purchaser without the express prior written consent of such
Purchaser after being so informed.

         4.8 Intentionally omitted.

         4.9 Intentionally omitted.

         4.10 Prospectus Delivery Requirement. Each Purchaser understands that
the Securities Act may require delivery of a prospectus relating to the Class A
Common Stock in connection with any sale thereof pursuant to a registration
statement under the Securities Act covering the resale by such Purchaser of the
Class A Common Stock being sold.

         4.11 Intentional Acts or Omissions. The Company shall not intentionally
perform any act which if performed, or intentionally omit to perform any act
which, if omitted to be performed, would prevent or excuse the performance of
this Agreement or any of the transactions contemplated hereby or the benefits
intended to be secured thereby by the Purchasers (including, without limitation,
pursuant to any agreements or documents obtained by the Company as a condition
to any Closing hereunder).

         4.12 Corporate Existence. So long as any Purchaser beneficially owns
any Convertible Securities or Warrants, the Company shall maintain its corporate
existence, except in the event of a merger, consolidation or sale of all or
substantially all of the Company's assets, as long as the surviving or successor
entity in such transaction (i) assumes the Company's obligations hereunder and
under the agreements and instruments entered into in connection herewith
regardless of whether or not the Company would have had a sufficient number of
shares of Class A Common Stock authorized and available for issuance in order to
effect the conversion of all Convertible Securities outstanding as of the date
of such transaction and (ii) is a publicly traded corporation whose Common Stock
is listed for trading on The Nasdaq National Market or the New York Stock
Exchange.

         4.13 Share Authorization. The Company covenants and agrees that it
shall (i) solicit by proxy the authorization and approval (the "Shareholder
Approval") of the Rule 4460(i) Authorization by the stockholders of the Company
and (ii) use its best efforts to obtain the Shareholder Approval at its next
annual stockholder meeting, which shall not be held later than September 20,
1999.

         4.14 Intentionally omitted.

         4.15 Reserved Amount. On the date of the Closing and thereafter, the
Company shall have authorized and reserved and keep available for issuance not
less than 8,500,000 (subject to equitable adjustment for any stock splits, stock
dividends, reclassification or similar events and subject to reduction for the
number of any shares of Class A Common Stock issued upon conversion of the
Convertible Securities and upon the exercise of the Warrants) shares of Class A
Common Stock (the " Reserved Amount") solely for the purpose of effecting the
conversion of the Convertible Securities and the exercise of the Warrants. The
Company shall at all times reserve and keep available out of its authorized but
unissued shares of Class A Common Stock a sufficient number of shares of Class A
Common Stock to provide for the full conversion of all Convertible Securities
and the issuance of the shares of Class A Common Stock in connection therewith
and the full exercise of the Warrants and the issuance of the shares of Class A
Common Stock in connection therewith, in each of the foregoing cases without
regard to any limitation on conversion or exercise. The Reserved Amount shall be
allocated ratably among the Purchasers in accordance with the principal amount
of Convertible Securities and Warrants held by them from time to time. If the
Reserved Amount for any three (3) consecutive trading days (the last of such
three (3) trading days being the "Authorization Trigger Date") shall be less
than 175% of the number of shares of Class A Common Stock issuable upon
conversion of Convertible Securities and 100% of the number of shares then
issuable upon exercise of the Warrants on such trading days, the Company shall
immediately notify each Purchaser of such occurrence and shall take action as
soon as possible, but in any event within sixty (60) days after an Authorization
Trigger Date (including, if necessary, shareholder approval to authorize the
issuance of additional shares of Class A Common Stock), to increase the Reserved
Amount to two hundred percent (200%) of the number of shares of Class A Common
Stock then issuable upon conversion of the Convertible Securities and 100% of
the number of shares then issuable upon exercise of the Warrants in each of the
foregoing cases without regard to any limitation on conversion or exercise.

         4.16 Additional Amounts. All payments made by the Company under or with
respect to the Convertible Securities will be made free and clear of, and
without withholding or deduction for or on account of, any present or future
tax, duty, levy, impost, assessment or other governmental charge imposed or
levied by or on behalf of any government or any political subdivision or taxing
authority or agency thereof or therein (hereinafter "Taxes") unless the Company
is required to withhold or deduct Taxes by law or by the interpretation or
administration thereof. If the Company is so required to withhold or deduct any
amount for or on account of Taxes from any payment made under or with respect to
the Convertible Securities, the Company will pay such additional amounts
("Additional Amounts") as may be necessary so that the net amount received by
each holder of Convertible Securities (including Additional Amounts) after such
withholding or deduction will not be less than the amount such holder would have
received if such Taxes had not been required to be withheld or deducted. The
Company will furnish to each holder on its request certified copies of tax
receipts evidencing the payment of any Taxes by the Company, in such form as
provided in the normal course by the taxing authority imposing such Taxes and as
are reasonably available to the Company, within 30 days after the later of the
date of receipt of such evidence and the date of receipt of such request. At
least 30 days prior to each date on which any payment under or with respect to
the Convertible Securities is due and payable, if the Company will be obligated
to pay Additional Amounts with respect to such payment (unless such obligation
to pay Additional Amounts arises after the thirtieth (30th) day prior to the
date on which payment under or with respect to the Convertible Securities is due
and payable, in which case it shall be as promptly as possible thereafter), the
Company will deliver to all holders of Convertible Securities a certificate
stating the fact that such Additional Amounts will be payable and the amounts so
payable. Whenever there is mentioned, in any context, the payment of principal,
interest, if any, or any other amount payable under or with respect to any
Convertible Securities, such mention shall be deemed to refer as well to the
payment of Additional Amounts to the extent that, in such context, Additional
Amounts are, were or would be payable.

         4.17 Waiver of Usury Defense. To the extent permitted by applicable
law, the Company agrees that it will not assert, plead (as a defense or
otherwise) or in any manner whatsoever claim (and will actively resist any
attempt to compel it to assert, plead or claim) in any action, suit or
proceeding that the effective interest rate on the Convertible Securities
violates present or future usury or other laws relating to the interest payable
on any indebtedness and will not otherwise avail itself (and will actively
resist any attempt to compel it to avail itself) of the benefits or advantages
of any such laws.

         4.18 Permanent Financing. The Company agrees to use its best efforts to
obtain financing sufficient to provide for the payment or prepayment in full of
the Convertible Securities, and to effect such payment or prepayment on or
before the Maturity Date (as defined in the Debenture).

         4.19 Further Restriction on Issuance of Securities. Except with respect
to a transaction that is a Major Transaction (as defined in each of the
Debenture and the Warrant and as to which the provisions of Section 8.3 of the
Debenture and Section 4(e) of the Warrant shall apply), except for issuances (i)
in the ordinary course of business pursuant to employee stock option and
employee stock purchase plans in effect on the date hereof and (ii) up to eight
and two tenths percent (8.2%) of Conference Plus, Inc. a subsidiary of the
Company, to a strategic investor (provided that in each case of (i) and (ii) the
Company shall at all times continue to own at least eighty percent (80%) of such
subsidiary), while any Purchaser holds at least $2,500,000 principal amount of
Debentures, the Company and each of its subsidiaries, without the consent of
such Purchaser (it being understood and agreed that a determination with respect
to such consent shall not be unreasonably delayed and any failure to consent
shall be accompanied by a written description in reasonable detail setting forth
the reason for so not consenting), shall not, directly or indirectly, issue or
authorize for issuance, or enter into any commitment to issue, sell, transfer,
distribute or otherwise dispose of any equity security of any of, or with
respect to, the Company's subsidiaries, in each case, in any manner that would
adversely affect in a material manner the interests of such Purchaser in the
Securities.

                                    ARTICLE V
                   LEGEND REMOVAL, TRANSFER, AND CERTAIN SALES

         5.1 Removal of Legend. The Legend shall be removed and the Company
shall issue a certificate without any legend to the holder of any Security upon
which such Legend is stamped, and a certificate for a Security shall be
originally issued without the Legend if (a) the sale of such Security is
registered under the Securities Act, (b) such holder provides the Company with
an opinion of counsel, in form, substance and scope customary for opinions of
counsel in comparable transactions (the reasonable cost of which shall be borne
by the Company) to the effect that a public sale or transfer of such Security
may be made without registration under the Securities Act, (c) such Security can
be sold pursuant to Rule 144 and a registered broker dealer provides to the
Company's transfer agent and counsel copies of (i) a "will sell" letter
satisfying the guidelines established by the SEC and its staff from time to time
and (ii) a customary seller's representation letter with respect to such a sale
to be made pursuant to Rule 144 and (iii) a Form 144 in respect of such Security
executed by such holder and filed (or mailed for filing) with the SEC or (d)
such Security can be sold pursuant to Rule 144(k). Each Purchaser agrees to sell
all Securities, including those represented by a certificate(s) from which the
Legend has been removed, or which were originally issued without the Legend,
pursuant to an effective registration statement and to deliver a prospectus in
connection with such sale or in compliance with an exemption from the
registration requirements of the Securities Act. In the event the Legend is
removed from any Security or any Security is issued without the Legend and
thereafter the effectiveness of a registration statement covering the resale of
such Security is suspended or a supplement or amendment thereto is required by
applicable securities laws, then upon reasonable advance notice to Purchaser
holding such Security, the Company may require that the Legend be placed on any
such Security that cannot then be sold pursuant to an effective registration
statement or Rule 144 or with respect to which the opinion referred to in clause
(b) next above has not been rendered, which Legend shall be removed when such
Security may be sold pursuant to an effective registration statement or Rule 144
or such holder provides the opinion with respect thereto described in clause (b)
next above. In the event that a Purchaser privately transfers or otherwise
privately disposes of any Security which does not contain a Legend and as to
which following such transfer or other disposition the transferee is not
entitled to sell such Security freely or pursuant to Rule 144 and the re-sale of
such Security by such transferee is not immediately thereafter registered under
the Securities Act, then, in connection with such transfer or other disposition
Purchaser and such transferee shall submit such Security for re-legending
applicable to such Security as held by such transferee.

         5.2 Transfer Agent Instructions. The Company shall instruct its
transfer agent to issue certificates, registered in the name of each Purchaser
or its nominee, for the Conversion Shares or Warrant Shares in such amounts as
specified from time to time by such Purchaser to the Company upon, and in
accordance with, the conversion of the Convertible Securities and the exercise
of the Warrants. Such certificates shall bear a legend only in the form of the
Legend and only to the extent permitted by Section 5.1 above. The Company
warrants that no instruction other than such instructions referred to in this
Article V, and no stop transfer instructions other than stop transfer
instructions to give effect to Section 2.6 hereof in the case of the Conversion
Shares or Warrant Shares prior to registration under the Securities Act, will be
given by the Company to its transfer agent and that the Securities shall
otherwise be freely transferable on the books and records of the Company.
Nothing in this Section shall affect in any way a Purchaser's obligations and
agreement set forth in Section 5.1 hereof to resell the Securities pursuant to
an effective registration statement and to deliver a prospectus in connection
with such sale or in compliance with an exemption from the registration
requirements of applicable securities laws. Without limiting any other rights of
Purchasers or obligations of the Company, if (a) a Purchaser provides the
Company with an opinion of counsel, which opinion of counsel shall be in form,
substance and scope customary for opinions of counsel in comparable transactions
(the reasonable cost of which shall be borne by the Company), to the effect that
the Securities to be sold or transferred may be sold or transferred pursuant to
an exemption from registration or (b) a Purchaser transfers Securities pursuant
to Rule 144, the Company shall permit the transfer, and, in the case of the
Conversion Shares and Warrant Shares, promptly instruct its transfer agent to
issue one or more certificates in such name and in such denomination as
specified by such Purchaser in order to effect such a transfer or sale. The
Company acknowledges that a breach by it of its obligations hereunder will cause
irreparable harm to a Purchaser by vitiating the intent and purpose of the
transaction contemplated hereby. Accordingly, the Company acknowledges that the
remedy at law for a breach of its obligations under this Article V will be
inadequate and agrees, in the event of a breach or threatened breach by the
Company of the provisions of this Article V, that a Purchaser shall be entitled,
in addition to all other available remedies, to an injunction restraining any
breach and requiring immediate issuance and transfer, without the necessity of
showing economic loss and without any bond or other security being required.

                                   ARTICLE VI
                 CONDITIONS TO THE COMPANY'S OBLIGATION TO SELL

         6.1 Conditions to the Company's Obligation to Sell. The obligation of
the Company hereunder to issue and sell the Purchased Securities to a Purchaser
at the Closing is subject to the satisfaction, as of the date of such Closing
and with respect to such Purchaser, of each of the following conditions thereto,
provided that these conditions are for the Company's sole benefit and may be
waived by the Company at any time in its sole discretion:

                  (i) Such Purchaser shall have executed the signature page to
this Agreement and the Registration Rights Agreement and delivered the same to
the Company.

             (ii) Such Purchaser shall deliver the applicable Purchase Price for
the Convertible Securities and Warrants purchased at such Closing.

             (iii) The representations and warranties of such Purchaser shall be
true and correct as of the date when made and as of such Closing as though made
at that time, and such Purchaser shall have performed, satisfied and complied in
all material respects with the covenants and agreements required by this
Agreement to be performed or complied with by such Purchaser at or prior to such
Closing. (iv) No statute, rule, regulation, executive order, decree, ruling or
injunction shall have been enacted, entered, promulgated or endorsed by any
court or governmental authority of competent jurisdiction or any self-regulatory
organization having authority over the matters contemplated hereby which
restricts or prohibits the consummation of any of the transactions contemplated
by this Agreement.

                                   ARTICLE VII
              CONDITIONS TO EACH PURCHASER'S OBLIGATION TO PURCHASE

         7.1 Conditions to the Closing. The obligation of each Purchaser
hereunder to purchase the Convertible Securities and Warrants to be purchased by
it on the date of the Closing is subject to the satisfaction of each of the
following conditions, provided that these conditions are for each Purchaser's
sole benefit and may be waived by such Purchaser (with respect to it) at any
time in such Purchaser's sole discretion:

                  (i) The Company shall have executed the signature page to this
Agreement, the Warrant and the Registration Rights Agreement and delivered the
same to Purchaser.

                  (ii) The Company shall have delivered duly executed Debentures
(in such denominations as Purchaser shall request) being so purchased by
Purchaser at the Closing.

                  (iii) The Class A Common Stock, including 7,251,887 shares for
issuance as Conversion Shares and the Warrant Shares, shall be listed on The
Nasdaq National Market or the New York Stock Exchange, subject to issuance, and
trading in the Class A Common Stock shall not have been suspended by The Nasdaq
National Market or the New York Stock Exchange, the SEC or other regulatory
authority and no de-listing or suspension shall be reasonably likely in the
judgment of Purchaser for the foreseeable future.

                  (iv) The representations and warranties of the Company shall
be true and correct as of the date when made and as of the Closing as though
made at that time and the Company shall have performed, satisfied and complied
with the covenants and agreements required by this Agreement to be performed or
complied with by the Company at or prior to the Closing. Purchaser shall have
received a certificate, executed by the Chief Executive Officer or Chief
Financial Officer of the Company, dated as of the Closing to the foregoing
effect and as to such other matters as may be reasonably requested by Purchaser.

                  (v) No statute, rule, regulation, executive order, decree,
ruling or injunction shall have been enacted, entered, promulgated or endorsed
by any court or governmental authority of competent jurisdiction or any
self-regulatory organization having authority over the matters contemplated
hereby which prohibits the consummation of any of the transactions contemplated
by this Agreement.

                  (vi) Purchaser shall have received the officer's certificate
described in Section 3.3, dated as of the Closing.

                  (vii) Purchaser shall have received the opinion of the
Company's counsel, dated as of the Closing, in the form attached hereto as
Exhibit D.

                  (viii) The Company's transfer agent has agreed to act in
accordance with irrevocable instructions in the form attached hereto as Exhibit
E.

                  (ix) Purchaser shall have received the Solvency Certificate in
the form of Exhibit F.

                  (x) The Company shall have received and delivered to Purchaser
an amendment under its Loan and Security Agreement dated as of October 13, 1998
by and among LaSalle National Bank ("LaSalle"), Westell Technologies, Inc.,
Westell, Inc., Westell International, Inc., and Conference Plus, Inc., in the
form attached as Exhibit H and, since the date of this Agreement, no other
changes to that loan agreement have been made except as contemplated by clause
(3) of (xvi) below.

                  (xi) The Company shall have delivered to each Purchaser a
letter in the form of Exhibit G hereto providing a right of first refusal to
such Purchaser with respect to future issuances of securities by the Company.

                  (xii) No event has occurred which constitutes an Event of
Failure (as defined in the Debenture) or an Event of Default (as defined in the
Loan Agreement), or which would constitute an Event of Failure or an Event of
Default with notice or the passage of time or both which have not been cured or
waived to the satisfaction of Purchaser.

                  (xiii) [Intentionally Deleted].

                  (xiv) The Company has entered into a Security Agreement with
each Purchaser in the form attached hereto as Exhibit I.

                  (xv) [Intentionally Deleted].

                  (xvi) LaSalle shall have entered into a Subordination
Agreement with Purchasers (the "Subordination Agreement") which shall (v)
provide for a "standstill" period of not longer than thirty (30) days following
an Event of Failure during which any Purchaser shall be required to refrain from
foreclosing on any collateral of the Company securing the Debentures (the
"Standstill Period"), (w) permit payments to be made pursuant to Section 7.5 of
the Debentures (for a period not to exceed thirty (30) days) in an amount equal
to 1% per day of the aggregate principal amount on the Debentures to the extent
that such payments will not result in any breach of the covenants contained in
Section 6.1(b) of the Loan Agreement as in effect on the date hereof (measured
as if such payments had been made at the end of the immediately preceding
financial period reported to LaSalle), (x) permit payments of interest and
payments of outstanding principal and interest upon maturity of the Debentures
and permit payments of outstanding principal and interest upon maturity of the
Cap Debentures, (y) permit payment of interest under the Debentures (including
interest payments pursuant to Section 10.2 of the Debenture), Conversion Default
Payments (as defined in the Debentures) pursuant to Section 6.1 of the
Debentures, any required payments pursuant to Section 6.2 of the Debentures, any
required payments pursuant to Section 8.9 of the Debentures, any required
payments pursuant to Section 8.3 of the Debentures, any required payments
pursuant to Section 1(e) of the Warrants, any required payments pursuant to
Section 4(e) of the Warrants and required payments pursuant to Section 2.3 of
the Registration Rights Agreement (all of the foregoing payments described in
the foregoing clauses (w), (x) and (y) being referred to herein as "Permitted
Payments"), in each case (1) prior to the declaration of an Event of Failure and
the expiration of the Standstill Period, (2) to the extent that there has not
occurred an Event of Default under the Loan Agreement (taking into account
clause (z) below) and (3) to the extent such payments will not result in any
breach of the covenants contained in Section 6.1(b) of the Loan Agreement as in
effect on the date hereof (measured as if such payments had been made at the end
of the immediately preceding financial period reported to LaSalle) and (z)
contain an Agreement by LaSalle that events giving rise to Permitted Payments
shall not of themselves constitute Events of Default under the Loan Agreement
unless and until any such event results in a Demand Redemption Notice having
been delivered under the Debenture.

                                  ARTICLE VIII
                              ADDITIONAL COVENANTS

         8.1 Effect. The provisions of this Article VIII will remain in effect
as long as any Convertible Securities remain outstanding, except that the
covenants contained in Sections 8.13, 8.15, 8.17, 8.20 and 8.25 shall not apply
during such time as (i) less than five million dollars ($5,000,000) principal
amount of Debentures are outstanding and (ii) no Cap Debentures are outstanding.


         8.2 Definitions. For purposes of this Article VIII, the following terms
shall have the indicated meaning:

                  "Affiliate" means (i) any shareholder of the Company or any of
its subsidiaries, (ii) any corporation or any other person or entity that
directly or indirectly, through one or more intermediaries, controls or is
controlled by or is under common control with the Company or any of its
subsidiaries or (iii) any officer, director, trustee, partner or shareholder of
any corporation or any other person or entity that directly or indirectly,
through one or more intermediaries, controls or is controlled by or is under
common control with the Company or any of its subsidiaries.

                  "Employee Plan" includes any pension, retirement, disability,
medical, dental or other health plan, life insurance or other death benefit
plan, profit sharing, deferred compensation, stock option, bonus or other
incentive plan, vacation benefit plan, severance plan, or other employee benefit
plan or arrangement, including, without limitation, those pension,
profit-sharing and retirement plans of the Company and each of its subsidiaries
and any pension plan, welfare plan, Defined Benefit Pension Plans (as defined in
the Employee Retirement Income Security Act of 1974, as amended from time to
time ("ERISA")) or any multi-employer plan, maintained or administered by the
Company and each of its subsidiaries to which the Company or any of its
subsidiaries is a party or may have any liability or by which the Company or any
of its subsidiaries is bound.

                  "Environmental Laws" means all federal, state and local Laws
(including, without limitation, the common law), statutes, ordinances, rules,
regulations and other requirements (including, without limitation,
administrative orders, consent agreements and conditions contained in the
applicable permits), relating to health, safety and the protection of the
environment, including, without limitation, the Comprehensive Environmental
Response, Compensation and Liability Act ("CERCLA"), 42 U.S.C. ss. 9601 et seq.,
the Resource Conservation and Recovery Act ("RCRA"), 42 U.S.C. ss. 6901 et seq.,
and the Clean Air Act 42. U.S.C. ss. 7401 et seq., as amended or hereafter
amended.

         8.3 Intentionally omitted.

         8.4 Financial Information and Reporting. The Company shall cause to be
furnished to the Purchasers: 

                  (i) As soon as practicable and, in any event, within ninety
         (90) days after the end of each of the Company's fiscal years,
         beginning with the fiscal year ended March 31, 1999, a written
         statement of such Company's independent certificated public accountant
         (i) that in performing the audit such accountant has not obtained
         knowledge of any Event of Default or any Event of Failure, or
         disclosing all Events of Default or Events of Failure of which it has
         obtained knowledge and (ii) that such accountant is aware that the
         Purchasers are relying on such accountant's certification, together
         with a copy of the Company's 10-K, as filed with the SEC;

                  (ii) Without limitation, but without duplication of,
         obligations under 8.22 and 8.23, together with the delivery of the
         Company's 10-Q and 10-K required to be delivered under this Agreement,
         a certificate of the Company executed by an authorized officer of the
         Company stating whether any Event of Default or Event of Failure, or
         any event which, with the passage of time or giving of notice or both,
         would constitute such an Event of Default or Event of Failure,
         currently exists and is continuing and what action, if any, the Company
         and/or any of its subsidiaries is taking or propose to take with
         respect thereto;

                  (iii) Without limitation, but without duplication of,
         obligations under 8.22 and 8.23, promptly after the occurrence thereof,
         notice, in writing, of any Event of Default or Event of Failure, or any
         event which, with the passage of time or giving of notice or both,
         would constitute such an Event of Default or Event of Failure and what
         action, if any, the Company and/or any of its subsidiaries are taking
         or propose to take with respect thereto; and

                  (iv) Promptly after the occurrence thereof, a Material Adverse
         Effect.

         8.5 Intentionally omitted.

         8.6 Corporate Existence. The Company and each of its subsidiaries shall
maintain and preserve their corporate existence, good standing, certificates of
authority, licenses, permits, franchises, patents, trademarks, trade names,
service marks, copyrights, leases and all other contracts and rights necessary
or desirable to continue their operations and business as now conducted and will
generally continue the substantially same lines of business as those being
presently conducted and related businesses in the telecommunications area which
would not have a Material Adverse Effect.

         8.7 Taxes and Laws. The Company and each of its subsidiaries will pay
when due all taxes, including excise taxes and duty, assessments, charges and
levies imposed on the Company and each of its subsidiaries or any of their
income, profits, property or assets, or which they are required to withhold and
pay out, and will comply with all applicable present and future laws unless the
Company or any of its affiliates is contesting in good faith, by an appropriate
proceeding, the validity, amount or imposition of the above, subject to
appropriate reserves, and such contest does not have or cause a Material Adverse
Effect or impair the Company or any of its affiliates ability to perform any of
its material obligations.

         8.8 Repair and Maintenance. The Company and each of its subsidiaries
will maintain all of their assets and properties in good condition and repair
and in proper working order, normal wear and tear excepted as the Company deems
necessary for the conduct of its business.

         8.9 Intentionally omitted.

         8.10 Employee Plans. The Company and each of its subsidiaries shall (i)
keep in full force and effect any and all Employee Plans which are presently in
existence or may, from time to time, come into existence under ERISA, and not
withdraw from or terminate any such Employee Plans, unless such withdrawal or
termination can be effected or such Employee Plans can be terminated without
material liability to the Company and each of its subsidiaries; (ii) make
contributions to all of such Employee Plans in a timely manner and in a
sufficient amount to comply with the requirements of ERISA, including the
minimum funding standards of Section 302 of ERISA; (iii) comply with all
material requirements of ERISA which relate to such Employee Plans; (iv) notify
the Purchasers immediately upon receipt by the Company or any of its
subsidiaries of any notice concerning the imposition of any withdrawal liability
or of the institution of any proceeding or other action which may result in the
termination of any such Employee Plans or the appointment of a trustee to
administer such Employee Plans; and (v) promptly advise the Purchasers of the
occurrence of any Reportable Event or Prohibited Transaction that is not exempt
by statute, as defined in ERISA, with respect to any such Employee Plans.

         8.11 Intentionally deleted.

         8.12 Environmental Matters - Indemnification. The Company and each of
its subsidiaries shall take or cause to be taken all actions to comply in all
material respects with the requirements of all Environmental Laws including,
without limitation, all filing and reporting requirements thereof. The Company
hereby agree to indemnify, hold harmless and reimburse the Purchaser for any and
all loss, damage, expenses or costs of any kind or nature arising out of or
incurred in connection with any prior, existing or future violations by the
Company and each of its subsidiaries of any Environmental Laws.

         8.13 Transfer of Assets. The Company and each of its subsidiaries shall
not sell, lease, transfer or otherwise dispose of any of their assets,
properties or rights, except in the ordinary course of business consistent with
past practice except as permitted by the holders of Permitted Senior
Indebtedness.

         8.14 Intentionally deleted.

         8.15 Prepayment or Modification of Indebtedness. Except for Permitted
Senior Indebtedness (as defined below) the Company and each of its subsidiaries
will not incur any additional indebtedness, including for purposes of this
Section 8.15 any capitalized leases. Except for Permitted Senior Indebtedness,
the Company and each of its subsidiaries will not (i) prepay any indebtedness
for money borrowed or any indebtedness secured by any of their assets and (ii)
enter into or modify any agreement as a result of which the terms of payment of
any of the foregoing indebtedness are amended or modified in a manner which
would accelerate its payment. "Permitted Senior Indebtedness" shall mean (i) the
obligations of the Company pursuant to that certain Loan and Security Agreement
dated as of October 13, 1998 by and among LaSalle National Bank, the Company,
Westell, Inc., Westell International, Inc., and Conference Plus, Inc., in its
form as of the date of the Closing as amended and in effect (the "Loan
Agreement") and any extensions, amendments and replacements of the Loan
Agreement (x) which do not increase the amount outstanding, other than increases
resulting from an increase in the Company's inventory or receivables borrowing
base (provided that the advance rates with respect to such inventory and
receivables are no more favorable to the Company than contained in the Loan
Agreement as of the date of this Agreement) and (y) which do not otherwise
materially increase amounts required to be paid under the Loan Agreement as of
the date of this Agreement, and which, in any event, (other than by virtue of
indebtedness permitted by the foregoing clause (x)) do not affect the Purchasers
or the Purchasers' interests in the Securities in any manner materially more
adverse to the Purchasers than the Loan Agreement in its form as of the date of
the Closing, (ii) capitalized leases of the Company in existence as of the date
hereof or for Permitted Capital Expenditures (as defined in Section 8.20), (iii)
existing purchase money financing and purchase money financing for Permitted
Capital Expenditures and (iv) Permitted Acquisition Financing (as defined
below); provided, however that the Company shall not incur any Permitted
Acquisition Financing (x) during the period beginning on the date hereof and
ending one hundred and eighty (180) days after the Closing, unless the Company
shall have effectively waived the restrictions on conversion of the Debentures
during such period contained in Section 3.7(c) of the Debentures and shall not
have issued, and shall have waived its right to thereafter issue, Cap
Debentures, (y) during the continuance of any Event of Failure or any event
which, with notice or the passage of time or the continuance of such event,
would constitute an Event of Failure or (z) at any time that the Conversion
Shares cannot then be effectively sold pursuant to an effective registration
statement filed with the SEC pursuant to the Registration Rights Agreement. For
purposes of this Section 8.15: the term "Permitted Acquisition Financing" means
(a) Pari Passu Indebtedness (defined below) which meets the Acquisition
Financing Criteria and which does not provide for maturity, under any
circumstances, until following the maturity of the Debentures and (b)
indebtedness that (i) is senior to the indebtedness evidenced by the Debentures,
(ii) is issued to finance the acquisition of a conferencing services business
which, on a pro forma basis after giving effect to the incurrence of such
indebtedness, will provide the Company with an additional $100,000 per year in
cash flow (a "CSB Acquisition"), and (iii) meets the Acquisition Financing
Criteria; the "Acquisition Financing Criteria" with respect to indebtedness
incurred to finance the acquisition by the Company of any business shall be
satisfied if (i) on a pro forma historical basis (with respect to an acquisition
that is not a CSB Acquisition), for the most recent 12-month period ended prior
to the consummation of such acquisition, the Company's gross margin would have
been greater than the actual gross margin of the Company for such prior 12-month
period, (ii) on a pro forma projected basis, for the 12 month period commencing
as of the consummation of such acquisition, the Company's (x) gross margin (with
respect to an acquisition that is a CSB Acquisition) and earning per share would
each be greater than the projected gross margin or earnings per share (with
respect to any acquisition), as the case may be, of the Company for such future
12-month period in the absence of such acquisition and (y) operating expenses as
a percentage of gross revenues would be less than projected operating expenses
as a percentage of gross revenues for such future 12-month period in the absence
of such acquisition, and (iii) such indebtedness does not cause the Company's
debt to equity ratio to exceed 1:2, including as equity for these purposes any
outstanding Debentures, in each case, with respect to the foregoing clauses (i)
through (iii), as determined by the Board of Directors of the Company in good
faith. Upon any replacement of LaSalle National Bank as senior lender,
Purchasers agree to execute and deliver a subordination agreement with such
replacement senior lender in substantially the same form as the Subordination
Agreement. "Pari Passu Indebtedness" means indebtedness which shares equal
priority as to payment and lien with the Purchasers' rights to payment and lien
under the Debentures and the Security Agreement, pro rata, in the proportion
that the principal amount outstanding of each of the Debentures and such pari
passu indebtedness bears to the sum of the outstanding principal amount of the
Debentures plus the outstanding principal amount of such indebtedness and
Purchasers agree to execute and deliver any required documents which evidence
the pari passu status of such liens.

         8.16 Transactions with Affiliates. The Company and each of its
subsidiaries will not enter into any agreement or arrangement, written or oral,
directly or indirectly, with an Affiliate, or provide services or sell goods to,
or for the benefit of, or pay or otherwise distribute monies, goods or other
valuable consideration to, an Affiliate, except upon fair and reasonable terms
no less favorable to the Company and each of its subsidiaries than terms in a
comparable arm's length transaction with an unaffiliated person or entity and
except for intercompany debt.

         8.17 Guarantees. The Company and each of its subsidiaries shall not
guarantee, assume, endorse or otherwise, in any way, become directly or
contingently liable in any manner with respect to the obligations or liabilities
of any other person or entity, except by endorsement of instruments or items for
payment or deposit or collection and except for guarantees by the Company of
indebtedness or other obligations of its subsidiaries permitted by Section 8.15
or other obligations of its subsidiaries guaranteed in the ordinary course of
business consistent with past practice and which do not otherwise constitute a
violation of the obligations of the Company or its subsidiaries under this
Agreement or the Debentures or the Cap Debentures.

         8.18 Intentionally deleted.

         8.19 Intentionally deleted.

         8.20 Capital Expenditures. The Company and each of its subsidiaries
shall not make or incur or commit to incur aggregate capital expenditures in any
fiscal year in excess of ten percent (10%) of the Company's revenues for its
immediately preceding fiscal year ("Permitted Capital Expenditures").

         8.21 Limitation of Agreements. Except for the Subordination Agreement,
the Company will not, and will not permit any Subsidiary to, enter into any
Contract, or any amendment, modification, extension or supplement to any
existing Contract, which contractually prohibits the Company from paying
interest on, or principal of, the Debentures or effecting the conversion of the
Debentures.

         8.22 Compliance Certification. At the end of each quarter of the
Company's fiscal year, the Company shall deliver to each Purchaser a certificate
of an authorized financial officer of the Company regarding compliance by the
Company with the covenants set forth herein and certifying that no default under
this Agreement, default or Event of Default under the Loan Agreement, or default
or Event of Failure under the Debentures shall have occurred and be continuing.

         8.23 Notice of Breach. As promptly as practicable, and in any event not
later than five business days after senior management of the Company becomes
aware thereof, the Company shall provide each Purchaser with written notice of
any breach by the Company of any provision of this Agreement, the Senior
Indebtedness or the Debentures, including, without limitation, this Article
VIII, specifying the nature of such breach and any actions proposed to be taken
by the Company to cure such breach.

         8.24 Intentionally deleted.

         8.25 Liens. The Company shall not create or suffer to exist any Lien
upon any of its property now owned or hereafter acquired, or acquire any
property upon any conditional sale or other title retention device or
arrangement or any purchase money security agreement, other than Permitted Liens
and Liens to secure Permitted Senior Indebtedness. As used in this Agreement:
(a) "Lien" means any mortgage, lien, title claim, assignment, encumbrance,
security interest, adverse claim, contract of sale, restriction on use or
transfer or other defect of title of any kind; and (b) "Permitted Liens" means
(i) statutory Liens for Taxes not yet due; (ii) Liens of carriers, warehousemen,
mechanics and materialmen incurred in the ordinary course of business for sums
not yet due; (iii) Liens incurred or deposits made in the ordinary course of
business in connection with workers' compensation, unemployment insurance and
other types of social security; and (iv) Liens securing Permitted Senior
Indebtedness.

                                   ARTICLE IX
                          GOVERNING LAW; MISCELLANEOUS

         9.1 Governing Law; Jurisdiction. This Agreement shall be governed by
and construed in accordance with the laws of the State of New York applicable to
contracts made and to be performed in the State of New York. The parties hereto
irrevocably consent to the jurisdiction of the United States federal courts
located in the State of New York. The parties hereto irrevocably consent to the
jurisdiction of the United States federal courts located in the state of New
York and the state courts located in the County of New York in the State of New
York in any suit or proceeding based on or arising under this Agreement or the
transactions contemplated hereby and irrevocably agree that all claims in
respect of such suit or proceeding may be determined in such courts. The Company
irrevocably waives the defense of an inconvenient forum to the maintenance of
such suit or proceeding. The Company further agrees that service of process upon
the Company mailed by the first class mail shall be deemed in every respect
effective service of process upon the Company in any suit or proceeding arising
hereunder. Nothing herein shall affect Purchaser's right to serve process in any
other manner permitted by law. The parties hereto agree that a final
non-appealable judgment in any such suit or proceeding shall be conclusive and
may be enforced in other jurisdictions by suit on such judgment or in any other
lawful manner.

         9.2 Counterparts. This Agreement may be executed in two or more
counterparts, including, without limitation, by facsimile transmission, all of
which counterparts shall be considered one and the same agreement and shall
become effective when counterparts have been signed by each party and delivered
to the other party. In the event any signature page is delivered by facsimile
transmission, the party using such means of delivery shall cause additional
original executed signature pages to be promptly delivered to the other parties.

         9.3 Headings. The headings of this Agreement are for convenience of
reference and shall not form part of, or affect the interpretation of, this
Agreement.

         9.4 Severability. If any provision of this Agreement shall be invalid
or unenforceable in any jurisdiction, such invalidity or unenforceability shall
not affect the validity or enforceability of the remainder of this Agreement or
the validity or enforceability of this Agreement in any other jurisdiction.

         9.5 Scope of Agreement; Amendments. This Agreement and the documents
and instruments referenced herein contain the entire understanding of the
parties with respect to the matters covered herein and therein and, except as
specifically set forth herein, no Purchaser makes any representation, warranty,
covenant or undertaking with respect to the transactions contemplated hereby. No
provision of this Agreement may be waived other than by an instrument in writing
signed by the party to be charged with enforcement and no provision of this
Agreement may be amended other than by an instrument in writing signed by the
Company and each Purchaser.

         9.6 Notice. Any notice herein required or permitted to be given shall
be in writing and may be personally served or delivered by courier or by
facsimile-machine confirmed telecopy, and shall be deemed delivered at the time
and date of receipt (which shall include telephone line facsimile transmission).
The addresses for such communications shall be:

                           If to the Company:

                           Westell Technologies, Inc.
                           750 N. Commons Drive
                           Aurora, IL 60504
                            Telecopy: (630) 375-4940
                          Attention: Stephen J. Hawrysz

                           with a copy to:

                           Neal J. White, P.C.
                           McDermott, Will & Emery
                           227 West Monroe Street
                           Chicago, IL 60606
                           Telecopy:  (312) 984-3669
                           Attention:  (312) 984-7579

If to any Purchaser, to such address set forth under such Purchaser's name on
the signature page hereto executed by such Purchaser. Each party shall provide
notice to the other parties of any change in address.

         9.7 Successors and Assigns. This Agreement shall be binding upon and
inure to the benefit of the parties and their successors and assigns. Neither
the Company nor any Purchaser shall assign this Agreement or any rights or
obligations hereunder without the prior written consent of the other, which, in
the case of any consent required of the Company, shall not be unreasonably
withheld. Notwithstanding the foregoing, each Purchaser may assign its rights
and obligations hereunder and may transfer any or all of its Securities to any
of its "affiliates",as that term is defined under the Exchange Act, without the
consent of the Company so long as such affiliate is an accredited investor. This
provision shall not limit each Purchaser's right to transfer the Securities
pursuant to the terms of this Agreement. In addition, and notwithstanding
anything to the contrary contained in this Agreement, the Convertible
Securities, the Warrants or the Registration Rights Agreement, the Securities
may be pledged, and all rights of Purchaser under this Agreement or any other
agreement or document related to the transaction contemplated hereby may be
assigned, without further consent of the Company, to a bona fide pledgee in
connection with a Purchaser's margin or brokerage accounts.

         9.8 Third Party Beneficiaries. This Agreement is intended for the
benefit of the parties hereto and their respective permitted successors and
assigns and is not for the benefit of, nor may any provision hereof be enforced
by, any other person.

         9.9 Survival. The representations, warranties, agreements and covenants
of the Company in this Agreement shall survive each and every Closing hereunder
notwithstanding any due diligence investigation conducted by or on behalf of
Purchaser. The Company agrees to indemnify and hold harmless each Purchaser and
each of each Purchaser's officers, directors, employees, partners, agents and
affiliates for loss or damage arising as a result of or related to (a) any
breach by the Company of any of its representations or covenants set forth
herein, or (b) any cause of action, suit or claim brought or made against such
indemnitee, other than by the Company solely for breach of this Agreement, the
Warrant, the Debenture or the Registration Rights Agreement by the indemnitee or
by governmental or regulatory authorities, and arising out of or resulting from
the execution, delivery, performance or enforcement of this Agreement or any
other instrument, document or agreement executed pursuant hereto or contemplated
hereby, any transaction financed or to be financed in whole or in part, directly
or indirectly, with the proceeds of the issuance of the Securities or the status
of Purchaser as an investor in the Company, except to the extent that such
actual loss or damage directly results from a breach by such indemnitee of this
Agreement, the Warrant, the Debenture or the Registration Rights Agreement or
from a violation of law. The right to indemnification shall include the right to
advancement of expenses as they are incurred

         9.10 Public Filings; Publicity. Immediately following execution of this
Agreement, the Company shall issue a press release with respect to the
transactions contemplated hereby. The Company and each Purchaser shall have the
right to approve before issuance any press releases (including the foregoing
press release), SEC or other filings, or any other public statements, with
respect to the transactions contemplated hereby; provided, however, that the
Company shall be entitled, without the prior approval of any Purchaser, to make
any press release or SEC, Nasdaq, NASD or exchange filings with respect to such
transactions as is required by applicable law and regulations (although each
Purchaser shall (to the extent time permits) be consulted by the Company in
connection with any such press release prior to its release and shall be
provided with a copy thereof).

         9.11 Further Assurances. Each party shall do and perform, or cause to
be done and performed, all such further acts and things, and shall execute and
deliver all such other agreements, certificates, instruments and documents, as
the other party may reasonably request in order to carry out the intent and
accomplish the purposes of this Agreement and the consummation of the
transactions contemplated hereby.

         9.12 Remedies. No provision of this Agreement providing for any remedy
to a Purchaser shall limit any remedy which would otherwise be available to such
Purchaser at law or in equity. Nothing in this Agreement shall limit any rights
a Purchaser may have with any applicable federal or state securities laws with
respect to the investment contemplated hereby.

         9.13 Directly or Indirectly. Where any provision in this Agreement
refers to action to be taken by any Person, or which such Person is prohibited
from taking, such provision shall be applicable whether the action in question
is taken directly or indirectly by such Person.

         9.14 Termination. In the event that the Closing shall not have occurred
by April 16, 1999, unless the parties agree otherwise, this Agreement shall
terminate; except for any material breach of this Agreement prior to the
termination of this Agreement, no party shall have any liability to any other
party hereunder in the event of such termination.

         IN WITNESS WHEREOF, the undersigned Purchasers and the Company have
caused this Agreement to be duly executed as of the date first above written.

COMPANY:

WESTELL TECHNOLOGIES, INC.

By:                                                           
         Name:                                                
         Title:                                                        

PURCHASER:

CASTLE CREEK TECHNOLOGY PARTNERS LLC

By:      CASTLE CREEK PARTNERS LLC
Its:     Investment Manager

By:                                                                    
    -------------------------------------------------------------------
         Name:             John D. Ziegelman
         Title:            Managing Member
         Address:          77 W. Wacker, Suite 4040
                           Chicago, IL 60601
         Telephone:        (312) 499-6900
         Telecopy:         (312) 499-6999

Jurisdiction: Illinois

Purchase Price $9,000,000

         Debenture Allocation:  $8,856,818
         Warrant Allocation:  $143,182
                  Number of Warrant Shares 409,091





<PAGE>



MARSHALL CAPITAL MANAGEMENT, INC.

By:                                                                    
         Name:                                                         
         Title:                                                                 
         Address:                                                      



         Attention:                                           
         Telephone:                                           
         Telecopy:                                            

Jurisdiction: _____________

Purchase Price $6,000,000

         Debenture Allocation:  $5,904,546
         Warrant Allocation:  $95,454
                  Number of Warrant Shares 272,727








CAPITAL VENTURES INTERNATIONAL
by HEIGHTS CAPITAL MANAGEMENT, as agent

By:                                                                    
         Name:                                                         
         Title:                                                                 
         Address:                                                      



         Attention:                                           
         Telephone:                                           
         Telecopy:                                            

Jurisdiction: _____________

Purchase Price $5,000,000

         Debenture Allocation:  $4,920,454
         Warrant Allocation:  $79,546
                  Number of Warrant Shares 227,273








                          SECURITIES PURCHASE AGREEMENT
                       SCHEDULE OF EXHIBITS AND SCHEDULES

EXHIBIT A         Debenture
EXHIBIT B         Warrants
EXHIBIT C         Registration Rights Agreement
EXHIBIT D         Opinion of Counsel
EXHIBIT E         Irrevocable Instruction
EXHIBIT F         Solvency Certificate
EXHIBIT G         Right of First Refusal Letter
EXHIBIT H         Amendment to Loan Agreement
EXHIBIT I         Security Agreement

SCHEDULE 3.2      Necessary Authorization or Consents
SCHEDULE 3.3      Other Convertible Securities
SCHEDULE 3.6      Registration and SEC Documents
SCHEDULE 3.7      Certain Changes
SCHEDULE 3.8      Litigation
SCHEDULE 3.18     Key Employees
SCHEDULE 4.5      Restrictions on Issuance of Securities










     THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
     UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
     STATE OF THE UNITED STATES. THE SECURITIES REPRESENTED HEREBY MAY NOT BE
     OFFERED OR SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE
     REGISTRATION STATEMENT FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS,
     OR UNLESS OFFERED, SOLD OR TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION
     FROM THE REGISTRATION REQUIREMENTS OF THOSE LAWS. THE INDEBTEDNESS OF THE
     COMPANY EVIDENCED HEREBY IS SUBJECT TO THE RIGHTS OF LASALLE NATIONAL BANK,
     ITS SUCCESSORS AND ASSIGNS, UNDER A SUBORDINATION AGREEMENT DATED APRIL 15,
     1999.


                      6% SUBORDINATED CONVERTIBLE DEBENTURE

     April    , 1999                                                $          

          FOR   VALUE  RECEIVED,   Westell  Technologies,   Inc.,   a  Delaware
     corporation (hereinafter  called the "Borrower" or  the "Company"), hereby
     promises     to      pay     in      cash     to     the      order     of
                                                              or      registered
     assigns or transferees of all or any portion hereof (each a "Holder" and,
     collectively, "Holders") the aggregate sum of million dollars
     ($____________) on April 15, 2004 [fifth anniversary of issuance] (the
     "Scheduled Maturity Date"), and to pay interest, in arrears, on (i) the
     last day of June and December of each year (unless such day is not a
     business day, in which event on the next succeeding business day) (each, an
     "Interest Payment Date"), (ii) the Scheduled Maturity Date, and (iii) the
     date the principal amount of the Debentures shall be declared to be or
     shall automatically become due and payable, on the unpaid principal sum
     hereof outstanding at the rates per annum set forth below, from the most
     recent Interest Payment Date to which interest has been paid on this
     Debenture, or if no interest has been paid on this Debenture, from the day
     after the date of this Debenture (the "Issue Date") until payment in full
     of the principal sum hereof has been made.

          The interest rate shall be the six percent (6%) per annum, but the
     interest rate shall be eight percent (8%) per annum if the Green Floor
     Price (as defined below) is or has ever been the applicable conversion
     price (the "Interest Rate"). Past due amounts (including interest, to the
     extent permitted by law) will also accrue interest at the lesser of (a) the
     Interest Rate plus 5% per annum and (b) the maximum rate permitted by
     applicable law, and will be payable on demand ("Default Interest").
     Interest on this Debenture will be calculated on the basis of a 365-day
     year. All payments under this Debenture made in cash shall be made by wire
     transfer of immediately available funds in currency of the United States of
     America to such account as the Holders shall hereafter give to the Borrower
     by written notice made in accordance with the provisions of this Debenture.

          At the option of the Company, interest may be paid in cash, in
     debentures in the form hereof ("PIK Debentures") or in shares of the
     Company's Class A Common Stock, par value $0.01 per share (the "Class A
     Common Stock" and, together with all other classes and series of the common
     stock of the Company, the "Common Stock"), provided, however, that the
     Company may not pay interest in PIK Debentures or in shares of Class A
     Common Stock unless (a) no Event of Failure (as defined below) (and no
     event which, with notice or passage of time, would constitute an Event of
     Failure) has occurred and is continuing, (b) the shares of Class A Common
     Stock issuable (whether directly or pursuant to the PIK Debentures) have
     been registered for resale in an appropriate and an effective registration
     statement under the Securities Act of 1933, as amended, available for
     immediate use by the Holder and such shares are qualified or exempt under
     applicable state securities laws so that the Holder may immediately
     thereafter resell such shares of Class A Common Stock, (c) the shares of

<PAGE>



     Class A Common Stock issuable (whether directly or pursuant to the PIK
     Debentures) are listed for trading on The Nasdaq National Market and (d)
     such shares of Class A Common Stock are, in the case of the PIK Debentures,
     reserved for issuance in accordance with the Reserved Amount (as defined
     below) requirement of Section 4.1 hereof. If the Company determines to pay
     interest in shares of Class A Common Stock or PIK Debentures, it shall be
     required to notify the Holder of such election at least five (5) business
     days prior to the applicable Interest Payment Date. The principal amount of
     Debentures to be issued as interest shall be equal to the dollar amount of
     interest due at the time of payment. The number of shares of Class A Common
     Stock issued as interest shall be the number determined by dividing the
     dollar amount of interest due by an amount equal to the average of the
     Closing Sale Prices of the Class A Common Stock for the five (5) business
     days prior to the date interest is so paid.

          This 6% Subordinated Convertible Debenture is one of a duly authorized
     issuance of Twenty Million Dollars ($20,000,000) aggregate principal amount
     of Subordinated Convertible Debentures of the Company (each, a "Debenture")
     referred to in the Securities Purchase Agreement dated April 14, 1999 among
     the Company and the initial Holders (the "Securities Purchase Agreement").
     The Securities Purchase Agreement contains certain additional agreements
     among the parties with respect to the terms of this Debenture. All such
     provisions are an integral part of this Debenture and are incorporated
     herein by reference. All terms defined in the Securities Purchase Agreement
     and not otherwise defined herein shall have for purposes hereof the
     meanings provided for therein. This Debenture is transferable and
     assignable to one or more purchasers (in minimum denominations of $500,000
     or larger multiples of $100,000 or lesser remaining outstanding principal
     amounts), in accordance with the limitations set forth in the Securities
     Purchase Agreement.

          The Company agrees, and the Holder by accepting this Debenture agrees,
     that the indebtedness evidenced by this Debenture and the payment of the
     principal thereof and interest thereon and all other amounts owing in
     respect thereof are subordinated in right of payment to the prior payment
     in full in cash of all Permitted Senior Indebtedness of the Company and
     that the subordination is for the benefit of the holders of Permitted
     Senior Indebtedness of the Company, all of the foregoing to the extent
     provided herein. "Permitted Senior Indebtedness" shall have the meaning
     ascribed thereto in the Securities Purchase Agreement under clauses (i) and
     (iv)(b) of the definition thereof.

     If there should occur with respect to the Company any receivership,
     insolvency, assignment for the benefit of creditors, bankruptcy,
     reorganization or arrangements with creditors (whether or not pursuant to
     bankruptcy or other insolvency laws), sale of all or substantially all of
     the assets, dissolution, liquidation or any other marshaling of the assets
     and liabilities of the Company, or if this Debenture shall be declared due
     and payable solely upon the occurrence of an event of default with respect
     to any Permitted Senior Indebtedness, then no amount shall be paid by the
     Company in respect of the principal of or interest on this Debenture at the
     time outstanding, unless and until the principal of and interest on the
     Permitted Senior Indebtedness then outstanding shall be paid in full.

     Subject to the provisions of the Subordination Agreement (as defined in the
     Securities Purchase Agreement) and the rights, if any, of the holders of
     Permitted Senior Indebtedness as herein provided to receive cash,
     securities or other properties otherwise payable or deliverable to the
     Holder of this Debenture, nothing contained herein shall impair, as between
     the Company and the Holder, the obligation of the Company, subject to the
     terms and conditions hereof, to pay to the Holder amounts due hereunder as
     and when the same become due and payable, or shall prevent the Holder of
     this Debenture from exercising all rights, powers and remedies otherwise
     provided herein or by applicable law.

<PAGE>



     Subject to the payment in full of all Permitted Senior Indebtedness and
     until this Debenture shall be paid in full, the Holder shall be subrogated
     to the rights of the holders of Permitted Senior Indebtedness (to the
     extent of payments or distributions previously made by the Holder to such
     holders of Permitted Senior Indebtedness pursuant to the Subordination
     Agreement) to receive payments or distributions of assets of the Company
     applicable to the Permitted Senior Indebtedness. No such payments or
     distributions applicable to the Permitted Senior Indebtedness shall, as
     between the Company and its creditors, other than the holders of Permitted
     Senior Indebtedness and the Holder, be deemed to be a payment by the
     Company to or on account of this Debenture; and for the purposes of such
     subrogation, no payments or distributions to the holders of Permitted
     Senior Indebtedness to which the Holder would be entitled except for the
     foregoing provisions shall, as between the Company and its creditors, other
     than the holders of Permitted Senior Indebtedness and the Holder, be deemed
     to be a payment by the Company to or on account of the Permitted Senior
     Indebtedness.

     Notwithstanding anything to the contrary, Holders may receive (i) shares of
     Series A Common Stock upon conversion of the Debentures, (ii) Cap
     Debentures issued pursuant to the Debentures, and (iii) PIK Debentures
     issued pursuant to the Debentures.

     The obligations of Company under this Debenture, the PIK Debentures and the
     Cap Debentures shall be secured by a security interest and lien on all of
     the Company s assets (including any equity interest in its subsidiaries)
     subject only to the prior security interests and liens granted to the
     holders of Permitted Senior Indebtedness as set forth in a separate
     Security Agreement to be executed by the Company in favor of the Holders of
     such Debentures (the "Security Agreement").

                                    ARTICLE I
                                   REDEMPTION

          1.1 Limited Right to Prepay or Redeem. Except as provided herein, this
     Debenture may not be prepaid or redeemed by the Company without the prior
     written consent of all Holders.

          1.2  Redemption at Borrower's Option.

               (a) At any time after the first (1st) anniversary of the date of
     the Closing, the Borrower shall have the right ("Redemption at Borrower's
     Election") to redeem, subject to the limitations herein contained, all or
     any portion of the then outstanding Debentures for the Optional Redemption
     Amount (as herein defined) which right shall be exercisable at any time
     during the term of this Debenture after the first (1st) anniversary of the
     date of the Closing by delivery of an Optional Redemption Notice in
     accordance with the redemption procedures set forth in this Article I. Any
     Redemption at Borrower's Election pursuant to this Section 1.2 shall be
     made ratably among Holders in proportion to the principal amount of
     Debentures then outstanding. Subject to the limitations on conversion
     contained herein, Holders may convert all or any part of their Debentures
     selected for prepayment hereunder into Common Stock at the Conversion Price
     by delivering a Notice of Conversion to the Borrower at any time prior to
     the Effective Time of Redemption (as herein defined). The "Optional
     Redemption Amount" with respect to each Debenture means one hundred fifteen
     percent (115%) of the face amount of the Debentures to be redeemed plus
     accrued and unpaid interest. In no event shall the Borrower be permitted to
     elect a redemption pursuant to this Article I of a principal amount of
     Debentures which, if all such principal amount of Debentures subject to
     redemption were immediately converted into Common Stock pursuant to the
     terms hereof, would, solely as a result of such conversion and without
     regard to Section 3.7(b) hereof, result in any Holder owning in excess of
     4.9% of the Class A Common Stock (the "4.9% Limitation"). A Redemption at
     Borrower s Election shall be for not less than $2,000,000 aggregate
     principal amount of Debentures or such maximum

<PAGE>



     lesser amount as would not cause the 4.9% Limitation to be exceeded as to
     any holder of Debentures. Furthermore, prior to Shareholder Approval (as
     defined in the Securities Purchase Agreement), unless otherwise permitted
     by The Nasdaq National Market or unless the rules thereof no longer are
     applicable to the Company, in no event shall the Borrower be permitted to
     elect a redemption pursuant to this Article I of a principal amount of
     Debentures which, if all such principal amount of Debentures subject to
     redemption were immediately converted into Common Stock pursuant to the
     terms hereof, would, solely as a result of such conversion and without
     regard to Section 3.7(a) hereof, result in any Holder owning in excess of
     4.9% such Holder allocable portion of the Cap Amount.

               (b) The Borrower may not deliver an Optional Redemption Notice
     (as defined below) to a Holder unless:

                    (i) on or prior to the date of delivery of such Optional
          Redemption Notice, the Borrower shall have deposited with an escrow
          agent reasonably satisfactory to such Holder, as a trust fund, cash
          sufficient in amount to pay all amounts to which Holders are entitled
          upon such prepayment pursuant to Subsection (a) of this Section 1.2,
          with irrevocable instructions and authority to such escrow agent to
          complete the prepayment thereof in accordance with this Section 1.2;
          and

                    (ii) either (I) the weighted average sale price of the
          Common Stock as reported by Bloomberg Financial Markets or a
          comparable reporting service of national reputation selected by the
          Company and reasonably acceptable to each initial holder of the
          Debentures (the "Weighted Average Sale Price") is greater than or
          equal to two hundred percent (200%) of the Variable Conversion Price
          (as defined below) then in effect for the twenty (20) consecutive
          trading days immediately preceding the date of delivery of such
          Optional Redemption Notice, or (II) the Company consolidates or merges
          with any other corporation or entity and the consideration being
          provided to the holders of Common Stock in such merger or
          consolidation is at least two hundred percent (200%) of the Variable
          Conversion Price then in effect.

               Any Optional Redemption Notice delivered in accordance with this
     subsection (b) shall be accompanied by a statement executed by a duly
     authorized officer of its escrow agent, certifying the amount of funds
     which have been deposited with such escrow agent and that the escrow agent
     has been instructed and agrees to act as prepayment agent hereunder.

               (c) The Borrower shall effect the Redemption at Borrower s
     Election under this Section 1.2 by giving prior written notice (the
     "Optional Redemption Notice"), which notice may only be delivered on a
     business day, twenty (20) business days prior to the date on which such
     prepayment is to become effective (the "Effective Time of Redemption") to
     Holders of Debentures selected for prepayment at the address and facsimile
     number of such Holder appearing in the Borrower's register for the
     Debentures. Following delivery of an Optional Redemption Notice, the
     Borrower may not deliver another Optional Redemption Notice prior to the
     Effective Time of Redemption with respect to such existing Optional
     Redemption Notice. The Optional Redemption Notice shall indicate the
     Debentures selected for prepayment and the Optional Redemption Amount. The
     Optional Redemption Notice shall be deemed to have been delivered to a
     Holder: (i) if such fax is received by such holder on or prior to 3:00 p.m.
     Chicago time, on the time and date of transmission of Borrower's fax; and
     (ii) if such fax is received by Holder after 3:00 p.m. Chicago time, on the
     next business day following the date of transmission of Borrower's fax;
     provided that, for any notice required under this subsection 1.2(c) to be
     valid, a copy of such notice must be sent to the Holders on the same day by
     overnight courier.

               (d) The Optional Redemption Amount shall be paid to each Holder

<PAGE>



     whose Debentures are being prepaid at the Effective Time of Redemption;
     provided, however, that (i) the Borrower shall not be obligated to deliver
     any portion of the Optional Redemption Amount until either the Debentures
     being prepaid are delivered to the office of the Borrower or the escrow
     agent as provided in this subsection 1.2(d), or such Holder notifies the
     Borrower or the escrow agent that such Debentures have been lost, stolen or
     destroyed and delivers documentation in accordance with Section 10.10
     hereof and (ii) the aggregate principal amount of Debentures of any Holder
     that the Borrower shall be entitled to redeem in connection with any
     Optional Redemption Notice shall be reduced by the aggregate principal
     amount of Debentures which are converted (or with respect to which a Notice
     of Conversion (as defined in Section 3.1) is delivered to the Company)
     after delivery to such Holder of such Optional Redemption Notice and prior
     to the Effective Time of Redemption. Notwithstanding anything herein to the
     contrary, in the event that the Debentures being prepaid are not delivered
     to the Borrower or the escrow agent prior to the second business day
     following the Effective Time of Redemption, the prepayment of the
     Debentures pursuant to this Section 1.2 shall still be deemed effective as
     of the Effective Time of Redemption and the Optional Redemption Amount
     shall be paid to each Holder whose Debentures are being prepaid by 5:00
     p.m., Chicago time, on the next business day following the date on which
     the Debentures are actually delivered to the Borrower or the escrow agent.

               (e) If the Borrower fails to deliver the Optional Redemption
     Amount to the Holder on or before the Optional Redemption Date (an
      Optional Redemption Default ), the Borrower shall pay to Holder an amount
     equal to:

          (.24) x (D/365) x (Optional Redemption Amount)

     where:

           D means the number of days from the Optional Redemption Date through
     and including the date on which the Borrower delivers the Optional
     Redemption Amount to the Holder.

          The payments to which Holder shall be entitled pursuant to this
     subparagraph (e) are referred to herein as Redemption Default Payments.

               (f) In the event of any Optional Redemption Default, the Holder
     shall have the right (without limiting damages hereunder, the right to
     Redemption Default Payments or any other right or remedy), at any time
     prior to the Borrower s delivery of the Optional Redemption Amount to the
     Holder, to continue to treat the portion of this Debenture which was
     subject to redemption as outstanding for all purposes hereof, including
     conversion in accordance with the procedures set forth in Article III
     hereof at, however, the lowest Conversion Price in effect during the period
     beginning on, and including, the date of the Optional Redemption Notice
     which triggered the Borrower s rights pursuant to Section 1.2(a) above
     through and including the day shares of Class A Common Stock are delivered
     to the Holder upon such a conversion (assuming, for these purposes, that
     the Market Conversion Price is in effect). In addition, if the Borrower
     fails to pay an Optional Redemption Amount when due and owing, the Borrower
     shall thereafter forfeit its rights under this Article I to effect
     Redemption at Borrower s Election.

               (g) Notwithstanding the provisions of this Article I, (i) during
     the continuance of an Event of Failure and until cured or any occurrence
     which would with the passage of time, the giving of notice and/or the
     continuance thereof result in an Event of Failure and until cured and (ii)
     during any Permitted Blackout (as defined in the Registration Rights
     Agreement dated April 15, 1999 among the Company and the initial Holders
     (the "Registration Rights Agreement")), the Borrower shall lose its right
     to Redemption at Borrower's Election.

<PAGE>



                                   ARTICLE II
                               CERTAIN DEFINITIONS

          2.1 The following terms shall have the following meanings:

               (a) "Bankruptcy Event" shall mean any one or more of the
     following: (i) the commencement of any voluntary proceeding by the Company
     seeking entry of an order for relief under Title 11 of the United States
     Code or seeking any similar or equivalent relief under any other applicable
     federal or state law concerning bankruptcy, insolvency, creditors' rights
     or any similar law; (ii) the making by the Company of a general assignment
     for the benefit of its creditors; (iii) the commencement of any involuntary
     proceeding respecting the Company seeking entry of an order for relief
     against the Company in a case under Title 11 of the United States Code or
     seeking any similar or equivalent relief under any other applicable federal
     or state law concerning bankruptcy, insolvency, creditors' rights or any
     similar law; (iv) entry of a decree or order respecting the Company by a
     court having competent jurisdiction, which decree or order (x) results in
     the appointment of a receiver, liquidator, assignee, examiner, custodian,
     trustee, sequestrator (or other similar official) for the Company or for
     any substantial part of its property or (y) orders the winding up,
     liquidation, dissolution, reorganization, arrangement, adjustment, or
     composition of the Company or any of its debts; (v) the appointment,
     whether or not voluntarily by the Company, of a receiver, liquidator,
     assignee, examiner, custodian, trustee, sequestrator (or other similar
     official) for the Company or for any substantial part of its property; (vi)
     the failure by the Company to pay, or its admission in writing of its
     inability to pay, its debts generally as they become due; (vii) the
     exercise by any creditor of any right in connection with an interest of
     such creditor in any substantial part of the Company's property, including,
     without limitation, foreclosure upon all or any such part of the Company's
     property, replevin, or the exercise of any rights or remedies provided
     under the Uniform Commercial Code with regard thereto; (viii) the making
     of, or the sending of a notice of, a bulk transfer by the Company; (ix) the
     calling by the Company of a general meeting of its creditors or any portion
     of them; (x) the failure by the Company to file an answer or other pleading
     denying the material allegations of any proceeding described herein that is
     filed against it; and (xi) the consent by the Company to any of the
     actions, appointments, or proceedings described herein or the failure of
     the Company to contest in good faith any such actions, appointments, or
     proceedings. For purposes of this paragraph, the Company shall also refer
     to any material subsidiary thereof.

               (b) "Closing Bid Price" means, for any security as of any date,
     the closing bid price of such security on the principal securities exchange
     or trading market where such security is listed or traded as reported by
     Bloomberg Financial Markets or a comparable reporting service of national
     reputation selected by the Company and reasonably acceptable to each
     remaining initial Holder and, if no remaining initial Holders, the Holders
     of a majority of the aggregate principal amount represented by the then
     outstanding Debentures ("Majority Holders")(it being agreed that the
     consent of the Majority Holders requires the consent of each remaining
     initial Holder, if any) if Bloomberg Financial Markets is not then
     reporting closing bid prices of such security (collectively, "Bloomberg"),
     or if the foregoing does not apply, the last reported sale price of such
     security in the over-the-counter market on the electronic bulletin board of
     such security as reported by Bloomberg, or, if no sale price is reported
     for such security by Bloomberg, the average of the bid prices of any market
     makers for such security as reported in the "pink sheets" by the National
     Quotation Bureau, Inc. If the Closing Bid Price cannot be calculated for
     such security on such date on any of the foregoing bases, the Closing Bid
     Price of such security on such date shall be the fair market value as
     reasonably determined by an investment banking firm selected by the Company
     and reasonably acceptable to the Majority Holders, with the costs of such
     appraisal to be borne by the Company.

<PAGE>



               (c) "Closing Sale Price" means, for any security as of any date,
     the closing sale price of such security on the principal securities
     exchange or trading market where such security is listed or traded as
     reported by Bloomberg, or if the foregoing does not apply, the last
     reported sale price of such security in the over-the-counter market on the
     electronic bulletin board of such security as reported by Bloomberg, or, if
     no sale price is reported for such security by Bloomberg, the average of
     the bid prices of any market makers for such security as reported in the
     "pink sheets" by the National Quotation Bureau, Inc. If the Closing Sale
     Price cannot be calculated for such security on such date on any of the
     foregoing bases, the Closing Sale Price of such security on such date shall
     be the fair market value as reasonably determined by an investment banking
     firm selected by the Company and reasonably acceptable to the Majority
     Holders, with the costs of such appraisal to be borne by the Company.

               (d) "Conversion Amount", except as otherwise provided in Section
     3.3, means, (i) the portion of the principal amount of this Debenture
     elected by Holder to be converted (the "Selected Amount"), which amount may
     be all or any portion of the principal amount of this Debenture plus (ii)
     an amount equal to the product of (A) N divided by 365 times (B) .06 (but
     .08 if the Green Floor Price is applicable) times (C) the Selected Amount.

               (e) "Conversion Date" means, for any Optional Conversion, the
     date specified in the Notice of Conversion, or if no date is specified
     therein, the date the Notice of Conversion is faxed or otherwise delivered
     to the Company; provided, however, that the Conversion Date shall not be
     prior to the date of delivery (by facsimile or otherwise) of the Notice of
     Conversion and any Notice of Conversion delivered to the Company on a day
     which is not a business day shall be deemed delivered as of the next
     following business day.

               (f) "Conversion Price" means, with respect to any Conversion
     Date, the lower of the Variable Conversion Price and the Market Conversion
     Price, each as in effect as of such date and subject to adjustment as
     provided herein; provided, however:

                    (i) so long as a Material Adverse Change (as defined below)
          shall not have occurred, if the average Closing Sale Price of the
          Class A Common Stock for the ten (10) consecutive trading days ending
          on the first (1st) anniversary of the date of the Closing (subject to
          equitable adjustment for any stock splits, stock dividends,
          reclassifications or similar events during the such ten (10) trading
          day period) equals or exceeds the one hundred fifty percent (150%) of
          the Variable Conversion Price (as then in effect), then thereafter
          (but only for so long as a Material Adverse Change shall not have
          occurred) the Market Conversion Price may not be used for calculation
          of the Conversion Price; and

                    (ii) during the thirty (30) business day period commencing
          upon the expiration of a Permitted Blackout (as defined in the
          Registration Rights Agreement), the Conversion Price shall mean the
          lesser of (x) the Conversion Price with respect to such Conversion
          Date as determined in accordance with the foregoing provisions of this
          definition and (y) the lowest Conversion Price that would have been
          available during the period of such Permitted Blackout as determined
          in accordance with the foregoing provisions of this definition.

               (g) "Green Floor Price" means $4.4604, which amount equals
     seventy percent (70%) of the initial Variable Conversion Price, subject to
     adjustment as provided herein.

               (h) "Market Conversion Price" means, as of any Conversion Date,
     the lowest average of the Closing Bid Prices of the Class A Common Stock

<PAGE>



     occurring over any five (5) consecutive trading days during the ten (10)
     consecutive trading day period ending the day prior to the applicable
     Conversion Date (subject to equitable adjustment for any stock splits,
     stock dividends, reclassifications or similar events during the such ten
     (10) trading day period ) subject to adjustments as provided herein.

               (i) "N" means the number of days from the most recent Interest
     Payment Date to which interest has been paid, as if no Interest Payment
     Date has occurred, the day after the Issue Date to and including the
     Conversion Date, subject to Section 3.2 hereof, as specified in the notice
     of conversion in the form attached hereto (the "Notice of Conversion").

               (j) "Variable Conversion Price" means $6.372, which amount is one
     hundred and thirty five percent (135%) of the average of the closing bid
     price of the Class A Common Stock for the fifteen (15) consecutive trading
     days ending on the second (2nd) trading day immediately preceding the date
     of execution of the Securities Purchase Agreement (the "Initial Variable
     Conversion Price"); provided that on the first (1st) anniversary of the
     Issue Date, the Variable Conversion Price shall be adjusted to the greater
     of (A) the Weighted Average Sales Price of the Class A Common Stock for the
     ten (10) consecutive trading days immediately preceding the date of such
     1st anniversary and (B) the Green Floor Price, unless such adjustment would
     result in an increase in the Variable Conversion Price to a price above the
     Initial Variable Conversion Price hereunder, in which event, thereafter the
     Variable Conversion Price shall be such Initial Variable Conversion Price;
     provided further on the second (2nd) anniversary of the Issue Date, the
     Variable Conversion Price shall be adjusted to the greater of (A) the
     Weighted Average Sales Price of the Class A Common Stock for the ten (10)
     consecutive trading days immediately preceding the date of such 2nd
     anniversary and (B) the Green Floor Price, unless such adjustment would
     result in an increase of the Variable Conversion Price to a price above the
     Initial Variable Conversion Price hereunder, in which event, thereafter the
     Variable Conversion Price shall be such Initial Variable Conversion Price.
     The Variable Conversion Price is subject to further adjustment as provided
     herein.

                                   ARTICLE III
                                   CONVERSION

          3.1 Conversion at the Option of the Holder. Subject to the limitations
     on conversions contained in Section 3.7 hereof, the Holder may, at any time
     and from time to time, convert (an "Optional Conversion") a Conversion
     Amount into a number of fully paid and nonassessable shares of Class A
     Common Stock equal to the number determined by dividing such Conversion
     Amount by the Conversion Price.

          3.2 Mechanics of Conversion. In order to effect an Optional
     Conversion, a Holder (a "Converting Holder") shall fax (or otherwise
     deliver) a copy of the fully executed Notice of Conversion substantially in
     the form of Exhibit A (the "Notice of Conversion") to the Company for the
     Class A Common Stock. Upon receipt by the Company of a facsimile copy of a
     Notice of Conversion from a Converting Holder, the Company shall
     immediately send, via facsimile, a confirmation to the Converting Holder
     stating that the Notice of Conversion has been received, the date upon
     which the Company expects to deliver the Class A Common Stock upon
     conversion and the name and telephone number of a contact person at the
     Company regarding the conversion. Promptly following the faxing (or other
     delivery) of the Notice of Conversion, the Holder shall surrender or cause
     to be surrendered to the Company, this Debenture, along with a copy of the
     Notice of Conversion.

          3.3  Company's Obligations Upon Conversion.

               Delivery of Common Stock.   Subject to Section 3.6  hereof, upon
     the delivery  of a  Notice of  Conversion, the Company  shall, as  soon as
     practicable  but in any event no later than  the later of (a) the day that

<PAGE>



     is three business days following the Conversion Date and (b) the day that
     is the first business day following the date of surrender of this Debenture
     (or delivery of documentation in accordance with Section 10.10 hereof) (the
     "Delivery Period"), issue and deliver to the Converting Holder (x) that
     number of shares of Class A Common Stock issuable upon conversion of the
     portion of this Debenture being converted (the "Converted Portion") and (y)
     a new Debenture in the form hereof representing the balance of the
     principal amount hereof not being converted, if any. Delivery under this
     Section 3.3 may be made personally or by reputable overnight courier. The
     person or persons entitled to receive shares of Class A Common Stock
     issuable upon such conversion shall be treated for all purposes as the
     record holder of such shares at the close of business on the Conversion
     Date and such shares shall be issued and outstanding as of such date. The
     Company may elect (the "Cash Election") for any given calendar month to pay
     in cash the accrued and unpaid interest due on the date of delivery of the
     Notice of Conversion on the Converted Portion upon the delivery of all
     Notices of Conversion during such calendar month, rather than issuing
     shares of Class A Common Stock for such amounts; provided, however that the
     Company must deliver to each Holder irrevocable written notice of its Cash
     Election by the twentieth (20th) day of the previous calendar month.

          3.4 Taxes. The Company shall pay any and all taxes (other than
     transfer taxes) which may be imposed with respect to the issuance and
     delivery of the shares of Class A Common Stock upon the conversion of this
     Debenture.

          3.5 No Fractional Shares. No fractional shares of Class A Common Stock
     are to be issued upon the conversion of this Debenture, but the Company
     shall instead round up to the next whole number the number of shares of
     Class A Common Stock to be issued upon such conversion.

          3.6 Conversion Disputes. In the case of any dispute with respect to a
     conversion, the Company shall promptly issue such number of shares of Class
     A Common Stock as are not disputed in accordance with Sections 3.1 and 3.3
     hereof. If such dispute only involves the calculation of the Conversion
     Price, the Company shall submit the disputed calculations to an independent
     accounting firm of national standing (acceptable to the Converting Holder)
     via facsimile within two (2) business days of receipt of the Notice of
     Conversion. The accountant shall audit the calculations and notify the
     Company and the Converting Holder of the results no later than two (2)
     business days from the date it receives the disputed calculations. The
     accountant's calculation shall be deemed conclusive, absent manifest error.
     As soon as possible thereafter, the Company shall then issue the
     appropriate number of shares of Class A Common Stock in accordance with
     Sections 3.1 and 3.3 hereof.

          3.7 Limitations on Conversions. The conversion of this Debenture shall
     be subject to the following limitations (each of which limitations shall be
     applied independently):

               (a) Cap Amount. Prior to Shareholder Approval, unless otherwise
     permitted by The Nasdaq National Market or unless the rules thereof no
     longer are applicable to the Company, in no event shall the total number of
     shares of Common Stock issued upon conversion of the Debentures and
     exercise of the Warrants (as defined in the Securities Purchase Agreement)
     exceed the maximum number of shares of Common Stock that the Company can
     without stockholder approval so issue pursuant to Nasdaq Rule 4460(i) (or
     any successor rule) (the "Cap Amount") upon the conversion of the
     Debentures and the exercise of the Warrants, which, as of the date of
     initial issuance of the Debentures and Warrants, shall be 7,291,107 shares
     (or any such higher number as the rules permit, it being understood and
     agreed that, to the extent required by Nasdaq Rule 4460(i), no shares
     acquired upon conversion of this Debenture or exercise of the Warrants
     shall be entitled to vote in such Shareholder Approval). The Cap Amount
     shall be allocated pro-rata to the Holders as provided in Section 10.1

<PAGE>



     hereof. A Holder s allocable portion of the Cap Amount shall be applicable
     to both Debentures and Warrants held by it and shall be applied to such
     Debentures and Warrants on the basis of the time of conversion or exercise,
     as the case may be, thereof.

               (b) No Five Percent Holders. Notwithstanding anything to the
     contrary contained herein, the Debentures shall not be convertible by a
     Holder to the extent (but only to the extent) that, if convertible by such
     Holder, such Holder would beneficially own in excess of 4.9% (the
     "Applicable Percentage") of the shares of Class A Common Stock. To the
     extent the above limitation applies, the determination of whether the
     Debentures shall be exercisable (vis-a-vis other securities owned by Holder
     which contain similar limitations on conversion) and of which Debentures
     shall be exercisable (as among Debentures) shall be made on the basis of
     the earliest submission of the Debentures (vis-a-vis other securities owned
     by the Holder which contain similar limitations on conversion and vis a vis
     other Debentures), in each case subject to such aggregate percentage
     limitation. No prior inability to convert Debentures pursuant to this
     paragraph shall have any effect on the applicability of the provisions of
     this paragraph with respect to any subsequent determination of
     convertibility. For the purposes of this paragraph, beneficial ownership
     and all determinations and calculations, including without limitation, with
     respect to calculations of percentage ownership, shall be determined in
     accordance with Section 13(d) of the Securities Exchange Act of 1934, as
     amended, and Regulation 13D and G thereunder. The provisions of this
     paragraph may be implemented in a manner otherwise than in strict
     conformity with the terms of this Section with the approval of the Board of
     Directors of the Company and the Holder: (i) with respect to any matter to
     cure any ambiguity herein, to correct this paragraph (or any portion
     hereof) which may be defective or inconsistent with the intended Applicable
     Percentage beneficial ownership limitation herein contained or to make
     changes or supplements necessary or desirable to properly give effect to
     such Applicable Percentage limitation; and (ii) with respect to any other
     matter, with the further consent of the holders of a majority of the then
     outstanding shares of Class A Common Stock. For clarification, it is
     expressly a term of this security that the limitations contained in this
     Section shall apply to each successor Holder.

               (c) Material Adverse Change. Notwithstanding anything to the
     contrary contained herein, the Debentures shall not be convertible until
     the earlier of (i) the one hundred eightieth (180th) day following the
     Issue Date, (ii) the occurrence of a Material Adverse Change (as herein
     defined), and (iii) an Operating Expense Reduction Failure. For the
     purposes of this Debenture, a "Material Adverse Change" means any change
     which has a material adverse effect on the business, operations,
     properties, financial condition, or operating results of the Company and
     its subsidiaries, taken as a whole on a consolidated basis; provided,
     however, a Material Adverse Change shall not include (i) adverse general
     economic conditions, (ii) adverse general industry conditions in the
     industry in which the Company operates or (iii) of itself: (x) a decline in
     the Company s stock price, (y) failure to achieve any projection or (z)
     failure to be awarded any particular contract. The Company shall provide
     prompt written notice of the occurrence of Material Adverse Change (but in
     any event within five (5) business days thereof). In the event that a
     Holder provides written notice to the Company that such Holder believes
     that a Material Adverse Change has occurred (a "Material Adverse Change
     Notice"), such notice shall be binding upon the Company unless, within five
     (5) business days thereafter, the Board of Directors of the Company, based
     on its good faith business judgement and upon advice of an investment
     banking firm of national standing shall dispute the occurrence of such
     Material Adverse Change. If the Company shall so dispute the occurrence of
     a Material Adverse Change, it shall, within three (3) business days after
     notice of such dispute by a Holder, submit such dispute to an independent
     investment bank of national standing (acceptable to such Holder). The
     investment banking firm shall determine whether the

<PAGE>



     Material Adverse Change has occurred, and notify the Company and Holder of
     such determination no later than ten (10) days after such submission. The
     investment bank s determination shall be deemed conclusive. In the event
     that the investment bank shall determine that a Material Adverse Change has
     occurred, then during the Restoration Period immediately following the
     resolution of such dispute the "Conversion Price" shall mean the lesser of
     (a) the Conversion Price determined in accordance with Section 2(f) or (b)
     the lowest Conversion Price that would have been available had there been
     no dispute by the Company as to the existence of a Material Adverse Charge.
     The term "Restoration Period" means a number of business days during which
     there exists such a dispute as to the existence of a Material Adverse
     Change. An Operating Expense Reduction Failure shall mean the failure of
     the Company to announce, by filing of a Current Report on Form 8-K by June
     15, 1999, a bona fide and credible plan, adopted by the Board of Directors
     of the Company in its good faith business judgment, which reasonably
     provides for the reduction of operating expenses of the Company by $10
     million over a twelve (12) month period (before giving effect to any
     acquisitions) and which is implemented within thirty (30) days of such
     announcement.

               (d) Cap Debenture Election. In addition to the foregoing
     limitations, the Company may, upon written irrevocable notice to all
     Holders within ten (10) days of a Triggering Event (as defined below),
     elect (a "Cap Debenture Election") to exchange the Excess Debentures (as
     defined herein) for a twelve-month subordinated note of the Company having
     a face amount equal to such Excess Debentures plus accrued and unpaid
     interest thereon, which note shall bear interest at twelve percent (12%)
     per annum and contain such other terms and conditions as are reasonably
     requested and reasonably acceptable to Holder (a "Cap Debenture"). Such
     notice shall serve as binding and irrevocable notice of the Company's
     election to exercise the Cap Debenture Election as to all Holders, and the
     Company shall, within five (5) business days after such election,
     thereafter exchange the Excess Debentures for a Cap Debenture (but not as
     to any Holder prior to the occurrence of a Triggering Event as to such
     Holder). For purposes hereof, the "Excess Debentures" means that portion of
     the Debentures which, following actual submission of a Notice of Conversion
     by a Holder would, if converted in accordance with the terms hereof (other
     than this paragraph (d)), would result in such Holder beneficially owning
     in excess of such Holder's Cap Portion (as defined below). For any Holder,
     the "Cap Portion" means such Holder's pro rata share of twenty percent
     (20%) of the number of outstanding shares of Common Stock at the time of
     the Closing, based on such Holder's initial investment in the Debentures
     issued at the Closing.

          For purposes hereof, a "Triggering Event" shall be deemed to have
     occurred following actual submission of a Notice of Conversion by a Holder
     if the Company shall not have breached any representation, warranty,
     covenant or agreement made pursuant to the Investment Agreements, no Event
     of Failure (or event which, with notice, passage of time and/or
     continuation, would constitute an Event of Failure) has occurred and is
     continuing, and the Company has met the Solvency Condition (as defined
     below) and the number of shares of Class A Common Stock (the "Closing
     Shares") issued to such Holder upon conversion of the Debentures would, but
     for the Company making a Cap Debenture Election and the issuance of the Cap
     Debentures, equal or exceed such Holder's Cap Portion. Solvency Conditions
     means that the Company shall be in such financial condition as contemplated
     by the Solvency Certificate issued in connection with the issuance of the
     Debentures, as if however, the Solvency Certificate were addressing the
     issuance of the Cap Debentures as of the date of the Cap Debenture Election
     including, without limitation, the ability to so pay such Cap Debentures,
     and taking account of then current projections of the Company; and the
     Company shall have issued a new Solvency Certificate to such effect as of
     the date of the Cap Debenture Election.

          The limitations contained in this paragraph (d) shall apply on a
     Holder-by-Holder basis with respect to Debentures issued to such Holder at

<PAGE>



     the  Closing, and  any transferee Holder  shall be  subject to  a pro rata
     portion of such limitation.

          3.8  Intentionally omitted.

          3.9 Electronic Transmission. In lieu of delivering physical
     certificates representing the Common Stock issuable upon conversion,
     provided the Borrower's escrow agent is participating in the Depository
     Trust Company ("DTC") Fast Automated Securities Transfer program (the
      FAST Program ), upon request of a Holder, the Borrower shall use its
     reasonable best efforts to cause its escrow agent to electronically
     transmit the Common Stock issuable upon conversion to the Holder by
     crediting the account of Holder's prime broker with DTC through its Deposit
     Withdrawal Agent Commission system. The Borrower shall use its reasonable
     best efforts to participate in the FAST Program.

                                   ARTICLE IV
                      RESERVATION OF SHARES OF COMMON STOCK

          4.1 Reserved Amount. At the Issue Date and thereafter, the Company
     shall have authorized and reserved and keep available for issuance not less
     than 8,500,000 (subject to equitable adjustment for any stock splits, stock
     dividends, reclassification or similar events and subject to reduction for
     the number of any shares of Class A Common Stock issued upon conversion of
     the Convertible Securities and upon exercise of the Warrants) shares of
     Class A Common Stock (the "Reserved Amount") solely for the purpose of
     effecting the conversion of the Convertible Securities and the exercise of
     the Warrants. The Company shall at all times reserve and keep available out
     of its authorized but unissued shares of Class A Common Stock the Reserved
     Amount. The Reserved Amount shall be allocated among the Holders as
     provided in Section 10.1 hereof. Notwithstanding anything contained herein,
     the Reserved Amount shall at no time exceed the Cap Amount; so long as the
     Reserved Amount is greater than the Cap Amount, the Reserved Amount shall
     equal the Cap Amount.

          4.2 Increases to Reserved Amount. Without limiting any other provision
     of this Article IV, if a Holder's allocable portion of the Reserved Amount
     for any three (3) consecutive trading days (the last of such three (3)
     trading days being the "Authorization Trigger Date") shall be less than one
     hundred seventy five percent (175%) of the number of shares of Class A
     Common Stock issuable upon conversion of such Holder's Debenture and 100%
     of the number of shares of Class A Common Stock issuable upon exercise of
     such Holder's Warrants on such trading days (in each case without giving
     effect to any limitation on conversion or exercise thereof), the Company
     shall immediately notify all Holders of such occurrence and shall take
     action as soon as possible, but in any event within sixty (60) days after
     an Authorization Trigger Date (including, if necessary, shareholder
     approval to authorize the issuance of additional shares of Class A Common
     Stock), to increase the Reserved Amount so that each Holder's allocable
     portion thereof shall equal or exceed two hundred percent (200%) of the
     number of shares of Class A Common Stock then issuable upon conversion of
     such Holder's Debenture and 100% of the number of shares of Class A Common
     Stock issuable upon exercise of such Holder's Warrants (in each case
     without giving effect to any limitation on conversion or exercise thereof).

                                    ARTICLE V
                     COMPLIANCE WITH CAP AMOUNT RESTRICTIONS

          Obligation to Notify. If at any time after the Issue Date the then
     unissued portion of any Holder s Cap Amount is less than one hundred
     seventy-five percent (175%) of the number of shares of Class A Common Stock
     then issuable upon conversion of such Holder s Debentures and exercise of
     such Holder s Warrants (in each case without giving effect to any
     limitation on conversion or exercise thereof), the Company shall
     immediately notify all Holders of such occurrence.

<PAGE>



                                   ARTICLE VI
                         FAILURE TO SATISFY CONVERSIONS

          6.1 Conversion Default Payments. If, at any time, (x) a Holder submits
     a Notice of Conversion and the Company fails for any reason (other than to
     the extent (but only to the extent) that such failure is as a result of a
     dispute as to the occurrence of a Material Adverse Change as to which the
     provisions of Section 3.7(c) shall apply) to deliver, on or prior to the
     expiration of the Delivery Period for such conversion, such number of
     shares of Class A Common Stock to which such Holder is entitled upon such
     conversion, or (y) the Company provides notice (including by way of public
     announcement) to any Holder at any time of its intention not to issue
     shares of Class A Common Stock upon exercise by any Holder of its
     conversion rights in accordance with the terms of the Debentures (each of
     (x) and (y) being a "Conversion Default"), then the Company shall pay to
     such Holder damages in an amount equal to the product of (A) the Damages
     Amount times (B) D times (C) .01, where:

          "D" means, with respect to clause (x), the number of days beginning
     and including the day after the date of the Conversion Default through and
     including the Cure Date with respect to such Conversion Default, and with
     respect to clause (y), the number of days beginning and including the date
     of the Conversion Default through and including the Cure Date with respect
     to such Conversion Default

          "Damages Amount" means the Conversion Amount with respect to which
     such Conversion Default occurred (all outstanding principal amount of
     Debentures in the case of clause (y)) plus all accrued and unpaid interest
     thereon as of the first day of the Conversion Default.

          "Cure Date" means (i) with respect to a Conversion Default described
     in clause (x) of its definition, the date the Company effects the
     conversion of the portion of this Debenture submitted for conversion and
     (ii) with respect to a Conversion Default described in clause (y) of its
     definition, the date the Company undertakes in writing to issue Class A
     Common Stock in satisfaction of all conversions of Debentures in accordance
     with their terms.

          The payments to which a Holder shall be entitled pursuant to this
     Section 6.1 are referred to herein as "Conversion Default Payments." All
     Conversion Default Payments shall be paid in cash within five (5) business
     days of a Holder's demand therefore (which demand may be made at any time
     and from time to time).

          6.2 Buy-In Cure. If (i) the Company fails for any reason to deliver
     during the Delivery Period shares of Class A Common Stock to a Holder upon
     a conversion of this Debenture and (ii) after the applicable Delivery
     Period with respect to such conversion, a Holder purchases (a "Buy-In") (in
     an open market transaction or otherwise) shares of Class A Common Stock to
     make delivery upon a sale by a Holder of the shares of Class A Common Stock
     (the "Sold Shares") which such Holder anticipated receiving upon such
     conversion, the Company shall pay such Holder (in addition to any other
     remedies available to Holder) the amount by which (x) such Holder's total
     purchase price (including brokerage commission, if any) for the shares of
     Class A Common Stock so purchased exceeds (y) the net proceeds received by
     such Holder from the sale of the Sold Shares. For example, if a Holder
     purchases shares of Class A Common Stock having a total purchase price of
     $11,000 to cover a Buy-In with respect to shares of Class A Common Stock
     sold for $10,000, the Company will be required to pay such Holder $1,000. A
     Holder shall provide the Company written notification indicating any
     amounts payable to Holder pursuant to this Section 6.2.

          6.3 Adjustment to Conversion Price. If a Holder has not received
     certificates for all shares of Class A Common Stock within two business
     days following the expiration of the Delivery Period with respect to a

<PAGE>



     conversion of any portion of any of such Holder's Debentures, then the
     Variable Conversion Price shall, with respect to such conversion and
     thereafter, be the lesser of (i) the Variable Conversion Price on the
     Conversion Date specified in the Notice of Conversion which resulted in the
     Conversion Default and (ii) the lowest Conversion Price in effect during
     the period beginning on, and including, such Conversion Date through and
     including the Cure Date. If there shall occur a Conversion Default of the
     type described in clause (y) of Section 6.1 hereof, then the Variable
     Conversion Price with respect to any conversion thereafter shall be the
     lower of the Variable Conversion Price and the lowest Conversion Price in
     effect at any time during the period beginning on, and including, the date
     of the occurrence of such Conversion Default through and including the Cure
     Date. Simultaneously with any reduction of the Variable Conversion Price
     pursuant to this Section 6.3, the Green Floor shall be reduced
     proportionately. For purposes of this Section, the Conversion Price shall
     include the Market Conversion Price whether or not the Market Conversion
     Price is otherwise applicable. The Variable Conversion Price shall
     thereafter be subject to further adjustment as provided in this Debenture
     (including by virtue of re-application of this Section 6.3), but shall not
     be subject to upward adjustment.

                                   ARTICLE VII
                                EVENTS OF FAILURE

          7.1 Holder s Option to Demand Redemption. Upon the occurrence of an
     Event of Failure, each Holder shall have the right to elect at any time and
     from time to time to have all or any portion of such Holder s then
     outstanding Debentures prepaid by the Company for an amount equal to the
     Holder Demand Redemption Amount (as herein defined).

               (a) The right of a Holder to elect prepayment shall be
     exercisable upon the occurrence of an Event of Failure by such Holder in
     its sole discretion by delivery of a Demand Redemption Notice (as herein
     defined) in accordance with the procedures set forth in this Article 7.
     Notwithstanding the exercise of such right, the Holder shall be entitled to
     exercise all other rights and remedies available under the provisions of
     this Debenture and at law or in equity.

               (b) A Holder shall effect each demand for prepayment under this
     Article VII by giving at least two (2) business days prior written notice
     (the "Demand Redemption Notice") of the date on which such prepayment is to
     become effective (the Effective Date of Demand of Redemption ), the
     Debentures selected for prepayment and the Holder Demand Redemption Amount
     to the Borrower at the address and facsimile number provided in Section
     10.2, which Demand Redemption Notice shall be deemed to have been delivered
     on the business day after the date of transmission of Holder's fax (with a
     copy sent by overnight courier to the Borrower) of such notice.

               (c) The Holder Demand Redemption Amount shall be paid to a Holder
     whose Debentures are being prepaid within one (1) business day following
     the Effective Date of Demand of Redemption.

               (d) Promptly following the date on which the Debentures are
     prepaid, Holder shall (i) deliver such Debentures to the office of the
     Borrower or the transfer agent or notify the Borrower or the transfer agent
     that such Debentures have been lost, stolen or destroyed and (ii) deliver
     the documentation required in accordance with Section 10.10 hereof.

          7.2 Holder Demand Redemption Amount. The Holder Demand Redemption
     Amount means (a) in the case of any Event of Failure provided in clauses
     (i), (m), (n), (o), (p) and (r) of Section 7.3 or a default in the cash
     payment of principal or interest due hereunder (a "Lesser Failure"), 1.15
     times the aggregate principal amount of the Debenture for which demand is
     being made (the "Stated Value"), plus all accrued and unpaid interest

<PAGE>



     thereon through the date of prepayment and (b) in the case of an Event of
     Failure other than a Lesser Failure (a "Greater Failure"), the greater of:
     (i) 1.35 times the Stated Value plus all accrued and unpaid interest
     thereon through the date of prepayment and (ii) the product of (A) the
     highest price at which the Class A Common Stock is traded from the date of
     the Event of Failure through the date of the Effective Date of Demand of
     Redemption (or the most recent highest closing sale price if the Class A
     Common Stock is not traded between such dates) divided by the lowest
     Conversion Price during such period (assuming for these purposes that the
     Market Conversion Price is in effect, regardless of whether it is not
     actually in effect), and (B) the sum of the Stated Value plus all accrued
     and unpaid interest thereon through the date of prepayment. The Holder
     Demand Redemption Amount shall be reduced by the amount of any Default
     Alternative Payments made in respect of this Debenture pursuant to Section
     7.5 (but shall not apply principal except to the extent such Default
     Alternative Payments exceed 35% of the principal amount upon which such
     Default Alternative Payments were based).

          7.3 Events of Failure. An Event of Failure means any one of the
     following:

               (a) a Conversion Default described in Section 6.1 hereof occurs
     and is not cured by the Company within three (3) business days after its
     occurrence;

               (b) the Company fails, and such failure continues uncured for six
     (6) business days after the Company has been notified thereof in writing by
     a Holder, to satisfy the requirements of Section 4.1 hereof;

               (c) subject to any Permitted Blackout (as defined in the
     Registration Rights Agreement), the Registration Statement required to be
     filed by the Company pursuant to the Registration Rights Agreement, has not
     been filed within thirty (30) business days of the Closing or has not been
     declared effective by the two hundred and seventieth (270th) day following
     the Closing or such Registration Statement, after being declared effective,
     cannot be utilized by the Holders of Debentures and the Warrants for the
     resale of all of their Registrable Securities (as defined in the
     Registration Rights Agreement) for a period of five (5) consecutive
     business days or for an aggregate of more than ten (10) days in any twelve
     (12) month period;

               (d) the Class A Common Stock (or any portion thereof) is
     suspended from trading on any of, or is not listed (and authorized) for
     trading on any of, The Nasdaq National Market or the New York Stock
     Exchange for an aggregate of five (5) trading days in any nine (9) month
     period;

               (e) the Company fails, and any such failure continues uncured for
     ten (10) days after the Company has been notified thereof in writing by the
     Holder, to remove any restrictive legend on any certificate or any shares
     of Class A Common Stock issued to the Holders of Debentures or Warrants
     upon conversion of the Debentures or exercise of the Warrants (as the case
     may be);

               (f) the Company breaches, and such breach continues uncured for
     ten (10) business days after the Company has been notified thereof in
     writing by a Holder, any material covenant or other material term or
     condition of this Debenture, the Warrants, the Securities Purchase
     Agreement, the Security Agreement or the Registration Rights Agreement,
     including, without limitation, any default in payment of principal,
     interest or other amounts due hereunder or under the Registration Rights
     Agreement;

               (g) any representation or warranty of the Company made herein or
     in any agreement, statement or certificate given in writing pursuant hereto
     or in connection herewith (including, without limitation, this

<PAGE>



     Debenture, the  Warrants, the Securities Purchase  Agreement, the Security
     Agreement and  the  Registration  Rights  Agreement), shall  be  false  or
     misleading in any material respect when made;

               (h) the Company fails to increase the Reserved Amount in
     accordance with Section 4.2 hereof;

               (i)  a Bankruptcy Event occurs;

               (j) the Company provides notice to any Holder, including by way
     of public announcement, at any time, of its intention not to issue shares
     of Class A Common Stock to any Holder upon conversion in accordance with
     the terms of the Debentures (other than because such issuance would exceed
     such Holder's allocated portion of the Cap Amount);

               (k) the Company's execution or performance of its obligations
     under this Debenture, the Warrants, the Securities Purchase Agreement or
     the Registration Rights Agreement (the "Documents") constitutes a breach
     under any existing agreement of the Company (or would cause a default or
     acceleration (or right of acceleration) under such existing agreement), or
     the Company enters into any new agreement under which performance of any
     material obligation under the Documents would be a breach or cause a
     default or acceleration (or right of acceleration) under such new
     agreement;
               (l) the Company fails to obtain the effectiveness of any
     amendment to an existing registration statement within five (5) days or of
     any new registration statement within ten (10) days as required by the
     Registration Rights Agreement;

               (m) an Event of Default (as defined in the Loan Agreement)
     (without giving effect to any waiver or indulgence by the lender which
     materially increases the amount required to be paid under the Loan
     Agreement as of the date of this Debenture), occurs or an acceleration
     occurs under the Loan Agreement;

               (n) The Company or any of its subsidiaries (i) defaults in the
     payment of principal or interest on any other indebtedness of five hundred
     thousand dollars ($500,000) or more beyond the applicable period of grace,
     if any, or (ii) fails to observe or perform any covenant or agreement
     contained in any agreement(s) or instrument(s) relating to any other
     indebtedness of five hundred thousand dollars ($500,000) or more in the
     aggregate within any applicable grace period, or any other event shall
     occur, if the effect of such failure or other event is to cause the
     acceleration of the maturity of five hundred thousand dollars ($500,000) or
     more in the aggregate of such indebtedness; or five hundred thousand
     dollars ($500,000) or more in the aggregate of any indebtedness is required
     to be prepaid (other than by regularly scheduled required prepayment) in
     whole or in part prior to its stated maturity;

               (o) The Company receives from its independent certified
     accounting firm in connection with its audited financial statements a
     "going concern" qualification or exception;

               (p) a judgment which, together with other undischarged judgments
     against the Company, is in excess of five hundred thousand dollars
     ($500,000) is rendered against the Company and, within sixty (60) days
     after entry thereof, such judgment is not discharged or execution thereof
     is not stayed pending appeal, or within sixty (60) days after the
     expiration of such stay, such judgment is not discharged;

               (q) the Shareholder Approval required to be obtained by the
     Company is not effective by September 30, 1999; or

               (r) an event of default under the Cap Debentures occurs.

          7.4  Failure  to Pay Damages Amount. The Company shall pay the Holder

<PAGE>



     Demand Redemption Amount within five (5) days of receipt of a written
     request therefor by a Holder. In the event the Company is not able to pay
     all amounts due and payable with respect to all Debentures subject to
     Holder Demand Redemption Notices, the Company shall pay the Holders such
     amounts pro rata, based on the total amounts payable to such Holder
     relative to the total amounts payable to all Holders. During the
     continuance of an Event of Failure (the "Failure Period"), the Conversion
     Price shall mean the lowest Conversion Price at any time during the Failure
     Period (notwithstanding the actual Conversion Date) determined in
     accordance with the foregoing provisions of the definition (but assuming
     that for these purposes that the Market Conversion Price is in effect,
     regardless of whether it is not actually in effect).

          7.5 Default Alternative. Upon the occurrence of a Greater Failure, a
     Holder may elect by written notice to the Company (a "Default Alternative
     Election") to forebear from requiring a prepayment of this Debenture
     pursuant to Section 7.1 and to receive cash payments from the Company, and
     if the Holder makes such election the Company shall pay to the Holder, in
     an amount per day equal to one (1%) percent of the outstanding principal
     amount of the Debenture, not to exceed one hundred thirty five percent
     (135%) of such outstanding amount ("Default Alternative Payment"). The
     delivery by a Holder of a Default Alternative Election in connection with
     an Event of Failure shall not preclude such Holder from subsequently
     exercising its rights under Section 7.1 in connection with such Event of
     Failure and any prior or subsequent Event of Failure. Payments may also be
     made under this Section 7.5 with respect to Lesser Failures up to an
     aggregate of one hundred fifteen percent (115%) of such outstanding amount
     (also a "Default Alternative Payment") as contemplated by the Subordination
     Agreement.

                                  ARTICLE VIII
                       ADJUSTMENTS TO THE CONVERSION PRICE

          The Conversion Price shall be subject to adjustment from time to time
     as follows:

          8.1 Stock Splits, Stock Dividends, Etc. If at any time on or after the
     date of issuance of this Debenture, the number of outstanding shares of
     Class A Common Stock is increased by a stock split, stock dividend,
     combination, reclassification or other similar event, the Variable
     Conversion Price, the Market Conversion Price and the Green Floor Price
     shall each be proportionately reduced, or if the number of outstanding
     shares of Class A Common Stock is decreased by a reverse stock split,
     combination or reclassification of shares, or other similar event, the
     Variable Conversion Price, the Market Conversion Price and the Green Floor
     Price shall each be proportionately increased. In such event, the Company
     shall notify the Company's transfer agent of such change on or before the
     effective date thereof.

          8.2 Certain Public Announcements. In the event that (i) the Company
     makes a public announcement that it intends to consolidate or merge with
     any other entity (other than a merger in which the Company is the surviving
     or continuing entity and its capital stock is unchanged and there is no
     distribution thereof) or to sell or transfer all or substantially all of
     the assets of the Company or (ii) any person, group or entity (including
     the Company) publicly announces a tender offer in connection with which
     such person, group or entity seeks to purchase 50% or more of the Common
     Stock (the date of the announcement referred to in clause (i) or (ii) of
     this paragraph is hereinafter referred to as the "Announcement Date"), then
     the Conversion Price shall, effective upon the Announcement Date and
     continuing through the consummation of the proposed tender offer or
     transaction or the Abandonment Date (as defined below) or thirty (30) days
     after announcement, whichever is sooner, be equal to the lesser of (x) the
     Conversion Price calculated as provided in Article II hereof and (y) the
     Conversion Price which would have otherwise have been applicable for
     Conversion occurring on the Announcement Date. From and

<PAGE>



     after the Abandonment Date or the thirtieth (30th) day after announcement,
     as the case may be, the Conversion Price shall be determined as set forth
     in Article II hereof. The "Abandonment Date" means with respect to any
     proposed transaction or tender offer for which a public announcement as
     contemplated by this paragraph has been made, the date which is seven (7)
     trading days after the date upon which the Company (in the case of clause
     (i) above) or the person, group or entity (in the case of clause (ii)
     above) publicly announces the termination or abandonment of the proposed
     transaction or tender offer which causes this paragraph to become
     operative.

          8.3 Major Transactions. If the Company shall consolidate or merge with
     any other corporation or entity (other than a merger in which the Company
     is the surviving or continuing entity and its capital stock is unchanged
     and unissued in such transaction (except for issuances which do not exceed
     20% of the Class A Common Stock and do not result in a Change of Control))
     or there shall occur any share exchange pursuant to which all of the
     outstanding shares of Common Stock are converted into other securities or
     property or any reclassification or change of the outstanding shares of
     Common Stock or the Company shall sell all or substantially all of its
     assets or there shall occur a Change of Control (each of the foregoing
     being a "Major Transaction"), then each Holder shall thereafter be entitled
     to receive consideration, in exchange for such Debenture, equal to the
     greater of, as determined in the sole discretion of such Holder: (i) if
     applicable, the number of shares of stock or securities or property of the
     Company, or of the entity resulting from such Major Transaction (the "Major
     Transaction Consideration"), to which a holder of the number of shares of
     Class A Common Stock delivered upon conversion of such Debenture would have
     been entitled upon such Major Transaction had the Holder of such Debenture
     exercised its right of conversion (without regard to any limitations on
     conversion herein or elsewhere contained) on the trading date immediately
     preceding the public announcement of the transaction resulting in such
     Major Transaction and had such Class A Common Stock been issued and
     outstanding and had such Holder been the holder of record of such Class A
     Common Stock at the time of the consummation of such Major Transaction and
     (ii) one hundred twenty five percent (125%) of the principal amount of this
     Debenture in cash; and the Company shall make lawful provision therefor as
     a part of such Major Transaction and shall cause the issuer of any security
     in such transaction which constitutes Registrable Securities under the
     Registration Rights Agreement to assume all of the Company obligations
     (provided any cash election pursuant to clause (ii) above must be made in
     writing to the Company within ten (10) business days following consummation
     of such applicable transaction (or, in the event that a Company Transaction
     (as defined below) occurs, within ten (10) business days following the
     Measurement Period (as defined below)). In the event that the Company shall
     merge with any other corporation in a transaction in which common stock of
     the surviving corporation or the parent thereof (the "Exchange Securities")
     is issued to the holders of Class A Common Stock in such transaction in
     exchange for all such Class A Common Stock, and (a) the Exchange Securities
     are publicly traded, (b) the average daily trading volume of the Exchange
     Securities during the one hundred eighty (180) day period ending on the
     date on which such transaction is publicly disclosed is greater than two
     million dollars ($2,000,000), (c) the historical one hundred (100) day
     volatility of the Exchange Securities during the period ending on the date
     on which such transaction is publicly disclosed is greater than sixty
     percent (60%), and (d) the market capitalization of the issuer of the
     Exchange Securities is not less than one hundred fifty million dollars
     ($150,000,000) based on the last sale price of the Exchange Securities on
     the date immediately before the date on which such transaction is publicly
     disclosed (in each case, with respect to the foregoing clauses (a) through
     (d), as reported by Bloomberg), then the provisions of clause (ii) of the
     preceding sentence shall not apply. In the event that the Company shall, in
     a Major Transaction, merge with any other corporation in a transaction in
     which the Company is the survivor (a "Company Transaction"), the provisions
     of clause (ii) of the second

<PAGE>



     preceding sentence shall not apply to the extent that each of the following
     conditions remain true for the thirty (30) business days commencing as of
     the date of the consummation of such transaction (the "Measurement Period":
     (a) the Class A Common Stock remains publicly traded during the period, (b)
     the average daily trading volume of the Class A Common Stock is greater
     than two million dollars ($2,000,000), (c) the historical thirty (30) day
     volatility of the Company s Class A Common Stock is greater than sixty
     percent (60%), and (d) the market capitalization of the Company (including
     Class B Common Stock) is not less than one hundred fifty million dollars
     ($150,000,000) on the last day of the period (in each case, with respect to
     the foregoing clauses (a) through (d), as reported by Bloomberg). No sooner
     than ten (10) days nor later than five (5) days prior to the consummation
     of the Major Transaction, but not prior to the public announcement of such
     Major Transaction, the Company shall deliver written notice ("Notice of
     Major Transaction") to each Holder, which Notice of Major Transaction shall
     be deemed to have been delivered one (1) business day after the Company s
     sending such notice by telecopy (provided that the Company sends a
     confirming copy of such notice on the same day by overnight courier) of
     such Notice of Major Transaction. Such Notice of Major Transaction shall
     indicate the amount and type of the Major Transaction Consideration which
     such Holder would receive under clause (i) of this Section 8.3. If the
     Major Transaction Consideration which constitutes cash does not consist
     entirely of United States currency, such Holder may elect to receive United
     States currency in an amount equal to the value of the Major Transaction
     Consideration in lieu of the Major Transaction Consideration by delivering
     notice of such election to the Company within five (5) days of the Holder s
     receipt of the Notice of Major Transaction. As used in this Section 8.3, a
     "Change of Control" shall be deemed to have occurred at any time that the
     holders of Class B Common as of the date of the issuance of this Debenture
     no longer (x) have voting control of the Company s outstanding Common Stock
     or (y) have a material economic interest in the Company s equity.

          8.4 Adjustment Due to Distribution. If the Company shall declare or
     make any distribution of its assets (or rights to acquire its assets) to
     holders of Common Stock as a partial liquidating dividend, by way of return
     of capital or otherwise (including any dividend or distribution to the
     Company's shareholders in cash or shares (or rights to acquire shares) of
     capital stock of a subsidiary) (a "Distribution") at any time, then the
     Holder shall be entitled, upon any conversion of this Debenture after the
     date of record for determining shareholders entitled to such Distribution,
     to receive the amount of such assets (or rights) which would have been
     payable to the Holder had the Holder with respect to the shares of Common
     Stock issuable upon such conversion and the shares of Common Stock issuable
     upon exercise of the Warrants (in each case without regard to any
     limitations on conversion or exercise herein or elsewhere contained) been
     the holder of such shares of Common Stock on the record date for the
     determination of shareholders entitled to such Distribution.

          8.5 Issuance of Other Securities. If, at any time after the Closing
     Date the Company shall issue any securities which are convertible into or
     exchangeable for Common Stock ("Convertible Securities") either (i) at a
     conversion or exchange rate based on a discount from the market price of
     the Common Stock at the time of conversion or exercise or (ii) with a fixed
     conversion or exercise price less than the Variable Conversion Price, then,
     at the Holder's option: (x) in the case of clause (i), the Market
     Conversion Price, Variable Conversion Price and Green Floor Price in
     respect of any conversion of the Debentures after such issuance shall be
     calculated utilizing the greatest discount applicable to any such
     Convertible Securities; and (y) in the case of clause (ii), the Variable
     Conversion Price shall be reduced to such lesser conversion or exercise
     price and the Market Conversion Price and the Green Floor Price shall be
     proportionately reduced. If the Company shall issue any Convertible
     Securities that are convertible into or exchangeable for shares of Common
     Stock on a basis different from that of this Debenture, the Holder of this

<PAGE>



     Debenture may elect that the provisions to this Debenture be revised to
     incorporate such different provisions with respect to conversion or
     exchange, subject to the limitations of Section 3.7 hereof..

          8.6 Purchase Rights. If the Company issues any Convertible Securities
     or rights to purchase stock, warrants, securities or other property (the
     "Purchase Rights") pro rata to the record holders of any class of Common
     Stock, then the Holders will be entitled to acquire, upon the terms
     applicable to such Purchase Rights, the aggregate Purchase Rights which
     each Holder could have acquired if such Holder had held the number of
     shares of Common Stock acquirable upon complete conversion of this
     Debenture (without regard to any limitations on conversion or exercise
     herein or elsewhere contained) immediately before the date on which a
     record is taken for the grant, issuance or sale of such Purchase Rights,
     or, if no such record is taken, the date as of which the record holders of
     Common Stock are to be determined for the grants, issue or sale of such
     Purchase Rights.

          8.7 Special Adjustment. If the Company takes any actions other than by
     virtue of other provisions of this Article VII (excluding (i) issuance of
     shares in the ordinary course of business pursuant to employee stock option
     plans or employee stock purchase plans in effect on the date hereof, (ii)
     issuance of equity securities for consideration other than cash pursuant to
     a bona fide merger, consolidation, acquisition or similar business
     combination and issuance of convertible securities, options or rights in
     exchange for equivalent outstanding instruments of the other business
     combination party, and (iii) if the Market Conversion Price is then the
     applicable Conversion Price, the issuance of Common Stock at then market
     price) which would have a dilutive effect on the Holder or which would
     materially and adversely affect the Holder with respect to its investment
     in the Debenture, and if the provisions of this Article VIII are not
     strictly applicable to such actions or, if applicable to such actions,
     would not operate to equitably protect the Holder against such actions,
     then the Company shall promptly upon notice from a Holder appoint its
     independent certified public accountants to determine as promptly as
     practicable an appropriate adjustment to the terms hereof, including
     without limitation adjustments to the Variable Conversion Price, the Market
     Conversion Price and the Green Floor Price, or another appropriate action
     to so equitably protect such Holder and prevent any such dilution and any
     such material adverse effect, as the case may be. Following such
     determination, the Company shall forthwith make the adjustments or take the
     other actions described therein. In addition, in the event an adjustment
     would be required pursuant to Section 4(a) and 4(b) of the Warrant then a
     proportionate adjustment shall be made with respect to the Variable
     Conversion Price and the Green Floor Price hereunder.

          8.8 Notices of Adjustment. Upon the occurrence of each adjustment or
     readjustment pursuant to this Article VIII, the Company, at its expense,
     shall promptly compute such adjustment or readjustment and prepare and
     furnish to each Holder a certificate setting forth such adjustment or
     readjustment and showing in detail the facts upon which such adjustment or
     readjustment is based. The Company shall, upon the written request at any
     time of any Holder, furnish to such Holder a like certificate setting forth
     (i) such adjustment or readjustment, (ii) the Conversion Price at the time
     in effect and (iii) the number of shares of Common Stock and the amount, if
     any, of other securities or property which at the time would be received
     upon conversion of a Debenture.

          8.9 Delisting. In the event that the Common Stock of the Company is
     suspended from trading or is no longer listed (and authorized) for trading
     on The Nasdaq National Market or the New York Stock Exchange, the
     Conversion Price shall be reduced by ten (10%) percent of that amount
     calculated pursuant to Article II hereof and the Market Conversion Price
     shall be available for use by a Holder regardless of any other provision
     hereof. The Company shall also be required to pay to the Holders an amount
     (the "Delisting Amount") equal to the product of (i) 1.25 percent

<PAGE>



     times (ii) the outstanding principal amount of this Debenture on the date
     such suspension or delisting goes into effect plus all accrued and unpaid
     interest thereon. Such Delisting Amount shall be due and payable to the
     Holders for each monthly period that the Common Stock of the Company
     remains suspended from trading or is no longer listed (and authorized) as
     specified herein.

          8.10 If any Executive Officer or Director (as defined below), during
     the period beginning on the date of the Closing and ending on the date that
     is six (6) months after the registration statement required pursuant to
     Section 2.1 of the Registration Rights Agreement is declared effective, and
     while an officer or director, directly or indirectly, offers, sells,
     transfers, assigns, pledges, or otherwise disposes of any shares of Common
     Stock, or any securities directly or indirectly convertible into or
     exercisable or exchangeable for, or warrants, options or rights to purchase
     or acquire shares of Common Stock (all such securities,
      Options ) or enter into any agreement, contract, arrangement or
     understanding with respect to any such offer, sale, transfer, assignment,
     pledge or other disposition of any Common Stock or Options (an "Executive
     Transfer"), then the Conversion Price shall be reduced by twenty percent
     (20%) of that amount calculated pursuant to Article II hereof and the
     Market Conversion Price shall be available for use by a Holder regardless
     of any other provision hereof; provided, however that an Executive Officer
     or Director may sell up to ten percent (10%) of his or her total holdings,
     calculated as of the date of the Closing, during such six-month period
     without triggering the adjustments of this Section 8.10. For purposes of
     this Section 8.10, Executive Officer or Director shall mean Marc Zionts, J.
     William Nelson, Stephen J. Hawrysz, Richard P. Reviere, Marc Hafner,
     William Noll, John Seazholtz, Paul Dwyer, Ormand Wade, Melvin Simon, Robert
     C. Penney III and Robert Gaynor and any individual hired by the Company
     after the date of this Debenture to assume the duties of any of the
     foregoing individuals.

                                   ARTICLE IX
                           RANK; PROTECTION PROVISIONS

          9.1 Participation. Each Holder shall, as a Holder of a Debenture, be
     entitled to dividends paid and distributions made to the holders of Common
     Stock to the same extent as if such Holder had fully converted the
     Debenture held by such Holder on the record date for such dividends or
     distributions into Common Stock (without regard to any limitations on
     conversion herein or elsewhere contained) at the Conversion Price
     applicable on such record date and such Common Stock had been issued on the
     day before such record date. Payments under the preceding sentence shall be
     made concurrently with the dividend or distribution to the holders of
     Common Stock.

          9.2 Protection Provisions. The Company shall not, without first
     obtaining the approval of the Majority Holders and, to the extent their
     interests may be adversely affected, each initial Holder of Debentures: (i)
     alter or change the rights, preferences or privileges of any capital stock
     of the Company so as to affect adversely the Debentures; (ii) redeem, or
     declare or pay any cash dividend or distribution on, any securities of the
     Company ranking on liquidation junior to the Debentures; or (iii) do any
     act or thing not authorized or contemplated by this Debenture which would
     result in any taxation with respect to the Debentures under Section 305 of
     the Internal Revenue Code of 1986, as amended, or any comparable provision
     of the Internal Revenue Code as hereafter from time to time amended (or
     otherwise suffer to exist any taxation as a result thereof).

                                    ARTICLE X
                                  MISCELLANEOUS

          10.1 Allocation of Cap Amount and Reserved Amount. The initial Cap
     Amount and Reserve Amount shall be allocated pro rata among the Holders

<PAGE>



     based on the number of Debentures and Warrants held by each Holder. Each
     increase to the Cap Amount or Reserved Amount shall be allocated pro rata
     among the Holders based on the number of Debentures and Warrants held by
     each Holder at the time of increase in the Cap Amount or the Reserved
     Amount, as the case may be. In the event a Holder shall sell or otherwise
     transfer any of such Holder s Debentures or Warrants, each transferee shall
     be allocated a pro rata portion of such transferor s Cap Amount and
     Reserved Amount. Any portion of the Cap Amount or Reserved Amount which
     remains allocated to any person or entity which does not hold any
     Debentures or Warrants shall be allocated to the remaining Holders, pro
     rata based on the number of Debentures and Warrants then held by such
     Holders.

          10.2 Payment of Cash; Defaults. Whenever the Company is required to
     make any cash payment to a Holder under this Debenture (as a Conversion
     Default Payment, Holder Demand Redemption Amount or otherwise), such cash
     payment shall be made to the Holder by the method (by certified or
     cashier's check or wire transfer of immediately available funds) elected by
     such Holder. If such payment is not delivered when due (any such amount not
     paid when due being a Default Amount ) such Holder shall thereafter be
     entitled to interest on the unpaid amount at a per annum rate equal to the
     lower of fifteen percent (15%) or the highest interest rate permitted by
     applicable law until such amount is paid in full to the Holder. In
     addition, and notwithstanding anything to the contrary contained in this
     Debenture, a Holder may elect in writing to convert all or any portion of
     accrued Default Amounts, at any time and from time to time, into Common
     Stock at the lowest Conversion Price in effect during the period beginning
     on the date of the default with respect thereto through the cure date for
     such default. In the event that a Holder elects to convert all or any
     portion of the Default Amounts into Common Stock, the Holder shall so
     notify the Company on a Notice of Conversion of such portion of the Default
     Amounts which such Holder elects to so convert and such conversion shall be
     effected in accordance with the provisions of, and subject to limitations
     contained in, Article III hereof.

          10.3 Failure or Indulgence Not Waiver. No failure or delay on the part
     of a Holder in the exercise of any power, right or privilege hereunder
     shall operate as a waiver thereof, nor shall any single or partial exercise
     of any such power, right or privilege preclude other or further exercise
     thereof or of any other right, power or privilege.

          10.4 Notice. Any notice herein required or permitted to be given shall
     be in writing and may be personally served or delivered by courier or by
     confirmed telecopy and shall be deemed to have been given at the time and
     date of receipt (which shall include telephone line facsimile
     transmission). The addresses for such communications shall be:
                    If to the Company:

                    Westell Technologies, Inc.
                    750 N. Commons Drive
                    Aurora, IL 60504
                    Telecopy: (630) 375-4940
                    Attention: Stephen J. Hawrysz

                    with a copy to:

                    Neal J. White, P.C.
                    McDermott, Will & Emery
                    227 West Monroe Street
                    Chicago, IL 60606
                    Telecopy:  (312) 984-3669

                    If to Holder:

                    [INSERT]

<PAGE>



                    and with a copy to:

                    [INSERT]

          If to any other Holder, to such address set forth under Holder's name
     on the signature page of the Securities Purchase Agreement executed by such
     Holder.

          10.5 Amendment Provision. Except as provided in Section 3.7(b) hereof,
     this Debenture and any provision hereof may only be amended by an
     instrument in writing signed by the Company and the Majority Holders. The
     term "Debenture" and all references thereto, as used throughout this
     instrument, shall mean this instrument as originally executed, or if later
     amended or supplemented, then as so amended or supplemented.

          10.6 Assignability. This Debenture shall be binding upon the Company
     and its successors and assigns and shall inure to the benefit of each
     Holder and its successors and assigns. The Holder shall notify the Company
     upon the assignment of this Debenture.

          10.7 Cost of Collection. If default or failure is made in any manner
     with respect to this Debenture, the Company shall pay the Holder hereof
     costs of collection, including reasonable attorneys' fees.

          10.8 Governing Law. This Debenture shall be governed by and construed
     in accordance with the laws of the State of New York applicable to
     contracts made and to be performed in the State of New York. The Company
     irrevocably consents to the jurisdiction of the United States federal
     courts located in the State of New York in any suit or proceeding based on
     or arising under this Agreement and irrevocably agrees that all claims in
     respect of such suit or proceeding may be determined in such courts. The
     Company irrevocably waives the defense of an inconvenient forum to the
     maintenance of such suit or proceeding. The Company further agrees that
     service of process upon the Company, mailed by first class mail shall be
     deemed in every respect effective service of process upon the Company in
     any such suit or proceeding. Nothing herein shall affect each Holder's
     right to serve process in any other manner permitted by law. The Company
     agrees that a final non-appealable judgment in any such suit or proceeding
     shall be conclusive and may be enforced in other jurisdictions by suit on
     such judgment or in any other lawful manner.

          10.9 Denominations. At the request of a Holder, upon surrender of this
     Debenture, the Company shall promptly issue new Debentures in the aggregate
     outstanding principal amount hereof, in the form hereof, in such
     denominations as such Holder shall request.

          10.10 Lost or Stolen Debentures. Upon receipt by the Company of (i)
     evidence of the loss, theft, destruction or mutilation of this Debenture
     and (ii) (y) in the case of loss, theft or destruction, or an indemnity
     reasonably satisfactory to the Company, or (z) in the case of mutilation,
     upon surrender and cancellation of this Debenture, the Company shall
     execute and deliver new Debentures, in the form hereof, in such
     denominations as a Holder may request. However, the Company shall not be
     obligated to reissue such lost or stolen Debentures if such Holder
     contemporaneously requests the Company to convert this Debenture.

          10.11 Statements of Available Shares. Upon request, the Company shall
     deliver to a Holder a written report notifying such Holder of any
     occurrence which prohibits the Company from issuing Common Stock upon any
     such conversion. The report shall also specify (i) the total principal
     amount of all outstanding Debentures as of the date of the request, (ii)
     the total number or shares of Common Stock issued upon all conversions of
     Debentures through the date of the request, (iii) the total number of
     shares of Common Stock issued upon exercise of all Warrants through the
     date of the request, (iv) the total number of shares of Common Stock which
     are reserved for issuance upon conversion of Debentures and exercise of

<PAGE>



     Warrants as of the date of the request and (v) the total number of shares
     of Common Stock which may thereafter be issued by the Company upon
     conversion of Debentures and exercise of Warrants before the Company would
     exceed the Cap Amount and Reserved Amount. The Company shall, within five
     (5) days after delivery to the Company of a written request by any Holder,
     provide all of the information enumerated in clauses (i) - (v) of this
     Section 10.11 and, at the request of a Holder, make public disclosure
     thereof.

          10.12 Status as Debenture Holder. Upon submission of a Notice of
     Conversion by Holder, the principal amount of this Debenture and the
     interest thereon covered thereby shall be deemed converted into shares of
     Class A Common Stock and the Holder's rights as a Holder of such converted
     Debenture with respect thereto shall cease and terminate, excepting only
     the right to receive certificates for such shares of Class A Common Stock
     and to any remedies provided herein or otherwise available at law or in
     equity to Holder because of a failure by the Company to comply with the
     terms of this Debenture. Notwithstanding the foregoing, if Holder has not
     received certificates for all shares of Class A Common Stock prior to the
     tenth (10th) business day after the expiration of the Delivery Period with
     respect to a conversion for any reason, then (unless Holder otherwise
     elects to retain its status as a Holder of Class A Common Stock) the
     portion of the principal amount and interest thereon subject to such
     conversion shall be deemed outstanding under this Debenture, the Holder
     shall regain the rights of a holder of a Debenture with respect to such
     unconverted Debentures and the Company shall, as soon as practicable,
     return such unconverted Debentures to the Holder. In all cases, the Holder
     shall retain all of its rights and remedies (including, without limitation,
     (i) the right to receive Conversion Default Payments pursuant to Section
     6.1 hereof to the extent required thereby for such Conversion Default and
     any subsequent Conversion Default and (ii) the right with respect to
     conversions in accordance with Section 10.2 hereof, to the extent
     applicable) for the Company's failure to convert this Debenture.

          10.13 Ratable Payments. All payments and prepayments made by the
     Company with respect to the Debentures as to which more than one Holder
     shall be entitled shall be made ratably among all such Holders of
     Debentures in accordance with the principal amount of such Debentures.

          10.14 Remedies, Characterizations, Other Obligations, Breaches and
     Injunctive Relief. The remedies provided in this Debenture shall be
     cumulative and in addition to all other remedies available under this
     Debenture, at law or in equity (including a decree of specific performance
     and/or other injunctive relief), no remedy contained herein shall be deemed
     a waiver of compliance with the provisions giving rise to such remedy and
     nothing herein shall limit a Holder's right to actual damages for any
     failure by the Company to comply with the terms of this Debenture
     (including, without limitation, damages incurred to effect "cover" of
     shares of Common Stock anticipated to be received upon a conversion
     hereunder but not received in accordance with the terms hereof). The
     Company covenants to each Holder that there shall be no characterization
     concerning this instrument other than as expressly provided herein. Amounts
     set forth or provided for herein with respect to payments, conversion and
     the like (and the computation thereof) shall be the amounts to be received
     by the Holder hereof and shall not, except as expressly provided herein, be
     subject to any other obligation of the Company (or the performance
     thereof). The Company acknowledges that a breach by it of its obligations
     hereunder will cause irreparable harm to the holders of the Debentures and
     that the remedy at law for any such breach may be inadequate. The Company
     therefore agrees that, in the event of any such breach or threatened
     breach, the Holders shall be entitled, in addition to all other available
     remedies, to an injunction restraining any breach, without the necessity of
     showing economic loss and without any bond or other security being
     required.

          10.15     Specific   Shall  Not  Limit  General;  Construction.    No

<PAGE>



     specific provision contained in this Debenture shall limit or modify any
     more general provision contained herein. As used herein, the word
     "including" shall be deemed to mean "including, without limitation." This
     Debenture shall be deemed to be jointly drafted by the Company and all
     Holders and shall not be construed against any person as the drafter
     hereof.

                                        * * *


          IN WITNESS WHEREOF, Borrower has caused this Debenture to be signed in
     its name by its duly authorized officer as of the date first written above.


                                   WESTELL TECHNOLOGIES, INC.


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



                              NOTICE OF CONVERSION

     The undersigned hereby irrevocably elects to convert (the Conversion )
     $__________ principal amount of the Debenture plus all accrued and unpaid
     interest on such principal amount (i.e., $_________) plus all accrued and
     unpaid Conversion Default Payments relating thereto (if any) (each as
     defined in the Debenture dated ____________, 1999 (the "Debenture")), into
     shares of common stock ("Common Stock") of Westell Technologies, Inc. (the
     "Company") according to the conditions of the Debenture, as of the date
     written below. If securities are to be issued in the name of a person other
     than the undersigned, the undersigned will pay all transfer taxes payable
     with respect thereto. No fee will be charged to the Holder for any
     conversion except as provided herein.

     The undersigned represents and warrants that all offers and sales by the
     undersigned of the securities issuable to the undersigned upon conversion
     of this Debenture shall be made pursuant to registration of the Common
     Stock under the Securities Act of 1933, as amended (the "Act"), or pursuant
     to an exemption from registration under the Act.

     In the event of partial exercise, please reissue an appropriate
     Debenture(s) for the principal balance which shall not have been converted.

                                   Conversion Date:

                                   Applicable Conversion Price:

                                   Amount of Conversion Default Payments to be
                                   Converted, if any:

                                   Number of Shares of
                                   Class A Common Stock to be Issued:


                                   Signature:

                                      Name:

                                    Address:

<PAGE>



     ACKNOWLEDGED AND AGREED:

     WESTELL TECHNOLOGIES, INC.

     By:                                                                       
        -----------------------------

     --------------------------------
     Name:                                                                     

     --------------------------------
     Title:                                                              Date:

<PAGE>





                                                                  EXECUTION COPY



                          REGISTRATION RIGHTS AGREEMENT

          THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement"), is made as of
     April 15, 1999, by and among Westell Technologies, Inc., a Delaware
     corporation (the "Company"), with headquarters located at 750 N. Commons
     Drive, Aurora, Illinois 60504, and the undersigned (the "Initial
     Purchasers").

                                    RECITALS

          A. In connection with the Securities Purchase Agreement dated of even
     date herewith by and between the Company and the Initial Purchasers (the
     "Securities Purchase Agreement"), the Company has agreed, upon the terms
     and subject to the conditions contained therein, to issue and sell to the
     Initial Purchasers (i) an amount of the Company s 6% Subordinated
     Convertible Debentures (the "Debentures") in the form of Exhibit A which
     are convertible into shares of the Company's Class A Common Stock, par
     value $0.01 per share (the "Class A Common Stock" and, when taken together
     with all other classes and series of the Company's common stock, the
     "Common Stock"), (ii) warrants in the form of Exhibit B (each a "Warrant"
     and, when taken together with all of the warrants issued hereunder, the
     "Warrants")entitling the holder thereof to purchase the number of shares
     (the "Warrant Shares") of Class A Common Stock as set forth below. The
     Debentures, the PIK Debentures (as defined in the Debenture) and the Cap
     Debentures (as defined in the Debenture) are collectively referred to
     herein as the "Convertible Securities". The shares of Class A Common Stock
     issuable upon conversion of or otherwise pursuant to the Convertible
     Securities are referred to herein as the "Conversion Shares." The
     Convertible Securities, the Warrants, the Conversion Shares and the Warrant
     Shares are collectively referred to herein as the "Securities".

          B. To induce the Initial Purchasers to execute and deliver the
     Securities Purchase Agreement, the Company has agreed to provide certain
     registration rights under the Securities Act of 1933, as amended, and the
     rules and regulations thereunder, or any similar successor statute
     (collectively, the "Securities Act"), and applicable state securities laws.

                                   AGREEMENTS

          NOW THEREFORE, in consideration of the premises and the mutual
     covenants contained herein and other good and valuable consideration, the
     receipt and sufficiency of which are hereby acknowledged, the Company, and
     the Initial Purchasers hereby agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

          1.1 Definitions. As used in this Agreement, the following terms shall
     have the following meanings:

                    (a) "Purchasers" means the Initial Purchasers and any
     transferees or assignees who agree to become bound by the provisions of
     this Agreement in accordance with Article IX hereof.

                    (b) "register," "registered," and "registration" refer to a
     registration effected by preparing and filing a Registration Statement or
     Statements in compliance with the Securities Act and pursuant to Rule 415
     under the Securities Act or any successor rule providing for offering
     securities on a continuous basis ("Rule 415"), and the declaration or
     ordering of effectiveness of such Registration Statement by the United
     States Securities and Exchange Commission (the "SEC").

<PAGE>



                    (c) "Registrable Securities" means the Conversion Shares
     (including any Conversion Shares issuable with respect to payments under
     the Debentures) issued or issuable with respect to the Convertible
     Securities and the Warrant Shares issued or issuable with respect to the
     Warrants (without regard to any limitations on conversion or exercise) and
     any shares of capital stock issued or issuable, from time to time (with any
     adjustments), on or in exchange for or otherwise with respect to the Class
     A Common Stock or any other Registrable Securities.

                    (d) "Registration Statement" means a registration statement
     of the Company under the Securities Act pursuant to the provisions of this
     Agreement.

          1.2 Capitalized Terms. Capitalized terms used herein and not otherwise
     defined herein shall have the respective meanings set forth in the
     Securities Purchase Agreement.

                                   ARTICLE II
                                  REGISTRATION

          2.1 Mandatory Registration. (a) The Company shall prepare and file as
     soon as practicable but in any event on or prior to twenty (20) business
     days after the date of the Closing (a "Filing Date") with the SEC a
     Registration Statement on Form S-3 (or, if Form S-3 is not then available,
     on such form of Registration Statement as is then available to effect a
     registration of all of the Registrable Securities, subject to the consent
     of the Initial Purchasers (as determined pursuant to Section 11.10 hereof))
     but initially covering the resale of only 8,500,000 (subject to equitable
     adjustment for any stock splits, stock dividends, reclassification or
     similar events) shares of Class A Common Stock, including for purposes of
     this subsection (a) any PIK Debentures. The Registration Statement (and
     each amendment or supplement thereto, and each request for acceleration of
     effectiveness thereof) shall be provided to (and subject to the approval of
     (which approval shall not be unreasonably withheld or denied)) each Initial
     Purchaser and its counsel at least five (5) business days (or fewer to the
     extent provided herein) prior to its filing or other submission. The
     Company shall also prepare and file such amendments to registration
     statements and such additional registration statements as may from time to
     time be required by this Agreement.

          2.2  Underwritten Offering.  [Intentionally Deleted].

          2.3 Payments by the Company. The Company shall use its best efforts to
     cause each Registration Statement required to be filed pursuant to Section
     2.1 hereof to become effective as soon as practicable, but in no event
     later than the ninetieth (90th) day following the earlier of (a) the date
     that such Registration Statement was filed and (b) the applicable Filing
     Date (the "Registration Deadline"). If (i) a Registration Statement
     covering the Registrable Securities required to be filed by the Company
     pursuant to Section 2.1 hereof is not declared effective by the SEC on or
     before the applicable Registration Deadline (a "Registration Failure"), or
     (ii) except pursuant to a Permitted Blackout (as defined below) herein,
     after such Registration Statement has been declared effective by the SEC,
     sales of all the Registrable Securities covered thereby cannot be made
     pursuant to such Registration Statement (by reason of a stop order or the
     Company's failure to update the registration statement or any other reason
     outside the control of the Purchasers) (a "Registration Suspension"), then
     the Company will make payments to the Purchasers in such amounts and at
     such times as shall be determined pursuant to this Section 2.3 as partial
     relief for the damages to the Purchasers by reason of any such delay in or
     reduction of their ability to sell the Registrable Securities (which remedy
     shall not be exclusive of any other remedies available at law or in
     equity). In the event of a Registration Failure, the Company shall pay to
     the Purchasers an amount equal to (A) the Multiplier (as defined below)
     times (B) the Funded Amount (as defined below) times (C) the number of
     months (prorated per day for

<PAGE>



     partial months) following the applicable Registration Deadline prior to the
     date the applicable Registration Statement filed pursuant to Section 2.1 is
     declared effective by the SEC. In addition, in the event of a Registration
     Suspension, the Company shall pay to the Purchasers an amount equal to (D)
     the Multiplier times (E) the Funded Amount times (F) the number of months
     (prorated per day for partial months) from (x) the date on which sales of
     all the Registrable Securities first cannot be made to (y) the date on
     which sales of all such Registrable Securities can again be made. With
     respect to any given Registration Statement, the Funded Amount means the
     aggregate purchase price of the Convertible Securities and Warrants
     relating to the Common Stock registered (or to be registered) on such
     Registration Statement. Amounts to be paid pursuant to this Section 2.3
     shall be paid pro rata to Purchasers based upon the number of Conversion
     Shares and Warrant Shares owned by them (including, for these purposes,
     Conversion Shares issuable upon full conversion of the Convertible
     Securities and Warrant Shares issuable upon full exercise of the Warrants
     by each Purchaser, in each case without regard to any limitations upon
     exercise and conversion contained therein) and shall be paid in cash. Such
     payments shall be made within five (5) days after the end of each period
     that gives rise to such obligation, provided that, if any such period
     extends for more than thirty (30) days, payments shall be made for each
     such thirty (30) day period within five (5) days after the end of such
     thirty (30) day period. For purposes of this Section 2.3, the "Multiplier"
     is equal to (a) for the first month of a Registration Failure or a
     Registration Suspension, 0.01; (b) for the second month of a Registration
     Failure or a Registration Suspension, 0.015; (c) for the third and all
     successive months of a Registration Failure or a Registration Suspension,
     0.02. Notwithstanding the foregoing, a Registration Suspension effected by
     the Company pursuant to a Permitted Blackout shall not give rise to an
     obligation to make such payments. For purposes hereof, "Permitted Blackout"
     shall mean the suspension of the Registration Statement after the Effective
     Date upon the good faith determination by the Company's Board of Directors
     that a material financing, acquisition or other extraordinary corporate
     transaction is in the best interest of the Company and the holders of its
     outstanding Common Stock, and that disclosure thereof to the public would
     have a material adverse effect on the ability of the Company to consummate
     such material financing, acquisition or other extraordinary corporate
     transaction, all after receiving advice to such effect from a nationally
     recognized investment banking firm or, to the extent appropriate, the
     Company's counsel which has been engaged by the Company in connection with
     such financing, acquisition or other extraordinary corporate transaction;
     provided, however, that (i) no more than two (2) such Permitted Blackouts
     may be imposed during any period of twelve (12) consecutive months and (ii)
     the aggregate duration of all Permitted Blackouts during any period of
     twelve (12) consecutive months shall be no more than twenty (20) business
     days.

          2.4 Piggy-Back Registrations. If at any time prior to the expiration
     of the Registration Period (as hereinafter defined) the Company shall file
     with the SEC a Registration Statement relating to an offering for its own
     account or the account of others under the Securities Act of any of its
     equity securities (other than on Form S-4 or Form S-8 or their then
     equivalents relating to equity securities to be issued solely in connection
     with any acquisition of any entity or business or equity securities
     issuable in connection with stock option or other employee benefit plans),
     then the Company shall send to each Purchaser who has a right to have
     Registrable Securities covered by a Registration Statement pursuant to this
     Agreement written notice of such determination and, if within fifteen (15)
     days after the date of such notice, such Purchaser shall so request in
     writing, the Company shall include in such Registration Statement all or
     any part of the Registrable Securities such Purchaser requests to be
     registered, except that if, in connection with any underwritten public
     offering for the account of the Company the managing underwriter(s) thereof
     shall impose a limitation on the number of shares of Common Stock which may
     be included in the Registration Statement

<PAGE>



     because, in such underwriter(s)' judgment, marketing or other factors
     dictate such limitation is necessary to facilitate public distribution,
     then the Company shall be obligated to include in such Registration
     Statement only such limited portion of the Registrable Securities with
     respect to which such Purchaser has requested inclusion hereunder as the
     underwriter shall permit. Any exclusion of Registrable Securities shall be
     made pro rata among the Purchasers seeking to include Registrable
     Securities, in proportion to the number of Registrable Securities sought to
     be included by such Purchasers; provided, however, that the Company shall
     not exclude any Registrable Securities unless the Company has first
     excluded all outstanding securities, the holders of which are not entitled
     to inclusion of such securities in such Registration Statement or are not
     entitled to pro rata inclusion with the Registrable Securities; and
     provided, further, however, that, after giving effect to the immediately
     preceding proviso, any exclusion of Registrable Securities shall be made
     pro rata with holders of other securities having the right to include such
     securities in the Registration Statement. No right to registration of
     Registrable Securities under this Section 2.4 shall be construed to limit
     any registration required under Section 2.1 or 3.2 hereof. If an offering
     in connection with which a Purchaser is entitled to registration under this
     Section 2.4 is an underwritten offering, then each Purchaser whose
     Registrable Securities are included in such Registration Statement shall,
     unless otherwise agreed by the Company, offer and sell such Registrable
     Securities in an underwritten offering using the same underwriter or
     underwriters and, subject to the provisions of this Agreement, on the same
     terms and conditions as other shares of Common Stock included in such
     underwritten offering.

          2.5 Eligibility for Form S-3. The Company represents and warrants that
     it meets the requirements for the use of Form S-3 for registration of the
     re-sale by the Initial Purchasers and any other Purchaser of the
     Registrable Securities. The Company shall file all reports required to be
     filed by the Company with the SEC in a timely manner and take all other
     actions which may be required so as to maintain such eligibility for the
     use of Form S-3.

                                   ARTICLE III
                           OBLIGATIONS OF THE COMPANY

          In connection with the registration of the Registrable Securities, the
     Company shall have the following obligations, including with respect to
     each Registration Statement required to be filed hereunder:

          3.1 The Company shall prepare promptly and file with the SEC the
     Registration Statement required by Section 2.1, and cause such Registration
     Statement relating to Registrable Securities to become effective as soon as
     practicable after such filing, and keep the Registration Statement
     effective pursuant to Rule 415 and available for use at all times until
     such date as is the earlier of (i) the date on which all of the Registrable
     Securities have been sold (and no further Registrable Securities may be
     issued in the future) and (ii) the date on which all of the Registrable
     Securities (in the reasonable opinion of counsel to the Initial Purchasers)
     may be immediately sold to the public without registration and without
     restriction as to the number of Registrable Securities to be sold, whether
     pursuant to Rule 144 or otherwise (the "Registration Period"). The
     Registration Statement (including any amendments or supplements thereto and
     prospectuses contained therein and all documents incorporated by reference
     therein) shall not contain any untrue statement of a material fact or omit
     to state a material fact required to be stated therein, or necessary to
     make the statements therein not misleading.

          3.2 The Company shall prepare and file with the SEC such amendments
     (including post-effective amendments) and supplements to a Registration
     Statement and the prospectus used in connection with the Registration
     Statement as may be necessary to keep the Registration Statement effective

<PAGE>



     and available for use at all times during the Registration Period, and,
     during such period, comply with the provisions of the Securities Act with
     respect to the disposition of all Registrable Securities of the Company
     covered by the Registration Statement until the termination of the
     Registration Period or, if earlier, such time as all of such Registrable
     Securities have been disposed of in accordance with the intended methods of
     disposition by the seller or sellers thereof as set forth in the
     Registration Statement. In the event the number of shares available under a
     Registration Statement filed pursuant to this Agreement is, at any time,
     insufficient to cover one hundred seventy-five percent (175%) of the
     Registrable Securities issued or issuable upon conversion of the
     Convertible Securities or upon exercise of the Warrants (without giving
     effect to any limitations on conversion or exercise) held by any Purchaser
     and required to be covered by such Registration Statement pursuant to
     Section 2.1, the Company shall amend, if permissible, the Registration
     Statement, or file a new Registration Statement (on the short form
     available therefor, if applicable), or both, so as to cover two hundred
     percent (200%) of the Registrable Securities issued or issuable to such
     Purchaser upon such exercise or conversion (without giving effect to any
     limitations on conversion or exercise), in each case, as soon as
     practicable, but in any event within five (5) days. The Company shall cause
     such amendment and/or new Registration Statement to become effective as
     soon as practicable following the filing thereof.

          3.3 The Company shall furnish to each Purchaser whose Registrable
     Securities are included in the Registration Statement and its legal counsel
     (a) promptly after the same is prepared and publicly distributed, filed
     with the SEC, or received by the Company, one copy of the Registration
     Statement and any amendment thereto, each preliminary prospectus and
     prospectus and each amendment or supplement thereto, and, in the case of
     the Registration Statement referred to in Section 2.1, each letter written
     by or on behalf of the Company to the SEC or the staff of the SEC, and each
     item of correspondence from the SEC or the staff of the SEC, in each case
     relating to such Registration Statement (other than any portion, if any,
     thereof which contains information for which the Company has sought
     confidential treatment), and (b) such number of copies of a prospectus,
     including a preliminary prospectus, and all amendments and supplements
     thereto and such other documents as such Purchaser may reasonably request
     in order to facilitate the disposition of the Registrable Securities owned
     (or to be owned) by such Purchaser.

          3.4 The Company shall (a) register and qualify the Registrable
     Securities covered by the Registration Statement under securities laws of
     such jurisdictions in the United States as each Purchaser who holds (or has
     the right to hold) Registrable Securities being offered reasonably
     requests, (b) prepare and file in those jurisdictions such amendments
     (including post-effective amendments) and supplements to such registrations
     and qualifications as may be necessary to maintain the effectiveness
     thereof and availability for use during the Registration Period, (c) take
     such other actions as may be necessary to maintain such registrations and
     qualifications in effect at all times during the Registration Period, and
     (d) take all other actions reasonably necessary or advisable to qualify the
     Registrable Securities for sale in such jurisdictions; provided, however,
     that the Company shall not be required in connection therewith or as a
     condition thereto to (i) qualify to do business in any jurisdiction where
     it would not otherwise be required to qualify but for this Section 3.4,
     (ii) subject itself to general taxation in any such jurisdiction, (iii)
     file a general consent to service of process in any such jurisdiction, (iv)
     provide any undertakings that cause the Company material expense or burden,
     or (v) make any change in its charter or by-laws, which in each case the
     board of directors of the Company determines to be contrary to the best
     interests of the Company and its stockholders.

          3.5  [Intentionally Deleted].

<PAGE>



          3.6 As soon as practicable after becoming aware of such event, the
     Company shall notify (by telephone and also by facsimile and reputable
     overnight courier) each Purchaser of the happening of any event, of which
     the Company has knowledge, as a result of which the prospectus included in
     the Registration Statement, as then in effect, includes an untrue statement
     of a material fact or omission to state a material fact required to be
     stated therein or necessary to make the statements therein not misleading,
     and use its best efforts as soon as possible (but in any event within five
     (5) days) to prepare a supplement or amendment to the Registration
     Statement (and make all required filings with the SEC) to correct such
     untrue statement or omission, and the Company shall simultaneously (and
     thereafter as requested) deliver such number of copies of such supplement
     or amendment (or other applicable document) to each Purchaser as such
     Purchaser may request in writing.

          3.7 The Company shall use its best efforts to prevent the issuance of
     any stop order or other suspension of effectiveness of a Registration
     Statement, and, if such an order is issued, to obtain the withdrawal of
     such order at the earliest practicable time and the Company shall
     immediately notify by facsimile each Purchaser (at the facsimile number for
     such Purchaser set forth on the signature page hereto) who holds
     Registrable Securities being sold (or, in the event of an underwritten
     offering, the managing underwriters) of the issuance of such order and the
     resolution thereof.

          3.8 The Company shall permit a counsel designated by each Initial
     Purchaser to review the Registration Statement and all amendments and
     supplements thereto a reasonable period of time prior to their filing with
     the SEC, and not file any document in a form to which such counsel
     reasonably objects.

          3.9 The Company shall make generally available to its security holders
     as soon as practical, but not later than ninety (90) days after the close
     of the period covered thereby, an earnings statement (in form complying
     with the provisions of Rule 158 under the Securities Act) covering a
     twelve-month period beginning not later than the first day of the Company's
     fiscal quarter next following the effective date of the Registration
     Statement.

          3.10 [Intentionally Deleted].

          3.11 The Company shall make available for inspection by (i) any
     Purchaser and (ii) attorneys and accountants retained by any Purchaser
     (collectively, the "Inspectors") all pertinent financial and other records,
     and pertinent corporate documents and properties of the Company
     (collectively, the "Records"), as shall be reasonably deemed necessary by
     each Inspector and cause the Company's officers, directors and employees to
     supply all information which any Inspector may reasonably request;
     provided, however, that each Inspector shall hold in confidence and shall
     not make any disclosure (except to a Purchaser) of any Record or other
     information which the Company determines in good faith to be confidential,
     and of which determination the Inspectors are so notified in writing,
     unless (a) the disclosure of such Records is necessary to avoid or correct
     a misstatement or omission in any Registration Statement or is otherwise
     required to be disclosed in such Registration Statement to permit Purchaser
     to sell under such Registration Statement, (b) the release of such Records
     is ordered pursuant to a subpoena or other order from a court or government
     body of competent jurisdiction, or is otherwise required by applicable law
     or legal process or (c) the information in such Records has been made
     generally available to the public other than by disclosure in violation of
     this or any other agreement (to the knowledge of the relevant Purchaser).
     The Company shall not be required to disclose any confidential information
     in such Records to any Inspector until and unless such Inspector shall have
     entered into confidentiality agreements (in form and reasonable substance
     satisfactory to the Company) with the Company with respect thereto,
     substantially in the form of this Section 3.11.

<PAGE>



     Each Purchaser agrees that it shall, upon learning that disclosure of such
     Records is sought in or by a court or governmental body of competent
     jurisdiction or through other means, give prompt notice to the Company and
     allow the Company, at its expense, to undertake appropriate action to
     prevent disclosure of, or to obtain a protective order for, the Records
     deemed confidential. Nothing herein shall be deemed to limit a Purchaser's
     ability to sell Registrable Securities in a manner which is consistent with
     applicable laws and regulations.

          3.12 The Company shall hold in confidence and not make any disclosure
     of information concerning a Purchaser provided to the Company unless (a)
     disclosure of such information is necessary to comply with federal or state
     securities laws, (b) the disclosure of such information is necessary to
     avoid or correct a misstatement or omission in any Registration Statement,
     (c) the release of such information is ordered pursuant to a subpoena or
     other order from a court or governmental body of competent jurisdiction or
     is otherwise required by applicable law or legal process, (d) such
     information has been made generally available to the public other than by
     disclosure in violation of this or any other agreement (to the knowledge of
     the Company), or (e) such Purchaser consents to the form and content of any
     such disclosure. The Company agrees that it shall, upon learning that
     disclosure of such information concerning a Purchaser is sought in or by a
     court or governmental body of competent jurisdiction or through other
     means, give prompt notice to such Purchaser prior to making such
     disclosure, and allow the Purchaser, at its expense, to undertake
     appropriate action to prevent disclosure of, or to obtain a protective
     order for, such information.

          3.13 From and after each Closing, the Company shall cause the listing
     and the continuation of listing of all the Registrable Securities related
     to such Closing and required to be covered by a Registration Statement on
     The Nasdaq National Market or the New York Stock Exchange, and cause the
     Registrable Securities to be quoted or listed on each additional national
     securities exchange or quotation system upon which the Class A Common Stock
     is then listed or quoted.

          3.14 The Company shall provide a transfer agent and registrar, which
     may be a single entity, for the Registrable Securities not later than the
     effective date of the Registration Statement.

          3.15 The Company shall cooperate with the Purchasers who hold
     Registrable Securities being offered and the managing underwriter or
     underwriters, if any, to facilitate the timely preparation and delivery of
     certificates (not bearing any restrictive legends) representing Registrable
     Securities to be offered pursuant to the Registration Statement and enable
     such certificates to be in such denominations or amounts, as the case may
     be, as the managing underwriter or underwriters, if any, or the Purchasers
     may reasonably request and registered in such names as the managing
     underwriter or underwriters, if any, or the Purchasers may request, and,
     within two (2) business day after a Registration Statement which includes
     Registrable Securities is ordered effective by the SEC, the Company shall
     cause legal counsel selected by the Company to deliver, to the transfer
     agent for the Registrable Securities (with copies to the Purchasers whose
     Registrable Securities are included in such Registration Statement) an
     opinion of such counsel in the form attached hereto as Exhibit 1.

          3.16 At the request of any Purchaser, the Company shall promptly
     prepare and file with the SEC such amendments (including post-effective
     amendments) and supplements to a Registration Statement and the prospectus
     used in connection with the Registration Statement as may be necessary in
     order to change the plan of distribution set forth in such Registration
     Statement.

          3.17 The Company shall comply with all applicable laws related to a
     Registration Statement and offering and sale of securities covered by the

<PAGE>



     Registration Statement and all applicable rules and regulations of
     governmental authorities in connection therewith (including, without
     limitation, the Securities Act and the Securities Exchange Act of 1934, as
     amended, and the rules and regulations promulgated by the Commission).

          3.18 The Company shall take all such other actions as any Purchaser or
     the underwriters, if any, reasonably request in order to expedite or
     facilitate the disposition of such Registrable Securities.

          3.19 From and after the date of this Agreement, the Company shall not,
     and shall not agree to, allow the holders of any securities of the Company
     (other than Purchasers with respect to Registrable Securities) to include
     any of their securities in any Registration Statement or any amendment or
     supplement thereto under Section 2.1 or 3.2 hereof without the consent of
     the Initial Purchasers of a majority of the Registrable Securities.

          3.20 The Registration Statement shall state that it covers such
     indeterminate number of additional shares as may be issuable upon
     conversion of the Convertible Securities or exercise of the Warrants to
     prevent dilution resulting from stock splits, stock dividends and other
     similar transactions.

                                   ARTICLE IV
                          OBLIGATIONS OF THE PURCHASERS

          In connection with the registration of the Registrable Securities,
     each Purchaser shall have the following obligations:

          4.1 Purchaser shall furnish to the Company such information regarding
     itself, the Registrable Securities held by it and the intended method of
     disposition of the Registrable Securities held by it as shall be required
     to effect the registration of such Registrable Securities. At least five
     (5) business days prior to the first anticipated filing date of the
     Registration Statement, the Company shall notify each Purchaser of the
     information the Company requires from each such Purchaser.

          4.2 Each Purchaser, by such Purchaser's acceptance of the Registrable
     Securities, agrees to cooperate with the Company as reasonably requested by
     the Company in connection with the preparation and filing of the
     Registration Statements hereunder, unless such Purchaser has notified the
     Company in writing of such Purchaser's election to exclude all of such
     Purchaser's Registrable Securities from the Registration Statement.

          4.3 Each Purchaser whose Registrable Securities are included in a
     Registration Statement understands that the Securities Act may require
     delivery of a prospectus relating thereto in connection with any sale
     thereof pursuant to such Registration Statement, and each such Purchaser
     shall use its reasonable efforts to comply with the applicable prospectus
     delivery requirements of the Securities Act in connection with any such
     sale.

          4.4  [Intentionally Deleted].

          4.5 Each Purchaser agrees that, upon receipt of written notice from
     the Company of the happening of any event of the kind described in Section
     3.6, such Purchaser will immediately discontinue disposition of Registrable
     Securities pursuant to the Registration Statement covering such Registrable
     Securities until such Purchaser's receipt of the copies of the supplemented
     or amended prospectus contemplated by Section 3.6 or advice that a
     supplement or amendment is not required and, if so directed by the Company,
     such Purchaser shall deliver to the Company (at the expense of the Company)
     or destroy (and deliver to the Company a certificate of destruction) all
     copies in such Purchaser's possession (other than a limited number of
     permanent file copies), of the prospectus covering such Registrable
     Securities current at the time of receipt of

<PAGE>



     such notice. Purchaser's obligations under this paragraph shall in no way
     limit the Company's obligations under this Agreement or Purchaser's rights
     or remedies against the Company with respect to any breach or threatened
     breach by the Company of any such obligations.

          4.6  [Intentionally Deleted].

                                    ARTICLE V
                            EXPENSES OF REGISTRATION

          All expenses, other than underwriting discounts and commissions,
     incurred in connection with registrations, filings or qualifications
     pursuant to Articles II and III, including, without limitation, all
     registration, listing and qualification fees, printers and accounting fees,
     the fees and disbursements of counsel for the Company, and the reasonable
     fees and disbursements of Inspectors selected by the Purchasers pursuant to
     Section 3.11, hereof shall be borne by the Company; provided, however that
     the Company shall be required to bear the reasonable fees and disbursements
     of such Inspectors only if reasonably requested by a Purchaser in writing
     (taking into account any applicable legal precedent and any SEC staff
     positions) and consented to by the Company after consultation with its
     counsel (which consent will not be unreasonably withheld based upon all
     relevant facts and circumstances and taking into account the advice of such
     counsel).

                                   ARTICLE VI
                                 INDEMNIFICATION

          In the event any Registrable Securities are included in a Registration
     Statement under this Agreement:

          6.1 To the extent permitted by law, the Company will indemnify, hold
     harmless and defend (a) each Purchaser who holds such Registrable
     Securities, (b) each underwriter of Registrable Securities and (c) the
     directors, officers, partners, members, employees, agents and persons who
     control any Purchaser within the meaning of Section 15 of the Securities
     Act or Section 20 of the Securities Exchange Act of 1934, as amended (the
     "Exchange Act"), if any, (each, an "Indemnified Person"), against any
     losses, claims, damages, liabilities or expenses (collectively, together
     with actions, proceedings or inquiries whether or not in any court, before
     any administrative body or by any regulatory or self-regulatory
     organization, whether commenced or threatened, in respect thereof,
     "Claims") to which any of them may become subject insofar as such Claims
     arise out of or are based upon: (i) any untrue statement or alleged untrue
     statement of a material fact in a Registration Statement or the omission or
     alleged omission to state therein a material fact required to be stated or
     necessary to make the statements therein not misleading, (ii) any untrue
     statement or alleged untrue statement of a material fact contained in any
     preliminary prospectus if used prior to the effective date of such
     Registration Statement, or contained in the final prospectus (as amended or
     supplemented, if the Company files any amendment thereof or supplement
     thereto with the SEC) or the omission or alleged omission to state therein
     any material fact necessary to make the statements made therein, in light
     of the circumstances under which the statements therein were made, not
     misleading, or (iii) any violation or alleged violation by the Company of
     the Securities Act, the Exchange Act, any other law, including, without
     limitation, any state securities law, or any rule or regulation thereunder
     relating to the offer or sale of the Registrable Securities (the matters in
     the foregoing clauses (i) through (iii) being, collectively, "Violations").
     The Company shall reimburse each such Indemnified Person, promptly as such
     expenses are incurred and are due and payable, for any reasonable legal
     fees or other reasonable expenses incurred by them in connection with
     investigating or defending any such Claim. Notwithstanding anything to the
     contrary contained herein, the indemnification agreement contained in this
     Section 6.1: (x) shall not apply to an Indemnified Person with respect to a
     Claim arising out of or

<PAGE>



     based upon a Violation which occurs in reliance upon and in conformity with
     information furnished in writing to the Company by such Indemnified Person
     expressly for use in the Registration Statement or any such amendment
     thereof or supplement thereto; (y) shall not apply to amounts paid in
     settlement of any Claim if such settlement is effected without the prior
     written consent of the Company, which consent shall not be unreasonably
     withheld; and (z) with respect to any preliminary prospectus, shall not
     inure to the benefit of any Indemnified Person if the untrue statement or
     omission of material fact contained in the preliminary prospectus was
     corrected on a timely basis in the prospectus, as then amended or
     supplemented, if such corrected prospectus was timely made available by the
     Company pursuant to Section 3.3 hereof, and the Indemnified Person was
     promptly advised in writing not to use the incorrect prospectus prior to
     the use giving rise to a Violation and such Indemnified Person,
     notwithstanding such advice, used it. Such indemnity shall remain in full
     force and effect regardless of any investigation made by or on behalf of
     the Indemnified Person and shall survive the transfer of the Registrable
     Securities by a Purchaser pursuant to Article IX.

          6.2 In connection with any Registration Statement in which a Purchaser
     is participating, each such Purchaser agrees to indemnify, hold harmless
     and defend, to the same extent and in the same manner set forth in Section
     6.1, the Company, each of its directors, each of its officers who signs the
     Registration Statement, its employees, agents and persons, if any, who
     control the Company within the meaning of Section 15 of the Securities Act
     or Section 20 of the Exchange Act, and any other stockholder selling
     securities pursuant to the Registration Statement, together with its
     directors, officers and members, and any person who controls such
     stockholder or underwriter within the meaning of the Securities Act or the
     Exchange Act (such an "Indemnified Party"), against any Claim to which any
     of them may become subject, under the Securities Act, the Exchange Act or
     otherwise, insofar as such Claim arises out of or is based upon any
     Violation, in each case to the extent (and only to the extent) that such
     Violation occurs in reliance upon and in conformity with written
     information furnished to the Company by such Purchaser expressly for use in
     connection with such Registration Statement; and such Purchaser will
     reimburse any legal or other expenses (promptly as such expenses are
     incurred and are due and payable) reasonably incurred by them in connection
     with investigating or defending any such Claim; provided, however, that the
     indemnity agreement contained in this Section 6.2 shall not apply to
     amounts paid in settlement of any Claim if such settlement is effected
     without the prior written consent of such Purchaser, which consent shall
     not be unreasonably withheld; provided, further, however, that a Purchaser
     shall be liable under this Agreement (including this Section 6.2 and
     Article VII) for only that amount as does not exceed the net proceeds
     actually received by such Purchaser as a result of the sale of Registrable
     Securities pursuant to such Registration Statement. Such indemnity shall
     remain in full force and effect regardless of any investigation made by or
     on behalf of such Indemnified Party and shall survive the transfer of the
     Registrable Securities by a Purchaser pursuant to Article IX.
     Notwithstanding anything to the contrary contained herein, the
     indemnification agreement contained in this Section 6.2 with respect to any
     preliminary prospectus shall not inure to the benefit of any Indemnified
     Party if the untrue statement or omission of material fact contained in the
     preliminary prospectus was corrected on a timely basis in the prospectus,
     as then amended or supplemented, and the Indemnified Party failed to
     utilize such corrected prospectus.

          6.3 Promptly after receipt by an Indemnified Person or Indemnified
     Party under this Article VI of notice of the commencement of any action
     (including any governmental action), such Indemnified Person or Indemnified
     Party shall, if a Claim in respect thereof is to be made against any
     indemnifying party under this Article VI, deliver to the indemnifying party
     a written notice of the commencement thereof, and the indemnifying party
     shall have the right to participate in, and, to the extent the indemnifying
     party so desires, jointly with any other

<PAGE>



     indemnifying party similarly noticed, to assume control of the defense
     thereof with counsel mutually satisfactory to the indemnifying party and
     the Indemnified Person or the Indemnified Party, as the case may be;
     provided, however, that such indemnifying party shall diligently pursue
     such defense and that such indemnifying party shall not be entitled to
     assume such defense and an Indemnified Person or Indemnified Party shall
     have the right to retain its own counsel with the fees and expenses to be
     paid by the indemnifying party, if the representation by such counsel of
     the Indemnified Person or Indemnified Party and the indemnifying party
     would be inappropriate due to actual or potential conflicts of interest
     between such Indemnified Person or Indemnified Party and any other party
     represented by such counsel in such proceeding or the actual or potential
     defendants in, or targets of, any such action include both the Indemnified
     Person or the Indemnified Party and any such Indemnified Person or
     Indemnified Party reasonably determines that there may be legal defenses
     available to such Indemnified Person or Indemnified Party which are
     different from or in addition to those available to such indemnifying
     party. The indemnifying party shall pay for only one separate legal counsel
     for the Indemnified Persons or the Indemnified Parties, as applicable, and
     such legal counsel shall be selected by Purchasers holding a
     majority-in-interest of the Registrable Securities included in the
     Registration Statement to which the Claim relates (with the approval of the
     Initial Purchasers if they hold Registrable Securities included in such
     Registration Statement), if the Purchasers are entitled to indemnification
     hereunder, or by the Company, if the Company is entitled to indemnification
     hereunder, as applicable. The failure to deliver written notice to the
     indemnifying party within a reasonable time of the commencement of any such
     action shall not relieve such indemnifying party of any liability to the
     Indemnified Person or Indemnified Party under this Article VI, except to
     the extent that the indemnifying party is actually prejudiced in its
     ability to defend such action. The indemnification required by this Article
     VI shall be made by periodic payments of the amount thereof during the
     course of the investigation or defense, as such expense, loss, damage or
     liability is incurred and is due and payable.

                                   ARTICLE VII
                                  CONTRIBUTION

          To the extent any indemnification by an indemnifying party is
     prohibited or limited by law, the indemnifying party agrees to make the
     maximum contribution with respect to any amounts for which it would
     otherwise be liable under Article VI to the fullest extent permitted by
     law; provided, however, that (i) no person guilty of fraudulent
     misrepresentation (within the meaning of Section 11(f) of the Securities
     Act) shall be entitled to contribution from any person of Registrable
     Securities who was not guilty of such fraudulent misrepresentation, and
     (ii) contribution (together with any indemnification or other obligations
     under this Agreement) by any seller of Registrable Securities shall be
     limited in amount to the net amount of proceeds received by such seller
     from the sale of such Registrable Securities.

                                  ARTICLE VIII
                         REPORTS UNDER THE EXCHANGE ACT

          With a view to making available to the Purchasers the benefits of Rule
     144 promulgated under the Securities Act or any other similar rule or
     regulation of the SEC that may at any time permit the Purchasers to sell
     securities of the Company to the public without registration ("Rule 144"),
     the Company agrees to:

          8.1 File with the SEC in a timely manner and make and keep available
     all reports and other documents required of the Company under the
     Securities Act and the Exchange Act so long as the Company remains subject
     to such requirements (it being understood that nothing herein shall limit
     the Company's obligations under Section 4.3 of the Securities Purchase
     Agreement) and the filing and availability of such reports and other

<PAGE>



     documents is required for the applicable provisions of Rule 144; and

          8.2 Furnish to each Purchaser so long as such Purchaser holds
     Convertible Securities, Warrants or Registrable Securities, promptly upon
     request, (i) a written statement by the Company that it has complied with
     the reporting requirements of Rule 144, the Securities Act and the Exchange
     Act, (ii) a copy of the most recent annual or quarterly report of the
     Company and such other reports and documents so filed by the Company, and
     (iii) such other information as may be reasonably requested to permit the
     Purchasers to sell such securities pursuant to Rule 144 without
     registration.

                                   ARTICLE IX
                        ASSIGNMENT OF REGISTRATION RIGHTS

          The rights of the Purchasers hereunder, including the right to have
     the Company register Registrable Securities pursuant to this Agreement,
     shall be automatically assigned by each Purchaser to any transferee of all
     or any portion of the Convertible Securities or the Registrable Securities
     if: (a) the Purchaser agrees in writing with the transferee or assignee to
     assign such rights, and a copy of such agreement is furnished to the
     Company within a reasonable time after such assignment, (b) the Company is,
     within a reasonable time after such transfer or assignment, furnished with
     written notice of (i) the name and address of such transferee or assignee,
     and (ii) the securities with respect to which such registration rights are
     being transferred or assigned, (c) following such transfer or assignment,
     the further disposition of such securities by the transferee or assignee is
     restricted under the Securities Act or applicable state securities laws,
     and (d) at or before the time the Company receives the written notice
     contemplated by clause (ii) of this sentence, the transferee or assignee
     agrees in writing for the benefit of the Company to be bound by all of the
     provisions contained herein. The rights of a Purchaser hereunder with
     respect to any Registrable Securities not transferred (and not represented
     by Convertible Securities or Warrants transferred) shall not be assigned by
     virtue of the transfer of other Registrable Securities or transferred
     Convertible Securities or Warrants representing other Registrable
     Securities.

                                    ARTICLE X
                        AMENDMENT OF REGISTRATION RIGHTS

          Provisions of this Agreement may be amended and the observance thereof
     may be waived (either generally or in a particular instance and either
     retroactively or prospectively), only with written consent of the Company,
     the Initial Purchasers (but not an Initial Purchaser who no longer owns any
     Convertible Securities or Registrable Securities and who is not affected by
     such amendment or waiver) and Purchasers who hold a majority interest of
     the Registrable Securities. Any amendment or waiver effected in accordance
     with this Article X shall be binding upon each Purchaser and the Company.
     Notwithstanding the foregoing, no amendment or waiver shall retroactively
     affect any Purchaser without its comment or prospectively adversely affect
     any Purchaser who no longer owns any Convertible Securities, Warrants or
     Registrable Securities without its consent. No amendment or waiver may
     adversely affect one or more Purchasers or group of Purchasers vis-a-vis
     any other Purchaser or group of Purchasers. Neither Article VI nor Article
     VII hereof may be amended or waived in a manner adverse to a Purchaser
     without its consent. Notwithstanding anything to the contrary contained in
     this Article X, no amendment or waiver shall be applicable to an Initial
     Purchaser who does not consent in writing thereto.

                                   ARTICLE XI
                                  MISCELLANEOUS

          11.1 A person or entity is deemed to be a holder (or a holder in
     interest) of Registrable Securities whenever such person or entity owns of

<PAGE>



     record such Registrable Securities (or the Convertible Securities or
     Warrants which may be converted into or exercised for Registrable
     Securities). If the Company receives conflicting instructions, notices or
     elections from two or more persons or entities with respect to the same
     Registrable Securities, the Company shall act upon the basis of
     instructions, notice or election received from the registered owner of such
     Registrable Securities (or Convertible Securities or Warrants, as the case
     may be).

          11.2 Any notices herein required or permitted to be given shall be in
     writing and may be personally served or delivered by courier or by
     machine-generated confirmed telecopy, and shall be deemed delivered at the
     time and date of receipt (which shall include telephone line facsimile
     transmission). The addresses for such communications shall be:

               If to the Company:

                    Westell Technologies, Inc.
                    750 N. Commons Drive
                    Aurora, IL 60504
                    Telecopy: (630) 375-4940
                    Attention: Stephen J. Hawrysz

               with a copy to:

                    Neal J. White, P.C.
                    McDermott, Will & Emery
                    227 West Monroe Street
                    Chicago, IL 60606
                    Telecopy:  (312) 984-3669      
                    Attention:  (312) 984-7579    

     if to any Purchaser, at such address as such Purchaser, shall have provided
     in writing to the Company, or at such other address as each such party
     furnishes by notice given in accordance with this Section 11.2.

          11.3 Failure of any party to exercise any right or remedy under this
     Agreement or otherwise, or delay by a party in exercising such right or
     remedy, shall not operate as a waiver thereof.

          11.4 This Agreement shall be governed by and construed in accordance
     with the laws of the State of New York applicable to contracts made and to
     be performed in the State of New York. The Company irrevocably consents to
     the jurisdiction of the federal courts located in the State of New York and
     the state courts of the State of New York located in the County of New York
     in the State of New York in any suit or proceeding based on or arising
     under this Agreement and irrevocably agrees that all claims in respect of
     such suit or proceeding may be determined in such courts. The Company
     irrevocably waives the defense of an inconvenient forum to the maintenance
     of such suit or proceeding. The parties hereto further agree that service
     of process upon the parties hereto mailed by first class mail shall be
     deemed in every respect effective service of process upon each such party
     in any such suit or proceeding. Nothing herein shall affect either party's
     right to serve process in any other manner permitted by law. The parties
     hereto agree that a final non-appealable judgment in any such suit or
     proceeding shall be conclusive and may be enforced in other jurisdictions
     by suit on such judgment or in any other lawful manner.

          11.5 This Agreement, the Convertible Securities, Warrants and the
     Securities Purchase Agreement (including all schedules and exhibits thereto
     and all certificates and opinions required thereby) constitute the entire
     agreement among the parties hereto with respect to the subject matter
     hereof and thereof. There are no restrictions, promises, warranties or
     undertakings, other than those set forth or referred to herein and therein.
     This Agreement, the Convertible Securities, the Warrants and the Securities
     Purchase Agreement supersede all prior

<PAGE>



     agreements and understandings among the parties hereto with respect to the
     subject matter hereof and thereof.

          11.6 Subject to the requirements of Article IX hereof, this Agreement
     shall inure to the benefit of and be binding upon the successors and
     assigns of each of the parties hereto. Notwithstanding anything to the
     contrary contained herein, including, without limitation, Article IX, the
     rights of a Purchaser hereunder shall be assignable to and exercisable by a
     bona fide pledgee of the Registrable Securities in connection with a
     Purchaser s margin or brokerage accounts.

          11.7 The headings in this Agreement are for convenience of reference
     only and shall not limit or otherwise affect the meaning hereof.

          11.8 This Agreement may be executed in two or more counterparts, each
     of which shall be deemed an original but all of which shall constitute one
     and the same agreement. This Agreement, once executed by a party, may be
     delivered to the other party hereto, by facsimile transmission of a copy of
     this Agreement bearing the signature of the party so delivering this
     Agreement.

          11.9 Each party shall do and perform, or cause to be done and
     performed, all such further acts and things, and shall execute and deliver
     all such other agreements, certificates, instruments and documents, as the
     other party may reasonably request in order to carry out the intent and
     accomplish the purposes of this Agreement and the consummation of the
     transactions contemplated hereby.

          11.10     [Intentionally Deleted].

          11.11 The initial number of Registrable Securities included on any
     Registration Statement shall be allocated pro rata among the Purchasers
     based upon the number of Registrable Securities held by each Purchaser at
     the time of establishment of such number. In the event a Purchaser shall
     sell or otherwise transfer any of such holder's Registrable Securities,
     each transferee shall be allocated a pro rata portion of the number of
     Registrable Securities included on a Registration Statement for such
     transferor. Any shares of Common Stock included on a Registration Statement
     and which remain allocated to any person or entity which does not hold any
     Registrable Securities shall be allocated to the remaining Purchasers, pro
     rata based on the number of shares of Registrable Securities then held by
     such Purchasers. Without implication that the contrary would otherwise be
     true, for purposes of this paragraph, all Convertible Securities and
     Warrants then outstanding shall be assumed converted into and exercised for
     Registrable Securities (without giving effect to any limitations on
     conversion or exercise).

          11.12 If any provision of this Agreement shall be invalid or
     unenforceable, such invalidity or unenforceability shall not affect the
     validity or enforceability of the remainder of this Agreement.

          IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
     executed as of the date first above written.


     WESTELL TECHNOLOGIES, INC.


     By:
        Name: 
        Title: 

     Address:

     Facsimile Number:

<PAGE>



     INITIAL PURCHASERS:

     CASTLE CREEK TECHNOLOGY PARTNERS LLC

          By:  CASTLE CREEK PARTNERS LLC
          Its: Investment Manager

          By:  ___________________________________
          Name:     John D. Ziegelman
          Title:    Managing Member

          Address:
               77 W. Wacker Drive, Suite 4040
               Chicago, IL 60601
          Facsimile Number:
               (312) 499-6999


     MARSHALL CAPITAL MANAGEMENT, INC.

          By:  ___________________________________
          Name:
          Title:

          Address:
          Facsimile Number:


     CAPITAL VENTURES INTERNATIONAL

          By:  ___________________________________
          Name:
          Title:

          Address:
          Facsimile Number:


                                                                       EXHIBIT 1
                                                                 TO REGISTRATION
                                                                RIGHTS AGREEMENT
                                     [Date]
     [Name and address
     of transfer agent]

                    RE: WESTELL TECHNOLOGIES, INC.

     Ladies and Gentlemen:

          We are counsel to Westell Technologies, Inc., a Delaware corporation
     (the "Company"), and we understand that [Name of Purchaser] (the "Holder")
     has purchased from the Company an amount of the Company s 6% Subordinated
     Convertible Debentures (the "Debentures") convertible into shares of the
     Company's Class A common stock, par value $0.01 per share (the "Common
     Stock"). The Debentures were purchased by the Holder pursuant to a
     Securities Purchase Agreement, dated as of April 14, 1999, by and among the
     Company and the signatories thereto (the "Agreement"). Pursuant to a
     Registration Rights Agreement, dated as of April 15, 1999, by and among the
     Company and the signatories thereto (the "Registration Rights Agreement"),
     the Company agreed with the Holder, among other things, to register the
     Registrable Securities (as that term is defined in the Registration Rights
     Agreement) under the Securities Act of 1933, as amended (the "Securities
     Act"), upon the terms provided in the Registration Rights Agreement. In
     connection with the Company's obligations under the Registration Rights
     Agreement, on April __, 1999, the Company filed a Registration Statement on
     Form S-_____ (File No. 333-

<PAGE>



     __________) (the "Registration Statement") with the Securities and Exchange
     Commission (the "SEC") relating to the Registrable Securities, which names
     the Holder as a selling stockholder thereunder.

          [Other customary introductory and scope of examination language to be
     inserted]

          Based on the foregoing, we are of the opinion that the Registrable
     Securities have been registered under the Securities Act.

               [Other appropriate customary language to be included.]

                                        Very truly yours,

     cc:  [Name of Purchaser]

<PAGE>









     EXHIBIT B
     to Securities Purchase Agreement

     VOID AFTER 5:00 P.M., CENTRAL STANDARD
     TIME ON APRIL 15, 2004


     THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
     UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY
     STATE OF THE UNITED STATES. THE SECURITIES REPRESENTED HEREBY MAY NOT BE
     OFFERED OR SOLD OR OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE
     REGISTRATION STATEMENT FOR THE SECURITIES UNDER APPLICABLE SECURITIES LAWS,
     OR UNLESS OFFERED, SOLD OR TRANSFERRED PURSUANT TO AN AVAILABLE EXEMPTION
     FROM THE REGISTRATION REQUIREMENTS OF THOSE LAWS.

                                               Right to Purchase ____ Shares of
                                Class A Common Stock, par value $0.01 per share

     Date: April 15, 1999

                           WESTELL TECHNOLOGIES, INC.
                             STOCK PURCHASE WARRANT


          THIS CERTIFIES THAT, for value received, or its registered assigns, is
     entitled to purchase from Westell Technologies, Inc., a Delaware
     corporation (the "Company"), at any time or from time to time during the
     period specified in Section 2 hereof, fully paid and nonassessable shares
     of the Company's Class A Common Stock, par value $0.01 per share (the
     "Class A Common Stock" and, when taken together with all other classes and
     series of the common stock of the Company, the "Common Stock"), at an
     exercise price of $8.9208 per share (the "Exercise Price"). This Warrant is
     being issued pursuant to that certain Securities Purchase Agreement dated
     April 14, 1999 among the Company and the signatories thereto (the
     "Securities Purchase Agreement"). The number of shares of Class A Common
     Stock purchasable hereunder (the "Warrant Shares") and the Exercise Price
     are subject to adjustment as provided in Section 4 hereof. The term
     "Warrants" means this Warrant and the other warrants of the Company issued
     pursuant to the terms of the Securities Purchase Agreement.

          The term "Closing Sale Price" means, for any security as of any date,
     the closing sale price of such security on the principal securities
     exchange or trading market where such security is listed or traded as
     reported by Bloomberg Financial Markets or a comparable reporting service
     of national reputation selected by the Company and reasonably acceptable to
     the holder hereof (the "Holder") if Bloomberg Financial Markets is not then
     reporting closing sale prices of such security (collectively, "Bloomberg"),
     or if the foregoing does not apply, the last reported sale price of such
     security in the over-the-counter market on the electronic bulletin board of
     such security as reported by Bloomberg, or, if no sale price is reported
     for such security by Bloomberg, the average of the bid prices of any market
     makers for such security as reported in the "pink sheets" by the National
     Quotation Bureau, Inc. If the Closing Sale Price cannot be calculated for
     such security on such date on any of the foregoing bases, the Closing Sale
     Price of such security on such date shall be the fair market value as
     reasonably determined by an investment banking firm selected by the Company
     and reasonably acceptable to the Holder with the costs of such appraisal to
     be borne by the Company.

          This Warrant is subject to the following terms, provisions, and
     conditions:

<PAGE>



          1. Mechanics of Exercise. Subject to the provisions hereof, including,
     without limitation, the limitations contained in Section 8(f) hereof, this
     Warrant may be exercised as follows:

          (a) Manner of Exercise. This Warrant may be exercised by the Holder,
     in whole or in part, by the surrender of this Warrant (or evidence of loss,
     theft, destruction or mutilation thereof in accordance with Section 8(c)
     hereof), together with a completed exercise agreement in the Form of
     Exercise Agreement attached hereto as Exhibit 1 (the "Exercise Agreement"),
     to the Company at the Company's principal executive offices (or such other
     office or agency of the Company as it may designate by notice to the
     Holder), and upon (i) payment to the Company in cash, by certified or
     official bank check or by wire transfer for the account of the Company, of
     the Exercise Price for the Warrant Shares specified in the Exercise
     Agreement or (ii) if the Holder elects to effect a Cashless Exercise (as
     defined in Section 12(c) below), delivery to the Company of a written
     notice of an election to effect a Cashless Exercise for the Warrant Shares
     specified in the Exercise Agreement. The Warrant Shares so purchased shall
     be deemed to be issued to the Holder or Holder's designees, as the record
     owner of such shares, as of the date on which this Warrant shall have been
     surrendered, the completed Exercise Agreement shall have been delivered,
     and payment (or notice of an election to effect a Cashless Exercise) shall
     have been made for such shares as set forth above.

          (b) Issuance of Certificates. Subject to Section 1(c), certificates
     for the Warrant Shares so purchased, representing the aggregate number of
     shares specified in the Exercise Agreement, shall be delivered to the
     Holder within a reasonable time, not exceeding three (3) business days,
     after this Warrant shall have been so exercised (the "Delivery Period").
     The certificates so delivered shall be in such denominations as may be
     requested by the Holder and shall be registered in the name of Holder or
     such other name as shall be designated by such Holder. If this Warrant
     shall have been exercised only in part, then, unless this Warrant has
     expired, the Company shall, at its expense, at the time of delivery of such
     certificates, deliver to the Holder a new Warrant representing the number
     of shares with respect to which this Warrant shall not then have been
     exercised.

          (c) Exercise Disputes. In the case of any dispute with respect to an
     exercise, the Company shall promptly issue such number of shares of Class A
     Common Stock as are not disputed in accordance with this Section. If such
     dispute involves the calculation of the Exercise Price, the Company shall
     submit the disputed calculations to a nationally recognized independent
     accounting firm (selected by the Company) via facsimile within three (3)
     business days of receipt of the Exercise Agreement. The accounting firm
     shall audit the calculations and notify the Company and the converting
     Holder of the results no later than two (2) business days from the date it
     receives the disputed calculations. The accounting firm's calculation shall
     be deemed conclusive, absent manifest error. The Company shall then issue
     the appropriate number of shares of Class A Common Stock in accordance with
     this Section.

          (d) Fractional Shares. No fractional shares of Class A Common Stock
     are to be issued upon the exercise of this Warrant, but the Company shall
     pay a cash adjustment in respect of any fractional share which would
     otherwise be issuable in an amount equal to the same fraction of the
     Exercise Price of a share of Class A Common Stock (as determined for
     exercise of this Warrant into whole shares of Class A Common Stock);
     provided that in the event that sufficient funds are not legally available
     for the payment of such cash adjustment any fractional shares of Class A
     Common Stock shall be rounded up to the next whole number.

          (e) Buy-In. If (i) the Company fails for any reason to deliver during
     the Delivery Period shares of Class A Common Stock to Holder upon an
     exercise of this Warrant and (ii) after the applicable Delivery Period

<PAGE>



     with respect to such an exercise, Holder purchases (in an open market
     transaction or otherwise) shares of Class A Common Stock to make delivery
     upon a sale by Holder of the shares of Class A Common Stock (the "Sold
     Shares") which Holder was entitled to receive upon such exercise (a
     "Buy-in"), the Company shall pay Holder (in addition to any other remedies
     available to Holder) the amount by which (x) Holder's total purchase price
     (including brokerage commission, if any) for the shares of Class A Common
     Stock so purchased exceeds (y) the lesser of (A) the Exercise Price or (B)
     the net proceeds received by Holder from the sale of the Sold Shares.
     Holder shall provide the Company written notification indicating any
     amounts payable to Holder pursuant to this subsection.

          2. Period of Exercise. This Warrant is exercisable at any time or from
     time to time on or after the date hereof and before 5:00 P.M., Central
     Standard Time on the fifth (5th) anniversary of the date hereof (the
     "Exercise Period").

          3. Certain Agreements of the Company. The Company hereby covenants and
     agrees as follows:

               (a) Shares to be Fully Paid. All Warrant Shares will, upon
     issuance in accordance with the terms of this Warrant, be validly issued,
     fully paid, and non-assessable and free from all taxes, liens, claims and
     encumbrances.

               (b) Reservation of Shares. During the Exercise Period, the
     Company shall at all times have authorized, and reserved for the purpose of
     issuance upon exercise of this Warrant, a sufficient number of shares of
     Class A Common Stock to provide for the exercise of this Warrant.

               (c) Listing. The Company shall promptly secure the listing of the
     shares of Class A Common Stock issuable upon exercise of this Warrant upon
     The Nasdaq National Market, or the New York Stock Exchange, as required by
     Section 4.10 of the Securities Purchase Agreement and upon each national
     securities exchange or automated quotation system, if any, upon which
     shares of Class A Common Stock are then listed or become listed and shall
     maintain, so long as any other shares of Class A Common Stock shall be so
     listed, such listing of all shares of Class A Common Stock from time to
     time issuable upon the exercise of this Warrant; and the Company shall so
     list on each such national securities exchange or automated quotation
     system, as the case may be, and shall maintain such listing of any other
     shares of capital stock of the Company issuable upon the exercise of this
     Warrant so long as any shares of the same class shall be listed on such
     national securities exchange or automated quotation system.

               (d) Certain Actions Prohibited. The Company will not, by
     amendment of its charter or through any reorganization, transfer of assets,
     consolidation, merger, dissolution, issue or sale of securities, or any
     other voluntary action, avoid or seek to avoid the observance or
     performance of any of the terms to be observed or performed by it
     hereunder, but will at all times in good faith assist in the carrying out
     of all the provisions of this Warrant and in the taking of all such actions
     as may reasonably be requested by the Holder of this Warrant in order to
     protect the exercise privilege of the Holder of this Warrant, consistent
     with the tenor and purpose of this Warrant. Without limiting the generality
     of the foregoing, the Company (i) will not increase the par value of any
     shares of Class A Common Stock receivable upon the exercise of this Warrant
     above the Exercise Price then in effect, and (ii) will take all such
     actions as may be necessary or appropriate in order that the Company may
     validly and legally issue fully paid and nonassessable shares of Class A
     Common Stock upon the exercise of this Warrant.

          4. Antidilution Provisions. During the Exercise Period, the Exercise
     Price and the number of Warrant Shares shall be subject to adjustment from
     time to time as provided in this Section 4. In the event

<PAGE>



     that any adjustment of the Exercise Price as required herein results in a
     fraction of a cent, such Exercise Price shall be rounded up or down to the
     nearest cent.

               (a) Adjustment of Exercise Price and Number of Shares upon
     Issuance of Common Stock. Except as otherwise provided in Section 4(c) and
     4(e) hereof, if and whenever after the initial issuance of this Warrant,
     the Company issues or sells, or in accordance with Section 4(b) hereof is
     deemed to have issued or sold, any shares of Common Stock for no
     consideration or for a consideration per share less than the Market Price
     (as herein defined) on the date of issuance (a "Dilutive Issuance"), then
     effective immediately upon the Dilutive Issuance, the Exercise Price will
     be adjusted in accordance with the following formula:

               E' = (E) (O + P/M) / (CSDO)


               where:

               E' = the adjusted Exercise Price E = the then current Exercise
               Price; M = the then current Market Price;
               O         = the number of shares of Common Stock outstanding
                         immediately prior to the Dilutive Issuance;
               P         = the aggregate consideration, calculated as set forth
                         in Section 4(b) hereof, received by the Company upon
                         such Dilutive Issuance; and
               CSDO      = the total number of shares of Common Stock Deemed
                         Outstanding (as herein defined) immediately after the
                         Dilutive Issuance.

               (b) Effect on Exercise Price of Certain Events. For purposes of
     determining the adjusted Exercise Price under Section 4(a) hereof, the
     following will be applicable:

                    (i) Issuance of Rights or Options. If the Company in any
     manner issues or grants any warrants, rights or options, whether or not
     immediately exercisable, to subscribe for or to purchase Common Stock or
     other securities exercisable, convertible into or exchangeable for Common
     Stock ("Convertible Securities"), but not to include the grant or exercise
     of any stock or options which may hereafter be granted or exercised under
     any employee or Director benefit plan of the Company now existing or to be
     implemented in the future, so long as the issuance of such stock or options
     is approved by a majority of the non-employee members of the Board of
     Directors of the Company or a majority of the members of a committee of
     non-employee directors established for such purpose (such warrants, rights
     and options to purchase Common Stock or Convertible Securities are
     hereinafter referred to as "Options"), and the price per share for which
     Common Stock is issuable upon the exercise of such Options is less than the
     Market Price on the date of issuance ("Below Market Options"), then the
     maximum total number of shares of Common Stock issuable upon the exercise
     of all such Below Market Options (assuming full exercise, conversion or
     exchange of Convertible Securities, if applicable) will, as of the date of
     the issuance or grant of such Below Market Options, be deemed to be
     outstanding and to have been issued and sold by the Company for such price
     per share. For purposes of the preceding sentence, the price per share for
     which Common Stock is issuable upon the exercise of such Below Market
     Options is determined by dividing (i) the total amount, if any, received or
     receivable by the Company as consideration for the issuance or granting of
     such Below Market Options, plus the minimum aggregate amount of additional
     consideration, if any, payable to the Company upon the exercise of all such
     Below Market Options, plus, in the case of Convertible Securities issuable
     upon the exercise of such Below Market Options, the minimum aggregate
     amount of additional consideration payable upon the exercise, conversion or
     exchange thereof at the time such Convertible Securities first become
     exercisable, convertible or

<PAGE>



     exchangeable, by (ii) the maximum total number of shares of Common Stock
     issuable upon the exercise of all such Below Market Options (assuming full
     conversion of Convertible Securities, if applicable). No further adjustment
     to the Exercise Price will be made upon the actual issuance of such Common
     Stock upon the exercise of such Below Market Options or upon the exercise,
     conversion or exchange of Convertible Securities issuable upon exercise of
     such Below Market Options.

                    (ii) Issuance of Convertible Securities.

                         (A) If the Company in any manner issues or sells any
     Convertible Securities, whether or not immediately convertible (other than
     where the same are issuable upon the exercise of Options) and the price per
     share for which Common Stock is issuable upon such exercise, conversion or
     exchange (as determined pursuant to Section 4(b)(ii)(B) if applicable) is
     less than the Market Price on the date of issuance, then the maximum total
     number of shares of Common Stock issuable upon the exercise, conversion or
     exchange of all such Convertible Securities will, as of the date of the
     issuance of such Convertible Securities, be deemed to be outstanding and to
     have been issued and sold by the Company for such price per share. For the
     purposes of the preceding sentence, the price per share for which Common
     Stock is issuable upon such exercise, conversion or exchange is determined
     by dividing (i) the total amount, if any, received or receivable by the
     Company as consideration for the issuance or sale of all such Convertible
     Securities, plus the minimum aggregate amount of additional consideration,
     if any, payable to the Company upon the exercise, conversion or exchange
     thereof at the time such Convertible Securities first become exercisable,
     convertible or exchangeable, by (ii) the maximum total number of shares of
     Common Stock issuable upon the exercise, conversion or exchange of all such
     Convertible Securities. No further adjustment to the Exercise Price will be
     made upon the actual issuances of such Common Stock upon exercise,
     conversion or exchange of such Convertible Securities.

                         (B) If the Company in any manner issues or sells any
     Convertible Securities with a fluctuating conversion or exercise price or
     exchange ratio (a "Variable Rate Convertible Security"), then the price per
     share for which Common Stock is issuable upon such exercise, conversion or
     exchange for purposes of the calculation contemplated by Section
     4(b)(ii)(A) shall be deemed to be the lowest price per share which would be
     applicable assuming that (1) all holding period and other conditions to any
     discounts contained in such Convertible Security have been satisfied, and
     (2) the Market Price on the date of issuance of such Convertible Security
     was 80% of the Market Price on such date (the "Assumed Variable Market
     Price").

                    (iii) Change in Option Price or Conversion Rate. Except for
     the grant or exercise of any stock or options which may hereafter be
     granted or exercised under any employee or Director benefit plan of the
     Company now existing or to be implemented in the future, so long as the
     issuance of such stock or options is approved by a majority of the
     non-employee members of the Board of Directors of the Company or a majority
     of the members of a committee of non-employee directors established for
     such purpose, if there is a change at any time in (i) the amount of
     additional consideration payable to the Company upon the exercise of any
     Options; (ii) the amount of additional consideration, if any, payable to
     the Company upon the exercise, conversion or exchange or any Convertible
     Securities; or (iii) the rate at which any Convertible Securities are
     convertible into or exchangeable for Common Stock (other than under or by
     reason of provisions designed to protect against dilution), the Exercise
     Price in effect at the time of such change will be readjusted to the
     Exercise Price which would have been in effect at such time had such
     Options or Convertible Securities still outstanding provided for such
     changed additional consideration or changed conversion rate, as the case
     may be, at the time initially granted, issued or sold.

<PAGE>



                    (iv) Treatment of Expired Options and Unexercised
     Convertible Securities. If, in any case, the total number of shares of
     Common Stock issuable upon exercise of any Options or upon exercise,
     conversion or exchange of any Convertible Securities is not, in fact,
     issued and the rights to exercise such option or to exercise, convert or
     exchange such Convertible Securities shall have expired or terminated, the
     Exercise Price then in effect will be readjusted to the Exercise Price
     which would have been in effect at the time of such expiration or
     termination had such Options or Convertible Securities, to the extent
     outstanding immediately prior to such expiration or termination (other than
     in respect of the actual number of shares of Common Stock issued upon
     exercise or conversion thereof), never been issued.

                    (v) Calculation of Consideration Received. If any Common
     Stock, Options or Convertible Securities are issued, granted or sold for
     cash, the consideration received therefor for purposes of this Warrant will
     be the amount received by the Company therefor, before deduction of
     reasonable commissions, underwriting discounts or allowances or other
     reasonable expenses paid or incurred by the Company in connection with such
     issuance, grant or sale, plus the minimum aggregate amount of additional
     consideration, if any, payable to the Company upon the exercise, conversion
     or exchange of all such Options or Convertible Securities at the time such
     Options or Convertible Securities first become exercisable, convertible or
     exchangeable. In case any Common Stock, Options or Convertible Securities
     are issued or sold for a consideration part or all of which shall be other
     than cash, the amount of the consideration other than cash received by the
     Company will be the fair market value of such consideration except where
     such consideration consists of freely-tradeable securities, in which case
     the amount of consideration received by the Company will be the Market
     Price thereof as of the date of receipt. In case any Common Stock, Options
     or Convertible Securities are issued in connection with any merger or
     consolidation in which the Company is the surviving corporation, the amount
     of consideration therefor will be deemed to be the fair market value of
     such portion of the net assets and business of the non-surviving
     corporation as is attributable to such Common Stock, Options or Convertible
     Securities, as the case may be. The fair market value of any consideration
     other than cash or securities will be determined in the good faith
     reasonable business judgment of the Board of Directors.

                    (vi) Exceptions to Adjustment of Exercise Price. No
     adjustment to the Exercise Price will be made (i) upon the exercise of any
     warrants, options or convertible securities issued and outstanding on the
     date hereof in accordance with the terms of such securities as of such
     date; (ii) upon the grant or exercise of any stock or options which may
     hereafter be granted or exercised under any employee or Director benefit
     plan of the Company now existing or to be implemented in the future, so
     long as the issuance of such stock or options is approved by a majority of
     the non-employee members of the Board of Directors of the Company or a
     majority of the members of a committee of non-employee directors
     established for such purpose; (iii) upon the issuance of the Common Shares
     (as defined in the Securities Purchase Agreement) or Warrants in accordance
     with terms of the Securities Purchase Agreement; or (iv) upon the exercise
     of the Warrants.

               (c) Subdivision or Combination of Common Stock. If the Company,
     at any time after the initial issuance of this Warrant, subdivides (by any
     stock split, stock dividend, recapitalization, reorganization,
     reclassification or otherwise) its shares of Common Stock into a greater
     number of shares, then, after the date of record for effecting such
     subdivision, the Exercise Price in effect immediately prior to such
     subdivision will be proportionately reduced. If the Company, at any time
     after the initial issuance of this Warrant, combines (by reverse stock
     split, recapitalization, reorganization, reclassification or otherwise) its
     shares of Common Stock into a smaller number of shares, then, after the
     date of record for effecting such combination, the

<PAGE>



     Exercise Price in effect immediately prior to such combination will be
     proportionately increased.

               (d) Adjustment in Number of Shares. Upon each adjustment of the
     Exercise Price pursuant to the provisions of this Section 4, the number of
     shares of Common Stock issuable upon exercise of this Warrant shall be
     adjusted by multiplying a number equal to the Exercise Price in effect
     immediately prior to such adjustment by the number of shares of Common
     Stock issuable upon exercise of this Warrant immediately prior to such
     adjustment and dividing the product so obtained by the adjusted Exercise
     Price.

               (e) Major Transactions. If the Company shall consolidate or merge
     with any other corporation or entity (other than a merger in which the
     Company is the surviving or continuing entity and its capital stock is
     unchanged and unissued in such transaction (except for issuances which do
     not exceed twenty percent (20%) of the Class A Common Stock and do not
     result in a Change of Control (as defined in the Debenture))) or there
     shall occur any share exchange pursuant to which all of the outstanding
     shares of Common Stock are converted into other securities or property or
     any reclassification or change of the outstanding shares of Common Stock or
     the Company shall sell all or substantially all of its assets (each of the
     foregoing being a "Major Transaction"), then the holder of this Warrant
     may, at its option, either (a) in the event that the Common Stock remains
     outstanding or holders of Common Stock receive any common stock or
     substantially similar equity interest, in each of the foregoing cases which
     is publicly traded, retain this Warrant and this Warrant shall continue to
     apply to such Common Stock or shall apply, as nearly as practicable, to
     such other common stock or equity interest, as the case may be, or (b)
     regardless of whether (a) applies, receive consideration, in exchange for
     this Warrant (without payment of any exercise price hereunder), equal to
     the greater of, as determined in the sole discretion of such holder: (i)
     the number of shares of stock or securities or property of the Company, or
     of the entity resulting from such Major Transaction (the "Major Transaction
     Consideration"), to which a holder of the number of shares of Common Stock
     delivered upon the exercise of this Warrant (pursuant to the cashless
     exercise feature hereof) would have been entitled upon such Major
     Transaction had such holder so exercised this Warrant (without regard to
     any limitations on exercise herein or elsewhere contained) on the trading
     date immediately preceding the public announcement of the transaction
     resulting in such Major Transaction and had such Common Stock been issued
     and outstanding and had such Holder been the holder of record of such
     Common Stock at the time of the consummation of such Major Transaction, and
     (ii) cash paid by the Company in immediately available funds, in an amount
     equal to one hundred and twenty five percent (125%) of the Black-Scholes
     Amount (as defined herein) times the number of shares of Common Stock for
     which this Warrant was exercisable (without regard to any limitations on
     exercise herein contained and assuming payment of the exercise payment in
     cash hereunder); and the Company shall make lawful provision for the
     foregoing as a part of such Major Transaction and shall cause the issuer of
     any security in such transaction which constitutes Registrable Securities
     under that certain Registration Rights Agreement dated April 14, 1999 among
     the Company and the signatories thereto (the "Registration Rights
     Agreement") to assume all of the Company's obligations under the
     Registration Rights Agreement (provided any cash election pursuant to
     clause (ii) above must be made in writing to the Company within ten (10)
     business days following consummation of such applicable transaction (or, in
     the event that a Company Transaction (as defined below) occurs, within ten
     (10) business days following the Measurement Period (as defined below)). In
     the event that the Company shall consolidate or merge with any other
     corporation in a transaction in which common stock of the surviving
     corporation or the parent thereof (the "Exchange Securities") is issued to
     the holders of Common Stock in such transaction in exchange for all such
     Common Stock, and (a) the Exchange Securities are publicly traded, (b) the
     average daily trading volume of the Exchange Securities during the one
     hundred eighty

<PAGE>



     (180) day period ending on the date on which such transaction is publicly
     disclosed is greater than two million dollars ($2,000,000) per day, (c) the
     historical one hundred (100) day volatility of the Exchange Securities
     during the period ending on the date on which such transaction is publicly
     disclosed is greater than sixty percent (60%) and (d) the market
     capitalization of the issuer of the Exchange Securities is not less than
     one hundred fifty million dollars ($150,000,000) based on the last sale
     price of the Exchange Securities on the date immediately before the date on
     which such transaction is publicly disclose (in each case, with respect to
     the foregoing clauses (a) through (d), as reported by Bloomberg), then the
     provisions of clause (b) of the preceding sentence shall not apply. In the
     event that the Company shall, in a Major Transaction, consolidate or merge
     with any other corporation in a transaction in which the Company is the
     survivor (a "Company Transaction"), the provisions of clause (ii) of the
     second preceding sentence shall not apply to the extent that each of the
     following conditions remain true for the thirty (30) business days
     commencing as of the date of the consummation of such transaction (the
     "Measurement Period"): (a) the Class A Common Stock remains publicly traded
     during the period, (b) the average daily trading volume of the Class A
     Common Stock is greater than two million dollars ($2,000,000), (c) the
     historical thirty (30) day volatility of the Company's Class A Common Stock
     is greater than sixty percent (60%), and (d) the market capitalization of
     the Company (including Class B Common Stock) is not less than one hundred
     fifty million dollars ($150,000,000) on the last day of the period (in each
     case, with respect to the foregoing clauses (a) through (d), as reported by
     Bloomberg). No sooner than ten (10) business days nor later than five (5)
     business days prior to the consummation of the Major Transaction or Common
     Stock Major Transaction, as the case may be (each, a "Transaction"), but
     not prior to the public announcement of such Transaction, the Company shall
     deliver written notice ("Notice of Transaction") to each holder of a
     Warrant, which Notice of Transaction shall be deemed to have been delivered
     one (1) business day after the Company's sending such notice by telecopy
     (provided that the Company sends a confirming copy of such notice on the
     same day by overnight courier) of such Notice of Transaction. Such Notice
     of Transaction shall indicate the amount and type of the transaction
     consideration which such holder of a Warrant would receive under this
     Section ("Transaction Consideration"). If the Transaction Consideration is
     cash and does not consist entirely of United States currency, such holder
     may elect to receive United States currency in an amount equal to the value
     of the Transaction Consideration in lieu of the Transaction Consideration
     by delivering notice of such election to the Company within five (5)
     business days of such holder's receipt of the Notice of Transaction.

     The "Black-Scholes Amount" shall be an amount equal to 0.75 times the
     amount determined by calculating the "Black-Scholes" value of an option to
     purchase one share of Common Stock on the applicable page on the Bloomberg
     online page, using the following variable values: (i) the current market
     price of the Common Stock equal to the closing trade price on the last
     trading day before the date of the Notice of Transaction; (ii) volatility
     of the Common Stock equal to the volatility of the common Stock during the
     100 trading day period preceding the date of the Notice of Transaction;
     (iii) a risk free rate equal to the interest rate on the United States
     treasury bill or treasury note with a maturity corresponding to the
     remaining term of this Warrant on the date of the Notice of Transaction;
     and (iv) an exercise price equal to the Exercise Price on the date of the
     Notice of the Transaction. In the event such calculation function is no
     longer available utilizing the Bloomberg online page, the Holder shall
     calculate such amount in its sole discretion using the closest available
     alternative mechanism and variable values to those available utilizing the
     Bloomberg online page for such calculation function.

               (f) Distribution of Assets. In case the Company shall declare or
     make any distribution of its assets (or rights to acquire its assets) to
     holders of Common Stock as a partial liquidating dividend, by way of return
     of capital or otherwise (including any dividend or distribution to

<PAGE>



     the Company's shareholders of cash or shares (or rights to acquire shares)
     of capital stock of a subsidiary) (a "Distribution"), at any time after the
     initial issuance of this Warrant, then the Holder shall be entitled upon
     exercise of this Warrant for the purchase of any or all of the shares of
     Common Stock subject hereto, to receive the amount of such assets (or
     rights) which would have been payable to the Holder had such Holder been
     the holder of such shares of Common Stock on the record date for the
     determination of shareholders entitled to such Distribution.

               (g) Notices of Adjustment. Upon the occurrence of any event which
     requires any adjustment of the Exercise Price, then, and in each such case,
     the Company shall give notice thereof to the Holder, which notice shall
     state the Exercise Price resulting from such adjustment and the increase or
     decrease in the number of Warrant Shares purchasable at such price upon
     exercise, setting forth in reasonable detail the method of calculation and
     the facts upon which such calculation is based. Such calculation shall be
     certified by the chief financial officer of the Company.

               (h) Minimum Adjustment of Exercise Price. No adjustment of the
     Exercise Price shall be made in an amount of less than 1% of the Exercise
     Price in effect at the time such adjustment is otherwise required to be
     made, but any such lesser adjustment shall be carried forward and shall be
     made at the time and together with the next subsequent adjustment which,
     together with any adjustments so carried forward, shall amount to not less
     than 1% of such Exercise Price.

               (i) No Fractional Shares. No fractional shares of Class A Common
     Stock are to be issued upon the exercise of this Warrant, but the Company
     shall pay a cash adjustment in respect of any fractional share which would
     otherwise be issuable in an amount equal to the same fraction of the Market
     Price of a share of Class A Common Stock; provided that in the event that
     sufficient funds are not legally available for the payment of such cash
     adjustment any fractional shares of Class A Common Stock shall be rounded
     up to the next whole number.

               (j)  Other Notices.  In case at any time:

                    (i) the Company shall declare any dividend upon the Common
     Stock payable in shares of stock of any class or make any other
     distribution to the holders of the Common Stock;

                    (ii) the Company shall offer for subscription pro rata to
     the holders of the Common Stock any additional shares of stock of any class
     or other rights;

                    (iii) there shall be any capital reorganization of the
     Company, or reclassification of the Common Stock, or consolidation or
     merger of the Company with or into, or sale of all or substantially all of
     its assets to, another corporation or entity; or

                    (iv) there shall be a voluntary or involuntary dissolution,
     liquidation or winding-up of the Company;

     then, in each such case, the Company shall give to the Holder (a) notice of
     the date on which the books of the Company shall close or a record shall be
     taken for determining the holders of Common Stock entitled to receive any
     such dividend, distribution, or subscription rights or for determining the
     holders of Common Stock entitled to vote in respect of any such
     reorganization, reclassification, consolidation, merger, sale, dissolution,
     liquidation or winding-up and (b) in the case of any such reorganization,
     reclassification, consolidation, merger, sale, dissolution, liquidation or
     winding-up, notice of the date (or, if not then known, a reasonable
     approximation thereof by the Company) when the same shall take place. Such
     notice shall also specify the date on which the holders of Common Stock
     shall be entitled to receive such dividend,

<PAGE>



     distribution, or subscription rights or to exchange their Common Stock for
     stock or other securities or property deliverable upon such reorganization,
     reclassification, consolidation, merger, sale, dissolution, liquidation, or
     winding-up, as the case may be. Such notice shall be given at least 30 days
     prior to the record date or the date on which the Company's books are
     closed in respect thereto, but in no event earlier than public announcement
     of such proposed transaction or event. Failure to give any such notice or
     any defect therein shall not affect the validity of the proceedings
     referred to in clauses (i), (ii), (iii) and (iv) above.

               (k)  Certain Definitions.

                    (i) "Common Stock Deemed Outstanding" shall mean the number
     of shares of Common Stock actually outstanding (not including shares of
     Common Stock held in the treasury of the Company), plus (x) in case of any
     adjustment required by Section 4(a) resulting from the issuance of any
     Options, the maximum total number of shares of Common Stock issuable upon
     the exercise of the Options for which the adjustment is required (including
     any Common Stock issuable upon the conversion of Convertible Securities
     issuable upon the exercise of such Options), and (y) in the case of any
     adjustment required by Section 4(a) resulting from the issuance of any
     Convertible Securities, the maximum total number of shares of Common Stock
     issuable upon the exercise, conversion or exchange of the Convertible
     Securities for which the adjustment is required, as of the date of issuance
     of such Convertible Securities, if any.

                    (ii) "Market Price," as of any date, (i) means the average
     of the Closing Sale Prices for the shares of Common Stock as reported to
     The Nasdaq National Market for the trading day immediately preceding such
     date, or (ii) if The Nasdaq National Market is not the principal trading
     market for the Common Stock, the average of the last reported bid prices on
     the principal trading market for the Common Stock during the same period,
     or, if there is no bid price for such period, the last reported sales price
     for such period, or (iii) if market value cannot be calculated as of such
     date on any of the foregoing bases, the Market Price shall be the average
     fair market value as reasonably determined by an investment banking firm
     selected by the Company and reasonably acceptable to the Holders of a
     majority in interest of the Warrants, with the costs of the appraisal to be
     borne by the Company. The manner of determining the Market Price of the
     Common Stock set forth in the foregoing definition shall apply with respect
     to any other security in respect of which a determination as to market
     value must be made hereunder.

                    (iii) "Common Stock," for purposes of this Section 4,
     includes the Common Stock and any additional class of stock of the Company
     having no preference as to dividends or distributions on liquidation,
     provided that the shares purchasable pursuant to this Warrant shall include
     only Common Stock in respect of which this Warrant is exercisable, or
     shares resulting from any subdivision or combination of such Common Stock,
     or in the case of any reorganization, reclassification, consolidation,
     merger, or sale of the character referred to in Section 4(e) hereof, the
     stock or other securities or property provided for in such Section.

               (l) Other Adjustments. If any Key Officers (as defined in the
     Securities Purchase Agreement) or any replacement of any Key Officer,
     during the six-month period beginning on the date that the registration
     statement required pursuant to Section 2.1 of the Registration Rights
     Agreement, and while an officer or director, directly or indirectly, offer,
     sell, transfer, assign, pledge, or otherwise dispose of any shares of
     Common Stock, or any securities directly or indirectly convertible into or
     exercisable or exchangeable for, or warrants, options or rights to purchase
     or acquire shares of Common Stock (all such securities, "Options") or enter
     into any agreement, contract, arrangement or understanding with respect to
     any such offer, sale, transfer, assignment,

<PAGE>



     pledge or other disposition of any Common Stock or Options (an "Executive
     Transfer"), then the Exercise Price shall be reduced by twenty percent
     (20%). Provided, however that a Key Officer may sell up to ten percent
     (10%) of his or her total holdings during such six-month period without
     triggering the adjustments of this Section 8.10.

          5.   [Intentionally omitted]

          6. Issue Tax. The issuance of certificates for Warrant Shares upon the
     exercise of this Warrant shall be made without charge to the Holder or such
     shares for any issuance tax or other costs in respect thereof, provided
     that the Company shall not be required to pay any tax which may be payable
     in respect of any transfer involved in the issuance and delivery of any
     certificate in a name other than the Holder.

          7. No Rights or Liabilities as a Shareholder. This Warrant shall not
     entitle the Holder to any voting rights or other rights as a shareholder of
     the Company. No provision of this Warrant, in the absence of affirmative
     action by the Holder to purchase Warrant Shares, and no mere enumeration
     herein of the rights or privileges of the Holder, shall give rise to any
     liability of the Holder for the Exercise Price or as a shareholder of the
     Company, whether such liability is asserted by the Company or by creditors
     of the Company.

          8. Transfer, Exchange, Redemption and Replacement of Warrant.

               a. Restriction on Transfer. This Warrant and the rights granted
     to the Holder are transferable, in whole or in part, upon surrender of this
     Warrant, together with a properly executed assignment in the Form of
     Assignment attached hereto as Exhibit 2, at the office or agency of the
     Company referred to in Section 8(e) below, provided, however, that any
     transfer or assignment shall be subject to the provisions of Section 5.1
     and 5.2 of the Securities Purchase Agreement. Until due presentment for
     registration of transfer on the books of the Company, the Company may treat
     the registered holder hereof as the owner and holder hereof for all
     purposes, and the Company shall not be affected by any notice to the
     contrary. Notwithstanding anything to the contrary contained herein, the
     registration rights described in Section 9 hereof are assignable only in
     accordance with the provisions of the Registration Rights Agreement.

               b. Warrant Exchangeable for Different Denominations. This Warrant
     is exchangeable, upon the surrender hereof by the Holder at the office or
     agency of the Company referred to in Section 8(e) below, for new Warrants,
     in the form hereof, of different denominations representing in the
     aggregate the right to purchase the number of shares of Common Stock which
     may be purchased hereunder, each of such new Warrants to represent the
     right to purchase such number of shares as shall be designated by the
     Holder of at the time of such surrender.

               c. Replacement of Warrant. Upon receipt of evidence reasonably
     satisfactory to the Company of the loss, theft, destruction, or mutilation
     of this Warrant or, in the case of any such loss, theft, or destruction,
     upon delivery, of an indemnity agreement reasonably satisfactory in form
     and amount to the Company, or, in the case of any such mutilation, upon
     surrender and cancellation of this Warrant, the Company, at its expense,
     will execute and deliver, in lieu thereof, a new Warrants, in the form
     hereof, in such denominations as Holder may request.

               d. Cancellation; Payment of Expenses. Upon the surrender of this
     Warrant in connection with any transfer, exchange, or replacement as
     provided in this Section 8, this Warrant shall be promptly canceled by the
     Company. The Company shall pay all issuance taxes (other than securities
     transfer taxes) and charges payable in connection with the preparation,
     execution, and delivery of Warrants pursuant to this Section 8.

<PAGE>



               e. Warrant Register. The Company shall maintain, at its principal
     executive offices (or such other office or agency of the Company as it may
     designate by notice to the Holder), a register for this Warrant, in which
     the Company shall record the name and address of the person in whose name
     this Warrant has been issued, as well as the name and address of each
     transferee and each prior owner of this Warrant.

               f. Additional Restriction on Exercise or Transfer.
     Notwithstanding anything to the contrary contained herein, the Warrants
     shall not be exercisable by the Holder to the extent (but only to the
     extent) that, if exercisable by Holder, Holder would beneficially own in
     excess of 4.9% (the "Applicable Percentage") of the shares of Class A
     Common Stock. To the extent the above limitation applies, the determination
     of whether the Warrants shall be exercisable (vis-a-vis other securities
     owned by Holder which contain similar limitations on conversion) and of
     which Warrants shall be exercisable (as among Warrants) shall be made on
     the basis of the earliest submission of the Warrants (vis-a-vis other
     securities owned by the Holder which contain similar limitations on
     conversion and vis a vis other Warrants), in each case subject to such
     aggregate percentage limitation. No prior inability to exercise Warrants
     pursuant to this paragraph shall have any effect on the applicability of
     the provisions of this paragraph with respect to any subsequent
     determination of exercisability. For the purposes of this paragraph,
     beneficial ownership and all determinations and calculations, including
     without limitation, with respect to calculations of percentage ownership,
     shall be determined in accordance with Section 13(d) of the Securities
     Exchange Act of 1934, as amended, and Regulation 13D and G thereunder. The
     provisions of this paragraph may be implemented in a manner otherwise than
     in strict conformity with the terms of this Section 8(f) with the approval
     of the Board of Directors of the Company and the Holder: (i) with respect
     to any matter to cure any ambiguity herein, to correct this paragraph (or
     any portion hereof) which may be defective or inconsistent with the
     intended Applicable Percentage beneficial ownership limitation herein
     contained or to make changes or supplements necessary or desirable to
     properly give effect to such Applicable Percentage limitation; and (ii)
     with respect to any other matter, with the further consent of the holders
     of a majority of the then outstanding shares of Class A Common Stock. For
     clarification, it is expressly a term of this security that the limitations
     contained in this Section shall apply to each successor Holder.

          9. Registration Rights. The initial holder of this Warrant (and
     certain assignees thereof) is entitled to the benefit of such registration
     rights in respect of the Warrant Shares as are set forth in the
     Registration Rights Agreement.

          10. Notices. Any notice herein required or permitted to be given shall
     be in writing and may be personally served or delivered by courier or by
     confirmed telecopy, and shall be deemed delivered at the time and date of
     receipt (which shall include telephone line facsimile transmission). The
     addresses for such communications shall be:

               If to the Company:

                    Westell Technologies, Inc.
                    750 N. Commons Drive
                    Aurora, IL 60504
                    Telecopy: (630) 375-4940
                    Attention: Stephen J. Hawrysz

                    with a copy to:

                    Neal J. White, P.C.
                    McDermott, Will & Emery
                    227 West Monroe Street
                    Chicago, IL 60606

<PAGE>



                    Telecopy:  (312) 984-3669      
                    Attention:  (312) 984-7579    

     and if to the Holder, at such address as Holder shall have provided in
     writing to the Company, or at such other address as each such party
     furnishes by notice given in accordance with this Section 10.

          11. Governing Law; Jurisdiction. This Warrant shall be governed by and
     construed in accordance with the laws of the State of New York applicable
     to contracts made and to be performed in the State of New York. The Company
     irrevocably consents to the jurisdiction of the United States federal
     courts located in the State of New York and the state courts located in the
     County of New York in the State of New York in any suit or proceeding based
     on or arising under this Warrant and irrevocably agrees that all claims in
     respect of such suit or proceeding may be determined in such courts. The
     Company irrevocably waives the defense of an inconvenient forum to the
     maintenance of such suit or proceeding. The Company agrees that a final
     nonappealable judgment in any such suit or proceeding shall be conclusive
     and may be enforced in other jurisdictions by suit on such judgment or in
     any other lawful manner.

          12.  Miscellaneous.

               a.   Amendments.  This Warrant and any provision hereof may only
     be  amended by  an instrument  in writing  signed by  the Company  and the
     Holder.

               b. Descriptive Headings. The descriptive headings of the several
     Sections of this Warrant are inserted for purposes of reference only, and
     shall not affect the meaning or construction of any of the provisions
     hereof.

               c. Cashless Exercise. Notwithstanding anything to the contrary
     contained in this Warrant, this Warrant may be exercised by presentation
     and surrender of this Warrant to the Company at its principal executive
     offices with a written notice of the Holder's intention to effect a
     cashless exercise, including a calculation of the number of shares of Class
     A Common Stock to be issued upon such exercise in accordance with the terms
     hereof (a "Cashless Exercise"). In the event of a Cashless Exercise, in
     lieu of paying the Exercise Price in cash, the Holder shall surrender this
     Warrant for the number of shares of Class A Common Stock determined by
     multiplying the number of Warrant Shares to which it would otherwise be
     entitled by a fraction, the numerator of which shall be the difference
     between the then current Market Price per share of the Class A Common Stock
     and the Exercise Price, and the denominator of which shall be such then
     current Market Price per share of Class A Common Stock.

               d. Assignability. This Warrant shall be binding upon the Company
     and its successors and assigns and shall inure to the benefit of Holder and
     its successors and assigns. The Holder shall notify the Company upon the
     assignment of this Warrant.

          IN WITNESS WHEREOF, the Company has caused this Warrant to be signed
     by its duly authorized officer.


                                        Westell Technologies, Inc.

                                       By:
                                             ---------------------------------

                                      Name:
                                     Title:


                           FORM OF EXERCISE AGREEMENT

<PAGE>



           (To be Executed by the Holder in order to Exercise the Warrant)

          The undersigned hereby irrevocably exercises the right to purchase
     ____________ of the shares of common stock of Westell Technologies, Inc., a
     Delaware corporation (the "Company"), evidenced by the attached Warrant,
     and [herewith makes payment of the Exercise Price with respect to such
     shares in full/ elects to effect a Cashless Exercise pursuant to the terms
     of the Warrant], all in accordance with the conditions and provisions of
     said Warrant.

          (i) The undersigned agrees not to offer, sell, transfer or otherwise
     dispose of any Common Stock obtained on exercise of the Warrant, except
     under circumstances that will not result in a violation of the Securities
     Act of 1933, as amended, or any state securities laws.

          (ii) The undersigned requests that stock certificates for such shares
     be issued, and a Warrant representing any unexercised portion hereof be
     issued, pursuant to the Warrant in the name of the Holder (or such other
     person or persons indicated below) and delivered to the undersigned (or
     designee(s) at the address (or addresses) set forth below:

     Date:                                                            
                                        Signature of Holder


                                        Name of Holder (Print)

                                        Address:



                               FORM OF ASSIGNMENT

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns, and
     transfers all rights of the undersigned under the within Warrant, with
     respect to the number of shares of Common Stock covered thereby set forth
     hereinbelow, to:

     Name of Assignee                   Address                  No. of Shares


     ,     and     hereby     irrevocably     constitutes      and     appoints
     ______________________________ as agent  and attorney-in-fact to  transfer
     said Warrant on the books of the within-named corporation, with full power
     of substitution in the premises.


     Date:____________, _____,

     In the presence of

                                        -------------------------------------
                                      Name:

                                        -------------------------------------
                                        Signature:

                                        Title of Signing Officer or Agent (if
                                        any):

                                        Address:

                                        Note:     The  above  signature  should
                                                  correspond  exactly  with the
                                                  name  on  the  face   of  the
                                                  within Warrant.

<PAGE>





     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

<PAGE>



               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:

<PAGE>



                    (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:

<PAGE>



                         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%

<PAGE>







                               SECURITY AGREEMENT

          THIS SECURITY AGREEMENT ("Agreement") dated as of April 14, 1999 is
     entered into by Westell Technologies, Inc., a Delaware corporation
     ("Company"), Westell, Inc., an Illinois corporation and Westell
     International, Inc., a Delaware corporation (collectively, the "Debtors"
     and each individually a "Debtor"), and Castle Creek Technology Partners LLC
     ("Secured Party").

                                    Recitals:

          A. Company has entered into a certain Securities Purchase Agreement of
     even date herewith between Company and Secured Party, pursuant to which
     Secured Party has agreed, subject to the terms and conditions thereof, to
     purchase a certain 6% Subordinated Convertible Debenture of even date (as
     amended, restated or otherwise modified and in effect from time to time the
     "Debenture").

          B. It is a condition precedent to the purchase of the Debenture that
     Debtors shall have granted the security interest contemplated by this
     Agreement.

          NOW, THEREFORE, in consideration of the premises and to induce Secured
     Party to purchase the Debenture and to make the Loans to Company
     thereunder, and for other good and valuable consideration, the receipt and
     sufficiency of which are hereby acknowledged, the parties agree as follows:

          1. Definitions. Capitalized terms used herein without definition are
     used herein as defined in the Debenture. In addition, the following terms
     shall have the following meanings:

               "Accounts" shall mean any "account," as such term is defined in
     the Uniform Commercial Code.

               "Account Debtor" shall mean the Person who is or may be obligated
     to any Debtor under, with respect to or on account of an Account, an
     Instrument, a General Intangible or other Collateral.

               "Chattel Paper" shall mean any "chattel paper," as such term is
     defined in the Uniform Commercial Code.

               "Collateral" is defined in Section 2 hereof.

               "Contracts" shall mean all contracts, undertakings or other
     agreements (other than rights evidenced by Chattel Paper, Documents or
     Instruments) in or under which any Debtor may now or hereafter have any
     right, title or interest, including, without limitation, with respect to an
     Account, any agreement relating to the terms of payment or the terms of
     performance thereof.

               "Copyrights" shall mean any of each Debtor's copyrights, rights
     and interests in copyrights, works protectable by copyrights, copyright
     registrations and copyright applications, including, without limitation,
     the copyright registrations and applications listed on Schedule 3 attached
     hereto, and all renewals of any of the foregoing, all income, royalties,
     damages and payments now or hereafter due or payable under or with respect
     to any of the foregoing, including, without limitation, damages and
     payments for past, present and future infringements of any of the foregoing
     and the right to sue for past, present and future infringements of any of
     the foregoing.

               "Documents" shall mean any "documents," as such term is defined
     in the Uniform Commercial Code.

               "Equipment"  shall mean any "equipment," as such term is defined

<PAGE>



     in the Uniform Commercial Code and shall include fixtures, motor vehicles,
     tractors, trailers and other like property, whether or not the title
     thereto is governed by a certificate of title or ownership.

               "Event of Default" means an Event of Failure under the Debenture
     after expiration of any cure periods.

               "General Intangibles" shall mean any "general intangibles," as
     such term is defined in the Uniform Commercial Code and shall include,
     without limitation, all right, title and interest in or under any Contract,
     drawings, materials and records, claims, literary rights, goodwill, rights
     of performance, Copyrights, Trademarks, patents, warranties, rights under
     insurance policies and rights of indemnification.

               "Goods" shall mean any "goods," as such term is defined in the
     Uniform Commercial Code.

               "Instruments" shall mean any "instrument," as such term is
     defined in the Uniform Commercial Code and shall include, without
     limitation, promissory notes, drafts, bills of exchange, trade acceptances,
     letters of credit and Chattel Paper.

               "Inventory" shall mean any "inventory," as such term is defined
     in the Uniform Commercial Code.

               "Investment Property" shall mean any "investment property," as
     such term is defined in the Uniform Commercial Code, other than shares or
     other equity interests of non-U.S. subsidiaries.

               "LaSalle" means LaSalle National Bank or its successors or
     assigns or replacements of holders of Permitted Senior Indebtedness under
     clause (i) of the definition of such Permitted Senior Indebtedness.

               "Obligations" shall mean all obligations of the Company under the
     Debenture, the PIK Debentures and the Cap Debenture including, without
     limitations, the Company's obligation to pay principal and interest and to
     redeem the Debentures.

               "Patents" shall mean any of each Debtor's patents and patent
     applications, including, without limitation, the inventions and
     improvements described and claimed therein, all patentable inventions and
     those patents and patent applications listed on Schedule 4 attached hereto,
     and the reissues, divisions, continuation, renewals, extensions and
     continuations-in-part of any of the foregoing, and all income, royalties,
     damages and payments now or hereafter due or payable under or with respect
     to any of the foregoing, including, without limitation, damages and
     payments for past, present and future infringements of any of the foregoing
     and the right to sue for past, present and future infringements of any of
     the foregoing.

               "Permitted Senior Indebtedness" shall have the meaning given to
     it in the Securities Purchase Agreement.

               "Proceeds" shall mean "proceeds," as such term is defined in the
     Uniform Commercial Code and shall include, without limitation, (a) any and
     all proceeds of any insurance, indemnity, warranty or guaranty payable with
     respect to any of the Collateral, (b) any and all payments, in any form
     whatsoever, made or due and payable from time to time in connection with
     any confiscation, condemnation, seizure or forfeiture of all or any part of
     the Collateral by any governmental authority, and (c) any and all other
     amounts from time to time paid or payable under, in respect of or in
     connection with any of the Collateral.

               "Subordination Agreement" means that certain Subordination
     Agreement between Secured Party and LaSalle National Bank of even date
     herewith and any successor subordination agreement executed by Secured

<PAGE>



     Party and LaSalle.

               "Trademarks" shall mean any of each Debtor's trademarks, trade
     names, corporate names, company names, business names, fictitious business
     names, trade styles, service marks, logos, other business identifiers,
     prints and labels on which any of the foregoing have appeared or appear,
     all registrations and recordings thereof, and all applications in
     connection therewith, including, without limitation, the trademarks and
     applications listed on Schedule 5 attached hereto and renewals thereof, and
     all income, royalties, damages and payments now or hereafter due or payable
     under or with respect to any of the foregoing, including, without
     limitation, damages and payments for past, present and future infringements
     of any of the foregoing and the right to sue for past, present and future
     infringements of any of the foregoing.

               "Uniform Commercial Code" shall mean the Uniform Commercial Code
     as in effect from time to time in the State of Illinois; provided, however,
     if, by reason of mandatory provisions of law, the attachment, perfection or
     priority of Secured Party's security interest in any Collateral is governed
     by the Uniform Commercial Code as in effect in a jurisdiction other than
     the State of Illinois, the term "Uniform Commercial Code" shall mean the
     Uniform Commercial Code as in effect in such other jurisdiction for
     purposes of the provisions hereof relating to such attachment, perfection
     or priority and for purposes of definitions related to such provisions.

          2. Grant of Security Interest. As collateral security for the prompt
     payment, performance and observance in full of the Obligations, each Debtor
     hereby pledges and grants to Secured Party, a Lien on and security interest
     in and to all of such Debtor's right, title and interest in the following
     property and interests in property, whether now owned or hereafter acquired
     by such Debtor and wherever located (collectively, the "Collateral"):

               (a)  all Accounts;

               (b)  all Inventory;

               (c)  all General Intangibles;

               (d) all Instruments, together with all payments thereon or
     thereunder;

               (e)  all Equipment;

               (f)  all Documents;

               (g)  all Contracts;
               (h)  all Goods;

               (i)  all  Investment Property  including without  limitation all
     shares  of stock  in Westell,  Inc. and  Westell International,  Inc., but
     except shares of stock of Conference Plus, Inc.;

               (j) all bank and depositary accounts maintained by each Debtor,
     all funds on deposit therein, all investments arising out of such funds,
     all claims thereunder or in connection therewith, and all cash, securities,
     rights and other property at any time and from time to time received,
     receivable or otherwise distributed in respect of such accounts;

               (k) all other tangible and intangible property of Debtor,
     including without limitation, all Proceeds, products, accessions, rents,
     profits, income, benefits, substitutions, additions and replacement of and
     to any of the property described in this Section 2 including, without
     limitation, any proceeds of insurance thereon and all rights, claims and
     benefits against any Person relating thereto) and all books,

<PAGE>



     correspondence files, records, invoices and other papers, including,
     without limitation, all tapes, cards, computer runs, computer programs,
     computer files and other papers, documents and records in the possession or
     under the control of each Debtor or any computer bureau or service company
     from time to time acting for each Debtor.

          3. Representations, Warranties and Covenants of Debtor. Each Debtor
     represents and warrants to, and covenants with, Secured Party as follows:

               (a) Debtor is and will be the owner of the Collateral and no Lien
     other than Liens securing Permitted Senior Indebtedness and liens that are
     Permitted Liens under the Loan Agreement pertaining to Permitted Senior
     Indebtedness exists or will exist upon such Collateral at any time.

               (b) This Agreement is effective to create in favor of Secured
     Party a valid security interest in and Lien upon all of Debtor's right,
     title and interest in and to the Collateral and, upon the filing of
     appropriate Uniform Commercial Code financing statements in the
     jurisdictions listed on Schedule 1 attached hereto, such security interest
     will be duly perfected in all of the Collateral (other than Instruments not
     constituting Chattel Paper, Investment Property, deposit accounts and cash
     and Patents and Trademarks), and upon delivery of the Instruments and
     Investment Property to LaSalle, duly endorsed by Debtor or accompanied by
     appropriate instruments of transfer duly executed by Debtor, the security
     interest in the Instruments will be duly perfected in accordance with the
     provisions of the Subordination Agreement.

               (c) All of the Equipment, Inventory and Goods are located at the
     places specified on Schedule 1 attached hereto. Except as disclosed on
     Schedule 1, none of the Collateral is in the possession of any bailee,
     warehouseman, processor or consignee. The chief place of business, chief
     executive office and the office where Debtor keeps its books and records
     are located at the place specified on Schedule 1. Debtor does not do
     business and has not done business under any trade name or fictitious
     business name except as disclosed on Schedule 2 attached hereto.


               (d) All information heretofore, herein or hereafter furnished to
     Secured Party by or on behalf of Debtor with respect to the Collateral is
     and will be accurate and complete in all material respects.

          4. Agreements of Debtor. Subject to the provisions of the
     Subordination Agreement and to Debtors' agreement under Security Agreement
     pertaining to the Permitted Senior Indebtedness Debtor hereby agrees with
     Secured Party as follows:

               (a) Delivery of Instruments. Instruments shall be held by
     LaSalle, and Secured Party's interest therein shall be governed by the
     provisions of the Subordination Agreement (or other intercreditor letter as
     to Collateral held by LaSalle).

               (b) Other Documents and Actions. Debtors shall give, execute,
     deliver, file or record any financing statement, notice, instrument,
     agreement or other document that may be necessary or desirable in the
     reasonable judgment of Secured Party to create, preserve, perfect or
     validate the security interest granted pursuant hereto or to enable Secured
     Party to exercise and enforce the rights of Secured Party hereunder with
     respect to such security interest.

               (c) Books and Records. Debtors shall maintain at their own cost
     and expense complete and accurate books and records of the Collateral,
     including, without limitation, a record of all payments received and all
     credits granted with respect to the Collateral and all other dealings with
     the Collateral. Upon the occurrence and during the continuation of any
     Event of Default, Debtors shall deliver any such books

<PAGE>



     and records, or true and correct copies thereof, to Secured Party at any
     time on demand. Debtors shall permit any representative of Secured Party to
     inspect such books and records at any time during reasonable business hours
     and shall provide photocopies thereof at Debtors' expense to Secured Party
     upon the request of Secured Party.

               (d) Notice to Account Debtors; Verification. (i) Upon the
     occurrence and during the continuance of any Event of Default, upon request
     of Secured Party, Debtors shall promptly notify (and each Debtor hereby
     authorizes Secured Party so to notify) each Account Debtor in respect of
     any Accounts or Instruments that such Collateral has been assigned to
     Secured Party and that any payments due or to become due in respect of such
     Collateral are to be made directly to the party having a senior lien on a
     security interest in such collateral, and (ii) Secured Party shall have the
     right at any time or times to make direct verification with the Account
     Debtors of any and all of the Accounts.

               (e) Intellectual Property. If any Debtor shall (i) obtain rights
     to any patentable inventions, Copyrights, Patents or Trademarks not listed
     on Schedule 3, 4 or 5, or (ii) become entitled to the benefit of any
     Copyrights, Patents or Trademarks or any improvements on any Patent, the
     provisions of this Agreement shall automatically apply thereto and Debtor
     shall give Secured Party prompt written notice thereof. Each Debtor hereby
     authorizes Secured Party to modify this Agreement by amending Schedules 3,
     4 and 5, as applicable, to include any such Copyrights, Patents and
     Trademarks.

               (f) Further Identification of Collateral. Each Debtor shall, when
     and as often as reasonably requested by Secured Party, furnish to Secured
     Party, statements and schedules further identifying and describing the
     Collateral and such other reports in connection with the Collateral as
     Secured Party may reasonably request, all in reasonable detail.

               (g) Investment Property. The Investment Property will be held by
     LaSalle, and Secured Party's interest therein shall be governed by the
     provisions of the Subordination Agreement (or other intercreditor letter as
     to Collateral held by LaSalle).

               (h) Compliance with Loan Documents. Each Debtor shall comply with
     the provisions of the Loan Documents applicable to the Collateral,
     including, without limitation, maintenance of insurance, restrictions on
     dispositions and providing Secured Party the right to inspections with
     respect to the Collateral.

               (i) Other Liens. Each Debtor shall not create, permit or suffer
     to exist, and shall defend the Collateral against and take such other
     action as is necessary to remove, any Lien on the Collateral except
     Permitted Liens, and shall defend the right, title and interest of Secured
     Party in and to the Collateral and in and to all Proceeds thereof against
     the claims and demands of all Persons whatsoever.

               (j) Preservation of Rights. Whether or not any Event of Default
     has occurred or is continuing, Secured Party may, but shall not be required
     to, take any actions Secured Party reasonably deems necessary or
     appropriate to preserve any Collateral or any rights against third parties
     to any of the Collateral, including obtaining insurance on the Collateral
     at any time when Debtors has failed to do so, and each Debtor shall
     promptly pay, or reimburse Secured Party for, all expenses incurred in
     connection therewith.

               (k) Changes in Name; Location. Each Debtor shall notify Secured
     Party promptly in writing prior to any change in Debtor's name, identity or
     corporate structure or the proposed use by such Debtor of any trade name or
     fictitious business name other than any such name set forth on Schedule 2
     attached hereto. Each Debtor shall keep the Collateral at the locations
     specified in any Schedule 1 and shall give Secured Party 30

<PAGE>



     days' prior written notice of any change in any Debtor's chief place of
     business or of any new location for any of the Collateral.

               (l)  Intentionally Omitted

               (m) Collection of Accounts. Until notice from Secured Party to
     the contrary, given at any time after the occurrence and during the
     continuance of any Event of Default, each Debtor shall, at its own expense,
     endeavor to collect all amounts due with respect to any of the Accounts and
     shall take such action with respect to such collection as such Debtor may
     deem advisable.

               (n) Proceeds of Collateral. Subject to the provisions of the
     Subordination Agreement, upon demand therefor by Secured Party at any time
     following the occurrence and during the continuance of any Event of
     Default, each Debtor shall, forthwith upon receipt, transmit and deliver to
     Secured Party, in the form received, all cash, checks, drafts and other
     instruments or writings for the payment of money which may be received by
     Debtor at any time in payment or otherwise as proceeds of any Collateral.
     Any such items which may be so received by such Debtors shall not be
     commingled by Debtors with any of its other funds or property but, until
     delivery to Secured Party, shall be held separate and apart from such other
     funds and property and in trust for Secured Party.

          5. Remedies. Subject to the rights of any holders of Permitted Senior
     Indebtedness, and pursuant to the provisions of the Subordination
     Agreement, during the period during which an Event of Default shall have
     occurred and be continuing:

               (a) Secured Party shall have, in addition to other rights and
     remedies provided for herein or otherwise available to it, all of the
     rights and remedies of a Secured Party upon default under the Uniform
     Commercial Code (whether or not the Uniform Commercial Code applies to the
     affected Collateral) and Lender may, without notice, demand or legal
     process of any kind except as may be required by law, at any time or times
     (i) enter any Debtor's premises and take physical possession of the
     Collateral and maintain such possession on such Debtor's premises, at no
     cost to Lender, or remove the Collateral or any part thereof to such other
     place or places as Secured Party may desire, (ii) require any Debtor to,
     and such Debtor hereby agrees to, assemble the Collateral as directed by
     Secured Party and make it available to Secured Party at a place to be
     designated by Secured Party which is reasonably convenient to Secured Party
     and such Debtor and (iii) without notice except as specified below, sell,
     lease, assign, grant an option or options to purchase or otherwise dispose
     of the Collateral or any part thereof at public or private sale, at any
     exchange, broker's board or at any of the offices of Secured Party or
     elsewhere, for cash, on credit or for future delivery, and upon such other
     terms as Secured Party may deem commercially reasonable. Each Debtor agrees
     that, to the extent notice of sale shall be required by law, at least 10
     days' notice to such Debtor of the time and place of any public sale or the
     time after which any private sale is to be made shall constitute reasonable
     notification. Secured Party shall not be obligated to make any sale of
     Collateral regardless of notice of sale having been given. Secured Party
     may adjourn any public or private sale from time to time by announcement at
     the time and place fixed therefor and such sale may, without further
     notice, be made at the time and place to which it was so adjourned;

               (b) Secured Party may make any reasonable compromise or
     settlement deemed desirable with respect to any of the Collateral and may
     extend the time of payment, arrange for payment in installments or
     otherwise modify the terms of, any of the Collateral; and

               (c) Secured Party may, in the name of Secured Party or in the
     name of Debtor or otherwise, demand, sue for, collect or receive any money
     or property at any time payable or receivable on account of or in exchange

<PAGE>



     for any of the Collateral, but shall be under no obligation to do so.

          6. Deficiency; Application of Proceeds. If the proceeds of sale,
     collection or other realization of or upon the Collateral are insufficient
     to cover the costs and expenses of such realization and the payment in full
     of the Obligations, Company shall remain liable for any deficiency. Subject
     to the provisions of the Subordination Agreement, the proceeds of any
     collection, sale or other realization of all or any part of the Collateral
     shall be applied: first, to payment of all expenses payable or reimbursable
     by Company under the Debenture; second, to payment of all accrued unpaid
     interest on the Debenture; third, to payment of principal of the Debenture;
     fourth, to payment of any other amounts owing constituting Obligations; and
     last, any remainder shall be for the account of and paid to Company.

          7. Power of Attorney. Subject to the provisions of the Subordination
     Agreement, each Debtor hereby irrevocably constitutes and appoints Secured
     Party, with full power of substitution, as its true and lawful
     attorney-in-fact with full irrevocable power and authority in the place and
     stead of Debtor and in the name of Debtor or in its own name, from time to
     time in the discretion of Secured Party, for the purpose of carrying out
     the terms of this Agreement, to take any and all appropriate action and to
     execute and deliver any and all documents and instruments which may be
     necessary or desirable to accomplish the purposes of this Agreement and,
     without limiting the generality of the foregoing, hereby gives Secured
     Party the power and right, on behalf of Debtor, without notice to or assent
     by Debtor, to do the following upon the occurrence and during the
     continuance of an Event of Default:

               (a) to ask, demand, collect, receive and acquittance and receipts
     for any and all moneys due and to become due under any Collateral and, in
     the name of Debtor or its own name or otherwise, to take possession of and
     endorse and collect any checks, drafts, notices acceptances or other
     Instruments for the payment of moneys due under any Collateral and to file
     any claim or to take any other action or proceeding in any court of law or
     equity or otherwise deemed appropriate by Secured Party for the purpose of
     collecting any and all such moneys due under any Collateral whenever
     payable and to file any claim or to take any other action or proceeding or
     otherwise deemed appropriate by Secured Party for the purpose of collecting
     any and all such moneys due under any Collateral;

               (b) to pay or discharge charges or Liens levied or placed on or
     threatened against the Collateral, other than Permitted Liens, to effect
     any insurance required by the terms of the Credit Agreement and to pay all
     or any part of the premiums therefor;

               (c) to direct any party liable for any payment under any of the
     Collateral to make payment of any and all moneys due and to become due
     thereunder directly to Secured Party or as Secured Party may direct, and to
     receive payment of and receipt for any and all moneys, claims and other
     amounts due and to become due in respect of or arising out of any
     Collateral;

               (d) to sign and indorse any invoices, drafts against debtors,
     assignments, verifications and notices in connection with Accounts and
     other Documents constituting or relating to the Collateral;

               (e) to commence and prosecute any suits, actions or proceedings
     to collect the Collateral or any part thereof and to enforce any other
     right in respect of any Collateral;

               (f) to defend any suit, action or proceeding brought against
     Debtor with respect to any Collateral;

               (g) to settle, compromise or adjust any such suit, action or

<PAGE>



     proceeding as it relates to the Collateral and, in connection therewith, to
     give such discharges or releases as Secured Party may deem appropriate;

               (h) to communicate in its own name with any party to any Contract
     with regard to the assignment of the right, title and interest of Debtor in
     and under the Contracts hereunder and other matters relating thereto;

               (i) to execute, in connection with any sale of Collateral
     provided for in Section 5 hereof, any endorsements, assignments or other
     instruments of conveyance or transfer with respect to the Collateral; and

               (j) generally to sell, transfer, pledge, make any agreement with
     respect to or otherwise deal with any of the Collateral as fully and
     completely as though Secured Party were the absolute owner thereof for all
     purposes and to do, at Secured Party's option and at Debtor's expense, at
     any time or from time to time, all acts and things which Secured Party
     reasonably deems necessary to protect, preserve or realize upon the
     Collateral and Secured Party's Lien therein, in order to effect the intent
     of this Agreement, all as fully and effectively as Debtor might do.

     Each Debtor hereby ratifies, to the extent permitted by law, all actions
     that such attorneys lawfully take or cause to be taken by virtue hereof.
     The power of attorney granted hereunder is a power coupled with an interest
     and shall be irrevocable until the Obligations are indefeasibly paid in
     full and the Debenture, the PIK Debenture and the Cap Debentures are
     terminated.

          8. Termination. This Agreement and the Liens and security interests
     granted hereunder shall not terminate until the termination of the
     Debenture, the PIK Debenture and the Cap Debentures and the full and
     complete performance and indefeasible satisfaction of all Obligations
     (regardless of whether the Debenture, the PIK Debenture and the Cap
     Debentures shall have earlier terminated); provided, however, that Debtors
     may sell Collateral free and clear of the Lien and securities interests
     granted herein if (i) such sale is permitted by the holders of the
     Permitted Senior Indebtedness and (ii) such sale is a bona fide sale made
     to a third party that is not an affiliate of any Debtor or a holder of
     Permitted Senior Indebtedness. Upon the termination of this Agreement,
     Secured Party shall forthwith cause to be assigned, transferred and
     delivered free and clear of the Lien created herein, against receipt but
     without any recourse, warranty or representation whatsoever, any remaining
     Collateral to or on the order of Debtor.

          9. Further Assurances. At any time and from time to time, upon the
     request of Secured Party, and at the sole expense of Debtors, each Debtor
     shall promptly and duly execute and deliver any and all such further
     instruments, documents and agreements and take such further actions as
     Secured Party may reasonably require in order for Secured Party to obtain
     the full benefits of this Agreement, including, without limitation, using
     Debtor's best efforts to secure all consents and approvals necessary or
     appropriate for the assignment to Secured Party of any Collateral held by
     Debtors or in which each Debtors has any rights not heretofore assigned,
     the filing of any financing or continuation statements under the Uniform
     Commercial Code with respect to the Liens and security interests granted
     hereby, transferring Collateral to LaSalle's possession if a security
     interest in such Collateral can be perfected by possession, placing the
     interest of Secured Party as lienholder on the certificate of title of any
     motor vehicle and obtaining waivers of liens from landlords and mortgagees.
     Each Debtor further hereby authorizes Secured Party to file any such
     financing or continuation statement without the signature of Debtor to the
     extent permitted by law.

          10. Limitation on Duty of Secured Party. The powers conferred on
     Secured Party under this Agreement are solely to protect the Secured
     Party's interest in the Collateral and shall not impose any duty upon it

<PAGE>



     to exercise any such powers. Except for the safe custody of any Collateral
     in its possession and the accounting for moneys actually received by it
     hereunder, Secured Party shall have no duty as to any of the Collateral.
     Secured Party shall be accountable only for amounts that it actually
     receives as a result of the exercise of such powers and neither Secured
     Party nor any of their respective officers, directors, employees or agents
     shall be responsible to Debtor for any act or failure to act, except for
     gross negligence or willful misconduct. Without limiting the foregoing,
     Secured Party shall be deemed to have exercised reasonable care in the
     custody and preservation of the Collateral in its possession if such
     Collateral is accorded treatment substantially equivalent to that which
     Secured Party, in its individual capacity, accords its own property
     consisting of the type of Collateral involved, it being understood and
     agreed that Secured Party shall have no responsibility for taking any
     necessary steps, other than steps taken in accordance with the standard of
     care set forth above, to preserve rights against any Person with respect to
     any Collateral.

          11. Debtor to Remain Liable. Without limiting the generality of
     Section 10, Secured Party shall have no obligation or liability under any
     Contract or license by reason of or arising out of this Agreement or the
     granting to Secured Party of a security interest therein or assignment
     thereof or the receipt by Secured Party of any payment relating to any
     Contract or licence hereto, nor shall Secured Party be required or
     obligated in any manner to perform or fulfill any of the obligations of
     Debtor under or pursuant to any Contract or license, or to make any payment
     or to make any inquiry as to the nature or the sufficiency of any payment
     received by it or the sufficiency of any performance by any party under any
     Contract or license, or to present or file any claim, or to take any action
     to collect or enforce any performance or the payment of any amount which
     may have been assigned to it or to which it may be entitled at any time or
     times.

          12.  Miscellaneous.

               (a) No Waiver. No failure on the part of Secured Party to
     exercise, and no course of dealing with respect to, and no delay in
     exercising, any right, power or remedy hereunder shall operate as a waiver
     thereof, nor shall any single or partial exercise by Secured Party of any
     right, power or remedy hereunder preclude any other or further exercise
     thereof or the exercise of any other right, power or remedy. The rights and
     remedies hereunder provided are cumulative and may be exercised singly or
     concurrently, and are not exclusive of any rights and remedies provided by
     law.

               (b) Governing Law. This Agreement shall be governed by and
     construed in accordance with the laws of the State of Illinois, without
     giving effect to the choice of law principles thereof.

               (c) Notices. All notices, demands and requests that any party is
     required or elects to give to any other party shall be given in accordance
     with the provisions of the Debenture.

               (d) Amendments. The terms of this Agreement may be waived,
     altered or amended only by an instrument in writing duly executed by Debtor
     and Secured Party.

               (e) Successors and Assigns. This Agreement shall be binding upon
     and inure to the benefit of the respective successors and assigns of each
     of the parties hereto, provided, that Debtor shall not assign or transfer
     its rights hereunder without the prior written consent of Secured Party.

               (f) Counterparts; Headings. This Agreement may be executed in any
     number of counterparts, all of which together shall constitute one and the
     same instrument. The headings in this Agreement are for convenience

<PAGE>



     of  reference only  and shall not  alter or  otherwise affect  the meaning
     hereof.

               (g) Severability. If any provision hereof is invalid or
     unenforceable in any jurisdiction, then, to the fullest extent permitted by
     law, the other provisions hereof shall remain in full force and effect in
     such jurisdiction and shall be liberally construed in favor of Secured
     Party in order to carry out the intentions of the parties hereto as nearly
     as may be possible, and the invalidity or unenforceability of any provision
     in any jurisdiction shall not affect the validity or enforceability of such
     provision in any other jurisdiction.

               (h) Other Documents. This Agreement supplements the Debenture and
     nothing in this Agreement shall be deemed to limit or supersede the rights
     granted to Secured Party in any Debenture. If any item of Collateral
     hereunder also constitutes collateral granted to Secured Party under any
     other mortgage, agreement or instrument, in the event of any conflict
     between the provisions of this Agreement and the provision of such other
     mortgage, agreement or instrument, the provision or provisions selected by
     Secured Party shall control with respect to such Collateral. In the event
     of any conflict between any provision of this Agreement and any provision
     of the Debenture, the provisions of the Debenture shall control to the
     extent of such inconsistency.

               (i) Other Debentures. The Debenture is one of a duly authorized
     issuance of _________________ Dollars ($_________) aggregate principal
     amount of Subordinated Convertible Debentures of the Company referred to in
     the Securities Purchase Agreement dated April 14, 1999, among the Company
     and the initial Holders, each of which shall be secured by the Collateral.
     The lien and securities interests held by the Holders of each of the series
     of Debentures shall be held pro-rata regardless of the time of perfection
     or attachment of the Security interests.

          13. SUBMISSION TO JURISDICTION. EACH DEBTOR HEREBY IRREVOCABLY SUBMITS
     TO THE NON-EXCLUSIVE JURISDICTION OF ANY UNITED STATES FEDERAL OR ILLINOIS
     STATE COURT SITTING IN COOK COUNTY, ILLINOIS IN ANY ACTION OR PROCEEDING
     ARISING OUT OF OR RELATING TO THIS AGREEMENT AND IRREVOCABLY AGREES THAT
     ALL CLAIMS IN RESPECT OF SUCH ACTION OR PROCEEDING MAY BE HEARD AND
     DETERMINED IN ANY SUCH COURT AND IRREVOCABLY WAIVES ANY OBJECTION IT MAY
     NOW OR HEREAFTER HAVE AS TO THE VENUE OF ANY SUCH SUIT, ACTION OR
     PROCEEDING BROUGHT IN SUCH A COURT OR THAT SUCH COURT IS AN INCONVENIENT
     FORUM. NOTHING HEREIN SHALL LIMIT THE RIGHT OF SECURED PARTY TO BRING
     PROCEEDINGS AGAINST DEBTOR IN THE COURTS OF ANY OTHER JURISDICTION. ANY
     JUDICIAL PROCEEDING BY ANY DEBTOR AGAINST SECURED PARTY OR ANY AFFILIATE
     THEREOF INVOLVING, DIRECTLY OR INDIRECTLY, ANY MATTER IN ANY WAY ARISING
     OUT OF, RELATED TO, OR CONNECTION WITH THIS AGREEMENT SHALL BE BROUGHT ONLY
     IN A COURT SITTING IN COOK COUNTY, ILLINOIS.

          14. WAIVER OF JURY TRIAL. EACH DEBTOR AND SECURED PARTY EACH WAIVE
     THEIR RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY CLAIM OR CAUSE OF ACTION
     BASED UPON OR ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE
     TRANSACTIONS CONTEMPLATED HEREBY, IN ANY ACTION, PROCEEDING OR OTHER
     LITIGATION OF ANY TYPE BROUGHT BY ANY OF THE PARTIES AGAINST ANY OTHER
     PARTY OR PARTIES, WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS OR
     OTHERWISE. DEBT, LENDERS AND SECURED PARTY EACH AGREE THAT ANY SUCH CLAIM
     OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY. WITHOUT
     LIMITING THE FOREGOING, THE PARTIES FURTHER AGREE THAT THEIR RESPECTIVE
     RIGHT TO A TRIAL BY JURY IS WAIVED BY OPERATION OF THIS SECTION AS TO ANY
     ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART,
     TO CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THIS AGREEMENT OR THE OTHER
     LOAN DOCUMENTS OR ANY PROVISION HEREOF OR THEREOF. THIS WAIVER SHALL APPLY
     TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO
     THIS AGREEMENT.

                                      * * * * *

<PAGE>




          IN WITNESS WHEREOF, the parties have caused this Security Agreement to
     be duly executed and delivered as of the date first written above.

                                    DEBTORS:

                                   WESTELL TECHNOLOGIES, INC.


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


                                  WESTELL INC.


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



                                   WESTELL INTERNATIONAL, INC.


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



                                  SECURED PARTY


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



                                   SCHEDULE 1

                    FILING JURISDICTIONS AND COLLATERAL LOCATIONS


     FILING JURISDICTIONS



     COLLATERAL LOCATIONS




                                   SCHEDULE 2

                                      NAMES

<PAGE>



                                   SCHEDULE 3

                                   COPYRIGHTS



                                   SCHEDULE 4

                                     PATENTS




                                   SCHEDULE 5

                                   TRADEMARKS

     TRADEMARK REGISTRATIONS

     FEDERAL TRADEMARKS

     Mark                     Registration No.                   Date





     STATE TRADEMARKS

     Mark                     Registration No.                   Date






                             TRADEMARK APPLICATIONS


     Mark                Trademark Application No.               Date Applied

<PAGE>






                                  AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT


               THIS AMENDMENT TO LOAN AND SECURITY AGREEMENT (this "Amendment")
     is made as of February 24, 1999 by and between LASALLE NATIONAL BANK, its
     successors and assigns ("Bank"), WESTELL TECHNOLOGIES, INC. ("WTI"),
     WESTELL, INC. ("Westell"), WESTELL INTERNATIONAL, INC. ("International"),
     AND CONFERENCE PLUS, INC.  ("CPI"; WTI, Westell, International, and CPI
     are collectively referred to herein as "Borrowers").

                                   BACKGROUND

               A. Bank and Borrowers are parties to a Loan and Security
     Agreement dated as of October 13, 1998 (the "Loan Agreement"), pursuant to
     which Bank has made loans and advances to Borrowers.

               B. Borrowers have informed Bank that CPI has implemented a stock
     option plan (the "Stock Option Plan") pursuant to which it has authorized
     the granting of options to purchase up to 6,500 shares in the aggregate of
     its common stock to certain of its key employees, and actually granted
     6,250 options in accordance with the Stock Option Plan.

               C. Borrowers have requested that the parties enter into this
     Amendment in order to make certain modifications to the Loan Agreement in
     connection with the Stock Option Plan.

               D. Borrowers have also informed Bank that they were in violation
     of their maximum aggregate year-to-date net loss covenant for the
     nine-month reporting period ended December 31, 1998 and have requested that
     Bank waive such violation and any Events of Default created thereby, and
     have also requested that Bank amend their financial covenants.

               E. Bank is agreeable to making such modifications and granting
     such waiver on the terms and conditions contained herein.

               F. Terms used herein but not defined herein shall have the same
     meanings assigned to them in the Loan Agreement.

                                     CLAUSES

               NOW, THEREFORE, in consideration of the premises set forth above
     and the mutual promises contained in this Amendment, and for other good and
     valuable consideration, the receipt and sufficiency of which hereby are
     acknowledged, Borrowers and Bank agree as follows:

               SECTION 1 Amendments to Loan Agreement. The Loan Agreement is
     hereby amended as follows:

               1.1 Section 1.1 of the Loan Agreement is hereby amended by
     inserting the following new definition in its appropriate alphabetical
     position:

               "CPI Stock Option Plan" means the plan adopted on November 3,
               1998 authorizing the granting by CPI to key employees of up to
               6,500 options to purchase CPI's common stock, and shall include
               all agreements entered into in connection with the granting of
               any option."

               1.2 Section 5.16 is hereby amended by inserting the phrase
     ",except in connection with the Stock Option Plan" in the twenty first line
     thereof after the word "Borrower".

               1.3 Section 6.1(b) of the Loan Agreement is hereby amended and
     restated in its entirety as follows:

<PAGE>



     "6.1 (b)  Financial Covenants.  The Borrowers shall maintain:

               (i) a maximum aggregate year-to-date (net loss)/ minimum net
               income (exclusive of extraordinary income and losses) for the
               interim periods ending on the dates set forth below in the
               amounts set forth below;

                   End of Period       (Net Loss)/Net Income
                      3/31/99             ($35,000,000)
                      6/30/99              ($5,000,000)
                      9/30/99              ($5,000,000)
                     12/31/99              ($3,000,000)
                      3/31/00               $1,000,000 
                      6/30/00               $1,000,000 
                      9/30/00               $2,000,000 
                     12/31/00               $3,000,000 
                      3/31/01               $4,000,000 
                      6/30/01               $1,000,000 
                      9/30/01               $2,000,000 
                     12/31/01               $3,000,000 
                      3/31/02               $4,000,000 
                      6/30/02               $1,000,000 

               (ii) at all times, a Leverage Ratio of not more than 1.35:1.0,
               measured on a monthly basis; and

               (iii) at all times, a Current Ratio of not less than 1.45:1,
               measured on a monthly basis."

               1.4 Section 6.2(e) of the Loan Agreement is hereby amended by
     inserting the following at the end thereof: ", and in accordance with the
     terms of the Stock Option Plan requiring the redemption by CPI of the
     shares of its stock under the circumstances set forth therein".

               1.5 Section 6.2 of the Loan Agreement is hereby amended by
     inserting the following new Section 6.2(p) at the end thereof:

               "6.2 (p)  Ownership of CPI.  WTI shall at all times own,
               beneficially and of record at least fifty-one percent (51%) of
               the issued and outstanding stock of CPI."

               1.6 Schedule 5.16 of the Loan Agreement is hereby amended and
     restated in its entirety in the form of Exhibit A hereto.

               SECTION 2 Waiver. Bank hereby waives Borrowers' failure to be in
     compliance with their Maximum Aggregate Year-to-Date Net Loss covenant as
     of December 31, 1998 as evidenced by a waiver letter dated February 11,
     1999, and any Events of Default created thereby solely as of December 31,
     1998. This shall be a limited waiver and shall not constitute a waiver of
     any subsequent violations whether of a different or like nature, nor shall
     it constitute a course of conduct or dealing

               SECTION 3 Representations and Warranties. To induce Bank to amend
     the Loan Agreement and consider making future loans thereunder, the
     Borrowers represent and warrant to Bank that:

               3.1 Compliance with Loan Agreement. On the date hereof, Borrowers
     are in compliance with all of the terms and provisions set forth in the
     Loan Agreement (as modified by this Amendment) and no Event of Default
     specified in Section 7 of the Loan Agreement nor any event which, upon
     notice or lapse of time, or both, would constitute such an Event of
     Default, has occurred.

               3.2 Representations and Warranties. On the date hereof, the
     representations and warranties and covenants set forth in Sections 5 and 6
     of the Loan Agreement (as modified by this Amendment) are true and correct

<PAGE>



     with the same effect as though such representations and warranties and
     covenants had been warranties and covenants expressly related to an earlier
     date, except as disclosed to the Bank on January 19, 1999 that the
     cumulative net loss at December 31, 1998 exceeded $28,000,000 by $2,500,000
     due to unanticipated forward pricing of DSL Systems.

               3.3 Corporate Authority. Borrowers have full power and authority
     to enter into this Amendment, to make the borrowings under the Loan
     Agreement as amended by this Amendment, and to incur and perform the
     obligations provided for under the Loan Agreement and this Amendment, all
     of which have been duly authorized by all proper and necessary corporate
     action. No consent or approval of stockholders or of any public authority
     or regulatory body is required as a condition to the validity or
     enforceability of this Amendment.

               3.4 Amendment as Binding Agreement. This Amendment constitutes
     the valid and legally binding obligation of Borrowers, fully enforceable
     against Borrowers, in accordance with its terms.

               3.5 No Conflicting Agreements. The execution and performance by
     Borrowers of this Agreement will not (i) violate any provision of law, any
     order of any court or other agency of government, or the Articles of
     Incorporation or By-Laws of Borrowers, or (ii) violate any indenture,
     contract, agreement or other instrument to which any Borrower is a party,
     or by which its property is bound, or be in conflict with, result in a
     breach of or constitute (with due notice and/or lapse of time) a default
     under any such indenture, contract, agreement or other instrument or result
     in the creation or imposition of any lien, charge or encumbrance of any
     nature whatsoever upon any of the property or assets of any Borrower.

               SECTION 4 Condition Precedent. The agreement by Bank to amend the
     Loan Agreement is subject to the following condition precedent:

               4.1 Corporate Authority. Borrowers shall have provided to Bank
     certified copies of the unanimous written consent of their Boards of
     Directors authorizing the execution, delivery and performance by the
     Borrowers of this Amendment and the agreements, instruments and documents
     executed in connection herewith.

               SECTION 5 General Provisions.

               5.1 Except as amended by this Amendment, the terms and provisions
     of the Loan Agreement shall remain in full force and effect and are in all
     other respects ratified and confirmed.

               5.2 This Amendment shall be construed in accordance with and
     governed by the laws of the State of Illinois.

               5.3 This Amendment may be executed in any number of counterparts.

               5.4 Borrowers hereby agree to pay all out-of-pocket expenses
     incurred by Bank in connection with the preparation, negotiation and
     consummation of this Amendment, and all other documents related thereto
     (whether or not any borrowings under the Loan Agreement as amended shall be
     consummated), including, without limitation, the reasonable fees and
     expenses of Bank's counsel, and any filing fees required in connection with
     the filing of any documents necessary to consummate the provisions of this
     Amendment.



                    (Remainder of page intentionally left blank)

               IN WITNESS WHEREOF, the Borrowers have caused this Amendment to
     be duly executed by their duly authorized officers and Bank has caused

<PAGE>



     this Amendment to be executed by its duly authorized officer, all as of the
     day and year first above written.

                                   WESTELL TECHNOLOGIES, INC.
                                   a Delaware corporation

                                   By:
                                     Title:


                                  WESTELL, INC.
                                   a Delaware corporation

                                   By:
                                     Title:


                                   WESTELL INTERNATIONAL, INC.
                                   a Delaware corporation

                                   By:
                                     Title:


                                   CONFERENCE PLUS, INC. 
                                   an Illinois corporation

                                   By:
                                     Title:


                                   LASALLE NATIONAL BANK 


                                   By:
                                     Title:



     Exhibit A to Amendment

                                  Schedule 5.16

                                  See attached.

<PAGE>





                               SECOND AMENDMENT TO
                           LOAN AND SECURITY AGREEMENT


          THIS   SECOND  AMENDMENT   TO  LOAN   AND  SECURITY   AGREEMENT  (this
"Amendment") is made as of April __, 1999 by and between LASALLE  NATIONAL BANK,
its  successors  and  assigns  ("Bank"),  WESTELL  TECHNOLOGIES,  INC.  ("WTI"),
WESTELL, INC.  ("Westell"), WESTELL INTERNATIONAL,  INC. ("International"),  AND
CONFERENCE  PLUS, INC.    ("CPI").  WTI,  Westell,  International  and  CPI  are
collectively referred to herein as "Borrowers".

                                   BACKGROUND

          A. Bank and Borrowers are parties to a Loan and Security Agreement
dated as of October 13, 1998, as amended as of February 24, 1999 (the "Loan
Agreement"), pursuant to which Bank has made loans and advances to Borrowers.

          B. Borrowers have informed Bank that WTI desires to enter into a
Securities Purchase Agreement (the "SPA") with certain "Purchasers" (as defined
in the SPA) and, in conjunction therewith (i) to sell and issue to Purchasers
certain "Debentures" and "Warrants" (both as defined in the SPA), and (ii) to
enter into a Registration Rights Agreement (as defined in the SPA) with
Purchasers. Borrowers jointly and severally represent and warrant to Bank that
they have attached hereto, as Exhibit A, true and correct copies of the SPA, the
Warrants, the Debentures and the Registration Rights Agreement (as well as any
other documents or instruments being executed and/or issued in connection
therewith).

          C. Borrowers have agreed, as an inducement to Bank entering into this
Amendment, that the obligations of Borrowers to Purchasers under the SPA and
related documents, as well as any security granted to Purchasers by Borrowers
with respect thereto, shall be subject, subordinate and junior to the
Obligations as set forth in the form of Subordination Agreement attached hereto
as Exhibit B (the "Subordination Agreement").

          D. Borrowers have requested that the parties enter into this Amendment
in order to make certain modifications to the Loan Agreement in connection with
the execution of the Subordinate Documents (as defined in the Subordination
Agreement).

          E. Borrowers have also requested that Bank amend certain of the
financial covenants set forth in the Loan Agreement.

          F. Bank is agreeable to making such modifications on the terms and
conditions contained herein.

          G. Terms used herein but not defined herein shall have the same
meanings assigned to them in the Loan Agreement.

                                     CLAUSES

          NOW, THEREFORE, in consideration of the premises set forth above and
the mutual promises contained in this Amendment, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Borrowers and Bank agree as follows:

          SECTION 1 Amendments to Loan Agreement. The Loan Agreement is hereby
amended as follows:

          1.1 Section 1.1 of the Loan Agreement is hereby amended by inserting
the following new definitions in their appropriate alphabetical position:

          "'Debentures' means those certain 6% Subordinated Convertible
          Debentures dated April , 1999 issued by WTI to Purchasers in the
          aggregate principal amount of $20,000,000."

<PAGE>



          "'SPA' means that certain Securities Purchase Agreement dated as of
          April , 1999 between WTI and Purchasers."

          "'Purchasers'  means  Castle Creek  Technology Partners  LLC, Marshall
          Capital Management, Inc., and Capital Ventures International.

          "'Registration Rights Agreement' means that certain Registration
          Rights Agreement dated April , 1999 between WTI and Purchasers."

          "'Subordination Agreement' means that certain Subordination Agreement
          dated April , 1999 by Purchasers in favor of the Bank."

          "'Warrants' means those certain Stock Purchase Warrants dated April ,
          1999 issued by WTI to Purchasers."

          1.2 The definition of "Permitted Liens" is hereby amended by adding
the following new clause (viii):

               "(viii) liens granted to Purchasers in the personal property
          assets of WTI, Westell and International to secure (and only secure)
          the obligations of WTI under the Debentures and which are subject,
          subordinate and junior to the rights of Bank in and to the Collateral
          pursuant to the Subordination Agreement."

          1.3 Section 6.1(b) of the Loan Agreement is hereby amended and
restated in its entirety as follows:

          "6.1 (b)  Financial Covenants.  Borrowers shall maintain:

          (i) a maximum aggregate fiscal year-to-date (net loss)/ minimum net
          income (exclusive of extraordinary income and losses) for the interim
          periods ending on the dates set forth below in the amounts set forth
          below;

                 End of Period     (Net Loss)/Net Income
                    3/31/99           ($35,000,000)
                    6/30/99           ($ 5,000,000)
                    9/30/99           ($ 7,000,000)
                   12/31/99           ($ 7,500,000)
                    3/31/00           ($ 9,000,000)
                    6/30/00           ($ 1,000,000)
                    9/30/00           ($ 1,500,000)
                   12/31/00           ($ 2,000,000)
                    3/31/01           ($ 2,000,000)
                    6/30/01            $ 1,000,000 
                    9/30/01            $ 2,000,000 
                   12/31/01            $ 3,000,000 
                    3/31/02            $ 4,000,000 
                    6/30/02             $1,000,000 

          (ii) at all times, a Leverage Ratio of not more than 1.2:1.0, measured
          on a monthly basis; and

          (iii) at all times, a Current Ratio of not less than 1.8:1.0, measured
          on a monthly basis."

          1.4 Section 6.1(c) of the Loan Agreement is hereby amended by
inserting the following clause (xv) at the end thereof:

               "(xv) All information and notices provided or given by any
          Borrowers or any of their Affiliates to Purchasers, simultaneously
          with the transmittal thereof to Purchasers."

          1.5 Section 7.6 of the Loan Agreement is hereby amended and restated
in its entirety as follows:

<PAGE>



          "7.6 Material Agreements.  If: (a) any Borrower defaults, or a default
          or an  event of  default occurs,  under or in  the performance  of any
          material agreement, document or instrument, whether for borrowed money
          or  otherwise, and such default, breach, or event of default continues
          beyond  any applicable grace period thereunder and the effect of which
          shall be to cause  the holder of such obligation,  agreement, document
          or instrument, or the person to whom such obligation is  owed to cause
          such  obligation to  become  due  prior  to  its  stated  maturity  or
          otherwise accelerated; or (b)  there occurs an Event of  Failure under
          any of the Debentures and any "Holder" (as such term is defined in the
          Debentures) delivers to WTI a "Demand Redemption Notice" (as such term
          is  defined  in  the Debentures)  in  accordance  with  the terms  and
          provisions of the Debentures."

          1.6 Schedule 5.16 of the Loan Agreement is hereby amended and restated
in its entirety in the form of Exhibit C hereto.

          SECTION 2 Approval. Bank hereby approves (a) WTI's entering into the
SPA and the Registration Rights Agreement, and (b) WTI's issuance of the
Debentures and the Warrants. Such approval, however, does not extend to any
actions, transactions, circumstances or events which may occur or transpire
after the date hereof pursuant to, under or in connection with any of the
foregoing documents and which may constitute breaches, failures or defaults
under the Loan Agreement.

          SECTION 3 Representations and Warranties. To induce Bank to amend the
Loan Agreement and consider making future loans thereunder, Borrowers jointly
and severally represent and warrant to Bank that:

          3.1 Compliance with Loan Agreement. On the date hereof, Borrowers are
in compliance with all of the terms and provisions set forth in the Loan
Agreement (as modified by this Amendment) and no Event of Default specified in
Article VII of the Loan Agreement (as modified by this Amendment) nor any event
which, upon notice or lapse of time, or both, would constitute such an Event of
Default, has occurred.

          3.2 Representations and Warranties. On the date hereof, the
representations and warranties and covenants set forth in Articles V and VI of
the Loan Agreement (as modified by this Amendment) are true and correct with the
same effect as though such representations and warranties and covenants had been
warranties and covenants expressly related to an earlier date.

          3.3 Corporate Authority. Borrowers have full power and authority to
enter into this Amendment, to make the borrowings under the Loan Agreement as
amended by this Amendment, and to incur and perform the obligations provided for
under the Loan Agreement and this Amendment, all of which have been duly
authorized by all proper and necessary corporate action. No consent or approval
of stockholders or of any public authority or regulatory body is required as a
condition to the validity or enforceability of this Amendment.

          3.4 Amendment as Binding Agreement. This Amendment constitutes the
valid and legally binding obligation of Borrowers, and is fully enforceable
against Borrowers in accordance with its terms.

          3.5 No Conflicting Agreements. The execution and performance by
Borrowers of this Agreement will not (i) violate any provision of law, any order
of any court or other agency of government, or the Articles of Incorporation or
By-Laws of any Borrowers, or (ii) violate any indenture, contract, agreement or
other instrument to which any Borrower is a party, or by which its property is
bound, or be in conflict with, result in a breach of or constitute (with due
notice and/or lapse of time) a default under any such indenture, contract,
agreement or other instrument or result in the creation or imposition of any
lien, charge or encumbrance of any nature whatsoever upon any of the property or
assets of any Borrower.

          SECTION 4 Conditions  Precedent.  The  agreement by Bank  to amend the

<PAGE>



Loan Agreement is subject to the following conditions precedent:

          4.1 Corporate Authority. Borrowers shall have provided to Bank
certified copies of the unanimous written consent of their respective Boards of
Directors authorizing the execution, delivery and performance by Borrowers of
this Amendment and the agreements, instruments and documents executed in
connection herewith.

          4.2  Subordination  Agreement.   Borrowers and  Purchasers shall  have
executed and delivered to Bank the Subordination Agreement.

          4.3 Stock Pledge Agreement. WTI shall have executed and delivered to
Bank a Stock Pledge Agreement satisfactory to Bank in form and substance,
granting to Bank a lien on and security interest in all of the issued and
outstanding shares of Westell, International, and Schoolhouse Interactive, Inc.

          SECTION 5 General Provisions.

          5.1 Except as amended by this Amendment, the terms and provisions of
the Loan Agreement shall remain in full force and effect and are in all other
respects ratified and confirmed.

          5.2 This Amendment shall be construed in accordance with and governed
by the laws of the State of Illinois.

          5.3 This Amendment may be executed in any number of counterparts.

          5.4 Borrowers hereby agree to pay all out-of-pocket expenses incurred
by Bank in connection with the preparation, negotiation and consummation of this
Amendment, and all other documents related thereto (whether or not any
borrowings under the Loan Agreement as amended shall be consummated), including,
without limitation, the reasonable fees and expenses of Bank's counsel, and any
filing fees required in connection with the filing of any documents necessary to
consummate the provisions of this Amendment.


                  (Remainder of page intentionally left blank)



          IN WITNESS WHEREOF, Borrowers have caused this Amendment to be duly
executed by their duly authorized officers and Bank has caused this Amendment to
be executed by its duly authorized officer, all as of the day and year first
above written.


WESTELL INTERNATIONAL, INC.             WESTELL TECHNOLOGIES, INC.
a Delaware corporation                  a Delaware corporation

By:                                     By:
Title:                                  Title:


CONFERENCE PLUS, INC.                   WESTELL, INC.
an Illinois corporation                 a Delaware corporation

By:                                     By:
Title:                                  Title:


                                        LASALLE NATIONAL BANK 

                                       By:
                                     Title:

<PAGE>






                             SUBORDINATION AGREEMENT


               This Subordination Agreement ("Agreement"), dated as of April 15,
     1999, is entered into by and between Castle Creek Technology Partners LLC,
     Marshall Capital Management, Inc., and Capital Ventures International (all
     such entities collectively, the "Holders", and individually, a "Holder")
     and LaSalle National Bank, a national banking association, and its
     successors and assigns (the "Bank").

                                W I T N E S S E T H:

               WHEREAS, the Holders desire to enter into a Securities Purchase
     Agreement, (the "SPA") with Westell Technologies, Inc., a Delaware
     corporation ("WTI") and various other documents and instruments in
     conjunction therewith (collectively with the SPA, the "Subordinate
     Documents"), including certain 6% Subordinated Convertible Debentures
     issued by WTI (each, a "Debenture" and collectively, the "Debenture"), a
     Stock Purchase Warrant ("Warrant") and a Registration Rights Agreement (the
     "Registration Rights Agreement"). Each Holder represents and warrants that
     it has attached hereto, as Exhibit A, true and correct copies of all the
     Subordinate Documents.

               WHEREAS, WTI, Westell, Inc., Westell International, Inc.
     (collectively, the "Pledging Borrowers") and Conference Plus, Inc.
     (Conference Plus, together with the Pledging Borrowers, collectively, the
     "Borrowers") and the Bank are parties to that certain Loan and Security
     Agreement dated as of October 13, 1998 (as the same was amended by
     Amendments to Loan and Security Agreement dated as of February 24, 1999 and
     April 15, 1999, and as the same may be amended, modified or restated from
     time to time hereafter, the "Loan Agreement"), pursuant to which the Bank
     has made and may continue to make loans and advances to the Borrowers and
     issue letters of credit for the account of the Borrowers ("Letters of
     Credit"). Capitalized terms not otherwise defined herein shall have the
     meanings ascribed to them in the Loan Agreement.

               WHEREAS, the Loan Agreement provides that the Subordinate
     Documents may only be executed, delivered and/or issued if this
     Subordination Agreement is executed for the benefit of the Bank.

               NOW, THEREFORE, for good and valuable consideration, receipt and
     sufficiency of which are hereby acknowledged by the Holders, and in order
     to induce the Bank to continue to make loans and issue Letters of Credit
     under the Loan Agreement, and to better secure the Bank in respect of the
     foregoing, each Holder individually and severally agrees with the Bank as
     hereinafter set forth.

               1. Standby; Subordination. Except for "Permitted Payments" (as
     hereinafter defined) and for the exercise of rights as set forth in Section
     4 hereof, all "Subordinated Debt" (as defined below) is hereby subordinated
     to all the "Senior Debt" (as defined below), and each Holder agrees that
     the Holder will not ask, demand, sue for, take or receive from any of the
     Borrowers, by setoff or in any other manner, the whole or any part of any
     monies which may now or hereafter be owing by any of the Borrowers,
     including without limitation, monies owing by WTI under any of the
     Subordinate Documents, or any successor or assign of any of the Borrowers,
     including, without limitation, a receiver, trustee or debtor in possession
     (the term "Borrowers" hereinafter shall include any such successor or
     assign of any of the Borrowers), to any Holders or be owing by any other
     person, firm, partnership or corporation for the benefit of any of the
     Borrowers, including, without limitation, the taking of any negotiable
     instruments evidencing such amounts (all such indebtedness, obligations and
     liabilities being hereinafter referred to as the "Subordinated Debt"),
     unless and until all Obligations, whether now existing or hereafter
     arising, including, without limitation, the undrawn face amount of all
     Letters of Credit, shall have been fully paid and

<PAGE>



     satisfied with interest (all such Obligations, indebtedness and liabilities
     of the Borrowers to the Bank are hereinafter referred to as the "Senior
     Debt"), and all obligations of the Bank existing pursuant to the Loan
     Agreement to advance funds have been terminated; provided, however, that
     notwithstanding anything in this Agreement to the contrary, Holders may at
     all times (A) receive, retain and take action to obtain (i) shares of
     Series A Common Stock upon conversion of the Debentures, as interest on the
     Debentures or otherwise in accordance with the terms of the Debentures,
     (ii) Cap Debentures (as defined in the Debentures) issued pursuant to the
     Debentures, and Debentures in exchange for the Cap Debentures, in
     accordance with the terms of the Cap Debentures and (iii) PIK Debentures
     (as defined in the Debentures) issued pursuant to the Debentures, and
     Holder shall not be deemed to have transferred to the Bank any rights or
     agreed to take any actions with respect to the foregoing; and (B) Holders
     may seek specific enforcement of WTI's nonmonetary obligations under the
     Subordinate Documents (subject however, to Section 4 with respect to
     Collateral).

               2. Permitted Payments. Any other terms and provisions of this
     Agreement regarding payment of the Subordinated Debt notwithstanding, the
     Holders shall be entitled to accept from WTI and retain for their own
     account the following payments (collectively, the "Permitted Payments"):

               (i) payments to be made pursuant to Section 7.5 of the Debentures
     (for a period not to exceed thirty (30) days and in an amount equal to one
     percent (1%) per day of the aggregate principal amount on the Debentures);

               (ii) payments of principal and accrued and unpaid interest on the
     Debentures on their "Scheduled Maturity Date" (as such term is defined in
     the Debenture);

               (iii) payments of principal and accrued and unpaid interest on
     the Cap Debentures on the maturity of the Cap Debentures in accordance with
     their terms;

               (iv) payments of interest under the Debentures (including
     interest payments pursuant to Section 10.2 of the Debenture); and

               (v) Conversion Default Payments (as defined in the Debenture),
     pursuant to Section 6.1 of the Debentures, any required payments pursuant
     to Section 6.2 of the Debentures, any required payments pursuant to Section
     8.3 of the Debentures, any required payments pursuant to Section 8.9 of the
     Debentures, any required payments pursuant to Section 2.3 of the
     Registration Rights Agreement, and any required payments pursuant to
     Sections 1(e) and 4(e) of the Warrant,

     in each case (a) if no Event of Default has occurred and is continuing
     under the Loan Agreement, (b) if the making of such Permitted Payment would
     not result in a breach of any of the covenants contained in Section 6.1(b)
     of the Loan Agreement as in effect on the date hereof and measured as if
     such payments had been made at the end of the immediately preceding
     calendar month, and (c) if prior to the delivery of a "Demand Redemption
     Notice" (as such term is defined in the Debentures) (collectively, the
     circumstances described in clauses (a), (b) and (c) are sometimes referred
     to as a "Payment Blockage Event"). No Payment Blockage Event shall have
     occurred under clauses (a) or (b) above until the receipt of notice by the
     Holders of the occurrence of a Payment Blockage Event described in clause
     (a) or (b). Further, notwithstanding the foregoing, so long as no Payment
     Blockage Event would be caused by any such resumed payment, then WTI may
     resume making to the Holders and Holders may resume accepting from WTI, the
     Permitted Payments as and when such payments are due and payable in the
     ordinary course under the Subordinate Documents, and further, as provided
     below, payments missed during the occurrence of a Payment Blockage Event,
     may be resumed upon the earlier to occur of the following:

<PAGE>



               (i)  the date on which  no Payment Blockage Event  is occurring;
     and

               (ii) unless Bank has accelerated the maturity of the Obligations
     under the Loan Agreement, or there has a occurred a "Bankruptcy Event" (as
     such term is defined in the Debenture), the date that is sixty (60)
     calendar days after the occurrence of the most recent Payment Blockage
     Event.

     In the event that subsequent to a Payment Blockage Event or the resumption
     of payments to the Holders as provided above, Bank accelerates the maturity
     of the Obligations, then WTI shall not pay and the Holders shall not accept
     further payments of the Subordinated Debt until the Senior Debt is paid in
     full or such acceleration is rescinded by Bank. For purposes of
     clarification, it is expressly agreed by Bank that neither Permitted
     Payments nor any of the events giving rise thereto shall constitute, of
     themselves, Events of Default under the Loan Agreement.

               3.   Lien Priority.

               (a) The Holders hereby acknowledge and agree that Borrowers have
     granted to Bank an unconditional and continuing security interest in all of
     Borrowers' assets and property (collectively, the "Bank Liens") and that
     the Bank Liens are and will be senior to the lien of the Holders. Bank
     hereby acknowledges that Pledging Borrowers have granted to Holders a
     junior lien on and security interest in all of Pledging Borrowers' assets
     and property (the "Holder Liens").

               (b) Irrespective of the time or order of attachment or perfection
     of the Holder Liens and the Bank Liens, or the recording or filing of any
     deeds of trust, financing statements or other documents or instruments
     related thereto, with respect to the assets of Borrowers, the Holder Liens
     thereon in all respects and at all times are and will be subject,
     subordinate and junior to the Bank Liens thereon to the extent of the
     Senior Debt. Holders shall not contest the existence, validity, perfection
     or priority of the Bank Liens and shall hold any Collateral coming into
     their possession, as agents on behalf of Bank for purposes of perfecting
     the Bank Liens.

               4. Standstill. Except as expressly provided in this Section 4,
     until all of the Senior Debt is fully paid (unconditionally and
     indefeasibly) and all obligations of the Bank to advance funds to the
     Borrower under the Loan Agreement have been terminated, the Holder will not
     take any action to enforce any rights or remedies under any of the
     Subordinate Documents other than (to the extent appropriate) declaring an
     Event of Failure under the Debenture and accelerating the Subordinated Debt
     by delivering a Demand Redemption Notice. Without limiting the generality
     of the foregoing, this standstill agreement includes, without, limitation,
     any rights the Holders may have to exercise setoff, to initiate or
     otherwise prosecute any litigation, arbitration, or mediation of any sort,
     to commence foreclosure proceedings, to exercise self-help remedies or to
     participate in the commencement of any involuntary bankruptcy or other
     similar proceedings with respect to the Pledging Borrowers or any of their
     assets, but shall not prohibit Holders from filing proofs of claim with
     respect to the Subordinated Debt in any insolvency proceeding of Pledging
     Borrowers. Notwithstanding the foregoing, so long as Bank has not
     accelerated the maturity of the Obligations and initiated enforcement
     action against Borrowers within thirty (30) days following notice from the
     Holders to the holders of the Senior Debt of an Event of Failure under the
     Debenture with respect to which the Holder has delivered a Demand
     Redemption Notice, Holders may, upon the expiration of thirty (30) days
     following notice from the Holders to the holders of such Senior Debt of an
     Event of Failure under the Debenture with respect to which the Holder has
     delivered a Demand Redemption Notice, initiate and take enforcement under
     the Subordinate Documents consistent with the following provisions of this
     Section 4. In

<PAGE>



     addition, if Bank has accelerated the maturity of the Obligations and
     initiated enforcement action against Borrowers within such thirty (30) day
     period, but after such thirty day period ceases to be pursuing enforcement
     actions in a manner which, in its reasonable determination, is intended to
     result in realization on the Collateral, then Holders may initiate and take
     enforcement under the Subordinate Documents consistent with the following
     provisions of this Section 4. If any Holder takes any remedial actions
     under the Subordinate Documents, as permitted by this Section 4, then such
     actions must nevertheless be consistent with and remain subject to the
     provisions of Section 3 hereof (Lien Priority) and Section 6 (Bank's
     Priority; Grant of Authority to the Bank) and Section 7 (Payments Received
     by the Holders). If Bank declares any Event of Default, which also
     constitutes an Event of Failure under the Subordinate Documents, and Bank
     subsequently waives such Event of Default, then, to the extent that such
     default does not constitute a "Greater Failure" (as such term is defined in
     the Debenture), the Holder shall rescind any Holder Demand Redemption
     Notice, but may receive the Default Alternative Payment under Section 7.5
     of the Debenture. If at any time, Bank accelerates the maturity of the
     Obligations, initiates, and is pursuing enforcement actions in a manner
     which, in its reasonable determination, is intended to result in
     realization on the Collateral, then the Holders shall, if any Holders have
     initiated enforcement action to realize on the Collateral as permitted by
     this Section 4, cease such action; provided, that such Holder may intervene
     in any legal proceedings instituted by Bank against Pledging Borrowers and
     shall cooperate with Bank in the enforcement of Bank's rights and remedies.
     Nothing contained in this Section 4 or otherwise in this Agreement shall
     prohibit a Holder from pursuing and obtaining for its benefit injunctive or
     equitable relief (except with respect to the Collateral) or a judgement on
     account of any Subordinated Debt, provided that no monetary judgement may
     be enforced except in accordance with this Section 4.

               5. Subordinated Debt Owed Only to the Holders. Each Holder
     individually and severally warrants and represents to the Bank that, as of
     the date hereof, the Holder has not previously assigned any interest in the
     Subordinated Debt issued to such Holder, including, without limitation, any
     Subordinated Debt evidenced by any of the Subordinate Documents, held by
     such Holder or any security interest in connection therewith, that no other
     party owns an interest in any Subordinated Debt issued to such Holder or
     security therefor (whether as joint holders of Subordinated Debt,
     participants or otherwise) and that the entire Subordinated Debt issued to
     such Holder is owing only to such holder. Each Holder individually and
     severally covenants that the entire Subordinated Debt issued to such Holder
     shall continue to be owing only to such the Holder and all security
     therefor, if any, shall continue to be held solely for the benefit of such
     Holder unless assigned expressly subject to the terms of this Agreement.

               6. Bank's Priority; Grant of Authority to the Bank. In the event
     of any distribution, division, or application, partial or complete,
     voluntary or involuntary, by operation of law or otherwise, of all or any
     part of the assets of any of the Borrowers or any of the proceeds thereof
     to the creditors of any of the Borrowers or readjustment of the Senior Debt
     and Subordinated Debt of any of the Borrowers, whether by reason of
     liquidation, bankruptcy, arrangement, receivership, assignment for the
     benefit of creditors or any other action or proceeding involving the
     readjustment of all or any part of the Subordinated Debt, or the
     application of any assets of any of the Borrowers to the payment or
     liquidation thereof, or upon the dissolution or other winding up of any
     Borrower's businesses, or upon the sale of all or substantially all of any
     Borrower's assets, then and in such event (i) the Bank shall be entitled to
     receive payment in full of any and all of the Senior Debt prior to the
     payment of all or any part of the Subordinated Debt and (ii) any payment or
     distribution of any kind or character, whether in cash, securities (other
     than stock of WTI and securities subordinated to the Bank consistent with
     the terms hereof) or other property, which shall be

<PAGE>



     payable or deliverable upon or with respect to any or all of the
     Subordinated Debt shall be paid or delivered directly to the Bank for
     application on any of the Senior Debt, due or not due, until such Senior
     Debt shall have first been fully paid and satisfied, prior to the payment
     of the Subordinated Debt. In order to enable the Bank to enforce its rights
     hereunder in any of the aforesaid actions or proceedings, the Bank is
     hereby irrevocably authorized and empowered, in its discretion, to make and
     present for and on behalf of the undersigned such proofs of claims against
     any of the Borrowers on account of any of the Subordinated Debt as the Bank
     may deem expedient or proper and to vote such proofs of claims in any such
     proceeding and to receive and collect any and all dividends or other
     payments or disbursements made thereon in whatever form the same may be
     paid or issued, and to apply the same on account of any of the Senior Debt.
     The Holders irrevocably authorize and empower the Bank, upon any Holder's
     failure to take such action within thirty (30) days of written request by
     the Bank, to demand, sue for, collect and receive each of the aforesaid
     payments and distributions and give acquittance therefor and to file claims
     and take such other actions in the Bank's own name or in the name of any of
     the Holders or otherwise, as the Bank may deem necessary or advisable for
     the enforcement of this Agreement; and the Holders will execute and deliver
     to the Bank such powers of attorney, assignments and other instruments or
     documents, including notes and stock certificates (together with such
     assignments or endorsements as the Bank shall deem necessary), as may be
     requested by the Bank in order to enable the Bank, upon any Holder's
     failure to act after notice as provided above, to enforce any and all
     claims upon or with respect to any or all of the Subordinated Debt and
     thereafter to collect and receive any and all payments and distributions
     which may be payable or deliverable at any time upon or with respect to the
     Subordinated Debt, all for the Bank's own benefit. Following payment in
     full of the Senior Debt, the Bank will remit to the Holders all dividends
     or other payments or distributions paid to and held by the Bank in excess
     of the Senior Debt.

               7. Payments Received by the Holders. Should any payment or
     distribution or security or instrument or proceeds thereof be received by a
     Holder upon or with respect to any of the Subordinated Debt prior to the
     satisfaction of all of the Senior Debt and termination of all obligations
     of the Bank to make advances under the Loan Agreement, such Holder shall
     receive and hold the same in trust, as trustee, for the benefit of the Bank
     and shall forthwith deliver the same to the Bank in precisely the form
     received (except for the endorsement or assignment of the Holder where
     necessary), for application on any of the Senior Debt, due or not due, and,
     until so delivered, the same shall be held in trust by the Holder as the
     property of the Bank. In the event of the failure of any of the Holders to
     make any such endorsement or assignment to the Bank, the Bank, or any of
     its officers or employees, are hereby irrevocably authorized to make the
     same.

               8. Amendment of Subordinate Documents; Assignment of Claims. The
     Holders agree that until the Senior Debt has been paid in full and
     satisfied and all obligations of the Bank to make further advances to the
     Borrower under the Loan Agreement have been terminated, the Holders will
     not suffer or permit any amendment or modification of any of the
     Subordinate Documents without the prior written consent of the Bank, and
     the Holders will not directly or indirectly assign or transfer to others
     any claim any of the Holders have or may have against any of the Borrowers
     unless such assignment or transfer is made expressly subject to this
     Agreement.

               9. Continuing Nature of Subordination; Conflicts. This Agreement
     shall be effective and may not be terminated or otherwise revoked by any of
     the Holders until the entire Senior Debt shall have been fully discharged
     and all obligations of the Bank to make further advances to the Borrower
     have been terminated. This is a continuing agreement of subordination and
     the Bank may continue, at any time and without notice to any of the
     Holders, to extend credit or other financial accommodations and

<PAGE>



     loan monies to or for the benefit of the Borrowers on the faith hereof and
     in accordance with the terms set forth herein. No obligation of any of the
     Holders hereunder shall be affected by the insolvency or dissolution of or
     the written revocation of this Agreement by any of the Holders or any other
     subordinator, pledgor, endorser, or guarantor, if any. Nothing herein
     affect the underlying obligations of the Borrowers to the Bank or to the
     Holders.

               10. Additional Agreements Between the Bank and the Borrowers. The
     Bank, at any time and from time to time, may enter into such agreement or
     agreements with any of the Borrowers as the Bank may deem proper, extending
     the time of payment of or renewing or otherwise altering the terms of all
     or any of the Senior Debt or affecting the security underlying any or all
     of the Senior Debt, and may exchange, sell, release, surrender or otherwise
     deal with any such security, without in any way thereby impairing or
     affecting this Agreement. The foregoing notwithstanding, Bank shall not
     make additional loans or increase the amount outstanding under the Loan
     Agreement unless (i) any such increases result from an increase in
     Borrowers' inventory or receivables borrowing base (provided that the
     advance rates with respect to such inventory or receivables are no more
     favorable to Borrowers than those contained in the Loan Agreement as of the
     date of this Agreement) and which, in any event, do not affect any Holder
     or the Holder's interests in the Debentures in any manner materially more
     adverse to the Holders than the Loan Agreement in existence on the date
     hereof or (ii) such additional loans satisfy the criteria set forth in
     Section 8.15 of the SPA.

               11. Legend on Subordinate Documents Evidence of Subordinated
     Debt. The Debentures and any other writing now existing or hereafter
     executed which serves to evidence any of the Subordinated Debt shall have
     stamped or typewritten across the face thereof the following legend: "The
     indebtedness of the Company evidenced hereby is subject to the rights of
     LaSalle National Bank, its successors and assigns, under a Subordination
     Agreement dated April __ 1999."

               12. Holders' Waivers. All of the Senior Debt shall be deemed to
     have been made or incurred in reliance upon this Agreement. The Holders
     expressly waive all notice of the acceptance by the Bank of the
     subordination and other provisions of this Agreement and all other notices
     not specifically required pursuant to the terms of this Agreement
     whatsoever, and the Holders expressly waive reliance by the Bank upon the
     subordination and other agreements as herein provided. The Holders agree
     that the Bank has not made any warranties or representations with respect
     to the due execution, legality, validity, completeness or enforceability of
     the Loan Agreement, or the collectibility of the Senior Debt, that the Bank
     shall be entitled to manage and supervise its respective loans to the
     Borrowers in accordance with applicable law and its respective usual
     practices, modified from time to time as it deems appropriate under the
     circumstances, without regard to the existence of any rights that the
     Holders may now or hereafter have in or to any of the assets of the
     Borrowers, and that the Bank shall not have any liability to any of the
     Holders for, and waive any claim which any of the Holders may now or
     hereafter have against the Bank arising out of (i) any and all actions
     which the Bank, in good faith, takes or omits to take (including, without
     limitation, actions with respect to the creation, perfection or
     continuation of liens or security interest in the Collateral and other
     security for the Senior Debt, actions with respect to the occurrence of an
     Event of Default, actions with respect to the foreclosure upon, sale,
     release, or depreciation of, or failure to realize upon, any of the
     Collateral and actions with respect to the collection of any claim for all
     or any part of the Senior Debt from any account debtor, guarantor or any
     other party with respect to the Loan Agreement or any other agreement
     related thereto or to the collection of the Senior Debt or the valuation,
     use, protection or release of the Collateral and/or other security for the
     Obligations), (ii) the Bank's election, in any proceeding instituted under
     Chapter 11 of Title 11 of the United States Code (11 U.S.C. Section 101
     et seq.)

<PAGE>



     (the "Bankruptcy Code"), of the application of Section 1111(b)(2) of the
     Bankruptcy Code, and/or (iii) any borrowing or grant of a security interest
     under Section 364 of the Bankruptcy Code to any of the Borrowers, as debtor
     in possession.

               13. Bank's Waivers. No waiver shall be deemed to be made by the
     Bank of any of its rights hereunder, unless the same shall be in writing
     signed on behalf of the Bank, and each waiver, if any, shall be a waiver
     only with respect to the specific instance involved and shall in no way
     impair the rights of the Bank or the obligations of the Holders to the Bank
     in any other respect at any other time.

               14. Information Concerning Financial Condition of Borrowers. The
     parties hereby assume responsibility for keeping themselves informed of the
     financial condition of the Borrowers, any and all endorsers and any and all
     guarantors of the Senior Debt and Subordinated Debt and of all other
     circumstances bearing upon the risk of nonpayment of the Senior Debt and/or
     Subordinated Debt that diligent inquiry would reveal, and hereby agree that
     they shall have no duty to advise each other of information known to them
     regarding such condition or any such circumstances. In the event either the
     Bank or any Holder, in its sole discretion, undertakes, at any time or from
     time to time, to provide any such information to the other parties hereto,
     it shall not be under any obligation (i) to provide any such information to
     the other parties on any subsequent occasion or (ii) to undertake any
     investigation not a part of its respective regular business routine and
     shall be under no obligation to disclose any information which, pursuant to
     accepted or reasonable commercial finance practices, it wishes to maintain
     confidential. The Holders hereby agree that all payments received by the
     Bank may be applied, reversed, and reapplied, in whole or in part, to any
     of the Senior Debt, as the Bank, in its sole discretion, deems appropriate
     and assents to any extension or postponement of the time of payment of the
     Senior Debt or to any other indulgence with respect thereto, to any
     substitution, exchange or release of collateral which may at any time
     secure the Senior Debt and to the addition or release of any other party or
     person primarily or secondarily liable therefor.

               15. Notice. The undersigned and the Bank shall promptly provide
     each other copies of any notices of default provided to the Borrowers under
     the Subordinate Documents or the Loan Agreement, in the manner specified in
     the Loan Agreement, addressed to the Bank and to the Holders at the address
     set forth below their respective signatures hereto.

               16. Governing Law. This Agreement has been delivered and accepted
     at and shall be deemed to have been made at Chicago, Illinois, and shall be
     interpreted, and the rights and obligations of the parties hereto
     determined, in accordance with the laws and decisions of the State of
     Illinois, shall be immediately binding upon the Holders and their
     successors and assigns, and shall inure to the benefit of the respective
     successors and assigns of the Bank.

               17. Consent to Service. The Holders expressly submit and consent
     to the jurisdiction of any state or federal court located within Cook
     County, Illinois in any action, suit or proceeding commenced therein in
     connection with or with respect to this Agreement and waive any objection
     to venue in connection therewith. The Holders hereby waive personal service
     of any and all process or papers issued or served in connection with the
     foregoing and agree that service of such process or papers may be made by
     registered or certified mail, postage prepaid, return receipt requested,
     directed to the Holders as set forth below.

               18. Waiver of Jury Trial. THE BANK AND THE HOLDERS HEREBY
     KNOWINGLY, VOLUNTARILY, AND INTENTIONALLY WAIVE ANY RIGHTS THEY MAY HAVE TO
     A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED HEREON, OR ARISING OUT
     OF, UNDER, IN CONNECTION WITH, OR RELATING TO THIS AGREEMENT, OR ANY OTHER
     LOAN DOCUMENT, OR ANY COURSE OF CONDUCT, COURSE OF DEALING,

<PAGE>



     STATEMENTS (WHETHER VERBAL OR WRITTEN), OR ACTIONS OF THE BANK OR THE
     HOLDERS. THIS PROVISION IS A MATERIAL INDUCEMENT FOR THE BANK TO ENTER INTO
     THIS AGREEMENT AND TO CONSENT TO THE EXECUTION OF THE SUBORDINATE DOCUMENTS
     AND THE INCURRENCE OF THE SUBORDINATED DEBT.

               19. Section Titles. The section titles contained in this
     Agreement are and shall be without substantive meaning or content of any
     kind whatsoever and are not a part of the agreement among the parties
     hereto.

               20. Authority. Each Holder hereby individually and severally
     warrants and represents that it has full power and authority to grant the
     subordination evidenced hereby.

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


                      [SIGNATURE PAGE(S) AND EXHIBITS, IF ANY,
                                  FOLLOW THIS PAGE]



                    IN WITNESS WHEREOF, this instrument has been executed as of
     this ___ day of April, 1999.

                              CASTLE CREEK TECHNOLOGY PARTNERS LLC

                              By:  Castle Creek Partners LLC
                             Its: Investment Manager

                                   By:
                                       ---------------------------------
                                   Name:     John D. Ziegelman
                                   Title:    Managing Member
                                   Address:  77 West Wacker, Suite 4040
                                             Chicago, Illinois 60601
                                   Telephone: 312-499-6900
                                   Telecopy:  312-499-6999


                              MARSHALL CAPITAL MANAGEMENT, INC.

                              By:
                                   -------------------------------------
                                      Name:
                                     Title:
                                   Address: c/o Credit Suisse First Boston
                                            11 Madison Avenue, Third Floor
                                            New York, NY 10010
                                   Telephone:
                                    Telecopy:


                              CAPITAL VENTURES INTERNATIONAL

                              By:
                                   -------------------------------------
                              Name:
                              Title:
                              Address: c/o Heights Capital Management
                                       425 California Street, Suite 1100
                                       San Francisco, California 94104
                              Telephone:
                              Telecopy:

<PAGE>




     Acknowledged and Accepted
     as of this ___ day of
     April,  1999

     LASALLE NATIONAL BANK


     By:
        -------------------------------


                          ACKNOWLEDGMENT AND AGREEMENT

               The undersigned companies hereby jointly and severally accept and
     acknowledge receipt of a copy of the foregoing Subordination Agreement as
     of this ___ day of April, 1999, and jointly and severally agree that they
     will not pay any of the "Subordinated Debt" (as defined in the foregoing
     Agreement) or grant any security therefor, except as the foregoing
     Agreement expressly provides. In the event of any breach by any of the
     undersigned of any of the provisions herein or of the foregoing Agreement,
     all of the "Senior Debt" (as defined in the foregoing Agreement) shall,
     without presentment, demand, protest or notice of any kind, become
     immediately due and payable, unless the Bank shall otherwise elect in
     writing. The undersigned further jointly and severally agree that the terms
     of this Agreement shall not give any of the undersigned any substantive
     rights vis-s-vis the Bank or the subordinating creditor(s) named above,
     other than pursuant to the Loan Agreement and the Subordinate Documents.


     WESTELL, INC.                     WESTELL TECHNOLOGIES, INC.


     By:                               By:
     Title:                            Title:



     WESTELL INTERNATIONAL, INC.       CONFERENCE PLUS, INC.


     By:                               By:
     Title:                            Title:

<PAGE>




     LOGO

     FOR IMMEDIATE RELEASE

     For additional information, contact:
     Investors:

     Bruce R. Albelda                        Brad Wills
     Westell, Inc.                           Brad Wills & Associates, Inc.
     630.375.4125                            Wills Public Relations
     [email protected]                    888.670.7080 x 407
     Press and Trade:                        [email protected]



           WESTELL ISSUES $20 MILLION SUBORDINATED CONVERTIBLE DEBENTURES 

          Group Includes Credit Suisse First Boston Affiliate, Castle Creek
                Technology Partners and Susquehanna Financial Group 


     AURORA, ILLINOIS... (April 15, 1999) ...Westell Technologies, Inc. (NASDAQ:
     WSTL) announced today that it has completed a subordinated convertible
     debenture private placement totaling $20 million. The private placement was
     led by Castle Creek Technology Partners LLC and included Marshall Capital
     Management, Inc., an affiliate of Credit Suisse First Boston Corp., and
     Susequehanna Financial Group. Hambrecht & Quist served as the Company's
     placement agent on this transaction.

     "This investment strengthens our financial position, increases our
     flexibility and enhances our ability to capitalize on our strategic
     initiatives," stated Stephen Hawrysz, Westell's Chief Financial Officer.
     "We are pleased to have the support of such outstanding firms and look
     forward to a long and mutually rewarding relationship."

     The five-year, 6% subordinated debenture is convertible into Westell's
     Class A Common stock at a conversion price equal to $6.37 (135% of the 15
     day average closing bid price through the second day prior to executing
     definitive documentation). In certain cases, the conversion price is
     subject to adjustment at twelve and twenty-four months after closing and in
     certain circumstances, the debentures may be convertible at market price.
     In connection with the financing, Westell issued five-year warrants for
     approximately 909,000 shares of Class A Common Stock at an exercise price
     equal to 140% of the initial conversion price of the debentures.

     The securities issued in the private placement have not been registered
     under the Securities Act of 1933, as amended, and may not be offered or
     sold in the United States absent registration or an applicable exemption
     from registration requirements.

     Westell Technologies, Inc, headquartered in Aurora, Illinois, is a holding
     company for Westell, Inc. and Conference Plus, Inc.  Westell, Inc.
     manufactures and licenses DSL systems and valued added CPE, and
     manufactures telecommunications access products. Conference Plus, Inc. is
     a multi-point telecommunications service bureau specializing in audio
     teleconferencing, multi-point video conferencing, broadcast fax, and IP
     multimedia conferencing services. Additional information can be obtained
     by visiting Westell's Web site at http://www.westell.com.

     "Safe Harbor" statement under the Private Securities Litigation Reform Act
     of 1995:

     Certain statements contained herein including, without limitation,
     strengthens our financial position, increases our flexibility and enhances
     our ability to capitalize on our strategic initiatives are forward looking

<PAGE>



     statements that involve risks and uncertainties. These risks include, but
     are not limited to, product demand and market acceptance risks (including
     the future commercial acceptance of Westell's ADSL systems by telephone
     companies and other customers), the impact of competitive products and
     technologies (such as cable modems and fiber optic cable), competitive
     pricing pressures, product development, excess and obsolete inventory due
     to new product development, commercialization and technological delays or
     difficulties (including delays or difficulties in developing, producing,
     testing and selling new products and technologies, such as ADSL systems),
     the effect of Westell's accounting policies, the effect of economic
     conditions and trade, legal, social, and economic risks (such as import,
     licensing and trade restrictions) and other risks more fully described in
     Westell's Annual Report on Form 10-K for the fiscal year ended March 31,
     1998 under the section "Risk Factors". Westell undertakes no obligation to
     release publicly the result of any revisions to these forward looking
     statements that may be made to reflect events or circumstances after the
     date hereof or to reflect the occurrence of unanticipated events.
                                      -End-

<PAGE>





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