WESTELL TECHNOLOGIES INC
S-3/A, 1997-12-02
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>   1
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON DECEMBER 2, 1997
    
   
                                                      REGISTRATION NO. 333-39201
    
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
   
                                 PRE-EFFECTIVE
    
   
                                AMENDMENT NO. 1
    
   
                                       TO
    
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                           WESTELL TECHNOLOGIES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                            ------------------------
 
                                    DELAWARE
                        (State or other jurisdiction of
                         incorporation or organization)
                                   36-3154957
                                (I.R.S. Employer
                              Identification No.)
 
                              750 N. Commons Drive
                             Aurora, Illinois 60504
                                 (630) 898-2500
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)
                            ------------------------

                                Gary F. Seamans
                                  Chairman and
                            Chief Executive Officer
                              750 N. Commons Drive
                             Aurora, Illinois 60504
                                 (630) 898-2500
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
 
                                    COPY TO:
 
                                 Neal J. White
                            William J. Quinlan, Jr.
                                Heidi J. Steele
                            McDermott, Will & Emery
                             227 West Monroe Street
                            Chicago, Illinois 60606
                                 (312) 372-2000
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effective date of this Registration Statement as determined in
light of market conditions.
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]
 
     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, please check the following box. [X]
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]

                            ------------------------
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
================================================================================
<PAGE>   2
 
     Information contained herein is subject to completion or amendment. A
     registration statement relating to these securities has been filed with the
     Securities and Exchange Commission. These securities may not be sold nor
     may offers to buy be accepted prior to the time the registration statement
     becomes effective. This prospectus shall not constitute an offer to sell or
     the solicitation of an offer to buy nor shall there be any sale of these
     securities in any State in which such offer, solicitation or sale would be
     unlawful prior to the registration or qualification under the securities
     laws of any such State.
 
   
                 SUBJECT TO COMPLETION, DATED DECEMBER 2, 1997
    
 
PROSPECTUS
 
   
                                  $300,000,000
    
 
                           WESTELL TECHNOLOGIES, INC.
   
                    DEBT SECURITIES AND CLASS A COMMON STOCK
    
   
     Westell Technologies, Inc. ("Westell" or the "Company") may from time to
time offer, together or separately, (1) its debt securities (the "Debt
Securities"), which may be either senior debt securities (the "Senior Debt
Securities") or subordinated debt securities (the "Subordinated Debt
Securities") and (2) shares of its Class A Common Stock, par value $0.01 per
share (the "Class A Common Stock"). The Debt Securities and the Class A Common
Stock are collectively referred to herein as the "Securities."
    
 
   
     The Securities offered pursuant to this Prospectus may be issued in one or
more series or issuances and will be limited to $300,000,000 aggregate public
offering price (or its equivalent (based on the applicable exchange rate at the
time of the sale) in one or more foreign currencies, currency units or composite
currencies, including European currency units, as shall be designated by the
Company). Certain specific terms of the particular Securities in respect of
which this Prospectus is being delivered is set forth in the accompanying
Prospectus Supplement (the "Prospectus Supplement"), including, where
applicable, (i) in the case of Debt Securities, the specific title, aggregate
principal amount, currency, the denomination, whether such Debt Securities are
secured or unsecured obligations, whether such Debt Securities are senior or
subordinated, maturity, premium, if any, the interest rate (which may be fixed,
floating or adjustable), the time and method of calculating payment of interest,
if any, the place or places where principal of (and premium, if any) and
interest, if any, on such Debt Securities will be payable, the currency in which
principal of (and premium, if any) and interest, if any, on such Debt Securities
will be payable, any terms of redemption at the option of the Company or the
Holder, any sinking fund provisions, terms for any conversion into other
Securities, the initial public offering price and other special terms and (ii)
in the case of Class A Common Stock, the number of shares offered for sale by
the Company and the public offering price or method of determining the public
offering price. If so specified in the applicable Prospectus Supplement, Debt
Securities of a series may be issued in whole or in part in the form of one or
more temporary or permanent global securities. The Company's Class A Common
Stock is listed on the Nasdaq National Market under the symbol "WSTL." Any Class
A Common Stock sold pursuant to a Prospectus Supplement will be quoted on such
market.
    
 
     Unless otherwise specified in a Prospectus Supplement, the Senior Debt
Securities, when issued, will be unsecured and will rank equally with all other
unsecured and unsubordinated indebtedness of the Company. The Subordinated Debt
Securities, when issued, will be subordinated in right of payment to all Senior
Debt (as defined) of the Company, including any outstanding Senior Debt
Securities. See "Description of Debt Securities -- Subordination of Subordinated
Debt Securities."
 
     The Prospectus Supplement may contain information concerning U.S. federal
income tax considerations, if applicable to the Securities offered.
 
     The Securities may be sold directly, through agents, underwriters or
dealers as designated from time to time, or through a combination of such
methods. See "Plan of Distribution." If agents of the Company or any dealers or
underwriters are involved in the sale of the Securities in respect of which the
Prospectus is being delivered, the names of such agents, dealers or underwriters
and any applicable commissions or discounts, if any, will be set forth in or may
be calculated from the Prospectus Supplement with respect to such Securities.
 
     This Prospectus may not be used to consummate sales of Securities unless
accompanied by a Prospectus Supplement.
 
      SEE "RISK FACTORS" ON PAGE 5 FOR CERTAIN CONSIDERATIONS RELEVANT TO AN
INVESTMENT IN THE SECURITIES.
                             ----------------------
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
                               CRIMINAL OFFENSE.
                             ----------------------
 
   
             The date of this Prospectus is                ,      .
    
<PAGE>   3
 
                             AVAILABLE INFORMATION
 
   
     The Company is subject to the information requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information filed by the Company can be inspected and
copied at the public reference facilities maintained by the Commission at Room
1024, 450 Fifth Street, NW, Washington, D.C. 20549, and at the Commission's
Regional Offices located at Citicorp Center, 500 West Madison Street, Suite
1400, Chicago, Illinois 60661 and 7 World Trade Center, Suite 1300, New York,
New York 10048. Copies of such material can be obtained from the Public
Reference Section of the Commission, 450 Fifth Street, NW, Washington, D.C.
20549, at prescribed rates. The Commission maintains a World Wide Web site that
contains reports, proxy and information statements and other information
regarding registrants that file electronically with the Commission. The address
of the World Wide Web site is http://www.sec.gov. The Class A Common Stock is
listed for quotation on the Nasdaq National Market. Reports, proxy statements
and other information concerning the Company may be inspected at the office of
The Nasdaq Stock Market at 1735 K Street, N.W., Washington, D.C. 20006.
    
 
     The Company has filed with the Commission a registration statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"), with respect to the Securities. This Prospectus which
constitutes part of the Registration Statement does not contain all of the
information set forth in the Registration Statement, certain parts of which are
omitted in accordance with the rules and regulations of the Commission. For
further information with respect to the Company and the Securities offered
hereby, reference is made to the Registration Statement and the exhibits and the
financial statements, notes and schedules filed as a part thereof or
incorporated by reference therein, which may be inspected at the public
reference facilities of the Commission at the addresses set forth above or
through the Commission's World Wide Web site.
 
     Statements contained in this Prospectus as to the contents of any contract
or other document are not necessarily complete, and in each instance are
qualified in all respects by reference to the copy of such contract or document
filed as an exhibit to the Registration Statement.
 
                             ----------------------
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The following documents have been filed with the Commission and are
incorporated herein by reference:
 
     (1) The Company's Annual Report on Form 10-K for the fiscal year ended
March 31, 1997;
 
   
     (2) The Company's Quarterly Reports on Form 10-Q for the fiscal quarters
ended June 30, 1997 and September 30, 1997;
    
 
   
     (3) The Company's Current Reports on Form 8-K dated October 2, 1997 and
November 20, 1997; and
    
 
   
     (4) The description of the Class A Common Stock contained in the Company's
Registration Statement on Form 8-A dated November 22, 1995.
    
 
     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Registration Statement of which
this Prospectus forms a part and prior to the termination of the offering of the
Securities offered hereby shall be deemed to be incorporated by reference into
this Prospectus and be a part hereof from the date of filing such documents.
 
                                        2
<PAGE>   4
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of the Registration Statement or this Prospectus to the extent that
a statement contained herein, in a Prospectus Supplement or in any other
document subsequently filed with the Commission which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of the Registration Statement or this
Prospectus.
 
     The Company will furnish without charge to each person, including any
beneficial owner, to whom this Prospectus is delivered, on the written or oral
request of such person, a copy of any or all of the documents incorporated by
reference, other than exhibits to such documents (unless such exhibits are
specifically incorporated by reference into such documents). Requests should be
directed to Stephen J. Hawrysz, Corporate Secretary, Westell Technologies, Inc.,
750 N. Commons Drive, Aurora, Illinois, 60504 (telephone number: (630)
898-2500).
 
     No person is authorized to give any information or to make any
representations other than those contained in this Prospectus or a Prospectus
Supplement in connection with the offering described herein and therein, and any
information or representations not contained herein or therein must not be
relied upon as having been authorized by the Company or by any underwriter,
dealer or agent. This Prospectus may not be used to consummate sales of Offered
Securities unless accompanied by a Prospectus Supplement. Neither this
Prospectus nor any Prospectus Supplement shall constitute an offer to sell or a
solicitation of an offer to buy any of the Offered Securities covered by this
Prospectus in any jurisdiction to any person to whom it is unlawful to make such
offer or solicitation in such jurisdiction. The delivery of this Prospectus and
the applicable Prospectus Supplement at any time does not imply that the
information herein is correct as of any time subsequent to the date hereof.
 
                                        3
<PAGE>   5
 
                                  THE COMPANY
 
     Since 1980, Westell has developed telecommunications products that address
the needs of telephone companies ("telcos") to upgrade their existing network
infrastructures in order to deliver advanced data and voice services to their
customers. Westell designs, manufactures, markets and services a broad range of
digital and analog products used by telcos to deliver services primarily over
existing copper telephone wires that connect end users to a telco's central
office (the "local access network"). Westell also markets its products and
services to other telecommunications and information service providers seeking
direct access to end-user customers. Westell's principal customers include the
Regional Bell Operating Companies (the "RBOCs") as well as GTE. In addition,
Westell sells products to several other entities, including public telephone
administrations located outside the U.S., independent domestic local exchange
carriers, competitive access providers, interexchange carriers, Internet service
providers and the U.S. federal government.
 
     Westell is a leading worldwide innovator and developer of broadband
telecommunications access systems using an emerging technology known as
Asymmetric Digital Subscriber Line ("ADSL"), which is part of the family of
Digital Subscriber Line ("DSL") products. ADSL systems will allow telcos and
other local access providers to provide interactive multimedia services over
existing copper wire, thus offering a more cost-effective and faster deployment
alternative to fiber optic cable in the "last-mile" of the local access network.
ADSL systems enable interactive multimedia services such as advanced data
applications, including high speed Internet access, local area network ("LAN")
extension, telecommuting and medical imaging, as well as emerging video
applications, including video-on-demand, distance learning, video conferencing
and work at home. Currently, over 100 domestic and international customers,
including Ameritech, Bell Atlantic, Bell Canada, British Telecom, GTE, MCI, US
West Interprise, Telecom Italia and leading Internet service providers are
conducting or have conducted technical or marketing trials for new interactive
multimedia services that rely on Westell's ADSL systems. These ADSL trials
primarily began in 1995 and 1996, except for the Bell Atlantic trial which
commenced in 1993. Early trials focused on video applications such as video on
demand and distance learning. Currently, the focus is on more intense data
applications such as high speed Internet access, LAN extension and
telecommuting. Westell is unable to predict the outcome of such trials or when
such trials will be completed.
 
                                        4
<PAGE>   6
 
                                  RISK FACTORS
 
     Prior to making an investment decision with respect to the Securities
offered hereby, prospective investors should carefully consider the specific
factors set forth under the caption "Risk Factors" in the applicable Prospectus
Supplement pertaining thereto, together with all of the other information
appearing herein or therein or incorporated by reference herein, in light of
their particular investment objectives and financial circumstances.
 
                                USE OF PROCEEDS
 
     Unless otherwise specified in an applicable Prospectus Supplement, the net
proceeds to be received by the Company from the sale of the Securities will be
used for general corporate purposes.
 
                      RATIOS OF EARNINGS TO FIXED CHARGES
 
   
     The following are the unaudited consolidated ratios of earnings to fixed
charges for the six months ended September 30, 1997 and September 30, 1996 and
for each of the years in the five-year period ended March 31, 1997:
    
 
   
<TABLE>
<CAPTION>
                                           SIX MONTHS ENDED
                                         ---------------------         FISCAL YEAR ENDED MARCH 31,
                                         SEPT. 30,   SEPT. 30,   ----------------------------------------
                                           1997        1996       1997      1996    1995    1994    1993
                                         ---------   ---------    ----      ----    ----    ----    ----
<S>                                      <C>         <C>         <C>       <C>      <C>     <C>     <C>
Ratio of Earnings to Fixed
  Charges(1)...........................        --         --          --       --     --      --    12.2
Coverage deficiency (in thousands)(2)..   $14,957     $6,112     $24,521   $3,339   $913    $676    $ --
</TABLE>
    
 
- ------------------------------
(1) For purposes of computing the ratios of earnings to fixed charges, income
    before income tax expense (excluding interest costs capitalized) plus fixed
    charges has been divided by fixed charges. Fixed charges consist of interest
    costs (including interest costs capitalized) and estimated interest included
    in rentals (one-third of net rental expense).
 
(2) Coverage deficiency represents the dollar amount of earnings required to
    achieve a one-to-one ratio of earnings to fixed charges.
 
                         DESCRIPTION OF DEBT SECURITIES
 
   
     The Debt Securities may be issued from time to time in one or more series.
The particular terms of each series, or of Debt Securities forming a part of a
series, which are offered by a Prospectus Supplement will be described in such
Prospectus Supplement. The Senior Debt Securities are to be issued under an
Indenture (the "Senior Indenture"), between the Company, as issuer, and LaSalle
National Bank, as Trustee (the "Trustee"). The Subordinated Debt Securities are
to be issued under a separate Indenture (the "Subordinated Indenture"), also
between the Company, as issuer, and LaSalle National Bank, as Trustee. The
Senior Indenture and Subordinated Indenture are sometimes referred to
collectively as the "Indentures." A copy of the form of each Indenture is filed
as an exhibit to the Registration Statement of which this Prospectus is a part.
    
 
     The following summaries of certain provisions of the Indentures do not
purport to be complete and are subject, and are qualified in their entirety by
reference, to all the provisions of the Indentures, including the definitions
therein of certain terms, and, with respect to any particular Debt Securities,
to the description of the terms thereof included in the Prospectus Supplement
relating thereto. Wherever particular Sections, Articles or defined terms of the
Indentures are referred to herein or in a Prospectus Supplement, such Sections,
Articles or defined terms are incorporated by reference herein or therein, as
the case may be. Section and Article references used herein are references to
the Indentures.
 
                                        5
<PAGE>   7
 
GENERAL
 
     The Indentures will provide that the Debt Securities may be issued in
separate series thereunder from time to time without limitation as to aggregate
principal amount. The Company may specify a maximum aggregate principal amount
for the Debt Securities of any series. (Section 301) The Debt Securities are to
have such terms and provisions which are not inconsistent with the Indentures,
including as to maturity, principal and interest, as the Company may determine.
Unless otherwise specified in the applicable Prospectus Supplement, the Senior
Debt Securities when issued will be unsecured and unsubordinated obligations of
the Company and will rank on a parity with all other unsecured and
unsubordinated indebtedness of the Company. The Subordinated Debt Securities
when issued will be subordinated in right of payment to the prior payment in
full of all Senior Debt of the Company, including any outstanding Senior Debt
Securities, as described under "Subordination of Subordinated Debt Securities"
and in the applicable Prospectus Supplement.
 
     The applicable Prospectus Supplement will set forth whether the Debt
Securities offered shall be Senior Debt Securities or Subordinated Debt
Securities and the price or prices at which the Debt Securities to be offered
will be issued and will describe the following terms of such Debt Securities:
(1) the title of such Debt Securities; (2) any limit on the aggregate principal
amount of such Debt Securities or the series of which they are a part; (3) the
Person to whom any interest on a Debt Security of the series shall be payable,
if other than the Person in whose name that Debt Security (or one or more
predecessor Debt Securities) is registered at the close of business on the
Regular Record Date for such interest; (4) the date or dates on which the
principal of any of such Debt Securities will be payable; (5) the rate or rates
at which any of such Debt Securities will bear interest, if any, the date or
dates from which any such interest will accrue, the Interest Payment Dates on
which any such interest will be payable and the Regular Record Date for any such
interest payable on any Interest Payment Date; (6) the place or places where the
principal of and any premium and interest on any of such Debt Securities will be
payable; (7) the period or periods within which, the price or prices at which
and the terms and conditions on which any of such Debt Securities may be
redeemed, in whole or in part, at the option of the Company; (8) the obligation,
if any, of the Company to redeem or purchase any of such Debt Securities
pursuant to any sinking fund or analogous provision or at the option of the
Holder thereof, and the period or periods within which, the price or prices at
which and the terms and conditions on which any of such Debt Securities will be
redeemed or purchased, in whole or in part, pursuant to any such obligation; (9)
the denominations in which any of such Debt Securities will be issuable, if
other than denominations of $1,000 and any integral multiple thereof; (10) if
the amount of principal of or any premium or interest on any of such Debt
Securities may be determined with reference to an index or pursuant to a
formula, the manner in which such amounts will be determined; (11) if other than
the currency of the United States of America, the currency, currencies or
currency units in which the principal of or any premium or interest on any of
such Debt Securities will be payable (and the manner in which the equivalent of
the principal amount thereof in the currency of the United States of America is
to be determined for any purpose, including for the purpose of determining the
principal amount deemed to be Outstanding at any time); (12) if the principal of
or any premium or interest on any of such Debt Securities is to be payable, at
the election of the Company or the Holder thereof, in one or more currencies or
currency units other than those in which such Debt Securities are stated to be
payable, the currency, currencies or currency units in which payment of any such
amount as to which such election is made will be payable, the periods within
which and the terms and conditions upon which such election is to be made and
the amount so payable (or the manner in which such amount is to be determined);
(13) if other than the entire principal amount thereof, the portion of the
principal amount of any of such Debt Securities which will be payable upon
declaration of acceleration of the Maturity thereof; (14) if the principal
amount payable at the Stated Maturity of any of such Debt Securities will not be
determinable as of any one or more dates prior to the Stated Maturity, the
amount which will be deemed to be such principal amount as of any such date for
any purpose, including the principal amount thereof which will be due and
payable upon any Maturity other than the Stated Maturity or which will be deemed
to be Outstanding as of any such date (or, in
 
                                        6
<PAGE>   8
 
   
any such case, the manner in which such deemed principal amount is to be
determined); (15) if applicable, that such Debt Securities, in whole or any
specified part, are defeasible pursuant to the provisions of the Indentures
described under "Defeasance and Covenant Defeasance-Defeasance and Discharge" or
"Defeasance and Covenant Defeasance-Defeasance of Certain Covenants," or under
both such captions; (16) if applicable, the terms of any right to convert Debt
Securities into shares of Class A Common Stock of the Company or other
securities or property; (17) whether any of such Debt Securities will be
issuable in whole or in part in the form of one or more Global Securities and,
if so, the respective Depositaries for such Global Securities, the form of any
legend or legends to be borne by any such Global Security in addition to or in
lieu of the legends referred to under "Form, Exchange and Transfer" or "Global
Securities" and, if different from those described under such captions, any
circumstances under which any such Global Security may be exchanged in whole or
in part for Securities registered, and any transfer of such Global Security in
whole or in part may be registered, in the names of Persons other than the
Depositary for such Global Security or its nominee; (18) any addition to or
change in the Events of Default applicable to any of such Debt Securities and
any change in the right of the Trustee or the Holders to declare the principal
amount of any of such Debt Securities due and payable; (19) the nonapplicability
of, or any addition to or change in the covenants in the Indentures described
under "Certain Covenants of the Company" applicable to any of such Debt
Securities; and (20) any other terms of such Debt Securities not inconsistent
with the provisions of the relevant Indenture. (Section 301)
    
 
     Debt Securities, including Original Issue Discount Securities, may be sold
at a substantial discount below their principal amount. Certain special United
States federal income tax considerations (if any) applicable to Debt Securities
sold at an original issue discount will be described in the applicable
Prospectus Supplement under "United States Taxation." In addition, certain
special United States federal income tax or other considerations (if any)
applicable to any Debt Securities which are denominated in a currency or
currency unit other than United States dollars will be described in the
applicable Prospectus Supplement.
 
CONVERSION AND EXCHANGE RIGHTS
 
   
     The terms on which Debt Securities of any series are convertible or
exchangeable into Class A Common Stock or other securities or property will be
set forth in the Prospectus Supplement relating thereto. Such terms shall
include provisions as to whether conversion or exchange is mandatory or at the
option of the Holder and may include provisions pursuant to which the number of
shares of Class A Common Stock or other securities or property to be received by
the Holders of Debt Securities upon conversion or exchange would be calculated
according to the market price of Class A Common Stock or other securities or
property as of a time stated in the applicable Prospectus Supplement. (Article
Fourteen)
    
 
SUBORDINATION OF SUBORDINATED DEBT SECURITIES
 
     Unless otherwise indicated in the Prospectus Supplement, the following
provisions will apply to the Subordinated Debt Securities.
 
     The Subordinated Debt Securities will, to the extent set forth in the
Subordinated Indenture, be subordinate in right of payment to the prior payment
in full of all Senior Debt, including the Senior Debt Securities. In the event
of any insolvency or bankruptcy case or proceeding, or any receivership,
liquidation, reorganization, debt restructuring or other similar case or
proceeding in connection therewith, relative to the Company or to its creditors,
as such, or to its assets, or any liquidation, dissolution or other winding up
of the Company, whether voluntary or involuntary and whether or not involving
insolvency or bankruptcy, or any assignment for the benefit of creditors or any
other marshaling of assets and liabilities of the Company, the holders of Senior
Debt will be entitled to receive payment in full of all amounts due or to become
due on or in respect of all Senior Debt in cash or other payment satisfactory to
the holders of Senior Debt before the Holders of the Subordinated Debt
Securities are entitled to receive any payment on account of principal of or any
 
                                        7
<PAGE>   9
 
premium or interest on the Subordinated Debt Securities or on account of the
purchase, redemption or other acquisition of Subordinated Debt Securities or
before the Company may make any sinking fund or defeasance payment to the
Trustee or any Paying Agent in accordance with the Subordinated Indenture.
Notwithstanding the foregoing, any amounts previously deposited by the Company
with the Trustee or Paying Agent in accordance with the subordination provisions
of Article Fifteen of the Subordinated Indenture at the time of such deposit may
be paid to the Holders of Subordinated Debt Securities ("Defeased Payments").
(Section 1502)
 
     By reason of such subordination, in the event of liquidation or insolvency,
creditors of the Company who are not holders of Senior Debt may recover less,
ratably, than holders of Senior Debt and may recover more, ratably, than the
Holders of the Subordinated Debt Securities.
 
     In the event that any Subordinated Debt Securities are declared due and
payable before their Stated Maturity as a result of an Event of Default, the
holders of the Senior Debt outstanding at the time such Subordinated Debt
Securities so become due and payable will be entitled to receive payment in full
of all amounts due or to become due on or in respect of all Senior Debt in cash
or other payment satisfactory to the holders of Senior Debt before the Holders
of the Subordinated Debt Securities are entitled to receive any payment by the
Company on account of the principal of or any premium or interest on the
Subordinated Debt Securities or on account of the purchase, redemption or other
acquisition of Subordinated Debt Securities or before the Company may make any
sinking fund or defeasance payment to the Trustee or any Paying Agent in
accordance with the Subordinated Indenture (other than Defeased Payments). If
the payment of Subordinated Debt Securities is accelerated because of an Event
of Default, the Company is required under the Subordinated Indenture to promptly
notify holders of Senior Debt of the acceleration. (Section 1503)
 
   
     The Company may not make any payment of principal (or premium, if any) or
interest, if any, in respect of the Subordinated Debt Securities or on account
of the purchase, redemption or other acquisition of Subordinated Debt Securities
or any payment constituting a sinking fund or defeasance payment to the Trustee
or Paying Agent in accordance with the Subordinated Indenture (other than
Defeased Payments) if (i) a default in the payment of principal, premium, if
any, or interest (including a default under any repurchase or redemption
obligation) or other amounts with respect to any Senior Debt occurs and is
continuing beyond the applicable grace period or (ii) any other event of default
occurs and is continuing with respect to Designated Senior Debt (as defined)
that permits the holders thereof or their representatives to accelerate the
maturity thereof, and the Trustee under the Subordinated Indenture receives a
notice of such default (a "Payment Blockage Notice") from the Company, a holder
of such Designated Senior Debt or other person permitted to give such notice
under the Subordinated Indenture. The Company may and shall resume payments on
the Subordinated Debt Securities and may purchase, redeem or otherwise acquire
the Subordinated Debt Securities and may make a sinking fund or defeasance
payment to the Trustee or Paying Agent in accordance with the Subordinated
Indenture (a) in the case of a payment default, upon the date on which such
default is cured or waived or ceases to exist and (b) in the case of a
nonpayment default, the earlier of the date on which such nonpayment default is
cured or waived or ceases to exist or 179 days after the date on which the
applicable Payment Blockage Notice is received (unless the subordination
provisions of Article Fifteen of the Subordinated Indenture prohibit the
payment, distribution, purchase, redemption, acquisition, sinking fund payment
or defeasance payment at the time of such payment, distribution, purchase,
redemption, acquisition, sinking fund payment or defeasance payment (including,
without limitation, in the case of a nonpayment default referred to in clause
(ii) above, as a result of a payment default with respect to the applicable
Senior Debt as a consequence of the acceleration of the maturity thereof or
otherwise)). No new period of payment blockage may be commenced unless and until
365 days have elapsed since the effectiveness of the immediately prior Payment
Blockage Notice and all scheduled payments of principal, premium if any, and
interest on the Subordinated Debt Securities that have come due have been paid
in full in cash. No nonpayment default that existed or was
    
 
                                        8
<PAGE>   10
 
continuing on the date of delivery of any Payment Blockage Notice to the Trustee
(unless such default was waived, cured or otherwise ceased to exist and
thereafter subsequently reoccurred) under the Subordinated Indenture shall be,
or be made, the basis for a subsequent Payment Blockage Notice. (Section 1504)
In the case of Subordinated Debt Securities that are convertible at the option
of the Holder, the payment, issuance and delivery of cash, property or
securities (other than stock and certain subordinated securities of the Company)
upon conversion of a Subordinated Debt Security will be deemed to constitute
payment on account of the principal of such Subordinated Debt Security. (Section
1515)
 
   
     "Senior Debt" is defined in the Subordinated Indenture to mean: the
principal of (and premium, if any) and interest, if any (including interest
accruing on or after the filing of any petition in bankruptcy or for
reorganization relating to the Company to the extent that such claim for post-
petition interest is allowed in such proceeding), on, rent with respect to, and
all fees and other amounts payable in connection with, the following, whether
absolute or contingent, secured or unsecured, due or to become due, outstanding
on the date of the Subordinated Indenture or thereafter created, incurred or
assumed: (a) indebtedness of the Company evidenced by a credit or loan
agreement, note, bond, debenture or other written obligation, (b) all
obligations of the Company for money borrowed, (c) all obligations of the
Company evidenced by a note or similar instrument given in connection with the
acquisition of any businesses, properties or assets of any kind, (d) obligations
of the Company (i) as lessee under leases required to be capitalized on the
balance sheet of the lessee under generally accepted accounting principles, or
(ii) under any lease or related document (including a purchase agreement) that
provides that the Company is contractually obligated to purchase or cause a
third party to purchase the leased property and the obligations of the Company
under such lease or related document to purchase or to cause a third party to
purchase such leased property, (e) all obligations of the Company under interest
rate and currency swaps, caps, floors, collars, hedge agreements, forward
contracts, or similar agreements or arrangements, (f) all obligations of the
Company with respect to letters of credit, bankers' acceptances or similar
facilities (including reimbursement obligations with respect to any of the
foregoing), (g) all obligations of the Company issued or assumed as the deferred
purchase price of property or services (but excluding trade accounts payable
arising in the ordinary course of business), (h) all obligations of the type
referred to in clauses (a) through (g) above of another Person and all dividends
of another Person, the payment of which, in either case, the Company has assumed
or guaranteed (or in effect guaranteed through an agreement to purchase or
otherwise (including, without limitation, "take or pay" and similar
arrangements)), or for which the Company is responsible or liable, directly or
indirectly, jointly or severally, as obligor, guarantor or otherwise, or which
is secured by a lien on property of the Company, and all obligations of the
Company with respect thereto, and (i) renewals, extensions, modifications,
replacements, restatements and refundings of, or any indebtedness or obligation
issued in exchange for, any such indebtedness or obligation described in clauses
(a) through (h) of this paragraph; provided, however, that Senior Debt shall not
include the Subordinated Debt Securities or any such indebtedness or obligation
if the terms of such indebtedness or obligation (or the terms of the instrument
under which, or pursuant to which it is issued) expressly provide that such
indebtedness or obligation is not superior in right of payment to the
Subordinated Debt Securities.
    
 
     "Designated Senior Debt" means the Company's obligations under certain
existing Senior Debt and the Company's obligations under any other particular
Senior Debt in which the instrument creating or evidencing the same or the
assumption or guarantee thereof (or related agreements or documents to which the
Company is a party) expressly provides that such Senior Debt shall be
"Designated Senior Debt" for purposes of the Subordinated Indenture (provided
that such instrument, agreement or other document may place limitations and
conditions on the right of such Senior Debt to exercise the rights of Designated
Senior Debt).
 
     The Subordinated Indenture does not limit or prohibit the incurrence of
additional Senior Debt, which may include indebtedness that is senior to the
Subordinated Debt Securities, but subordinate
 
                                        9
<PAGE>   11
 
to other obligations of the Company. The Senior Debt Securities, when issued,
will constitute Senior Debt.
 
     The Prospectus Supplement may further describe the provisions, if any,
applicable to the subordination of the Subordinated Debt Securities of a
particular series.
 
FORM, EXCHANGE AND TRANSFER
 
     The Debt Securities of each series will be issuable only in fully
registered form, without coupons, and, unless otherwise specified in the
applicable Prospectus Supplement, only in denominations of $1,000 and integral
multiples thereof. (Section 302)
 
     At the option of the Holder, subject to the terms of the Indentures and the
limitations applicable to Global Securities, Debt Securities of each series will
be exchangeable for other Debt Securities of the same series of any authorized
denomination and of a like tenor and aggregate principal amount. (Section 305)
 
     Subject to the terms of the Indentures and the limitations applicable to
Global Securities, Debt Securities may be presented for exchange as provided
above or for registration of transfer (duly endorsed or with the form of
transfer endorsed thereon duly executed) at the office of the Security Registrar
or at the office of any transfer agent designated by the Company for such
purpose. No service charge will be imposed for any registration of transfer or
exchange of Debt Securities, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection
therewith. Such transfer or exchange will be effected upon the Security
Registrar or such transfer agent, as the case may be, being satisfied with the
documents of title and identity of the person making the request. The Company
has appointed the Trustee as Security Registrar. Any transfer agent (in addition
to the Security Registrar) initially designated by the Company for any Debt
Securities will be named in the applicable Prospectus Supplement. (Section 305)
The Company may at any time designate additional transfer agents or rescind the
designation of any transfer agent or approve a change in the office through
which any transfer agent acts, except that the Company will be required to
maintain a transfer agent in each Place of Payment for the Debt Securities of
each series. (Section 1002)
 
     If the Debt Securities of any series (or of any series and specified tenor)
are to be redeemed in part, the Company will not be required to (i) issue,
register the transfer of or exchange any Debt Security of that series (or of
that series and specified tenor, as the case may be) during a period beginning
at the opening of business 15 days before the day of mailing of a notice of
redemption of any such Debt Security that may be selected for redemption and
ending at the close of business on the day of such mailing or (ii) register the
transfer of or exchange any Debt Security so selected for redemption, in whole
or in part, except the unredeemed portion of any such Debt Security being
redeemed in part. (Section 305)
 
GLOBAL SECURITIES
 
     Some or all of the Debt Securities of any series may be represented, in
whole or in part, by one or more global securities which will have an aggregate
principal amount equal to that of the Debt Securities represented thereby (a
"Global Security"). Each Global Security will be registered in the name of a
depositary (the "Depositary") or a nominee thereof identified in the applicable
Prospectus Supplement, will be deposited with such Depositary or nominee or a
custodian therefor and will bear a legend regarding the restrictions on
exchanges and registration of transfer thereof referred to below and any such
other matters as may be provided for pursuant to the Indentures.
 
     Notwithstanding any provision of the Indentures or any Debt Security
described herein, no Global Security may be exchanged in whole or in part for
Debt Securities registered, and no transfer of a Global Security in whole or in
part may be registered, in the name of any Person other than the Depositary for
such Global Security or any nominee of such Depositary unless (i) the Depositary
 
                                       10
<PAGE>   12
 
has notified the Company that it is unwilling or unable to continue as
Depositary for such Global Security or has ceased to be qualified to act as such
as required by the Indentures, (ii) there shall have occurred and be continuing
an Event of Default with respect to the Debt Securities represented by such
Global Security or (iii) there shall exist such circumstances, if any, in
addition to or in lieu of those described above as may be described in the
applicable Prospectus Supplement. All securities issued in exchange for a Global
Security or any portion thereof will be registered in such names as the
Depositary may direct. (Sections 204 and 305)
 
     As long as the Depositary, or its nominee, is the registered Holder of a
Global Security, the Depositary or such nominee, as the case may be, will be
considered the sole owner and Holder of such Global Security and the Debt
Securities represented thereby for all purposes under the Debt Securities and
the Indentures. Except in the limited circumstances referred to above, owners of
beneficial interests in a Global Security will not be entitled to have such
Global Security or any Debt Securities represented thereby registered in their
names, will not receive or be entitled to receive physical delivery of
certificated Debt Securities in exchange therefor and will not be considered to
be the owners or Holders of such Global Security or any Debt Securities
represented thereby for any purpose under the Debt Securities or the Indentures.
All payments of principal of and any premium and interest on a Global Security
will be made to the Depositary or its nominee, as the case may be, as the Holder
thereof. The laws of some jurisdictions require that certain purchasers of
securities take physical delivery of such securities in definitive form. These
laws may impair the ability to transfer beneficial interests in a Global
Security.
 
     Ownership of beneficial interests in a Global Security will be limited to
institutions that have accounts with the Depositary or its nominee
("participants") and to persons that may hold beneficial interests through
participants. In connection with the issuance of any Global Security, the
Depositary will credit, on its book-entry registration and transfer system, the
respective principal amounts of Debt Securities represented by the Global
Security to the accounts of its participants. Ownership of beneficial interests
in a Global Security will be shown only on, and the transfer of those ownership
interests will be effected only through, records maintained by the Depositary
(with respect to participants' interests) or any such participant (with respect
to interests of persons held by such participants on their behalf). Payments,
transfers, exchanges and others matters relating to beneficial interests in a
Global Security may be subject to various policies and procedures adopted by the
Depositary from time to time. None of the Company, the Trustee or any agent of
the Company or the Trustee will have any responsibility or liability for any
aspect of the Depositary's or any participant's records relating to, or for
payments made on account of, beneficial interests in a Global Security, or for
maintaining, supervising or reviewing any records relating to such beneficial
interests.
 
PAYMENT AND PAYING AGENTS
 
     Unless otherwise indicated in the applicable Prospectus Supplement, payment
of interest on a Debt Security on any Interest Payment Date will be made to the
Person in whose name such Debt Security (or one or more Predecessor Debt
Securities) is registered at the close of business on the Regular Record Date
for such interest. (Section 307)
 
     Unless otherwise indicated in the applicable Prospectus Supplement,
principal of and any premium and interest on the Debt Securities of a particular
series will be payable at the office of such Paying Agent or Paying Agents as
the Company may designate for such purpose from time to time, except that at the
option of the Company payment of any interest may be made by check mailed to the
address of the Person entitled thereto as such address appears in the Security
Register. Unless otherwise indicated in the applicable Prospectus Supplement,
the Corporate Trust Office of the Trustee will be designated as the Company's
sole Paying Agent for payments with respect to Debt Securities of each series.
Any other Paying Agents initially designated by the Company for the Debt
Securities of a particular series will be named in the applicable Prospectus
Supplement. The Company may at any time designate additional Paying Agents or
rescind the
 
                                       11
<PAGE>   13
 
designation of any Paying Agent or approve a change in the office through which
any Paying Agent acts, except that the Company will be required to maintain a
Paying Agent in each Place of Payment for the Debt Securities of a particular
series. (Section 1002)
 
     All moneys paid by the Company to a Paying Agent for the payment of the
principal of or any premium or interest on any Debt Security which remain
unclaimed for a period ending the earlier of 10 business days prior to the date
such money would escheat to the state or at the end of two years after such
principal, premium or interest has become due and payable will be repaid to the
Company, and the Holder of such Debt Security thereafter may look only to the
Company for payment thereof. (Section 1003)
 
CERTAIN COVENANTS OF THE COMPANY
 
   
     Except as set forth below or as otherwise provided in the applicable
Prospectus Supplement with respect to any series of Senior Debt Securities, the
Company is not restricted by the Senior Indenture from incurring, assuming or
becoming liable for any type of debt or other obligations, from paying dividends
or making distributions on its capital stock or purchasing or redeeming its
capital stock. The Senior Indenture does not require the maintenance of any
financial ratios or specified levels of net worth or liquidity. In addition, the
Senior Indenture does not contain any provision that would require the Company
to repurchase or redeem or otherwise modify the terms of any of its Senior Debt
Securities upon a change in control or other events involving the Company which
may adversely affect the creditworthiness of the Senior Debt Securities.
    
 
     Unless otherwise indicated in the applicable Prospectus Supplement, certain
covenants contained in the Senior Indenture which are summarized below will be
applicable (unless waived or amended) to the series of Senior Debt Securities to
which such Prospectus Supplement relates so long as any of the Senior Debt
Securities of such series are outstanding.
 
  LIMITATIONS ON LIENS
 
     The Company covenants that it will not issue, incur, create, assume or
guarantee, and will not permit any Restricted Subsidiary to issue, incur,
create, assume or guarantee, any debt for borrowed money secured by a mortgage,
security interest, pledge, lien, charge or other encumbrance ("mortgages") upon
any Principal Property (as defined below) of the Company or any Restricted
Subsidiary or upon any shares of stock or indebtedness of any Restricted
Subsidiary (whether such Principal Property, shares or indebtedness are now
existing or owned or hereafter created or acquired) without in any such case
effectively providing concurrently with the issuance, incurrence, creation,
assumption or guarantee of any such secured debt, or the grant of a mortgage
with respect to any such indebtedness, that the Senior Debt Securities (together
with, if the Company shall so determine, any other indebtedness of or guarantee
by the Company or such Restricted Subsidiary ranking equally with the Senior
Debt Securities) shall be secured equally and ratably with (or, at the option of
the Company, prior to) such secured debt. The foregoing restriction, however,
will not apply to: (a) mortgages on property existing at the time of acquisition
thereof by the Company or any Subsidiary, provided that such mortgages were in
existence prior to the contemplation of such acquisition; (b) mortgages on
property, shares of stock or indebtedness or other assets of any corporation
existing at the time such corporation becomes a Restricted Subsidiary, provided
that such mortgages are not incurred in anticipation of such corporation
becoming a Restricted Subsidiary (which may include property previously leased
by the Company and leasehold interests thereon, provided that the lease
terminates prior to or upon the acquisition); (c) mortgages on property, shares
of stock or indebtedness existing at the time of acquisition thereof by the
Company or a Subsidiary or mortgages thereon to secure the payment of all or any
part of the purchase price thereof, or mortgages on property, shares of stock or
indebtedness to secure any indebtedness for borrowed money incurred prior to, at
the time of, or within 270 days after, the latest of the acquisition thereof,
or, in the case of property, the completion of construction, the completion of
improvements, or the commencement of substantial commercial operation of such
 
                                       12
<PAGE>   14
 
property for the purpose of financing all or any part of the purchase price
thereof, such construction, or the making of such improvements; (d) mortgages to
secure indebtedness owing to the Company or to a Restricted Subsidiary; (e)
mortgages existing at the date of the Senior Indenture; (f) mortgages on
property of a corporation existing at the time such corporation is merged into
or consolidated with the Company or a Subsidiary or at the time of a sale, lease
or other disposition of the properties of a corporation as an entirety or
substantially as an entirety to the Company or a Restricted Subsidiary, provided
that such mortgage was not incurred in anticipation of such merger or
consolidation or sale, lease or other disposition; (g) mortgages in favor of the
United States or any State, territory or possession thereof (or the District of
Columbia), or any department, agency, instrumentality or political subdivision
of the United States or any State, territory or possession thereof (or the
District of Columbia), to secure partial, progress, advance or other payments
pursuant to any contract or statute or to secure any indebtedness incurred for
the purpose of financing all or any part of the purchase price or the cost of
constructing or improving the property subject to such mortgages; (h) mortgages
created in connection with the acquisition of assets or a project financed with,
and created to secure, a Nonrecourse Obligation (as defined below); and (i)
extensions, renewals, refinancings or replacements of any mortgage referred to
in the foregoing clauses (a), (b), (c), (d), (e), (f), (g), and (h) provided,
however, that any mortgages permitted by any of the foregoing clauses (a), (b),
(c), (d), (e), (f), (g), and (h) shall not extend to or cover any property of
the Company or such Restricted Subsidiary, as the case may be, other than the
property, if any, specified in such clauses and improvements thereto, and
provided further that any refinancing or replacement of any mortgages permitted
by the foregoing clauses (g) and (h) shall be of the type referred to in such
clauses (g) or (h), as the case may be.
 
     Notwithstanding the restrictions outlined in the preceding paragraph, the
Company or any Restricted Subsidiary will be permitted to issue, incur, create,
assume or guarantee debt secured by a mortgage which would otherwise be subject
to such restrictions, without equally and ratably securing the Senior Debt
Securities, provided that after giving effect thereto, the aggregate amount of
all debt so secured by mortgages (not including mortgages permitted under
clauses (a) through (i) above) does not exceed 10% of the Consolidated Net
Tangible Assets of the Company. (Section 1008 of the Senior Indenture)
 
  LIMITATIONS ON SALE AND LEASE-BACK TRANSACTIONS
 
     The Company covenants that it will not, nor will it permit any Restricted
Subsidiary to, enter into any Sale and Lease-Back Transaction (as defined below)
with respect to any Principal Property, other than any such transaction
involving a lease for a term of not more than three years or any such
transaction between the Company and a Restricted Subsidiary or between
Restricted Subsidiaries, unless (a) the Company or such Restricted Subsidiary
would be entitled to incur indebtedness secured by a mortgage on the Principal
Property involved in such transaction at least equal in amount to the
Attributable Debt with respect to such Sale and Lease-Back Transaction, without
equally and ratably securing the Senior Debt Securities, pursuant to the
limitation on liens in the Senior Indenture; or (b) the Company shall apply an
amount equal to the greater of the net proceeds of such sale or the Attributable
Debt with respect to such Sale and Lease-Back Transaction within 180 days of
such sale to either (or a combination of) the retirement (other than any
mandatory retirement, mandatory prepayment or sinking fund payment or by payment
at maturity) of debt for borrowed money of the Company or a Restricted
Subsidiary that matures more than 12 months after the creation of such
indebtedness or the purchase, construction or development of other comparable
property.
 
     Notwithstanding the restrictions outlined in the preceding paragraph, the
Company or any Restricted Subsidiary will be permitted to enter into Sale and
Lease-Back Transactions which would otherwise be subject to such restrictions,
without applying the net proceeds of such transactions in the manner set forth
in clause (b) above, provided that after giving effect thereto, the aggregate
amount of such Sale and Lease-Back Transactions, together with the aggregate
amount of all debt
 
                                       13
<PAGE>   15
 
secured by mortgages not permitted by clauses (a) through (i) under the
limitation in the Senior Indenture on liens, does not exceed 10% of the
Consolidated Net Tangible Assets of the Company. (Section 1009 of the Senior
Indenture)
 
  CERTAIN DEFINITIONS APPLICABLE TO COVENANTS (SECTION 101)
 
     The term "Attributable Debt" when used in connection with a Sale and
Lease-Back Transaction involving a Principal Property shall mean, at the time of
determination, the lesser of: (a) the fair value of such property (as determined
in good faith by the Board of Directors of the Company); or (b) the present
value of the total net amount of rent required to be paid under such lease
during the remaining term thereof (including any renewal term or period for
which such lease has been extended), discounted at the rate of interest set
forth or implicit in the terms of such lease or if not practicable to determine
such rate, the weighted average interest rate per annum (in the case of Original
Issue Discount Securities, the imputed interest rate) borne by the Senior Debt
Securities of each series outstanding pursuant to the Indenture compounded
semi-annually. For purposes of the foregoing definition, rent shall not include
amounts required to be paid by the lessee, whether or not designated as rent or
additional rent, on account of or contingent upon maintenance and repairs,
insurance, taxes, assessments, water rates and similar charges. In the case of
any lease which is terminable by the lessee upon the payment of a penalty, such
net amount shall be the lesser of the net amount determined assuming termination
upon the first date such lease may be terminated (in which case the net amount
shall also include the amount of the penalty, but no rent shall be considered as
required to be paid under such lease subsequent to the first date upon which it
may be so terminated) and the net amount determined assuming no such
termination.
 
     The term "Consolidated Net Tangible Assets" shall mean, as of any
particular time, total assets (excluding applicable reserves) less: (a) total
current liabilities, except for (1) notes and loans payable; (2) current
maturities of long-term debt and (3) current maturities of obligations under
capital leases; and (b) certain intangible assets to the extent included in
total assets; all as set forth on the most recent consolidated balance sheet of
the Company and its consolidated subsidiaries and computed in accordance with
generally accepted accounting principles.
 
     The term "Nonrecourse Obligation" means indebtedness or other obligations
substantially related to (i) the acquisition of assets not previously owned by
the Company or any Restricted Subsidiary or (ii) the financing of a project
involving the development or expansion of properties of the Company or any
Restricted Subsidiary, as to which the obligee with respect to such indebtedness
or obligation has no recourse to the Company or any Restricted Subsidiary or any
assets of the Company or any Restricted Subsidiary other than the assets which
were acquired with the proceeds of such transaction or the project financed with
the proceeds of such transaction (and the proceeds thereof).
 
     The term "Principal Property" shall mean the land, land improvements,
buildings and fixtures (to the extent they constitute real property interests
(including any leasehold interest therein)) constituting the principal corporate
office or any manufacturing facility (whether now owned or hereafter acquired)
which: (a) is owned by the Company or any Subsidiary; (b) is located within any
of the present 50 states of the United States of America (or the District of
Columbia); (c) has not been determined in good faith by the Board of Directors
of the Company not to be materially important to the total business conducted by
the Company and its Subsidiaries taken as a whole; and (d) has a book value on
the date as of which the determination is being made in excess of 1.0% of
Consolidated Net Tangible Assets of the Company as most recently determined on
or prior to such date.
 
     The term "Restricted Subsidiary" shall mean any Subsidiary which owns any
Principal Property; provided, however, that the term "Restricted Subsidiary"
shall not include (a) any Subsidiary which is principally engaged in financing
receivables, or which is principally engaged in financing the Company's
operations outside the United States of America; or (b) any Subsidiary less than
80% of
 
                                       14
<PAGE>   16
 
the voting stock of which is owned, directly or indirectly, by the Company or by
one or more other Subsidiaries, or by the Company and one or more other
Subsidiaries if the common stock of such Subsidiary is traded on any national
securities exchange or quoted on the Nasdaq National Market or in the
over-the-counter market.
 
     The term "Sale and Lease-Back Transaction" shall mean any arrangement with
any Person providing for the leasing by the Company or any Restricted Subsidiary
of any Principal Property which property has been or is to be sold or
transferred by the Company or such Restricted Subsidiary to such person.
 
   
     The term "Subsidiary" shall mean any corporation of which at least a
majority of the outstanding voting stock of such corporation is at the time
owned, directly or indirectly, by the Company or by one or more other
Subsidiaries, or by the Company and one or more other Subsidiaries, and the
accounts of which are consolidated with those of the Company in the most recent
consolidated financial statements in accordance with generally accepted
accounting principles. For the purposes of this definition, "voting stock" means
stock which ordinarily has voting power for the election of directors, whether
at all times or only so long as no senior class of stock has such voting power
by reason of any contingency.
    
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
     The Indentures will provide that the Company may not consolidate with or
merge into any other Person (in a transaction in which the Company is not the
surviving corporation), or convey, transfer or lease its properties and assets
substantially as an entirety to, any Person (a "Successor Person"), unless (i)
the Successor Person (if any) is a corporation, limited liability company,
partnership, trust or other entity organized and existing under the laws of any
domestic jurisdiction and assumes the Company's obligations on the Debt
Securities and under the Indentures, (ii) immediately after giving effect to the
transaction, no Event of Default, and no event which, after notice or lapse of
time or both, would become an Event of Default, shall have occurred and be
continuing, and (iii) certain other conditions are met. (Section 801)
 
EVENTS OF DEFAULT
 
   
     Each of the following will constitute an Event of Default under each
Indenture with respect to Debt Securities of any series outstanding under such
Indenture (unless such event is specifically inapplicable to a particular series
as described in the Prospectus Supplement relating thereto): (a) failure to pay
principal of or any premium on any Debt Security of that series when due whether
or not such payment is prohibited by the subordination provision of the
Subordinated Indenture; (b) failure to pay any interest on any Debt Securities
of that series when due, continued for 30 days whether or not such payment is
prohibited by the subordination provision of the Subordinated Indenture; (c)
failure to deposit any sinking fund payment, when due, in respect of any Debt
Security of that series whether or not such payment is prohibited by the
subordination provision of the Subordinated Indenture; (d) failure to perform
any other covenant of the Company in such Indenture (other than a covenant
included in the Indenture solely for the benefit of a series other than that
series), continued for 60 days after written notice has been given by the
Trustee, or the Holders of at least 25% in aggregate principal amount of the
Outstanding Securities of that series, as provided in the Indenture; (e) certain
events in bankruptcy, insolvency or reorganization with respect to the Company;
and (f) any other Event of Default specified in the applicable Prospectus
Supplement. (Section 501)
    
 
   
     Each Indenture will provide that, if an Event of Default (other than an
Event of Default described in clause (e) above) with respect to the Debt
Securities of any series at the time Outstanding under such Indenture shall
occur and be continuing, either the Trustee or the Holders of at least 25% in
aggregate principal amount of the Outstanding Securities of that series by
notice as provided in the Indenture may declare the principal amount of the Debt
Securities of that series (or, in the case of
    
 
                                       15
<PAGE>   17
 
   
any Debt Security that is an Original Issue Discount Security or the principal
amount of which is not then determinable, such portion of the principal amount
of such Debt Security, or such other amount in lieu of such principal amount, as
may be specified in the terms of such Debt Security) to be due and payable
immediately. If an Event of Default described in clause (e) above with respect
to the Debt Securities of any series at the time Outstanding shall occur, the
principal amount of all the Debt Securities of that series (or, in the case of
any such Original Issue Discount Security or other Debt Security, such specified
amount) will automatically, and without any action by the Trustee or any Holder,
become immediately due and payable. Any payment by the Company on the
Subordinated Debt Securities following any such acceleration will be subject to
the subordination provisions of Article Fifteen of the Subordinated Indenture.
After any such acceleration, but before a judgment or decree based on
acceleration, the Holders of a majority in aggregate principal amount of the
Outstanding Securities of that series may, under certain circumstances, rescind
and annul such acceleration if all Events of Default, other than the non-payment
of accelerated principal (or other specified amount), have been cured or waived
as provided in the Indentures. (Section 502) For information as to waiver of
defaults, see "Modification and Waiver."
    
 
     Subject to the provisions of the Indentures relating to the duties of the
Trustee in case an Event of Default shall occur and be continuing, the Trustee
will be under no obligation to exercise any of its rights or powers under the
Indentures at the request or direction of any of the Holders, unless such
Holders shall have offered to the Trustee reasonable indemnity. (Section 603)
Subject to such provisions for the indemnification of the Trustee, the Holders
of a majority in aggregate principal amount of the Outstanding Securities of any
series will have the right to direct the time, method and place of conducting
any proceeding for any remedy available to the Trustee or exercising any trust
or power conferred on the Trustee with respect to the Debt Securities of that
series. (Section 512)
 
     No Holder of a Debt Security of any series will have any right to institute
any proceeding with respect to the Indentures, or for the appointment of a
receiver or a trustee, or for any other remedy thereunder, unless (i) such
Holder has previously given to the Trustee written notice of a continuing Event
of Default with respect to the Debt Securities of that series, (ii) the Holders
of at least 25% in aggregate principal amount of the Outstanding Securities of
that series have made a written request, and such Holder or Holders have offered
reasonable indemnity, to the Trustee to institute such proceeding as trustee and
(iii) the Trustee has failed to institute such proceeding, and has not received
from the Holders of a majority in aggregate principal amount of the Outstanding
Securities of that series a direction inconsistent with such request, within 60
days after such notice, request and offer. (Section 507) However, such
limitations do not apply to a suit instituted by a Holder of a Debt Security for
the enforcement of payment of the principal of or any premium or interest on
such Debt Security on or after the applicable due date specified in such Debt
Security. (Section 508)
 
     Each Indenture will include a covenant requiring the Company to furnish to
the Trustee annually a statement by certain of its officers as to whether or not
the Company, to their knowledge, is in default in the performance or observance
of any of the terms, provisions and conditions of the Indenture and, if so,
specifying all such known defaults. (Section 1004)
 
MODIFICATION AND WAIVER
 
     Modifications and amendments of the Indentures may be made by the Company
and the Trustee with the consent of the Holders of a majority in aggregate
principal amount of the Outstanding Securities of each series affected by such
modification or amendment; provided, however, that no such modification or
amendment may, without the consent of the Holder of each Outstanding Security
affected thereby, (a) change the Stated Maturity of the principal of, or any
installment of principal of or interest on, any Debt Security, (b) reduce the
principal amount of, or any premium or interest on, any Debt Security, (c)
reduce the amount of principal of an Original Issue Discount Security or any
other Debt Security payable upon acceleration of the Maturity thereof, (d)
change the place or currency of payment of principal of, or any premium or
interest on, any Debt Security, (e) impair the right to institute suit for the
enforcement of any payment on or with
 
                                       16
<PAGE>   18
 
   
respect to any Debt Security, (f) in the case of Subordinated Debt Securities,
modify the subordination provisions in a manner adverse to the Holders of the
Subordinated Debt Securities, (g) reduce the percentage in principal amount of
Outstanding Securities of any series, the consent of whose Holders is required
for modification or amendment of the Indenture, (h) reduce the percentage in
principal amount of Outstanding Securities of any series necessary for waiver of
compliance with certain provisions of the Indenture or for waiver of certain
defaults, (i) modify any of the provisions set forth in this paragraph except to
increase any such percentage or to provide that certain other provisions of the
Indenture may not be modified or waived without the consent of the Holder of
each Outstanding Debt Security affected thereby, or (j) if applicable, make any
change that adversely affects the right to convert or exchange any Debt Security
as provided in, and subject to the terms of, the Indenture. (Section 902)
    
 
     The Indentures will provide that the Holders of a majority in aggregate
principal amount of the Outstanding Securities of any series may waive, on
behalf of the Holders of all Debt Securities of such series, compliance by the
Company with certain restrictive provisions of the Indentures. (Section 1010 and
1008 of the Senior Indenture and the Subordinated Indenture, respectively). The
Holders of not less than a majority in principal amount of the Outstanding Debt
Securities of each series may, on behalf of all Holders of Debt Securities of
that series, waive any past default under the Indenture with respect to Debt
Securities of that series, except a default (a) in the payment of principal of
or any premium or interest on any Debt Security of such series or (b) in respect
of a covenant or provision of the Indenture which cannot be modified or amended
without the consent of the Holder of each Outstanding Debt Security of such
series affected. (Section 513)
 
     Each Indenture will provide that in determining whether the Holders of the
requisite principal amount of the Outstanding Securities have given or taken any
direction, notice, consent, waiver or other action under the Indenture as of any
date, or whether a quorum is present at a meeting of Holders of Debt Securities
(i) the principal amount of an Original Issue Discount Security that will be
deemed to be Outstanding will be the amount of the principal thereof that would
be due and payable as of such date upon acceleration of the Maturity thereof to
such date, (ii) if, as of such date, the principal amount payable at the Stated
Maturity of a Debt Security is not determinable (for example, because it is
based on an index), the principal amount of such Debt Security deemed to be
Outstanding as of such date will be an amount determined in the manner
prescribed for such Debt Security and (iii) the principal amount of a Debt
Security denominated in one or more foreign currencies or currency units that
will be deemed to be Outstanding will be the U.S. dollar equivalent, determined
as of such date in the manner prescribed for such Debt Security, of the
principal amount of such Debt Security (or, in the case of a Debt Security
described in clause (i) or (ii) above, of the amount described in such clause).
Certain Debt Securities, including those for whose payment or redemption money
has been deposited or set aside in trust for the Holders and those that have
been fully defeased pursuant to Section 1302, will not be deemed to be
Outstanding. (Section 101)
 
     Except in certain limited circumstances, the Company will be entitled to
set any day as a record date for the purpose of determining the Holders of
Outstanding Securities of any series entitled to give or take any direction,
notice, consent, waiver or other action under the Indentures, in the manner and
subject to the limitations provided in the Indentures. In certain limited
circumstances, the Trustee will be entitled to set a record date for action by
Holders. If a record date is set for any action to be taken by Holders of a
particular series, such action may be taken only by persons who are Holders of
Outstanding Securities of that series on the record date. To be effective, such
action must be taken by Holders of the requisite principal amount of such Debt
Securities within a specified period following the record date. For any
particular record date, this period will be 180 days or such other shorter
period as may be specified by the Company (or the Trustee, if it set the record
date), and may be shortened or lengthened (but not beyond 180 days) from time to
time. (Section 104)
 
                                       17
<PAGE>   19
 
DEFEASANCE AND COVENANT DEFEASANCE
 
     If and to the extent indicated in the applicable Prospectus Supplement, the
Company may elect, at its option at any time, to have the provisions of Section
1302, relating to defeasance and discharge of indebtedness, or Section 1303,
relating to defeasance of certain restrictive covenants in the Indentures,
applied to the Debt Securities of any series, or to any specified part of a
series. (Section 1301)
 
     DEFEASANCE AND DISCHARGE. The Indentures will provide that, upon the
Company's exercise of its option (if any) to have Section 1302 applied to any
Subordinated Debt Securities, the provisions of Article Fifteen of the
Subordinated Indenture relating to subordination will cease to be effective and,
with respect to any Debt Securities, the Company will be discharged from all its
obligations with respect thereto (except for certain obligations to exchange or
register the transfer of Debt Securities, to replace stolen, lost or mutilated
Debt Securities, to maintain paying agencies, to hold moneys for payment in
trust and, if applicable, to effect conversion of Debt Securities) upon the
deposit in trust for the benefit of the Holders of such Debt Securities of money
or U.S. Government Obligations, or both, which, through the payment of principal
and interest in respect thereof in accordance with their terms, will provide
money in an amount sufficient to pay the principal of and any premium and
interest on such Debt Securities on the respective Stated Maturities in
accordance with the terms of the Indentures and such Debt Securities. Such
defeasance or discharge may occur only if, among other things, the Company has
delivered to the Trustee an Opinion of Counsel to the effect that the Company
has received from, or there has been published by, the United States Internal
Revenue Service a ruling, or there has been a change in tax law, in either case
to the effect that Holders of such Debt Securities will not recognize gain or
loss for federal income tax purposes as a result of such deposit, defeasance and
discharge and will be subject to federal income tax on the same amount, in the
same manner and at the same times as would have been the case if such deposit,
defeasance and discharge were not to occur. (Sections 1302 and 1304)
 
     DEFEASANCE OF CERTAIN COVENANTS. The Indentures will provide that, upon the
Company's exercise of its option (if any) to have Section 1303 applied to any
Debt Securities, the Company may omit to comply with certain restrictive
covenants, including those described under "Certain Covenants of the Company"
and any that may be described in the applicable Prospectus Supplement, and the
occurrence of certain Events of Default, which are described above in clause (d)
(with respect to such restrictive covenants) under "Events of Default" and any
that may be described in the applicable Prospectus Supplement, will be deemed
not to be or result in an Event of Default, in each case with respect to such
Debt Securities, and, in the case of the Subordinated Indenture, the provisions
of Article Fifteen relating to subordination will cease to be effective with
respect to any Subordinated Debt Securities. The Company, in order to exercise
such option, will be required to deposit, in trust for the benefit of the
Holders of such Debt Securities, money or U.S. Government Obligations, or both,
which, through the payment of principal and interest in respect thereof in
accordance with their terms, will provide money in an amount sufficient to pay
the principal of and any premium and interest on such Debt Securities on the
respective Stated Maturities in accordance with the terms of the Indentures and
such Debt Securities. The Company will also be required, among other things, to
deliver to the Trustee an Opinion of Counsel to the effect that Holders of such
Debt Securities will not recognize gain or loss for federal income tax purposes
as a result of such deposit and defeasance of certain obligations and will be
subject to federal income tax on the same amount, in the same manner and at the
same times as would have been the case if such deposit and defeasance were not
to occur. In the event the Company exercised this option with respect to any
Debt Securities and such Debt Securities were declared due and payable because
of the occurrence of any Event of Default, the amount of money and U.S.
Government Obligations so deposited in trust would be sufficient to pay amounts
due on such Debt Securities at the time of their respective Stated Maturities
but may not be sufficient to pay amounts due on such Debt Securities upon any
acceleration resulting from such Event of Default. In such case, the Company
would remain liable for such payments. (Sections 1303 and 1304)
 
                                       18
<PAGE>   20
 
     The Company may, at its option, satisfy and discharge each of the
Indentures (except for certain obligations of the Company and the Trustee,
including, among others the obligations to apply money held in trust) when (i)
either (a) all Debt Securities under such Indenture previously authenticated and
delivered (other than (1) Debt Securities that were destroyed, lost or stolen
and that have been replaced or paid and (2) Debt Securities for the payment of
which money has been deposited in trust or segregated and held in trust by the
Company and thereafter repaid to the Company or discharged from such trust) have
been delivered to the Trustee for cancellation or discharge from such trust)
have been delivered to the Trustee for cancellation or (b) all such Debt
Securities under such Indenture not theretofore delivered to the Trustee for
cancellation (1) have become due and payable, (2) will become due and payable at
their Stated Maturity within one year, or (3) are to be called for redemption
within one year under arrangements satisfactory to the Trustee for the giving of
notice of redemption by the Trustee in the name and at the expense of the
Company, and the Company has deposited or caused to be deposited with the
Trustee as trust funds in trust for such purpose an amount sufficient to pay and
discharge the entire indebtedness on such Debt Securities under such Indenture
not previously delivered to the Trustee for cancellation, for principal and any
premium and interest to the date of such deposit (in the case of Debt Securities
under such Indenture which have become due and payable) or to the Stated
Maturity or redemption date as the case may be, (ii) the Company has paid or
caused to be paid all other sums payable under such Indenture by the Company,
and (iii) the Company has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel, each to the effect that all conditions precedent relating
to the satisfaction and discharge of such Indenture have been satisfied.
 
NOTICES
 
     Notices to Holders of Debt Securities will be given by mail to the
addresses of such Holders as they may appear in the Security Register. (Sections
101 and 106)
 
TITLE
 
     The Company, the Trustee and any agent of the Company or the Trustee may
treat the Person in whose name a Debt Security is registered as the absolute
owner thereof (whether or not such Debt Security may be overdue) for the purpose
of making payment and for all other purposes. (Section 308)
 
GOVERNING LAW
 
     The Indentures and the Debt Securities will be governed by, and construed
in accordance with, the law of the State of New York, without regard to conflict
of law principles thereof. (Section 112)
 
REGARDING THE TRUSTEE
 
     The Indentures contain certain limitations on the right of the Trustee,
should it become a creditor of the Company, to obtain payment of claims in
certain cases or to realize for its own account on certain property received in
respect of any such claim as security or otherwise. (Section 613) The Trustee is
permitted to engage in certain other transactions; however, if it acquires any
conflicting interest and there is a default under the Securities of any series
for which the Trustee serves as trustee, the Trustee must eliminate such
conflict or resign. (Section 608)
 
                          DESCRIPTION OF CAPITAL STOCK
 
   
     The authorized capital stock of the Company consists of 43,500,000 shares
of Class A Common Stock, 25,000,000 shares of Class B Common Stock (the "Class B
Common Stock") and 1,000,000 shares of Preferred Stock, each with a par value of
$0.01 per share.
    
 
                                       19
<PAGE>   21
 
     The following description of the capital stock of the Company and certain
provisions of the Company's Amended and Restated Certificate of Incorporation
and By-laws is a summary and is qualified in its entirety by the provisions of
the Amended and Restated Certificate of Incorporation and By-laws, which are
incorporated by reference as exhibits to the Registration Statement.
 
COMMON STOCK
 
   
     DIVIDENDS. Holders of record of shares of common stock are entitled to
receive such dividends when, if and as may be declared by the Board of Directors
out of funds legally available for such purposes. No dividends may be declared
or paid on any share of any class of common stock, unless such dividend, at the
same rate per share, is simultaneously declared or paid on each share of the
other class of common stock. In the case of a stock dividend or distribution,
holders of Class A Common Stock are entitled to receive the same percentage
dividend or distribution as holders of Class B Common Stock and vice versa,
except that stock dividends and distributions shall be made in Class A Common
Stock to the holders of Class A Common Stock and in Class B Common Stock to the
holders of Class B Common Stock.
    
 
   
     VOTING RIGHTS. Holders of Class A Common Stock are entitled to one vote per
share and holders of Class B Common Stock are entitled to four votes per share.
Holders of shares of common stock will vote as a single class on all matters
submitted to a vote of stockholders except with respect to future issuances of
Class B Common Stock and as otherwise required by law. The Amended and Restated
Certificate of Incorporation provides that all issuances of Class B Common Stock
must be approved by the affirmative vote of a majority of each class of common
stock, voting separately as a class, except with respect to (i) payment of stock
dividends on Class B Common Stock and (ii) a stock split, reclassification or
other subdivision of the Class B Common Stock. Under Delaware law, the
affirmative vote of the holders of a majority of the outstanding shares of any
class of common stock is required to approve, among other things, a change in
the designations, preferences or limitations of the shares of such class of
common stock.
    
 
   
     CONVERTIBILITY. Each Class B Common Stock is convertible, at the option of
its holder, into one share of Class A Common Stock at any time. The Class A
Common Stock is not convertible into Class B Common Stock. Each share of Class B
Common Stock shall automatically be converted into one share of Class A Common
Stock in the event (i) such share shall be transferred (including, without
limitation, by way of sale, assignment, exchange, gift, bequest, appointment or
otherwise) to any person or entity other than a "Permitted Transferee" or (ii)
the number of shares of Class B Common Stock outstanding at any time is equal to
or less than 10% of the total number of outstanding shares of Class B Common
Stock and Class A Common Stock. A "Permitted Transferee" includes (i) any other
holder of Class B Common Stock, (ii) any member of the Penny family (as defined
in the Voting Trust Agreement dated February 23, 1994, as amended (the "Voting
Trust")), or the Simon family (as defined in the Voting Trust), (iii) Gary F.
Seamans, his spouse or any of their descendants and (iv) certain other permitted
transferees.
    
 
   
     LIQUIDATION RIGHTS. Upon liquidation, dissolution or winding-up of the
Company, the holders of Class A Common Stock are entitled to share ratably with
the holders of Class B Common Stock in all assets available for distributions
after payment in full to creditors.
    
 
   
     OTHER PROVISIONS. The holders of common stock are not entitled to
preemptive or subscription rights. In any merger, consolidation or business
combination, the consideration to be received per share by holders of Class A
Common Stock must be identical to that received by holders of Class B Common
Stock. No class of common stock may be subdivided, consolidated, reclassified or
otherwise changed unless the other class of common stock concurrently is
subdivided, consolidated, reclassified or otherwise changed in the same
proportion and in the same manner. All outstanding shares are, and the Class A
Common Stock offered hereby will be upon issuance, validly issued, fully paid
and nonassessable.
    
 
                                       20
<PAGE>   22
 
PREFERRED STOCK
 
     The Board of Directors has the authority to issue up to 1,000,000 shares of
Preferred Stock in one or more series and to fix the rights, preferences,
privileges and restrictions thereof, including dividend rights, conversion
rights, voting rights, terms of redemption, liquidation preferences, sinking
fund terms and the number of shares constituting any series or the designation
of such series, without any further vote or action by stockholders. The issuance
of Preferred Stock could adversely affect the voting power of holders of both
classes of common stock and the likelihood that such holders will receive
dividend payments and payments upon liquidation and could have the effect of
delaying, deferring or preventing a change in control of the Company. The
Company has no present plan to issue any shares of Preferred Stock.
 
                              PLAN OF DISTRIBUTION
 
     The Company may sell the Securities separately or together, (i) to one or
more underwriters or dealers for public offering and sale by them and (ii) to
investors directly or through agents. The distribution of the Securities may be
effected from time to time in one or more transactions at a fixed price or
prices (which may be changed from time to time), at market prices prevailing at
the time of sale, at prices related to such prevailing market prices or at
negotiated prices. Each Prospectus Supplement will describe the method of
distribution of the Securities offered thereby.
 
     In connection with the sale of the Securities, underwriters, dealers or
agents may receive compensation from the Company or from purchasers of the
Securities for whom they may act as agents, in the form of discounts,
concessions or commissions. The underwriters, dealers or agents which
participate in the distribution of the Securities may be deemed to be
underwriters under the Securities Act and any discounts or commissions received
by them and any profit on the resale of the Securities received by them may be
deemed to be underwriting discounts and commissions thereunder. Any such
underwriter, dealer or agent will be identified and any such compensation
received from the Company will be described in the Prospectus Supplement. Any
initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.
 
     Under agreements that may be entered into with the Company, underwriters,
dealers and agents may be entitled to indemnification by the Company against
certain civil liabilities, including liabilities under the Securities Act, or to
contribution with respect to payments which the underwriters, dealers or agents
may be required to make in respect thereof.
 
     The Company may grant underwriters who participate in the distribution of
Securities an option to purchase additional Securities to cover over-allotments,
if any.
 
     Certain of the underwriters or agents and their associates may be customers
of, engage in transactions with or perform services for the Company in the
ordinary course of business.
 
                                 LEGAL MATTERS
 
     The legality of the securities offered hereby will be passed upon for the
Company by McDermott, Will & Emery, Chicago, Illinois.
 
                                    EXPERTS
 
     The consolidated financial statements and schedules of the Company as set
forth as of March 31, 1997 and 1996, and for each of the three years in the
period ended March 31, 1997, have been incorporated by references in this
Prospectus and in the Registration Statement on Form S-3, of which this
Prospectus is a part, in reliance upon the reports of Arthur Andersen LLP,
independent public accountants, incorporated by reference herein, and are
included in reliance upon the authority of such firm as experts in giving said
reports.
 
                                       21
<PAGE>   23
 
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following is an estimate, subject to future contingencies, of the
expenses to be incurred by the Registrant in connection with the issuance and
distribution of the securities being registered:
 
   
<TABLE>
<S>                                                           <C>
Registration Fee............................................        $ 90,910
*Legal Fees and Expense.....................................         250,000
*Trustee Fees and Expenses..................................          25,000
*Accounting Fees and Expenses...............................          75,000
*Blue Sky and Legal Investment Fees and Expenses............          10,000
*Printing and Engraving Fees................................         150,000
Rating Agency Fees..........................................  Not Applicable
*Listing Fees...............................................  Not Applicable
*Miscellaneous..............................................         $99,090
                                                              --------------
Total.......................................................        $700,000
                                                              ==============
</TABLE>
    
 
- ---------------
   
*Estimated pursuant to instruction to Item 511 of Regulation S-K.
    
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Under Delaware law, a corporation may indemnify any person who was or is a
party or is threatened to be made a party to an action (other than an action by
or in the right of the corporation) by reason of his service as a director or
officer of the corporation, or his service, at the corporation's request, as a
director, officer, employee or agent of another corporation or other enterprise,
against expenses (including attorneys' fees) that are actually and reasonably
incurred by him ("Expenses"), and judgments, fines and amounts paid in
settlement that are actually and reasonably incurred by him, in connection with
the defense or settlement of such action, provided that he acted in good faith
and in a manner he reasonably believed to be in or not opposed to the
corporation's best interests and, with respect to any criminal action or
proceeding, had no reasonable cause to believe that his conduct was unlawful.
Although Delaware law permits a corporation to indemnify any person referred to
above against Expenses in connection with the defense or settlement of an action
by or in the right of the corporation, provided that he acted in good faith and
in a manner he reasonably believed to be in or not opposed to the corporation's
best interests, if such person has been judged liable to the corporation,
indemnification is only permitted to the extent that the Court of Chancery (or
the court in which the action was brought) determines that, despite the
adjudication of liability, such person is entitled to indemnity for such
Expenses as the court deems proper. The determination as to whether a person
seeking indemnification has met the required standard of conduct is to be made
(1) by a majority vote of a quorum of disinterested members of the board of
directors, or (2) by independent legal counsel in a written opinion, if such a
quorum does not exist or if the disinterested directors so direct, or (3) by the
stockholders. The General Corporation Law of the State of Delaware also provides
for mandatory indemnification of any director, officer, employee or agent
against Expenses to the extent such person has been successful in any proceeding
covered by the statute. In addition, the General Corporation Law of the State of
Delaware provides the general authorization of advancement of a director's or
officer's litigation expenses in lieu of requiring the authorization of such
advancement by the board of directors in specific cases, and that
indemnification and advancement of expenses provided by the statute shall not be
deemed exclusive of any other rights to which those seeking indemnification or
advancement of expenses may be entitled under any bylaw, agreement or otherwise.
 
     The Company's Amended and Restated Certificate of Incorporation and the
Company's Amended and Restated By-laws provide for indemnification of the
Company's directors, officers, employees and other agents to the fullest extent
not prohibited by the Delaware law.
 
                                      II-1
<PAGE>   24
 
     The Company understands that the staff of the Securities and Exchange
Commission is of the opinion that statutory, charter and contractual provisions
as are described above have no effect on claims arising under the federal
securities laws.
 
     The Company maintains liability insurance for the benefit of its directors
and officers.
 
ITEM 16. EXHIBITS
 
     The following Exhibits are filed as part of this Registration Statement:
 
   
<TABLE>
<S>        <C>
 *1.1(a)   Form of Underwriting Agreement for Debt Securities.
 *1.1(b)   Form of Underwriting Agreement for Class A Common Stock.
  4.1      Amended and Restated Certificate of Incorporation, as
           amended (incorporated herein by reference to Exhibit 3.2 to
           Westell Technologies, Inc.'s Registration Statement on Form
           S-1, as amended, Registration No. 33-98024).
  4.2      Amended and Restated By-laws (incorporated herein by
           reference to Exhibit 3.3 to Westell Technologies, Inc.'s
           Registration Statement on Form S-1, as amended, Registra-
           tion No. 33-98024).
  4.3      Form of Senior Indenture.
  4.4      Form of Subordinated Indenture.
  4.5      Form of Senior Security (included in Exhibit 4.3).
  4.6      Form of Subordinated Security (included in Exhibit 4.4).
  5.1      Opinion of McDermott, Will & Emery.
  9.1      Voting Trust Agreement dated February 23, 1994, as amended
           (incorporated herein by reference to Exhibit 9.1 to Westell
           Technologies, Inc.'s Registration Statement on Form S-1, as
           amended, Registration No. 33-98024).
 12.1      Statement Regarding Computation of Ratios.
 21.1      Subsidiaries of the Registrant (incorporated herein by
           reference to Exhibit 21.1 to Westell Technologies, Inc.'s
           Registration Statement on Form S-1, as amended, Registration
           No. 33-98024).
 23.1      Consent of Arthur Andersen LLP.
 23.2      Consent of McDermott, Will & Emery (included in Exhibit
           5.1).
+24.1      Powers of Attorney of certain officers and the directors of
           Westell Technologies, Inc.
 25.1      Statement of Eligibility of Trustee on Form T-1 of LaSalle
           National Bank, as trustee for the Senior Debt Securities.
 25.2      Statement of Eligibility of Trustee on Form T-1 of LaSalle
           National Bank, as trustee for the Subordinated Debt
           Securities.
</TABLE>
    
 
- ------------------------------
   
* To be filed on a Current Report on Form 8-K.
    
   
+ Previously Filed.
    
 
ITEM 17. UNDERTAKINGS
 
     (a) The Registrant hereby undertakes:
 
          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement (i) to
     include any prospectus required by Section 10(a)(3) of the Securities Act
     of 1933, (ii) to reflect in the prospectus any facts or events arising
     after the effective date of the Registration Statement (or the most recent
     post-effective amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     Registration Statement, notwithstanding the foregoing, any
 
                                      II-2
<PAGE>   25
 
     increase or decrease in volume of securities offered (if the total dollar
     value of securities offered would not exceed that which was registered) and
     any deviation from the low or high and of the estimated maximum offering
     range may be reflected in the form of prospectus filed with the Commission
     pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
     price represent no more than a 20 percent change in the maximum aggregate
     offering price set forth in the "Calculation of Registration Fee" table in
     the effective Registration Statement, and (iii) to include any material
     information with respect to the plan of distribution not previously
     disclosed in the Registration Statement or any material change to such
     information in the Registration Statement;
 
     PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if
the information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed with or furnished to the
Commission by the Registrant pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934 that are incorporated by reference in the Registration
Statement.
 
          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial BONA FIDE offering thereof.
 
          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
     (b) The Registrant hereby undertakes that, for purposes of determining any
liability under the Securities Act of 1933, each filing of the Registrant's
annual report pursuant to Section 13(a) or Section 15(d) of the Securities
Exchange Act of 1934 that is incorporated by reference in the Registration
Statement shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial BONA FIDE offering thereof.
 
     (c) The Registrant hereby undertakes to file an application for the purpose
of determining the eligibility of the trustee to act under subsection (a) of
Section 310 of the Trust Indenture Act ("Act") in accordance with the rules and
regulations prescribed by the Securities and Exchange Commission under Section
305(b)(2) of the Act.
 
     (d) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers, and controlling persons of
the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer, or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer, or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the
final adjudication of such issue.
 
                                      II-3
<PAGE>   26
 
                                   SIGNATURES
 
   
    Pursuant to the requirements of the Securities Act of 1933, the Company
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement, or amendment thereto, to be signed on its behalf by the undersigned,
thereunto duly authorized on the day of December 1, 1997.
    
 
                                          WESTELL TECHNOLOGIES, INC.
 
   
                                          By:    /s/ STEPHEN J. HAWRYSZ
                                            ------------------------------------
                                                     Stephen J. Hawrysz
                                               Chief Financial Officer, Vice
                                                          President,
                                                  Secretary and Treasurer
    
 
                               POWER OF ATTORNEY
 
   
    Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrant and in the capacities and on December 1, 1997.
    
 
   
<TABLE>
<CAPTION>
                   SIGNATURE                                                TITLE
                   ---------                                                -----
<C>                                                 <S>
                       *                            Chairman of the Board of Directors, President and
- ------------------------------------------------    Chief Executive Officer (Principal Executive Officer)
                Gary F. Seamans
 
                       *                            Vice-Chairman of the Board of Directors
- ------------------------------------------------
                Robert H. Gaynor
 
              /s/ MELVIN J. SIMON                   Assistant Secretary and Treasurer and Director
- ------------------------------------------------
                Melvin J. Simon
 
                       *                            Chief Financial Officer, Vice President, Secretary and
- ------------------------------------------------    Treasurer (Principal Financial Officer and Principal
               Stephen J. Hawrysz                   Accounting Officer)
 
                       *                            Director
- ------------------------------------------------
                Stefan D. Abrams
 
                       *                            Director
- ------------------------------------------------
               Michael A. Brunner
 
                       *                            Director
- ------------------------------------------------
                 Paul A. Dwyer
 
                       *                            Director
- ------------------------------------------------
                 Ormand J. Wade
 
        * Pursuant to Power of Attorney
              /s/ MELVIN J. SIMON
- ------------------------------------------------
                Melvin J. Simon
</TABLE>
    
 
                                      II-4

<PAGE>   1
                                                                EXHIBIT 4.3



                           Westell Technologies, Inc.

                                       To

                             LaSalle National Bank,


                                   as Trustee

                                      
                               _______________
                               
                                  Indenture

                       Dated as of _______________, 1997


                               _______________


                          Subordinated Debt Securities

<PAGE>   2

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                ----
<S>                                                                                                             <C>
ARTICLE ONE DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION . . . . . . . . . . . . . . . . . . . . . .   1
                                                                                                                
         SECTION 101. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                 Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Affiliate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 control  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Authenticating Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Board of Directors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Board Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Business Day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Commission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Common Stock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
                 Company  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Company Request  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Company Order  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Corporate Trust Office . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 corporation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Covenant Defeasance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Defaulted Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Depositary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Designated Senior Debt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Event of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Exchange Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Expiration Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Global Security  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
                 Holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Indenture  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Interest Payment Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Investment Company Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Maturity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Notice of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Officers' Certificate  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
                 Opinion of Counsel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Original Issue Discount Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Outstanding  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
                 Paying Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Payment Blockage Notice  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Person . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Place of Payment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
</TABLE>





                                         -i-

<PAGE>   3

                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                              ----
<S>                                                                                                           <C>
                 Predecessor Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Redemption Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Redemption Price . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Regular Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Representative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Securities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
                 Securities Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Security Register  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Security Registrar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Senior Debt  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Special Record Date  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
                 Stated Maturity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Subsidiary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 U.S. Government Obligation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
                 Vice President . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
         SECTION 102.       Compliance Certificates and Opinions  . . . . . . . . . . . . . . . . . . . . . .   8
         SECTION 103.       Form of Documents Delivered to Trustee  . . . . . . . . . . . . . . . . . . . . .   9
         SECTION 104.       Acts of Holders; Record Dates . . . . . . . . . . . . . . . . . . . . . . . . . .   9
         SECTION 105.       Notices, Etc., to Trustee and Company . . . . . . . . . . . . . . . . . . . . . .  11
         SECTION 106.       Notice to Holders; Waiver . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         SECTION 107.       Conflict with Trust Indenture Act . . . . . . . . . . . . . . . . . . . . . . . .  12
         SECTION 108.       Effect of Headings and Table of Contents  . . . . . . . . . . . . . . . . . . . .  12
         SECTION 109.       Successors and Assigns  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
         SECTION 110.       Separability Clause . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 111.       Benefits of Indenture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 112.       Governing Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 113.       Legal Holidays  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  13
         SECTION 114.       Indenture and Securities Solely Corporate Obligations . . . . . . . . . . . . . .  13
         SECTION 115.       Indenture May be Executed in Counterparts . . . . . . . . . . . . . . . . . . . .  14
                                                                                                              
ARTICLE TWO  SECURITY FORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
                                                                                                              
         SECTION 201.       Forms Generally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         SECTION 202.       Form of Face of Security  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
         SECTION 203.       Form of Reverse of Security . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
         SECTION 204.       Form of Legend for Global Securities  . . . . . . . . . . . . . . . . . . . . . .  21
</TABLE>





                                        -ii-
<PAGE>   4

                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>
                                                                                                             PAGE
                                                                                                             ----
<S>                                                                                                            <C>
         SECTION 205.       Form of Trustee's Certificate of Authentication . . . . . . . . . . . . . . . . . 21
         SECTION 206.       Form of Conversion Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
                                                                                                            
ARTICLE THREE  THE SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
                                                                                                            
         SECTION 301.       Amount Unlimited; Issuable in Series  . . . . . . . . . . . . . . . . . . . . . . 22
         SECTION 302.       Denominations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
         SECTION 303.       Execution, Authentication, Delivery and Dating  . . . . . . . . . . . . . . . . . 25
         SECTION 304.       Temporary Securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
         SECTION 305.       Registration; Registration of Transfer and Exchange . . . . . . . . . . . . . . . 27
         SECTION 306.       Mutilated, Destroyed, Lost and Stolen Securities  . . . . . . . . . . . . . . . . 29
         SECTION 307.       Payment of Interest; Interest Rights Preserved  . . . . . . . . . . . . . . . . . 30
         SECTION 308.       Persons Deemed Owners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
         SECTION 309.       Cancellation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
         SECTION 310.       Computation of Interest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
                                                                                                            
ARTICLE FOUR  SATISFACTION AND DISCHARGE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
                                                                                                            
         SECTION 401.       Satisfaction and Discharge of Indenture . . . . . . . . . . . . . . . . . . . . . 32
         SECTION 402.       Application of Trust Money  . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
                                                                                                            
ARTICLE FIVE  REMEDIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
                                                                                                            
         SECTION 501.       Events of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
         SECTION 502.       Acceleration of Maturity; Rescission and Annulment  . . . . . . . . . . . . . . . 34
         SECTION 503.       Collection of Indebtedness and Suits for Enforcement by Trustee . . . . . . . . . 35
         SECTION 504.       Trustee May File Proofs of Claim  . . . . . . . . . . . . . . . . . . . . . . . . 36
         SECTION 505.       Trustee May Enforce Claims Without Possession of Securities . . . . . . . . . . . 36
         SECTION 506.       Application of Money Collected  . . . . . . . . . . . . . . . . . . . . . . . . . 36
         SECTION 507.       Limitation on Suits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
         SECTION 508.       Unconditional Right of Holders to Receive Principal,                            
                            Premium and Interest and to Convert . . . . . . . . . . . . . . . . . . . . . . . 37
         SECTION 509.       Restoration of Rights and Remedies  . . . . . . . . . . . . . . . . . . . . . . . 38
         SECTION 510.       Rights and Remedies Cumulative  . . . . . . . . . . . . . . . . . . . . . . . . . 38
         SECTION 511.       Delay or Omission Not Waiver  . . . . . . . . . . . . . . . . . . . . . . . . . . 38
         SECTION 512.       Control by Holders  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
         SECTION 513.       Waiver of Past Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
         SECTION 514.       Undertaking for Costs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
         SECTION 515.       Waiver of Usury, Stay or Extension Laws . . . . . . . . . . . . . . . . . . . . . 39
</TABLE>





                                        -iii-
<PAGE>   5

                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>                                                                                                                          
                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
ARTICLE SIX  THE TRUSTEE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
                                                                                                 
         SECTION 601.       Certain Duties and Responsibilities . . . . . . . . . . . . . . . . . . . . . . 39
         SECTION 602.       Notice of Defaults  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
         SECTION 603.       Certain Rights of Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
         SECTION 604.       Not Responsible for Recitals or Issuance of Securities  . . . . . . . . . . . . 41
         SECTION 605.       May Hold Securities and Act as Trustee Under Other Indentures . . . . . . . . . 41
         SECTION 606.       Money Held in Trust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
         SECTION 607.       Compensation and Reimbursement  . . . . . . . . . . . . . . . . . . . . . . . . 42
         SECTION 608.       Conflicting Interests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
         SECTION 609.       Corporate Trustee Required; Eligibility . . . . . . . . . . . . . . . . . . . . 42
         SECTION 610.       Resignation and Removal; Appointment of Successor . . . . . . . . . . . . . . . 43
         SECTION 611.       Acceptance of Appointment by Successor  . . . . . . . . . . . . . . . . . . . . 44
         SECTION 612.       Merger, Conversion, Consolidation or Succession to Business . . . . . . . . . . 45
         SECTION 613.       Preferential Collection of Claims Against Company . . . . . . . . . . . . . . . 45
         SECTION 614.       Appointment of Authenticating Agent . . . . . . . . . . . . . . . . . . . . . . 45
                                                                                                 
ARTICLE SEVEN  HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY  . . . . . . . . . . . . . . . . . . . . . 47
                                                                                                 
         SECTION 701.       Company to Furnish Trustee Names and Addresses of Holders . . . . . . . . . . . 47
         SECTION 702.       Preservation of Information; Communications to Holders  . . . . . . . . . . . . 47
         SECTION 703.       Reports by Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
         SECTION 704.       Reports by Company  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
                                                                                                 
ARTICLE EIGHT  CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE . . . . . . . . . . . . . . . . . . . . 48
                                                                                                 
         SECTION 801.       Company May Consolidate, Etc., Only on Certain Terms  . . . . . . . . . . . . . 48
         SECTION 802.       Successor Substituted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
                                                                                                 
ARTICLE NINE  SUPPLEMENTAL INDENTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
                                                                                                 
         SECTION 901.       Supplemental Indentures Without Consent of Holders  . . . . . . . . . . . . . . 49
         SECTION 902.       Supplemental Indentures With Consent of Holders . . . . . . . . . . . . . . . . 51
         SECTION 903.       Execution of Supplemental Indentures  . . . . . . . . . . . . . . . . . . . . . 52
         SECTION 904.       Effect of Supplemental Indentures . . . . . . . . . . . . . . . . . . . . . . . 52
         SECTION 905.       Conformity with Trust Indenture Act . . . . . . . . . . . . . . . . . . . . . . 52
         SECTION 906.       Reference in Securities to Supplemental Indentures  . . . . . . . . . . . . . . 52
         SECTION 907.       Subordination Unimpaired  . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
</TABLE>


                                        -iv-
<PAGE>   6

                               TABLE OF CONTENTS
                                  (CONTINUED)

<TABLE>
<CAPTION>

                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
ARTICLE TEN  COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
                                                                                                 
         SECTION 1001.      Payment of Principal, Premium and Interest  . . . . . . . . . . . . . . . . . . 53
         SECTION 1002.      Maintenance of Office or Agency . . . . . . . . . . . . . . . . . . . . . . . . 53
         SECTION 1003.      Money for Securities Payments to Be Held in Trust . . . . . . . . . . . . . . . 53
         SECTION 1004.      Statement by Officers as to Default . . . . . . . . . . . . . . . . . . . . . . 54
         SECTION 1005.      Existence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
         SECTION 1006.      Maintenance of Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
         SECTION 1007.      Payment of Taxes and Other Claims . . . . . . . . . . . . . . . . . . . . . . . 55
         SECTION 1008.      Waiver of Certain Covenants . . . . . . . . . . . . . . . . . . . . . . . . . . 55
                                                                                                 
ARTICLE ELEVEN  REDEMPTION OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
                                                                                                 
         SECTION 1101.      Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
         SECTION 1102.      Election to Redeem; Notice to Trustee . . . . . . . . . . . . . . . . . . . . . 56
         SECTION 1103.      Selection by Trustee of Securities to Be Redeemed . . . . . . . . . . . . . . . 56
         SECTION 1104.      Notice of Redemption  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
         SECTION 1105.      Deposit of Redemption Price . . . . . . . . . . . . . . . . . . . . . . . . . . 58
         SECTION 1106.      Securities Payable on Redemption Date . . . . . . . . . . . . . . . . . . . . . 58
         SECTION 1107.      Securities Redeemed in Part . . . . . . . . . . . . . . . . . . . . . . . . . . 59
                                                                                                 
ARTICLE TWELVE  SINKING FUNDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
                                                                                                 
         SECTION 1201.      Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
         SECTION 1202.      Satisfaction of Sinking Fund Payments with Securities . . . . . . . . . . . . . 59
         SECTION 1203.      Redemption of Securities for Sinking Fund . . . . . . . . . . . . . . . . . . . 59
                                                                                                 
ARTICLE THIRTEEN  DEFEASANCE AND COVENANT DEFEASANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
                                                                                                 
         SECTION 1301.      Company's Option to Effect Defeasance or Covenant Defeasance  . . . . . . . . . 60
         SECTION 1302.      Defeasance and Discharge  . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
         SECTION 1303.      Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
         SECTION 1304.      Conditions to Defeasance or Covenant Defeasance . . . . . . . . . . . . . . . . 61
         SECTION 1305.      Deposited Money and U.S. Government Obligations                      
                            to be Held in Trust; Miscellaneous Provisions . . . . . . . . . . . . . . . . . 63
         SECTION 1306.      Reinstatement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
                                                                                                 
ARTICLE FOURTEEN  CONVERSION OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
                                                                                                 
         SECTION 1401.      Applicability of Article  . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
</TABLE> 

                                         -v-

<PAGE>   7

                               TABLE OF CONTENTS
                                  (CONTINUED)   

<TABLE> 
<CAPTION>
                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
         SECTION 1402.      Exercise of Conversion Privilege  . . . . . . . . . . . . . . . . . . . . . . . 64
         SECTION 1403.      No Fractional Shares  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
         SECTION 1404.      Adjustment of Conversion Price  . . . . . . . . . . . . . . . . . . . . . . . . 66
         SECTION 1405.      Notice of Certain Corporate Actions . . . . . . . . . . . . . . . . . . . . . . 66
         SECTION 1406.      Reservation of Shares of Common Stock . . . . . . . . . . . . . . . . . . . . . 67
         SECTION 1407.      Payment of Certain Taxes Upon Conversion  . . . . . . . . . . . . . . . . . . . 67
         SECTION 1408.      Nonassessability  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
         SECTION 1409.      Provision in Case of Consolidation, Merger or Sale of Assets  . . . . . . . . . 67
         SECTION 1410.      Duties of Trustee Regarding Conversion  . . . . . . . . . . . . . . . . . . . . 68
         SECTION 1411.      Repayment of Certain Funds Upon Conversion  . . . . . . . . . . . . . . . . . . 69
                                                                                                 
ARTICLE FIFTEEN  SUBORDINATION OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
                                                                                                 
         SECTION 1501.      Securities Subordinate to Senior Debt . . . . . . . . . . . . . . . . . . . . . 69
         SECTION 1502.      Payment Over of Proceeds Upon Dissolution, Etc  . . . . . . . . . . . . . . . . 70
         SECTION 1503.      Prior Payment to Senior Debt Upon Acceleration of Securities  . . . . . . . . . 71
         SECTION 1504.      No Payment in Certain Circumstances.  . . . . . . . . . . . . . . . . . . . . . 72
         SECTION 1505.      Payment Permitted If No Default . . . . . . . . . . . . . . . . . . . . . . . . 73
         SECTION 1506.      Subrogation to Rights of Holders of Senior Debt . . . . . . . . . . . . . . . . 73
         SECTION 1507.      Provisions Solely to Define Relative Rights . . . . . . . . . . . . . . . . . . 74
         SECTION 1508.      Trustee to Effectuate Subordination . . . . . . . . . . . . . . . . . . . . . . 74
         SECTION 1509.      No Waiver of Subordination Provisions . . . . . . . . . . . . . . . . . . . . . 74
         SECTION 1510.      Notice to Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
         SECTION 1511.      Reliance on Judicial Order or Certificate of Liquidating Agent  . . . . . . . . 75
         SECTION 1512.      Trustee Not Fiduciary for Holders of Senior Debt  . . . . . . . . . . . . . . . 76
         SECTION 1513.      Rights of Trustee as Holder of Senior Debt;                          
                            Preservation of Trustee's Rights . .  . . . . . . . . . . . . . . . . . . . . . 76
         SECTION 1514.      Article Applicable to Paying Agents . . . . . . . . . . . . . . . . . . . . . . 76
         SECTION 1515.      Certain Conversions Deemed Payment  . . . . . . . . . . . . . . . . . . . . . . 76
         SECTION 1516.      Obligations of Company and Right to Convert Unconditional . . . . . . . . . . . 76
         SECTION 1517.      Reliance by Holders of Senior Indebtedness on Subordination Provision           77
</TABLE> 





                                        -vi-

<PAGE>   8


                           WESTELL TECHNOLOGIES, INC.

          Certain Sections of this Indenture relating to Sections 310
          through 318, inclusive, of the Trust Indenture Act of 1939:

<TABLE>
<CAPTION>
                                   Trust Indenture                                                 Indenture
                                     Act Section                                                    Section
                                 <S>                                                          <C>
                                 Section 310(a)(1)    . . . . . . . . . . . . . . . . . . . . .609
                                            (a)(2)    . . . . . . . . . . . . . . . . . . . . .609
                                            (a)(3)    . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (a)(4)    . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (b)       . . . . . . . . . . . . . . . . . . . . .608, 610
                                 Section 311(a)       . . . . . . . . . . . . . . . . . . . . .613
                                            (b)       . . . . . . . . . . . . . . . . . . . . .613
                                 Section 312(a)       . . . . . . . . . . . . . . . . . . . . .701, 702
                                            (b)       . . . . . . . . . . . . . . . . . . . . .702
                                            (c)       . . . . . . . . . . . . . . . . . . . . .702
                                 Section 313(a)       . . . . . . . . . . . . . . . . . . . . .703
                                            (b)       . . . . . . . . . . . . . . . . . . . . .703
                                            (c)       . . . . . . . . . . . . . . . . . . . . .703
                                            (d)       . . . . . . . . . . . . . . . . . . . . .703
                                 Section 314(a)       . . . . . . . . . . . . . . . . . . . . .704
                                            (a)(4)    . . . . . . . . . . . . . . . . . . . . .101, 1004
                                            (b)       . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (c)(1)    . . . . . . . . . . . . . . . . . . . . .102
                                            (c)(2)    . . . . . . . . . . . . . . . . . . . . .102
                                            (c)(3)    . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (d)       . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (e)       . . . . . . . . . . . . . . . . . . . . .102
                                 Section 315(a)       . . . . . . . . . . . . . . . . . . . . .601
                                            (b)       . . . . . . . . . . . . . . . . . . . . .602
                                            (c)       . . . . . . . . . . . . . . . . . . . . .601
                                            (d)       . . . . . . . . . . . . . . . . . . . . .601
                                            (e)       . . . . . . . . . . . . . . . . . . . . .514
                                 Section 316(a)       . . . . . . . . . . . . . . . . . . . . .101
                                            (a)(1)(A) . . . . . . . . . . . . . . . . . . . . .502, 512
                                            (a)(1)(B) . . . . . . . . . . . . . . . . . . . . .513
                                            (a)(2)    . . . . . . . . . . . . . . . . . . . . .Not Applicable
                                            (b)       . . . . . . . . . . . . . . . . . . . . .508
                                            (c)       . . . . . . . . . . . . . . . . . . . . .104
</TABLE>

                                        -vii-

<PAGE>   9


<TABLE>
<S>                                                                                           <C>       
                                 Section 317(a)(1)    . . . . . . . . . . . . . . . . . . . . .  503
                                            (a)(2)    . . . . . . . . . . . . . . . . . . . . .  504
                                            (b)       . . . . . . . . . . . . . . . . . . . . . 1003
                                 Section 318(a)       . . . . . . . . . . . . . . . . . . . . .  107
                                           
</TABLE>
- ---------------------------------
NOTE:     This reconciliation and tie shall not, for any purpose, be deemed to
be a part of the Indenture.


                                     viii
<PAGE>   10
                                                                EXHIBIT 4.3




         INDENTURE, dated as of _______________, 1997, between Westell
Technologies, Inc., a corporation duly organized and existing under the laws of
the State of Delaware (herein called the "Company"), having its principal
executive office at 750 N. Commons Drive, Aurora, Illinois 60504, and LaSalle
National Bank, a national banking association duly organized and existing under
the laws of the United States of America, as Trustee (herein called the
"Trustee").

                            RECITALS OF THE COMPANY

         The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series as provided in this
Indenture.

         All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

                   NOW, THEREFORE, THIS INDENTURE WITNESSETH:

         For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually covenanted and agreed, for
the equal and proportionate benefit of all Holders of the Securities or of
series thereof appertaining, as follows:

                                  ARTICLE ONE

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

SECTION 101.     DEFINITIONS.

         For all purposes of this Indenture, except as otherwise expressly
provided or unless the context otherwise requires:

         (1)     the terms defined in this Article have the meanings assigned
to them in this Article and include the plural as well as the singular;

         (2)     all other terms used herein which are defined in the Trust
Indenture Act, either directly or by reference therein, have the meanings
assigned to them therein;

         (3)     all accounting terms not otherwise defined herein have the
meanings assigned to them in accordance with generally accepted accounting
principles, and, except as otherwise herein expressly provided, the term
"generally accepted accounting principles" with respect to any computation
required or permitted hereunder shall mean such accounting principles as are
generally accepted at the date of such computation;

         (4)     unless the context otherwise requires, any reference to an
"Article" or a "Section" refers to an Article or a Section, as the case may be,
of this Indenture; and

<PAGE>   11

         (5)     the words "herein," "hereof" and "hereunder" and other words
of similar import refer to this Indenture as a whole and not to any particular
Article, Section or other subdivision.

         "Act," when used with respect to any Holder, has the meaning specified
in Section 104.

         "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

         "Authenticating Agent" means any Person authorized by the Trustee
pursuant to Section 614 to act on behalf of the Trustee to authenticate
Securities of one or more series.

         "Board of Directors" means either the board of directors of the
Company or any duly authorized committee of that board empowered to act for it
with respect to this Indenture.

         "Board Resolution" means a copy of a resolution certified by the
Secretary or an Assistant Secretary of the Company to have been duly adopted by
the Board of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

         "Business Day," when used with respect to any Place of Payment, means
each Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on
which banking institutions in that Place of Payment are authorized or obligated
by law or executive order to close.

         "Commission" means the Securities and Exchange Commission, from time
to time constituted, created under the Exchange Act, or, if at any time after
the execution of this instrument such Commission is not existing and performing
the duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

         "Common Stock" means the Class A Common Stock, $.01 par value per
share, of the Company authorized at the date of this instrument as originally
executed. Subject to the provisions of Section 1409, shares issuable on
conversion or repurchase of Securities shall include only shares of Common
Stock or shares of any class or classes of common stock resulting from any
reclassification or reclassifications thereof; provided, however, that if at
any time there shall be more than one such resulting class, the shares so
issuable on conversion of Securities shall include shares of all such classes,
and the shares of each such class then so issuable shall be substantially in
the proportion which the total number of shares of such class resulting from
all such reclassifications bears to the total number of shares of all such
classes resulting from all such reclassifications.

         "common stock" includes any stock of any class of capital stock which
has no preference in respect of dividends or of amounts payable in the event of
any voluntary or involuntary liquidation,



                                     -2-

<PAGE>   12

dissolution or winding up of the issuer thereof and which is not subject to
redemption by the issuer thereof.

         "Company" means the corporation named as the "Company" in the first
paragraph of this instrument until a successor Person shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor Person.

         "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman of the Board, its Vice
Chairman of the Board, its President or a Vice President, and by its principal
financial officer, its Treasurer, an Assistant Treasurer, its Secretary or an
Assistant Secretary, and delivered to the Trustee.

         "Corporate Trust Office" means the corporate trust office of the
Trustee at 135 South LaSalle Street, Chicago, Illinois  60674-9135, at which at
any particular time its corporate trust business shall be administered.

         "corporation" means a corporation, association, company, joint-stock
company or business trust.

         "Covenant Defeasance" has the meaning specified in Section 1303.

         "Defaulted Interest" has the meaning specified in Section 307.

         "Defeasance" has the meaning specified in Section 1302.

         "Depositary" means, with respect to Securities of any series issuable
in whole or in part in the form of one or more Global Securities, a clearing
agency registered under the Exchange Act that is designated to act as
Depositary for such Securities as contemplated by Section 301.

         "Designated Senior Debt" means the Company's obligations under certain
existing Senior Debt and the Company's obligations under any particular Senior
Debt in which the instrument creating or evidencing the same or the assumption
or guarantee thereof (or related agreements or documents to which the Company
is a party) expressly provides that such Senior Debt shall be "Designated
Senior Debt" for purposes of this Indenture (provided that such instrument,
agreement or other document may place limitations and conditions on the right
of such Senior Debt to exercise the rights of Designated Senior Debt).

         "Event of Default" has the meaning specified in Section 501.

         "Exchange Act" means the Securities Exchange Act of 1934 and any
statute successor thereto, in each case as amended from time to time.

         "Expiration Date" has the meaning specified in Section 104.





                                         -3-
<PAGE>   13

         "Global Security" means a Security that evidences all or part of the
Securities of any series and bears the legend set forth in Section 204 (or such
legend as may be specified as contemplated by Section 301 for such Securities).

         "Holder" means a Person in whose name a Security is registered in the
Security Register.

         "Indenture" means this instrument as originally executed and as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof,
including, for all purposes of this instrument and any such supplemental
indenture, the provisions of the Trust Indenture Act that are deemed to be a
part of and govern this instrument and any such supplemental indenture,
respectively.  The term "Indenture" shall also include the terms of particular
series of Securities established as contemplated by Section 301; provided,
however, that if at any time more than one Person is acting as Trustee under
this Indenture due to the appointment of one or more separate Trustees for any
one or more separate series of Securities, "Indenture" shall mean, with respect
to such series of Securities for which any such Person is Trustee, this
instrument as originally executed or as it may from time to time be
supplemented or amended by one or more indentures supplemental hereto entered
into pursuant to the applicable provisions hereof and shall include the terms
of particular series of Securities for which such Person is Trustee established
as contemplated by Section 301, exclusive, however, of any provisions or terms
which relate solely to other series of Securities for which such Person is not
Trustee, regardless of when such terms or provisions were adopted, and
exclusive of any provisions or terms adopted by means of one or more indentures
supplemental hereto executed and delivered after such person had become such
Trustee, but to which such person, as such Trustee, was not a party; provided,
further that in the event that this Indenture is supplemented or amended by one
or more indentures supplemental hereto which are only applicable to certain
series of Securities, the term "Indenture" for a particular series of
Securities shall only include the supplemental indentures applicable thereto.

         "interest," when used with respect to an Original Issue Discount
Security which by its terms bears interest only after Maturity, means interest
payable after Maturity.

         "Interest Payment Date," when used with respect to any Security, means
the Stated Maturity of an instalment of interest on such Security.

         "Investment Company Act" means the Investment Company Act of 1940 and
any statute successor thereto, in each case as amended from time to time.

         "Maturity," when used with respect to any Security, means the date on
which the principal of such Security or an instalment of principal becomes due
and payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption, repurchase at the option of
the Holder or otherwise.

         "Notice of Default" means a written notice of the kind specified in
Section 501(4).


                                         -4-
<PAGE>   14

         "Officers' Certificate" means a certificate signed by the Chairman of
the Board, a Vice Chairman of the Board, the President or a Vice President, and
by the principal financial officer, the Treasurer, an Assistant Treasurer, the
Secretary or an Assistant Secretary, of the Company, and delivered to the
Trustee.  One of the officers signing an Officers' Certificate given pursuant
to Section 1004 shall be the principal executive, financial or accounting
officer of the Company.

         "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for, or an employee of, the Company, and who shall be reasonably
acceptable to the Trustee.

         "Original Issue Discount Security" means any Security which provides
for an amount less than the principal amount thereof to be due and payable upon
a declaration of acceleration of the Maturity thereof pursuant to Section 502.

         "Outstanding," when used with respect to Securities, means, as of the
date of determination, all Securities theretofore authenticated and delivered
under this Indenture, except:

         (1)     Securities theretofore canceled by the Trustee or delivered to
                 the Trustee for cancellation;

         (2)     Securities for whose payment or redemption money in the
necessary amount has been theretofore deposited with the Trustee or any Paying
Agent (other than the Company) in trust or set aside and segregated in trust by
the Company (if the Company shall act as its own Paying Agent) for the Holders
of such Securities; provided that, if such Securities are to be redeemed,
notice of such redemption has been duly given pursuant to this Indenture or
provision therefor satisfactory to the Trustee has been made;

         (3)     Securities as to which Defeasance has been effected pursuant
                 to Section 1302; and

         (4)     Securities which have been paid pursuant to Section 306 or in
exchange for or in lieu of which other Securities have been authenticated and
delivered pursuant to this Indenture, other than any such Securities in respect
of which there shall have been presented to the Trustee proof satisfactory to
it that such Securities are held by a bona fide purchaser in whose hands such
Securities are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given, made or taken any
request, demand, authorization, direction, notice, consent, waiver or other
action hereunder as of any date, (A) the principal amount of an Original Issue
Discount Security which shall be deemed to be Outstanding shall be the amount
of the principal thereof which would be due and payable as of such date upon
acceleration of the Maturity thereof to such date pursuant to Section 502, (B)
if, as of such date, the principal amount payable at the Stated Maturity of a
Security is not determinable, the principal amount of such Security which shall
be deemed to be Outstanding shall be the amount as specified or determined as
contemplated by Section 301, (C) the principal amount of a Security denominated
in one or more foreign currencies or currency units which shall be deemed to be
Outstanding shall be the U.S. dollar





                                         -5-
<PAGE>   15

equivalent, determined as of such date in the manner provided as contemplated
by Section 301, of the principal amount of such Security (or, in the case of a
Security described in Clause (A) or (B) above, of the amount determined as
provided in such Clause), and (D) Securities owned by the Company or any other
obligor upon the Securities or any Affiliate of the Company or of such other
obligor shall be disregarded and deemed not to be Outstanding, except that, in
determining whether the Trustee shall be protected in relying upon any such
request, demand, authorization, direction, notice, consent, waiver or other
action, only Securities which the Trustee knows to be so owned shall be so
disregarded.  Securities so owned which have been pledged in good faith may be
regarded as Outstanding if the pledgee establishes to the satisfaction of the
Trustee the pledgee's right so to act with respect to such Securities and that
the pledgee is not the Company or any other obligor upon the Securities or any
Affiliate of the Company or of such other obligor.

         "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

         "Payment Blockage Notice" has the meaning specified in Section 1504.

         "Person" means any individual, corporation, partnership, joint
venture, trust, unincorporated organization or government or any agency or
political subdivision thereof.

         "Place of Payment," when used with respect to the Securities of any
series, means the place or places where the principal of and any premium and
interest on the Securities of that series are payable as specified as
contemplated by Section 301.

         "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 306 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

         "Record Date" means any Regular Record Date or Special Record Date.

         "Redemption Date," when used with respect to any Security to be
redeemed, means the date fixed for such redemption by or pursuant to this
Indenture.

         "Redemption Price," when used with respect to any Security to be
redeemed, means the price at which it is to be redeemed pursuant to this
Indenture.

         "Regular Record Date" for the interest payable on any Interest Payment
Date on the Securities of any series means the date specified for that purpose
as contemplated by Section 301.

         "Representative" means the (a) indenture trustee or other trustee,
agent or representative for any Senior Debt or (b) with respect to any Senior
Debt that does not have any such trustee, agent or other representative, (i) in
the case of such Senior Debt issued pursuant to an agreement providing





                                         -6-
<PAGE>   16

for voting arrangements as among the holders or owners of such Senior Debt, any
holder or owner of such Senior Debt acting with the consent of the required
persons necessary to bind such holders or owners of such Senior Debt and (ii)
in the case of all other such Senior Debt, the holder or owner of such Senior
Debt.

         "Securities" has the meaning stated in the first recital of this
Indenture and more particularly means any Securities authenticated and
delivered under this Indenture.

         "Securities Act" means the Securities Act of 1933 and any statute
successor thereto, in each case as amended from time to time.

   "Security Register" and "Security Registrar" have the respective meanings
specified in Section 305.

         "Senior Debt" means the principal of (and premium, if any) and
interest, if any (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization relating to the Company to the
extent that such claim for post-petition interest is allowed in such
proceeding), on, rent with respect to, and all fees and other amounts payable
in connection with, the following, whether absolute or contingent, secured or
unsecured, due or to become due, outstanding on the date of this Indenture or
thereafter created, incurred or assumed: (a) indebtedness of the Company
evidenced by credit or loan agreement, note, bond, debenture or other written
obligation, (b) all obligations of the Company for money borrowed, (c) all
obligations of the Company evidenced by a note or similar instrument given in
connection with the acquisition of any businesses, properties or assets of any
kind, (d) obligations of the Company (i) as lessee under leases required to be
capitalized on the balance sheet of the lessee under generally accepted
accounting principles or (ii) under any lease or related document (including a
purchase agreement) that provides that the Company is contractually obligated
to purchase or cause a third party to purchase the leased property and the
obligations of the Company under such lease or related document to purchase or
to cause a third party to purchase such leased property, (e) all obligations of
the Company under interest rate and currency swaps, caps, floors, collars,
hedge agreements, forward contracts, or similar agreements or arrangements, (f)
all obligations of the Company with respect to letters of credit, bankers'
acceptances or similar facilities (including reimbursement obligations with
respect to any of the foregoing), (g) all obligations of the Company issued or
assumed as the deferred purchase price of property or services (but excluding
trade accounts payable arising in the ordinary course of business), (h) all
obligations of the type referred to in clauses (a) through (g) above of another
Person and all dividends of another Person, the payment of which, in either
case, the Company has assumed or guaranteed (or in effect guaranteed through an
agreement to purchase or otherwise (including, without limitation, "take or
pay" and similar arrangements)), or for which the Company is responsible or
liable, directly or indirectly, jointly or severally, as obligor, guarantor or
otherwise, or which is secured by lien on property of the Company, and all
obligations of the Company with respect thereto, and (i) renewals, extensions,
modifications, replacements, restatements and refundings of, or any
indebtedness or obligation issued in exchange for, any such indebtedness or
obligation described in clauses (a) through (h) of this paragraph; provided,
however, that Senior Debt shall not include the Securities or any such
indebtedness or obligation if the terms of such indebtedness or obligation (or





                                         -7-
<PAGE>   17

the terms of the instrument under which, or pursuant to which it is issued)
expressly provide that such indebtedness or obligation is not superior in right
of payment to the Securities.

         "Special Record Date" for the payment of any Defaulted Interest means
a date fixed by the Trustee pursuant to Section 307.

         "Stated Maturity," when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such instalment of principal or interest is due and payable.

         "Subsidiary" means any corporation of which at least a majority of the
outstanding voting stock of such corporation is at the time owned, directly or
indirectly, by the Company or by one or more other Subsidiaries, or by the
Company and one or more other Subsidiaries.  For the purposes of this
definition, "voting stock" means stock which ordinarily has voting power for
the election of directors, whether at all times or only so long as no senior
class of stock has such voting power by reason of any contingency.

         "Trust Indenture Act" means the Trust Indenture Act of 1939 as in
force at the date as of which this instrument was executed; provided, however,
that in the event the Trust Indenture Act of 1939 is amended after such date,
"Trust Indenture Act" means, to the extent required by any such amendment, the
Trust Indenture Act of 1939 as so amended.

         "Trustee" means the Person named as the "Trustee" in the first
paragraph of this instrument until a successor Trustee shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Trustee" shall mean or include each Person who is then a Trustee hereunder,
and if at any time there is more than one such Person, "Trustee" as used with
respect to the Securities of any series shall mean the Trustee with respect to
Securities of that series.

         "U.S. Government Obligation" has the meaning specified in Section
1304.

         "Vice President," when used with respect to the Company or the
Trustee, means any vice president, whether or not designated by a number or a
word or words added before or after the title "vice president."

SECTION 102.     COMPLIANCE CERTIFICATES AND OPINIONS.

         Upon any application or request by the Company to the Trustee to take
any action under any provision of this Indenture, the Company shall furnish to
the Trustee such certificates and opinions as may be required under the Trust
Indenture Act.  Each such certificate or opinion shall be given in the form of
an Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of Counsel, if to be given by counsel, and shall comply with the
requirements of the Trust Indenture Act and any other requirements set forth in
this Indenture.



                                         -8-
<PAGE>   18

         Every certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture shall include,

         (1)     a statement that each individual signing such certificate or
opinion has read such covenant or condition and the definitions herein relating
thereto;

         (2)     a brief statement as to the nature and scope of the
examination or investigation upon which the statements or opinions contained in
such certificate or opinion are based;

         (3)     a statement that, in the opinion of each such individual, he
or she has made such examination or investigation as is necessary to enable him
or her to express an informed opinion as to whether or not such covenant or
condition has been complied with; and

         (4)     a statement as to whether, in the opinion of each such
individual, such condition or covenant has been complied with.

SECTION 103.     FORM OF DOCUMENTS DELIVERED TO TRUSTEE.

         In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

         Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his or her certificate or opinion is
based are erroneous.  Any such certificate or opinion of counsel may be based,
insofar as it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

         Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

SECTION 104.     ACTS OF HOLDERS; RECORD DATES.

         Any request, demand, authorization, direction, notice, consent, waiver
or other action provided or permitted by this Indenture to be given, made or
taken by Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person





                                         -9-
<PAGE>   19

or by agent duly appointed in writing; and, except as herein otherwise
expressly provided, such action shall become effective when such instrument or
instruments are delivered to the Trustee and, where it is hereby expressly
required, to the Company.  The Trustee shall promptly deliver to the Company
copies of all such instrument or instruments delivered to the Trustee.  Such
instrument or instruments (and the action embodied therein and evidenced
thereby) are herein sometimes referred to as the "Act" of the Holders signing
such instrument or instruments.  Proof of execution of any such instrument or
of a writing appointing any such agent shall be sufficient for any purpose of
this Indenture and (subject to Section 601) conclusive in favor of the Trustee
and the Company, if made in the manner provided in this Section.

         The fact and date of the execution by any Person of any such
instrument or writing may be proved by the affidavit of a witness of such
execution or by a certificate of a notary public or other officer authorized by
law to take acknowledgments of deeds, certifying that the individual signing
such instrument or writing acknowledged to him or her the execution thereof.
Where such execution is by a signer acting in a capacity other than his or her
individual capacity, such certificate or affidavit shall also constitute
sufficient proof of his or her authority.  The fact and date of the execution
of any such instrument or writing, or the authority of the Person executing the
same, may also be proved in any other manner which the Trustee deems
sufficient.

         The ownership of Securities shall be proved by the Security Register.

         Any request, demand, authorization, direction, notice, consent, waiver
or other Act of the Holder of any Security shall bind every future Holder of
the same Security and the Holder of every Security issued upon the registration
of transfer thereof or in exchange therefor or in lieu thereof in respect of
anything done, omitted or suffered to be done by the Trustee or the Company in
reliance thereon, whether or not notation of such action is made upon such
Security.

         The Company may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
give, make or take any request, demand, authorization, direction, vote, notice,
consent, waiver or other action provided or permitted by this Indenture to be
given, made or taken by Holders of Securities of such series, provided that the
Company may not set a record date for, and the provisions of this paragraph
shall not apply with respect to, the giving or making of any notice,
declaration, request or direction referred to in the next paragraph.  If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of the relevant series on such record date, and no other Holders,
shall be entitled to take the relevant action, whether or not such Holders
remain Holders after such record date; provided that no such action shall be
effective hereunder unless taken on or prior to the applicable Expiration Date
by Holders of the requisite principal amount of Outstanding Securities of such
series on such record date.  Nothing in this paragraph shall be construed to
prevent the Company from setting a new record date for any action for which a
record date has previously been set pursuant to this paragraph (whereupon the
record date previously set shall automatically and with no action by any Person
be canceled and of no effect), and nothing in this paragraph shall be construed
to render ineffective any action taken by Holders of the requisite principal
amount of Outstanding Securities of the relevant series on the date such action
is taken.  Promptly after any record date is set pursuant to this





                                        -10-
<PAGE>   20

paragraph, the Company, at its own expense, shall cause notice of such record
date, the proposed action by Holders and the applicable Expiration Date to be
given to the Trustee in writing and to each Holder of Securities of the
relevant series in the manner set forth in Section 106.

         The Trustee may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
join in the giving or making of (i) any Notice of Default, (ii) any declaration
of acceleration referred to in Section 502, (iii) any request to institute
proceedings referred to in Section 507(2) or (iv) any direction referred to in
Section 512, in each case with respect to Securities of such series.  If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of such series on such record date, and no other Holders, shall be
entitled to join in such notice, declaration, request or direction, whether or
not such Holders remain Holders after such record date; provided that no such
action shall be effective hereunder unless taken on or prior to the applicable
Expiration Date by Holders of the requisite principal amount of Outstanding
Securities of such series on such record date.  Nothing in this paragraph shall
be construed to prevent the Trustee from setting a new record date for any
action for which a record date has previously been set pursuant to this
paragraph (whereupon the record date previously set shall automatically and
with no action by any Person be canceled and of no effect), and nothing in this
paragraph shall be construed to render ineffective any action taken by Holders
of the requisite principal amount of Outstanding Securities of the relevant
series on the date such action is taken.  Promptly after any record date is set
pursuant to this paragraph, the Trustee, at the Company's expense, shall cause
notice of such record date, the proposed action by Holders and the applicable
Expiration Date to be given to the Company in writing and to each Holder of
Securities of the relevant series in the manner set forth in Section 106.

         With respect to any record date set pursuant to this Section, the
party hereto which sets such record dates may designate any day as the
"Expiration Date" and from time to time may change the Expiration Date to any
earlier or later day; provided that no such change shall be effective unless
notice of the proposed new Expiration Date is given to the other party hereto
in writing, and to each Holder of Securities of the relevant series in the
manner set forth in Section 106, on or prior to the existing Expiration Date.
If an Expiration Date is not designated with respect to any record date set
pursuant to this Section, the party hereto which set such record date shall be
deemed to have initially designated the 180th day after such record date as the
Expiration Date with respect thereto, subject to its right to change the
Expiration Date as provided in this paragraph.  Notwithstanding the foregoing,
no Expiration Date shall be later than the 180th day after the applicable
record date.

         Without limiting the foregoing, a Holder entitled hereunder to take
any action hereunder with regard to any particular Security may do so with
regard to all or any part of the principal amount of such Security or by one or
more duly appointed agents each of which may do so pursuant to such appointment
with regard to all or any part of such principal amount.

SECTION 105.     NOTICES, ETC., TO TRUSTEE AND COMPANY.





                                        -11-

<PAGE>   21

         Any request, demand, authorization, direction, notice, consent, waiver
or Act of Holders or other document provided or permitted by this Indenture to
be made upon, given or furnished to, or filed with,

         (1)     the Trustee by any Holder or by the Company shall be
sufficient for every purpose hereunder if made, given, furnished or filed in
writing (or by facsimile transmissions ((312) 904-2236), provided that oral
confirmation of receipt shall have been received) to or with the Trustee at its
Corporate Trust Office, Attention: Corporate Trust Department, or

         (2)     the Company by the Trustee or by any Holder shall be
sufficient for every purpose hereunder (unless otherwise herein expressly
provided) if in writing and mailed, first-class postage prepaid, to the Company
addressed to it at the address of its principal office specified in the first
paragraph of this instrument or at any other address previously furnished in
writing to the Trustee by the Company, Attention: Chief Financial Officer.

SECTION 106.     NOTICE TO HOLDERS; WAIVER.

         Where this Indenture provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first-class postage prepaid, to each Holder affected
by such event, at its address as it appears in the Security Register, not later
than the latest date (if any), and not earlier than the earliest date (if any),
prescribed for the giving of such notice.  In any case where notice to Holders
is given by mail, neither the failure to mail such notice, nor any defect in
any notice so mailed, to any particular Holder shall affect the sufficiency of
such notice with respect to other Holders.  Where this Indenture provides for
notice in any manner, such notice may be waived in writing by the Person
entitled to receive such notice, either before or after the event, and such
waiver shall be the equivalent of such notice.  Waivers of notice by Holders
shall be filed with the Trustee, but such filing shall not be a condition
precedent to the validity of any action taken in reliance upon such waiver.

         In case by reason of the suspension of regular mail service or by
reason of any other cause it shall be impracticable to give such notice by
mail, then such notification as shall be made with the approval of the Trustee
shall constitute a sufficient notification for every purpose hereunder.

SECTION 107.     CONFLICT WITH TRUST INDENTURE ACT.

         If any provision hereof limits, qualifies or conflicts with a
provision of the Trust Indenture Act which is required under such Act to be a
part of and govern this Indenture, the latter provision shall control.  If any
provision of this Indenture modifies or excludes any provision of the Trust
Indenture Act which may be so modified or excluded, the latter provision shall
be deemed to apply to this Indenture as so modified or to be excluded, as the
case may be.

SECTION 108.     EFFECT OF HEADINGS AND TABLE OF CONTENTS.





                                        -12-
<PAGE>   22

         The Article and Section headings herein and the Table of Contents are
for convenience only and shall not affect the construction hereof.

SECTION 109.     SUCCESSORS AND ASSIGNS.

         All covenants and agreements in this Indenture by the Company shall
bind its successors and assigns, whether so expressed or not.

SECTION 110.     SEPARABILITY CLAUSE.

         In case any provision in this Indenture or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

SECTION 111.     BENEFITS OF INDENTURE.

         Nothing in this Indenture or in the Securities, express or implied,
shall give to any Person, other than the parties hereto and their successors
hereunder, the holders of Senior Debt and the Holders, any benefit or any legal
or equitable right, remedy or claim under this Indenture.

SECTION 112.     GOVERNING LAW.

         THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

SECTION 113.     LEGAL HOLIDAYS.

         In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security or the last date on which a Holder has the right to
convert a Security at a particular conversion price shall not be a Business Day
at any Place of Payment, then (notwithstanding any other provision of this
Indenture or of the Securities (other than a provision of any Security which
specifically states that such provision shall apply in lieu of this Section))
payment of interest or principal (and premium, if any) or, if applicable to a
particular series of Securities, conversion need not be made at such Place of
Payment on such date, but may be made on the next succeeding Business Day at
such Place of Payment with the same force and effect as if made on the Interest
Payment Date or Redemption Date, at the Stated Maturity or on such last day for
conversion, as the case may be.

SECTION 114.     INDENTURE AND SECURITIES SOLELY CORPORATE OBLIGATIONS.

         No recourse for the payment of the principal of or premium, if any, or
interest on any Security, or for any claim based thereon or otherwise in
respect thereof, and no recourse under or upon any obligation, covenant or
agreement of the Company in this Indenture or in any supplemental indenture or
in any Security, or because of the creation of any indebtedness represented
thereby, shall





                                        -13-
<PAGE>   23

be had against any incorporator, stockholder, employee, agent, officer, or
director or subsidiary, as such, past, present or future, of the Company or of
any successor corporation, either directly or through the Company or any
successor corporation, whether by virtue of any constitution, statute or rule
of law, or by the enforcement of any assessment or penalty or otherwise; it
being expressly understood that all such liability is hereby expressly waived
and released as a condition of, and as a consideration for, the execution of
this Indenture and the issue of the Securities.

SECTION 115.     INDENTURE MAY BE EXECUTED IN COUNTERPARTS.

         This instrument may be executed in any number of counterparts, each of
which shall be an original, but such counterparts shall together constitute but
one and the same instruments.

                                  ARTICLE TWO

                                 SECURITY FORMS

SECTION 201.     FORMS GENERALLY.

         The Securities of each series shall be in substantially the form set
forth in this Article, or in such other form as shall be established by or
pursuant to a Board Resolution or in one or more indentures supplemental
hereto, in each case with such appropriate insertions, omissions, substitutions
and other variations as are required or permitted by this Indenture, and may
have such letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or Depositary therefor or as may, consistently herewith, be
determined by the officers executing such Securities, as evidenced by their
execution thereof.  If the form of Securities of any series is established by
action taken pursuant to a Board Resolution, a copy of an appropriate record of
such action shall be certified by the Secretary or an Assistant Secretary of
the Company and delivered to the Trustee at or prior to the delivery of the
Company Order contemplated by Section 303 for the authentication and delivery
of such Securities.  Any such Board Resolution or record of such action shall
have attached thereto a true and correct copy of the form of Security referred
to therein approved by or pursuant to such Board Resolution.

         The definitive Securities shall be printed, lithographed or engraved
on steel engraved borders or may be produced in any other manner, all as
determined by the officers executing such Securities, as evidenced by their
execution of such Securities.

SECTION 202.     FORM OF FACE OF SECURITY.

 [INSERT ANY LEGEND REQUIRED BY THE INTERNAL REVENUE CODE AND THE REGULATIONS
                                 THEREUNDER.]

                           WESTELL TECHNOLOGIES, INC.

              ____________________________________________________





                                        -14-
<PAGE>   24


No. _________                                                     $_____________

         Westell Technologies, Inc., a corporation duly organized and existing
under the laws of Delaware (herein called the "Company," which term includes
any successor Person under the Indenture hereinafter referred to), for value
received, hereby promises to pay to ________________________, or registered
assigns, the principal sum of ____________________ Dollars on ________________
[IF THE SECURITY IS TO BEAR INTEREST PRIOR TO MATURITY, INSERT -- , and to pay
interest thereon from _________ or from the most recent Interest Payment Date
to which interest has been paid or duly provided for, semi-annually on
_________ and _________ in each year, commencing _________, at the rate of ___%
per annum, until the principal hereof is paid or made available for payment [IF
APPLICABLE, INSERT -- , provided that any principal and premium, and any such
instalment of interest, which is overdue shall bear interest at the rate of
___% per annum (to the extent that the payment of such interest shall be
legally enforceable), from the dates such amounts are due until they are paid
or made available for payment, and such interest shall be payable on demand].
The interest so payable, and punctually paid or duly provided for, on any
Interest Payment Date will, as provided in such Indenture, be paid to the
Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date for such
interest, which shall be the ______ or _______ (whether or not a Business Day),
as the case may be, next preceding such Interest Payment Date.  Any such
interest not so punctually paid or duly provided for will forthwith cease to be
payable to the Holder on such Regular Record Date and may either be paid to the
Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on a Special Record Date for the payment of
such Defaulted Interest to be fixed by the Trustee, notice whereof shall be
given to Holders of Securities of this series not less than 10 days prior to
such Special Record Date, or be paid at any time in any other lawful manner not
inconsistent with the requirements of any securities exchange on which the
Securities of this series may be listed, and upon such notice as may be
required by such exchange, all as more fully provided in said Indenture].

         [IF THE SECURITY IS NOT TO BEAR INTEREST PRIOR TO MATURITY, INSERT --
The principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal and any overdue premium shall
bear interest at the rate of ___% per annum (to the extent that the payment of
such interest shall be legally enforceable), from the dates such amounts are
due until they are paid or made available for payment.  Interest on any overdue
principal or premium shall be payable on demand.  Any such interest on overdue
principal or premium which is not paid on demand shall bear interest at the
rate of ___% per annum (to the extent that the payment of such interest on
interest shall be legally enforceable), from the date of such demand until the
amount so demanded is paid or made available for payment.  Interest on any
overdue interest shall be payable on demand.]

         Payment of the principal of (and premium, if any) and [IF APPLICABLE,
INSERT -- any such] interest on this Security will be made at the office or
agency of the Company maintained for that purpose in _________, in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts [IF APPLICABLE, INSERT -- ;
provided,





                                        -15-
<PAGE>   25

however, that at the option of the Company payment of interest may be made by
check mailed to the address of the Person entitled thereto as such address
shall appear in the Security Register].

         Reference is hereby made to the further provisions of this Security
set forth on the reverse hereof, which further provisions shall for all
purposes have the same effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Trustee referred to on the reverse hereof by manual signature, this
Security shall not be entitled to any benefit under the Indenture or be valid
or obligatory for any purpose.

         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

Dated:                                  WESTELL TECHNOLOGIES, INC.


                                        By:___________________________________
                                           Title:
                                             
Attest:

___________________________________________

SECTION 203.     FORM OF REVERSE OF SECURITY.

         This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or
more series under an Indenture, dated as of _______________, 1997 (herein
called the "Indenture," which term shall have the meaning assigned to it in
such instrument), between the Company and LaSalle National Bank, as Trustee
(herein called the "Trustee," which term includes any successor trustee under
the Indenture), and reference is hereby made to the Indenture and all
indentures supplemental thereto for a statement of the respective rights,
limitations of rights, duties and immunities thereunder of the Company, the
Trustee, the holders of Senior Debt and the Holders of the Securities and of
the terms upon which the Securities are, and are to be, authenticated and
delivered.  This Security is one of the series designated on the face hereof
[IF APPLICABLE, INSERT -- , limited in aggregate principal amount to
$_________].

         [IF APPLICABLE, INSERT -- The Securities of this series are subject to
redemption upon not less than [IF APPLICABLE, INSERT -- 30] days' notice by
mail, [IF APPLICABLE, INSERT -- (1) on _________ in any year commencing with
the year _____ and ending with the year _____ through operation of the sinking
fund for this series at a Redemption Price equal to 100% of the principal
amount, and (2)] at any time [IF APPLICABLE, INSERT -- on or after _________,
19__], as a whole or in part, at the election of the Company, at the following
Redemption Prices (expressed as percentages of the principal amount):  If
redeemed [IF APPLICABLE, INSERT -- on or before _________, ___%, and if
redeemed] during the 12-month period beginning ________ of the years indicated,
and thereafter at





                                        -16-
<PAGE>   26

a Redemption Price equal to .....% of the principal amount, together in the
case of any such redemption [IF APPLICABLE, INSERT -- (whether through
operation of the sinking fund or otherwise)] with accrued interest to the
Redemption Date, but interest installments whose Stated Maturity is on or prior
to such Redemption Date will be payable to the Holders of such Securities, or
one or more Predecessor Securities, of record at the close of business on the
relevant Record Dates referred to on the face hereof, all as provided in the
Indenture.]

<TABLE>
<CAPTION>
                                            Redemption                                                 Redemption
                            Year              Price                                    Year               Price
                            --------------------------                                 --------------------------       
<S>                        <C>                <C>                                       <C>              <C>
</TABLE>


         [IF APPLICABLE, INSERT -- The Securities of this series are subject to
redemption upon not less than [IF APPLICABLE, INSERT -- 30] days' notice by
mail, (1) on _________ in any year commencing with the year _____ and ending
with the year _____ through operation of the sinking fund for this series at
the Redemption Prices for redemption through operation of the sinking fund
(expressed as percentages of the principal amount) set forth in the table
below, and (2) at any time [IF APPLICABLE, INSERT -- on or after __________],
as a whole or in part, at the election of the Company, at the Redemption Prices
for redemption otherwise than through operation of the sinking fund (expressed
as percentages of the principal amount) set forth in the table below: If
redeemed during the 12-month period beginning ________ of the years indicated,

<TABLE>
<CAPTION>

                                                 Redemption Price For                       Redemption Price For
                                                  Redemption Through                        Redemption Otherwise
                                                   Operation of the                        Than Through Operation
                            Year                     Sinking Fund                           of the Sinking Fund
                            ----                     ------------                           -------------------
<S>                         <C>                         <C>                                     <C>
</TABLE>




and thereafter at a Redemption Price equal to ___% of the principal amount,
together in the case of any such redemption (whether through operation of the
sinking fund or otherwise) with accrued interest to the Redemption Date, but
interest installments whose Stated Maturity is on or prior to such Redemption
Date will be payable to the Holders of such Securities, or one or more
Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture.]

         [IF APPLICABLE, INSERT -- Notwithstanding the foregoing, the Company
may not, prior to __________, redeem any Securities of this series as
contemplated by [IF APPLICABLE, INSERT -- Clause (2) of] the preceding
paragraph as a part of, or in anticipation of, any refunding operation by the
application, directly or indirectly, of moneys borrowed having an interest cost
to the Company (calculated in accordance with generally accepted financial
practice) of less than ___% per annum.]





                                        -17-
<PAGE>   27

         [IF APPLICABLE, INSERT -- The sinking fund for this series provides
for the redemption on _________, in each year beginning with the year _____ and
ending with the year _____ of [IF APPLICABLE, INSERT -- not less than $_______
("mandatory sinking fund") and not more than] $_______ aggregate principal
amount of Securities of this series.  Securities of this series acquired or
redeemed by the Company otherwise than through [IF APPLICABLE, INSERT --
mandatory] sinking fund payments may be credited against subsequent [if
applicable, insert -- mandatory] sinking fund payments otherwise required to be
made [IF APPLICABLE, INSERT -- , in the inverse order in which they become
due].]

         [IF THE SECURITY IS SUBJECT TO REDEMPTION OF ANY KIND, INSERT -- In
the event of redemption of this Security in part only, a new Security or
Securities of this series and of like tenor for the unredeemed portion hereof
will be issued in the name of the Holder hereof upon the cancellation hereof.]

         [IF APPLICABLE, INSERT -- The Indenture contains provisions for
defeasance at any time of [the entire indebtedness of this Security] [or]
[certain restrictive covenants and Events of Default with respect to this
Security] [, in each case] upon compliance with certain conditions set forth in
the Indenture.]

         [IF THE SECURITY IS CONVERTIBLE INTO COMMON STOCK OF THE COMPANY,
INSERT -- Subject to the provisions of the Indenture, the Holder of this
Security is entitled, at its option, at any time on or before [insert date]
(except that, in case this Security or any portion hereof shall be called for
redemption, such right shall terminate with respect to this Security or portion
hereof, as the case may be, so called for redemption at the close of business
on the first Business Day next preceding the date fixed for redemption as
provided in the Indenture unless the Company defaults in making the payment due
upon redemption), to convert the principal amount of this Security (or any
portion hereof which is $1,000 or an integral multiple thereof), into fully
paid and non-assessable shares (calculated as to each conversion to the nearest
1/100th of a share) of the Common Stock of the Company, as said shares shall be
constituted at the date of conversion, at the conversion price of $______
principal amount of Securities for each share of Common Stock, or at the
adjusted conversion price in effect at the date of conversion determined as
provided in the Indenture, upon surrender of this Security, together with the
conversion notice hereon duly executed, to the Company at the designated office
or agency of the Company in ____________, accompanied (if so required by the
Company) by instruments of transfer, in form satisfactory to the Company and to
the Trustee, duly executed by the Holder or by its duly authorized attorney in
writing.  Such surrender shall, if made during any period beginning at the
close of business on a Regular Record Date and ending at the opening of
business on the Interest Payment Date next following such Regular Record Date
(unless this Security or the portion being converted shall have been called for
redemption on a Redemption Date during the period beginning at the close of
business on a Regular Record Date and ending at the opening of business on the
first Business Day after the next succeeding Interest Payment Date, or if such
Interest Payment Date is not a Business Day, the second such Business Day),
also be accompanied by payment in funds acceptable to the Company of an amount
equal to the interest payable on such Interest Payment Date on the principal
amount of this Security then being converted.  Subject to the aforesaid
requirement for payment and, in the case of a conversion





                                        -18-
<PAGE>   28

after the Regular Record Date next preceding any Interest Payment Date and on
or before such Interest Payment Date, to the right of the Holder of this
Security (or any Predecessor Security) of record at such Regular Record Date to
receive an installment of interest (with certain exceptions provided in the
Indenture), no adjustment is to be made on conversion for interest accrued
hereon or for dividends on shares of Common Stock issued on conversion.  The
Company is not required to issue fractional shares upon any such conversion,
but shall make adjustment therefor in cash on the basis of the current market
value of such fractional interest as provided in the Indenture.  The conversion
price is subject to adjustment as provided in the Indenture.  In addition, the
Indenture provides that in case of certain consolidations or mergers to which
the Company is a party or the sale of substantially all of the assets of the
Company, the Indenture shall be amended, without the consent of any Holders of
Securities, so that this Security, if then outstanding, will be convertible
thereafter, during the period this Security shall be convertible as specified
above, only into the kind and amount of securities, cash and other property
receivable upon the consolidation, merger or sale by a holder of the number of
shares of Common Stock into which this Security might have been converted
immediately prior to such consolidation, merger or sale (assuming such holder
of Common Stock failed to exercise any rights of election and received per
share the kind and amount received per share by a plurality of non-electing
shares).  In the event of conversion of this Security in part only, a new
Security or Securities for the unconverted portion hereof shall be issued in
the name of the Holder hereof upon the cancellation hereof.]

         [IF THE SECURITY IS CONVERTIBLE INTO OTHER SECURITIES OF THE COMPANY, 
SPECIFY THE CONVERSION FEATURES.]

         The indebtedness evidenced by this Security is, to the extent and in
the manner provided in the Indenture, subordinate and subject in right of
payment to the prior payment in full of all Senior Indebtedness of the Company,
and this Security is issued subject to such provisions of the Indenture with
respect thereto.  Each Holder of this Security, by accepting the same (a)
agrees to and shall be bound by such provisions, (b) authorizes and directs the
Trustee on his behalf to take such action as may be necessary to appropriate to
effectuate the subordination so provided and (c) appoints the Trustee his
attorney-in-fact for any and all such purposes.

         [IF THE SECURITY IS NOT AN ORIGINAL ISSUE DISCOUNT SECURITY, INSERT --
If an Event of Default with respect to Securities of this series shall occur
and be continuing, the principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.]

         [IF THE SECURITY IS AN ORIGINAL ISSUE DISCOUNT SECURITY, INSERT -- If
an Event of Default with respect to Securities of this series shall occur and
be continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.  Such amount shall be equal to --INSERT FORMULA FOR DETERMINING THE
AMOUNT.  Upon payment (i) of the amount of principal so declared due and
payable and (ii) of interest on any overdue principal, premium and interest (in
each case to the extent that the payment of such interest shall be legally
enforceable), all of the Company's obligations in respect of the payment of the
principal of and premium and interest, if any, on the Securities of this series
shall terminate.]





                                        -19-
<PAGE>   29


         The Indenture permits, with certain exceptions as therein provided,
the amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with
the consent of the Holders of more than 50% in principal amount of the
Securities at the time Outstanding of each series to be affected.  The
Indenture also contains provisions permitting the Holders of specified
percentages in principal amount of the Securities of each series at the time
Outstanding, on behalf of the Holders of all Securities of such series, to
waive compliance by the Company with certain provisions of the Indenture and
certain past defaults under the Indenture and their consequences.  Any such
consent or waiver by the Holder of this Security shall be conclusive and
binding upon such Holder and upon all future Holders of this Security and of
any Security issued upon the registration of transfer hereof or in exchange
herefor or in lieu hereof, whether or not notation of such consent or waiver is
made upon this Security.

         As provided in and subject to the provisions of the Indenture, the
Holder of this Security shall not have the right to institute any proceeding
with respect to the Indenture or for the appointment of a receiver or trustee
or for any other remedy thereunder, unless such Holder shall have previously
given the Trustee written notice of a continuing Event of Default with respect
to the Securities of this series, the Holders of not less than 25% in principal
amount of the Securities of this series at the time Outstanding shall have made
written request to the Trustee to institute proceedings in respect of such
Event of Default as Trustee and offered the Trustee reasonable indemnity, and
the Trustee shall not have received from the Holders of a majority in principal
amount of Securities of this series at the time Outstanding a direction
inconsistent with such request, and shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity.  The foregoing shall not apply to any suit instituted by the Holder
of this Security for the enforcement of any payment of principal hereof or any
premium or interest hereon on or after the respective due dates expressed
herein.

         No reference herein to the Indenture and no provision of this Security
or of the Indenture shall alter or impair the obligation of the Company, which
is absolute and unconditional, to pay the principal of and any premium and
interest on this Security at the times, place and rate, and in the coin or
currency, herein prescribed.

         As provided in the Indenture and subject to certain limitations
therein set forth, the transfer of this Security is registrable in the Security
Register, upon surrender of this Security for registration of transfer at the
office or agency of the Company in any place where the principal of and any
premium and interest on this Security are payable, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Security Registrar duly executed by, the Holder hereof or its
attorney duly authorized in writing, and thereupon one or more new Securities
of this series and of like tenor, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees.

         The Securities of this series are issuable only in registered form
without coupons in denominations of $_____ and any integral multiple thereof.
As provided in the Indenture and subject to certain limitations therein set
forth, Securities of this series are exchangeable for a like aggregate





                                        -20-
<PAGE>   30

principal amount of Securities of this series and of like tenor of a different
authorized denomination, as requested by the Holder surrendering the same.

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.

         Prior to due presentment of this Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name this Security is registered as the owner
hereof for all purposes, whether or not this Security be overdue, and neither
the Company, the Trustee nor any such agent shall be affected by notice to the
contrary.

         All terms used in this Security which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

SECTION 204.     FORM OF LEGEND FOR GLOBAL SECURITIES.

         Unless otherwise specified as contemplated by Section 301 for the
Securities evidenced thereby, every Global Security authenticated and delivered
hereunder shall bear a legend in substantially the following form:

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF.  THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A
SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY
BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A
NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE
INDENTURE.

SECTION 205.     FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION.

         The Trustee's certificates of authentication shall be in substantially
the following form:

         This is one of the Securities of the series designated herein referred
to in the within-mentioned Indenture.


                                  LASALLE NATIONAL BANK,
                                  As Trustee


                                  By:
                                     ----------------------------------------
                                     Authorized Officer





                                        -21-
<PAGE>   31

SECTION 206.     FORM OF CONVERSION NOTICE.

         Conversion notices shall be in substantially the following form:

         To Westell Technologies, Inc.:

         The undersigned owner of this Security hereby irrevocably exercises
the option to convert this Security, or portion hereof (which is $1,000 or an
integral multiple thereof) below designated, into shares of Common Stock of the
Company in accordance with the terms of the Indenture referred to in this
Security, and directs that the shares issuable and deliverable upon the
conversion, together with any check in payment for fractional shares and any
Securities representing any unconverted principal amount hereof, be issued and
delivered to the registered holder hereof unless a different name has been
indicated below.  If this Notice is being delivered on a date after the close
of business on a Regular Record Date and prior to the opening of business on
the related Interest Payment Date (unless this Security or the portion thereof
being converted has been called for redemption on a Redemption Date during the
period beginning at the close of business on a Regular Record Date and ending
at the opening of business on the first Business Day after the next succeeding
Interest Payment Date, or if such Interest Payment Date is not a Business Day,
the second such Business Day), this Notice is accompanied by payment, in funds
acceptable to the Company, of an amount equal to the interest payable on such
Interest Payment Date of the principal of this Security to be converted.  If
shares are to be issued in the name of a person other than the undersigned, the
undersigned will pay all transfer taxes payable with respect hereto.  Any
amount required to be paid by the undersigned on account of interest
accompanies this Security.

        Principal Amount to be Converted
(in an integral multiple of $1,000, 
         if less than all)
                U.S. $ _________

Dated: ___________________


                                        ________________________________________
                                        ________________________________________
                                        Signature(s) must be guaranteed by a
                                        commercial bank or trust company or a 
                                        member firm of a national stock 
                                        exchange if shares of Common Stock are 
                                        to be delivered, or Securities to be 
                                        issued, other than to and in the name 
                                        of the registered owner.

                                        ________________________________________
                                        Signature Guaranty

         Fill in for registration of shares of Common Stock and Security if to
be issued otherwise than to the registered Holder.

_________________________________       _______________________________________
(Name)                                  Social Security or Other Taxpayer
                                        Identification Number





                                        -22-
<PAGE>   32

- --------------------------------------
(Address)

- --------------------------------------
Please print Name and Address
(including zip code number)

[The above conversion notice is to be modified, as appropriate, for conversion
into other securities or property of the Company.]

                                 ARTICLE THREE

                                 THE SECURITIES

SECTION 301.     AMOUNT UNLIMITED; ISSUABLE IN SERIES.

         The aggregate principal amount of Securities which may be
authenticated and delivered under this Indenture is unlimited.

         The Securities may be issued in one or more series.  There shall be
established in or pursuant to a Board Resolution and, subject to Section 303,
set forth, or determined in the manner provided, in an Officers' Certificate,
or established in one or more indentures supplemental hereto, prior to the
issuance of Securities of any series,

         (1)     the title of the Securities of the series (which shall
distinguish the Securities of the series from Securities of any other series);

         (2)     any limit upon the aggregate principal amount of the
Securities of the series which may be authenticated and delivered under this
Indenture (except for Securities authenticated and delivered upon registration
of transfer of, or in exchange for, or in lieu of, other Securities of the
series pursuant to Section 304, 305, 306, 906 or 1107 and except for any
Securities which, pursuant to Section 303, are deemed never to have been
authenticated and delivered hereunder);

         (3)     the Person to whom any interest on a Security of the series
shall be payable, if other than the Person in whose name that Security (or one
or more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest;

         (4)     the date or dates on which the principal of any Securities of
the series is payable;

         (5)     the rate or rates at which any Securities of the series shall
bear interest, if any, the date or dates from which any such interest shall
accrue, the Interest Payment Dates on which any such interest shall be payable
and the Regular Record Date for any such interest payable on any Interest
Payment Date;

         (6)     the place or places where the principal of and any premium and
interest on any Securities of the series shall be payable;





                                        -23-
<PAGE>   33


         (7)     the period or periods within which, the price or prices at
which and the terms and conditions upon which any Securities of the series may
be redeemed, in whole or in part, at the option of the Company and, if other
than by a Board Resolution, the manner in which any election by the Company to
redeem the Securities shall be evidenced;

         (8)     the obligation, if any, of the Company to redeem or purchase
any Securities of the series pursuant to any sinking fund or analogous
provisions or at the option of the Holder thereof and the period or periods
within which, the price or prices at which and the terms and conditions upon
which any Securities of the series shall be redeemed or purchased, in whole or
in part, pursuant to such obligation;

         (9)     if other than denominations of $1,000 and any integral
multiple thereof, the denominations in which any Securities of the series shall
be issuable;

         (10)    if the amount of principal of or any premium or interest on
any Securities of the series may be determined with reference to an index or
pursuant to a formula, the manner in which such amounts shall be determined;

         (11)    if other than the currency of the United States of America,
the currency, currencies or currency units in which the principal of or any
premium or interest on any Securities of the series shall be payable (and the
manner of determining the equivalent thereof in the currency of the United
States of America for any purpose, including for purposes of the definition of
"Outstanding" in Section 101);

         (12)    if the principal of or any premium or interest on any
Securities of the series is to be payable, at the election of the Company or
the Holder thereof, in one or more currencies or currency units other than
those in which such Securities are stated to be payable, the currency,
currencies or currency units in which the principal of or any premium or
interest on such Securities as to which such election is made shall be payable,
the periods within which and the terms and conditions upon which such election
is to be made and the amount so payable (or the manner in which such amount
shall be determined);

         (13)    if other than the entire principal amount thereof, the portion
of the principal amount of any Securities of the series which shall be payable
upon declaration of acceleration of the Maturity thereof pursuant to Section
502;

         (14)    if the principal amount payable at the Stated Maturity of any
Securities of the series will not be determinable as of any one or more dates
prior to the Stated Maturity, the amount which shall be deemed to be the
principal amount of such Securities as of any such date for any purpose,
including the principal amount thereof which shall be due and payable upon any
Maturity other than the Stated Maturity or which shall be deemed to be
Outstanding as of any date prior to the Stated Maturity (or, in any such case,
the manner in which such amount deemed to be the principal amount shall be
determined);





                                        -24-
<PAGE>   34

         (15)    if applicable, that the Securities of the series, in whole or
any specified part, shall be defeasible pursuant to Section 1302 or Section
1303 or both such Sections and, if other than by a Board Resolution, the manner
in which any election by the Company to defease such Securities shall be
evidenced;

         (16)    if applicable, the terms of any right to convert Securities of
the series into shares of Common Stock of the Company or other securities or
property;

         (17)    if applicable, that any Securities of the series shall be
issuable in whole or in part in the form of one or more Global Securities and,
in such case, the respective Depositaries for such Global Securities, the form
of any legend or legends which shall be borne by any such Global Security in
addition to or in lieu of that set forth in Section 204 and any circumstances
in addition to or in lieu of those set forth in Clause (2) of the last
paragraph of Section 305 in which any such Global Security may be exchanged in
whole or in part for Securities registered, and any transfer of such Global
Security in whole or in part may be registered, in the name or names of Persons
other than the Depositary for such Global Security or a nominee thereof;

         (18)    the nonapplicability of, or any addition to or change in, the
Events of Default which applies to any Securities of the series and any change
in the right of the Trustee or the requisite Holders of such Securities to
declare the principal amount thereof due and payable pursuant to Section 502;

         (19)    any addition to or change in the covenants set forth in
Article Ten which applies to Securities of the series; and

         (20)    any other terms of the series (which terms shall not be
inconsistent with the provisions of this Indenture, except as permitted by
Section 901(5)).

         All Securities of any one series shall be substantially identical
except as to denomination and except as may otherwise be provided in or
pursuant to the Board Resolution referred to above and (subject to Section 303)
set forth, or determined in the manner provided, in the Officers' Certificate
referred to above or in any such indenture supplemental hereto.

         If any of the terms of the series are established by action taken
pursuant to a Board Resolution, a copy of an appropriate record of such action
shall be certified by the Secretary or an Assistant Secretary of the Company
and delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

         The Securities shall be subordinated in right of payment to Senior 
Debt as provided in Article Fifteen.

SECTION 302.     DENOMINATIONS.





                                        -25-
<PAGE>   35

         The Securities of each series shall be issuable only in registered
form without coupons and only in such denominations as shall be specified as
contemplated by Section 301.  In the absence of any such specified denomination
with respect to the Securities of any series, the Securities of such series
shall be issuable in denominations of $1,000 and any integral multiple thereof.

SECTION 303.     EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

         The Securities shall be executed on behalf of the Company by its
Chairman of the Board, its Vice Chairman of the Board, its principal financial
officer, its President or one of its Vice Presidents, under its corporate seal
reproduced thereon attested by its Treasurer, its Assistant Treasurer, its
Secretary or one of its Assistant Secretaries.  The signature of any of these
officers on the Securities may be manual or facsimile.

         Securities bearing the manual or facsimile signatures of individuals
who were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities of any series executed by
the Company to the Trustee for authentication, together with a Company Order
for the authentication and delivery of such Securities, and the Trustee in
accordance with the Company Order shall authenticate and deliver such
Securities.  If the form or terms of the Securities of the series have been
established by or pursuant to one or more Board Resolutions as permitted by
Sections 201 and 301, in authenticating such Securities, and accepting the
additional responsibilities under this Indenture in relation to such
Securities, the Trustee shall be entitled to receive, and (subject to Section
601) shall be fully protected in relying upon, a copy of such Board Resolution,
the Officers' Certificate setting forth the terms of the series and an Opinion
of Counsel, with such Opinion of Counsel stating,

         (1)     if the form of such Securities has been established by or
pursuant to Board Resolution as permitted by Section 201, that such form has
been established in conformity with the provisions of this Indenture;

         (2)     if the terms of such Securities have been established by or
pursuant to Board Resolution as permitted by Section 301, that such terms have
been established in conformity with the provisions of this Indenture; and

         (3)     that such Securities, when authenticated and delivered by the
Trustee and issued by the Company in the manner and subject to any conditions
specified in such Opinion of Counsel, will constitute valid and legally binding
obligations of the Company enforceable in accordance with their terms, subject
to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
similar laws of general applicability relating to or affecting creditors'
rights and to general equity principles.





                                        -26-
<PAGE>   36

         If such form or terms have been so established, the Trustee shall not
be required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonably acceptable to the Trustee.

         Notwithstanding the provisions of Section 301 and of the preceding
paragraph, if all Securities of a series are not to be originally issued at one
time, it shall not be necessary to deliver the Officers' Certificate otherwise
required pursuant to Section 301 or the Company Order and Opinion of Counsel
otherwise required pursuant to such preceding paragraph at or prior to the
authentication of each Security of such series if such documents are delivered
at or prior to the authentication upon original issuance of the first Security
of such series to be issued.

         Each Security shall be dated the date of its authentication.

         No Security shall be entitled to any benefit under this Indenture or
be valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such
Security has been duly authenticated and delivered hereunder.  Notwithstanding
the foregoing, if any Security shall have been authenticated and delivered
hereunder but never issued and sold by the Company, and the Company shall
deliver such Security to the Trustee for cancellation as provided in Section
309, for all purposes of this Indenture such Security shall be deemed never to
have been authenticated and delivered hereunder and shall never be entitled to
the benefits of this Indenture.

SECTION 304.     TEMPORARY SECURITIES.

         Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten,
mimeographed or otherwise produced, in any authorized denomination,
substantially of the tenor of the definitive Securities in lieu of which they
are issued and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.

         If temporary Securities of any series are issued, the Company will
cause definitive Securities of that series to be prepared without unreasonable
delay.  After the preparation of definitive Securities of such series, the
temporary Securities of such series shall be exchangeable for definitive
Securities of such series upon surrender of the temporary Securities of such
series at the office or agency of the Company in a Place of Payment for that
series, without charge to the Holder.  Upon surrender for cancellation of any
one or more temporary Securities of any series, the Company shall execute and
the Trustee shall authenticate and deliver in exchange therefor one or more
definitive Securities of the same series, of any authorized denominations and
of like tenor and aggregate principal amount.  Until so exchanged, the
temporary Securities of any series shall in all respects be entitled to the
same benefits under this Indenture as definitive Securities of such series and
tenor.





                                        -27-
<PAGE>   37

SECTION 305.     REGISTRATION; REGISTRATION OF TRANSFER AND EXCHANGE.

         The Company shall cause to be kept at the Corporate Trust Office of
the Trustee a register (the register maintained in such office and in any other
office or agency of the Company in a Place of Payment being herein sometimes
collectively referred to as the "Security Register") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for the
registration of Securities and of transfers of Securities.  The Trustee is
hereby appointed "Security Registrar" for the purpose of registering Securities
and transfers of Securities as herein provided.

         Upon surrender for registration of transfer of any Security of a
series at the office or agency of the Company in a Place of Payment for that
series, the Company shall execute, and the Trustee shall authenticate and
deliver, in the name of the designated transferee or transferees, one or more
new Securities of the same series, of any authorized denominations and of like
tenor and aggregate principal amount.

         At the option of the Holder, Securities of any series may be exchanged
for other Securities of the same series, of any authorized denominations and of
like tenor and aggregate principal amount, upon surrender of the Securities to
be exchanged at such office or agency.  Whenever any Securities are so
surrendered for exchange, the Company shall execute, and the Trustee shall
authenticate and deliver, the Securities which the Holder making the exchange
is entitled to receive.

         All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

         Every Security presented or surrendered for registration of transfer
or for exchange shall (if so required by the Company or the Trustee) be duly
endorsed, or be accompanied by a written instrument of transfer in form
satisfactory to the Company and the Security Registrar duly executed, by the
Holder thereof or its attorney duly authorized in writing.

         No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

         If the Securities of any series (or of any series and specified tenor)
are to be redeemed in part, the Company shall not be required (A) to issue,
register the transfer of or exchange any Securities of that series (or of that
series and specified tenor, as the case may be) during a period beginning at
the opening of business 15 days before the day of the mailing of a notice of
redemption of any such Securities selected for redemption under Section 1103
and ending at the close of business on the day of such mailing, or (B) to
register the transfer of or exchange any Security so selected for redemption in
whole or in part, except the unredeemed portion of any Security being redeemed
in part.

         The provisions of Clauses (1), (2), (3) and (4) below shall apply only
to Global Securities:





                                        -28-
<PAGE>   38


         (1)     Each Global Security authenticated under this Indenture shall
be registered in the name of the Depositary designated for such Global Security
or a nominee thereof and delivered to such Depositary or a nominee thereof or
custodian therefor, and each such Global Security shall constitute a single
Security for all purposes of this Indenture.

         (2)     Notwithstanding any other provision in this Indenture, no
Global Security may be exchanged in whole or in part for Securities registered,
and no transfer of a Global Security in whole or in part may be registered, in
the name of any Person other than the Depositary for such Global Security or a
nominee thereof unless (A) such Depositary (i) has notified the Company that it
is unwilling or unable to continue as Depositary for such Global Security or
(ii) has ceased to be a clearing agency registered under the Exchange Act, (B)
there shall have occurred and be continuing an Event of Default with respect to
such Global Security or (C) there shall exist such circumstances, if any, in
addition to or in lieu of the foregoing as have been specified for this purpose
as contemplated by Section 301.

         (3)     Subject to Clause (2) above, any exchange of a Global Security
for other Securities may be made in whole or in part, and all Securities issued
in exchange for a Global Security or any portion thereof shall be registered in
such names as the Depositary for such Global Security shall direct.

         (4)     Every Security authenticated and delivered upon registration
of transfer of, or in exchange for or in lieu of, a Global Security or any
portion thereof, whether pursuant to this Section, Section 304, 306, 906 or
1107 or otherwise, shall be authenticated and delivered in the form of, and
shall be, a Global Security, unless such Security is registered in the name of
a Person other than the Depositary for such Global Security or a nominee
thereof.

SECTION 306.     MUTILATED, DESTROYED, LOST AND STOLEN SECURITIES.

         If any mutilated Security is surrendered to the Trustee, the Company
shall execute and the Trustee shall authenticate and deliver in exchange
therefor a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

         If there shall be delivered to the Company and the Trustee (i)
evidence to their satisfaction of the destruction, loss or theft of any
Security and (ii) such security or indemnity as may be required by them to save
each of them and any agent of either of them harmless, then, in the absence of
notice to the Company or the Trustee that such Security has been acquired by a
bona fide purchaser, the Company shall execute and the Trustee shall
authenticate and deliver, in lieu of any such destroyed, lost or stolen
Security, a new Security of the same series and of like tenor and principal
amount and bearing a number not contemporaneously outstanding.

         In case any such mutilated, destroyed, lost or stolen Security has
become or is about to become due and payable, the Company in its discretion
may, instead of issuing a new Security, pay such Security.



                                        -29-
<PAGE>   39

         Upon the issuance of any new Security under this Section, the Company
may require the payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in relation thereto and any other
expenses (including the fees and expenses of the Trustee) connected therewith.

         Every new Security of any series issued pursuant to this Section in
lieu of any destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Security shall be at any time enforceable by anyone, and shall
be entitled to all the benefits of this Indenture equally and proportionately
with any and all other Securities of that series duly issued hereunder.

         The provisions of this Section are exclusive and shall preclude (to
the extent lawful) all other rights and remedies with respect to the
replacement or payment of mutilated, destroyed, lost or stolen Securities.

SECTION 307.     PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.

         Except as otherwise provided as contemplated by Section 301 with
respect to any series of Securities, interest on any Security which is payable,
and is punctually paid or duly provided for, on any Interest Payment Date shall
be paid to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest.

         Any interest on any Security of any series which is payable, but is
not punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the Holder
on the relevant Regular Record Date by virtue of having been such Holder, and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

         (1)     The Company may elect to make payment of any Defaulted
Interest to the Persons in whose names the Securities of such series (or their
respective Predecessor Securities) are registered at the close of business on a
Special Record Date for the payment of such Defaulted Interest, which shall be
fixed in the following manner.  The Company shall notify the Trustee in writing
of the amount of Defaulted Interest proposed to be paid on each Security of
such series and the date of the proposed payment, and at the same time the
Company shall deposit with the Trustee an amount of money equal to the
aggregate amount proposed to be paid in respect of such Defaulted Interest or
shall make arrangements satisfactory to the Trustee for such deposit prior to
the date of the proposed payment, such money when deposited to be held in trust
for the benefit of the Persons entitled to such Defaulted Interest as in this
Clause provided.  Thereupon the Trustee shall fix a Special Record Date for the
payment of such Defaulted Interest which shall be not more than 15 days and not
less than 10 days prior to the date of the proposed payment and not less than
10 days after the receipt by the Trustee of the notice of the proposed payment.
The Trustee shall promptly notify the Company of such Special Record Date and,
in the name and at the expense of the Company, shall cause notice of the
proposed payment of such Defaulted Interest and the Special Record Date
therefor





                                        -30-
<PAGE>   40

to be given to each Holder of Securities of such series in the manner set forth
in Section 106, not less than 10 days prior to such Special Record Date.
Notice of the proposed payment of such Defaulted Interest and the Special
Record Date therefor having been so mailed, such Defaulted Interest shall be
paid to the Persons in whose names the Securities of such series (or their
respective Predecessor Securities) are registered at the close of business on
such Special Record Date and shall no longer be payable pursuant to the
following Clause (2).

         (2)     The Company may make payment of any Defaulted Interest on the
Securities of any series in any other lawful manner not inconsistent with the
requirements of any securities exchange on which such Securities may be listed,
and upon such notice as may be required by such exchange, if, after notice
given by the Company to the Trustee of the proposed payment pursuant to this
Clause, such manner of payment shall be deemed practicable by the Trustee.

         Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall carry the rights to interest accrued
and unpaid, and to accrue, which were carried by such other Security.

         Subject to the provisions of Section 1402, in the case of any Security
(or any part thereof) which is converted after any Regular Record Date and on
or prior to the next succeeding Interest Payment Date (other than any Security
the principal of (or premium, if any, on) which shall become due and payable,
whether at Stated Maturity or by declaration of acceleration or otherwise prior
to such Interest Payment Date), interest whose Stated Maturity is on such
Interest Payment Date shall be payable on such Interest Payment Date
notwithstanding such conversion and such interest (whether or not punctually
paid or duly provided for) shall be paid to the Person in whose name that
Security (or any one or more Predecessor Securities) is registered at the close
of business on such Regular Record Date.  Except as otherwise expressly
provided in the immediately preceding sentence or in Section 1402, in the case
of any Security (or any part thereof) which is converted, interest whose Stated
Maturity is after the date of conversion of such Security (or such part
thereof) shall not be payable.

SECTION 308.     PERSONS DEEMED OWNERS.

         Prior to due presentment of a Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name such Security is registered as the owner of such
Security for the purpose of receiving payment of principal of and any premium
and (subject to Section 307) any interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

SECTION 309.     CANCELLATION.

         All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall, if
surrendered to any Person other than the Trustee,





                                        -31-
<PAGE>   41

be delivered to the Trustee and shall be promptly canceled by it.  The Company
may at any time deliver to the Trustee for cancellation any Securities
previously authenticated and delivered hereunder which the Company may have
acquired in any manner whatsoever, and may deliver to the Trustee (or to any
other Person for delivery to the Trustee) for cancellation any Securities
previously authenticated hereunder which the Company has not issued and sold,
and all Securities so delivered shall be promptly canceled by the Trustee.  No
Securities shall be authenticated in lieu of or in exchange for any Securities
canceled as provided in this Section, except as expressly permitted by this
Indenture.  All canceled Securities held by the Trustee shall be disposed of as
directed by a Company Order.

SECTION 310.     COMPUTATION OF INTEREST.

         Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.

                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401.     SATISFACTION AND DISCHARGE OF INDENTURE.

         This Indenture shall upon Company Request cease to be of further
effect (except as to any surviving rights of registration of transfer or
exchange of Securities herein expressly provided for), and the Trustee, at the
expense of the Company, shall execute proper instruments acknowledging
satisfaction and discharge of this Indenture, when

         (1)     either

                 (A)      all Securities theretofore authenticated and
         delivered (other than (i) Securities which have been destroyed, lost
         or stolen and which have been replaced or paid as provided in Section
         306 and (ii) Securities for whose payment money has theretofore been
         deposited in trust or segregated and held in trust by the Company and
         thereafter repaid to the Company or discharged from such trust, as
         provided in Section 1003) have been delivered to the Trustee for
         cancellation; or

                 (B)      all such Securities not theretofore delivered to the
         Trustee for cancellation

                           (i)    have become due and payable, or

                          (ii)    will become due and payable at their Stated
         Maturity within one year, or





                                        -32-
<PAGE>   42

                         (iii)    are to be called for redemption within one
         year under arrangements satisfactory to the Trustee for the giving of
         notice of redemption by the Trustee in the name, and at the expense,
         of the Company,

         and the Company, in the case of (i), (ii) or (iii) above, has
         deposited or caused to be deposited with the Trustee as trust funds in
         trust for the purpose money in an amount sufficient to pay and
         discharge the entire indebtedness on such Securities not theretofore
         delivered to the Trustee for cancellation, for principal and any
         premium and interest to the date of such deposit (in the case of
         Securities which have become due and payable) or to the Stated
         Maturity or Redemption Date, as the case may be;

         (2)     the Company has paid or caused to be paid all other sums
payable hereunder by the Company; and

         (3)     the Company has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent herein provided for relating to the satisfaction and discharge of
this Indenture have been complied with.

         Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Trustee to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to subclause (B) of Clause (1) of
this Section, the obligations of the Trustee under Section 402 and the last
paragraph of Section 1003 shall survive.

SECTION 402.     APPLICATION OF TRUST MONEY.

         Subject to the provisions of the last paragraph of Section 1003, all
money deposited with the Trustee pursuant to Section 401 shall be held in trust
and applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and any premium
and interest for whose payment such money has been deposited with the Trustee.

                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501.     EVENTS OF DEFAULT.

         "Event of Default," wherever used herein with respect to Securities of
any series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be occasioned by the provisions of
Article Fifteen or be voluntary or involuntary or be effected by operation of
law or pursuant to any judgment, decree or order of any court or any order,
rule or regulation of any administrative or governmental body):





                                        -33-
<PAGE>   43


         (1)     default in the payment of any interest upon any Security of
that series when it becomes due and payable, and continuance of such default
for a period of 30 days; or

         (2)     default in the payment of the principal of or any premium on
any Security of that series at its Maturity; or

         (3)     default in the deposit of any sinking fund payment, when and
as due by the terms of a Security of that series; or

         (4)     default in the performance, or breach, of any covenant or
warranty of the Company in this Indenture (other than a covenant or warranty a
default in whose performance or whose breach is elsewhere in this Section
specifically dealt with or which has expressly been included in this Indenture
solely for the benefit of series of Securities other than that series), and
continuance of such default or breach for a period of 60 days after there has
been given, by registered or certified mail, to the Company by the Trustee or
to the Company and the Trustee by the Holders of at least 25% in principal
amount of the Outstanding Securities of that series a written notice specifying
such default or breach and requiring it to be remedied and stating that such
notice is a "Notice of Default" hereunder; or

         (5)     the entry by a court having jurisdiction in the premises of
(A) a decree or order for relief in respect of the Company in an involuntary
case or proceeding under any applicable Federal or State bankruptcy,
insolvency, reorganization or other similar law or (B) a decree or order
adjudging the Company a bankrupt or insolvent, or approving as properly filed a
petition seeking reorganization, arrangement, adjustment or composition of or
in respect of the Company under any applicable Federal or State law, or
appointing a custodian, receiver, liquidator, assignee, trustee, sequestrator
or other similar official of the Company or of any substantial part of its
property, or ordering the winding up or liquidation of its affairs, and the
continuance of any such decree or order for relief or any such other decree or
order unstayed and in effect for a period of 90 consecutive days; or

         (6)     the commencement by the Company of a voluntary case or
proceeding under any applicable Federal or State bankruptcy, insolvency,
reorganization or other similar law or of any other case or proceeding to be
adjudicated a bankrupt or insolvent, or the consent by it to the entry of a
decree or order for relief in respect of the Company in an involuntary case or
proceeding under any applicable Federal or State bankruptcy, insolvency,
reorganization or other similar law or to the commencement of any bankruptcy or
insolvency case or proceeding against it, or the filing by it of a petition or
answer or consent seeking reorganization or relief under any applicable Federal
or State law, or the consent by it to the filing of such petition or to the
appointment of or taking possession by a custodian, receiver, liquidator,
assignee, trustee, sequestrator or other similar official of the Company or of
any substantial part of its property, or the making by it of an assignment for
the benefit of creditors, or the admission by it in writing of its inability to
pay its debts generally as they become due, or the taking of corporate action
by the Company in furtherance of any such action; or

         (7)     any other Event of Default provided with respect to Securities
of that series.





                                        -34-
<PAGE>   44


SECTION 502.     ACCELERATION OF MATURITY; RESCISSION AND ANNULMENT.

         If an Event of Default (other than an Event of Default specified in
Section 501(5) or 501(6)) with respect to Securities of any series at the time
Outstanding occurs and is continuing, then in every such case the Trustee or
the Holders of not less than 25% in principal amount of the Outstanding
Securities of that series may declare the principal amount of all the
Securities of that series (or, if any Securities of that series are Original
Issue Discount Securities, such portion of the principal amount of such
Securities as may be specified by the terms thereof) to be due and payable
immediately, by a notice in writing to the Company (and to the Trustee if given
by Holders), and upon any such declaration such principal amount (or specified
amount) shall become immediately due and payable.  If an Event of Default
specified in Section 501(5) or 501(6) with respect to Securities of any series
at the time Outstanding occurs, the principal amount of all the Securities of
that series (or, if any Securities of that series are Original Issue Discount
Securities, such portion of the principal amount of such Securities as may be
specified by the terms thereof) shall automatically, and without any
declaration or other action on the part of the Trustee or any Holder, become
immediately due and payable.  Any payments by the Company on the Securities
following any such acceleration will be subject to the subordination provisions
of Article Fifteen to the extent provided therein.

         At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in
this Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

         (1)     the Company has paid or deposited with the Trustee a sum
sufficient to pay

                 (A)      all overdue interest on all Securities of that
         series,

                 (B)      the principal of (and premium, if any, on) any
         Securities of that series which have become due otherwise than by such
         declaration of acceleration and any interest thereon at the rate or
         rates prescribed therefor in such Securities,

                 (C)      to the extent that payment of such interest is
         lawful, interest upon overdue interest at the rate or rates prescribed
         therefor in such Securities, and

                 (D)      all sums paid or advanced by the Trustee hereunder
         and the reasonable compensation, expenses, disbursements and advances
         of the Trustee, its agents and counsel; and

         (2)     all Events of Default with respect to Securities of that
series, other than the non-payment of the principal of Securities of that
series which have become due solely by such declaration of acceleration, have
been cured or waived as provided in Section 513.





                                        -35-
<PAGE>   45

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

SECTION 503.     COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY
                 TRUSTEE.

         The Company covenants that if

         (1)     default is made in the payment of any interest on any Security
when such interest becomes due and payable and such default continues for a
period of 30 days, or

         (2)     default is made in the payment of the principal of (or
premium, if any, on) any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on such
Securities for principal and any premium and interest and, to the extent that
payment of such interest shall be legally enforceable, interest on any overdue
principal and premium and on any overdue interest, at the rate or rates
prescribed therefor in such Securities, and, in addition thereto, such further
amount as shall be sufficient to cover the costs and expenses of collection,
including the reasonable compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel.

         If an Event of Default with respect to Securities of any series occurs
and is continuing, the Trustee may in its discretion proceed to protect and
enforce its rights and the rights of the Holders of Securities of such series
by such appropriate judicial proceedings as the Trustee shall deem most
effectual to protect and enforce any such rights, whether for the specific
enforcement of any covenant or agreement in this Indenture or in aid of the
exercise of any power granted herein, or to enforce any other proper remedy.

SECTION 504.     TRUSTEE MAY FILE PROOFS OF CLAIM.

         In case of any judicial proceeding relative to the Company (or any
other obligor upon the Securities), its property or its creditors, the Trustee
shall be entitled and empowered, by intervention in such proceeding or
otherwise, to take any and all actions authorized under the Trust Indenture Act
in order to have claims of the Holders and the Trustee allowed in any such
proceeding.  In particular, the Trustee shall be authorized to collect and
receive any moneys or other property payable or deliverable on any such claims
and to distribute the same; and any custodian, receiver, assignee, trustee,
liquidator, sequestrator or other similar official in any such judicial
proceeding is hereby authorized by each Holder to make such payments to the
Trustee and, in the event that the Trustee shall consent to the making of such
payments directly to the Holders, to pay to the Trustee any amount due it for
the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 607.

         No provision of this Indenture shall be deemed to authorize the
Trustee to authorize or consent to or accept or adopt on behalf of any Holder
any plan of reorganization, arrangement, adjustment or composition affecting
the Securities or the rights of any Holder thereof or to authorize





                                        -36-
<PAGE>   46

the Trustee to vote in respect of the claim of any Holder in any such
proceeding; provided, however, that the Trustee may, on behalf of the Holders,
vote for the election of a trustee in bankruptcy or similar official and be a
member of a creditors' or other similar committee.

SECTION 505.     TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF SECURITIES.

         All rights of action and claims under this Indenture or the Securities
may be prosecuted and enforced by the Trustee without the possession of any of
the Securities or the production thereof in any proceeding relating thereto,
and any such proceeding instituted by the Trustee shall be brought in its own
name as trustee of an express trust, and any recovery of judgment shall, after
provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

SECTION 506.     APPLICATION OF MONEY COLLECTED.

         Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any
premium or interest, upon presentation of the Securities and the notation
thereon of the payment if only partially paid and upon surrender thereof if
fully paid:

         FIRST:  To the payment of all amounts due the Trustee under Section
607; and

         SECOND:  Subject to Article Fifteen, to the payment of the amounts
then due and unpaid for principal of and any premium, if any, and interest on
the Securities in respect of which or for the benefit of which such money has
been collected, ratably, without preference or priority of any kind, according
to the amounts due and payable on such Securities for principal and any
premium, if any, and interest, respectively.

SECTION 507.     LIMITATION ON SUITS.

         No Holder of any Security of any series shall have any right to
institute any proceeding, judicial or otherwise, with respect to this
Indenture, or for the appointment of a receiver or trustee, or for any other
remedy hereunder, unless

         (1)     such Holder has previously given written notice to the Trustee
of a continuing Event of Default with respect to the Securities of that series;

         (2)     the Holders of not less than 25% in principal amount of the
Outstanding Securities of that series shall have made written request to the
Trustee to institute proceedings in respect of such Event of Default in its own
name as Trustee hereunder;

         (3)     such Holder or Holders have offered to the Trustee reasonable
indemnity against the costs, expenses and liabilities to be incurred in
compliance with such request;





                                        -37-
<PAGE>   47


         (4)     the Trustee for 60 days after its receipt of such notice,
request and offer of indemnity has failed to institute any such proceeding; and

         (5)     no direction inconsistent with such written request has been
given to the Trustee during such 60-day period by the Holders of a majority in
principal amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all of such
Holders.

SECTION 508.     UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, PREMIUM
                 AND INTEREST AND TO CONVERT.

         Notwithstanding any other provision in this Indenture, the Holder of
any Security shall have the right, which is absolute and unconditional, to
receive payment of the principal of and any premium and (subject to Section
307) interest on such Security on the respective Stated Maturities expressed in
such Security (or, in the case of redemption, on the Redemption Date), to
convert such Securities in accordance with Article Fourteen and to institute
suit for the enforcement of any such payment, and such rights shall not be
impaired without the consent of such Holder.

SECTION 509.     RESTORATION OF RIGHTS AND REMEDIES.

         If the Trustee or any Holder has instituted any proceeding to enforce
any right or remedy under this Indenture and such proceeding has been
discontinued or abandoned for any reason, or has been determined adversely to
the Trustee or to such Holder, then and in every such case, subject to any
determination in such proceeding, the Company, the Trustee and the Holders
shall be restored severally and respectively to their former positions
hereunder and thereafter all rights and remedies of the Trustee and the Holders
shall continue as though no such proceeding had been instituted.

SECTION 510.     RIGHTS AND REMEDIES CUMULATIVE.

         Except as otherwise provided with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities in the last
paragraph of Section 306, no right or remedy herein conferred upon or reserved
to the Trustee or to the Holders is intended to be exclusive of any other right
or remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise.  The assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent
the concurrent assertion or employment of any other appropriate right or
remedy.

SECTION 511.     DELAY OR OMISSION NOT WAIVER.





                                        -38-
<PAGE>   48

         No delay or omission of the Trustee or of any Holder of any Securities
to exercise any right or remedy accruing upon any Event of Default shall impair
any such right or remedy or constitute a waiver of any such Event of Default or
an acquiescence therein.  Every right and remedy given by this Article or by
law to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee (subject to the limitations
contained in this Indenture) or by the Holders, as the case may be.

SECTION 512.     CONTROL BY HOLDERS.

         The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that

         (1)     such direction shall not be in conflict with any rule of law
or with this Indenture and the Trustee shall not have determined that the
action so directed would be unjustly prejudicial to Holders of Securities of
that series, or any other series, not taking part in such direction; and

         (2)     the Trustee may take any other action deemed proper by the
Trustee which is not inconsistent with such direction or this Indenture.

SECTION 513.     WAIVER OF PAST DEFAULTS.

         The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series may on behalf of the Holders of all the
Securities of such series waive any past default hereunder with respect to such
series and its consequences, except a default

         (1)     in the payment of the principal of or any premium or interest
on any Security of such series, or

         (2)     in respect of a covenant or provision hereof which under
Article Nine cannot be modified or amended without the consent of the Holder of
each Outstanding Security of such series affected.

         Upon any such waiver, such default shall cease to exist, and any Event
of Default arising therefrom shall be deemed to have been cured, for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other default or impair any right consequent thereon.

SECTION 514.     UNDERTAKING FOR COSTS.

         In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit
to file an undertaking to pay the costs of such suit, and may assess costs
against any such party litigant, in the manner and to the extent provided in
the Trust Indenture Act;





                                        -39-
<PAGE>   49

provided that neither this Section nor the Trust Indenture Act shall be deemed
to authorize any court to require such an undertaking or to make such an
assessment in any suit instituted by the Company or in any suit for the
enforcement of the right to convert any Security in accordance with Article
Fourteen.

SECTION 515.     WAIVER OF USURY, STAY OR EXTENSION LAWS.

         The Company covenants (to the extent that it may lawfully do so) that
it will not at any time insist upon, or plead, or in any manner whatsoever
claim or take the benefit or advantage of, any usury, stay or extension law
wherever enacted, now or at any time hereafter in force, which may affect the
covenants or the performance of this Indenture; and the Company (to the extent
that it may lawfully do so) hereby expressly waives all benefit or advantage of
any such law and covenants that it will not hinder, delay or impede the
execution of any power herein granted to the Trustee, but will suffer and
permit the execution of every such power as though no such law had been
enacted.

                                  ARTICLE SIX

                                  THE TRUSTEE

SECTION 601.     CERTAIN DUTIES AND RESPONSIBILITIES.

         The duties and responsibilities of the Trustee shall be as provided by
the Trust Indenture Act.  Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, or in the exercise of any of its rights or powers, if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.
Whether or not therein expressly so provided, every provision of this Indenture
relating to the conduct or affecting the liability of or affording protection
to the Trustee shall be subject to the provisions of this Section.

SECTION 602.     NOTICE OF DEFAULTS.

         If a default occurs hereunder with respect to Securities of any
series, the Trustee shall give the Holders of Securities of such series notice
of such default as and to the extent provided by the Trust Indenture Act;
provided, however, that in the case of any default of the character specified
in Section 501(4) with respect to Securities of such series, no such notice to
Holders shall be given until at least 30 days after the occurrence thereof.
For the purpose of this Section, the term "default" means any event which is,
or after notice or lapse of time or both would become, an Event of Default with
respect to Securities of such series.





                                        -40-
<PAGE>   50

SECTION 603.     CERTAIN RIGHTS OF TRUSTEE.

         Subject to the provisions of Section 601:

         (1)     the Trustee may rely and shall be protected in acting or
refraining from acting upon any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document believed by it
to be genuine and to have been signed or presented by the proper party or
parties;

         (2)     any request or direction of the Company mentioned herein shall
be sufficiently evidenced by a Company Request or Company Order, and any
resolution of the Board of Directors shall be sufficiently evidenced by a Board
Resolution;

         (3)     whenever in the administration of this Indenture the Trustee
shall deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its
part, rely upon an Officers' Certificate;

         (4)     the Trustee may consult with counsel and the written advice of
such counsel or any Opinion of Counsel shall be full and complete authorization
and protection in respect of any action taken, suffered or omitted by it
hereunder in good faith and in reliance thereon;

         (5)     the Trustee shall be under no obligation to exercise any of
the rights or powers vested in it by this Indenture at the request or direction
of any of the Holders pursuant to this Indenture, unless such Holders shall
have offered to the Trustee reasonable security or indemnity against the costs,
expenses and liabilities which might be incurred by it in compliance with such
request or direction;

         (6)     the Trustee shall not be bound to make any investigation into
the facts or matters stated in any resolution, certificate, statement,
instrument, opinion, report, notice, request, direction, consent, order, bond,
debenture, note, other evidence of indebtedness or other paper or document, but
the Trustee, in its discretion, may make such further inquiry or investigation
into such facts or matters as it may see fit, and, if the Trustee shall
determine to make such further inquiry or investigation, it shall be entitled
to examine the books, records and premises of the Company, personally or by
agent or attorney; and

         (7)     the Trustee may execute any of the trusts or powers hereunder
or perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder.

SECTION 604.     NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF SECURITIES.





                                        -41-
<PAGE>   51

         The recitals contained herein and in the Securities, except the
Trustee's certificates of authentication, shall be taken as the statements of
the Company, and neither the Trustee nor any Authenticating Agent assumes any
responsibility for their correctness.  The Trustee makes no representations as
to the validity or sufficiency of this Indenture or of the Securities.  Neither
the Trustee nor any Authenticating Agent shall be accountable for the use or
application by the Company of Securities or the proceeds thereof.

SECTION 605.     MAY HOLD SECURITIES AND ACT AS TRUSTEE UNDER OTHER INDENTURES.

         The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to
Sections 608 and 613, may otherwise deal with the Company with the same rights
it would have if it were not Trustee, Authenticating Agent, Paying Agent,
Security Registrar or such other agent.

         Subject to the limitations imposed by the Trust Indenture Act, nothing
in this Indenture shall prohibit the Trustee from becoming and acting as
trustee under other indentures under which other securities, or certificates of
interest of participation in other securities, of the Company are outstanding
in the same manner as if it were not Trustee hereunder.

SECTION 606.     MONEY HELD IN TRUST.

         Money held by the Trustee in trust hereunder need not be segregated
from other funds except to the extent required by law.  The Trustee shall be
under no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

SECTION 607.     COMPENSATION AND REIMBURSEMENT.

         The Company agrees

         (1)     to pay to the Trustee from time to time reasonable
compensation for all services rendered by it hereunder (which compensation
shall not be limited by any provision of law in regard to the compensation of a
trustee of an express trust);

         (2)     except as otherwise expressly provided herein, to reimburse
the Trustee upon its request for all reasonable expenses, disbursements and
advances incurred or made by the Trustee in accordance with any provision of
this Indenture (including the reasonable compensation and the expenses and
disbursements of its agents and counsel), except any such expense, disbursement
or advance as may be attributable to its negligence or bad faith; and

         (3)     to indemnify the Trustee for, and to hold it harmless against,
any loss, liability or expense incurred without negligence or bad faith on its
part, arising out of or in connection with the acceptance or administration of
the trust or trusts hereunder, including the costs and expenses of





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<PAGE>   52

defending itself against any claim or liability in connection with the exercise
or performance of any of its powers or duties hereunder.

SECTION 608.     CONFLICTING INTERESTS.

         If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture.  To the extent
permitted by such Act, the Trustee shall not be deemed to have a conflicting
interest by virtue of being a trustee under this Indenture with respect to
Securities of more than one series.

SECTION 609.     CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

         There shall at all times be one (and only one) Trustee hereunder with
respect to the Securities of each series, which may be Trustee hereunder for
Securities of one or more other series.  Each Trustee shall be a Person that is
eligible pursuant to the Trust Indenture Act to act as such and has (or if the
Trustee is a member of a bank holding company system, its bank holding company
has) a combined capital and surplus of at least $50,000,000.  If any such
Person publishes reports of condition at least annually, pursuant to law or to
the requirements of its supervising or examining authority, then for the
purposes of this Section and to the extent permitted by the Trust Indenture
Act, the combined capital and surplus of such Person shall be deemed to be its
combined capital and surplus as set forth in its most recent report of
condition so published.  If at any time the Trustee with respect to the
Securities of any series shall cease to be eligible in accordance with the
provisions of this Section, it shall resign immediately in the manner and with
the effect hereinafter specified in this Article.

SECTION 610.     RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

         No resignation or removal of the Trustee and no appointment of a
successor Trustee pursuant to this Article shall become effective until the
acceptance of appointment by the successor Trustee in accordance with the
applicable requirements of Section 611.

         The Trustee may resign at any time with respect to the Securities of
one or more series by giving written notice thereof to the Company.  If the
instrument of acceptance by a successor Trustee required by Section 611 shall
not have been delivered to the Trustee within 30 days after the giving of such
notice of resignation, the resigning Trustee may petition any court of
competent jurisdiction for the appointment of a successor Trustee with respect
to the Securities of such series.

         The Trustee may be removed at any time with respect to the Securities
of any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.





                                        -43-
<PAGE>   53

         If at any time:

         (1)     the Trustee shall fail to comply with Section 608 after
written request therefor by the Company or by any Holder who has been a bona
fide Holder of a Security for at least six months, or

         (2)     the Trustee shall cease to be eligible under Section 609 and
shall fail to resign after written request therefor by the Company or by any
such Holder, or

         (3)     the Trustee shall become incapable of acting or shall be
adjudged a bankrupt or insolvent or a receiver of the Trustee or of its
property shall be appointed or any public officer shall take charge or control
of the Trustee or of its property or affairs for the purpose of rehabilitation,
conservation or liquidation,

then, in any such case, (A) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (B) subject to Section 514, any
Holder who has been a bona fide Holder of a Security for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the removal of the Trustee with respect to all
Securities and the appointment of a successor Trustee or Trustees.

         If the Trustee shall resign, be removed or become incapable of acting,
or if a vacancy shall occur in the office of Trustee for any cause, with
respect to the Securities of one or more series, the Company, by a Board
Resolution, shall promptly appoint a successor Trustee or Trustees with respect
to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of one or
more or all of such series and that at any time there shall be only one Trustee
with respect to the Securities of any particular series) and shall comply with
the applicable requirements of Section 611.  If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the Securities of any series shall be
appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its
acceptance of such appointment in accordance with the applicable requirements
of Section 611, become the successor Trustee with respect to the Securities of
such series and to that extent supersede the successor Trustee appointed by the
Company.  If no successor Trustee with respect to the Securities of any series
shall have been so appointed by the Company or the Holders and accepted
appointment in the manner required by Section 611, the retiring Trustee may
petition, any Holder who has been a bona fide Holder of a Security of such
series for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the
appointment of a successor Trustee with respect to the Securities of such
series.

         The Company shall give notice of each resignation and each removal of
the Trustee with respect to the Securities of any series and each appointment
of a successor Trustee with respect to the Securities of any series to all
Holders of Securities of such series in the manner provided in





                                        -44-
<PAGE>   54

Section 106.  Each notice shall include the name of the successor Trustee with
respect to the Securities of such series and the address of its Corporate Trust
Office.

SECTION 611.     ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

         In case of the appointment hereunder of a successor Trustee with
respect to all Securities, every such successor Trustee so appointed shall
execute, acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without any further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee; but, on the request
of the Company or the successor Trustee, such retiring Trustee shall, upon
payment of its charges, execute and deliver an instrument transferring to such
successor Trustee all the rights, powers and trusts of the retiring Trustee and
shall duly assign, transfer and deliver to such successor Trustee all property
and money held by such retiring Trustee hereunder.

         In case of the appointment hereunder of a successor Trustee with
respect to the Securities of one or more (but not all) series, the Company, the
retiring Trustee and each successor Trustee with respect to the Securities of
one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which (1)
shall contain such provisions as shall be necessary or desirable to transfer
and confirm to, and to vest in, each successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of
that or those series to which the appointment of such successor Trustee
relates, (2) if the retiring Trustee is not retiring with respect to all
Securities, shall contain such provisions as shall be deemed necessary or
desirable to confirm that all the rights, powers, trusts and duties of the
retiring Trustee with respect to the Securities of that or those series as to
which the retiring Trustee is not retiring shall continue to be vested in the
retiring Trustee, and (3) shall add to or change any of the provisions of this
Indenture as shall be necessary to provide for or facilitate the administration
of the trusts hereunder by more than one Trustee, it being understood that
nothing herein or in such supplemental indenture shall constitute such Trustees
co-trustees of the same trust and that each such Trustee shall be trustee of a
trust or trusts hereunder separate and apart from any trust or trusts hereunder
administered by any other such Trustee; and upon the execution and delivery of
such supplemental indenture the resignation or removal of the retiring Trustee
shall become effective to the extent provided therein and each such successor
Trustee, without any further act, deed or conveyance, shall become vested with
all the rights, powers, trusts and duties of the retiring Trustee with respect
to the Securities of that or those series to which the appointment of such
successor Trustee relates; but, on request of the Company or any successor
Trustee, such retiring Trustee shall duly assign, transfer and deliver to such
successor Trustee all property and money held by such retiring Trustee
hereunder with respect to the Securities of that or those series to which the
appointment of such successor Trustee relates.

         Upon request of any such successor Trustee, the Company shall execute
any and all instruments for more fully and certainly vesting in and confirming
to such successor Trustee all such rights, powers and trusts referred to in the
first or second preceding paragraph, as the case may be.





                                        -45-
<PAGE>   55


         No successor Trustee shall accept its appointment unless at the time
of such acceptance such successor Trustee shall be qualified and eligible under
this Article.

SECTION 612.     MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS.

         Any corporation into which the Trustee may be merged or converted or
with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which the Trustee shall be a party, or
any corporation succeeding to all or substantially all the corporate trust
business of the Trustee, shall be the successor of the Trustee hereunder,
provided such corporation shall be otherwise qualified and eligible under this
Article, without the execution or filing of any paper or any further act on the
part of any of the parties hereto.  In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.

SECTION 613.     PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

         If and when the Trustee shall be or become a creditor of the Company
(or any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims
against the Company (or any such other obligor).

SECTION 614.     APPOINTMENT OF AUTHENTICATING AGENT.

         The Trustee may appoint an Authenticating Agent or Agents with respect
to one or more series of Securities which shall be authorized to act on behalf
of the Trustee to authenticate Securities of such series issued upon original
issue and upon exchange, registration of transfer or partial redemption thereof
or pursuant to Section 306, and Securities so authenticated shall be entitled
to the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder.  Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent.  Each Authenticating Agent shall be
acceptable to the Company and shall at all times be a corporation organized and
doing business under the laws of the United States of America, any State
thereof or the District of Columbia, authorized under such laws to act as
Authenticating Agent, having (or if the Authenticating Agent is a member of a
bank holding company system, its bank holding company has) a combined capital
and surplus of not less than $50,000,000 and subject to supervision or
examination by Federal or State authority.  If such Authenticating Agent
publishes reports of condition at least annually, pursuant to law or to the
requirements of said supervising or examining authority, then for the purposes
of this Section, the combined capital and surplus of such Authenticating Agent
shall be deemed to be its combined capital and surplus as set forth in its most
recent report of condition so published.  If at any time an Authenticating
Agent shall cease to be





                                        -46-
<PAGE>   56

eligible in accordance with the provisions of this Section, such Authenticating
Agent shall resign immediately in the manner and with the effect specified in
this Section.

         Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

         An Authenticating Agent may resign at any time by giving written
notice thereof to the Trustee and to the Company.  The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice
thereof to such Authenticating Agent and to the Company.  Upon receiving such a
notice of resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be acceptable to the Company and shall give notice of such
appointment in the manner provided in Section 106 to all Holders of Securities
of the series with respect to which such Authenticating Agent will serve.  Any
successor Authenticating Agent upon acceptance of its appointment hereunder
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.

         The Trustee agrees to pay to each Authenticating Agent from time to
time reasonable compensation for its services under this Section, and the
Trustee shall be entitled to be reimbursed for such payments, subject to the
provisions of Section 607.

         If an appointment with respect to one or more series is made pursuant
to this Section 612, the Securities of such series may have endorsed thereon,
in addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:





                                        -47-
<PAGE>   57

         This is one of the Securities of the series designated therein
referred to in the within-mentioned Indenture.


                                  LASALLE NATIONAL BANK
                                  As Trustee

                                  By:_______________________________________,
                                        As Authenticating Agent

                                  By:_______________________________________
                                        Authorized Officer


                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.     COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF HOLDERS.

         The Company will furnish or cause to be furnished to the Trustee

         (1)     semi-annually, not later than 15 days after the Regular Record
Date, a list, in such form as the Trustee may reasonably require, of the names
and addresses of the Holders of Securities of each series as of such Regular
Record Date, as the case may be, and

         (2)     at such other times as the Trustee may request in writing,
within 30 days after the receipt by the Company of any such request, a list of
similar form and content as of a date not more than 15 days prior to the time
such list is furnished;

provided that no such list need be furnished by the Company to the Trustee so
long as the Trustee is acting as Security Registrar.

SECTION 702.     PRESERVATION OF INFORMATION; COMMUNICATIONS TO HOLDERS.

         The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701, if any, and the names
and addresses of Holders received by the Trustee in its capacity as Security
Registrar.  The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.

         The rights of Holders to communicate with other Holders with respect
to their rights under this Indenture or under the Securities, and the
corresponding rights and privileges of the Trustee, shall be as provided by the
Trust Indenture Act.





                                        -48-
<PAGE>   58


         Every Holder of Securities, by receiving and holding the same, agrees
with the Company and the Trustee that neither the Company nor the Trustee nor
any agent of either of them shall be held accountable by reason of any
disclosure of information as to names and addresses of Holders made pursuant to
the Trust Indenture Act.

SECTION 703.     REPORTS BY TRUSTEE.

         The Trustee shall transmit to Holders such reports concerning the
Trustee and its actions under this Indenture as may be required pursuant to the
Trust Indenture Act at the times and in the manner provided pursuant thereto.

         Reports so required to be transmitted at stated intervals of not more
than 12 months shall be transmitted no later than July 1 in each calendar year,
commencing with the first July 1 after the first issuance of Securities
pursuant to this Indenture.

         A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Trustee with each stock exchange upon which any
Securities are listed, with the Commission and with the Company.  The Company
will notify the Trustee when any Securities are listed on any stock exchange.

SECTION 704.     REPORTS BY COMPANY.

         The Company shall file with the Trustee and the Commission, and
transmit to Holders, such information, documents and other reports, and such
summaries thereof, as may be required pursuant to the Trust Indenture Act at
the times and in the manner provided pursuant to the Trust Indenture Act;
provided that any such information, documents or reports required to be filed
with the Commission pursuant to Section 13 or 15(d) of the Exchange Act shall
be filed with the Trustee within 15 days after the same is so required to be
filed with the Commission.

                                 ARTICLE EIGHT

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.     COMPANY MAY CONSOLIDATE, ETC., ONLY ON CERTAIN TERMS.

         The Company shall not consolidate with or merge into any other Person
(in a transaction in which the Company is not the surviving corporation) or
convey, transfer or lease its properties and assets substantially as an
entirety to any Person, unless:

         (1)     in case the Company shall consolidate with or merge into
another Person (in an transaction in which the Company is not the surviving
corporation) or convey, transfer or lease its properties and assets
substantially as an entirety to any Person, the Person formed by such
consolidation or into which the Company is merged or the Person which acquires
by conveyance or transfer, or which leases, the properties and assets of the
Company substantially as an entirety shall





                                        -49-
<PAGE>   59

be a corporation, limited liability company, partnership or trust, shall be
organized and validly existing under the laws of the United States of America,
any State thereof or the District of Columbia and shall expressly assume, by an
indenture supplemental hereto, executed and delivered to the Trustee, in form
satisfactory to the Trustee, the due and punctual payment of the principal of
and any premium and interest on all the Securities and the performance or
observance of every covenant of this Indenture on the part of the Company to be
performed or observed and the conversion rights shall be provided for in
accordance with Article Fourteen, if applicable, or as otherwise specified
pursuant to Section 301, by supplemental indenture satisfactory in form to the
Trustee, executed and delivered to the Trustee, by the Person (if other than
the Company) formed by such consolidation or into which the Company shall have
been merged or by the Person which shall have acquired the Company's assets;

         (2)     immediately after giving effect to such transaction, no Event
of Default, and no event which, after notice or lapse of time or both, would
become an Event of Default, shall have happened and be continuing; and

         (3)     the Company has delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that such consolidation,
merger, conveyance, transfer or lease and, if a supplemental indenture is
required in connection with such transaction, such supplemental indenture
comply with this Article and that all conditions precedent herein provided for
relating to such transaction have been complied with.

SECTION 802.     SUCCESSOR SUBSTITUTED.

         Upon any consolidation of the Company with, or merger of the Company
into, any other Person or any conveyance, transfer or lease of the properties
and assets of the Company substantially as an entirety in accordance with
Section 801, the successor Person formed by such consolidation or into which
the Company is merged or to which such conveyance, transfer or lease is made
shall succeed to, and be substituted for, and may exercise every right and
power of, the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein, and thereafter, except
in the case of a lease, the predecessor Person shall be relieved of all
obligations and covenants under this Indenture and the Securities.

                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

SECTION 901.     SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS.

         Without the consent of any Holders, the Company, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more indentures supplemental hereto, in form satisfactory to the
Trustee, for any of the following purposes:





                                        -50-
<PAGE>   60

         (1)     to evidence the succession of another Person to the Company,
or successive successions, and the assumption by any such successor of the
covenants of the Company herein and in the Securities; or

         (2)     to add to the covenants of the Company for the benefit of the
Holders of all or any series of Securities (and if such covenants are to be for
the benefit of less than all series of Securities, stating that such covenants
are expressly being included solely for the benefit of such series) or to
surrender any right or power herein conferred upon the Company; or

         (3)     to add any additional Events of Default for the benefit of the
Holders of all or any series of Securities (and if such additional Events of
Default are to be for the benefit of less than all series of Securities,
stating that such additional Events of Default are expressly being included
solely for the benefit of such series); or

         (4)     to add to or change any of the provisions of this Indenture to
such extent as shall be necessary to permit or facilitate the issuance of
Securities in bearer form, registrable or not registrable as to principal, and
with or without interest coupons, or to permit or facilitate the issuance of
Securities in uncertificated form; or

         (5)     to add to, change or eliminate any of the provisions of this
Indenture in respect of one or more series of Securities, provided that any
such addition, change or elimination (A) shall neither (i) apply to any
Security of any series created prior to the execution of such supplemental
indenture and entitled to the benefit of such provision nor (ii) modify the
rights of the Holder of any such Security with respect to such provision or (B)
shall become effective only when there is no such Security Outstanding; or

         (6)     to secure the Securities; or

         (7)     to establish the form or terms of Securities of any series as
permitted by Sections 201 and 301; or

         (8)     to evidence and provide for the acceptance of appointment
hereunder by a successor Trustee with respect to the Securities of one or more
series and to add to or change any of the provisions of this Indenture as shall
be necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, pursuant to the requirements of Section
611; or

         (9)     to make provision with respect to the conversion rights of
Holders pursuant to the requirements of Article Fourteen, including providing
for the conversion of the securities into any security (other than the Common
Stock of the Company) or property of the Company; or

         (10)    to cure any ambiguity, to correct or supplement any provision
herein which may be defective or inconsistent with any other provision herein,
or to make any other provisions with respect to matters or questions arising
under this Indenture, provided that such action pursuant to this





                                        -51-
<PAGE>   61

Clause (10) shall not adversely affect the interests of the Holders of
Securities of any series in any material respect; or

         (11)    to supplement any of the provisions of the Indenture to such
extent as shall be necessary to permit or facilitate the defeasance and
discharge of any series of Securities pursuant to Articles Four and Thirteen,
provided that any such action shall not adversely affect the interests of the
Holders of Securities of such series or any other series of Securities in any
material respect.

SECTION 902.     SUPPLEMENTAL INDENTURES WITH CONSENT OF HOLDERS.

         With the consent of the Holders of a majority in principal amount of
the Outstanding Securities of each series affected by such supplemental
indenture, by Act of said Holders delivered to the Company and the Trustee, the
Company, when authorized by a Board Resolution, and the Trustee may enter into
an indenture or indentures supplemental hereto for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
this Indenture or of modifying in any manner the rights of the Holders of
Securities of such series under this Indenture; provided, however, that no such
supplemental indenture shall, without the consent of the Holder of each
Outstanding Security affected thereby,

         (1)     change the Stated Maturity of the principal of, or any
installment of principal of or interest on, any Security, or reduce the
principal amount thereof or the rate of interest thereon or any premium, or
reduce the amount of the principal of an Original Issue Discount Security or
any other Security which would be due and payable upon a declaration of
acceleration of the Maturity thereof pursuant to Section 502, or change any
Place of Payment where, or the coin or currency in which, the principal of any
Security or any premium or interest thereon is payable, or impair the right to
institute suit for the enforcement of any such payment on or after the Stated
Maturity thereof (or, in the case of redemption, on or after the Redemption
Date), or modify the provisions of this Indenture with respect to the
subordination of such series of Securities in a manner adverse to the Holders
of Securities of such series, or

         (2)     reduce the percentage in principal amount of the Outstanding
Securities of any series, the consent of whose Holders is required for any such
supplemental indenture, or the consent of whose Holders is required for any
waiver (of compliance with certain provisions of this Indenture or certain
defaults hereunder and their consequences) provided for in this Indenture, or

         (3)     modify any of the provisions of this Section, Section 513 or
Section 1008, except to increase any such percentage or to provide that certain
other provisions of this Indenture cannot be modified or waived without the
consent of the Holder of each Outstanding Security affected thereby; provided,
however, that this clause shall not be deemed to require the consent of any
Holder with respect to changes in the references to "the Trustee" and
concomitant changes in this Section and Section 1008, or the deletion of this
proviso, in accordance with the requirements of Sections 611 and 901(8), or





                                        -52-
<PAGE>   62

         (4)     if applicable, make any change that adversely affects the
right to convert any security as provided in Article Fourteen or pursuant to
Section 301 (except as permitted by Section 901(9)) or decrease the conversion
rate or increase the conversion price of any such security.

         A supplemental indenture which changes or eliminates any covenant or
other provision of this Indenture which has expressly been included solely for
the benefit of one or more particular series of Securities, or which modifies
the rights of the Holders of Securities of such series with respect to such
covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

         It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it
shall be sufficient if such Act shall approve the substance thereof.

SECTION 903.     EXECUTION OF SUPPLEMENTAL INDENTURES.

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive, and (subject to Sections 601 and 603) shall be fully protected in
relying upon, an Opinion of Counsel stating that the execution of such
supplemental indenture is authorized or permitted by this Indenture.  The
Trustee may, but shall not be obligated to, enter into any such supplemental
indenture which affects the Trustee's own rights, duties or immunities under
this Indenture or otherwise.

SECTION 904.     EFFECT OF SUPPLEMENTAL INDENTURES.

         Upon the execution of any supplemental indenture under this Article,
this Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every
Holder of Securities theretofore or thereafter authenticated and delivered
hereunder shall be bound thereby.

SECTION 905.     CONFORMITY WITH TRUST INDENTURE ACT.

         Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act.

SECTION 906.     REFERENCE IN SECURITIES TO SUPPLEMENTAL INDENTURES.

         Securities of any series authenticated and delivered after the
execution of any supplemental indenture pursuant to this Article may, and shall
if required by the Trustee, bear a notation in form approved by the Trustee as
to any matter provided for in such supplemental indenture.  If the Company
shall so determine, new Securities of any series so modified as to conform, in
the opinion of the Trustee and the Company, to any such supplemental indenture
may be prepared and executed





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<PAGE>   63

by the Company and authenticated and delivered by the Trustee in exchange for
Outstanding Securities of such series.

SECTION 907.     SUBORDINATION UNIMPAIRED.

         No provision in any supplemental indenture which affects the superior
position of the holders of Senior Debt shall be effective against holders of
Senior Debt.

                                  ARTICLE TEN

                                   COVENANTS

SECTION 1001.    PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST.

         The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any
premium and interest on the Securities of that series in accordance with the
terms of the Securities and this Indenture.

SECTION 1002.    MAINTENANCE OF OFFICE OR AGENCY.

         The Company will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange, where Securities of that series may
be surrendered for conversion and where notices and demands to or upon the
Company in respect of the Securities of that series and this Indenture may be
served.  The Company will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency.  If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee as its agent
to receive all such presentations, surrenders, notices and demands.

         The Company may also from time to time designate one or more other
offices or agencies where the Securities of one or more series may be presented
or surrendered for any or all such purposes and may from time to time rescind
such designations; provided, however, that no such designation or rescission
shall in any manner relieve the Company of its obligation to maintain an office
or agency in each Place of Payment for Securities of any series for such
purposes.  The Company will give prompt written notice to the Trustee of any
such designation or rescission and of any change in the location of any such
other office or agency.

SECTION 1003.    MONEY FOR SECURITIES PAYMENTS TO BE HELD IN TRUST.

         If the Company shall at any time act as its own Paying Agent with
respect to any series of Securities, it will, on or before each due date of the
principal of or any premium or interest on any





                                        -54-
<PAGE>   64

of the Securities of that series, segregate and hold in trust for the benefit
of the Persons entitled thereto a sum sufficient to pay the principal and any
premium and interest so becoming due until such sums shall be paid to such
Persons or otherwise disposed of as herein provided and will promptly notify
the Trustee of its action or failure so to act.

         Whenever the Company shall have one or more Paying Agents for any
series of Securities, it will, on or prior to each due date of the principal of
or any premium or interest on any Securities of that series, deposit with a
Paying Agent a sum sufficient to pay such amount, such sum to be held as
provided by the Trust Indenture Act, and (unless such Paying Agent is the
Trustee) the Company will promptly notify the Trustee of its action or failure
so to act.

         The Company will cause each Paying Agent for any series of Securities
other than the Trustee to execute and deliver to the Trustee an instrument in
which such Paying Agent shall agree with the Trustee, subject to the provisions
of this Section, that such Paying Agent will (1) comply with the provisions of
the Trust Indenture Act applicable to it as a Paying Agent and (2) during the
continuance of any default by the Company (or any other obligor upon the
Securities of that series) in the making of any payment in respect of the
Securities of that series, upon the written request of the Trustee, forthwith
pay to the Trustee all sums held in trust by such Paying Agent for payment in
respect of the Securities of that series.

         The Company may at any time, for the purpose of obtaining the
satisfaction and discharge of this Indenture or for any other purpose, pay, or
by Company Order direct any Paying Agent to pay, to the Trustee all sums held
in trust by the Company or such Paying Agent, such sums to be held by the
Trustee upon the same trusts as those upon which such sums were held by the
Company or such Paying Agent; and, upon such payment by any Paying Agent to the
Trustee, such Paying Agent shall be released from all further liability with
respect to such money.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of or any premium or
interest on any Security of any series and remaining unclaimed for a period
ending on the earlier of the date that is ten Business Days prior to the date
such money would escheat to the State or two years after such principal,
premium or interest has become due and payable shall be paid to the Company on
Company Request, or (if then held by the Company) shall be discharged from such
trust; and the Holder of such Security shall thereafter, as an unsecured
general creditor, look only to the Company for payment thereof, and all
liability of the Trustee or such Paying Agent with respect to such trust money,
and all liability of the Company as trustee thereof, shall thereupon cease;
provided, however, that the Trustee or such Paying Agent, before being required
to make any such repayment, may at the expense of the Company cause to be
published once, in a newspaper published in the English language, customarily
published on each Business Day and of general circulation in each Place of
Payment, notice that such money remains unclaimed and that, after a date
specified therein, which shall not be less than 30 days from the date of such
publication, any unclaimed balance of such money then remaining will be repaid
to the Company.

SECTION 1004.    STATEMENT BY OFFICERS AS TO DEFAULT.





                                        -55-

<PAGE>   65


         The Company will deliver to the Trustee, within 120 days after the end
of each fiscal year of the Company ending after the date hereof, an Officers'
Certificate, stating whether or not to the best knowledge of the signers
thereof the Company is in default in the performance and observance of any of
the terms, provisions and conditions of this Indenture (without regard to any
period of grace or requirement of notice provided hereunder) and, if the
Company shall be in default, specifying all such defaults and the nature and
status thereof of which they may have knowledge.  The fiscal year of the
Company ends on March 31; and the Company will give the Trustee prompt written
notice of any change of its fiscal year.

SECTION 1005.    EXISTENCE.

         Subject to Article Eight, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its existence.

SECTION 1006.    MAINTENANCE OF PROPERTIES.

         The Company will cause all properties used or useful in the conduct of
its business to be maintained and kept in good condition, repair and working
order and supplied with all necessary equipment and will cause to be made all
necessary repairs, renewals, replacements, betterments and improvements
thereof, all as, and to the extent, in the judgment of the Company may be
necessary so that the business carried on in connection therewith may be
properly and advantageously conducted at all times; provided, however, that
nothing in this Section shall prevent the Company from discontinuing the
operation or maintenance of any of such properties if such discontinuance is,
in the judgment of the Company, desirable in the conduct of its business and
not disadvantageous in any material respect to the Holders.

SECTION 1007.    PAYMENT OF TAXES AND OTHER CLAIMS.

         The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (1) all taxes, assessments and
governmental charges levied or imposed upon the Company or upon the income,
profits or property of the Company, and (2) all lawful claims for labor,
materials and supplies which, if unpaid, might by law become a lien upon the
property of the Company; provided, however, that the Company shall not be
required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge or claim (i) whose amount, applicability or validity is
being contested in good faith by appropriate proceedings or (ii) if the failure
to pay or discharge would not have a material adverse effect on the assets,
business, operations, properties or condition (financial or otherwise) of the
Company and its Subsidiaries, taken as a whole.

SECTION 1008.    WAIVER OF CERTAIN COVENANTS.

         Except as otherwise specified as contemplated by Section 301 for
Securities of such series or in a supplemental indenture, the Company may, with
respect to the Securities of any series, omit in any particular instance to
comply with any term, provision or condition set forth in any covenant provided
pursuant to Section 301(19), 901(2), 901(7), 1006 or 1007 for the benefit of
the Holders





                                        -56-
<PAGE>   66

of such series if before the time for such compliance the Holders of at least
50% in principal amount of the Outstanding Securities of such series shall, by
Act of such Holders, either waive such compliance in such instance or generally
waive compliance with such term, provision or condition, but no such waiver
shall extend to or affect such term, provision or condition except to the
extent so expressly waived, and, until such waiver shall become effective, the
obligations of the Company and the duties of the Trustee in respect of any such
term, provision or condition shall remain in full force and effect.

                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

SECTION 1101.    APPLICABILITY OF ARTICLE.

         Securities of any series which are redeemable before their Stated
Maturity shall be redeemable in accordance with their terms and (except as
otherwise specified as contemplated by Section 301 for such Securities) in
accordance with this Article.

SECTION 1102.    ELECTION TO REDEEM; NOTICE TO TRUSTEE.

         The election of the Company to redeem any Securities shall be
evidenced by a Board Resolution or in another manner specified as contemplated
by Section 301 for such Securities.  In case of any redemption at the election
of the Company of less than all the Securities of any series (including any
such redemption affecting only a single Security), the Company shall, at least
45 days prior to the Redemption Date fixed by the Company (unless a shorter
notice shall be satisfactory to the Trustee), notify the Trustee of such
Redemption Date, of the principal amount of Securities of such series to be
redeemed and, if applicable, of the tenor of the Securities to be redeemed.  In
the case of any redemption of Securities prior to the expiration of any
restriction on such redemption provided in the terms of such Securities or
elsewhere in this Indenture, the Company shall furnish the Trustee with an
Officers' Certificate evidencing compliance with such restriction.

SECTION 1103.    SELECTION BY TRUSTEE OF SECURITIES TO BE REDEEMED.

         If less than all the Securities of any series are to be redeemed
(unless all the Securities of such series and of a specified tenor are to be
redeemed or unless such redemption affects only a single Security), the
particular Securities to be redeemed shall be selected not more than 45 days
prior to the Redemption Date by the Trustee, from the Outstanding Securities of
such series not previously called for redemption, by lot, or in the Trustee's
discretion, on a pro-rata basis, provided that the unredeemed portion of the
principal amount of any Security shall be in an authorized denomination (which
shall not be less than the minimum authorized denomination) for such Security.
If less than all the Securities of such series and of a specified tenor are to
be redeemed (unless such redemption affects only a single Security), the
particular Securities to be redeemed shall be selected not more than 45 days
prior to the Redemption Date by the Trustee, from the Outstanding Securities of
such





                                        -57-
<PAGE>   67

series and specified tenor not previously called for redemption in accordance
with the preceding sentence.

         If any Security selected for partial redemption is converted in part
before termination of the conversion right with respect to the portion of the
Security so selected, the converted portion of such Security shall be deemed
(so far as may be) to be the portion selected for redemption.  Securities which
have been converted during a selection of Securities to be redeemed shall be
treated by the Trustee as Outstanding for the purpose of such selection.

         The Trustee shall promptly notify the Company in writing of the
Securities selected for redemption as aforesaid and, in case of any Securities
selected for partial redemption as aforesaid, the principal amount thereof to
be redeemed.

         The provisions of the two preceding paragraphs shall not apply with
respect to any redemption affecting only a single Security, whether such
Security is to be redeemed in whole or in part.  In the case of any such
redemption in part, the unredeemed portion of the principal amount of the
Security shall be in an authorized denomination (which shall not be less than
the minimum authorized denomination) for such Security.

         For all purposes of this Indenture, unless the context otherwise
requires, all provisions relating to the redemption of Securities shall relate,
in the case of any Securities redeemed or to be redeemed only in part, to the
portion of the principal amount of such Securities which has been or is to be
redeemed.

SECTION 1104.    NOTICE OF REDEMPTION.

         Notice of redemption shall be given by first-class mail, postage
prepaid, mailed not less than 30 nor more than 60 days prior to the Redemption
Date, unless a shorter period is specified in the Securities to be redeemed, to
each Holder of Securities to be redeemed, at its address appearing in the
Security Register.

         All notices of redemption shall state:

         (1)     the Redemption Date,

         (2)     the Redemption Price (including accrued interest, if any),

         (3)     if less than all the Outstanding Securities of any series
consisting of more than a single Security are to be redeemed, the
identification (and, in the case of partial redemption of any such Securities,
the principal amounts) of the particular Securities to be redeemed and, if less
than all the Outstanding Securities of any series consisting of a single
Security are to be redeemed, the principal amount of the particular Security to
be redeemed,





                                        -58-
<PAGE>   68

         (4)     that on the Redemption Date the Redemption Price will become
due and payable upon each such Security to be redeemed and, if applicable, that
interest thereon will cease to accrue on and after said date,

         (5)     the place or places where each such Security is to be
surrendered for payment of the Redemption Price,

         (6)     if applicable, the conversion price, that the date on which
the right to convert the principal of the Securities or the portions thereof to
be redeemed will terminate will be the Redemption Date and the place or places
where such Securities may be surrendered for conversion, and

         (7)     that the redemption is for a sinking fund, if such is the
case.

         Notice of redemption of Securities to be redeemed at the election of
the Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company and shall be irrevocable.

SECTION 1105.    DEPOSIT OF REDEMPTION PRICE.

         On or prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date.

         If any Security called for redemption is converted, any money
deposited with the Trustee or with a Paying Agent or so segregated and held in
trust for the redemption of such Security shall (subject to the right of any
Holder of such Security to receive interest as provided in the last paragraph
of Section 307) be paid to the Company on Company Request, or if then held by
the Company, shall be discharged from such trust.

SECTION 1106.    SECURITIES PAYABLE ON REDEMPTION DATE.

         Notice of redemption having been given as aforesaid, the Securities so
to be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest.  Upon surrender of any
such Security for redemption in accordance with said notice, such Security
shall be paid by the Company at the Redemption Price, together with accrued
interest to the Redemption Date; provided, however, that, unless otherwise
specified as contemplated by Section 301, installments of interest whose Stated
Maturity is on or prior to the Redemption Date will be payable to the Holders
of such Securities, or one or more Predecessor Securities, registered as such
at the close of business on the relevant Record Dates according to their terms
and the provisions of Section 307.





                                        -59-
<PAGE>   69


         If any Security called for redemption shall not be so paid upon
surrender thereof for redemption, the principal and any premium shall, until
paid, bear interest from the Redemption Date at the rate prescribed therefor in
the Security.

SECTION 1107.    SECURITIES REDEEMED IN PART.

         Any Security which is to be redeemed only in part shall be surrendered
at a Place of Payment therefor (with, if the Company or the Trustee so
requires, due endorsement by, or a written instrument of transfer in form
satisfactory to the Company and the Trustee duly executed by, the Holder
thereof or its attorney duly authorized in writing), and the Company shall
execute, and the Trustee shall authenticate and deliver to the Holder of such
Security without service charge, a new Security or Securities of the same
series and of like tenor, of any authorized denomination as requested by such
Holder, in aggregate principal amount equal to and in exchange for the
unredeemed portion of the principal of the Security so surrendered.

                                 ARTICLE TWELVE

                                 SINKING FUNDS

SECTION 1201.    APPLICABILITY OF ARTICLE.

         The provisions of this Article shall be applicable to any sinking fund
for the retirement of Securities of any series except as otherwise specified as
contemplated by Section 301 for such Securities.

         The minimum amount of any sinking fund payment provided for by the
terms of any Securities is herein referred to as a "mandatory sinking fund
payment," and any payment in excess of such minimum amount provided for by the
terms of such Securities is herein referred to as an "optional sinking fund
payment." If provided for by the terms of any Securities, the cash amount of
any sinking fund payment may be subject to reduction as provided in Section
1202.  Each sinking fund payment shall be applied to the redemption of
Securities as provided for by the terms of such Securities.

SECTION 1202.    SATISFACTION OF SINKING FUND PAYMENTS WITH SECURITIES.

         The Company (1) may deliver Outstanding Securities of a series (other
than any previously called for redemption) and (2) may apply as a credit
Securities of a series which have been redeemed either at the election of the
Company pursuant to the terms of such Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, in each case in satisfaction of all or any part of any sinking fund
payment with respect to any Securities of such series required to be made
pursuant to the terms of such Securities as and to the extent provided for by
the terms of such Securities; provided that the Securities to be so credited
have not been previously so credited.  The Securities to be so credited shall
be received and credited for such purpose by the Trustee at the Redemption
Price, as specified in the Securities so to be redeemed, for





                                        -60-
<PAGE>   70

redemption through operation of the sinking fund and the amount of such sinking
fund payment shall be reduced accordingly.

SECTION 1203.    REDEMPTION OF SECURITIES FOR SINKING FUND.

         Not less than 60 days prior to each sinking fund payment date for any
Securities, the Company will deliver to the Trustee an Officers' Certificate
specifying the amount of the next ensuing sinking fund payment for such
Securities pursuant to the terms of such Securities, the portion thereof, if
any, which is to be satisfied by payment of cash and the portion thereof, if
any, which is to be satisfied by delivering and crediting Securities pursuant
to Section 1202 and will also deliver to the Trustee any Securities to be so
delivered.  Not less than 30 days prior to each such sinking fund payment date,
the Trustee shall select the Securities to be redeemed upon such sinking fund
payment date in the manner specified in Section 1103 and cause notice of the
redemption thereof to be given in the name of and at the expense of the Company
in the manner provided in Section 1104.  Such notice having been duly given,
the redemption of such Securities shall be made upon the terms and in the
manner stated in Sections 1106 and 1107.

                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.    COMPANY'S OPTION TO EFFECT DEFEASANCE OR COVENANT DEFEASANCE.

         The Company may elect, at its option at any time, to have Section 1302
or Section 1303 applied to any Securities or any series of Securities, as the
case may be, designated pursuant to Section 301 as being defeasible pursuant to
such Section 1302 or 1303, in accordance with any applicable requirements
provided pursuant to Section 301 and upon compliance with the conditions set
forth below in this Article.  Any such election shall be evidenced by a Board
Resolution or in another manner specified as contemplated by Section 301 for
such Securities.

SECTION 1302.    DEFEASANCE AND DISCHARGE.

         Upon the Company's exercise of its option (if any) to have this
Section applied to any Securities or any series of Securities, as the case may
be, the Company shall be deemed to have been discharged from its obligations,
and the provisions of Article Fifteen shall cease to be effective, with respect
to such Securities as provided in this Section on and after the date the
conditions set forth in Section 1304 are satisfied (hereinafter called
"Defeasance").  For this purpose, such Defeasance means that the Company shall
be deemed to have paid and discharged the entire indebtedness represented by
such Securities and to have satisfied all its other obligations under such
Securities and this Indenture insofar as such Securities are concerned (and the
Trustee, at the expense of the Company, shall execute proper instruments
acknowledging the same), subject to the following which shall survive until
otherwise terminated or discharged hereunder: (1) the rights of Holders of such
Securities to receive, solely from the trust fund described in Section 1304 and
as more fully set forth in such Section, payments in respect of the principal
of and any premium and interest on such





                                        -61-
<PAGE>   71

Securities when payments are due, (2) the Company's obligations with respect to
such Securities under Sections 304, 305, 306, 1002 and 1003, and, if
applicable, Article Fourteen, (3) the rights, powers, trusts, duties and
immunities of the Trustee hereunder and (4) this Article.  Subject to
compliance with this Article, the Company may exercise its option (if any) to
have this Section applied to any Securities notwithstanding the prior exercise
of its option (if any) to have Section 1303 applied to such Securities.

SECTION 1303.    COVENANT DEFEASANCE.

         Upon the Company's exercise of its option (if any) to have this
Section applied to any Securities or any series of Securities, as the case may
be, (1) the Company shall be released from its obligations under Sections 1006
through 1007, inclusive, and any covenants provided pursuant to Section
301(19), 901(2) or 901(7) for the benefit of the Holders of such Securities and
(2) the occurrence of any event specified in Sections 501(4) (with respect to
any of Sections 1006 through 1007, inclusive, and any such covenants provided
pursuant to Section 301(19), 901(2) or 901(7)), shall be deemed not to be or
result in an Event of Default, and (3) the provisions of Article Fifteen shall
cease to be effective, in each case with respect to such Securities as provided
in this Section on and after the date the conditions set forth in Section 1304
are satisfied (hereinafter called "Covenant Defeasance").  For this purpose,
such Covenant Defeasance means that, with respect to such Securities, the
Company may omit to comply with and shall have no liability in respect of any
term, condition or limitation set forth in any such specified Section (to the
extent so specified in the case of Section 501(4)) or Article Fifteen, whether
directly or indirectly by reason of any reference elsewhere herein to any such
Section or Article or by reason of any reference in any such Section or Article
to any other provision herein or in any other document, but the remainder of
this Indenture and such Securities shall be unaffected thereby.

SECTION 1304.    CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE.

         The following shall be the conditions to the application of Section
1302 or Section 1303 to any Securities or any series of Securities, as the case
may be:

         (1)     The Company shall irrevocably have deposited or caused to be
deposited with the Trustee (or another trustee which satisfies the requirements
contemplated by Section 609 and agrees to comply with the provisions of this
Article applicable to it) as trust funds in trust for the purpose of making the
following payments, specifically pledged as security for, and dedicated solely
to, the benefits of the Holders of such Securities, (A) money in an amount, or
(B) U.S. Government Obligations which through the scheduled payment of
principal and interest in respect thereof in accordance with their terms will
provide, not later than one day before the due date of any payment, money in an
amount, or (C) a combination thereof, in each case sufficient, in the opinion
of a nationally recognized firm of independent public accountants expressed in
a written certification thereof delivered to the Trustee, to pay and discharge,
and which shall be applied by the Trustee (or any such other qualifying
trustee) to pay and discharge, the principal of and any premium and interest on
such Securities on the respective Stated Maturities, in accordance with the
terms of this Indenture and such Securities.  As used herein, "U.S. Government
Obligation" means (x) any security which





                                        -62-
<PAGE>   72

is (i) a direct obligation of the United States of America for the payment of
which the full faith and credit of the United States of America is pledged or
(ii) an obligation of a Person controlled or supervised by and acting as an
agency or instrumentality of the United States of America the payment of which
is unconditionally guaranteed as a full faith and credit obligation by the
United States of America, which, in either case (i) or (ii), is not callable or
redeemable at the option of the issuer thereof, and (y) any depositary receipt
issued by a bank (as defined in Section 3(a)(2) of the Securities Act) as
custodian with respect to any U.S. Government Obligation which is specified in
Clause (x) above and held by such bank for the account of the holder of such
depositary receipt, or with respect to any specific payment of principal of or
interest on any U.S. Government Obligation which is so specified and held,
provided that (except as required by law) such custodian is not authorized to
make any deduction from the amount payable to the holder of such depositary
receipt from any amount received by the custodian in respect of the U.S.
Government Obligation or the specific payment of principal or interest
evidenced by such depositary receipt.

         (2)     In the event of an election to have Section 1302 apply to any
Securities or any series of Securities, as the case may be, the Company shall
have delivered to the Trustee an Opinion of Counsel stating that (A) the
Company has received from, or there has been published by, the Internal Revenue
Service a ruling or (B) since the date of this instrument, there has been a
change in the applicable Federal income tax law, in either case (A) or (B) to
the effect that, and based thereon such opinion shall confirm that, the Holders
of such Securities will not recognize gain or loss for Federal income tax
purposes as a result of the deposit, Defeasance and discharge to be effected
with respect to such Securities and will be subject to Federal income tax on
the same amount, in the same manner and at the same times as would be the case
if such deposit, Defeasance and discharge were not to occur.

         (3)     In the event of an election to have Section 1303 apply to any
Securities or any series of Securities, as the case may be, the Company shall
have delivered to the Trustee an Opinion of Counsel to the effect that the
Holders of such Securities will not recognize gain or loss for Federal income
tax purposes as a result of the deposit and Covenant Defeasance to be effected
with respect to such Securities and will be subject to Federal income tax on
the same amount, in the same manner and at the same times as would be the case
if such deposit and Covenant Defeasance were not to occur.

         (4)     The Company shall have delivered to the Trustee an Officers'
Certificate to the effect that neither such Securities nor any other Securities
of the same series, if then listed on any securities exchange, will be delisted
as a result of such deposit.

         (5)     No event which is, or after notice or lapse of time or both
would become, an Event of Default with respect to such Securities or any other
Securities shall have occurred and be continuing at the time of such deposit
or, with regard to any such event specified in Sections 501(5) and (6), at any
time on or prior to the 90th day after the date of such deposit (it being
understood that this condition shall not be deemed satisfied until after such
90th day).




                                        -63-
<PAGE>   73

         (6)     Such Defeasance or Covenant Defeasance shall not cause the
Trustee to have a conflicting interest within the meaning of the Trust
Indenture Act (assuming all Securities are in default within the meaning of
such Act).

         (7)     Such Defeasance or Covenant Defeasance shall not result in a
breach or violation of, or constitute a default under, any other agreement or
instrument to which the Company is a party or by which it is bound.

         (8)     Such Defeasance or Covenant Defeasance shall not result in the
trust arising from such deposit constituting an investment company within the
meaning of the Investment Company Act unless such trust shall be registered
under such Act or exempt from registration thereunder.

         (9)     At the time of such deposit, (A) no default in the payment of
any principal of or premium or interest on any Senior Debt shall have occurred
and be continuing, (B) no event of default with respect to any Senior Debt
shall have resulted in such Senior Debt becoming, and continuing to be, due and
payable prior to the date on which it would otherwise have become due and
payable (unless payment of such Senior Debt has been made or duly provided
for), and (C) no other event of default with respect to any Senior Debt shall
have occurred and be continuing permitting (after notice or lapse of time or
both) the holders of such Senior Debt (or a trustee on behalf of such holders)
to declare such Senior Debt due and payable prior to the date on which it would
otherwise have become due and payable.

         (10)    The Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent with respect to such Defeasance or Covenant Defeasance have been
complied with.

SECTION 1305.    DEPOSITED MONEY AND U.S. GOVERNMENT OBLIGATIONS TO BE HELD IN
                 TRUST; MISCELLANEOUS PROVISIONS.

         Subject to the provisions of the last paragraph of Section 1003, all
money and U.S. Government Obligations (including the proceeds thereof)
deposited with the Trustee or other qualifying trustee (solely for purposes of
this Section and Section 1306, the Trustee and any such other trustee are
referred to collectively as the "Trustee") pursuant to Section 1304 in respect
of any Securities shall be held in trust and applied by the Trustee, in
accordance with the provisions of such Securities and this Indenture, to the
payment, either directly or through any such Paying Agent (including the
Company acting as its own Paying Agent) as the Trustee may determine, to the
Holders of such Securities, of all sums due and to become due thereon in
respect of principal and any premium and interest, but money so held in trust
need not be segregated from other funds except to the extent required by law.
Money and U.S. Government Obligations so held in trust shall not be subject to
the provisions of Article Fifteen.

         The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304





                                        -64-
<PAGE>   74

or the principal and interest received in respect thereof other than any such
tax, fee or other charge which by law is for the account of the Holders of
Outstanding Securities.

         Anything in this Article to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon Company Request any
money or U.S. Government Obligations held by it as provided in Section 1304
with respect to any Securities which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee, are in excess of the amount thereof which
would then be required to be deposited to effect the Defeasance or Covenant
Defeasance, as the case may be, with respect to such Securities.

SECTION 1306.    REINSTATEMENT.

         If the Trustee or the Paying Agent is unable to apply any money in
accordance with this Article with respect to any Securities by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the obligations under this
Indenture and such Securities from which the Company has been discharged or
released pursuant to Section 1302 or 1303 shall be revived and reinstated as
though no deposit had occurred pursuant to this Article with respect to such
Securities, until such time as the Trustee or Paying Agent is permitted to
apply all money held in trust pursuant to Section 1305 with respect to such
Securities in accordance with this Article; provided, however, that if the
Company makes any payment of principal of or any premium or interest on any
such Security following such reinstatement of its obligations, the Company
shall be subrogated to the rights (if any) of the Holders of such Securities to
receive such payment from the money so held in trust.

                                ARTICLE FOURTEEN

                            CONVERSION OF SECURITIES

SECTION 1401.    APPLICABILITY OF ARTICLE.

         The provisions of this Article shall be applicable to the Securities
of any series which are convertible into shares of Common Stock of the Company,
and the issuance of such shares of Common Stock upon the conversion of such
Securities, except as otherwise specified as contemplated by Section 301 for
the Securities of such series.

SECTION 1402.    EXERCISE OF CONVERSION PRIVILEGE.

         In order to exercise a conversion privilege, the Holder of a Security
of a series with such a privilege shall surrender such Security to the Company
at the office or agency maintained for that purpose pursuant to Section 1002,
accompanied by a duly executed conversion notice to the Company substantially
in the form set forth in Section 206 stating that the Holder elects to convert
such Security or a specified portion thereof.  Such notice shall also state, if
different from the name and address of such Holder, the name or names (with
address) in which the certificate or certificates for





                                        -65-
<PAGE>   75

shares of Common Stock which shall be issuable on such conversion shall be
issued.  Securities surrendered for conversion shall (if so required by the
Company or the Trustee) be duly endorsed by or accompanied by instruments of
transfer in forms satisfactory to the Company and the Trustee duly executed by
the registered Holder or its attorney duly authorized in writing; and
Securities so surrendered for conversion (in whole or in part) during the
period from the close of business on any Regular Record Date to the opening of
business on the next succeeding Interest Payment Date (excluding Securities or
portions thereof called for redemption during the period beginning at the close
of business on a Regular Record Date and ending at the opening of business on
the first Business Day after the next succeeding Interest Payment Date, or if
such Interest Payment Date is not a Business Day, the second such Business Day)
shall also be accompanied by payment in funds acceptable to the Company of an
amount equal to the interest payable on such Interest Payment Date on the
principal amount of such Security then being converted, and such interest shall
be payable to such registered Holder notwithstanding the conversion of such
Security, subject to the provisions of Section 307 relating to the payment of
Defaulted Interest by the Company.  As promptly as practicable after the
receipt of such notice and of any payment required pursuant to a Board
Resolution and, subject to Section 303, set forth, or determined in the manner
provided, in an Officers' Certificate, or established in one or more indentures
supplemental hereto setting forth the terms of such series of Security, and the
surrender of such Security in accordance with such reasonable regulations as
the Company may prescribe, the Company shall issue and shall deliver, at the
office or agency at which such Security is surrendered, to such Holder or on
its written order, a certificate or certificates for the number of full shares
of Common Stock issuable upon the conversion of such Security (or specified
portion thereof), in accordance with the provisions of such Board Resolution,
Officers' Certificate or supplemental indenture, and cash as provided therein
in respect of any fractional share of such Common Stock otherwise issuable upon
such conversion.  Such conversion shall be deemed to have been effected
immediately prior to the close of business on the date on which such notice and
such payment, if required, shall have been received in proper order for
conversion by the Company and such Security shall have been surrendered as
aforesaid (unless such Holder shall have so surrendered such Security and shall
have instructed the Company to effect the conversion on a particular date
following such surrender and such Holder shall be entitled to convert such
Security on such date, in which case such conversion shall be deemed to be
effected immediately prior to the close of business on such date) and at such
time the rights of the Holder of such Security as such Security Holder shall
cease and the person or persons in whose name or names any certificate or
certificates for shares of Common Stock of the Company shall be issuable upon
such conversion shall be deemed to have become the Holder or Holders of record
of the shares represented thereby.  Except as set forth above and subject to
the final paragraph of Section 307, no payment or adjustment shall be made upon
any conversion on account of any interest accrued on the Securities (or any
part thereof) surrendered for conversion or on account of any dividends on the
Common Stock of the Company issued upon such conversion.

         In the case of any Security which is converted in part only, upon such
conversion the Company shall execute and the Trustee shall authenticate and
deliver to or on the order of the Holder thereof, at the expense of the
Company, a new Security or Securities of the same series, of authorized
denominations, in aggregate principal amount equal to the unconverted portion
of such Security.





                                        -66-

<PAGE>   76

SECTION 1403.    NO FRACTIONAL SHARES.

         No fractional share of Common Stock of the Company shall be issued
upon conversions of Securities of any series.  If more than one Security shall
be surrendered for conversion at one time by the same Holder, the number of
full shares which shall be issuable upon conversion shall be computed on the
basis of the aggregate principal amount of the Securities (or specified
portions thereof to the extent permitted hereby) so surrendered.  If, except
for the provisions of this Section 1403, any Holder of a Security or Securities
would be entitled to a fractional share of Common Stock of the Company upon the
conversion of such Security or Securities, or specified portions thereof, the
Company shall pay to such Holder an amount in cash equal to the current market
value of such fractional share computed, (i) if such Common Stock is listed or
admitted to unlisted trading privileges on a national securities exchange or
market, on the basis of the last reported sale price regular way on such
exchange or market on the last trading day prior to the date of conversion upon
which such a sale shall have been effected, or (ii) if such Common Stock is not
at the time so listed or admitted to unlisted trading privileges on a national
securities exchange or market, on the basis of the average of the bid and asked
prices of such Common Stock in the over-the-counter market, on the last trading
day prior to the date of conversion, as reported by the National Quotation
Bureau, Incorporated or similar organization if the National Quotation Bureau,
Incorporated is no longer reporting such information, or if not so available,
the fair market price as determined by the Board of Directors.  For purposes of
this Section, "trading day" shall mean each Monday, Tuesday, Wednesday,
Thursday and Friday other than any day on which the Common Stock is not traded
on the Nasdaq National Market, or if the Common Stock is not traded on the
Nasdaq National Market, on the principal exchange or market on which the Common
Stock is traded or quoted.

SECTION 1404.    ADJUSTMENT OF CONVERSION PRICE.

         The conversion price of Securities of any series that is convertible
into Common Stock of the Company shall be adjusted for any stock dividends,
stock splits, reclassifications, combinations or similar transactions in
accordance with the terms of the supplemental indenture or Board Resolutions
setting forth the terms of the Securities of such series.

         Whenever the conversion price is adjusted, the Company shall compute
the adjusted conversion price in accordance with terms of the applicable Board
Resolution or supplemental indenture and shall prepare an Officers' Certificate
setting forth the adjusted conversion price and showing in reasonable detail
the facts upon which such adjustment is based, and such certificate shall
forthwith be filed at each office or agency maintained for the purpose of
conversion of Securities pursuant to Section 1002 and, if different, with the
Trustee.  The Company shall forthwith cause a notice setting forth the adjusted
conversion price to be mailed, first class postage prepaid, to each Holder of
Securities of such series at its address appearing on the Security Register and
to any conversion agent other than the Trustee.





                                        -67-
<PAGE>   77

SECTION 1405.    NOTICE OF CERTAIN CORPORATE ACTIONS.

         In case:
         (1)     the Company shall declare a dividend (or any other
distribution) on its common stock payable otherwise than in cash out of its
retained earnings (other than a dividend for which approval of any shareholders
of the Company is required) that would require an adjustment pursuant to
Section 1404; or

         (2)     the Company shall authorize the granting to all or
substantially all of the holders of its common stock of rights, options or
warrants to subscribe for or purchase any shares of capital stock of any class
or of any other rights (other than any such grant for which approval of any
shareholders of the Company is required); or

         (3)     of any reclassification of the common stock of the Company
(other than a subdivision or combination of its outstanding shares of common
stock, or of any consolidation, merger or share exchange to which the Company
is a party and for which approval of any shareholders of the Company is
required), or of the sale of all or substantially all of the assets of the
Company; or

         (4)     of the voluntary or involuntary dissolution, liquidation or
winding up of the Company;

then the Company shall cause to be filed with the Trustee, and shall cause to
be mailed to all Holders at their last addresses as they shall appear in the
Security Register, at least 20 days (or 10 days in any case specified in Clause
(1) or (2) above) prior to the applicable record date hereinafter specified, a
notice stating (i) the date on which a record is to be taken for the purpose of
such dividend, distribution, rights, options or warrants, or, if a record is
not to be taken, the date as of which the holders of common stock of record to
be entitled to such dividend, distribution, rights, options or warrants are to
be determined, or (ii) the date on which such reclassification, consolidation,
merger, share exchange, sale, dissolution, liquidation or winding up is
expected to become effective, and the date as of which it is expected that
holders of common stock of record shall be entitled to exchange their shares of
common stock for securities, cash or other property deliverable upon such
reclassification, consolidation, merger, share exchange, sale, dissolution,
liquidation or winding up.  If at any time the Trustee shall not be the
conversion agent, a copy of such notice shall also forthwith be filed by the
Company with the Trustee.

SECTION 1406.    RESERVATION OF SHARES OF COMMON STOCK.

         The Company shall at all times reserve and keep available, free from
preemptive rights, out of its authorized but unissued Common Stock, for the
purpose of effecting the conversion of Securities, the full number of shares of
Common Stock of the Company then issuable upon the conversion of all
outstanding Securities of any series that has conversion rights.

SECTION 1407.    PAYMENT OF CERTAIN TAXES UPON CONVERSION.





                                        -68-
<PAGE>   78

         Except as provided in the next sentence, the Company will pay any and
all taxes that may be payable in respect of the issue or delivery of shares of
its Common Stock on conversion of Securities pursuant hereto.  The Company
shall not, however, be required to pay any tax which may be payable in respect
of any transfer involved in the issue and delivery of shares of its Common
Stock in a name other than that of the Holder of the Security or Securities to
be converted, and no such issue or delivery shall be made unless and until the
person requesting such issue has paid to the Company the amount of any such
tax, or has established, to the satisfaction of the Company, that such tax has
been paid.

SECTION 1408.    NONASSESSABILITY.

         The Company covenants that all shares of its Common Stock which may be
issued upon conversion of Securities will upon issue in accordance with the
terms hereof be duly and validly issued and fully paid and nonassessable.

SECTION 1409.    PROVISION IN CASE OF CONSOLIDATION, MERGER OR SALE OF ASSETS.

         In case of any consolidation or merger of the Company with or into any
other Person, any merger of another Person with or into the Company (other than
a merger which does not result in any reclassification, conversion, exchange or
cancellation of outstanding shares of Common Stock of the Company) or any
conveyance, sale, transfer or lease of all or substantially all of the assets
of the Company, the Person formed by such consolidation or resulting from such
merger or which acquires such assets, as the case may be, shall execute and
deliver to the Trustee a supplemental indenture providing that the Holder of
each Security of a series then Outstanding that is convertible into Common
Stock of the Company shall have the right thereafter (which right shall be the
exclusive conversion right thereafter available to said Holder), during the
period such Security shall be convertible, to convert such Security only into
the kind and amount of securities, cash and other property receivable upon such
consolidation, merger, conveyance, sale, transfer or lease by a holder of the
number of shares of Common Stock of the Company into which such Security might
have been converted immediately prior to such consolidation, merger,
conveyance, sale, transfer or lease, assuming such holder of Common Stock of
the Company (i) is not a Person with which the Company consolidated or merged
with or into or which merged into or with the Company or to which such
conveyance, sale, transfer or lease was made, as the case may be (a
"Constituent Person"), or an Affiliate of a Constituent Person and (ii) failed
to exercise his rights of election, if any, as to the kind or amount of
securities, cash and other property receivable upon such consolidation, merger,
conveyance, sale, transfer or lease (provided that if the kind or amount of
securities, cash and other property receivable upon such consolidation, merger,
conveyance, sale, transfer, or lease is not the same for each share of Common
Stock of the Company held immediately prior to such consolidation, merger,
conveyance, sale, transfer or lease by others than a Constituent Person or an
Affiliate thereof and in respect of which such rights of election shall not
have been exercised ("Non- electing Share"), then for the purpose of this
Section 1409 the kind and amount of securities, cash and other property
receivable upon such consolidation, merger, conveyance, sale, transfer or lease
by the holders of each Non-electing Share shall be deemed to be the kind and
amount so receivable per share by a plurality of the Non-electing Shares).
Such supplemental indenture shall provide for adjustments which, for





                                        -69-
<PAGE>   79

events subsequent to the effective date of such supplemental indenture, shall
be as nearly equivalent as may be practicable to the adjustments provided for
in this Article or in accordance with the terms of the supplemental indenture
or Board Resolutions setting forth the terms of such adjustments.  The above
provisions of this Section 1409 shall similarly apply to successive
consolidations, mergers, conveyances, sales, transfers or leases.  Notice of
the execution of such a supplemental indenture shall be given by the Company to
the Holder of each Security of a series that is convertible into Common Stock
of the Company as provided in Section 106 promptly upon such execution.

         Neither the Trustee nor any conversion agent, if any, shall be under
any responsibility to determine the correctness of any provisions contained in
any such supplemental indenture relating either to the kind or amount of shares
of stock or other securities or property or cash receivable by Holders of
Securities of a series convertible into Common Stock of the Company upon the
conversion of their Securities after any such consolidation, merger,
conveyance, transfer, sale or lease or to any such adjustment, but may accept
as conclusive evidence of the correctness of any such provisions, and shall be
protected in relying upon, an Opinion of Counsel with respect thereto, which
the Company shall cause to be furnished to the Trustee upon request.

SECTION 1410.    DUTIES OF TRUSTEE REGARDING CONVERSION.

         Neither the Trustee nor any conversion agent shall at any time be
under any duty or responsibility to any Holder of Securities of any series that
is convertible into Common Stock of the Company to determine whether any facts
exist which may require any adjustment of the conversion price, or with respect
to the nature or extent of any such adjustment when made, or with respect to
the method employed, whether herein or in any supplemental indenture, any
resolutions of the Board of Directors or written instrument executed by one or
more officers of the Company provided to be employed in making the same.
Neither the Trustee nor any conversion agent shall be accountable with respect
to the validity or value (or the kind or amount) of any shares of Common Stock
of the Company, or of any securities or property, which may at any time be
issued or delivered upon the conversion of any Securities and neither the
Trustee nor any conversion agent makes any representation with respect thereto.
Subject to the provisions of Section 601, neither the Trustee nor any
conversion agent shall be responsible for any failure of the Company to issue,
transfer or deliver any shares of its Common Stock or stock certificates or
other securities or property upon the surrender of any Security for the purpose
of conversion or to comply with any of the covenants of the Company contained
in this Article Fourteen or in the applicable supplemental indenture,
resolutions of the Board of Directors or written instrument executed by one or
more duly authorized officers of the Company.

SECTION 1411.    REPAYMENT OF CERTAIN FUNDS UPON CONVERSION.

         Any funds which at any time shall have been deposited by the Company
or on its behalf with the Trustee or any other paying agent for the purpose of
paying the principal of, and premium, if any, and interest, if any, on any of
the Securities (including, but not limited to, funds deposited for the sinking
fund referred to in Article Twelve hereof and funds deposited pursuant to
Article Thirteen hereof) and which shall not be required for such purposes
because of the conversion of such





                                        -70-
<PAGE>   80

Securities as provided in this Article Fourteen shall after such conversion be
repaid to the Company by the Trustee upon the Company's written request.

                                ARTICLE FIFTEEN

                          SUBORDINATION OF SECURITIES

SECTION 1501.    SECURITIES SUBORDINATE TO SENIOR DEBT.

         Except as otherwise provided in a supplemental indenture or pursuant
to Section 301, the Company covenants and agrees, and each Holder of a
Security, by its acceptance thereof, likewise covenants and agrees, that, to
the extent and in the manner hereinafter set forth in this Article, the
indebtedness represented by the Securities and the payment of the principal of
and any premium and interest on each and all of the Securities or on the
account of the purchase, redemption or other acquisition of the Securities or
constituting a sinking fund or defeasance payment by the Company to the Trustee
or any Paying Agent, as the case may be, in accordance with Article Twelve or
Article Thirteen, respectively, on the Securities are hereby expressly made
subordinate and subject in right of payment to the prior payment in full of all
Senior Debt.   Notwithstanding the foregoing, this Article Fifteen shall not
apply to the application of any amounts deposited with the Trustee or any
Paying Agent pursuant to any sinking fund requirement or defeasance which, at
the time such amounts were deposited with the Trustee or Paying Agent, as the
case may be, such deposits were not prohibited by the provisions of this
Article Fifteen ("Previous Payments").

         The expressions "prior payment in full," "payment in full" and "paid
in full" and any other similar term or phrase when used in this Article Fifteen
with respect to Senior Debt shall mean in the case of Senior Debt consisting of
contingent obligations in respect of letters of credit (or local guaranties, as
applicable), bankers' acceptances, interest rate protection agreements or
currency exchange or purchase agreements, the setting apart of cash or other
payment acceptable to holders of such Senior Debt sufficient to discharge such
portion of Senior Debt in an account for the exclusive benefit of the holders
thereof, in which account such holders shall be granted by the Company a first
priority perfected security interest, which first priority perfected security
interest shall have been retained by the holders of Senior Debt for a period of
time in excess of all applicable preference or other similar periods, if any,
under applicable bankruptcy, insolvency or creditors' rights laws.

SECTION 1502.    PAYMENT OVER OF PROCEEDS UPON DISSOLUTION, ETC.

         In the event of (a) any insolvency or bankruptcy case or proceeding,
or any receivership, liquidation, reorganization, debt restructuring or other
similar case or proceeding in connection therewith, relative to the Company or
to its creditors, as such, or to its assets, or (b) any liquidation,
dissolution or other winding up of the Company, whether voluntary or
involuntary and whether or not involving insolvency or bankruptcy, or (c) any
assignment for the benefit of creditors or any other marshaling of assets and
liabilities of the Company, then and in any such event the holders of Senior
Debt shall be entitled to receive payment in full of all amounts due or to
become due on or





                                        -71-
<PAGE>   81

in respect of all Senior Debt in cash or other payment satisfactory to the
holders of Senior Debt before the Holders of the Securities are entitled to
receive any payment on account of principal of or any premium or interest on
the Securities or on the account of the purchase, redemption or other
acquisition of Securities or constituting a sinking fund or defeasance payment
by the Company to the Trustee or the Paying Agent, as the case may be, in
accordance with Article Twelve or Article Thirteen, respectively, on the
Securities (other than Previous Payments), and to that end the holders of
Senior Debt or their representative or representatives or the trustee or
trustees under any indenture under which any instruments evidencing any of such
Senior Debt may have been issued shall be entitled to receive, for application
to the payment thereof, any payment or distribution of any kind or character,
whether in cash, property or securities, which may be payable or deliverable in
respect of the Securities in any such case, proceeding, dissolution,
liquidation or other winding up or event, to the extent necessary to pay all
Senior Debt in full in cash or other payment satisfactory to the holders of
Senior Debt, after giving effect to any concurrent payment or distribution to
or for the holders of other Senior Debt.

         In the event that, notwithstanding the foregoing provisions of this
Section, the Trustee or the Holder of any Security shall have received any
payment or distribution of assets of the Company of any kind or character,
whether in cash, property or securities, before all Senior Debt is paid in full
in cash or other payment satisfactory to the holders of Senior Debt then, and
in such event such payment or distribution shall be paid over or delivered
forthwith to the trustee in bankruptcy, receiver, liquidating trustee,
custodian, assignee, agent or other Person making payment or distribution of
assets of the Company for application to the payment of all Senior Debt
remaining unpaid, to the extent necessary to pay all Senior Debt in full, after
giving effect to any concurrent payment or distribution to or for the holders
of Senior Debt.

         For purposes of this Article only, the words "cash, property or
securities" shall not be deemed to include shares of stock of the Company as
reorganized or readjusted, or securities of the Company or any other
corporation provided for by a plan of reorganization or readjustment which are
subordinated in right of payment to all Senior Debt which may at the time be
outstanding to substantially the same extent as, or to a greater extent than,
the Securities are so subordinated as provided in this Article.  The
consolidation of the Company with, or the merger of the Company into, another
Person or the liquidation or dissolution of the Company following the
conveyance or transfer of its properties and assets substantially as an
entirety to another Person upon the terms and conditions set forth in Article
Eight shall not be deemed a dissolution, winding up, liquidation,
reorganization, assignment for the benefit of creditors or marshaling of assets
and liabilities of the Company for the purposes of this Section if the Person
formed by such consolidation or into which the Company is merged or which
acquires by conveyance or transfer such properties and assets substantially as
an entirety, as the case may be, shall, as a part of such consolidation,
merger, conveyance or transfer, comply with the conditions set forth in Article
Eight.

SECTION 1503.    PRIOR PAYMENT TO SENIOR DEBT UPON ACCELERATION OF SECURITIES.

         In the event that any Securities are declared due and payable before
their Stated Maturity, then and in such event the holders of the Senior Debt
outstanding at the time such Securities so





                                        -72-
<PAGE>   82

become due and payable shall be entitled to receive payment in full in cash or
other payment satisfactory to the holders of Senior Debt of all amounts due or
to become due on or in respect of all Senior Debt before the Holders of the
Securities are entitled to receive any payment by the Company on account of the
principal of or any premium or interest on the Securities or on account of the
purchase, redemption or other acquisition of Securities or constituting a
sinking fund or defeasance payment by the Company to the Trustee or the Paying
Agent, as the case may be, in accordance with Article Twelve or Article
Thirteen, respectively, on the Securities (other than Previous Payments);
provided, however, that nothing in this Section shall prevent the satisfaction
of any sinking fund payment in accordance with Article Twelve by delivering and
crediting pursuant to Section 1202 Securities which have been acquired (upon
redemption or otherwise) prior to such declaration of acceleration or which
have been converted pursuant to Article Fourteen; provided further that the
Holders of the Securities shall be entitled to receive payment on the
Securities to the extent such acceleration is rescinded in accordance with the
terms of this Indenture.  If the payment of Securities is accelerated because
of an Event of Default, the Company shall promptly notify holders of Senior
Debt of the acceleration.

         In the event that, notwithstanding the foregoing, the Company shall
make any payment to the Trustee or the Holder of any Security prohibited by the
foregoing provisions of this Section, and if such fact shall, at or prior to
the time of such payment, have been made known to the Trustee or, as the case
may be, such Holder, then and in such event such payment shall be paid over and
delivered forthwith to the Company.

         The provisions of this Section shall not apply to any payment with
respect to which Section 1502 would be applicable.

SECTION 1504.    NO PAYMENT IN CERTAIN CIRCUMSTANCES.

         The Company may not make any payment of principal of, or premium, if
any, or interest on the Securities on or account of the purchase, redemption or
other acquisition of Securities or constituting a sinking fund or defeasance
payment by the Company to the Trustee or the Paying Agent, as the case may be,
in accordance with Article Twelve or Article Thirteen, respectively, on the
Securities (other than Previous Payments), if:

                    (i)   a default in the payment of principal, premium, if
         any, or interest (including a default under any redemption or
         repurchase obligation) or other amounts with respect to any Senior
         Debt occurs and is continuing (or, in the case of Senior Debt for
         which there is a period of grace, in the event of such a default that
         continues beyond the period of grace, if any, specified in the
         instrument or lease evidencing such Senior Debt) unless and until such
         default shall have been cured or waived or shall have ceased to exist;
         or

                    (ii)  a default, other than a payment default, on any
         Designated Senior Debt occurs and is continuing that then permits
         holders of such Designated Senior Debt to accelerate its maturity and
         the Trustee receives a notice of the default (a "Payment Blockage
         Notice") from





                                        -73-
<PAGE>   83

         the Company, a holder of such Designated Senior Debt or a
         Representative of such Designated Senior Debt

; provided, however, that nothing in this Section shall prevent the
satisfaction of any sinking fund payment in accordance with Article Twelve by
delivering and crediting pursuant to Section 1202 Securities which have been
acquired (upon redemption or otherwise) prior to such declaration of
acceleration or which have been converted pursuant to Article Fourteen.

         If the Trustee receives any Payment Blockage Notice pursuant to clause
(ii) above, no subsequent Payment Blockage Notice shall be effective for
purposes of this Section unless and until at least 365 days shall have elapsed
since the initial effectiveness of the immediately prior Payment Blockage
Notice and all scheduled payments of principal, premium, if any, and interest
on the Securities that have come due have been paid in cash.  No nonpayment
default that existed or was continuing on the date of delivery of any Payment
Blockage Notice to the Trustee (unless such default was waived, cured or
otherwise ceased to exist and thereafter subsequently reoccurred) shall be, or
be made, the basis for a subsequent Payment Blockage Notice.

         The Company may and shall resume payments on and distributions in
respect of the Securities and may purchase, redeem or otherwise acquire
Securities and may make a sinking fund or defeasance payment to the Trustee or
Paying Agent, as the case may be, in accordance with Article Twelve or Article
Thirteen, respectively, on the Securities, upon the earlier of:

         (1)     the date upon which the default is cured or waived or ceases
to exist, or

         (2)     in the case of a default referred to in clause (ii) above, 179
days pass after the Payment Blockage Notice is received,

unless this Article Fifteen otherwise prohibits the payment, distribution,
purchase, redemption, acquisition, sinking fund payment or defeasance payment
at the time of such payment, distribution, purchase, redemption, acquisition,
sinking fund payment or defeasance payment (including, without limitation, in
the case of a default referred to in clause (ii) above, as a result of a
payment default with respect to the applicable Senior Debt as a consequence of
the acceleration of the maturity thereof or otherwise).

         In the event that, notwithstanding the foregoing, the Company shall
make any payment to the Trustee or the Holder of any Security prohibited by the
foregoing provisions of this Section, and if such fact shall, at or prior to
the time of such payment, have been made known to the Trustee or, as the case
may be, such Holder, then and in such event such payment shall be paid over and
delivered forthwith to the Company.

         The provisions of this Section shall not apply to any payment with
respect to which Section 1502 would be applicable.

SECTION 1505.    PAYMENT PERMITTED IF NO DEFAULT.





                                        -74-
<PAGE>   84


         Nothing contained in this Article or elsewhere in this Indenture or in
any of the Securities shall prevent (a) the Company, at any time except during
the pendency of any case, proceeding, dissolution, liquidation or other winding
up, debt restructuring, assignment for the benefit of creditors or other
marshaling of assets and liabilities of the Company referred to in Section 1502
or under the conditions described in Section 1503 or 1504, from making payments
at any time of principal of and any premium or interest on the Securities or on
the account of the purchase, redemption or other acquisition of Securities, or
(b) the application by the Trustee of any money deposited with it hereunder to
the payment of or on account of the principal of and any premium or interest on
the Securities or on the account of the purchase, redemption or other
acquisition of Securities, or the retention of such payment by the Holders, if,
at the time of such application by the Trustee, it did not have knowledge that
such payment would have been prohibited by the provisions of this Article.

SECTION 1506.    SUBROGATION TO RIGHTS OF HOLDERS OF SENIOR DEBT.

         Subject to the payment in full of all Senior Debt, the Holders of the
Securities shall be subrogated to the rights of the holders of such Senior Debt
to receive payments and distributions of cash, property and securities
applicable to the Senior Debt until the principal of and any premium and
interest on the Securities shall be paid in full.  For purposes of such
subrogation, no payments or distributions to the holders of the Senior Debt of
any cash, property or securities to which the Holders of the Securities or the
Trustee would be entitled except for the provisions of this Article, and no
payments over pursuant to the provisions of this Article to the holders of
Senior Debt by Holders of the Securities or the Trustee, shall, as among the
Company, its creditors other than holders of Senior Debt and the Holders of the
Securities, be deemed to be a payment or distribution by the Company to or on
account of the Senior Debt.

SECTION 1507.    PROVISIONS SOLELY TO DEFINE RELATIVE RIGHTS.

         The provisions of this Article are and are intended solely for the
purpose of defining the relative rights of the Holders of the Securities on the
one hand and the holders of Senior Debt on the other hand.  Nothing contained
in this Article or elsewhere in this Indenture or in the Securities is intended
to or shall (a) impair, as among the Company, its creditors other than holders
of Senior Debt and the Holders of the Securities, the obligation of the
Company, which is absolute and unconditional (and which, subject to the rights
under this Article of the holders of Senior Debt, is intended to rank equally
with all other general obligations of the Company), to pay to the Holders of
the Securities the principal of and any premium and interest on the Securities
as and when the same shall become due and payable in accordance with their
terms; or (b) affect the relative rights against the Company of the Holders of
the Securities and creditors of the Company other than the holders of Senior
Debt; or (c) prevent the Trustee or the Holder of any Security from exercising
all remedies otherwise permitted by applicable law upon default under this
Indenture, subject to the rights, if any, under this Article of the holders of
Senior Debt to receive cash, property and securities otherwise payable or
deliverable to the Trustee or such Holder.

SECTION 1508.    TRUSTEE TO EFFECTUATE SUBORDINATION.





                                        -75-
<PAGE>   85

         Each Holder of a Security by its acceptance thereof authorizes and
directs the Trustee on its behalf to take such action as may be necessary or
appropriate to effectuate the subordination provided in this Article and
appoints the Trustee its attorney-in-fact for any and all such purposes.

SECTION 1509.    NO WAIVER OF SUBORDINATION PROVISIONS.

         No right of any present or future holder of any Senior Debt to enforce
subordination as herein provided shall at any time in any way be prejudiced or
impaired by any act or failure to act on the part of the Company or by any act
or failure to act, in good faith, by any such holder, or by any non-compliance
by the Company with the terms, provisions and covenants of this Indenture,
regardless of any knowledge thereof any such holder may have or be otherwise
charged with.

         Without in any way limiting the generality of the foregoing paragraph,
the holders of Senior Debt may, at any time and from time to time, without the
consent of or notice to the Trustee or the Holders of the Securities, without
incurring responsibility to the Holders of the Securities and without impairing
or releasing the subordination provided in this Article or the obligations
hereunder of the Holders of the Securities to the holders of Senior Debt, do
any one or more of the following: (i) change the manner, place or terms of
payment or extend the time of payment of, or renew or alter, Senior Debt, or
otherwise amend or supplement in any manner Senior Debt or any instrument
evidencing the same or any agreement under which Senior Debt is outstanding;
(ii) sell, exchange, release or otherwise dispose of any property pledged,
mortgaged or otherwise securing Senior Debt; (iii) release any Person liable in
any manner for the collection of Senior Debt; and (iv) exercise or refrain from
exercising any rights against the Company and any other Person.

SECTION 1510.    NOTICE TO TRUSTEE.

         The Company shall give prompt written notice to the Trustee of any
fact known to the Company which would prohibit the making of any payment to or
by the Trustee in respect of the Securities.  Notwithstanding the provisions of
this Article or any other provision of this Indenture, the Trustee shall not be
charged with knowledge of the existence of any facts which would prohibit the
making of any payment to or by the Trustee in respect of the Securities, unless
and until the Trustee shall have received written notice thereof from the
Company or a holder of Senior Debt or from any trustee or other Representative
therefor; and, prior to the receipt of any such written notice, the Trustee,
subject to the provisions of Section 601, shall be entitled in all respects to
assume that no such facts exist; provided, however, that if the Trustee shall
not have received the notice provided for in this Section at least two Business
Days prior to the date upon which by the terms hereof any money may become
payable for any purpose (including, without limitation, the payment of the
principal of and any premium or interest on any Security), then, anything
herein contained to the contrary notwithstanding, the Trustee shall have full
power and authority to receive such money and to apply the same to the purpose
for which such money was received and shall not be affected by any notice to
the contrary which may be received by it within two Business Days prior to such
date.

         Subject to the provisions of Section 601, the Trustee shall be
entitled to rely on the delivery to it of a written notice by a Person
representing himself to be a holder of Senior Debt (or a trustee





                                        -76-
<PAGE>   86

or other Representative therefor) to establish that such notice has been given
by a holder of Senior Debt (or a trustee or other Representative therefor).  In
the event that the Trustee determines in good faith that further evidence is
required with respect to the right of any Person as a holder of Senior Debt to
participate in any payment or distribution pursuant to this Article, the
Trustee may request such Person to furnish evidence to the reasonable
satisfaction of the Trustee as to the amount of Senior Debt held by such
Person, the extent to which such Person is entitled to participate in such
payment or distribution and any other facts pertinent to the rights of such
Person under this Article, and if such evidence is not furnished, the Trustee
may defer any payment to such Person pending judicial determination as to the
right of such Person to receive such payment.

SECTION 1511.    RELIANCE ON JUDICIAL ORDER OR CERTIFICATE OF LIQUIDATING
                 AGENT.

         Upon any payment or distribution of assets of the Company referred to
in this Article, the Trustee, subject to the provisions of Section 601, and the
Holders of the Securities shall be entitled to rely upon any order or decree
entered by any court of competent jurisdiction in which such insolvency,
bankruptcy, receivership, liquidation, reorganization, dissolution, winding up
or similar case or proceeding is pending, or a certificate of the trustee in
bankruptcy, receiver, liquidating trustee, custodian, assignee for the benefit
of creditors, agent or other Person making such payment or distribution,
delivered to the Trustee or to the Holders of Securities, for the purpose of
ascertaining the Persons entitled to participate in such payment or
distribution, the holders of the Senior Debt and other indebtedness of the
Company, the amount thereof or payable thereon, the amount or amounts paid or
distributed thereon and all other facts pertinent thereto or to this Article.

SECTION 1512.    TRUSTEE NOT FIDUCIARY FOR HOLDERS OF SENIOR DEBT.

         The Trustee, in its capacity as trustee under this Indenture, shall
not be deemed to owe any fiduciary duty to the holders of Senior Debt and shall
not be liable to any such holders if it shall in good faith mistakenly pay over
or distribute to Holders of Securities or to the Company or to any other Person
cash, property or securities to which any holders of Senior Debt shall be
entitled by virtue of this Article or otherwise.

SECTION 1513.    RIGHTS OF TRUSTEE AS HOLDER OF SENIOR DEBT; PRESERVATION OF
                 TRUSTEE'S RIGHTS.

         The Trustee in its individual capacity shall be entitled to all the
rights set forth in this Article with respect to any Senior Debt which may at
any time be held by it, to the same extent as any other holder of Senior Debt,
and nothing in this Indenture shall deprive the Trustee of any of its rights as
such holder.

         Nothing in this Article shall apply to claims of, or payments to, the
Trustee under or pursuant to Section 607.

SECTION 1514.    ARTICLE APPLICABLE TO PAYING AGENTS.





                                        -77-
<PAGE>   87

         In case at any time any Paying Agent other than the Trustee shall have
been appointed by the Company and be then acting hereunder, the term "Trustee"
as used in this Article shall in such case (unless the context otherwise
requires) be construed as extending to and including such Paying Agent within
its meaning as fully for all intents and purposes as if such Paying Agent were
named in this Article in addition to or in place of the Trustee; provided,
however, that Section 1512 shall not apply to the Company or any Affiliate of
the Company if it or such Affiliate acts as Paying Agent.

SECTION 1515.    CERTAIN CONVERSIONS DEEMED PAYMENT.

         For the purposes of this Article only, (1) the issuance and delivery
of junior securities upon conversion of Securities in accordance with Article
Fourteen shall not be deemed to constitute a payment or distribution on account
of the principal of or any premium or interest on Securities or on account of
the purchase, redemption or other acquisition of Securities, and (2) the
payment, issuance or delivery of cash, property or securities (other than
junior securities and cash paid for fractional shares) upon conversion of a
Security shall be deemed to constitute payment on account of the principal of
such Security.  For the purposes of this Section, the term "junior securities"
means (a) shares of any stock of any class of the Company and (b) securities of
the Company which are subordinated in right of payment to all Senior Debt which
may be outstanding at the time of issuance or delivery of such securities to
substantially the same extent as, or to a greater extent than, the Securities
are so subordinated as provided in this Article.

SECTION 1516.    OBLIGATIONS OF COMPANY AND RIGHT TO CONVERT UNCONDITIONAL.

         Nothing contained in this Article or elsewhere in this Indenture or in
the Securities is intended to or shall impair, as among the Company, its
creditors other than holders of Senior Debt and the Holders of the Securities,
the obligation of the Company, which is absolute and unconditional, to pay to
the Holders of the Securities the principal of and any premium and interest on
the Securities as and when the same shall become due and payable in accordance
with their terms, or affect the relative rights of the Holders of the
Securities and creditors of the Company other than the holders of Senior Debt,
nor shall anything herein or therein prevent the Trustee or the Holder of any
Securities from exercising all remedies otherwise permitted by applicable law
upon default under this Indenture, subject to the rights, if any, under this
Article of the holders of Senior Debt in respect of cash, property or
securities of the Company received upon the exercise of any such remedy.

         Nothing contained in this Article or elsewhere in this Indenture or in
the Securities is intended to or shall impair, as among the Company, its
creditors other than holders of Senior Debt and the Holders of the Securities,
the right, which is absolute and unconditional, of the Holder of any Security
to convert such Security in accordance with Article Fourteen (if applicable).

SECTION 1517.    RELIANCE BY HOLDERS OF SENIOR INDEBTEDNESS ON SUBORDINATION
                 PROVISIONS.

         Each Holder by accepting a Security acknowledges and agrees that the
foregoing subordination provisions are, and are intended to be, an inducement
and a consideration to each holder of any Senior Debt, whether such Senior Debt
was created or acquired before or after the





                                        -78-
<PAGE>   88

issuance of the Securities, to acquire and continue to hold, or to continue to
hold, such Senior Debt and such holder of Senior Debt shall be deemed
conclusively to have relied on such subordination provisions in acquiring and
continuing to hold, or in continuing to hold, such Senior Debt, and no
amendment or modification of the provisions contained herein shall diminish the
rights of such holders of Senior Debt unless such holders shall have agreed in
writing hereto.





                                        -79-
<PAGE>   89

         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed all as of the day and year first above written.

                                        WESTELL TECHNOLOGIES, INC.


                                        By:____________________________________
                                           Name:
                                           Title:



                                        LASALLE NATIONAL BANK, as Trustee


                                        By:____________________________________
                                           Name:
                                           Title:



<PAGE>   1
                                                                     EXHIBIT 4.4




                           Westell Technologies, Inc.

                                       To

                             LaSalle National Bank


                                   as Trustee



                                   Indenture

                      Dated as of _________________, 1997





                             Senior Debt Securities


<PAGE>   2



                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                     PAGE
                                                                                                     ----
<S>                                                                                                   <C>
RECITALS OF THE COMPANY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
                                                                                                    
ARTICLE ONE  DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION  . . . . . . . . . . . . . . .   1
    SECTION 101.       Definitions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   1
            Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Affiliate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Attributable Debt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Authenticating Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Board of Directors  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Board Resolution  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
            Business Day  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Commission  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Common Stock  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Company Request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Company Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Consolidated Net Tangible Assets  . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Corporate Trust Office  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   3
            Covenant Defeasance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Defaulted Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Defeasance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Depositary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Event of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Exchange Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Expiration Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Global Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Holder  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            Indenture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
            interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Interest Payment Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Investment Company Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Maturity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Nonrecourse Obligation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Notice of Default . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Officers' Certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Opinion of Counsel  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Original Issue Discount Security  . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Outstanding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
            Paying Agent  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
            Person  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
            Place of Payment  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
            Predecessor Security  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   7
</TABLE>





                                      -ii-    
<PAGE>   3
                                              
                                              
                               TABLE OF CONTENTS
                                  (CONTINUED)  

<TABLE>                                         
<CAPTION>                                       
                                                                                                           PAGE
                                                                                                           ----
<S>                                                                                                         <C>
            Principal Property  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Record Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Redemption Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Redemption Price  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Regular Record Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Restricted Subsidiary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Sale and Leaseback Transaction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Securities  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
            Securities Act  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Security Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Security Registrar  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Special Record Date . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Stated Maturity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Subsidiary  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Trust Indenture Act . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Trustee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            U.S. Government Obligation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
            Vice President  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  8
    SECTION 102.       Compliance Certificates and Opinions   . . . . . . . . . . . . . . . . . . . . . . .  8
    SECTION 103.       Form of Documents Delivered to Trustee   . . . . . . . . . . . . . . . . . . . . . .  9
    SECTION 104.       Acts of Holders; Record Dates  . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
    SECTION 105.       Notices, Etc., to Trustee and Company  . . . . . . . . . . . . . . . . . . . . . . . 12
    SECTION 106.       Notice to Holders; Waiver  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
    SECTION 107.       Conflict with Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . . 12
    SECTION 108.       Effect of Headings and Table of Contents   . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 109.       Successors and Assigns   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 110.       Separability Clause  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 111.       Benefits of Indenture  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 112.       Governing Law  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 113.       Legal Holidays   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
    SECTION 114.       Indenture and Securities Solely Corporate Obligations  . . . . . . . . . . . . . . . 13
                                                                                                  
ARTICLE TWO  SECURITY FORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
    SECTION 201.       Forms Generally  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
    SECTION 202.       Form of Face of Security   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
    SECTION 203.       Form of Reverse of Security  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
    SECTION 204.       Form of Legend for Global Securities   . . . . . . . . . . . . . . . . . . . . . . . 21
    SECTION 205.       Form of Trustee's Certificate of Authentication  . . . . . . . . . . . . . . . . . . 21
    SECTION 206.       Form of Conversion Notice  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
</TABLE>                                        
                                                
                                                
                                                
                                     -iii-      
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                               TABLE OF CONTENTS 
                                  (CONTINUED)    
                                                 
<TABLE>    
<CAPTION>  
                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
ARTICLE THREE  THE SECURITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
    SECTION 301.       Amount Unlimited; Issuable in Series   . . . . . . . . . . . . . . . . . . . . . . . 23
    SECTION 302.       Denominations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
    SECTION 303.       Execution, Authentication, Delivery and Dating   . . . . . . . . . . . . . . . . . . 25
    SECTION 304.       Temporary Securities   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
    SECTION 305.       Registration; Registration of Transfer and Exchange  . . . . . . . . . . . . . . . . 27
    SECTION 306.       Mutilated, Destroyed, Lost and Stolen Securities   . . . . . . . . . . . . . . . . . 29
    SECTION 307.       Payment of Interest; Interest Rights Preserved   . . . . . . . . . . . . . . . . . . 30
    SECTION 308.       Persons Deemed Owners  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
    SECTION 309.       Cancellation   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
    SECTION 310.       Computation of Interest  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
                                                                                                  
ARTICLE FOUR  SATISFACTION AND DISCHARGE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
    SECTION 401.       Satisfaction and Discharge of Indenture  . . . . . . . . . . . . . . . . . . . . . . 32
    SECTION 402.       Application of Trust Money   . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
                                                                                                  
ARTICLE FIVE  REMEDIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
    SECTION 501.       Events of Default  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
    SECTION 502.       Acceleration of Maturity; Rescission and Annulment   . . . . . . . . . . . . . . . . 34
    SECTION 503.       Collection of Indebtedness and Suits for Enforcement by Trustee  . . . . . . . . . . 35
    SECTION 504.       Trustee May File Proofs of Claim   . . . . . . . . . . . . . . . . . . . . . . . . . 36
    SECTION 505.       Trustee May Enforce Claims Without Possession of Securities  . . . . . . . . . . . . 36
    SECTION 506.       Application of Money Collected   . . . . . . . . . . . . . . . . . . . . . . . . . . 37
    SECTION 507.       Limitation on Suits  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
    SECTION 508.       Unconditional Right of Holders to Receive Principal, Premium and           
                       Interest and to Convert  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
    SECTION 509.       Restoration of Rights and Remedies   . . . . . . . . . . . . . . . . . . . . . . . . 38
    SECTION 510.       Rights and Remedies Cumulative   . . . . . . . . . . . . . . . . . . . . . . . . . . 38
    SECTION 511.       Delay or Omission Not Waiver   . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
    SECTION 512.       Control by Holders   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
    SECTION 513.       Waiver of Past Defaults  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
    SECTION 514.       Undertaking for Costs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
    SECTION 515.       Waiver of Usury, Stay or Extension Laws  . . . . . . . . . . . . . . . . . . . . . . 39
                                                                                                  
ARTICLE SIX  THE TRUSTEE  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
    SECTION 601.       Certain Duties and Responsibilities  . . . . . . . . . . . . . . . . . . . . . . . . 40
    SECTION 602.       Notice of Defaults   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
    SECTION 603.       Certain Rights of Trustee  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
    SECTION 604.       Not Responsible for Recitals or Issuance of Securities   . . . . . . . . . . . . . . 41
    SECTION 605.       May Hold Securities and Act as Trustee Under Other Indentures  . . . . . . . . . . . 41
</TABLE>   
           
           
           
           
           
                                      -iv-      
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                               TABLE OF CONTENTS
                                  (CONTINUED)   

<TABLE>   
<CAPTION> 
                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
    SECTION 606.       Money Held in Trust  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
    SECTION 607.       Compensation and Reimbursement   . . . . . . . . . . . . . . . . . . . . . . . . . . 42
    SECTION 608.       Conflicting Interests  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
    SECTION 609.       Corporate Trustee Required; Eligibility  . . . . . . . . . . . . . . . . . . . . . . 43
    SECTION 610.       Resignation and Removal; Appointment of Successor  . . . . . . . . . . . . . . . . . 43
    SECTION 611.       Acceptance of Appointment by Successor   . . . . . . . . . . . . . . . . . . . . . . 44
    SECTION 612.       Merger, Conversion, Consolidation or Succession to Business  . . . . . . . . . . . . 45
    SECTION 613.       Preferential Collection of Claims Against Company  . . . . . . . . . . . . . . . . . 46
    SECTION 614.       Appointment of Authenticating Agent  . . . . . . . . . . . . . . . . . . . . . . . . 46
                                                                                                  
ARTICLE SEVEN   HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY . . . . . . . . . . . . . . . . . . . . . 47
    SECTION 701.       Company to Furnish Trustee Names and Addresses of Holders  . . . . . . . . . . . . . 47
    SECTION 702.       Preservation of Information; Communications to Holders   . . . . . . . . . . . . . . 48
    SECTION 703.       Reports by Trustee   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
    SECTION 704.       Reports by Company   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
                                                                                                  
ARTICLE EIGHT  CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE . . . . . . . . . . . . . . . . . . . . 49
    SECTION 801.       Company May Consolidate, Etc., Only on Certain Terms   . . . . . . . . . . . . . . . 49
    SECTION 802.       Successor Substituted  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
                                                                                                  
ARTICLE NINE  SUPPLEMENTAL INDENTURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
    SECTION 901.       Supplemental Indentures Without Consent of Holders   . . . . . . . . . . . . . . . . 50
    SECTION 902.       Supplemental Indentures With Consent of Holders  . . . . . . . . . . . . . . . . . . 51
    SECTION 903.       Execution of Supplemental Indentures   . . . . . . . . . . . . . . . . . . . . . . . 52
    SECTION 904.       Effect of Supplemental Indentures  . . . . . . . . . . . . . . . . . . . . . . . . . 52
    SECTION 905.       Conformity with Trust Indenture Act  . . . . . . . . . . . . . . . . . . . . . . . . 52
    SECTION 906.       Reference in Securities to Supplemental Indentures   . . . . . . . . . . . . . . . . 53
                                                                                                  
ARTICLE TEN  COVENANTS  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
    SECTION 1001.      Payment of Principal, Premium and Interest   . . . . . . . . . . . . . . . . . . . . 53
    SECTION 1002.      Maintenance of Office or Agency  . . . . . . . . . . . . . . . . . . . . . . . . . . 53
    SECTION 1003.      Money for Securities Payments to Be Held in Trust  . . . . . . . . . . . . . . . . . 54
    SECTION 1004.      Statement by Officers as to Default  . . . . . . . . . . . . . . . . . . . . . . . . 55
    SECTION 1005.      Existence  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
    SECTION 1006.      Maintenance of Properties  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
    SECTION 1007.      Payment of Taxes and Other Claims  . . . . . . . . . . . . . . . . . . . . . . . . . 55
    SECTION 1008.      Limitation on Liens  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
    SECTION 1009.      Limitations on Sale and Leaseback Transactions   . . . . . . . . . . . . . . . . . . 57
    SECTION 1010.      Waiver of Certain Covenants  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
</TABLE>  
          
          
          
          
          
                                      -v-   
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                               TABLE OF CONTENTS
                                  (CONTINUED)  
                                               
<TABLE> 
<CAPTION>
                                                                                                          PAGE
                                                                                                          ----
<S>                                                                                                         <C>
ARTICLE ELEVEN  REDEMPTION OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
    SECTION 1101.      Applicability of Article   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
    SECTION 1102.      Election to Redeem; Notice to Trustee  . . . . . . . . . . . . . . . . . . . . . . . 58
    SECTION 1103.      Selection by Trustee of Securities to Be Redeemed  . . . . . . . . . . . . . . . . . 59
    SECTION 1104.      Notice of Redemption   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
    SECTION 1105.      Deposit of Redemption Price  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
    SECTION 1106.      Securities Payable on Redemption Date  . . . . . . . . . . . . . . . . . . . . . . . 61
    SECTION 1107.      Securities Redeemed in Part  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
                                                                                                  
ARTICLE TWELVE  SINKING FUNDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
    SECTION 1201.      Applicability of Article   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
    SECTION 1202.      Satisfaction of Sinking Fund Payments with Securities  . . . . . . . . . . . . . . . 62
    SECTION 1203.      Redemption of Securities for Sinking Fund  . . . . . . . . . . . . . . . . . . . . . 62
                                                                                                  
ARTICLE THIRTEEN  DEFEASANCE AND COVENANT DEFEASANCE  . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
    SECTION 1301.      Company's Option to Effect Defeasance or Covenant Defeasance   . . . . . . . . . . . 62
    SECTION 1302.      Defeasance and Discharge   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
    SECTION 1303.      Covenant Defeasance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
    SECTION 1304.      Conditions to Defeasance or Covenant Defeasance  . . . . . . . . . . . . . . . . . . 63
    SECTION 1305.      Deposited Money and U.S. Government Obligations to Be Held                 
                          in Trust; Miscellaneous Provisions  . . . . . . . . . . . . . . . . . . . . . . . 65
    SECTION 1306.      Reinstatement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
                                                                                                  
ARTICLE FOURTEEN  CONVERSION OF SECURITIES  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
    SECTION 1401.      Applicability of Article   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
    SECTION 1402.      Exercise of Conversion Privilege   . . . . . . . . . . . . . . . . . . . . . . . . . 66
    SECTION 1403.      No Fractional Shares   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
    SECTION 1404.      Adjustment of Conversion Price   . . . . . . . . . . . . . . . . . . . . . . . . . . 68
    SECTION 1405.      Notice of Certain Corporate Actions  . . . . . . . . . . . . . . . . . . . . . . . . 68
    SECTION 1406.      Reservation of Shares of Common Stock  . . . . . . . . . . . . . . . . . . . . . . . 69
    SECTION 1407.      Payment of Certain Taxes Upon Conversion   . . . . . . . . . . . . . . . . . . . . . 69
    SECTION 1408.      Nonassessability   . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
    SECTION 1409.      Provision in Case of Consolidation, Merger or Sale of Assets   . . . . . . . . . . . 70
    SECTION 1410.      Duties of Trustee Regarding Conversion   . . . . . . . . . . . . . . . . . . . . . . 71
    SECTION 1411.      Repayment of Certain Funds Upon Conversion   . . . . . . . . . . . . . . . . . . . . 71
</TABLE> 

                           WESTELL TECHNOLOGIES, INC.

                 Certain Sections of this Indenture relating to
    Sections 310 through 318, inclusive, of the Trust Indenture Act of 1939:





                                      -vi-
<PAGE>   7


<TABLE>
<CAPTION>
                                  Trust Indenture                                             Indenture
                                    Act Section                                                Section
                                  ---------------                                            -----------
                                    <S>                                                      <C>

                                 Section 310 (a)(1)    . . . . . . . . . . . . . . . . . . . . 609
                                             (a)(2)    . . . . . . . . . . . . . . . . . . . . 609
                                             (a)(3)    . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (a)(4)    . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (b)       . . . . . . . . . . . . . . . . . . . . 608, 610
                                 Section 311 (a)       . . . . . . . . . . . . . . . . . . . . 613
                                             (b)       . . . . . . . . . . . . . . . . . . . . 613
                                 Section 312 (a)       . . . . . . . . . . . . . . . . . . . . 701, 702
                                             (b)       . . . . . . . . . . . . . . . . . . . . 702
                                             (c)       . . . . . . . . . . . . . . . . . . . . 702
                                 Section 313 (a)       . . . . . . . . . . . . . . . . . . . . 703
                                             (b)       . . . . . . . . . . . . . . . . . . . . 703
                                             (c)       . . . . . . . . . . . . . . . . . . . . 703
                                             (d)       . . . . . . . . . . . . . . . . . . . . 703
                                 Section 314 (a)       . . . . . . . . . . . . . . . . . . . . 704
                                             (a)(4)    . . . . . . . . . . . . . . . . . . . . 101, 1004
                                             (b)       . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (c)(1)    . . . . . . . . . . . . . . . . . . . . 102
                                             (c)(2)    . . . . . . . . . . . . . . . . . . . . 102
                                             (c)(3)    . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (d)       . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (e)       . . . . . . . . . . . . . . . . . . . . 102
                                 Section 315 (a)       . . . . . . . . . . . . . . . . . . . . 601
                                             (b)       . . . . . . . . . . . . . . . . . . . . 602
                                             (c)       . . . . . . . . . . . . . . . . . . . . 601
                                             (d)       . . . . . . . . . . . . . . . . . . . . 601
                                             (e)       . . . . . . . . . . . . . . . . . . . . 514
                                 Section 316 (a)       . . . . . . . . . . . . . . . . . . . . 101
                                             (a)(1)(A) . . . . . . . . . . . . . . . . . . . . 502, 512
                                             (a)(1)(B) . . . . . . . . . . . . . . . . . . . . 513
                                             (a)(2)    . . . . . . . . . . . . . . . . . . . . Not Applicable
                                             (b)       . . . . . . . . . . . . . . . . . . . . 508
                                             (c)       . . . . . . . . . . . . . . . . . . . . 104
                                 Section 317 (a)(1)    . . . . . . . . . . . . . . . . . . . . 503
                                             (a)(2)    . . . . . . . . . . . . . . . . . . . . 504
                                             (b)       . . . . . . . . . . . . . . . . . . . . 1003
                                 Section 318 (a)       . . . . . . . . . . . . . . . . . . . . 107
</TABLE>
NOTE:     This reconciliation and tie shall not, for any purpose, be deemed to
          be a part of the Indenture.





                                     -vii-
<PAGE>   8
                                                                EXHIBIT 4.4


     INDENTURE, dated as of ___________, 1997, between Westell Technologies,
Inc., a corporation duly organized and existing under the State of Delaware
(herein called the "Company"), having its principal executive office at 750 N.
Commons Drive, Aurora, Illinois  60504, and LaSalle National Bank, a national
banking association duly organized and existing under the laws of the United
States of America, as Trustee (herein called the "Trustee").

                            RECITALS OF THE COMPANY

     The Company has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of its unsecured
debentures, notes or other evidences of indebtedness (herein called the
"Securities"), to be issued in one or more series as provided in this
Indenture.

     All things necessary to make this Indenture a valid agreement of the
Company, in accordance with its terms, have been done.

                   NOW, THEREFORE, THIS INDENTURE WITNESSETH:

     For and in consideration of the premises and the purchase of the
Securities by the Holders thereof, it is mutually covenanted and agreed, for
the equal and proportionate benefit of all Holders of the Securities or of
series thereof appertaining, as follows:

                                  ARTICLE ONE

            DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION

SECTION 101.   DEFINITIONS.

     For all purposes of this Indenture, except as otherwise expressly provided
or unless the context otherwise requires:

     (1)  the terms defined in this Article have the meanings assigned to them
in this Article and include the plural as well as the singular;

     (2)  all other terms used herein which are defined in the Trust Indenture
Act, either directly or by reference therein, have the meanings assigned to
them therein;

     (3)  all accounting terms not otherwise defined herein have the meanings
assigned to them in accordance with generally accepted accounting principles,
and, except as otherwise herein expressly provided, the term "generally
accepted accounting principles" with respect to any computation required or
permitted hereunder shall mean such accounting principles as are generally
accepted at the date of such computation;

     (4)  unless the context otherwise requires, any reference to an "Article"
or a "Section" refers to an Article or a Section, as the case may be, of this
Indenture; and
<PAGE>   9

     (5)  the words "herein," "hereof" and "hereunder" and other words of
similar import refer to this Indenture as a whole and not to any particular
Article, Section or other subdivision.

     "Act," when used with respect to any Holder, has the meaning specified in
Section 104.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person.  For the purposes of this definition,
"control" when used with respect to any specified Person means the power to
direct the management and policies of such Person, directly or indirectly,
whether through the ownership of voting securities, by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

     "Attributable Debt" means, in respect of a Sale and Lease-Back Transaction
involving a Principal Property, at the time of determination, the lesser of:
(a) the fair value of such property (as determined in good faith by the Board
of Directors); or (b) the present value of the total net amount of rent
required to be paid under such lease during the remaining term thereof
(including any renewal term or period for which such lease has been extended),
discounted at the rate of interest set forth or implicit in the terms of such
lease or, if not practicable to determine such rate, the weighted average
interest rate per annum (in the case of Original Issue Discount Securities, the
imputed interest rate) borne by the Securities of each series outstanding
pursuant to this Indenture compounded semi-annually.  For purposes of the
foregoing definition, rent shall not include amounts required to be paid by the
lessee, whether or not designated as rent or additional rent, on account of or
contingent upon maintenance and repairs, insurance, taxes, assessments, water
rates and similar charges.  In the case of any lease which is terminable by the
lessee upon the payment of a penalty, such net amount shall be the lesser of
the net amount determined assuming termination upon the first date such lease
may be terminated (in which case the net amount shall also include the amount
of the penalty, but no rent shall be considered as required to be paid under
such lease subsequent to the first date upon which it may be so terminated) and
the net amount determined assuming no such termination.

     "Authenticating Agent" means any Person authorized by the Trustee pursuant
to Section 614 to act on behalf of the Trustee to authenticate Securities of
one or more series.

     "Board of Directors" means either the board of directors of the Company or
any duly authorized committee of that board empowered to act for it with
respect to this Indenture.

     "Board Resolution" means a copy of a resolution certified by the Secretary
or an Assistant Secretary of the Company to have been duly adopted by the Board
of Directors and to be in full force and effect on the date of such
certification, and delivered to the Trustee.

     "Business Day," when used with respect to any Place of Payment, means each
Monday, Tuesday, Wednesday, Thursday and Friday which is not a day on which
banking institutions in that Place of Payment are authorized or obligated by
law or executive order to close.





                                      -2-
<PAGE>   10

     "Commission" means the Securities and Exchange Commission, from time to
time constituted, created under the Exchange Act, or, if at any time after the
execution of this instrument such Commission is not existing and performing the
duties now assigned to it under the Trust Indenture Act, then the body
performing such duties at such time.

     "Common Stock" means the Class A Common Stock, $.01 par value per share,
of the Company authorized at the date of this instrument as originally
executed. Subject to the provisions of Section 1409, shares issuable on
conversion or repurchase of Securities shall include only shares of Common
Stock or shares of any class or classes of common stock resulting from any
reclassification or reclassifications thereof; provided, however, that if at
any time there shall be more than one such resulting class, the shares so
issuable on conversion of Securities shall include shares of all such classes,
and the shares of each such class then so issuable shall be substantially in
the proportion which the total number of shares of such class resulting from
all such reclassifications bears to the total number of shares of all such
classes resulting from all such reclassifications.

     "common stock" includes any stock of any class of capital stock which has
no preference in respect of dividends or of amounts payable in the event of any
voluntary or involuntary liquidation, dissolution or winding up of the issuer
thereof and which is not subject to redemption by the issuer thereof.

     "Company" means the corporation named as the "Company" in the first
paragraph of this instrument until a successor Person shall have become such
pursuant to the applicable provisions of this Indenture, and thereafter
"Company" shall mean such successor Person.

     "Company Request" or "Company Order" means a written request or order
signed in the name of the Company by its Chairman of the Board, its Vice
Chairman of the Board, its President or a Vice President, and by its principal
financial officer, its Treasurer, an Assistant Treasurer, its Secretary or an
Assistant Secretary, and delivered to the Trustee.

     "Consolidated Net Tangible Assets" means, as of the time of determination,
total assets (excluding applicable reserves) less: (a) total current
liabilities, except for (1) notes and loans payable, (2) current maturities of
long-term debt and (3) current maturities of obligations under capital leases;
and (b) certain intangible assets to the extent included in total assets; all
as set forth on the most recent consolidated balance sheet of the Company and
its consolidated subsidiaries and computed in accordance with generally
accepted accounting principles.

     "Corporate Trust Office" means the corporate trust office of the Trustee
at 135 South LaSalle Street, Chicago, Illinois  60674-9135, at which at any
particular time its corporate trust business shall be administered.

     "corporation" means a corporation, association, company, joint-stock
company or business trust.

     "Covenant Defeasance" has the meaning specified in Section 1303.





                                      -3-
<PAGE>   11


     "Defaulted Interest" has the meaning specified in Section 307.

     "Defeasance" has the meaning specified in Section 1302.

     "Depositary" means, with respect to Securities of any series issuable in
whole or in part in the form of one or more Global Securities, a clearing
agency registered under the Exchange Act that is designated to act as
Depositary for such Securities as contemplated by Section 301.

     "Event of Default" has the meaning specified in Section 501.

     "Exchange Act" means the Securities Exchange Act of 1934 and any statute
successor thereto, in each case as amended from time to time.

     "Expiration Date" has the meaning specified in Section 104.

     "Global Security" means a Security that evidences all or part of the
Securities of any series and bears the legend set forth in Section 204 (or such
legend as may be specified as contemplated by Section 301 for such Securities).

     "Holder" means a Person in whose name a Security is registered in the
Security Register.

     "Indenture" means this instrument as originally executed and as it may
from time to time be supplemented or amended by one or more indentures
supplemental hereto entered into pursuant to the applicable provisions hereof,
including, for all purposes of this instrument and any such supplemental
indenture, the provisions of the Trust Indenture Act that are deemed to be a
part of and govern this instrument and any such supplemental indenture,
respectively.  The term "Indenture" shall also include the terms of particular
series of Securities established as contemplated by Section 301; provided,
however, that if at any time more than one Person is acting as Trustee under
this Indenture due to the appointment of one or more separate Trustees for any
one or more separate series of Securities, "Indenture" shall mean, with respect
to such series of Securities for which any such Person is Trustee, this
instrument as originally executed or as it may from time to time be
supplemented or amended by one or more indentures supplemental hereto entered
into pursuant to the applicable provisions hereof and shall include the terms
of particular series of Securities for which such Person is Trustee established
as contemplated by Section 301, exclusive, however, of any provisions or terms
which relate solely to other series of Securities for which such Person is not
Trustee, regardless of when such terms or provisions were adopted, and
exclusive of any provisions or terms adopted by means of one or more indentures
supplemental hereto executed and delivered after such person had become such
Trustee, but to which such person, as such Trustee, was not a party; provided,
further that in the event that this Indenture is supplemented or amended by one
or more indentures supplemental hereto which are only applicable to certain
series of Securities, the term "Indenture" for a particular series of
Securities shall only include the supplemental indentures applicable thereto.

     "interest," when used with respect to an Original Issue Discount Security
which by its terms bears interest only after Maturity, means interest payable
after Maturity.





                                      -4-
<PAGE>   12


     "Interest Payment Date," when used with respect to any Security, means the
Stated Maturity of an instalment of interest on such Security.

     "Investment Company Act" means the Investment Company Act of 1940 and any
statute successor thereto, in each case as amended from time to time.

     "Maturity," when used with respect to any Security, means the date on
which the principal of such Security or an instalment of principal becomes due
and payable as therein or herein provided, whether at the Stated Maturity or by
declaration of acceleration, call for redemption or otherwise.

     "Nonrecourse Obligation" means indebtedness or other obligations
substantially related to (i) the acquisition of assets not previously owned by
the Company or any Restricted Subsidiary or (ii) the financing of a project
involving the development or expansion of properties of the Company or any
Restricted Subsidiary, as to which the obligee with respect to such
indebtedness or obligation has no recourse to the Company or any Restricted
Subsidiary or any assets of the Company or any Restricted Subsidiary other than
the assets which were acquired with the proceeds of such transaction or the
project financed with the proceeds of such transaction (and the proceeds
thereof).

     "Notice of Default" means a written notice of the kind specified in
Section 501(4).

     "Officers' Certificate" means a certificate signed by the Chairman of the
Board, a Vice Chairman of the Board, the President or a Vice President, and by
the principal financial officer, the Treasurer, an Assistant Treasurer, the
Secretary or an Assistant Secretary, of the Company, and delivered to the
Trustee.  One of the officers signing an Officers' Certificate given pursuant
to Section 1004 shall be the principal executive, financial or accounting
officer of the Company.

     "Opinion of Counsel" means a written opinion of counsel, who may be
counsel for, or an employee of, the Company, and who shall be reasonably
acceptable to the Trustee.

     "Original Issue Discount Security" means any Security which provides for
an amount less than the principal amount thereof to be due and payable upon a
declaration of acceleration of the Maturity thereof pursuant to Section 502.

     "Outstanding," when used with respect to Securities, means, as of the date
of determination, all Securities theretofore authenticated and delivered under
this Indenture, except:

     (1)  Securities theretofore canceled by the Trustee or delivered to the
Trustee for cancellation;

     (2)  Securities for whose payment or redemption money in the necessary
amount has been theretofore deposited with the Trustee or any Paying Agent
(other than the Company) in trust or set aside and segregated in trust by the
Company (if the Company shall act as its own Paying Agent) for the Holders of
such Securities; provided that, if such Securities are to be redeemed, notice
of such





                                      -5-
<PAGE>   13

redemption has been duly given pursuant to this Indenture or provision therefor
satisfactory to the Trustee has been made;

     (3)  Securities as to which Defeasance has been effected pursuant to
Section 1302; and

     (4)  Securities which have been paid pursuant to Section 306 or in
exchange for or in lieu of which other Securities have been authenticated and
delivered pursuant to this Indenture, other than any such Securities in respect
of which there shall have been presented to the Trustee proof satisfactory to
it that such Securities are held by a bona fide purchaser in whose hands such
Securities are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
principal amount of the Outstanding Securities have given, made or taken any
request, demand, authorization, direction, notice, consent, waiver or other
action hereunder as of any date, (A) the principal amount of an Original Issue
Discount Security which shall be deemed to be Outstanding shall be the amount
of the principal thereof which would be due and payable as of such date upon
acceleration of the Maturity thereof to such date pursuant to Section 502, (B)
if, as of such date, the principal amount payable at the Stated Maturity of a
Security is not determinable, the principal amount of such Security which shall
be deemed to be Outstanding shall be the amount as specified or determined as
contemplated by Section 301, (C) the principal amount of a Security denominated
in one or more foreign currencies or currency units which shall be deemed to be
Outstanding shall be the U.S. dollar equivalent, determined as of such date in
the manner provided as contemplated by Section 301, of the principal amount of
such Security (or, in the case of a Security described in Clause (A) or (B)
above, of the amount determined as provided in such Clause), and (D) Securities
owned by the Company or any other obligor upon the Securities or any Affiliate
of the Company or of such other obligor shall be disregarded and deemed not to
be Outstanding, except that, in determining whether the Trustee shall be
protected in relying upon any such request, demand, authorization, direction,
notice, consent, waiver or other action, only Securities which the Trustee
knows to be so owned shall be so disregarded.  Securities so owned which have
been pledged in good faith may be regarded as Outstanding if the pledgee
establishes to the satisfaction of the Trustee the pledgee's right so to act
with respect to such Securities and that the pledgee is not the Company or any
other obligor upon the Securities or any Affiliate of the Company or of such
other obligor.

     "Paying Agent" means any Person authorized by the Company to pay the
principal of or any premium or interest on any Securities on behalf of the
Company.

     "Person" means any individual, corporation, partnership, joint venture,
trust, unincorporated organization or government or any agency or political
subdivision thereof.

     "Place of Payment," when used with respect to the Securities of any
series, means the place or places where the principal of and any premium and
interest on the Securities of that series are payable as specified as
contemplated by Section 301.





                                      -6-
<PAGE>   14

     "Predecessor Security" of any particular Security means every previous
Security evidencing all or a portion of the same debt as that evidenced by such
particular Security; and, for the purposes of this definition, any Security
authenticated and delivered under Section 306 in exchange for or in lieu of a
mutilated, destroyed, lost or stolen Security shall be deemed to evidence the
same debt as the mutilated, destroyed, lost or stolen Security.

     "Principal Property" means the land, land improvements, buildings and
fixtures (to the extent they constitute real property interests (including any
leasehold interest therein)), constituting the principal corporate office or
any manufacturing facility (whether now owned or hereafter acquired) which: (a)
is owned by the Company or any Subsidiary; (b) is located within any of the
present 50 states of the United States (or the District of Columbia); (c) has
not been determined in good faith by t0he Board of Directors not to be
materially important to the total business conducted by the Company and its
Subsidiaries taken as a whole; and (d) has a book value on the date as of which
the determination is being made in excess of 1.0% of Consolidated Net Tangible
Assets of the Company as most recently determined on or prior to such date.

     "Record Date" means any Regular Record Date or Special Record Date.

     "Redemption Date," when used with respect to any Security to be redeemed,
means the date fixed for such redemption by or pursuant to this Indenture.

     "Redemption Price," when used with respect to any Security to be redeemed,
means the price at which it is to be redeemed pursuant to this Indenture.

     "Regular Record Date" for the interest payable on any Interest Payment
Date on the Securities of any series means the date specified for that purpose
as contemplated by Section 301.

     "Restricted Subsidiary" means any Subsidiary that owns any Principal
Property; provided, however, that the term "Restricted Subsidiary" shall not
include (a) any Subsidiary which is principally engaged in financing
receivables, or which is principally engaged in financing the Company's
operations outside the United States of America or (b) any Subsidiary less than
80% of the voting stock of which is owned, directly or indirectly, by the
Company or by one or more other Subsidiaries, or by the Company and one or more
other Subsidiaries if the Common Stock of such Subsidiary is traded on any
national securities exchange or quoted on the Nasdaq National Market or in the
over-the-counter market.

     "Sale and Leaseback Transaction" means any arrangement with any Person
providing for the leasing by the Company or any Restricted Subsidiary of any
Principal Property which property has been or is to be sold or transferred by
the Company or such Restricted Subsidiary to such Person.

     "Securities" has the meaning stated in the first recital of this Indenture
and more particularly means any Securities authenticated and delivered under
this Indenture.





                                      -7-
<PAGE>   15

     "Securities Act" means the Securities Act of 1933 and any statute
successor thereto, in each case as amended from time to time.

     "Security Register" and "Security Registrar" have the respective meanings
specified in Section 305.

     "Special Record Date" for the payment of any Defaulted Interest means a
date fixed by the Trustee pursuant to Section 307.

     "Stated Maturity," when used with respect to any Security or any
installment of principal thereof or interest thereon, means the date specified
in such Security as the fixed date on which the principal of such Security or
such instalment of principal or interest is due and payable.

     "Subsidiary" means any corporation of which at least a majority of the
outstanding voting stock of such corporation is at the time owned, directly or
indirectly, by the Company or by one or more other Subsidiaries, or by the
Company and one or more other Subsidiaries.  For the purposes of this
definition, "voting stock" means stock which ordinarily has voting power for
the election of directors, whether at all times or only so long as no senior
class of stock has such voting power by reason of any contingency.

     "Trust Indenture Act" means the Trust Indenture Act of 1939 as in force at
the date as of which this instrument was executed; provided, however, that in
the event the Trust Indenture Act of 1939 is amended after such date, "Trust
Indenture Act" means, to the extent required by any such amendment, the Trust
Indenture Act of 1939 as so amended.

     "Trustee" means the Person named as the "Trustee" in the first paragraph
of this instrument until a successor Trustee shall have become such pursuant to
the applicable provisions of this Indenture, and thereafter "Trustee" shall
mean or include each Person who is then a Trustee hereunder, and if at any time
there is more than one such Person, "Trustee" as used with respect to the
Securities of any series shall mean the Trustee with respect to Securities of
that series.

     "U.S. Government Obligation" has the meaning specified in Section 1304.

     "Vice President," when used with respect to the Company or the Trustee,
means any vice president, whether or not designated by a number or a word or
words added before or after the title "vice president."

SECTION 102.   COMPLIANCE CERTIFICATES AND OPINIONS.

     Upon any application or request by the Company to the Trustee to take any
action under any provision of this Indenture, the Company shall furnish to the
Trustee such certificates and opinions as may be required under the Trust
Indenture Act. Each such certificate or opinion shall be given in the form of
an Officers' Certificate, if to be given by an officer of the Company, or an
Opinion of





                                      -8-
<PAGE>   16

Counsel, if to be given by counsel, and shall comply with the requirements of
the Trust Indenture Act and any other requirements set forth in this Indenture.

     Every certificate or opinion with respect to compliance with a condition
or covenant provided for in this Indenture shall include,

     (1)  a statement that each individual signing such certificate or opinion
has read such covenant or condition and the definitions herein relating
thereto;

     (2)  a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based;

     (3)  a statement that, in the opinion of each such individual, he or she
has made such examination or investigation as is necessary to enable him or her
to express an informed opinion as to whether or not such covenant or condition
has been complied with; and

     (4)  a statement as to whether, in the opinion of each such individual,
such condition or covenant has been complied with.

SECTION 103.   FORM OF DOCUMENTS DELIVERED TO TRUSTEE.

     In any case where several matters are required to be certified by, or
covered by an opinion of, any specified Person, it is not necessary that all
such matters be certified by, or covered by the opinion of, only one such
Person, or that they be so certified or covered by only one document, but one
such Person may certify or give an opinion with respect to some matters and one
or more other such Persons as to other matters, and any such Person may certify
or give an opinion as to such matters in one or several documents.

     Any certificate or opinion of an officer of the Company may be based,
insofar as it relates to legal matters, upon a certificate or opinion of, or
representations by, counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the certificate or opinion or representations
with respect to the matters upon which his or her certificate or opinion is
based are erroneous.  Any such certificate or opinion of counsel may be based,
insofar as it relates to factual matters, upon a certificate or opinion of, or
representations by, an officer or officers of the Company stating that the
information with respect to such factual matters is in the possession of the
Company, unless such counsel knows, or in the exercise of reasonable care
should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated and
form one instrument.

SECTION 104.   ACTS OF HOLDERS; RECORD DATES.





                                      -9-
<PAGE>   17

     Any request, demand, authorization, direction, notice, consent, waiver or
other action provided or permitted by this Indenture to be given, made or taken
by Holders may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by agent duly
appointed in writing; and, except as herein otherwise expressly provided, such
action shall become effective when such instrument or instruments are delivered
to the Trustee and, where it is hereby expressly required, to the Company.  The
Trustee shall promptly deliver to the Company copies of all such instrument or
instruments and records delivered to the Trustee.  Such instrument or
instruments (and the action embodied therein and evidenced thereby) are herein
sometimes referred to as the "Act" of the Holders signing such instrument or
instruments.  Proof of execution of any such instrument or of a writing
appointing any such agent shall be sufficient for any purpose of this Indenture
and (subject to Section 601) conclusive in favor of the Trustee and the
Company, if made in the manner provided in this Section.

     The fact and date of the execution by any Person of any such instrument or
writing may be proved by the affidavit of a witness of such execution or by a
certificate of a notary public or other officer authorized by law to take
acknowledgments of deeds, certifying that the individual signing such
instrument or writing acknowledged to him or her the execution thereof.  Where
such execution is by a signer acting in a capacity other than his or her
individual capacity, such certificate or affidavit shall also constitute
sufficient proof of his or her authority.  The fact and date of the execution
of any such instrument or writing, or the authority of the Person executing the
same, may also be proved in any other manner which the Trustee deems
sufficient.

     The ownership of Securities shall be proved by the Security Register.

     Any request, demand, authorization, direction, notice, consent, waiver or
other Act of the Holder of any Security shall bind every future Holder of the
same Security and the Holder of every Security issued upon the registration of
transfer thereof or in exchange therefor or in lieu thereof in respect of
anything done, omitted or suffered to be done by the Trustee or the Company in
reliance thereon, whether or not notation of such action is made upon such
Security.

     The Company may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
give, make or take any request, demand, authorization, direction, vote, notice,
consent, waiver or other action provided or permitted by this Indenture to be
given, made or taken by Holders of Securities of such series, provided that the
Company may not set a record date for, and the provisions of this paragraph
shall not apply with respect to, the giving or making of any notice,
declaration, request or direction referred to in the next paragraph.  If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of the relevant series on such record date, and no other Holders,
shall be entitled to take the relevant action, whether or not such Holders
remain Holders after such record date; provided that no such action shall be
effective hereunder unless taken on or prior to the applicable Expiration Date
by Holders of the requisite principal amount of Outstanding Securities of such
series on such record date.  Nothing in this paragraph shall be construed to
prevent the Company from setting a new record date for any action for which a
record date has previously been set pursuant to this paragraph (whereupon the
record date previously set shall automatically and with no action by any Person
be





                                      -10-
<PAGE>   18

canceled and of no effect), and nothing in this paragraph shall be construed to
render ineffective any action taken by Holders of the requisite principal
amount of Outstanding Securities of the relevant series on the date such action
is taken.  Promptly after any record date is set pursuant to this paragraph,
the Company, at its own expense, shall cause notice of such record date, the
proposed action by Holders and the applicable Expiration Date to be given to
the Trustee in writing and to each Holder of Securities of the relevant series
in the manner set forth in Section 106.

     The Trustee may set any day as a record date for the purpose of
determining the Holders of Outstanding Securities of any series entitled to
join in the giving or making of (i) any Notice of Default, (ii) any declaration
of acceleration referred to in Section 502, (iii) any request to institute
proceedings referred to in Section 507(2) or (iv) any direction referred to in
Section 512, in each case with respect to Securities of such series.  If any
record date is set pursuant to this paragraph, the Holders of Outstanding
Securities of such series on such record date, and no other Holders, shall be
entitled to join in such notice, declaration, request or direction, whether or
not such Holders remain Holders after such record date; provided that no such
action shall be effective hereunder unless taken on or prior to the applicable
Expiration Date by Holders of the requisite principal amount of Outstanding
Securities of such series on such record date.  Nothing in this paragraph shall
be construed to prevent the Trustee from setting a new record date for any
action for which a record date has previously been set pursuant to this
paragraph (whereupon the record date previously set shall automatically and
with no action by any Person be canceled and of no effect), and nothing in this
paragraph shall be construed to render ineffective any action taken by Holders
of the requisite principal amount of Outstanding Securities of the relevant
series on the date such action is taken.  Promptly after any record date is set
pursuant to this paragraph, the Trustee, at the Company's expense, shall cause
notice of such record date, the proposed action by Holders and the applicable
Expiration Date to be given to the Company in writing and to each Holder of
Securities of the relevant series in the manner set forth in Section 106.

     With respect to any record date set pursuant to this Section, the party
hereto which sets such record dates may designate any day as the "Expiration
Date" and from time to time may change the Expiration Date to any earlier or
later day; provided that no such change shall be effective unless notice of the
proposed new Expiration Date is given to the other party hereto in writing, and
to each Holder of Securities of the relevant series in the manner set forth in
Section 106, on or prior to the existing Expiration Date.  If an Expiration
Date is not designated with respect to any record date set pursuant to this
Section, the party hereto which set such record date shall be deemed to have
initially designated the 180th day after such record date as the Expiration
Date with respect thereto, subject to its right to change the Expiration Date
as provided in this paragraph.  Notwithstanding the foregoing, no Expiration
Date shall be later than the 180th day after the applicable record date.

     Without limiting the foregoing, a Holder entitled hereunder to take any
action hereunder with regard to any particular Security may do so with regard
to all or any part of the principal amount of such Security or by one or more
duly appointed agents each of which may do so pursuant to such appointment with
regard to all or any part of such principal amount.

SECTION 105.   NOTICES, ETC., TO TRUSTEE AND COMPANY.





                                      -11-
<PAGE>   19


     Any request, demand, authorization, direction, notice, consent, waiver or
Act of Holders or other document provided or permitted by this Indenture to be
made upon, given or furnished to, or filed with,

     (1)  the Trustee by any Holder or by the Company shall be sufficient for
every purpose hereunder if made, given, furnished or filed in writing (or by
facsimile transmissions ((312) 904-2236), provided that oral confirmation of
receipt shall have been received) to or with the Trustee at its Corporate Trust
Office, Attention: Corporate Trust Department, or

     (2)  the Company by the Trustee or by any Holder shall be sufficient for
every purpose hereunder (unless otherwise herein expressly provided) if in
writing and mailed, first-class postage prepaid, to the Company addressed to it
at the address of its principal office specified in the first paragraph of this
instrument or at any other address previously furnished in writing to the
Trustee by the Company, Attention:  Chief Financial Officer.

SECTION 106.   NOTICE TO HOLDERS; WAIVER.

     Where this Indenture provides for notice to Holders of any event, such
notice shall be sufficiently given (unless otherwise herein expressly provided)
if in writing and mailed, first-class postage prepaid, to each Holder affected
by such event, at its address as it appears in the Security Register, not later
than the latest date (if any), and not earlier than the earliest date (if any),
prescribed for the giving of such notice.  In any case where notice to Holders
is given by mail, neither the failure to mail such notice, nor any defect in
any notice so mailed, to any particular Holder shall affect the sufficiency of
such notice with respect to other Holders.  Where this Indenture provides for
notice in any manner, such notice may be waived in writing by the Person
entitled to receive such notice, either before or after the event, and such
waiver shall be the equivalent of such notice.  Waivers of notice by Holders
shall be filed with the Trustee, but such filing shall not be a condition
precedent to the validity of any action taken in reliance upon such waiver.

     In case by reason of the suspension of regular mail service or by reason
of any other cause it shall be impracticable to give such notice by mail, then
such notification as shall be made with the approval of the Trustee shall
constitute a sufficient notification for every purpose hereunder.

SECTION 107.   CONFLICT WITH TRUST INDENTURE ACT.

     If any provision hereof limits, qualifies or conflicts with a provision of
the Trust Indenture Act which is required under such Act to be a part of and
govern this Indenture, the latter provision shall control.  If any provision of
this Indenture modifies or excludes any provision of the Trust Indenture Act
which may be so modified or excluded, the latter provision shall be deemed to
apply to this Indenture as so modified or to be excluded, as the case may be.

SECTION 108.   EFFECT OF HEADINGS AND TABLE OF CONTENTS.





                                      -12-
<PAGE>   20

     The Article and Section headings herein and the Table of Contents are for
convenience only and shall not affect the construction hereof.

SECTION 109.   SUCCESSORS AND ASSIGNS.

     All covenants and agreements in this Indenture by the Company shall bind
its successors and assigns, whether so expressed or not.

SECTION 110.   SEPARABILITY CLAUSE.

     In case any provision in this Indenture or in the Securities shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

SECTION 111.   BENEFITS OF INDENTURE.

     Nothing in this Indenture or in the Securities, express or implied, shall
give to any Person, other than the parties hereto and their successors
hereunder and the Holders, any benefit or any legal or equitable right, remedy
or claim under this Indenture.

SECTION 112.   GOVERNING LAW.

     THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

SECTION 113.   LEGAL HOLIDAYS.

     In any case where any Interest Payment Date, Redemption Date or Stated
Maturity of any Security or the last date on which a Holder has the right to
convert a Security at a particular conversion price shall not be a Business Day
at any Place of Payment, then (notwithstanding any other provision of this
Indenture or of the Securities (other than a provision of any Security which
specifically states that such provision shall apply in lieu of this Section))
payment of interest or principal (and premium, if any) or, if applicable to a
particular series of Securities, conversion need not be made at such Place of
Payment on such date, but may be made on the next succeeding Business Day at
such Place of Payment with the same force and effect as if made on the Interest
Payment Date or Redemption Date, at the Stated Maturity or on such last day for
conversion, as the case may be.

SECTION 114.   INDENTURE AND SECURITIES SOLELY CORPORATE OBLIGATIONS.

     No recourse for the payment of the principal of or premium, if any, or
interest on any Security, or for any claim based thereon or otherwise in
respect thereof, and no recourse under or upon any obligation, covenant or
agreement of the Company in this Indenture or in any supplemental indenture or
in any Security, or because any indebtedness represented thereby, shall be had
against





                                      -13-
<PAGE>   21

any incorporator, stockholder, employee, agent, officer, or director or
subsidiary, as such, past, present or future, of the Company or of any
successor corporation, either directly or through the Company or any successor
corporation, whether by virtue of any constitution, statute or rule of law, or
by the enforcement of any assessment or penalty or otherwise; it being
expressly understood that all such liability is hereby expressly waived and
released as a condition of, and as a consideration for, the execution of this
Indenture and the issue of the Securities.

                                  ARTICLE TWO

                                 SECURITY FORMS

SECTION 201.   FORMS GENERALLY.

     The Securities of each series shall be in substantially the form set forth
in this Article, or in such other form as shall be established by or pursuant
to a Board Resolution or in one or more indentures supplemental hereto, in each
case with such appropriate insertions, omissions, substitutions and other
variations as are required or permitted by this Indenture, and may have such
letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or Depositary therefor or as may, consistently herewith, be
determined by the officers executing such Securities, as evidenced by their
execution thereof.  If the form of Securities of any series is established by
action taken pursuant to a Board Resolution, a copy of an appropriate record of
such action shall be certified by the Secretary or an Assistant Secretary of
the Company and delivered to the Trustee at or prior to the delivery of the
Company Order contemplated by Section 303 for the authentication and delivery
of such Securities.  Any such Board Resolution or record of such action shall
have attached thereto a true and correct copy of the form of Security referred
to therein approved by or pursuant to such Board Resolution.

     The definitive Securities shall be printed, lithographed or engraved on
steel engraved borders or may be produced in any other manner, all as
determined by the officers executing such Securities, as evidenced by their
execution of such Securities.

SECTION 202.   FORM OF FACE OF SECURITY.

                           WESTELL TECHNOLOGIES, INC.             


No.  _________                                                    $_____________

     Westell Technologies, Inc., a corporation duly organized and existing
under the laws of Delaware (herein called the "Company," which term includes
any successor Person under the Indenture hereinafter referred to), for value
received, hereby promises to pay to ____________, or registered assigns, the
principal sum of _____________ Dollars on _____________________________ [IF THE
SECURITY IS TO BEAR INTEREST PRIOR TO MATURITY, INSERT





                                      -14-
<PAGE>   22

- -- , and to pay interest thereon from __________ or from the most recent
Interest Payment Date to which interest has been paid or duly provided for,
semi-annually on ___________ and __________ in each year, commencing
_________., at the rate of ___% per annum, until the principal hereof is paid
or made available for payment [IF APPLICABLE, INSERT -- , provided that any
principal and premium, and any such instalment of interest, which is overdue
shall bear interest at the rate of ___% per annum (to the extent that the
payment of such interest shall be legally enforceable), from the dates such
amounts are due until they are paid or made available for payment, and such
interest shall be payable on demand].   The interest so payable, and punctually
paid or duly provided for, on any Interest Payment Date will, as provided in
such Indenture, be paid to the Person in whose name this Security (or one or
more Predecessor Securities) is registered at the close of business on the
Regular Record Date for such interest, which shall be the ______ or ______
(whether or not a Business Day), as the case may be, next preceding such
Interest Payment Date.  Any such interest not so punctually paid or duly
provided for will forthwith cease to be payable to the Holder on such Regular
Record Date and may either be paid to the Person in whose name this Security
(or one or more Predecessor Securities) is registered at the close of business
on a Special Record Date for the payment of such Defaulted Interest to be fixed
by the Trustee, notice whereof shall be given to Holders of Securities of this
series not less than 10 days prior to such Special Record Date, or be paid at
any time in any other lawful manner not inconsistent with the requirements of
any securities exchange on which the Securities of this series may be listed,
and upon such notice as may be required by such exchange, all as more fully
provided in said Indenture].

     [IF THE SECURITY IS NOT TO BEAR INTEREST PRIOR TO MATURITY, INSERT -- The
principal of this Security shall not bear interest except in the case of a
default in payment of principal upon acceleration, upon redemption or at Stated
Maturity and in such case the overdue principal and any overdue premium shall
bear interest at the rate of ___% per annum (to the extent that the payment of
such interest shall be legally enforceable), from the dates such amounts are
due until they are paid or made available for payment.  Interest on any overdue
principal or premium shall be payable on demand.  [Any such interest on overdue
principal or premium which is not paid on demand shall bear interest at the
rate of ___% per annum (to the extent that the payment of such interest on
interest shall be legally enforceable), from the date of such demand until the
amount so demanded is paid or made available for payment.  Interest on any
overdue interest shall be payable on demand.]]

     Payment of the principal of (and premium, if any) and [IF APPLICABLE,
INSERT -- any such] interest on this Security will be made at the office or
agency of the Company maintained for that purpose in _______, in such coin or
currency of the United States of America as at the time of payment is legal
tender for payment of public and private debts [IF APPLICABLE, INSERT -- ;
provided, however, that at the option of the Company payment of interest may be
made by check mailed to the address of the Person entitled thereto as such
address shall appear in the Security Register].

     Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.





                                      -15-
<PAGE>   23

     Unless the certificate of authentication hereon has been executed by the
Trustee referred to on the reverse hereof by manual signature, this Security
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

     IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

Dated:
                                        WESTELL TECHNOLOGIES, INC.

                                        By:_____________________________________
                                            Title:
Attest:

____________________________________

SECTION 203.   FORM OF REVERSE OF SECURITY.

     This Security is one of a duly authorized issue of securities of the
Company (herein called the "Securities"), issued and to be issued in one or
more series under an Indenture, dated as of __________ (herein called the
"Indenture," which term shall have the meaning assigned to it in such
instrument), between the Company and LaSalle National Bank, as Trustee (herein
called the "Trustee," which term includes any successor trustee under the
Indenture), and reference is hereby made to the Indenture and all indentures
supplemental thereto for a statement of the respective rights, limitations of
rights, duties and immunities thereunder of the Company, the Trustee and the
Holders of the Securities and of the terms upon which the Securities are, and
are to be, authenticated and delivered.  This Security is one of the series
designated on the face hereof [IF APPLICABLE, INSERT -- , limited in aggregate
principal amount to $________].

     [IF APPLICABLE, INSERT -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, [IF APPLICABLE, INSERT
- -- (1) on __________ in any year commencing with the year ________ and ending
with the year ________ through operation of the sinking fund for this series at
a Redemption Price equal to 100% of the principal amount, and (2)] at any time
[IF APPLICABLE, INSERT -- on or after __________, 19__], as a whole or in part,
at the election of the Company, at the following Redemption Prices (expressed
as percentages of the principal amount): If redeemed [IF APPLICABLE, INSERT --
on or before __________, ___%, and if redeemed] during the 12-month period
beginning ____________ of the years indicated,

                        Redemption                               Redemption
        Year              Price                  Year               Price
     -------------------------------           -----------------------------   
        



                                      -16-
<PAGE>   24

and thereafter at a Redemption Price equal to ___% of the principal amount,
together in the case of any such redemption [IF APPLICABLE, INSERT -- (whether
through operation of the sinking fund or otherwise)] with accrued interest to
the Redemption Date, but interest installments whose Stated Maturity is on or
prior to such Redemption Date will be payable to the Holders of such
Securities, or one or more Predecessor Securities, of record at the close of
business on the relevant Record Dates referred to on the face hereof, all as
provided in the Indenture.]

     [IF APPLICABLE, INSERT -- The Securities of this series are subject to
redemption upon not less than 30 days' notice by mail, (1) on __________ in any
year commencing with the year _____ and ending with the year _____ through
operation of the sinking fund for this series at the Redemption Prices for
redemption through operation of the sinking fund (expressed as percentages of
the principal amount) set forth in the table below, and (2) at any time [IF
APPLICABLE, INSERT -- on or after __________], as a whole or in part, at the
election of the Company, at the Redemption Prices for redemption otherwise than
through operation of the sinking fund (expressed as percentages of the
principal amount) set forth in the table below: If redeemed during the 12-month
period beginning __________ of the years indicated,

                   REDEMPTION PRICE FOR              REDEMPTION PRICE FOR
                    REDEMPTION THROUGH               REDEMPTION OTHERWISE
                     OPERATION OF THE               THAN THROUGH OPERATION
    YEAR               SINKING FUND                  OF THE SINKING FUND
   ------        -------------------------         ------------------------



and thereafter at a Redemption Price equal to ____% of the principal amount,
together in the case of any such redemption (whether through operation of the
sinking fund or otherwise) with accrued interest to the Redemption Date, but
interest installments whose Stated Maturity is on or prior to such Redemption
Date will be payable to the Holders of such Securities, or one or more
Predecessor Securities, of record at the close of business on the relevant
Record Dates referred to on the face hereof, all as provided in the Indenture.]

     [IF APPLICABLE, INSERT -- Notwithstanding the foregoing, the Company may
not, prior to __________, redeem any Securities of this series as contemplated
by [IF APPLICABLE, INSERT -- Clause (2) of] the preceding paragraph as a part
of, or in anticipation of, any refunding operation by the application, directly
or indirectly, of moneys borrowed having an interest cost to the Company
(calculated in accordance with generally accepted financial practice) of less
than ___% per annum.]

     [IF APPLICABLE, INSERT -- The sinking fund for this series provides for
the redemption on __________ in each year beginning with the year ______ and
ending with the year ______ of [IF APPLICABLE, INSERT -- not less than $_______
("mandatory sinking fund") and not more than] $_______ aggregate principal
amount of Securities of this series.  Securities of this series acquired or
redeemed by the Company otherwise than through [IF APPLICABLE, INSERT --
mandatory] sinking fund payments may be credited against subsequent [if
applicable, insert -- mandatory] sinking fund payments otherwise required to be
made [IF APPLICABLE, INSERT -- , in the inverse order in which they become
due].]





                                      -17-
<PAGE>   25


     [IF THE SECURITY IS SUBJECT TO REDEMPTION OF ANY KIND, INSERT -- In the
event of redemption of this Security in part only, a new Security or Securities
of this series and of like tenor for the unredeemed portion hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.]

     [IF APPLICABLE, INSERT -- The Indenture contains provisions for defeasance
at any time of [the entire indebtedness of this Security] [or] [certain
restrictive covenants and Events of Default with respect to this Security] [,
in each case] upon compliance with certain conditions set forth in the
Indenture.]

     [IF THE SECURITY IS CONVERTIBLE INTO COMMON STOCK OF THE COMPANY, INSERT
- -- Subject to the provisions of the Indenture, the Holder of this Security is
entitled, at its option, at any time on or before [insert date] (except that,
in case this Security or any portion hereof shall be called for redemption,
such right shall terminate with respect to this Security or portion hereof, as
the case may be, so called for redemption at the close of business on the first
Business Day next preceding the date fixed for redemption as provided in the
Indenture unless the Company defaults in making the payment due upon
redemption), to convert the principal amount of this Security (or any portion
hereof which is $1,000 or an integral multiple thereof), into fully paid and
non-assessable shares (calculated as to each conversion to the nearest 1/100th
of a share) of the Common Stock of the Company, as said shares shall be
constituted at the date of conversion, at the conversion price of $______
principal amount of Securities for each share of Common Stock, or at the
adjusted conversion price in effect at the date of conversion determined as
provided in the Indenture, upon surrender of this Security, together with the
conversion notice hereon duly executed, to the Company at the designated office
or agency of the Company in __________, accompanied (if so required by the
Company) by instruments of transfer, in form satisfactory to the Company and to
the Trustee, duly executed by the Holder or by its duly authorized attorney in
writing.  Such surrender shall, if made during any period beginning at the
close of business on a Regular Record Date and ending at the opening of
business on the Interest Payment Date next following such Regular Record Date
(unless this Security or the portion being converted shall have been called for
redemption on a Redemption Date during the period beginning at the close of
business on a Regular Record Date and ending at the opening of business on the
first Business Day after the next succeeding Interest Payment Date, or if such
Interest Payment Date is not a Business Day, the second such Business Day),
also be accompanied by payment in funds acceptable to the Company of an amount
equal to the interest payable on such Interest Payment Date on the principal
amount of this Security then being converted.  Subject to the aforesaid
requirement for payment and, in the case of a conversion after the Regular
Record Date next preceding any Interest Payment Date and on or before such
Interest Payment Date, to the right of the Holder of this Security (or any
Predecessor Security) of record at such Regular Record Date to receive an
installment of interest (with certain exceptions provided in the Indenture), no
adjustment is to be made on conversion for interest accrued hereon or for
dividends on shares of Common Stock issued on conversion.  The Company is not
required to issue fractional shares upon any such conversion, but shall make
adjustment therefor in cash on the basis of the current market value of such
fractional interest as provided in the Indenture.  The conversion price is
subject to adjustment as provided in the Indenture.  In addition, the Indenture
provides that in case of certain consolidations or mergers to which the Company
is a party or the sale





                                      -18-
<PAGE>   26

of substantially all of the assets of the Company, the Indenture shall be
amended, without the consent of any Holders of Securities, so that this
Security, if then outstanding, will be convertible thereafter, during the
period this Security shall be convertible as specified above, only into the
kind and amount of securities, cash and other property receivable upon the
consolidation, merger or sale by a holder of the number of shares of Common
Stock into which this Security might have been converted immediately prior to
such consolidation, merger or sale (assuming such holder of Common Stock failed
to exercise any rights of election and received per share the kind and amount
received per share by a plurality of non-electing shares).  In the event of
conversion of this Security in part only, a new Security or Securities for the
unconverted portion hereof shall be issued in the name of the Holder hereof
upon the cancellation hereof.]

     [IF THE SECURITY IS CONVERTIBLE INTO OTHER SECURITIES OF THE COMPANY,
SPECIFY THE CONVERSION FEATURES.]

     [IF THE SECURITY IS NOT AN ORIGINAL ISSUE DISCOUNT SECURITY, INSERT -- If
an Event of Default with respect to Securities of this series shall occur and
be continuing, the principal of the Securities of this series may be declared
due and payable in the manner and with the effect provided in the Indenture.]

     [IF THE SECURITY IS AN ORIGINAL ISSUE DISCOUNT SECURITY, INSERT -- If an
Event of Default with respect to Securities of this series shall occur and be
continuing, an amount of principal of the Securities of this series may be
declared due and payable in the manner and with the effect provided in the
Indenture.  Such amount shall be equal to -- insert formula for determining the
amount.  Upon payment (i) of the amount of principal so declared due and
payable and (ii) of interest on any overdue principal, premium and interest (in
each case to the extent that the payment of such interest shall be legally
enforceable), all of the Company's obligations in respect of the payment of the
principal of and premium and interest, if any, on the Securities of this series
shall terminate.]

     The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of the Securities of each series to be
affected under the Indenture at any time by the Company and the Trustee with
the consent of the Holders of more than 50% in principal amount of the
Securities at the time Outstanding of each series to be affected.  The
Indenture also contains provisions permitting the Holders of specified
percentages in principal amount of the Securities of each series at the time
Outstanding, on behalf of the Holders of all Securities of such series, to
waive compliance by the Company with certain provisions of the Indenture and
certain past defaults under the Indenture and their consequences.  Any such
consent or waiver by the Holder of this Security shall be conclusive and
binding upon such Holder and upon all future Holders of this Security and of
any Security issued upon the registration of transfer hereof or in exchange
herefor or in lieu hereof, whether or not notation of such consent or waiver is
made upon this Security.

     As provided in and subject to the provisions of the Indenture, the Holder
of this Security shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously





                                      -19-
<PAGE>   27

given the Trustee written notice of a continuing Event of Default with respect
to the Securities of this series, the Holders of not less than 25% in principal
amount of the Securities of this series at the time Outstanding shall have made
written request to the Trustee to institute proceedings in respect of such
Event of Default as Trustee and offered the Trustee reasonable indemnity, and
the Trustee shall not have received from the Holders of a majority in principal
amount of Securities of this series at the time Outstanding a direction
inconsistent with such request, and shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity.  The foregoing shall not apply to any suit instituted by the Holder
of this Security for the enforcement of any payment of principal hereof or any
premium or interest hereon on or after the respective due dates expressed
herein.

     No reference herein to the Indenture and no provision of this Security or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and any premium and
interest on this Security at the times, place and rate, and in the coin or
currency, herein prescribed.

     As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Security is registrable in the Security
Register, upon surrender of this Security for registration of transfer at the
office or agency of the Company in any place where the principal of and any
premium and interest on this Security are payable, duly endorsed by, or
accompanied by a written instrument of transfer in form satisfactory to the
Company and the Security Registrar duly executed by, the Holder hereof or its
attorney duly authorized in writing, and thereupon one or more new Securities
of this series and of like tenor, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees.

     The Securities of this series are issuable only in registered form without
coupons in denominations of $______ and any integral multiple thereof.  As
provided in the Indenture and subject to certain limitations therein set forth,
Securities of this series are exchangeable for a like aggregate principal
amount of Securities of this series and of like tenor of a different authorized
denomination, as requested by the Holder surrendering the same.

     No service charge shall be made for any such registration of transfer or
exchange, but the Company may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     Prior to due presentment of this Security for registration of transfer,
the Company, the Trustee and any agent of the Company or the Trustee may treat
the Person in whose name this Security is registered as the owner hereof for
all purposes, whether or not this Security be overdue, and neither the Company,
the Trustee nor any such agent shall be affected by notice to the contrary.

     All terms used in this Security which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

SECTION 204.   FORM OF LEGEND FOR GLOBAL SECURITIES.





                                      -20-
<PAGE>   28


     Unless otherwise specified as contemplated by Section 301 for the
Securities evidenced thereby, every Global Security authenticated and delivered
hereunder shall bear a legend in substantially the following form:

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY OR A
NOMINEE THEREOF.  THIS SECURITY MAY NOT BE EXCHANGED IN WHOLE OR IN PART FOR A
SECURITY REGISTERED, AND NO TRANSFER OF THIS SECURITY IN WHOLE OR IN PART MAY
BE REGISTERED, IN THE NAME OF ANY PERSON OTHER THAN SUCH DEPOSITARY OR A
NOMINEE THEREOF, EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE
INDENTURE.

SECTION 205.   FORM OF TRUSTEE'S CERTIFICATE OF AUTHENTICATION.

     The Trustee's certificates of authentication shall be in substantially the
following form:

     This is one of the Securities of the series designated herein referred to
in the within-mentioned Indenture.


                                    LASALLE NATIONAL BANK
                                    As Trustee

                                    By:________________________________
                                         Authorized Officer

SECTION 206.   FORM OF CONVERSION NOTICE.

     Conversion notices shall be in substantially the following form:

     To Westell Technologies, Inc.:

     The undersigned owner of this Security hereby irrevocably exercises the
option to convert this Security, or portion hereof (which is $1,000 or an
integral multiple thereof) below designated, into shares of Common Stock of the
Company in accordance with the terms of the Indenture referred to in this
Security, and directs that the shares issuable and deliverable upon the
conversion, together with any check in payment for fractional shares and any
Securities representing any unconverted principal amount hereof, be issued and
delivered to the registered holder hereof unless a different name has been
indicated below.  If this Notice is being delivered on a date after the close
of business on a Regular Record Date and prior to the opening of business on
the related Interest Payment Date (unless this Security or the portion thereof
being converted has been called for redemption on a Redemption Date during the
period beginning at the close of business on a Regular Record Date and





                                      -21-
<PAGE>   29

ending at the opening of business on the first Business Day after the next
succeeding Interest Payment Date, or if such Interest Payment Date is not a
Business Day, the second such Business Day), this Notice is accompanied by
payment, in funds acceptable to the Company, of an amount equal to the interest
payable on such Interest Payment Date of the principal of this Security to be
converted.  If shares are to be issued in the name of a person other than the
undersigned, the undersigned will pay all transfer taxes payable with respect
hereto.  Any amount required to be paid by the undersigned on account of
interest accompanies this Security.

        Principal Amount to be Converted
(in an integral multiple of $1,000, if less than
                      all)
                 U.S. $_________

Dated: ___________________                   
                                                                               
                                 ______________________________________________
                                 
                                 ______________________________________________
                                 Signature(s) must be guaranteed by
                                 a qualified guarantor institution
                                 if shares of Common Stock are
                                 to be delivered, or Securities to
                                 be issued, other than to and in
                                 the name of the registered owner.
                                 
                                                                              
                                 ______________________________________________
                                 Signature Guaranty

     Fill in for registration of shares of Common Stock and Security if to be
issued otherwise than to the registered Holder.


_______________________________                _________________________________
(Name)                                         Social Security or Other Taxpayer
                                               Identification Number
_______________________________
(Address)

_______________________________
Please print Name and Address
(including zip code number)

[The above conversion notice is to be modified, as appropriate, for conversion
into other securities or property of the Company.]





                                      -22-
<PAGE>   30

                                 ARTICLE THREE

                                 THE SECURITIES

SECTION 301.   AMOUNT UNLIMITED; ISSUABLE IN SERIES.

     The aggregate principal amount of Securities which may be authenticated
and delivered under this Indenture is unlimited.

     The Securities may be issued in one or more series.  There shall be
established in or pursuant to a Board Resolution and, subject to Section 303,
set forth, or determined in the manner provided, in an Officers' Certificate,
or established in one or more indentures supplemental hereto, prior to the
issuance of Securities of any series,

     (1)  the title of the Securities of the series (which shall distinguish
the Securities of the series from Securities of any other series);

     (2)  any limit upon the aggregate principal amount of the Securities of
the series which may be authenticated and delivered under this Indenture
(except for Securities authenticated and delivered upon registration of
transfer of, or in exchange for, or in lieu of, other Securities of the series
pursuant to Section 304, 305, 306, 906 or 1107 and except for any Securities
which, pursuant to Section 303, are deemed never to have been authenticated and
delivered hereunder);

     (3)  the Person to whom any interest on a Security of the series shall be
payable, if other than the Person in whose name that Security (or one or more
Predecessor Securities) is registered at the close of business on the Regular
Record Date for such interest;

     (4)  the date or dates on which the principal of any Securities of the
series is payable;

     (5)  the rate or rates at which any Securities of the series shall bear
interest, if any, the date or dates from which any such interest shall accrue,
the Interest Payment Dates on which any such interest shall be payable and the
Regular Record Date for any such interest payable on any Interest Payment Date;

     (6)  the place or places where the principal of and any premium and
interest on any Securities of the series shall be payable;

     (7)  the period or periods within which, the price or prices at which and
the terms and conditions upon which any Securities of the series may be
redeemed, in whole or in part, at the option of the Company and, if other than
by a Board Resolution, the manner in which any election by the Company to
redeem the Securities shall be evidenced;

     (8)  the obligation, if any, of the Company to redeem or purchase any
Securities of the series pursuant to any sinking fund or analogous provisions
or at the option of the Holder thereof and





                                      -23-
<PAGE>   31

the period or periods within which, the price or prices at which and the terms
and conditions upon which any Securities of the series shall be redeemed or
purchased, in whole or in part, pursuant to such obligation;

     (9)  if other than denominations of $1,000 and any integral multiple
thereof, the denominations in which any Securities of the series shall be
issuable;

     (10) if the amount of principal of or any premium or interest on any
Securities of the series may be determined with reference to an index or
pursuant to a formula, the manner in which such amounts shall be determined;

     (11) if other than the currency of the United States of America, the
currency, currencies or currency units in which the principal of or any premium
or interest on any Securities of the series shall be payable (and the manner of
determining the equivalent thereof in the currency of the United States of
America for any purpose, including for purposes of the definition of
"Outstanding" in Section 101);

     (12) if the principal of or any premium or interest on any Securities of
the series is to be payable, at the election of the Company or the Holder
thereof, in one or more currencies or currency units other than those in which
such Securities are stated to be payable, the currency, currencies or currency
units in which the principal of or any premium or interest on such Securities
as to which such election is made shall be payable, the periods within which
and the terms and conditions upon which such election is to be made and the
amount so payable (or the manner in which such amount shall be determined);

     (13) if other than the entire principal amount thereof, the portion of the
principal amount of any Securities of the series which shall be payable upon
declaration of acceleration of the Maturity thereof pursuant to Section 502;

     (14) if the principal amount payable at the Stated Maturity of any
Securities of the series will not be determinable as of any one or more dates
prior to the Stated Maturity, the amount which shall be deemed to be the
principal amount of such Securities as of any such date for any purpose,
including the principal amount thereof which shall be due and payable upon any
Maturity other than the Stated Maturity or which shall be deemed to be
Outstanding as of any date prior to the Stated Maturity (or, in any such case,
the manner in which such amount deemed to be the principal amount shall be
determined);

     (15) if applicable, that the Securities of the series, in whole or any
specified part, shall be defeasible pursuant to Section 1302 or Section 1303 or
both such Sections and, if other than by a Board Resolution, the manner in
which any election by the Company to defease such Securities shall be
evidenced;

     (16) if applicable, the terms of any right to convert Securities of the
series into shares of Common Stock of the Company or other securities or
property;





                                      -24-
<PAGE>   32


     (17) if applicable, that any Securities of the series shall be issuable in
whole or in part in the form of one or more Global Securities and, in such
case, the respective Depositaries for such Global Securities, the form of any
legend or legends which shall be borne by any such Global Security in addition
to or in lieu of that set forth in Section 204 and any circumstances in
addition to or in lieu of those set forth in Clause (2) of the last paragraph
of Section 305 in which any such Global Security may be exchanged in whole or
in part for Securities registered, and any transfer of such Global Security in
whole or in part may be registered, in the name or names of Persons other than
the Depositary for such Global Security or a nominee thereof;

     (18) any addition to or change in the Events of Default which applies to
any Securities of the series and any change in the right of the Trustee or the
requisite Holders of such Securities to declare the principal amount thereof
due and payable pursuant to Section 502;

     (19) the nonapplicability of, or any addition to or change in the
covenants set forth in Article Ten which applies to Securities of the series;
and

     (20) any other terms of the series (which terms shall not be inconsistent
with the provisions of this Indenture, except as permitted by Section 901(5)).

     All Securities of any one series shall be substantially identical except
as to denomination and except as may otherwise be provided in or pursuant to
the Board Resolution referred to above and (subject to Section 303) set forth,
or determined in the manner provided, in the Officers' Certificate referred to
above or in any such indenture supplemental hereto.

     If any of the terms of the series are established by action taken pursuant
to a Board Resolution, a copy of an appropriate record of such action shall be
certified by the Secretary or an Assistant Secretary of the Company and
delivered to the Trustee at or prior to the delivery of the Officers'
Certificate setting forth the terms of the series.

SECTION 302.   DENOMINATIONS.

     The Securities of each series shall be issuable only in registered form
without coupons and only in such denominations as shall be specified as
contemplated by Section 301.  In the absence of any such specified denomination
with respect to the Securities of any series, the Securities of such series
shall be issuable in denominations of $1,000 and any integral multiple thereof.

SECTION 303.   EXECUTION, AUTHENTICATION, DELIVERY AND DATING.

     The Securities shall be executed on behalf of the Company by its Chairman
of the Board, its Vice Chairman of the Board, its principal financial officer,
its President or one of its Vice Presidents, under its corporate seal
reproduced thereon attested by its Secretary or one of its Assistant
Secretaries.  The signature of any of these officers on the Securities may be
manual or facsimile.





                                      -25-
<PAGE>   33

     Securities bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

     At any time and from time to time after the execution and delivery of this
Indenture, the Company may deliver Securities of any series executed by the
Company to the Trustee for authentication, together with a Company Order for
the authentication and delivery of such Securities, and the Trustee in
accordance with the Company Order shall authenticate and deliver such
Securities.  If the form or terms of the Securities of the series have been
established by or pursuant to one or more Board Resolutions as permitted by
Sections 201 and 301, in authenticating such Securities, and accepting the
additional responsibilities under this Indenture in relation to such
Securities, the Trustee shall be entitled to receive, and (subject to Section
601) shall be fully protected in relying upon, a copy of such Board Resolution,
the Officers' Certificate setting forth the terms of the series and an Opinion
of Counsel, with such Opinion of Counsel stating,

     (1)  if the form of such Securities has been established by or pursuant to
Board Resolution as permitted by Section 201, that such form has been
established in conformity with the provisions of this Indenture;

     (2)  if the terms of such Securities have been established by or pursuant
to Board Resolution as permitted by Section 301, that such terms have been
established in conformity with the provisions of this Indenture; and

     (3)  that such Securities, when authenticated and delivered by the Trustee
and issued by the Company in the manner and subject to any conditions specified
in such Opinion of Counsel, will constitute valid and legally binding
obligations of the Company enforceable in accordance with their terms, subject
to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and
similar laws of general applicability relating to or affecting creditors'
rights and to general equity principles.

     If such form or terms have been so established, the Trustee shall not be
required to authenticate such Securities if the issue of such Securities
pursuant to this Indenture will affect the Trustee's own rights, duties or
immunities under the Securities and this Indenture or otherwise in a manner
which is not reasonably acceptable to the Trustee.

     Notwithstanding the provisions of Section 301 and of the preceding
paragraph, if all Securities of a series are not to be originally issued at one
time, it shall not be necessary to deliver the Officers' Certificate otherwise
required pursuant to Section 301 or the Company Order and Opinion of Counsel
otherwise required pursuant to such preceding paragraph at or prior to the
authentication of each Security of such series if such documents are delivered
at or prior to the authentication upon original issuance of the first Security
of such series to be issued.

     Each Security shall be dated the date of its authentication.





                                      -26-
<PAGE>   34

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein
executed by the Trustee by manual signature, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such
Security has been duly authenticated and delivered hereunder.  Notwithstanding
the foregoing, if any Security shall have been authenticated and delivered
hereunder but never issued and sold by the Company, and the Company shall
deliver such Security to the Trustee for cancellation as provided in Section
309, for all purposes of this Indenture such Security shall be deemed never to
have been authenticated and delivered hereunder and shall never be entitled to
the benefits of this Indenture.

SECTION 304.   TEMPORARY SECURITIES.

     Pending the preparation of definitive Securities of any series, the
Company may execute, and upon Company Order the Trustee shall authenticate and
deliver, temporary Securities which are printed, lithographed, typewritten,
mimeographed or otherwise produced, in any authorized denomination,
substantially of the tenor of the definitive Securities in lieu of which they
are issued and with such appropriate insertions, omissions, substitutions and
other variations as the officers executing such Securities may determine, as
evidenced by their execution of such Securities.

     If temporary Securities of any series are issued, the Company will cause
definitive Securities of that series to be prepared without unreasonable delay.
After the preparation of definitive Securities of such series, the temporary
Securities of such series shall be exchangeable for definitive Securities of
such series upon surrender of the temporary Securities of such series at the
office or agency of the Company in a Place of Payment for that series, without
charge to the Holder.  Upon surrender for cancellation of any one or more
temporary Securities of any series, the Company shall execute and the Trustee
shall authenticate and deliver in exchange therefor one or more definitive
Securities of the same series, of any authorized denominations and of like
tenor and aggregate principal amount.  Until so exchanged, the temporary
Securities of any series shall in all respects be entitled to the same benefits
under this Indenture as definitive Securities of such series and tenor.

SECTION 305.   REGISTRATION; REGISTRATION OF TRANSFER AND EXCHANGE.

     The Company shall cause to be kept at the Corporate Trust Office of the
Trustee a register (the register maintained in such office and in any other
office or agency of the Company in a Place of Payment being herein sometimes
collectively referred to as the "Security Register") in which, subject to such
reasonable regulations as it may prescribe, the Company shall provide for the
registration of Securities and of transfers of Securities.  The Trustee is
hereby appointed "Security Registrar" for the purpose of registering Securities
and transfers of Securities as herein provided.

     Upon surrender for registration of transfer of any Security of a series at
the office or agency of the Company in a Place of Payment for that series, the
Company shall execute, and the Trustee shall authenticate and deliver, in the
name of the designated transferee or transferees, one or more new Securities of
the same series, of any authorized denominations and of like tenor and
aggregate principal amount.





                                      -27-
<PAGE>   35


     At the option of the Holder, Securities of any series may be exchanged for
other Securities of the same series, of any authorized denominations and of
like tenor and aggregate principal amount, upon surrender of the Securities to
be exchanged at such office or agency.  Whenever any Securities are so
surrendered for exchange, the Company shall execute, and the Trustee shall
authenticate and deliver, the Securities which the Holder making the exchange
is entitled to receive.

     All Securities issued upon any registration of transfer or exchange of
Securities shall be the valid obligations of the Company, evidencing the same
debt, and entitled to the same benefits under this Indenture, as the Securities
surrendered upon such registration of transfer or exchange.

     Every Security presented or surrendered for registration of transfer or
for exchange shall (if so required by the Company or the Trustee) be duly
endorsed, or be accompanied by a written instrument of transfer in form
satisfactory to the Company and the Security Registrar duly executed, by the
Holder thereof or its attorney duly authorized in writing.

     No service charge shall be made for any registration of transfer or
exchange of Securities, but the Company may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
with any registration of transfer or exchange of Securities, other than
exchanges pursuant to Section 304, 906 or 1107 not involving any transfer.

     If the Securities of any series (or of any series and specified tenor) are
to be redeemed in part, the Company shall not be required (A) to issue,
register the transfer of or exchange any Securities of that series (or of that
series and specified tenor, as the case may be) during a period beginning at
the opening of business 15 days before the day of the mailing of a notice of
redemption of any such Securities selected for redemption under Section 1103
and ending at the close of business on the day of such mailing, or (B) to
register the transfer of or exchange any Security so selected for redemption in
whole or in part, except the unredeemed portion of any Security being redeemed
in part.

     The provisions of Clauses (1), (2), (3) and (4) below shall apply only to
Global Securities:

     (1)  Each Global Security authenticated under this Indenture shall be
registered in the name of the Depositary designated for such Global Security or
a nominee thereof and delivered to such Depositary or a nominee thereof or
custodian therefor, and each such Global Security shall constitute a single
Security for all purposes of this Indenture.

     (2)  Notwithstanding any other provision in this Indenture, no Global
Security may be exchanged in whole or in part for Securities registered, and no
transfer of a Global Security in whole or in part may be registered, in the
name of any Person other than the Depositary for such Global Security or a
nominee thereof unless (A) such Depositary (i) has notified the Company that it
is unwilling or unable to continue as Depositary for such Global Security or
(ii) has ceased to be a clearing agency registered under the Exchange Act, (B)
there shall have occurred and be continuing an Event of Default with respect to
such Global Security or (C) there shall exist such circumstances, if any, in
addition to or in lieu of the foregoing as have been specified for this purpose
as contemplated by Section 301.





                                      -28-
<PAGE>   36


     (3)  Subject to Clause (2) above, any exchange of a Global Security for
other Securities may be made in whole or in part, and all Securities issued in
exchange for a Global Security or any portion thereof shall be registered in
such names as the Depositary for such Global Security shall direct.

     (4)  Every Security authenticated and delivered upon registration of
transfer of, or in exchange for or in lieu of, a Global Security or any portion
thereof, whether pursuant to this Section, Section 304, 306, 906 or 1107 or
otherwise, shall be authenticated and delivered in the form of, and shall be, a
Global Security, unless such Security is registered in the name of a Person
other than the Depositary for such Global Security or a nominee thereof.

SECTION 306.   MUTILATED, DESTROYED, LOST AND STOLEN SECURITIES.

     If any mutilated Security is surrendered to the Trustee, the Company shall
execute and the Trustee shall authenticate and deliver in exchange therefor a
new Security of the same series and of like tenor and principal amount and
bearing a number not contemporaneously outstanding.

     If there shall be delivered to the Company and the Trustee (i) evidence to
their satisfaction of the destruction, loss or theft of any Security and (ii)
such security or indemnity as may be required by them to save each of them and
any agent of either of them harmless, then, in the absence of notice to the
Company or the Trustee that such Security has been acquired by a bona fide
purchaser, the Company shall execute and the Trustee shall authenticate and
deliver, in lieu of any such destroyed, lost or stolen Security, a new Security
of the same series and of like tenor and principal amount and bearing a number
not contemporaneously outstanding.

     In case any such mutilated, destroyed, lost or stolen Security has become
or is about to become due and payable, the Company in its discretion may,
instead of issuing a new Security, pay such Security.

     Upon the issuance of any new Security under this Section, the Company may
require the payment of a sum sufficient to cover any tax or other governmental
charge that may be imposed in relation thereto and any other expenses
(including the fees and expenses of the Trustee) connected therewith.

     Every new Security of any series issued pursuant to this Section in lieu
of any destroyed, lost or stolen Security shall constitute an original
additional contractual obligation of the Company, whether or not the destroyed,
lost or stolen Security shall be at any time enforceable by anyone, and shall
be entitled to all the benefits of this Indenture equally and proportionately
with any and all other Securities of that series duly issued hereunder.

     The provisions of this Section are exclusive and shall preclude (to the
extent lawful) all other rights and remedies with respect to the replacement or
payment of mutilated, destroyed, lost or stolen Securities.





                                      -29-
<PAGE>   37

SECTION 307.   PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.

     Except as otherwise provided as contemplated by Section 301 with respect
to any series of Securities, interest on any Security which is payable, and is
punctually paid or duly provided for, on any Interest Payment Date shall be
paid to the Person in whose name that Security (or one or more Predecessor
Securities) is registered at the close of business on the Regular Record Date
for such interest.

     Any interest on any Security of any series which is payable, but is not
punctually paid or duly provided for, on any Interest Payment Date (herein
called "Defaulted Interest") shall forthwith cease to be payable to the Holder
on the relevant Regular Record Date by virtue of having been such Holder, and
such Defaulted Interest may be paid by the Company, at its election in each
case, as provided in Clause (1) or (2) below:

     (1)  The Company may elect to make payment of any Defaulted Interest to
the Persons in whose names the Securities of such series (or their respective
Predecessor Securities) are registered at the close of business on a Special
Record Date for the payment of such Defaulted Interest, which shall be fixed in
the following manner.  The Company shall notify the Trustee in writing of the
amount of Defaulted Interest proposed to be paid on each Security of such
series and the date of the proposed payment, and at the same time the Company
shall deposit with the Trustee an amount of money equal to the aggregate amount
proposed to be paid in respect of such Defaulted Interest or shall make
arrangements satisfactory to the Trustee for such deposit prior to the date of
the proposed payment, such money when deposited to be held in trust for the
benefit of the Persons entitled to such Defaulted Interest as in this Clause
provided.  Thereupon the Trustee shall fix a Special Record Date for the
payment of such Defaulted Interest which shall be not more than 15 days and not
less than 10 days prior to the date of the proposed payment and not less than
10 days after the receipt by the Trustee of the notice of the proposed payment.
The Trustee shall promptly notify the Company of such Special Record Date and,
in the name and at the expense of the Company, shall cause notice of the
proposed payment of such Defaulted Interest and the Special Record Date
therefor to be given to each Holder of Securities of such series in the manner
set forth in Section 106, not less than 10 days prior to such Special Record
Date.  Notice of the proposed payment of such Defaulted Interest and the
Special Record Date therefor having been so mailed, such Defaulted Interest
shall be paid to the Persons in whose names the Securities of such series (or
their respective Predecessor Securities) are registered at the close of
business on such Special Record Date and shall no longer be payable pursuant to
the following Clause (2).

     (2)  The Company may make payment of any Defaulted Interest on the
Securities of any series in any other lawful manner not inconsistent with the
requirements of any securities exchange on which such Securities may be listed,
and upon such notice as may be required by such exchange, if, after notice
given by the Company to the Trustee of the proposed payment pursuant to this
Clause, such manner of payment shall be deemed practicable by the Trustee.

     Subject to the foregoing provisions of this Section, each Security
delivered under this Indenture upon registration of transfer of or in exchange
for or in lieu of any other Security shall





                                      -30-
<PAGE>   38

carry the rights to interest accrued and unpaid, and to accrue, which were
carried by such other Security.

     Subject to the provisions of Section 1402, in the case of any Security (or
any part thereof) which is converted after any Regular Record Date and on or
prior to the next succeeding Interest Payment Date (other than any Security the
principal of (or premium, if any, on) which shall become due and payable,
whether at Stated Maturity or by declaration of acceleration prior to such
Interest Payment Date), interest whose Stated Maturity is on such Interest
Payment Date shall be payable on such Interest Payment Date notwithstanding
such conversion and such interest (whether or not punctually paid or duly
provided for) shall be paid to the Person in whose name that Security (or any
one or more Predecessor Securities) is registered at the close of business on
such Regular Record Date.  Except as otherwise expressly provided in the
immediately preceding sentence or in Section 1402, in the case of any Security
(or any part thereof) which is converted, interest whose Stated Maturity is
after the date of conversion of such Security (or such part thereof) shall not
be payable.

SECTION 308.   PERSONS DEEMED OWNERS.

     Prior to due presentment of a Security for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name such Security is registered as the owner of such Security
for the purpose of receiving payment of principal of and any premium and
(subject to Section 307) any interest on such Security and for all other
purposes whatsoever, whether or not such Security be overdue, and neither the
Company, the Trustee nor any agent of the Company or the Trustee shall be
affected by notice to the contrary.

SECTION 309.   CANCELLATION.

     All Securities surrendered for payment, redemption, registration of
transfer or exchange or for credit against any sinking fund payment shall, if
surrendered to any Person other than the Trustee, be delivered to the Trustee
and shall be promptly canceled by it.  The Company may at any time deliver to
the Trustee for cancellation any Securities previously authenticated and
delivered hereunder which the Company may have acquired in any manner
whatsoever, and may deliver to the Trustee (or to any other Person for delivery
to the Trustee) for cancellation any Securities previously authenticated
hereunder which the Company has not issued and sold, and all Securities so
delivered shall be promptly canceled by the Trustee.  No Securities shall be
authenticated in lieu of or in exchange for any Securities canceled as provided
in this Section, except as expressly permitted by this Indenture.  All canceled
Securities held by the Trustee shall be disposed of as directed by a Company
Order.

SECTION 310.   COMPUTATION OF INTEREST.

     Except as otherwise specified as contemplated by Section 301 for
Securities of any series, interest on the Securities of each series shall be
computed on the basis of a 360-day year of twelve 30-day months.





                                      -31-
<PAGE>   39


                                  ARTICLE FOUR

                           SATISFACTION AND DISCHARGE

SECTION 401.   SATISFACTION AND DISCHARGE OF INDENTURE.

     This Indenture shall upon Company Request cease to be of further effect
(except as to any surviving rights of registration of transfer or exchange of
Securities herein expressly provided for), and the Trustee, at the expense of
the Company, shall execute proper instruments acknowledging satisfaction and
discharge of this Indenture, when

     (1)  either

          (A)  all Securities theretofore authenticated and delivered (other
     than (i) Securities which have been destroyed, lost or stolen and which
     have been replaced or paid as provided in Section 306 and (ii) Securities
     for whose payment money has theretofore been deposited in trust or
     segregated and held in trust by the Company and thereafter repaid to the
     Company or discharged from such trust, as provided in Section 1003) have
     been delivered to the Trustee for cancellation; or

          (B)  all such Securities not theretofore delivered to the Trustee for
     cancellation

                          (i)  have become due and payable, or

                          (ii) will become due and payable at their Stated
     Maturity within one year, or

                          (iii)     are to be called for redemption within one
     year under arrangements satisfactory to the Trustee for the giving of
     notice of redemption by the Trustee in the name, and at the expense, of
     the Company, and the Company,

     in the case of (i), (ii) or (iii) above, has deposited or caused to be
     deposited with the Trustee as trust funds in trust for the purpose money
     in an amount sufficient to pay and discharge the entire indebtedness on
     such Securities not theretofore delivered to the Trustee for cancellation,
     for principal and any premium and interest to the date of such deposit (in
     the case of Securities which have become due and payable) or to the Stated
     Maturity or Redemption Date, as the case may be;

     (2)  the Company has paid or caused to be paid all other sums payable
hereunder by the Company; and

     (3)  the Company has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel, each stating that all conditions precedent herein
provided for relating to the satisfaction and discharge of this Indenture have
been complied with.





                                      -32-
<PAGE>   40


     Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee under Section 607, the obligations of
the Trustee to any Authenticating Agent under Section 614 and, if money shall
have been deposited with the Trustee pursuant to subclause (B) of Clause (1) of
this Section, the obligations of the Trustee under Section 402 and the last
paragraph of Section 1003 shall survive.

SECTION 402.   APPLICATION OF TRUST MONEY.

     Subject to the provisions of the last paragraph of Section 1003, all money
deposited with the Trustee pursuant to Section 401 shall be held in trust and
applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the principal and any premium
and interest for whose payment such money has been deposited with the Trustee.

                                  ARTICLE FIVE

                                    REMEDIES

SECTION 501.   EVENTS OF DEFAULT.

     "Event of Default," wherever used herein with respect to Securities of any
series, means any one of the following events (whatever the reason for such
Event of Default and whether it shall be voluntary or involuntary or be
effected by operation of law or pursuant to any judgment, decree or order of
any court or any order, rule or regulation of any administrative or
governmental body):

     (1)  default in the payment of any interest upon any Security of that
series when it becomes due and payable, and continuance of such default for a
period of 30 days; or

     (2)  default in the payment of the principal of or any premium on any
Security of that series at its Maturity; or

     (3)  default in the deposit of any sinking fund payment, when and as due
by the terms of a Security of that series; or

     (4)  default in the performance, or breach, of any covenant or warranty of
the Company in this Indenture (other than a covenant or warranty a default in
whose performance or whose breach is elsewhere in this Section specifically
dealt with or which has expressly been included in this Indenture solely for
the benefit of series of Securities other than that series), and continuance of
such default or breach for a period of 60 days after there has been given, by
registered or certified mail, to the Company by the Trustee or to the Company
and the Trustee by the Holders of at least 25% in principal amount of the
Outstanding Securities of that series a written notice specifying such default
or breach and requiring it to be remedied and stating that such notice is a
"Notice of Default" hereunder; or





                                      -33-
<PAGE>   41


     (5)  the entry by a court having jurisdiction in the premises of (A) a
decree or order for relief in respect of the Company in an involuntary case or
proceeding under any applicable Federal or State bankruptcy, insolvency,
reorganization or other similar law or (B) a decree or order adjudging the
Company a bankrupt or insolvent, or approving as properly filed a petition
seeking reorganization, arrangement, adjustment or composition of or in respect
of the Company under any applicable Federal or State law, or appointing a
custodian, receiver, liquidator, assignee, trustee, sequestrator or other
similar official of the Company or of any substantial part of its property, or
ordering the winding up or liquidation of its affairs, and the continuance of
any such decree or order for relief or any such other decree or order unstayed
and in effect for a period of 90 consecutive days; or

     (6)  the commencement by the Company of a voluntary case or proceeding
under any applicable Federal or State bankruptcy, insolvency, reorganization or
other similar law or of any other case or proceeding to be adjudicated a
bankrupt or insolvent, or the consent by it to the entry of a decree or order
for relief in respect of the Company in an involuntary case or proceeding under
any applicable Federal or State bankruptcy, insolvency, reorganization or other
similar law or to the commencement of any bankruptcy or insolvency case or
proceeding against it, or the filing by it of a petition or answer or consent
seeking reorganization or relief under any applicable Federal or State law, or
the consent by it to the filing of such petition or to the appointment of or
taking possession by a custodian, receiver, liquidator, assignee, trustee,
sequestrator or other similar official of the Company or of any substantial
part of its property, or the making by it of an assignment for the benefit of
creditors, or the admission by it in writing of its inability to pay its debts
generally as they become due, or the taking of corporate action by the Company
in furtherance of any such action; or

     (7)  any other Event of Default provided with respect to Securities of
that series.

SECTION 502.   ACCELERATION OF MATURITY; RESCISSION AND ANNULMENT.

     If an Event of Default (other than an Event of Default specified in
Section 501(5) or 501(6)) with respect to Securities of any series at the time
Outstanding occurs and is continuing, then in every such case the Trustee or
the Holders of not less than 25% in principal amount of the Outstanding
Securities of that series may declare the principal amount of all the
Securities of that series (or, if any Securities of that series are Original
Issue Discount Securities, such portion of the principal amount of such
Securities as may be specified by the terms thereof) to be due and payable
immediately, by a notice in writing to the Company (and to the Trustee if given
by Holders), and upon any such declaration such principal amount (or specified
amount) shall become immediately due and payable.  If an Event of Default
specified in Section 501(5) or 501(6) with respect to Securities of any series
at the time Outstanding occurs, the principal amount of all the Securities of
that series (or, if any Securities of that series are Original Issue Discount
Securities, such portion of the principal amount of such Securities as may be
specified by the terms thereof) shall automatically, and without any
declaration or other action on the part of the Trustee or any Holder, become
immediately due and payable.





                                      -34-
<PAGE>   42

     At any time after such a declaration of acceleration with respect to
Securities of any series has been made and before a judgment or decree for
payment of the money due has been obtained by the Trustee as hereinafter in
this Article provided, the Holders of a majority in principal amount of the
Outstanding Securities of that series, by written notice to the Company and the
Trustee, may rescind and annul such declaration and its consequences if

     (1)  the Company has paid or deposited with the Trustee a sum sufficient to
pay 

          (A)  all overdue interest on all Securities of that series,

          (B)  the principal of (and premium, if any, on) any Securities of
     that series which have become due otherwise than by such declaration of
     acceleration and any interest thereon at the rate or rates prescribed
     therefor in such Securities,

          (C)  to the extent that payment of such interest is lawful, interest
     upon overdue interest at the rate or rates prescribed therefor in such
     Securities, and

          (D)  all sums paid or advanced by the Trustee hereunder and the
     reasonable compensation, expenses, disbursements and advances of the
     Trustee, its agents and counsel; and

     (2)  all Events of Default with respect to Securities of that series,
other than the non-payment of the principal of Securities of that series which
have become due solely by such declaration of acceleration, have been cured or
waived as provided in Section 513.

No such rescission shall affect any subsequent default or impair any right
consequent thereon.

SECTION 503.   COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT BY TRUSTEE.

     The Company covenants that if

     (1)  default is made in the payment of any interest on any Security when
such interest becomes due and payable and such default continues for a period
of 30 days, or

     (2)  default is made in the payment of the principal of (or premium, if
any, on) any Security at the Maturity thereof,

the Company will, upon demand of the Trustee, pay to it, for the benefit of the
Holders of such Securities, the whole amount then due and payable on such
Securities for principal and any premium and interest and, to the extent that
payment of such interest shall be legally enforceable, interest on any overdue
principal and premium and on any overdue interest, at the rate or rates
prescribed therefor in such Securities, and, in addition thereto, such further
amount as shall be sufficient to cover the costs and expenses of collection,
including the reasonable compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel.





                                      -35-
<PAGE>   43


     If an Event of Default with respect to Securities of any series occurs and
is continuing, the Trustee may in its discretion proceed to protect and enforce
its rights and the rights of the Holders of Securities of such series by such
appropriate judicial proceedings as the Trustee shall deem most effectual to
protect and enforce any such rights, whether for the specific enforcement of
any covenant or agreement in this Indenture or in aid of the exercise of any
power granted herein, or to enforce any other proper remedy.

SECTION 504.   TRUSTEE MAY FILE PROOFS OF CLAIM.

     In case of any judicial proceeding relative to the Company (or any other
obligor upon the Securities), its property or its creditors, the Trustee shall
be entitled and empowered, by intervention in such proceeding or otherwise, to
take any and all actions authorized under the Trust Indenture Act in order to
have claims of the Holders and the Trustee allowed in any such proceeding.  In
particular, the Trustee shall be authorized to collect and receive any moneys
or other property payable or deliverable on any such claims and to distribute
the same; and any custodian, receiver, assignee, trustee, liquidator,
sequestrator or other similar official in any such judicial proceeding is
hereby authorized by each Holder to make such payments to the Trustee and, in
the event that the Trustee shall consent to the making of such payments
directly to the Holders, to pay to the Trustee any amount due it for the
reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel, and any other amounts due the Trustee under Section
607.

     No provision of this Indenture shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding; provided, however,
that the Trustee may, on behalf of the Holders, vote for the election of a
trustee in bankruptcy or similar official and be a member of a creditors' or
other similar committee.

SECTION 505.   TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF SECURITIES.

     All rights of action and claims under this Indenture or the Securities may
be prosecuted and enforced by the Trustee without the possession of any of the
Securities or the production thereof in any proceeding relating thereto, and
any such proceeding instituted by the Trustee shall be brought in its own name
as trustee of an express trust, and any recovery of judgment shall, after
provision for the payment of the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

SECTION 506.   APPLICATION OF MONEY COLLECTED.

     Any money collected by the Trustee pursuant to this Article shall be
applied in the following order, at the date or dates fixed by the Trustee and,
in case of the distribution of such money on account of principal or any
premium or interest, upon presentation of the Securities and the notation
thereon of the payment if only partially paid and upon surrender thereof if
fully paid:





                                      -36-
<PAGE>   44


     FIRST:  To the payment of all amounts due the Trustee under Section 607;
and 

     SECOND:  To the payment of the amounts then due and unpaid for principal
of and any premium, if any, and interest on the Securities in respect of which
or for the benefit of which such money has been collected, ratably, without
preference or priority of any kind, according to the amounts due and payable on
such Securities for principal and any premium, if any, and interest,
respectively.

SECTION 507.   LIMITATION ON SUITS.

     No Holder of any Security of any series shall have any right to institute
any proceeding, judicial or otherwise, with respect to this Indenture, or for
the appointment of a receiver or trustee, or for any other remedy hereunder,
unless

     (1)  such Holder has previously given written notice to the Trustee of a
continuing Event of Default with respect to the Securities of that series;

     (2)  the Holders of not less than 25% in principal amount of the
Outstanding Securities of that series shall have made written request to the
Trustee to institute proceedings in respect of such Event of Default in its own
name as Trustee hereunder;

     (3)  such Holder or Holders have offered to the Trustee reasonable
indemnity against the costs, expenses and liabilities to be incurred in
compliance with such request;

     (4)  the Trustee for 60 days after its receipt of such notice, request and
offer of indemnity has failed to institute any such proceeding; and

     (5)  no direction inconsistent with such written request has been given to
the Trustee during such 60-day period by the Holders of a majority in principal
amount of the Outstanding Securities of that series;

it being understood and intended that no one or more of such Holders shall have
any right in any manner whatever by virtue of, or by availing of, any provision
of this Indenture to affect, disturb or prejudice the rights of any other of
such Holders, or to obtain or to seek to obtain priority or preference over any
other of such Holders or to enforce any right under this Indenture, except in
the manner herein provided and for the equal and ratable benefit of all of such
Holders.

SECTION 508.   UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, PREMIUM AND
INTEREST AND TO CONVERT.

     Notwithstanding any other provision in this Indenture, the Holder of any
Security shall have the right, which is absolute and unconditional, to receive
payment of the principal of and any premium and (subject to Section 307)
interest on such Security on the respective Stated Maturities expressed in such
Security (or, in the case of redemption, on the Redemption Date), to convert
such





                                      -37-
<PAGE>   45

Securities in accordance with Article Fourteen and to institute suit for the
enforcement of any such payment, and such rights shall not be impaired without
the consent of such Holder.

SECTION 509.   RESTORATION OF RIGHTS AND REMEDIES.

     If the Trustee or any Holder has instituted any proceeding to enforce any
right or remedy under this Indenture and such proceeding has been discontinued
or abandoned for any reason, or has been determined adversely to the Trustee or
to such Holder, then and in every such case, subject to any determination in
such proceeding, the Company, the Trustee and the Holders shall be restored
severally and respectively to their former positions hereunder and thereafter
all rights and remedies of the Trustee and the Holders shall continue as though
no such proceeding had been instituted.

SECTION 510.   RIGHTS AND REMEDIES CUMULATIVE.

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities in the last paragraph of
Section 306, no right or remedy herein conferred upon or reserved to the
Trustee or to the Holders is intended to be exclusive of any other right or
remedy, and every right and remedy shall, to the extent permitted by law, be
cumulative and in addition to every other right and remedy given hereunder or
now or hereafter existing at law or in equity or otherwise.  The assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent
the concurrent assertion or employment of any other appropriate right or
remedy.

SECTION 511.   DELAY OR OMISSION NOT WAIVER.

     No delay or omission of the Trustee or of any Holder of any Securities to
exercise any right or remedy accruing upon any Event of Default shall impair
any such right or remedy or constitute a waiver of any such Event of Default or
an acquiescence therein.  Every right and remedy given by this Article or by
law to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee (subject to the limitations
contained in this Indenture) or by the Holders, as the case may be.

SECTION 512.   CONTROL BY HOLDERS.

     The Holders of a majority in principal amount of the Outstanding
Securities of any series shall have the right to direct the time, method and
place of conducting any proceeding for any remedy available to the Trustee, or
exercising any trust or power conferred on the Trustee, with respect to the
Securities of such series, provided that

     (1)  such direction shall not be in conflict with any rule of law or with
this Indenture and the Trustee shall not have determined that the action so
directed would be unjustly prejudicial to Holders of Securities of that series,
or any other series, not taking part in such direction, and

     (2)  the Trustee may take any other action deemed proper by the Trustee
which is not inconsistent with such direction or this Indenture.





                                      -38-
<PAGE>   46


SECTION 513.   WAIVER OF PAST DEFAULTS.

     The Holders of not less than a majority in principal amount of the
Outstanding Securities of any series may on behalf of the Holders of all the
Securities of such series waive any past default hereunder with respect to such
series and its consequences, except a default

     (1)  in the payment of the principal of or any premium or interest on any
Security of such series, or

     (2)  in respect of a covenant or provision hereof which under Article Nine
cannot be modified or amended without the consent of the Holder of each
Outstanding Security of such series affected.

     Upon any such waiver, such default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured, for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
default or impair any right consequent thereon.

SECTION 514.   UNDERTAKING FOR COSTS.

     In any suit for the enforcement of any right or remedy under this
Indenture, or in any suit against the Trustee for any action taken, suffered or
omitted by it as Trustee, a court may require any party litigant in such suit
to file an undertaking to pay the costs of such suit, and may assess costs
against any such party litigant, in the manner and to the extent provided in
the Trust Indenture Act; provided that neither this Section nor the Trust
Indenture Act shall be deemed to authorize any court to require such an
undertaking or to make such an assessment in any suit instituted by the Company
or in any suit for the enforcement of the right to convert any Security in
accordance with Article Fourteen.

SECTION 515.   WAIVER OF USURY, STAY OR EXTENSION LAWS.

     The Company covenants (to the extent that it may lawfully do so) that it
will not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any usury, stay or extension law wherever
enacted, now or at any time hereafter in force, which may affect the covenants
or the performance of this Indenture; and the Company (to the extent that it
may lawfully do so) hereby expressly waives all benefit or advantage of any
such law and covenants that it will not hinder, delay or impede the execution
of any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law had been enacted.





                                      -39-
<PAGE>   47

                                  ARTICLE SIX

                                  THE TRUSTEE

SECTION 601.   CERTAIN DUTIES AND RESPONSIBILITIES.

     The duties and responsibilities of the Trustee shall be as provided by the
Trust Indenture Act.  Notwithstanding the foregoing, no provision of this
Indenture shall require the Trustee to expend or risk its own funds or
otherwise incur any financial liability in the performance of any of its duties
hereunder, or in the exercise of any of its rights or powers, if it shall have
reasonable grounds for believing that repayment of such funds or adequate
indemnity against such risk or liability is not reasonably assured to it.
Whether or not therein expressly so provided, every provision of this Indenture
relating to the conduct or affecting the liability of or affording protection
to the Trustee shall be subject to the provisions of this Section.

SECTION 602.   NOTICE OF DEFAULTS.

     If a default occurs hereunder with respect to Securities of any series,
the Trustee shall give the Holders of Securities of such series notice of such
default as and to the extent provided by the Trust Indenture Act; provided,
however, that in the case of any default of the character specified in Section
501(4) with respect to Securities of such series, no such notice to Holders
shall be given until at least 30 days after the occurrence thereof.   For the
purpose of this Section, the term "default" means any event which is, or after
notice or lapse of time or both would become, an Event of Default with respect
to Securities of such series.

SECTION 603.   CERTAIN RIGHTS OF TRUSTEE.

     Subject to the provisions of Section 601:

     (1)  the Trustee may rely and shall be protected in acting or refraining
from acting upon any resolution, certificate, statement, instrument, opinion,
report, notice, request, direction, consent, order, bond, debenture, note,
other evidence of indebtedness or other paper or document believed by it to be
genuine and to have been signed or presented by the proper party or parties;

     (2)  any request or direction of the Company mentioned herein shall be
sufficiently evidenced by a Company Request or Company Order, and any
resolution of the Board of Directors shall be sufficiently evidenced by a Board
Resolution;

     (3)  whenever in the administration of this Indenture the Trustee shall
deem it desirable that a matter be proved or established prior to taking,
suffering or omitting any action hereunder, the Trustee (unless other evidence
be herein specifically prescribed) may, in the absence of bad faith on its
part, rely upon an Officers' Certificate;





                                      -40-
<PAGE>   48

     (4)  the Trustee may consult with counsel and the written advice of such
counsel or any Opinion of Counsel shall be full and complete authorization and
protection in respect of any action taken, suffered or omitted by it hereunder
in good faith and in reliance thereon;

     (5)  the Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders pursuant to this Indenture, unless such Holders shall have
offered to the Trustee reasonable security or indemnity against the costs,
expenses and liabilities which might be incurred by it in compliance with such
request or direction;

     (6)  the Trustee shall not be bound to make any investigation into the
facts or matters stated in any resolution, certificate, statement, instrument,
opinion, report, notice, request, direction, consent, order, bond, debenture,
note, other evidence of indebtedness or other paper or document, but the
Trustee, in its discretion, may make such further inquiry or investigation into
such facts or matters as it may see fit, and, if the Trustee shall determine to
make such further inquiry or investigation, it shall be entitled to examine the
books, records and premises of the Company, personally or by agent or attorney;
and

     (7)  the Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder.

SECTION 604.   NOT RESPONSIBLE FOR RECITALS OR ISSUANCE OF SECURITIES.

     The recitals contained herein and in the Securities, except the Trustee's
certificates of authentication, shall be taken as the statements of the
Company, and neither the Trustee nor any Authenticating Agent assumes any
responsibility for their correctness.  The Trustee makes no representations as
to the validity or sufficiency of this Indenture or of the Securities.  Neither
the Trustee nor any Authenticating Agent shall be accountable for the use or
application by the Company of Securities or the proceeds thereof.

SECTION 605.   MAY HOLD SECURITIES AND ACT AS TRUSTEE UNDER OTHER INDENTURES.

     The Trustee, any Authenticating Agent, any Paying Agent, any Security
Registrar or any other agent of the Company, in its individual or any other
capacity, may become the owner or pledgee of Securities and, subject to
Sections 608 and 613, may otherwise deal with the Company with the same rights
it would have if it were not Trustee, Authenticating Agent, Paying Agent,
Security Registrar or such other agent.

     Subject to the limitations imposed by the Trust Indenture Act, nothing in
this Indenture shall prohibit the Trustee from becoming and acting as trustee
under other indentures under which other securities, or certificates of
interest of participation in other securities, of the Company are outstanding
in the same manner as if it were not Trustee hereunder.





                                      -41-
<PAGE>   49


SECTION 606.   MONEY HELD IN TRUST.

     Money held by the Trustee in trust hereunder need not be segregated from
other funds except to the extent required by law.  The Trustee shall be under
no liability for interest on any money received by it hereunder except as
otherwise agreed with the Company.

SECTION 607.   COMPENSATION AND REIMBURSEMENT.

     The Company agrees

     (1)  to pay to the Trustee from time to time reasonable compensation for
all services rendered by it hereunder (which compensation shall not be limited
by any provision of law in regard to the compensation of a trustee of an
express trust);

     (2)  except as otherwise expressly provided herein, to reimburse the
Trustee upon its request for all reasonable expenses, disbursements and
advances incurred or made by the Trustee in accordance with any provision of
this Indenture (including the reasonable compensation and the expenses and
disbursements of its agents and counsel), except any such expense, disbursement
or advance as may be attributable to its negligence or bad faith; and

     (3)  to indemnify the Trustee for, and to hold it harmless against, any
loss, liability or expense incurred without negligence or bad faith on its
part, arising out of or in connection with the acceptance or administration of
the trust or trusts hereunder, including the costs and expenses of defending
itself against any claim or liability in connection with the exercise or
performance of any of its powers or duties hereunder.

SECTION 608.   CONFLICTING INTERESTS.

     If the Trustee has or shall acquire a conflicting interest within the
meaning of the Trust Indenture Act, the Trustee shall either eliminate such
interest or resign, to the extent and in the manner provided by, and subject to
the provisions of, the Trust Indenture Act and this Indenture.  To the extent
permitted by such Act, the Trustee shall not be deemed to have a conflicting
interest by virtue of being a trustee under this Indenture with respect to
Securities of more than one series.

SECTION 609.   CORPORATE TRUSTEE REQUIRED; ELIGIBILITY.

     There shall at all times be one (and only one) Trustee hereunder with
respect to the Securities of each series, which may be Trustee hereunder for
Securities of one or more other series.  Each Trustee shall be a Person that is
eligible pursuant to the Trust Indenture Act to act as such and has (or if the
Trustee is a member of a bank holding company, its bank holding company has) a
combined capital and surplus of at least $50,000,000.  If any such Person
publishes reports of condition at least annually, pursuant to law or to the
requirements of its supervising or examining authority, then for the purposes
of this Section and to the extent permitted by the Trust Indenture Act, the
combined capital and surplus of such Person shall be deemed to be its combined
capital and





                                      -42-
<PAGE>   50

surplus as set forth in its most recent report of condition so published.  If
at any time the Trustee with respect to the Securities of any series shall
cease to be eligible in accordance with the provisions of this Section, it
shall resign immediately in the manner and with the effect hereinafter
specified in this Article.

SECTION 610.   RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR.

     No resignation or removal of the Trustee and no appointment of a successor
Trustee pursuant to this Article shall become effective until the acceptance of
appointment by the successor Trustee in accordance with the applicable
requirements of Section 611.

     The Trustee may resign at any time with respect to the Securities of one
or more series by giving written notice thereof to the Company.  If the
instrument of acceptance by a successor Trustee required by Section 611 shall
not have been delivered to the Trustee within 30 days after the giving of such
notice of resignation, the resigning Trustee may petition any court of
competent jurisdiction for the appointment of a successor Trustee with respect
to the Securities of such series.

     The Trustee may be removed at any time with respect to the Securities of
any series by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series, delivered to the Trustee and to the
Company.

     If at any time:

     (1)  the Trustee shall fail to comply with Section 608 after written
request therefor by the Company or by any Holder who has been a bona fide
Holder of a Security for at least six months, or

     (2)  the Trustee shall cease to be eligible under Section 609 and shall
fail to resign after written request therefor by the Company or by any such
Holder, or

     (3)  the Trustee shall become incapable of acting or shall be adjudged a
bankrupt or insolvent or a receiver of the Trustee or of its property shall be
appointed or any public officer shall take charge or control of the Trustee or
of its property or affairs for the purpose of rehabilitation, conservation or
liquidation,

then, in any such case, (A) the Company by a Board Resolution may remove the
Trustee with respect to all Securities, or (B) subject to Section 514, any
Holder who has been a bona fide Holder of a Security for at least six months
may, on behalf of himself and all others similarly situated, petition any court
of competent jurisdiction for the removal of the Trustee with respect to all
Securities and the appointment of a successor Trustee or Trustees.

     If the Trustee shall resign, be removed or become incapable of acting, or
if a vacancy shall occur in the office of Trustee for any cause, with respect
to the Securities of one or more series, the Company, by a Board Resolution,
shall promptly appoint a successor Trustee or Trustees with respect





                                      -43-
<PAGE>   51

to the Securities of that or those series (it being understood that any such
successor Trustee may be appointed with respect to the Securities of one or
more or all of such series and that at any time there shall be only one Trustee
with respect to the Securities of any particular series) and shall comply with
the applicable requirements of Section 611.  If, within one year after such
resignation, removal or incapability, or the occurrence of such vacancy, a
successor Trustee with respect to the Securities of any series shall be
appointed by Act of the Holders of a majority in principal amount of the
Outstanding Securities of such series delivered to the Company and the retiring
Trustee, the successor Trustee so appointed shall, forthwith upon its
acceptance of such appointment in accordance with the applicable requirements
of Section 611, become the successor Trustee with respect to the Securities of
such series and to that extent supersede the successor Trustee appointed by the
Company.  If no successor Trustee with respect to the Securities of any series
shall have been so appointed by the Company or the Holders and accepted
appointment in the manner required by Section 611, the retiring Trustee may
petition, or any Holder who has been a bona fide Holder of a Security of such
series for at least six months may, on behalf of himself and all others
similarly situated, petition any court of competent jurisdiction for the
appointment of a successor Trustee with respect to the Securities of such
series.

     The Company shall give notice of each resignation and each removal of the
Trustee with respect to the Securities of any series and each appointment of a
successor Trustee with respect to the Securities of any series to all Holders
of Securities of such series in the manner provided in Section 106.  Each
notice shall include the name of the successor Trustee with respect to the
Securities of such series and the address of its Corporate Trust Office.

SECTION 611.   ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.

     In case of the appointment hereunder of a successor Trustee with respect
to all Securities, every such successor Trustee so appointed shall execute,
acknowledge and deliver to the Company and to the retiring Trustee an
instrument accepting such appointment, and thereupon the resignation or removal
of the retiring Trustee shall become effective and such successor Trustee,
without any further act, deed or conveyance, shall become vested with all the
rights, powers, trusts and duties of the retiring Trustee; but, on the request
of the Company or the successor Trustee, such retiring Trustee shall, upon
payment of its charges, execute and deliver an instrument transferring to such
successor Trustee all the rights, powers and trusts of the retiring Trustee and
shall duly assign, transfer and deliver to such successor Trustee all property
and money held by such retiring Trustee hereunder.

     In case of the appointment hereunder of a successor Trustee with respect
to the Securities of one or more (but not all) series, the Company, the
retiring Trustee and each successor Trustee with respect to the Securities of
one or more series shall execute and deliver an indenture supplemental hereto
wherein each successor Trustee shall accept such appointment and which (1)
shall contain such provisions as shall be necessary or desirable to transfer
and confirm to, and to vest in, each successor Trustee all the rights, powers,
trusts and duties of the retiring Trustee with respect to the Securities of
that or those series to which the appointment of such successor Trustee
relates, (2) if the retiring Trustee is not retiring with respect to all
Securities, shall contain such provisions as shall be deemed





                                      -44-
<PAGE>   52

necessary or desirable to confirm that all the rights, powers, trusts and
duties of the retiring Trustee with respect to the Securities of that or those
series as to which the retiring Trustee is not retiring shall continue to be
vested in the retiring Trustee, and (3) shall add to or change any of the
provisions of this Indenture as shall be necessary to provide for or facilitate
the administration of the trusts hereunder by more than one Trustee, it being
understood that nothing herein or in such supplemental indenture shall
constitute such Trustees co-trustees of the same trust and that each such
Trustee shall be trustee of a trust or trusts hereunder separate and apart from
any trust or trusts hereunder administered by any other such Trustee; and upon
the execution and delivery of such supplemental indenture the resignation or
removal of the retiring Trustee shall become effective to the extent provided
therein and each such successor Trustee, without any further act, deed or
conveyance, shall become vested with all the rights, powers, trusts and duties
of the retiring Trustee with respect to the Securities of that or those series
to which the appointment of such successor Trustee relates; but, on request of
the Company or any successor Trustee, such retiring Trustee shall duly assign,
transfer and deliver to such successor Trustee all property and money held by
such retiring Trustee hereunder with respect to the Securities of that or those
series to which the appointment of such successor Trustee relates.

     Upon request of any such successor Trustee, the Company shall execute any
and all instruments for more fully and certainly vesting in and confirming to
such successor Trustee all such rights, powers and trusts referred to in the
first or second preceding paragraph, as the case may be.

     No successor Trustee shall accept its appointment unless at the time of
such acceptance such successor Trustee shall be qualified and eligible under
this Article.

SECTION 612.   MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO BUSINESS.

     Any corporation into which the Trustee may be merged or converted or with
which it may be consolidated, or any corporation resulting from any merger,
conversion or consolidation to which the Trustee shall be a party, or any
corporation succeeding to all or substantially all the corporate trust business
of the Trustee, shall be the successor of the Trustee hereunder, provided such
corporation shall be otherwise qualified and eligible under this Article,
without the execution or filing of any paper or any further act on the part of
any of the parties hereto.  In case any Securities shall have been
authenticated, but not delivered, by the Trustee then in office, any successor
by merger, conversion or consolidation to such authenticating Trustee may adopt
such authentication and deliver the Securities so authenticated with the same
effect as if such successor Trustee had itself authenticated such Securities.

SECTION 613.   PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.

     If and when the Trustee shall be or become a creditor of the Company (or
any other obligor upon the Securities), the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims
against the Company (or any such other obligor).

SECTION 614.   APPOINTMENT OF AUTHENTICATING AGENT.





                                      -45-
<PAGE>   53


     The Trustee may appoint an Authenticating Agent or Agents with respect to
one or more series of Securities which shall be authorized to act on behalf of
the Trustee to authenticate Securities of such series issued upon original
issue and upon exchange, registration of transfer or partial redemption thereof
or pursuant to Section 306, and Securities so authenticated shall be entitled
to the benefits of this Indenture and shall be valid and obligatory for all
purposes as if authenticated by the Trustee hereunder.  Wherever reference is
made in this Indenture to the authentication and delivery of Securities by the
Trustee or the Trustee's certificate of authentication, such reference shall be
deemed to include authentication and delivery on behalf of the Trustee by an
Authenticating Agent and a certificate of authentication executed on behalf of
the Trustee by an Authenticating Agent.  Each Authenticating Agent shall be
acceptable to the Company and shall at all times be a corporation organized and
doing business under the laws of the United States of America, any State
thereof or the District of Columbia, authorized under such laws to act as
Authenticating Agent, having (or if the Authenticating Agent is a member of a
bank holding company system, its bank holding company has) a combined capital
and surplus of not less than $50,000,000 and subject to supervision or
examination by Federal or State authority.  If such Authenticating Agent
publishes reports of condition at least annually, pursuant to law or to the
requirements of said supervising or examining authority, then for the purposes
of this Section, the combined capital and surplus of such Authenticating Agent
shall be deemed to be its combined capital and surplus as set forth in its most
recent report of condition so published.  If at any time an Authenticating
Agent shall cease to be eligible in accordance with the provisions of this
Section, such Authenticating Agent shall resign immediately in the manner and
with the effect specified in this Section.

     Any corporation into which an Authenticating Agent may be merged or
converted or with which it may be consolidated, or any corporation resulting
from any merger, conversion or consolidation to which such Authenticating Agent
shall be a party, or any corporation succeeding to the corporate agency or
corporate trust business of an Authenticating Agent, shall continue to be an
Authenticating Agent, provided such corporation shall be otherwise eligible
under this Section, without the execution or filing of any paper or any further
act on the part of the Trustee or the Authenticating Agent.

     An Authenticating Agent may resign at any time by giving written notice
thereof to the Trustee and to the Company.  The Trustee may at any time
terminate the agency of an Authenticating Agent by giving written notice
thereof to such Authenticating Agent and to the Company.  Upon receiving such a
notice of resignation or upon such a termination, or in case at any time such
Authenticating Agent shall cease to be eligible in accordance with the
provisions of this Section, the Trustee may appoint a successor Authenticating
Agent which shall be acceptable to the Company and shall give notice of such
appointment in the manner provided in Section 106 to all Holders of Securities
of the series with respect to which such Authenticating Agent will serve.  Any
successor Authenticating Agent upon acceptance of its appointment hereunder
shall become vested with all the rights, powers and duties of its predecessor
hereunder, with like effect as if originally named as an Authenticating Agent.
No successor Authenticating Agent shall be appointed unless eligible under the
provisions of this Section.





                                      -46-
<PAGE>   54

     The Trustee agrees to pay to each Authenticating Agent from time to time
reasonable compensation for its services under this Section, and the Trustee
shall be entitled to be reimbursed for such payments, subject to the provisions
of Section 607.

     If an appointment with respect to one or more series is made pursuant to
this Section 612, the Securities of such series may have endorsed thereon, in
addition to the Trustee's certificate of authentication, an alternative
certificate of authentication in the following form:

This is one of the Securities of the series designated therein referred to in
the within-mentioned Indenture.

                               LASALLE NATIONAL BANK
                               As Trustee

                               By: _______________________________,
                                    As Authenticating Agent

                               By: _______________________________
                                    Authorized Officer

                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.   COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF HOLDERS.

     The Company will furnish or cause to be furnished to the Trustee

     (1)  semi-annually, not later than 15 days after the Regular Record Date,
a list, in such form as the Trustee may reasonably require, of the names and
addresses of the Holders of Securities of each series as of such Regular Record
Date, as the case may be, and

     (2)  at such other times as the Trustee may request in writing, within 30
days after the receipt by the Company of any such request, a list of similar
form and content as of a date not more than 15 days prior to the time such list
is furnished;

provided that no such list need be furnished by the Company to the Trustee so
long as the Trustee is acting as Security Registrar.

SECTION 702.   PRESERVATION OF INFORMATION; COMMUNICATIONS TO HOLDERS.

     The Trustee shall preserve, in as current a form as is reasonably
practicable, the names and addresses of Holders contained in the most recent
list furnished to the Trustee as provided in Section 701 and the names and
addresses of Holders received by the Trustee in its capacity as Security
Registrar.  The Trustee may destroy any list furnished to it as provided in
Section 701 upon receipt of a new list so furnished.





                                      -47-
<PAGE>   55


     The rights of Holders to communicate with other Holders with respect to
their rights under this Indenture or under the Securities, and the
corresponding rights and privileges of the Trustee, shall be as provided by the
Trust Indenture Act.

     Every Holder of Securities, by receiving and holding the same, agrees with
the Company and the Trustee that neither the Company nor the Trustee nor any
agent of either of them shall be held accountable by reason of any disclosure
of information as to names and addresses of Holders made pursuant to the Trust
Indenture Act.

SECTION 703.   REPORTS BY TRUSTEE.

     The Trustee shall transmit to Holders such reports concerning the Trustee
and its actions under this Indenture as may be required pursuant to the Trust
Indenture Act at the times and in the manner provided pursuant thereto.

     Reports so required to be transmitted at stated intervals of not more than
12 months shall be transmitted no later than July 1 in each calendar year,
commencing with the first July 1 after the first issuance of Securities
pursuant to this Indenture.

     A copy of each such report shall, at the time of such transmission to
Holders, be filed by the Trustee with each stock exchange upon which any
Securities are listed, with the Commission and with the Company.  The Company
will notify the Trustee when any Securities are listed on any stock exchange.

SECTION 704.   REPORTS BY COMPANY.

     The Company shall file with the Trustee and the Commission, and transmit
to Holders, such information, documents and other reports, and such summaries
thereof, as may be required pursuant to the Trust Indenture Act at the times
and in the manner provided pursuant to the Trust Indenture Act; provided that
any such information, documents or reports required to be filed with the
Commission pursuant to Section 13 or 15(d) of the Exchange Act shall be filed
with the Trustee within 15 days after the same is so required to be filed with
the Commission.

                                 ARTICLE EIGHT

              CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.   COMPANY MAY CONSOLIDATE, ETC., ONLY ON CERTAIN TERMS.

     The Company shall not consolidate with or merge into any other Person (in
a transaction in which the Company is not the surviving corporation) or convey,
transfer or lease its properties and assets substantially as an entirety to any
Person, unless:





                                      -48-
<PAGE>   56

     (1)  in case the Company shall consolidate with or merge into another
Person (in a transaction in which the Company is not the surviving corporation)
or convey, transfer or lease its properties and assets substantially as an
entirety to any Person, the Person formed by such consolidation or into which
the Company is merged or the Person which acquires by conveyance or transfer,
or which leases, the properties and assets of the Company substantially as an
entirety shall be a corporation, limited liability company, partnership or
trust, shall be organized and validly existing under the laws of the United
States of America, any State thereof or the District of Columbia and shall
expressly assume, by an indenture supplemental hereto, executed and delivered
to the Trustee, in form satisfactory to the Trustee, the due and punctual
payment of the principal of and any premium and interest on all the Securities
and the performance or observance of every covenant of this Indenture on the
part of the Company to be performed or observed and the conversion rights shall
be provided for in accordance with Article Fourteen, if applicable, or as
otherwise specified pursuant to Section 301, by supplemental indenture
satisfactory in form to the Trustee, executed and delivered to the Trustee, by
the Person (if other than the Company) formed by such consolidation or into
which the Company shall have been merged or by the Person which shall have
acquired the Company's assets;

     (2)  immediately after giving effect to such transaction, no Event of
Default, and no event which, after notice or lapse of time or both, would
become an Event of Default, shall have happened and be continuing; and

     (3)  the Company has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel, each stating that such consolidation, merger,
conveyance, transfer or lease and, if a supplemental indenture is required in
connection with such transaction, such supplemental indenture comply with this
Article and that all conditions precedent herein provided for relating to such
transaction have been complied with.

SECTION 802.   SUCCESSOR SUBSTITUTED.

     Upon any consolidation of the Company with, or merger of the Company into,
any other Person or any conveyance, transfer or lease of the properties and
assets of the Company substantially as an entirety in accordance with Section
801, the successor Person formed by such consolidation or into which the
Company is merged or to which such conveyance, transfer or lease is made shall
succeed to, and be substituted for, and may exercise every right and power of,
the Company under this Indenture with the same effect as if such successor
Person had been named as the Company herein, and thereafter, except in the case
of a lease, the predecessor Person shall be relieved of all obligations and
covenants under this Indenture and the Securities.

                                  ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

SECTION 901.   SUPPLEMENTAL INDENTURES WITHOUT CONSENT OF HOLDERS.





                                      -49-
<PAGE>   57

     Without the consent of any Holders, the Company, when authorized by a
Board Resolution, and the Trustee, at any time and from time to time, may enter
into one or more indentures supplemental hereto, in form satisfactory to the
Trustee, for any of the following purposes:

     (1)  to evidence the succession of another Person to the Company, or
successive successions, and the assumption by any such successor of the
covenants of the Company herein and in the Securities; or

     (2)  to add to the covenants of the Company for the benefit of the Holders
of all or any series of Securities (and if such covenants are to be for the
benefit of less than all series of Securities, stating that such covenants are
expressly being included solely for the benefit of such series) or to surrender
any right or power herein conferred upon the Company; or

     (3)  to add any additional Events of Default for the benefit of the
Holders of all or any series of Securities (and if such additional Events of
Default are to be for the benefit of less than all series of Securities,
stating that such additional Events of Default are expressly being included
solely for the benefit of such series); or

     (4)  to add to or change any of the provisions of this Indenture to such
extent as shall be necessary to permit or facilitate the issuance of Securities
in bearer form, registrable or not registrable as to principal, and with or
without interest coupons, or to permit or facilitate the issuance of Securities
in uncertificated form; or

     (5)  to add to, change or eliminate any of the provisions of this
Indenture in respect of one or more series of Securities, provided that any
such addition, change or elimination (A) shall neither (i) apply to any
Security of any series created prior to the execution of such supplemental
indenture and entitled to the benefit of such provision nor (ii) modify the
rights of the Holder of any such Security with respect to such provision or (B)
shall become effective only when there is no such Security Outstanding; or

     (6)  to secure the Securities; or

     (7)  to establish the form or terms of Securities of any series as
permitted by Sections 201 and 301; or

     (8)  to evidence and provide for the acceptance of appointment hereunder
by a successor Trustee with respect to the Securities of one or more series and
to add to or change any of the provisions of this Indenture as shall be
necessary to provide for or facilitate the administration of the trusts
hereunder by more than one Trustee, pursuant to the requirements of Section
611; or

     (9)  to make provision with respect to the conversion rights of Holders
pursuant to the requirements of Article Fourteen, including providing for the
conversion of the securities into any security (other than the Common Stock of
the Company) or property of the Company; or





                                      -50-
<PAGE>   58

     (10) to cure any ambiguity, to correct or supplement any provision herein
which may be defective or inconsistent with any other provision herein, or to
make any other provisions with respect to matters or questions arising under
this Indenture, provided that such action pursuant to this Clause (10) shall
not adversely affect the interests of the Holders of Securities of any series
in any material respect; or

     (11) to supplement any of the provisions of the Indenture to such extent
as shall be necessary to permit or facilitate the defeasance and discharge of
any series of Securities pursuant to Articles Four and Thirteen, provided that
any such action shall not adversely affect the interests of the Holders of
Securities of such series or any other series of Securities in any material
respect.

SECTION 902.   SUPPLEMENTAL INDENTURES WITH CONSENT OF HOLDERS.

     With the consent of the Holders of a majority in principal amount of the
Outstanding Securities of each series affected by such supplemental indenture,
by Act of said Holders delivered to the Company and the Trustee, the Company,
when authorized by a Board Resolution, and the Trustee may enter into an
indenture or indentures supplemental hereto for the purpose of adding any
provisions to or changing in any manner or eliminating any of the provisions of
this Indenture or of modifying in any manner the rights of the Holders of
Securities of such series under this Indenture; provided, however, that no such
supplemental indenture shall, without the consent of the Holder of each
Outstanding Security affected thereby,

     (1)  change the Stated Maturity of the principal of, or any installment of
principal of or interest on, any Security, or reduce the principal amount
thereof or the rate of interest thereon or any premium thereof, or reduce the
amount of the principal of an Original Issue Discount Security or any other
Security which would be due and payable upon a declaration of acceleration of
the Maturity thereof pursuant to Section 502, or change any Place of Payment
where, or the coin or currency in which, of the principal of any Security or
any premium or interest thereon is payable, or impair the right to institute
suit for the enforcement of any such payment on or after the Stated Maturity
thereof (or, in the case of redemption, on or after the Redemption Date), or

     (2)  reduce the percentage in principal amount of the Outstanding
Securities of any series, the consent of whose Holders is required for any such
supplemental indenture, or the consent of whose Holders is required for any
waiver (of compliance with certain provisions of this Indenture or certain
defaults hereunder and their consequences) provided for in this Indenture, or

     (3)  modify any of the provisions of this Section, Section 513 or Section
1010, except to increase any such percentage or to provide that certain other
provisions of this Indenture cannot be modified or waived without the consent
of the Holder of each Outstanding Security affected thereby; provided, however,
that this clause shall not be deemed to require the consent of any Holder with
respect to changes in the references to "the Trustee" and concomitant changes
in this Section and Section 1010, or the deletion of this proviso, in
accordance with the requirements of Sections 611 and 901(8), or





                                      -51-
<PAGE>   59

     (4)  if applicable, make any change that adversely affects the right to
convert any security as provided in Article Fourteen or pursuant to Section 301
(except as permitted by Section 901(9)) or decrease the conversion rate or
increase the conversion price of any such security.

     A supplemental indenture which changes or eliminates any covenant or other
provision of this Indenture which has expressly been included solely for the
benefit of one or more particular series of Securities, or which modifies the
rights of the Holders of Securities of such series with respect to such
covenant or other provision, shall be deemed not to affect the rights under
this Indenture of the Holders of Securities of any other series.

     It shall not be necessary for any Act of Holders under this Section to
approve the particular form of any proposed supplemental indenture, but it
shall be sufficient if such Act shall approve the substance thereof.

SECTION 903.   EXECUTION OF SUPPLEMENTAL INDENTURES.

     In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article or the modifications thereby
of the trusts created by this Indenture, the Trustee shall be entitled to
receive, and (subject to Sections 601 and 603) shall be fully protected in
relying upon, an Opinion of Counsel stating that the execution of such
supplemental indenture is authorized or permitted by this Indenture.  The
Trustee may, but shall not be obligated to, enter into any such supplemental
indenture which affects the Trustee's own rights, duties or immunities under
this Indenture or otherwise.

SECTION 904.   EFFECT OF SUPPLEMENTAL INDENTURES.

     Upon the execution of any supplemental indenture under this Article, this
Indenture shall be modified in accordance therewith, and such supplemental
indenture shall form a part of this Indenture for all purposes; and every
Holder of Securities theretofore or thereafter authenticated and delivered
hereunder shall be bound thereby.

SECTION 905.   CONFORMITY WITH TRUST INDENTURE ACT.

     Every supplemental indenture executed pursuant to this Article shall
conform to the requirements of the Trust Indenture Act.

SECTION 906.   REFERENCE IN SECURITIES TO SUPPLEMENTAL INDENTURES.

     Securities of any series authenticated and delivered after the execution
of any supplemental indenture pursuant to this Article may, and shall if
required by the Trustee, bear a notation in form approved by the Trustee as to
any matter provided for in such supplemental indenture.  If the Company shall
so determine, new Securities of any series so modified as to conform, in the
opinion of the Trustee and the Company, to any such supplemental indenture may
be prepared and executed





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<PAGE>   60

by the Company and authenticated and delivered by the Trustee in exchange for
Outstanding Securities of such series.

                                  ARTICLE TEN

                                   COVENANTS

SECTION 1001.  PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST.

     The Company covenants and agrees for the benefit of each series of
Securities that it will duly and punctually pay the principal of and any
premium and interest on the Securities of that series in accordance with the
terms of the Securities and this Indenture.

SECTION 1002.  MAINTENANCE OF OFFICE OR AGENCY.

     The Company will maintain in each Place of Payment for any series of
Securities an office or agency where Securities of that series may be presented
or surrendered for payment, where Securities of that series may be surrendered
for registration of transfer or exchange, where Securities of that series may
be surrendered for conversion and where notices and demands to or upon the
Company in respect of the Securities of that series and this Indenture may be
served.  The Company will give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency.  If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee, and the Company hereby appoints the Trustee as its agent
to receive all such presentations, surrenders, notices and demands.  Unless
otherwise provided in a supplemental indenture or pursuant to Section 301
hereof, the Place of Payment for any series of Securities shall be the
Corporate Trust Office of the Trustee.

     The Company may also from time to time designate one or more other offices
or agencies where the Securities of one or more series may be presented or
surrendered for any or all such purposes and may from time to time rescind such
designations; provided, however, that no such designation or rescission shall
in any manner relieve the Company of its obligation to maintain an office or
agency in each Place of Payment for Securities of any series for such purposes.
The Company will give prompt written notice to the Trustee of any such
designation or rescission and of any change in the location of any such other
office or agency.

SECTION 1003.  MONEY FOR SECURITIES PAYMENTS TO BE HELD IN TRUST.

     If the Company shall at any time act as its own Paying Agent with respect
to any series of Securities, it will, on or before each due date of the
principal of or any premium or interest on any of the Securities of that
series, segregate and hold in trust for the benefit of the Persons entitled
thereto a sum sufficient to pay the principal and any premium and interest so
becoming due until





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<PAGE>   61

such sums shall be paid to such Persons or otherwise disposed of as herein
provided and will promptly notify the Trustee of its action or failure so to
act.

     Whenever the Company shall have one or more Paying Agents for any series
of Securities, it will, on or prior to each due date of the principal of or any
premium or interest on any Securities of that series, deposit with a Paying
Agent a sum sufficient to pay such amount, such sum to be held as provided by
the Trust Indenture Act, and (unless such Paying Agent is the Trustee) the
Company will promptly notify the Trustee of its action or failure so to act.

     The Company will cause each Paying Agent for any series of Securities
other than the Trustee to execute and deliver to the Trustee an instrument in
which such Paying Agent shall agree with the Trustee, subject to the provisions
of this Section, that such Paying Agent will (1) comply with the provisions of
the Trust Indenture Act applicable to it as a Paying Agent and (2) during the
continuance of any default by the Company (or any other obligor upon the
Securities of that series) in the making of any payment in respect of the
Securities of that series, upon the written request of the Trustee, forthwith
pay to the Trustee all sums held in trust by such Paying Agent for payment in
respect of the Securities of that series.

     The Company may at any time, for the purpose of obtaining the satisfaction
and discharge of this Indenture or for any other purpose, pay, or by Company
Order direct any Paying Agent to pay, to the Trustee all sums held in trust by
the Company or such Paying Agent, such sums to be held by the Trustee upon the
same trusts as those upon which such sums were held by the Company or such
Paying Agent; and, upon such payment by any Paying Agent to the Trustee, such
Paying Agent shall be released from all further liability with respect to such
money.

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Company, in trust for the payment of the principal of or any premium or
interest on any Security of any series and remaining unclaimed for a period
ending on the earlier of the date that is ten Business Days prior to the date
such money would escheat to the State or two years after such principal,
premium or interest has become due and payable shall be paid to the Company on
Company Request, or (if then held by the Company) shall be discharged from such
trust; and the Holder of such Security shall thereafter, as an unsecured
general creditor, look only to the Company for payment thereof, and all
liability of the Trustee or such Paying Agent with respect to such trust money,
and all liability of the Company as trustee thereof, shall thereupon cease;
provided, however, that the Trustee or such Paying Agent, before being required
to make any such repayment, may at the expense of the Company cause to be
published once, in a newspaper published in the English language, customarily
published on each Business Day and of general circulation in each Place of
Payment, notice that such money remains unclaimed and that, after a date
specified therein, which shall not be less than 30 days from the date of such
publication, any unclaimed balance of such money then remaining will be repaid
to the Company.

SECTION 1004.  STATEMENT BY OFFICERS AS TO DEFAULT.





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<PAGE>   62

     The Company will deliver to the Trustee, within 120 days after the end of
each fiscal year of the Company ending after the date hereof, an Officers'
Certificate, stating whether or not to the best knowledge of the signers
thereof the Company is in default in the performance and observance of any of
the terms, provisions and conditions of this Indenture (without regard to any
period of grace or requirement of notice provided hereunder) and, if the
Company shall be in default, specifying all such defaults and the nature and
status thereof of which they may have knowledge.  The fiscal year of the
Company currently ends on March 31; and the Company will give prompt written
notice of any change of its fiscal year.

SECTION 1005.  EXISTENCE.

     Subject to Article Eight, the Company will do or cause to be done all
things necessary to preserve and keep in full force and effect its existence.

SECTION 1006.  MAINTENANCE OF PROPERTIES.

     The Company will cause all properties used or useful in the conduct of its
business to be maintained and kept in good condition, repair and working order
and supplied with all necessary equipment and will cause to be made all
necessary repairs, renewals, replacements, betterments and improvements
thereof, all as, and to the extent, in the judgment of the Company may be
necessary so that the business carried on in connection therewith may be
properly and advantageously conducted at all times; provided, however, that
nothing in this Section shall prevent the Company from discontinuing the
operation or maintenance of any of such properties if such discontinuance is,
in the judgment of the Company, desirable in the conduct of its business and
not disadvantageous in any material respect to the Holders.

SECTION 1007.  PAYMENT OF TAXES AND OTHER CLAIMS.

     The Company will pay or discharge or cause to be paid or discharged,
before the same shall become delinquent, (1) all taxes, assessments and
governmental charges levied or imposed upon the Company upon the income,
profits or property of the Company, and (2) all lawful claims for labor,
materials and supplies which, if unpaid, might by law become a lien upon the
property of the Company; provided, however, that the Company shall not be
required to pay or discharge or cause to be paid or discharged any such tax,
assessment, charge or claim (i) whose amount, applicability or validity is
being contested in good faith by appropriate proceedings or (ii) if the failure
to pay or discharge would not have a material adverse effect on the assets,
business, operations, properties or condition (financial or otherwise) of the
Company and its Subsidiaries taken, as a whole.

SECTION 1008.  LIMITATION ON LIENS.

     The Company will not issue, incur, create, assume or guarantee, and will
not permit any Restricted Subsidiary to issue, incur, create, assume or
guarantee, any debt for borrowed money secured by a mortgage, security
interest, pledge, lien, charge or other encumbrance ("mortgages") upon any
Principal Property of the Company or any Restricted Subsidiary or upon any
shares of





                                      -55-
<PAGE>   63

stock or indebtedness of any Restricted Subsidiary (whether such Principal
Property, shares or indebtedness are now existing or owned or hereafter created
or acquired) without in any such case effectively providing concurrently with
issuance, incurrence, creation, assumption or guarantee of any such secured
debt, or the grant of a mortgage with respect to any such indebtedness, that
the Securities (together with, if the Company shall so determine, any other
indebtedness of or guarantee by the Company or such Restricted Subsidiary
ranking equally with the Securities) shall be secured equally and ratably with
(or, at the option of the Company, prior to) such secured debt.  The foregoing
restriction, however, will not apply to:

     (1)  mortgages on property existing at the time of acquisition thereof by
the Company or any Subsidiary, provided that such mortgages were in existence
prior to the contemplation of such acquisitions;

     (2)  mortgages on property, shares of stock or indebtedness or other
assets of any corporation existing at the time such corporation becomes a
Restricted Subsidiary, provided that such mortgages are not incurred in
anticipation of such corporation becoming a Restricted Subsidiary (which may
include property previously leased by the Company and leasehold interests
thereon, provided that the lease terminates prior to or upon the acquisition);

     (3)  mortgages on property, shares of stock or indebtedness existing at
the time of acquisition thereof by the Company or a Subsidiary or mortgages
thereon to secure the payment of all or any part of the purchase price thereof,
or mortgages on property, shares of stock or indebtedness to secure any
indebtedness for borrowed money incurred prior to, at the time of or within 270
days after, the latest of the acquisition thereof, or, in the case of property,
the completion of construction, the completion of improvements, or the
commencement of substantial commercial operation of such property for the
purpose of financing all or any part of the purchase price thereof, such
construction, or the making of such improvements;

     (4)  mortgages to secure indebtedness owing to the Company or to a
Restricted Subsidiary:

     (5)  mortgages existing at the date of this Indenture;

     (6)  mortgages on property of a corporation existing at the time such
corporation is merged into or consolidated with the Company or a Subsidiary or
at the time of a sale, lease or other disposition of the properties of a
corporation as an entirety or substantially as an entirety to the Company or a
Restricted Subsidiary, provided that such mortgage was not incurred in
anticipation of such merger or consolidation or sale, lease or other
disposition;

     (7)  mortgages in favor of the United States or any State, territory or
possession thereof (or the District of Columbia), or any department, agency,
instrumentality or political subdivision of the United States or any State,
territory or possession thereof (or the District of Columbia), to secure
partial, progress, advance or other payments pursuant to any contract or
statute or to secure any indebtedness incurred for the purpose of financing all
or any part of the purchase price of the cost of constructing or improving the
property subject to such mortgages;





                                      -56-
<PAGE>   64


     (8)  mortgages created in connection with the acquisition of assets or a
project financed with, and created to secure, a Nonrecourse Obligation;

     (9)  extensions, renewals, refinancings or replacements of any mortgage
referred to in the foregoing clauses (1), (2), (3), (4), (5), (6), (7) and (8)
provided, however, that any mortgages permitted by any of the foregoing clauses
(1), (2), (3), (4), (5), (6), (7) and (8) shall not extend to or cover any
property of the Company or such Restricted Subsidiary, as the case may be,
other than the property, if any, specified in such clauses and improvements
thereto, and provided further that any refinancing or replacement of any
mortgages permitted by the foregoing clauses (7) and (8) shall be of the type
referred to in such clauses (7) or (8), as the case may be.

     Notwithstanding the restrictions set forth in the preceding paragraph, the
Company or any Restricted Subsidiary will be permitted to issue, incur, create,
assume or guarantee debt secured by a mortgage which would otherwise be subject
to such restrictions, without equally and ratably securing the Securities,
provided that after giving effect thereto, the aggregate amount of all debt so
secured by mortgages (not including mortgages permitted under clauses (1)
through (10) above) does not exceed 10% of the Consolidated Net Tangible Assets
of the Company.

SECTION 1009.  LIMITATIONS ON SALE AND LEASEBACK TRANSACTIONS.

     The Company will not, nor will it permit any Restricted Subsidiary to,
enter into any Sale and Lease-Back Transaction with respect to any Principal
Property, other than any such transaction involving a lease for a term of not
more than three years of any such transaction between the Company and a
Restricted Subsidiary or between Restricted Subsidiaries, unless: (1) the
Company or such Restricted Subsidiary would be entitled to incurs indebtedness
secured by a mortgage on the Principal Property involved in such transaction at
least equal in amount to the Attributable Debt with respect to such Sale and
Lease-Back Transaction, without equally and ratably securing the Securities,
pursuant to Section 1008; or (2) the Company shall apply an amount equal to the
greater of the net proceeds of such sale or the Attributable Debt with respect
to such Sale and Lease-Back Transaction within 180 days of such sale to either
(or a combination of) the retirement (other than mandatory retirement,
mandatory prepayment or sinking fund payment or by a payment at maturity) of
debt for borrowed money of the Company or a Restricted Subsidiary that matures
more than 12 months after the creation of such indebtedness or the purchase,
construction or development of other comparable property.

     Notwithstanding the restrictions outlined in the preceding paragraph, the
Company or any Restricted Subsidiary will be permitted to enter into Sale and
Lease-Back Transactions which would otherwise be subject to such restrictions,
without applying the net proceeds of such transactions in the manner set forth
in clause (2) above, provided that after giving effect thereto, the aggregate
amount of such Sale and Lease-Back Transactions, together with the aggregate
amount of all debt secured by mortgages not permitted by clauses (a) through
(i) of section 1008, does not exceed 10% of the Consolidated Net Tangible
Assets of the Company.

SECTION 1010.  WAIVER OF CERTAIN COVENANTS.





                                      -57-
<PAGE>   65


     Except as otherwise specified as contemplated by Section 301 for
Securities of such series, the Company may, with respect to the Securities of
any series, omit in any particular instance to comply with any term, provision
or condition set forth in any covenant provided pursuant to Section 301(19),
901(2), 901(7), 1006, 1007, 1008 or 1009 for the benefit of the Holders of such
series if before the time for such compliance the Holders of at least a
majority in principal amount of the Outstanding Securities of such series
shall, by Act of such Holders, either waive such compliance in such instance or
generally waive compliance with such term, provision or condition, but no such
waiver shall extend to or affect such term, provision or condition except to
the extent so expressly waived, and, until such waiver shall become effective,
the obligations of the Company and the duties of the Trustee in respect of any
such term, provision or condition shall remain in full force and effect.

                                 ARTICLE ELEVEN

                            REDEMPTION OF SECURITIES

SECTION 1101.  APPLICABILITY OF ARTICLE.

     Securities of any series which are redeemable before their Stated Maturity
shall be redeemable in accordance with their terms and (except as otherwise
specified as contemplated by Section 301 for such Securities) in accordance
with this Article.

SECTION 1102.  ELECTION TO REDEEM; NOTICE TO TRUSTEE.

     The election of the Company to redeem any Securities shall be evidenced by
a Board Resolution or in another manner specified as contemplated by Section
301 for such Securities.  In case of any redemption at the election of the
Company of less than all the Securities of any series (including any such
redemption affecting only a single Security), the Company shall, at least 45
days prior to the Redemption Date fixed by the Company (unless a shorter notice
shall be satisfactory to the Trustee), notify the Trustee of such Redemption
Date, of the principal amount of Securities of such series to be redeemed and,
if applicable, of the tenor of the Securities to be redeemed.  In the case of
any redemption of Securities prior to the expiration of any restriction on such
redemption provided in the terms of such Securities or elsewhere in this
Indenture, the Company shall furnish the Trustee with an Officers' Certificate
evidencing compliance with such restriction.

SECTION 1103.  SELECTION BY TRUSTEE OF SECURITIES TO BE REDEEMED.

     If less than all the Securities of any series are to be redeemed (unless
all the Securities of such series and of a specified tenor are to be redeemed
or unless such redemption affects only a single Security), the particular
Securities to be redeemed shall be selected not more than 45 days prior to the
Redemption Date by the Trustee, from the Outstanding Securities of such series
not previously called for redemption, by lot, or in the Trustee's discretion,
on a pro-rata basis, provided that the unredeemed portion of the principal
amount of any Security shall be in an authorized denomination (which shall not
be less than the minimum authorized denomination) for such Security.  If less
than





                                      -58-
<PAGE>   66

all the Securities of such series and of a specified tenor are to be redeemed
(unless such redemption affects only a single Security), the particular
Securities to be redeemed shall be selected not more than 45 days prior to the
Redemption Date by the Trustee, from the Outstanding Securities of such series
and specified tenor not previously called for redemption in accordance with the
preceding sentence.

     If any Security selected for partial redemption is converted in part
before termination of the conversion right with respect to the portion of the
Security so selected, the converted portion of such Security shall be deemed
(so far as may be) to be the portion selected for redemption.  Securities which
have been converted during a selection of Securities to be redeemed shall be
treated by the Trustee as Outstanding for the purpose of such selection.

     The Trustee shall promptly notify the Company in writing of the Securities
selected for redemption as aforesaid and, in case of any Securities selected
for partial redemption as aforesaid, the principal amount thereof to be
redeemed.

     The provisions of the two preceding paragraphs shall not apply with
respect to any redemption affecting only a single Security, whether such
Security is to be redeemed in whole or in part.  In the case of any such
redemption in part, the unredeemed portion of the principal amount of the
Security shall be in an authorized denomination (which shall not be less than
the minimum authorized denomination) for such Security.

     For all purposes of this Indenture, unless the context otherwise requires,
all provisions relating to the redemption of Securities shall relate, in the
case of any Securities redeemed or to be redeemed only in part, to the portion
of the principal amount of such Securities which has been or is to be redeemed.

SECTION 1104.  NOTICE OF REDEMPTION.

     Notice of redemption shall be given by first-class mail, postage prepaid,
mailed not less than 30 nor more than 60 days prior to the Redemption Date,
unless a shorter period is specified in the Securities to be redeemed, to each
Holder of Securities to be redeemed, at its address appearing in the Security
Register.

     All notices of redemption shall state:

     (1)  the Redemption Date,

     (2)  the Redemption Price (including accrued interest, if any),

     (3)  if less than all the Outstanding Securities of any series consisting
of more than a single Security are to be redeemed, the identification (and, in
the case of partial redemption of any such Securities, the principal amounts)
of the particular Securities to be redeemed and, if less than all the





                                      -59-
<PAGE>   67

Outstanding Securities of any series consisting of a single Security are to be
redeemed, the principal amount of the particular Security to be redeemed,

     (4)  that on the Redemption Date the Redemption Price will become due and
payable upon each such Security to be redeemed and, if applicable, that
interest thereon will cease to accrue on and after said date,

     (5)  the place or places where each such Security is to be surrendered for
payment of the Redemption Price,

     (6)  if applicable, the conversion price, that the date on which the right
to convert the principal of the Securities or the portions thereof to be
redeemed will terminate will be the Redemption Date and the place or places
where such Securities may be surrendered for conversion, and

     (7)  that the redemption is for a sinking fund, if such is the case.

     Notice of redemption of Securities to be redeemed at the election of the
Company shall be given by the Company or, at the Company's request, by the
Trustee in the name and at the expense of the Company and shall be irrevocable.

SECTION 1105.  DEPOSIT OF REDEMPTION PRICE.

     On or prior to any Redemption Date, the Company shall deposit with the
Trustee or with a Paying Agent (or, if the Company is acting as its own Paying
Agent, segregate and hold in trust as provided in Section 1003) an amount of
money sufficient to pay the Redemption Price of, and (except if the Redemption
Date shall be an Interest Payment Date) accrued interest on, all the Securities
which are to be redeemed on that date.

     If any Security called for redemption is converted, any money deposited
with the Trustee or with a Paying Agent or so segregated and held in trust for
the redemption of such Security shall (subject to the right of any Holder of
such Security to receive interest as provided in the last paragraph of Section
307) be paid to the Company on Company Request, or if then held by the Company,
shall be discharged from such trust.

SECTION 1106.  SECURITIES PAYABLE ON REDEMPTION DATE.

     Notice of redemption having been given as aforesaid, the Securities so to
be redeemed shall, on the Redemption Date, become due and payable at the
Redemption Price therein specified, and from and after such date (unless the
Company shall default in the payment of the Redemption Price and accrued
interest) such Securities shall cease to bear interest.  Upon surrender of any
such Security for redemption in accordance with said notice, such Security
shall be paid by the Company at the Redemption Price, together with accrued
interest to the Redemption Date; provided, however, that, unless otherwise
specified as contemplated by Section 301, installments of interest whose Stated





                                      -60-
<PAGE>   68

Maturity is on or prior to the Redemption Date will be payable to the Holders
of such Securities, or one or more Predecessor Securities, registered as such
at the close of business on the relevant Record Dates according to their terms
and the provisions of Section 307.

     If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal and any premium shall, until paid, bear
interest from the Redemption Date at the rate prescribed therefor in the
Security.

SECTION 1107.  SECURITIES REDEEMED IN PART.

     Any Security which is to be redeemed only in part shall be surrendered at
a Place of Payment therefor (with, if the Company or the Trustee so requires,
due endorsement by, or a written instrument of transfer in form satisfactory to
the Company and the Trustee duly executed by, the Holder thereof or its
attorney duly authorized in writing), and the Company shall execute, and the
Trustee shall authenticate and deliver to the Holder of such Security without
service charge, a new Security or Securities of the same series and of like
tenor, of any authorized denomination as requested by such Holder, in aggregate
principal amount equal to and in exchange for the unredeemed portion of the
principal of the Security so surrendered.

                                 ARTICLE TWELVE

                                 SINKING FUNDS

SECTION 1201.  APPLICABILITY OF ARTICLE.

     The provisions of this Article shall be applicable to any sinking fund for
the retirement of Securities of any series except as otherwise specified as
contemplated by Section 301 for such Securities.

     The minimum amount of any sinking fund payment provided for by the terms
of any Securities is herein referred to as a "mandatory sinking fund payment,"
and any payment in excess of such minimum amount provided for by the terms of
such Securities is herein referred to as an "optional sinking fund payment."
If provided for by the terms of any Securities, the cash amount of any sinking
fund payment may be subject to reduction as provided in Section 1202.  Each
sinking fund payment shall be applied to the redemption of Securities as
provided for by the terms of such Securities.

SECTION 1202.  SATISFACTION OF SINKING FUND PAYMENTS WITH SECURITIES.

     The Company (1) may deliver Outstanding Securities of a series (other than
any previously called for redemption) and (2) may apply as a credit Securities
of a series which have been redeemed either at the election of the Company
pursuant to the terms of such Securities or through the application of
permitted optional sinking fund payments pursuant to the terms of such
Securities, in each case in satisfaction of all or any part of any sinking fund
payment with respect to any Securities





                                      -61-
<PAGE>   69

of such series required to be made pursuant to the terms of such Securities as
and to the extent provided for by the terms of such Securities; provided that
the Securities to be so credited have not been previously so credited.  The
Securities to be so credited shall be received and credited for such purpose by
the Trustee at the Redemption Price, as specified in the Securities so to be
redeemed, for redemption through operation of the sinking fund and the amount
of such sinking fund payment shall be reduced accordingly.

SECTION 1203.  REDEMPTION OF SECURITIES FOR SINKING FUND.

     Not less than 60 days prior to each sinking fund payment date for any
Securities, the Company will deliver to the Trustee an Officers' Certificate
specifying the amount of the next ensuing sinking fund payment for such
Securities pursuant to the terms of such Securities, the portion thereof, if
any, which is to be satisfied by payment of cash and the portion thereof, if
any, which is to be satisfied by delivering and crediting Securities pursuant
to Section 1202 and will also deliver to the Trustee any Securities to be so
delivered.  Not less than 30 days prior to each such sinking fund payment date,
the Trustee shall select the Securities to be redeemed upon such sinking fund
payment date in the manner specified in Section 1103 and cause notice of the
redemption thereof to be given in the name of and at the expense of the Company
in the manner provided in Section 1104.  Such notice having been duly given,
the redemption of such Securities shall be made upon the terms and in the
manner stated in Sections 1106 and 1107.

                                ARTICLE THIRTEEN

                       DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1301.  COMPANY'S OPTION TO EFFECT DEFEASANCE OR COVENANT DEFEASANCE.

     The Company may elect, at its option at any time, to have Section 1302 or
Section 1303 applied to any Securities or any series of Securities, as the case
may be, designated pursuant to Section 301 as being defeasible pursuant to such
Section 1302 or 1303, in accordance with any applicable requirements provided
pursuant to Section 301 and upon compliance with the conditions set forth below
in this Article.  Any such election shall be evidenced by a Board Resolution or
in another manner specified as contemplated by Section 301 for such Securities.

SECTION 1302.  DEFEASANCE AND DISCHARGE.

     Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, the
Company shall be deemed to have been discharged from its obligations with
respect to such Securities as provided in this Section on and after the date
the conditions set forth in Section 1304 are satisfied (hereinafter called
"Defeasance").  For this purpose, such Defeasance means that the Company shall
be deemed to have paid and discharged the entire indebtedness represented by
such Securities and to have satisfied all its other obligations under such
Securities and this Indenture insofar as such Securities are concerned (and the
Trustee, at the expense of the Company, shall execute proper instruments
acknowledging the same), subject





                                      -62-
<PAGE>   70

to the following which shall survive until otherwise terminated or discharged
hereunder: (1) the rights of Holders of such Securities to receive, solely from
the trust fund described in Section 1304 and as more fully set forth in such
Section, payments in respect of the principal of and any premium and interest
on such Securities when payments are due, (2) the Company's obligations with
respect to such Securities under Sections 304, 305, 306, 1002 and 1003, and, if
applicable, Article Fourteen, (3) the rights, powers, trusts, duties and
immunities of the Trustee hereunder and (4) this Article.  Subject to
compliance with this Article, the Company may exercise its option (if any) to
have this Section applied to any Securities notwithstanding the prior exercise
of its option (if any) to have Section 1303 applied to such Securities.

SECTION 1303.  COVENANT DEFEASANCE.

     Upon the Company's exercise of its option (if any) to have this Section
applied to any Securities or any series of Securities, as the case may be, (1)
the Company shall be released from its obligations under Sections 1006 through
1009, inclusive, and any covenants provided pursuant to Section 301(19), 901(2)
or 901(7) for the benefit of the Holders of such Securities and (2) the
occurrence of any event specified in Sections 501(4), Sections 1006 through
1009, inclusive, and any such covenants provided pursuant to Section 301(19),
901(2) or 901(7)) shall be deemed not to be or result in an Event of Default,
in each case with respect to such Securities as provided in this Section on and
after the date the conditions set forth in Section 1304 are satisfied
(hereinafter called "Covenant Defeasance").  For this purpose, such Covenant
Defeasance means that, with respect to such Securities, the Company may omit to
comply with and shall have no liability in respect of any term, condition or
limitation set forth in any such specified Section (to the extent so specified
in the case of Section 501(4)), whether directly or indirectly by reason of any
reference elsewhere herein to any such Section or by reason of any reference in
any such Section to any other provision herein or in any other document, but
the remainder of this Indenture and such Securities shall be unaffected
thereby.

SECTION 1304.  CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE.

     The following shall be the conditions to the application of Section 1302
or Section 1303 to any Securities or any series of Securities, as the case may
be:

     (1)  The Company shall irrevocably have deposited or caused to be
deposited with the Trustee (or another trustee which satisfies the requirements
contemplated by Section 609 and agrees to comply with the provisions of this
Article applicable to it) as trust funds in trust for the purpose of making the
following payments, specifically pledged as security for, and dedicated solely
to, the benefits of the Holders of such Securities, (A) money in an amount, or
(B) U.S. Government Obligations which through the scheduled payment of
principal and interest in respect thereof in accordance with their terms will
provide, not later than one day before the due date of any payment, money in an
amount, or (C) a combination thereof, in each case sufficient, in the opinion
of a nationally recognized firm of independent public accountants expressed in
a written certification thereof delivered to the Trustee, to pay and discharge,
and which shall be applied by the Trustee (or any such other qualifying
trustee) to pay and discharge, the principal of and any premium and interest





                                      -63-
<PAGE>   71

on such Securities on the respective Stated Maturities, in accordance with the
terms of this Indenture and such Securities.  As used herein, "U.S. Government
Obligation" means (x) any security which is (i) a direct obligation of the
United States of America for the payment of which the full faith and credit of
the United States of America is pledged or (ii) an obligation of a Person
controlled or supervised by and acting as an agency or instrumentality of the
United States of America the payment of which is unconditionally guaranteed as
a full faith and credit obligation by the United States of America, which, in
either case (i) or (ii), is not callable or redeemable at the option of the
issuer thereof, and (y) any depositary receipt issued by a bank (as defined in
Section 3(a)(2) of the Securities Act) as custodian with respect to any U.S.
Government Obligation which is specified in Clause (x) above and held by such
bank for the account of the holder of such depositary receipt, or with respect
to any specific payment of principal of or interest on any U.S. Government
Obligation which is so specified and held, provided that (except as required by
law) such custodian is not authorized to make any deduction from the amount
payable to the holder of such depositary receipt from any amount received by
the custodian in respect of the U.S. Government Obligation or the specific
payment of principal or interest evidenced by such depositary receipt.

     (2)  In the event of an election to have Section 1302 apply to any
Securities or any series of Securities, as the case may be, the Company shall
have delivered to the Trustee an Opinion of Counsel stating that (A) the
Company has received from, or there has been published by, the Internal Revenue
Service a ruling or (B) since the date of this instrument, there has been a
change in the applicable Federal income tax law, in either case (A) or (B) to
the effect that, and based thereon such opinion shall confirm that, the Holders
of such Securities will not recognize gain or loss for Federal income tax
purposes as a result of the deposit, Defeasance and discharge to be effected
with respect to such Securities and will be subject to Federal income tax on
the same amount, in the same manner and at the same times as would be the case
if such deposit, Defeasance and discharge were not to occur.

     (3)  In the event of an election to have Section 1303 apply to any
Securities or any series of Securities, as the case may be, the Company shall
have delivered to the Trustee an Opinion of Counsel to the effect that the
Holders of such Securities will not recognize gain or loss for Federal income
tax purposes as a result of the deposit and Covenant Defeasance to be effected
with respect to such Securities and will be subject to Federal income tax on
the same amount, in the same manner and at the same times as would be the case
if such deposit and Covenant Defeasance were not to occur.

     (4)  The Company shall have delivered to the Trustee an Officers'
Certificate to the effect that neither such Securities nor any other Securities
of the same series, if then listed on any securities exchange, will be delisted
as a result of such deposit.

     (5)  No event which is, or after notice or lapse of time or both would
become, an Event of Default with respect to such Securities or any other
Securities shall have occurred and be continuing at the time of such deposit
or, with regard to any such event specified in Sections 501(5) and (6), at any
time on or prior to the 90th day after the date of such deposit (it being
understood that this condition shall not be deemed satisfied until after such
90th day).





                                      -64-
<PAGE>   72


     (6)  Such Defeasance or Covenant Defeasance shall not cause the Trustee to
have a conflicting interest within the meaning of the Trust Indenture Act
(assuming all Securities are in default within the meaning of such Act).

     (7)  Such Defeasance or Covenant Defeasance shall not result in a breach
or violation of, or constitute a default under, any other agreement or
instrument to which the Company is a party or by which it is bound.

     (8)  Such Defeasance or Covenant Defeasance shall not result in the trust
arising from such deposit constituting an investment company within the meaning
of the Investment Company Act unless such trust shall be registered under such
Act or exempt from registration thereunder.

     (9)  The Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent with respect to such Defeasance or Covenant Defeasance have been
complied with.

SECTION 1305.  DEPOSITED MONEY AND U.S. GOVERNMENT OBLIGATIONS TO BE HELD IN
TRUST; MISCELLANEOUS PROVISIONS.

     Subject to the provisions of the last paragraph of Section 1003, all money
and U.S. Government Obligations (including the proceeds thereof) deposited with
the Trustee or other qualifying trustee (solely for purposes of this Section
and Section 1306, the Trustee and any such other trustee are referred to
collectively as the "Trustee") pursuant to Section 1304 in respect of any
Securities shall be held in trust and applied by the Trustee, in accordance
with the provisions of such Securities and this Indenture, to the payment,
either directly or through any such Paying Agent (including the Company acting
as its own Paying Agent) as the Trustee may determine, to the Holders of such
Securities, of all sums due and to become due thereon in respect of principal
and any premium and interest, but money so held in trust need not be segregated
from other funds except to the extent required by law.

     The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the U.S. Government Obligations
deposited pursuant to Section 1304 or the principal and interest received in
respect thereof other than any such tax, fee or other charge which by law is
for the account of the Holders of Outstanding Securities.

     Anything in this Article to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon Company Request any
money or U.S. Government Obligations held by it as provided in Section 1304
with respect to any Securities which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee, are in excess of the amount thereof which
would then be required to be deposited to effect the Defeasance or Covenant
Defeasance, as the case may be, with respect to such Securities.

SECTION 1306.  REINSTATEMENT.





                                      -65-
<PAGE>   73


     If the Trustee or the Paying Agent is unable to apply any money in
accordance with this Article with respect to any Securities by reason of any
order or judgment of any court or governmental authority enjoining, restraining
or otherwise prohibiting such application, then the obligations under this
Indenture and such Securities from which the Company has been discharged or
released pursuant to Section 1302 or 1303 shall be revived and reinstated as
though no deposit had occurred pursuant to this Article with respect to such
Securities, until such time as the Trustee or Paying Agent is permitted to
apply all money held in trust pursuant to Section 1305 with respect to such
Securities in accordance with this Article; provided, however, that if the
Company makes any payment of principal of or any premium or interest on any
such Security following such reinstatement of its obligations, the Company
shall be subrogated to the rights (if any) of the Holders of such Securities to
receive such payment from the money so held in trust.

                                ARTICLE FOURTEEN

                            CONVERSION OF SECURITIES

SECTION 1401.  APPLICABILITY OF ARTICLE.

     The provisions of this Article shall be applicable to the Securities of
any series which are convertible into shares of Common Stock of the Company,
and the issuance of such shares of Common Stock upon the conversion of such
Securities, except as otherwise specified as contemplated by Section 301 for
the Securities of such series.

SECTION 1402.  EXERCISE OF CONVERSION PRIVILEGE.

     In order to exercise a conversion privilege, the Holder of a Security of a
series with such a privilege shall surrender such Security to the Company at
the office or agency maintained for that purpose pursuant to Section 1002,
accompanied by a duly executed conversion notice to the Company substantially
in the form set forth in Section 206 stating that the Holder elects to convert
such Security or a specified portion thereof.  Such notice shall also state, if
different from the name and address of such Holder, the name or names (with
address) in which the certificate or certificates for shares of Common Stock
which shall be issuable on such conversion shall be issued.  Securities
surrendered for conversion shall (if so required by the Company or the Trustee)
be duly endorsed by or accompanied by instruments of transfer in forms
satisfactory to the Company and the Trustee duly executed by the registered
Holder or its attorney duly authorized in writing; and Securities so
surrendered for conversion (in whole or in part) during the period from the
close of business on any Regular Record Date to the opening of business on the
next succeeding Interest Payment Date (excluding Securities or portions thereof
called for redemption during the period beginning at the close of business on a
Regular Record Date and ending at the opening of business on the first Business
Day after the next succeeding Interest Payment Date, or if such Interest
Payment Date is not a Business Day, the second such Business Day) shall also be
accompanied by payment in funds acceptable to the Company of an amount equal to
the interest payable on such Interest Payment Date on the principal amount of
such Security then being converted, and such interest shall be payable to such
registered Holder notwithstanding the conversion of such Security, subject to
the provisions of





                                      -66-
<PAGE>   74

Section 307 relating to the payment of Defaulted Interest by the Company.  As
promptly as practicable after the receipt of such notice and of any payment
required pursuant to a Board Resolution and, subject to Section 303, set forth,
or determined in the manner provided, in an Officers' Certificate, or
established in one or more indentures supplemental hereto setting forth the
terms of such series of Security, and the surrender of such Security in
accordance with such reasonable regulations as the Company may prescribe, the
Company shall issue and shall deliver, at the office or agency at which such
Security is surrendered, to such Holder or on its written order, a certificate
or certificates for the number of full shares of Common Stock issuable upon the
conversion of such Security (or specified portion thereof), in accordance with
the provisions of such Board Resolution, Officers' Certificate or supplemental
indenture, and cash as provided therein in respect of any fractional share of
such Common Stock otherwise issuable upon such conversion.  Such conversion
shall be deemed to have been effected immediately prior to the close of
business on the date on which such notice and such payment, if required, shall
have been received in proper order for conversion by the Company and such
Security shall have been surrendered as aforesaid (unless such Holder shall
have so surrendered such Security and shall have instructed the Company to
effect the conversion on a particular date following such surrender and such
Holder shall be entitled to convert such Security on such date, in which case
such conversion shall be deemed to be effected immediately prior to the close
of business on such date) and at such time the rights of the Holder of such
Security as such Security Holder shall cease and the person or persons in whose
name or names any certificate or certificates for shares of Common Stock of the
Company shall be issuable upon such conversion shall be deemed to have become
the Holder or Holders of record of the shares represented thereby.  Except as
set forth above and subject to the final paragraph of Section 307, no payment
or adjustment shall be made upon any conversion on account of any interest
accrued on the Securities (or any part thereof) surrendered for conversion or
on account of any dividends on the Common Stock of the Company issued upon such
conversion.

     In the case of any Security which is converted in part only, upon such
conversion the Company shall execute and the Trustee shall authenticate and
deliver to or on the order of the Holder thereof, at the expense of the
Company, a new Security or Securities of the same series, of authorized
denominations, in aggregate principal amount equal to the unconverted portion
of such Security.

SECTION 1403.  NO FRACTIONAL SHARES.

     No fractional share of Common Stock of the Company shall be issued upon
conversions of Securities of any series.  If more than one Security shall be
surrendered for conversion at one time by the same Holder, the number of full
shares which shall be issuable upon conversion shall be computed on the basis
of the aggregate principal amount of the Securities (or specified portions
thereof to the extent permitted hereby) so surrendered.  If, except for the
provisions of this Section 1403, any Holder of a Security or Securities would
be entitled to a fractional share of Common Stock of the Company upon the
conversion of such Security or Securities, or specified portions thereof, the
Company shall pay to such Holder an amount in cash equal to the current market
value of such fractional share computed, (i) if such Common Stock is listed or
admitted to unlisted trading privileges on a national securities exchange or
market, on the basis of the last reported sale price regular way on such
exchange or market on the last trading day prior to the date





                                      -67-
<PAGE>   75

of conversion upon which such a sale shall have been effected, or (ii) if such
Common Stock is not at the time so listed or admitted to unlisted trading
privileges on a national securities exchange or market, on the basis of the
average of the bid and asked prices of such Common Stock in the
over-the-counter market, on the last trading day prior to the date of
conversion, as reported by the National Quotation Bureau, Incorporated or
similar organization if the National Quotation Bureau, Incorporated is no
longer reporting such information, or if not so available, the fair market
price as determined by the Board of Directors.  For purposes of this Section,
"trading day" shall mean each Monday, Tuesday, Wednesday, Thursday and Friday
other than any day on which the Common Stock is not traded on the Nasdaq
National Market, or if the Common Stock is not traded on the Nasdaq National
Market, on the principal exchange or market on which the Common Stock is traded
or quoted.

SECTION 1404.  ADJUSTMENT OF CONVERSION PRICE.

     The conversion price of Securities of any series that is convertible into
Common Stock of the Company shall be adjusted for any stock dividends, stock
splits, reclassifications, combinations or similar transactions in accordance
with the terms of the supplemental indenture or Board Resolutions setting forth
the terms of the Securities of such series.

     Whenever the conversion price is adjusted, the Company shall compute the
adjusted conversion price in accordance with terms of the applicable Board
Resolution or supplemental indenture and shall prepare an Officers' Certificate
setting forth the adjusted conversion price and showing in reasonable detail
the facts upon which such adjustment is based, and such certificate shall
forthwith be filed at each office or agency maintained for the purpose of
conversion of Securities pursuant to Section 1002 and, if different, with the
Trustee.  The Company shall forthwith cause a notice setting forth the adjusted
conversion price to be mailed, first class postage prepaid, to each Holder of
Securities of such series at its address appearing on the Security Register and
to any conversion agent other than the Trustee.

SECTION 1405.  NOTICE OF CERTAIN CORPORATE ACTIONS.

     In case:
     (1)  the Company shall declare a dividend (or any other distribution) on
its common stock payable otherwise than in cash out of its retained earnings
(other than a dividend for which approval of any shareholders of the Company is
required) that would require an adjustment pursuant to Section 1404; or

     (2)  the Company shall authorize the granting to all or substantially all
of the holders of its common stock of rights, options or warrants to subscribe
for or purchase any shares of capital stock of any class or of any other rights
(other than any such grant for which approval of any shareholders of the
Company is required); or

     (3)  of any reclassification of the common stock of the Company (other
than a subdivision or combination of its outstanding shares of common stock, or
of any consolidation, merger or share





                                      -68-
<PAGE>   76

exchange to which the Company is a party and for which approval of any
shareholders of the Company is required), or of the sale of all or
substantially all of the assets of the Company; or

     (4)  of the voluntary or involuntary dissolution, liquidation or winding
up of the Company;

then the Company shall cause to be filed with the Trustee, and shall cause to
be mailed to all Holders at their last addresses as they shall appear in the
Security Register, at least 20 days (or 10 days in any case specified in Clause
(1) or (2) above) prior to the applicable record date hereinafter specified, a
notice stating (i) the date on which a record is to be taken for the purpose of
such dividend, distribution, rights, options or warrants, or, if a record is
not to be taken, the date as of which the holders of common stock of record to
be entitled to such dividend, distribution, rights, options or warrants are to
be determined, or (ii) the date on which such reclassification, consolidation,
merger, share exchange, sale, dissolution, liquidation or winding up is
expected to become effective, and the date as of which it is expected that
holders of common stock of record shall be entitled to exchange their shares of
common stock for securities, cash or other property deliverable upon such
reclassification, consolidation, merger, share exchange, sale, dissolution,
liquidation or winding up.  If at any time the Trustee shall not be the
conversion agent, a copy of such notice shall also forthwith be filed by the
Company with the Trustee.

SECTION 1406.  RESERVATION OF SHARES OF COMMON STOCK.

     The Company shall at all times reserve and keep available, free from
preemptive rights, out of its authorized but unissued Common Stock, for the
purpose of effecting the conversion of Securities, the full number of shares of
Common Stock of the Company then issuable upon the conversion of all
outstanding Securities of any series that has conversion rights.

SECTION 1407.  PAYMENT OF CERTAIN TAXES UPON CONVERSION.

     Except as provided in the next sentence, the Company will pay any and all
taxes that may be payable in respect of the issue or delivery of shares of its
Common Stock on conversion of Securities pursuant hereto.  The Company shall
not, however, be required to pay any tax which may be payable in respect of any
transfer involved in the issue and delivery of shares of its Common Stock in a
name other than that of the Holder of the Security or Securities to be
converted, and no such issue or delivery shall be made unless and until the
person requesting such issue has paid to the Company the amount of any such
tax, or has established, to the satisfaction of the Company, that such tax has
been paid.

SECTION 1408.  NONASSESSABILITY.

     The Company covenants that all shares of its Common Stock which may be
issued upon conversion of Securities will upon issue in accordance with the
terms hereof be duly and validly issued and fully paid and nonassessable.

SECTION 1409.  PROVISION IN CASE OF CONSOLIDATION, MERGER OR SALE OF ASSETS.





                                      -69-
<PAGE>   77


     In case of any consolidation or merger of the Company with or into any
other Person, any merger of another Person with or into the Company (other than
a merger which does not result in any reclassification, conversion, exchange or
cancellation of outstanding shares of Common Stock of the Company) or any
conveyance, sale, transfer or lease of all or substantially all of the assets
of the Company, the Person formed by such consolidation or resulting from such
merger or which acquires such assets, as the case may be, shall execute and
deliver to the Trustee a supplemental indenture providing that the Holder of
each Security of a series then Outstanding that is convertible into Common
Stock of the Company shall have the right thereafter (which right shall be the
exclusive conversion right thereafter available to said Holder), during the
period such Security shall be convertible, to convert such Security only into
the kind and amount of securities, cash and other property receivable upon such
consolidation, merger, conveyance, sale, transfer or lease by a holder of the
number of shares of Common Stock of the Company into which such Security might
have been converted immediately prior to such consolidation, merger,
conveyance, sale, transfer or lease, assuming such holder of Common Stock of
the Company (i) is not a Person with which the Company consolidated or merged
with or into or which merged into or with the Company or to which such
conveyance, sale, transfer or lease was made, as the case may be (a
"Constituent Person"), or an Affiliate of a Constituent Person and (ii) failed
to exercise his rights of election, if any, as to the kind or amount of
securities, cash and other property receivable upon such consolidation, merger,
conveyance, sale, transfer or lease (provided that if the kind or amount of
securities, cash and other property receivable upon such consolidation, merger,
conveyance, sale, transfer, or lease is not the same for each share of Common
Stock of the Company held immediately prior to such consolidation, merger,
conveyance, sale, transfer or lease by others than a Constituent Person or an
Affiliate thereof and in respect of which such rights of election shall not
have been exercised ("Non- electing Share"), then for the purpose of this
Section 1409 the kind and amount of securities, cash and other property
receivable upon such consolidation, merger, conveyance, sale, transfer or lease
by the holders of each Non-electing Share shall be deemed to be the kind and
amount so receivable per share by a plurality of the Non-electing Shares).
Such supplemental indenture shall provide for adjustments which, for events
subsequent to the effective date of such supplemental indenture, shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Article or in accordance with the terms of the supplemental indenture or Board
Resolutions setting forth the terms of such adjustments.  The above provisions
of this Section 1409 shall similarly apply to successive consolidations,
mergers, conveyances, sales, transfers or leases.  Notice of the execution of
such a supplemental indenture shall be given by the Company to the Holder of
each Security of a series that is convertible into Common Stock of the Company
as provided in Section 106 promptly upon such execution.

     Neither the Trustee nor any conversion agent, if any, shall be under any
responsibility to determine the correctness of any provisions contained in any
such supplemental indenture relating either to the kind or amount of shares of
stock or other securities or property or cash receivable by Holders of
Securities of a series convertible into Common Stock of the Company upon the
conversion of their Securities after any such consolidation, merger,
conveyance, transfer, sale or lease or to any such adjustment, but may accept
as conclusive evidence of the correctness of any such provisions, and shall be
protected in relying upon, an Opinion of Counsel with respect thereto, which
the Company shall cause to be furnished to the Trustee upon request.





                                      -70-
<PAGE>   78

SECTION 1410.  DUTIES OF TRUSTEE REGARDING CONVERSION.

     Neither the Trustee nor any conversion agent shall at any time be under
any duty or responsibility to any Holder of Securities of any series that is
convertible into Common Stock of the Company to determine whether any facts
exist which may require any adjustment of the conversion price, or with respect
to the nature or extent of any such adjustment when made, or with respect to
the method employed, whether herein or in any supplemental indenture, any
resolutions of the Board of Directors or written instrument executed by one or
more officers of the Company provided to be employed in making the same.
Neither the Trustee nor any conversion agent shall be accountable with respect
to the validity or value (or the kind or amount) of any shares of Common Stock
of the Company, or of any securities or property, which may at any time be
issued or delivered upon the conversion of any Securities and neither the
Trustee nor any conversion agent makes any representation with respect thereto.
Subject to the provisions of Section 601, neither the Trustee nor any
conversion agent shall be responsible for any failure of the Company to issue,
transfer or deliver any shares of its Common Stock or stock certificates or
other securities or property upon the surrender of any Security for the purpose
of conversion or to comply with any of the covenants of the Company contained
in this Article Fourteen or in the applicable supplemental indenture,
resolutions of the Board of Directors or written instrument executed by one or
more duly authorized officers of the Company.

SECTION 1411.  REPAYMENT OF CERTAIN FUNDS UPON CONVERSION.

     Any funds which at any time shall have been deposited by the Company or on
its behalf with the Trustee or any other paying agent for the purpose of paying
the principal of, and premium, if any, and interest, if any, on any of the
Securities (including, but not limited to, funds deposited for the sinking fund
referred to in Article Twelve and funds deposited pursuant to Article Thirteen
hereof) and which shall not be required for such purposes because of the
conversion of such Securities as provided in this Article Fourteen shall after
such conversion be repaid to the Company by the Trustee upon the Company's
written request.

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





                                      -71-
<PAGE>   79

         IN WITNESS WHEREOF, the parties hereto have caused this Indenture to
be duly executed all as of the day and year first above written.

                                        WESTELL TECHNOLOGIES, INC.


                                        By:_________________________________
                                            Name:
                                            Title:



                                        LASALLE NATIONAL BANK, as Trustee


                                        By:_________________________________
                                            Name:
                                            Title:





                                      -72-

<PAGE>   1

                                                                    EXHIBIT 5.1

                     [MCDERMOTT, WILL & EMERY LETTERHEAD]

   
                               December 1, 1997
    

Westell Technologies, Inc.
750 N. Commons Drive
Aurora, Illinois 60504

    Re: $300,000,000 Aggregate Initial 
        Offering Price of Securities

Ladies and Gentlemen:

   
    Reference is made to the Registration Statement on Form S-3 as amended by 
Amendment No. 1 thereto (the "Registration Statement") filed by Westell
Technologies, Inc., a Delaware corporation (the "Company"), with the Securities
and Exchange Commission (the "Commission") under the Securities Act of 1933, as
amended (the "Act"), relating to the registration of $300,000,000 aggregate
initial offering price of (i) unsecured debt securities which may be senior or
subordinated ("Debt Securities"), and which may be convertible into shares of
Class A common stock, par value $.01 per share ("Common Stock"), and (ii)
shares of Common Stock. The Debt Securities and Common Stock are hereinafter
collectively referred to as the "Securities". The Securities may be offered in
series, in amounts, at prices and on other terms set forth or to be set forth
in the Registration Statement and any amendments thereto and in the prospectus
contained in the Registration Statement (the "Prospectus") and one or more
supplements thereto (each a "Prospectus Supplement"). All capitalized terms not
otherwise defined herein have the meaning set forth in the Registration
Statement.
    

   
    The Debt Securities specified as Senior Debt Securities in the applicable 
Prospectus Supplement will be issued under an Indenture, to be entered into
between the Company and LaSalle National Bank, as Trustee, the
form of which is filed as an exhibit to the Registration Statement (such
Indenture, as amended or supplemented from time to time, the "Senior Debt
Securities Indenture"). The Debt Securities specified as Subordinated Debt
Securities in the applicable Prospectus Supplement will be issued under an
Indenture, the form of which is filed as an exhibit to the Registration
Statement, to be entered into by the Company and LaSalle National Bank
(such Indenture, as amended or supplemented from time to time, the 
"Subordinated Debt Securities Indenture").
    

    We have reviewed the proceedings to date with respect to the proposed 
issuance and sale of the Securities, and have examined such records,
documents and questions of law, as we have considered necessary as a basis for
this opinion. We have assumed the authenticity of all documents submitted to us
as originals, the genuineness of all signatures, the legal capacity of all
natural persons and the conformity with the original documents of any copies
thereof submitted to us for our examination.

    Based on the foregoing and subject to the qualifications set forth below, 
we are of the opinion that:

    1. Each series of Senior Debt Securities will be legally issued and 
binding obligations of the Company when (i) the Registration Statement, as
finally amended, shall have become effective under the Act, (ii) the Senior
Debt Securities Indenture, including any necessary supplemental indenture,
shall have been qualified under the Trust Indenture Act of 1939, as amended
(the "Trust Act"), (iii) each of the Senior Debt Securities Indenture and any
necessary supplemental indenture to the Senior Debt Securities Indenture shall



<PAGE>   2


   
Westell Technologies, Inc.
November __, 1997
Page 2
    

have been duly authorized, executed and delivered by the Company and the
trustee thereunder, (iv) the terms of such series of Senior Debt
Securities shall have been established and approved in accordance with the
resolutions of the Company's board of directors heretofore adopted, and as
contemplated by the Registration Statement, any applicable Prospectus
Supplement and the Senior Debt Securities Indenture, (v) a Prospectus
Supplement with respect to such series of Senior Debt Securities shall
have been filed (or transmitted for filing) with the Commission pursuant
to Rule 424(b) of the Act, and (vi) such Senior Debt Securities shall have
been duly executed and authenticated as provided in the Senior Debt
Securities Indenture and duly delivered to the purchasers thereof against
payment of the agreed consideration therefor in accordance with the
underwriting agreement with respect thereto.

    2. Each series of Subordinated Debt Securities will be legally issued
and binding obligations of the Company when (i) the Registration
Statement, as finally amended, shall have become effective under the Act,
(ii) the Subordinated Debt Securities Indenture, including any necessary
supplemental indenture, shall have been qualified under the Trust Act,
(iii) each of the Subordinated Debt Securities Indenture and any necessary
supplemental indenture to the Subordinated Debt Securities Indenture shall
have been duly authorized, executed and delivered by the Company and the
trustee thereunder, (iv) the terms of such series of Subordinated Debt
Securities shall have been established and approved in accordance with the
resolutions of the Company's board of directors heretofore adopted, and as
contemplated by the Registration Statement, any applicable Prospectus
Supplement and the Subordinated Debt Securities Indenture, (v) a
Prospectus Supplement with respect to such series of Subordinated Debt
Securities shall have been filed (or transmitted for filing) with the
Commission pursuant to Rule 424(b) of the Act, and (vi) such Subordinated
Debt Securities shall have been duly executed and authenticated as
provided in the Subordinated Debt Securities Indenture and duly delivered
to the purchasers thereof against payment of the agreed consideration
therefor in accordance with the underwriting agreement with respect
thereto.

   
    3. The Common Stock will be legally issued, fully paid and
nonassessable when (i) the Registration Statement, as finally amended,
shall have become effective under the Act, (ii) the issuance and sale of
the Common Stock shall have been duly authorized by the Company's board of
directors or a duly authorized committee thereof, and as contemplated by
the Registration Statement and any applicable Prospectus Supplement, (iii) the
stockholders of Company shall duly authorize an amendment to the Company's
Amended and Restated Certificate of Incorporation which increases the number
of shares of authorized Common Stock to reflect the shares to be issued pursuant
to the Registration Statement (the "Charter Amendment"), (iv) the Charter
Amendment is filed with, and made effective by, the Secretary of State of the
State of Delaware prior to the issuance of any share of Common Stock pursuant
to the Registration Statement, (v) a Prospectus Supplement with respect to
such shares of Common Stock shall have been filed (or transmitted for filing)
with the Commission pursuant to Rule 424(b) of the Act, and (v) certificates
representing the Common Stock shall have been duly executed, countersigned and
registered and duly delivered to the purchasers thereof against payment of the
agreed consideration therefor but not less than the stated value) in accordance
with the underwriting agreement with respect thereto.
    

    The opinions set forth in paragraphs 1 and 2 are subject to the
qualification that enforceability may be limited by (i) applicable
bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium or
similar laws of general applicability relating to or affecting the
enforcement of creditors' rights and (ii) general principles of equity
(regardless of whether enforceability is considered in a proceeding in
equity or at law).

    This opinion is limited to the General Corporation Law of the State
of Delaware, the laws of the State of New York and the laws of the United
States of America.



<PAGE>   3




   
Westell Technologies, Inc.
December __, 1997
Page 3
    


    We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the use of our name under the caption "Legal
Matters" in the Prospectus and to the use of our name in any Prospectus
Supplement relating to an offering of the Securities reviewed and approved by
us prior to the distribution of such Prospectus Supplement and the filing
thereof with the Commission. In giving such consent, we do not thereby admit
that we are within the category of persons whose consent is required by
Section 7 of the Act or the related rules promulgated by the Commission.

                                     Very truly yours,

   
                                     McDermott, Will & Emery
    




<PAGE>   1

                                                                   EXHIBIT 12.1

                  STATEMENT REGARDING COMPUTATION OF RATIOS

<TABLE>
<CAPTION>

                                                                                                 SIX MONTHS ENDED
                                                            YEAR ENDED MARCH 31,                   SEPTEMBER 30,
                                               ----------------------------------------------    ------------------
                                                1993    1994      1995     1996        1997       1996       1997
                                                ----    ----      ----     ----        ----       ----       ----
<S>                                             <C>     <C>      <C>      <C>        <C>         <C>        <C>
Net Income from continuing operations......    1,735     313     (125)    (1,453)    (14,701)    (3,617)     (9,037)
Income taxes...............................      913    (989)    (788)    (1,886)     (9,820)    (2,495)     (5,920)

Income before income taxes.................    2,648    (676)    (913)    (3,339)    (24,521)    (6,112)    (14,957)

Fixed charges:
  Interest Expense.........................      137     176      769        859         330        197         125
  Interest portion of rentals..............      100     100      229        351         407        185         304

Total fixed charges........................      237     276      998      1,210         737        382         429

Total earnings as defined..................    2,885    (400)      85     (2,129)    (23,784)    (5,730)    (14,528)

Ratio of earnings to fixed charges.........     12.2    (1.5)     0.1       (1.8)      (32.3)     (15.0)      (33.9)


</TABLE>


<PAGE>   1
 
                              ARTHUR ANDERSEN LLP
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
     As independent public accountants, we hereby consent to the incorporation
by reference of our reports (and to all references to our Firm) included in or
made a part of this registration statement.
 
                                          ARTHUR ANDERSEN LLP
 
   
Chicago, Illinois
    
   
December 1, 1997
    

<PAGE>   1
   
                                                                  EXHIBIT 25.1
    

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             -----------------------

                                    FORM T-1

                   STATEMENT OF ELIGIBILITY AND QUALIFICATION
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A

                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                             -----------------------

                              LASALLE NATIONAL BANK
               (Exact name of trustee as specified in its charter)

                                   36-1521370
                                (I.R.S. Employer

                               Identification No.)

                135 South LaSalle Street, Chicago, Illinois 60603
               (Address of principal executive offices) (Zip Code)

                             -----------------------

                               M. ROBERT K. QUINN

                    Senior Vice President and General Counsel
                            Telephone: (312) 904-2010
                            135 South LaSalle Street

                             Chicago, Illinois 60603
            (Name, address and telephone number of agent for service)

                             -----------------------

                       WESTELL TECHNOLOGIES, INCORPORATED
               (Exact name of obligor as specified in its charter)

                 Delaware                           36-3154957     
       (State or other jurisdiction              (I.R.S. Employer  
      incorporation or organization)            Identification No.)
                               
                               
                               

      750 North Commons Drive
          Aurora, Illinois
           (630) 898-2500                                60504
      
(Address of Principal Executive Offices)              (Zip Code) 
                                        
                                                                      

                           ------------------------
                            Senior Debt Securities
                     (Title of the indenture securities)



<PAGE>   2



ITEM 1.  GENERAL INFORMATION

Furnish the following information as to the trustee:

     (a)  Name and address of each examining or supervising authority to which
it is subject.

          1.   Comptroller of the Currency, Washington D.C.

          2.   Federal Deposit Insurance Corporation, Washington, D.C.

          3.   The Board of Governors of the Federal Reserve Systems, 
               Washington, D.C.

     (b)  Whether it is authorized to exercise corporate trust powers.

                                      Yes.

ITEM 2.   AFFILIATIONS WITH OBLIGOR AND UNDERWRITERS.

If the obligor or any underwriter for the obligor is an affiliate of the
trustee, describe each such affiliation.

          Neither the obligor nor any  underwriter for the obligor is an
affiliate of the trustee.

ITEM 3.   VOTING SECURITIES OF THE TRUSTEE.

Furnish the following information as to each class of voting securities of the
trustee:

                                 Not applicable

ITEM 4.   TRUSTEESHIPS UNDER OTHER INDENTURES.

If the trustee is a trustee under another indenture under which any other
securities, or certificates of interest or participation in any other
securities, of the obligor are outstanding, furnish the following information:

     (a)  Title of the securities outstanding under each other indenture.

          It is anticipated that Convertible Subordinated Notes may be issued
     in addition to the Senior Debt Securities.

     (b)  A brief statement of the facts relied upon as a basis for the claim
     that no conflicting interest within the meaning of Section 310(b)(1) of the
     Act arises as a result of the trusteeship under such other indenture,
     including a statement as to how the indenture securities will rank as
     compared with the securities issued under such other indenture.

          The two issues will rank pari-passu in terms of their  indebtedness
     and are therefore without conflict pursuant to the Trust Indenture Act.



<PAGE>   3



ITEM 5.  INTERLOCKING DIRECTORATES AND SIMILAR RELATIONSHIPS WITH THE OBLIGOR
OR UNDERWRITERS.

If the trustee or any of the directors or executive officers of the trustee is a
director, officer, partner, employee, appointee, or representative of the
obligor or of any underwriter for the obligor, identify each such person having
any such connection and state the nature of each such connection.

                                 Not applicable

ITEM 6.  VOTING SECURITIES OF THE TRUSTEE OWNED BY THE OBLIGOR OR ITS OFFICIALS.

Furnish the following information as to the voting securities of the trustee
owned beneficially by the obligor and each director, partner and executive
officer of the obligor.

                                 Not applicable

ITEM 7.  VOTING SECURITIES OF THE TRUSTEE OWNED BY UNDERWRITERS OR THEIR
OFFICIALS.

Furnish the following information as to the voting securities of the trustee
owned beneficially by each underwriter for the obligor and each director,
partner, and executive officer of each such underwriter.

                                 Not applicable

ITEM 8. SECURITIES OF THE OBLIGOR OWNED OR HELD BY THE TRUSTEE.

Furnish the following information as to securities of the obligor owned
beneficially or held as collateral security for obligations in default by the
trustee:

                                 Not applicable

ITEM 9.  SECURITIES OF THE UNDERWRITER OWNED OR HELD BY THE TRUSTEE.

If the trustee owns beneficially or holds as collateral security for obligations
in default any securities of an underwriter for the obligor, furnish the
following information as to each class of securities of such underwriter any of
which are so owned or held by the trustee.

                                 Not applicable

ITEM 10. OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF VOTING SECURITIES OF CERTAIN
AFFILIATES OR SECURITY HOLDERS OF THE OBLIGOR.

If the trustee owns beneficially or holds as collateral security for obligations
in default voting securities of a person who, to the knowledge of the trustee
(1) owns 10 percent or more of the voting securities of the obligor or (2) is an
affiliate, other than a subsidiary, of the obligor, furnish the following
information as to the voting securities of such person.

                                 Not applicable




<PAGE>   4



ITEM 11. OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF ANY SECURITIES OF A PERSON
OWNING 50 PERCENT OR MORE OF THE VOTING SECURITIES OF THE OBLIGOR.

If the trustee owns beneficially or holds as collateral security for obligations
in default any securities of a person who, to the knowledge of the trustee, owns
50 percent or more of the voting securities of the obligor, furnish the
following information as to each class of securities of such person any of which
are so owned or held by the trustee.

                                 Not applicable

ITEM 12. INDEBTEDNESS OF THE OBLIGOR TO THE TRUSTEE.

If the obligor is indebted to the trustee, furnish the following information.

                                 Not applicable

ITEM 13. DEFAULTS BY THE OBLIGOR.


a)   State whether there is or has been a default with respect to the
securities under this indenture. Explain the nature of any such default.

                                 Not applicable

b)   If the trustee is a trustee under another indenture under which any other
securities, or certificates of interest or participation in any other
securities, of the obligor are outstanding, or is trustee for more than one
outstanding series of securities under the indenture, state whether there has
been a default under any such indenture or series, identify the indenture or
series affected, and explain the nature of any such default.

                                 Not applicable

ITEM 14. AFFILIATIONS WITH THE UNDERWRITERS.

If any underwriter is an affiliate of the trustee, describe each such
affiliation.

                                 Not applicable

ITEM 15. FOREIGN TRUSTEE.

Identify the order or rule pursuant to which the foreign trustee is authorized
to act as sole trustee under indentures qualified or to be qualified.

                                 Not applicable

ITEM 16. LIST OF EXHIBITS.

List below all exhibits filed as part of this statement of eligibility and
qualification.

          1.   A copy of the Articles of Association of LaSalle  National Bank
               now in effect.

          2.   A copy of the certificate of authority to commence business.

          3.   A copy of the authorization to exercise corporate trust powers.


<PAGE>   5



          4.   A copy of the existing By-Laws of LaSalle National Bank.

          5.   Not applicable.

          6.   The consent of the trustee required by Section 321(b) of the
               Trust Indenture Act of 1939.

          7.   A copy of the latest report of condition of the trustee published
               pursuant to law or the requirements of its supervising or
               examining authority.

          8.   Not applicable.

          9.   Not applicable.


<PAGE>   6



                                    SIGNATURE

Pursuant to the requirements of the Trust Indenture Act of 1939,the trustee,
LaSalle National Bank, a corporation organized and existing under the laws of
the United States of America, has duly caused this statement of eligibility and
qualification to be signed on its behalf by the undersigned, thereunto duly
authorized, all in the City of Chicago, State of Illinois, on the 21st day of
November, 1997.

                                           LASALLE NATIONAL BANK
                                           
                                           By: /s/ Sarah H. Webb
                                               -----------------------------
                                                   Sarah H. Webb
                                                   First Vice President
<PAGE>   7



                                    EXHIBIT 1

                             ARTICLES OF ASSOCIATION




<PAGE>   8



                                    ARTICLES
                                       OF

                                   ASSOCIATION

   
                           LA SALLE NATIONAL BANK (LOGO)
    



                             LA SALLE NATIONAL BANK
                                CHICAGO, ILLINOIS



<PAGE>   9




   
                                    (LOGO)
                          LASALLE NATIONAL BANK LOGO
    

                             ARTICLES OF ASSOCIATION

          FIRST. The title of this association,  which shall carry on the
business of banking under the laws of the United States shall be "LaSalle
National Bank."

          SECOND. The place where the main banking house or office of this
association shall be located, its operations of discount and deposit carried on,
and its general business conducted, shall be Chicago, County of Cook, State of
Illinois.

          THIRD. The Board of Directors of this association shall consist of
such number of its shareholders, not less than five nor more than twenty-five,
as from time to time shall be determined by a majority of the votes to which all
of its shareholders are at the time entitled. A majority of the Board of
Directors shall be necessary to constitute a quorum for the transaction of
business. The Board of Directors, by vote of a majority of the full board, may,
between annual meetings of shareholders increase the membership of the Board
where the number of directors last elected by shareholders was 15 or less, by
not more than two members, and where the number of directors last elected by
shareholders was 16 or more, by not more than four members and by a like vote
appoint qualified persons to fill the vacancies created thereby; provided that
the number of Directors shall at no time exceed twenty-five.

          FOURTH. The regular annual meeting of the shareholders of this
association shall be held at its main banking house, or other convenient place
duly authorized by the board of directors on such day of each year as is
specified therefor in the bylaws.

          FIFTH. The amount of capital stock which this association is
authorized to issue shall be Twenty Million Dollars ($20,000,000.00) divided
into 2,000,000 shares of common capital stock of the par value of $10.00 each;
but said capital stock may be increased or decreased from time to time, in
accordance with the provisions of the laws of the United States.

          If the capital stock is increased by the sale of additional shares
thereof, other than to key officers and employees of the association upon the
exercise of options granted pursuant to the terms of a stock option plan then in
effect, as to which sales all pre-emptive rights are waived, each shareholder
shall be entitled to subscribe for such additional shares in proportion to the
number of shares of said capital stock owned by him at the time the increase is
authorized by the shareholders, unless another time subsequent to the date of
the shareholders' meeting is specified in a resolution adopted by the
shareholders at the time the increase is authorized. The board of directors
shall have the power to prescribe a reasonable period of time within which the
pre-emptive rights to subscribe to the new shares of capital stock may be
exercised.

          The association, at any time and from time to time, may authorize and
issue debt obligations, whether or not subordinated, without the approval of the
shareholders.

          SIXTH. The board of directors shall appoint one of its members
president of this association, who shall be chairman of the board, but the board
of directors may appoint a director in lieu of the president to be chairman of
the board, who shall perform such duties as may be designated by the board of
directors. The board of directors shall have the power to appoint one or more
vice presidents, a cashier and such other officers as may be required to
transact the business of this association; to fix the salaries to be paid to all
officers of this association; and to dismiss such officers, or any of them.




<PAGE>   10


         The board of directors shall have the power to define the duties of
officers and employees of this association, to require bonds from them, and to
fix the penalty thereof; to regulate the manner in which directors shall be
elected or appointed, and to appoint judges of the election; to make all bylaws
that it may be lawful for them to make for the general regulation of the
business of this association and the management of its affairs; and generally
to do and perform all acts that it may be lawful for a board of directors to do
and perform.

         SEVENTH. This association shall have succession from the date of its
organization certificate until such time as it be dissolved by act of its
shareholders in accordance with the provisions of the banking laws of the United
States, or until its franchise becomes forfeited by reason of violation of law,
or until terminated by either a general or a special act of Congress, or until
its affairs be placed in the hands of a receiver and finally wound up by him.

         EIGHTH. The board of directors of this association, or any three or
more shareholders owning, in the aggregate, not less than ten per centum of the
stock of this association, may call a special meeting of shareholders at any
time: Provided, however, that, unless otherwise provided by law, not less than
ten days prior to the date fixed for any such meeting, a notice of the time,
place, and purpose of the meeting shall be given by first-class mail, postage
prepaid, to all shareholders of record of this association at their respective
addresses as shown upon the books of the association. These articles of
association may be amended at any regular or special meeting of the shareholders
by the affirmative vote of the shareholders owning at least a majority of the
stock of this association, subject to the provisions of the banking laws of the
United States. The notice of any shareholders' meeting, at which an amendment to
the articles of association of this association is to be considered, shall be
given as herein-above set forth.

   
         NINTH. Any person, his heirs, executors, or administrators, may be
indemnified or reimbursed by the association for reasonable expenses actually
incurred in connection with any action, suit, or proceeding, civil or criminal,
to which he or they shall be made a party by reason of his being or having been
a director, officer, or employee of the association or of any firm, corporation,
or organization which he served in any such capacity at the request of the
association: provided, however, that no person shall be so indemnified or
reimbursed in relation to any matter in such action, suit, or proceeding as to
which he shall finally be adjudged to have been guilty of or liable for
negligence or wilful misconduct in the performance of his duties to the
association; and, provided further, that no person shall be so indemnified or
reimbursed in relation to any matter in such action, suit, or proceeding which
has been made the subject of a compromise settlement except with the approval of
a court of competent jurisdiction, or the holders of record of a majority of the
outstanding shares of the association, or the board of directors, acting by vote
of directors not parties to the same or substantially the same action, suit, or
proceeding, constituting a majority of the whole number of the directors. The
foregoing right of indemnification or reimbursement shall not be exclusive of
other rights to which such person, his heirs, executors, or administrators, may
be entitled as a matter of law.
    

                                    ********

May 17, 1982
Form No. 181, Rev 5/17/82 GW


<PAGE>   11



                                    EXHIBIT 2

                            CERTIFICATE OF AUTHORITY
                              TO COMMENCE BUSINESS




<PAGE>   12



                                STATE OF ILLINOIS

                                AUDITOR'S OFFICE



NO.  333                             [LOGO]

                         NATIONAL BANK TRUST CERTIFICATE

                                                 Springfield, FEBRUARY 15th 1928

   
         I, OSCAR NELSON, Auditor of Public Accounts of the State of Illinois,
do hereby certify that the NATIONAL BUILDERS BANK OF CHICAGO located at CHICAGO,
County of COOK and State of Illinois, a corporation organized under and by
authority of the statutes of the United States governing National Banks and
authority granted by the Federal Reserve Act for the purpose of accepting and
executing trusts, has this day deposited in this office, securities in the sum
of TWO HUNDRED THOUSAND Dollars, $200,000.00 of the character designated by
Section 6 of the Act of the Legislature of the State of Illinois entitled "An
Act to provide for and regulate the administration of trusts by trust
companies."
    

         The said deposit is made for the benefit of the creditors of said
NATIONAL BUILDERS BANK OF CHICAGO under and by virtue of the provisions of the
Act above referred to and the said securities are now held by me in this office
in my official capacity as such Auditor of Public Accounts, for the uses and
purposes aforesaid.

         I further certify that by virtue of the Acts aforesaid, the NATIONAL
BUILDERS BANK OF CHICAGO is hereby authorized to accept and execute trusts and
receive deposits of trust funds under the provisions and limitations of "An Act
to provide for and regulate the administration of trusts in Illinois.


                    IN TESTIMONY WHEREOF, I hereunto subscribe my name and
                    affix the seal of my office, the day and year first above
(SEAL)              written.

                                                     /s/ Oscar Nelson
                                                     ----------------
                                                     AUDITOR OF PUBLIC ACCOUNTS.
                                                     STATE OF ILLINOIS.


<PAGE>   13



                                   NO. 13146.

   
                           TREASURY DEPARTMENT [LOGO]
    

                      OFFICE OF COMPTROLLER OF THE CURRENCY


                                            Washington, D.C., NOVEMBER 29, 1927.

         WHEREAS, by satisfactory evidence presented to the undersigned, it has
been made to appear that "NATIONAL BUILDERS BANK OF CHICAGO" in the CITY of
CHICAGO in the County of COOK and State of ILLINOIS has complied with all the
provisions of the Statutes of the United States, required to be complied with
before an association shall be authorized to commence the business of Banking;

         NOW THEREFORE I, J.W. MCINTOSH, Comptroller of the Currency, do hereby
certify that "NATIONAL BUILDERS BANK OF CHICAGO" in the CITY of CHICAGO in the
County of COOK and State of ILLINOIS is authorized to commence the business of
Banking as provided in Section Fifty one hundred and sixty nine of the Revised
Statutes of the United States.


                    IN TESTIMONY WHEREOF witness my hand and Seal of (SEAL)
(SEAL)              office this TWENTY-NINTH day of NOVEMBER, 1927.

                                                     /s/ J.W. McIntosh
                                                     ---------------------------
                                                     Comptroller of the Currency



<PAGE>   14



                    CERTIFICATE OF CHANGE OF CORPORATE TITLE

                                     [LOGO]

                                   NO. 13146.

                               TREASURY DEPARTMENT

                    OFFICE OF THE COMPTROLLER OF THE CURRENCY

                                                  WASHINGTON, D.C., MAY 1, 1940.

         WHEREAS, by satisfactory evidence presented to me, it appears that
under authority of sections 2, 3, and 4, of the Act of Congress approved May 1,
1886, entitled "An Act to enable national banking associations to increase their
capital stock and to change their names or location," shareholders owning
two-thirds of the stock of the national banking association heretofore known
as-- "NATIONAL BUILDERS BANK OF CHICAGO," located in CHICAGO, County of COOK,
State of ILLINOIS, have voted to change the name of said association to--
"LASALLE NATIONAL BANK," and have complied with all the provisions of the said
Act relative to national banking associations changing their name.

         NOW, THEREFORE, IT IS HEREBY CERTIFIED, that the name of the said
association has been changed to-- "LASALLE NATIONAL BANK," and that such change
of name is hereby approved under authority conferred by said Act.

(SEAL)

                    IN TESTIMONY WHEREOF, witness my hand and seal of office
                    this FIRST day of MAY, 1940.

                                             /s/
                                             -----------------------------------
                                             ACTING Comptroller of the Currency.



<PAGE>   15



                                    EXHIBIT 3

                            AUTHORIZATION TO EXERCISE
                             CORPORATE TRUST POWERS


<PAGE>   16



                              BOARD OF GOVERNORS
                                    OF THE

                     [FEDERAL RESERVE SYSTEM LETTERHEAD]

                                  WASHINGTON

                                                                     May 9, 1940

LaSalle National Bank,
Chicago, Illinois.

Gentlemen:

         The Board of Governors of the Federal Reserve System has been
officially advised by the Comptroller of the Currency that on May 1, 1940,
National Builders Bank of Chicago, Chicago, Illinois, changed its title to
LaSalle National Bank, and accordingly there is enclosed herewith a certificate
showing that LaSalle National Bank has authority to exercise the fiduciary
powers enumerated therein.

         Kindly acknowledge receipt of this certificate.

                                                Very truly yours,
        
                                                S. R. Carpenter
                                                ---------------
                                                S. R. Carpenter,
                                                Assistant Secretary.

Enclosure



<PAGE>   17



                               BOARD OF GOVERNORS
                                     OF THE
                             FEDERAL RESERVE SYSTEM
                                   WASHINGTON

          I, S. R. Carpenter, Assistant Secretary of the Board of Governors of
the Federal Reserve System (formerly known as the Federal Reserve Board), do
hereby certify that it appears from the records of the Board of Governors of the
Federal Reserve System that:

         (1) Pursuant to the authority vested in the Federal Reserve Board by an
Act of Congress approved December 23, 1913, known as the Federal Reserve Act, as
amended, the Federal Reserve Board on December 8, 1927, granted to National
Builders Bank of Chicago, Chicago, Illinois, the right to act, when not in
contravention of State or local law, as trustee, executor, administrator,
registrar of stocks and bonds, guardian of estates, assignee, receiver,
committee of estates of lunatics, or in any other fiduciary capacity in which
State banks, trust companies or other corporations which come into competition
with national banks are permitted to act under the laws of the State of
Illinois;

         (2) Under the provisions of an Act of Congress approved May 1, 1886,
National Builders Bank of Chicago, Chicago, Illinois, on May 1, 1940, changed
its title to LaSalle National Bank; and

         (3) By virtue of the foregoing, LaSalle National Bank, Chicago,
Illinois, has authority to act, when not in contravention of State or local law,
as trustee, executor, administrator, registrar of stocks and bonds, guardian of
estates, assignee, receiver, committee of estates of lunatics, or in any other
fiduciary capacity in which State banks, trust companies or other corporations
which come into competition with national banks are permitted to act under the
laws of the State of Illinois, subject to regulations prescribed by the Board of
Governors of the Federal Reserve System.

         IN WITNESS WHEREOF, I have hereunto subscribed my name and caused the
seal of the Board of Governors of the Federal Reserve System to be affixed at
the City of Washington in the District of Columbia.

                                                /s/ S. R. Carpenter
                                                -------------------
                                                Assistant Secretary.

Dated  May 9, 1940



<PAGE>   18



                                    EXHIBIT 4

                        BY-LAWS OF LA SALLE NATIONAL BANK


<PAGE>   19



                                     BYLAWS

                                       OF

                             LA SALLE NATIONAL BANK

                                CHICAGO, ILLINOIS

                          [LA SALLE NATIONAL BANK LOGO]

                    Organized Under the National Banking Laws
                              of the United States


<PAGE>   20



                                     BYLAWS

                                     of the

                             LA SALLE NATIONAL BANK

                (a National Banking Association which association
                      is herein referred to as the "bank")

                                    ARTICLE I

                            MEETINGS OF SHAREHOLDERS

         SECTION 1.1. ANNUAL MEETING. The regular annual meeting of the
shareholders for the election of directors and the transaction of whatever other
business may properly come before the meeting, shall be held at the main office
of the Bank, 135 South LaSalle Street, Chicago, Illinois, or such other place as
the Board of Directors may designate, at 9:00 A.M., on the third Wednesday of
March of each year. Notice of such meeting shall be mailed, postage prepaid, at
least ten days prior to the date thereof, addressed to each shareholder at his
address appearing on the books of the Bank. If for any cause, an election of
directors is not made on the said day, the Board of Directors shall order the
election to be held on some subsequent day as soon thereafter as practicable,
according to the provisions of law; and notice thereof shall be given in the
manner herein provided for the annual meeting.

         SECTION 1.2. SPECIAL MEETINGS. Except as otherwise specifically
provided by statute, special meetings of the shareholders may be called for any
purpose at anytime by the board of directors or by any three or more
shareholders owning, in the aggregate, not less than ten percent of the stock of
the bank. Every such special meeting, unless otherwise provided by law, shall be
called by mailing, postage pre-paid, not less than ten days prior to the date
fixed for such meeting, to each shareholder at his address appearing on the
books of the bank, a notice stating the purpose of the meeting.

         SECTION 1.3. NOMINATIONS FOR DIRECTOR. Nominations for election to the
board of directors may be made by the board of directors or by any shareholder
of any outstanding class of capital stock of the bank entitled to vote for the
election of directors. Nominations, other than those made by or on behalf of the
existing management of the bank, shall be made in writing and shall be delivered
or mailed to the president of the bank and to the Comptroller of the Currency,
Washington, D.C., not less than 14 days nor more than 50 days prior to any
meeting of shareholders called for the election of directors, provided, however,
that if less than 21 days' notice of the meeting is given to the shareholders,
such nomination shall be mailed or delivered to the president of the bank and to
the Comptroller of the Currency not later than the close of business on the
seventh day following the day on which the notice of meeting was mailed. Such
notification shall contain the following information to the extent known to the
notifying shareholder: (a) the name and address of each proposed nominee; (b)
the principal occupation of each proposed nominee; (c) the total number of
shares of capital stock of each proposed nominee; (d) the name and address of
the notifying shareholder; and (e) the number of shares of capital stock of the
bank owned by the notifying shareholder. Nominations not made in accordance
herewith, may, in his discretion, be disregarded by the chairman of the meeting,
and upon his instructions, the vote tellers may disregard all votes cast for
each such nominee.

         SECTION 1.4. JUDGES OF ELECTION. Every election of directors shall be
managed by three judges, who shall be appointed by the board of directors prior
lo the time of said election. The judges of election shall hold and conduct the
election at which they are appointed to serve; and after the election, they
shall file with the cashier a certificate under their hands, certifying the
result thereof and the names of the directors elected. The judges of



                                      1
<PAGE>   21


election. at the request of the chairman of the meeting, shall act as tellers
of any other vote by ballot taken at such meeting, and shall certify the result
thereof.

          SECTION 1.5. PROXIES. Shareholders may vote at any meeting of the
shareholders by proxies duly authorized in writing, but no officer or employee
of this bank shall act as proxy. Proxies shall be valid only for one meeting, to
be specified therein, and any adjournments of such meeting. Proxies shall be
dated and shall be filed with the records of the meeting.

          SECTION 1.6. QUORUM. A majority of the outstanding capital stock,
represented in person or by proxy, shall constitute a quorum at any meeting of
shareholders, unless otherwise provided by law; but less than a quorum may
adjourn any meeting, from time to time, and the meeting may be held, as
adjourned, without further notice. A majority of the votes cast shall decide
every question or matter submitted to the shareholders at any meeting, unless
otherwise provided by law or by the articles of association.

                                   ARTICLE II

                                    DIRECTORS

          SECTION 2.1. BOARD OF DIRECTORS. The board of directors (hereinafter
referred to as the "board"), shall have power to manage and administer the
business affairs of the bank. Except as expressly limited by law, all corporate
powers of the bank shall be vested in and may be exercised by said board.

          SECTION 2.2. NUMBER. The board shall consist of not less than five or
more than twenty-five shareholders, the exact number within such minimum and
maximum limits to be fixed and determined from time to time by resolution of a
majority of the full board or by resolution of the shareholders at any meeting
thereof; provided, however, that a majority of the full board may not increase
the number of directors by more than two if the number of directors last elected
by shareholders was fifteen or less and by not more than four where the number
of directors last elected by shareholders was sixteen or more, provided that in
no event shall the number of directors exceed twenty-five.

          SECTION 2.3. ORGANIZATION MEETING. The cashier, upon receiving the
certificate of the judges, of the result of any election, shall notify the
directors-elect of their election and of the time at which they are required to
meet at the main office of the bank for the purpose of organizing the new board
and electing and appointing officers of the bank for the succeeding year. Such
meeting shall be appointed to be held on the day of election or as soon
thereafter as practicable, and, in any event, within thirty days thereof. If, at
the time fixed for such meeting, there shall not be a quorum present the
directors present may adjourn the meeting, from time to time, until a quorum is
obtained.

          SECTlON 2.4 REGULAR MEETINGS. The regular meetings of the board shall
be held, without notice, on the third Wednesday of each month at the main
office. When any regular meeting of the board falls upon a holiday, the meeting
shall be held on the next banking business day unless the board shall designate
some other day.

          SECTION 2.5 SPECIAL MEETINGS. Special meetings of the board may be
called by the chairman of the board, the president, or at the request of three
or more directors. Each member of the board shall be given notice stating the
time and place, by telegram, letter or in person, of each such special meeting.

          SECTION 2.6. QUORUM. A majority of the directors shall constitute a
quorum at any meeting, except when otherwise provided by law; but a less number
may adjourn any meeting from time to time, and the meeting may be held, as
adjourned, without further notice.




                                       2
<PAGE>   22

          SECTION 2.7. VACANCIES. When any vacancy occurs among the directors,
the remaining members of the board, in accordance with the laws of the United
States, may appoint a director to fill such vacancy at any regular meeting of
the board, or at a special meeting called for that purpose.


          SECTION 2.8. RETIREMENT POLICY. A retirement policy adopted by the
board of directors shall be applicable to directors who are not active officers
of the bank.
        
                                   ARTICLE III

                             COMMITTEES OF THE BOARD

          SECTION 3.1. EXECUTIVE COMMITTEE. There shall be an executive 
committee of the board. The members of the executive committee shall be chosen
by the board from time to time, shall hold office during its pleasure, and
shall consist of the chairman of the board, the chairman of the executive
committee selected by the board, who may but need not be the same person
designated to be president, and the president, ex officio, and not less than
seven additional members of the board who shall not be active officers of the
bank. It shall be the duty of this committee to exercise such powers and
perform such duties in respect to the making of loans and discounts as shall
from time to time be specified by resolution of the board. During such periods
as the board shall not be in session, the executive committee shall have and
may exercise all the powers of the board except such as are by law or by these
bylaws required to be exercised only by the board. The executive committee may
make rules for holding and conducting its meetings and keep in the minute book
of the bank a report of all action taken which shall be submitted for approval
at each regular meeting of the board and the action of the board shall be
recorded in the minutes of that meeting. A quorum of the executive committee
shall consist of not less than five of its members, at least three of whom
shall not be active officers of the bank. The chairman of the board, or in his
absence in the order named if present, the chairman of the executive committee
or the president, may designate any director who is not an active officer of
the bank, or a designated member, to serve as a member of the executive
committee at any specified meeting. Vacancies in the executive committee at any
time existing may be filled by appointment by the board. The board may at
anytime revise or change the membership and chairmanship of the executive
committee and make new or additional appointments thereto. The chairman of the
executive committee shall be ex officio a member of all committees except the
examining committee and the trust audit committee, and shall have such other
duties as may from time to time be assigned him by the board.
        
          SECTION 3.2. OFFICERS' COMPENSATION COMMITTEE. There shall be an
officers' compensation committee of the board. The members of the officers'
compensation committee shall consist of the members ex officio provided for in
other sections of these bylaws and not less than three additional non-officer
members of the board who shall be appointed by the board each year at its first
meeting after the directors have been elected and qualified. It shall be the
duty of this committee to study the compensation of all officers of the bank and
from time to time report their recommendations to the board; and such other
duties, if any, as may from time to time be assigned to it by the board. A
majority of the committee, including at least two non-officer members, shall be
necessary for the committee to keep records of its action.

          SECTION 3.3. EXAMINING COMMITTEE. There shall be an examining 
committee of the board. The members of the examining committee shall consist of
the members ex officio provided for in other sections of these bylaws, but
exclusive of any active officer of the bank and not less than three additional
non-officer members of the board who shall be appointed by the board each year
at its first meeting after the directors have been elected and qualified. It
shall be the duty of this committee to make an examination at least twice each
year into the affairs of the bank or to cause the examinations to be made by
accountants (who may be the bank's own accountants) responsible only to the
board in such examinations, and to report the result of such examinations in
writing to the board at the next regular meeting thereafter, or it may, at its
sole discretion, submit the reports of the national bank examiner or of the
Chicago Clearing House Association examination, with or without additional
comments by the committee itself, for, and in lieu of its personal
examinations. Such reports shall state whether the bank is in sound
        


                                       3
<PAGE>   23


condition, whether adequate internal audit controls and procedures are
being maintained and shall recommend to the board such changes in the manner of
doing business or conducting the affairs of the bank as shall be deemed
advisable.

          SECTION 3.4. OTHER COMMITTEES. The board may appoint, from time to
time, from its own members, other committees of one or more persons, for such
purposes and with such powers as the board may determine.

                                   ARTICLE IV

                             OFFICERS AND EMPLOYEES

          SECTION 4.1. CHAIRMAN OF THE BOARD. The board shall appoint one of its
members to be chairman of the board. The chairman of the board shall supervise
the carrying out of the policies adopted or approved by the board. He shall have
general executive powers, as well as the specific powers conferred by these
bylaws. He shall be ex officio a member of all committees, except the examining
committee and the trust audit committee. He shall have general supervision and
direction of the business, affairs and personnel of the bank. He shall also have
and may exercise such further powers and duties as from time to time may be
conferred upon, or assigned to him by the board.

          SECTION 4. 2. VICE CHAIRMAN OF THE BOARD. The board may appoint one of
its members to be vice chairman of the board. He shall perform such duties as
may from time to time be assigned to him by the board.

          SECTION 4.3. PRESIDENT. The board shall appoint one of its members to
be president of the bank. He shall be the chief executive officer and the chief
administrative officer of the bank and in the absence of the chairman of the
board, he shall preside at any meeting of the board at which he is present. The
president shall have general executive powers, and shall have and may exercise
any and all other powers and duties pertaining by law, regulation, or practice
to the office of president, or imposed by these bylaws. He shall be ex officio a
member of all committees, except the examining committee and trust audit
committee. He shall have general supervision of the business, affairs and
personnel of the bank and in the absence of the chairman of the board, shall
exercise the powers and perform the duties of the chairman of the board. He
shall also have and may exercise such further powers and duties as from time to
time may be conferred upon or assigned to him by the board.

          SECTION 4.4. SENIOR OFFICERS. The board may appoint one or more
executive vice presidents and one or more senior vice presidents. Each such
senior officer shall have such powers and duties as may be assigned to him by
the board, the chairman of the board, or the president.

          SECTION 4.5. VICE PRESIDENT. The board may appoint one or more vice
presidents. Each vice president shall have such powers and duties as may be
assigned to him by the board, the chairman of the board, or the president.

          SECTION 4.6. CASHIER. The board shall appoint a cashier who shall have
such powers and duties as may be assigned to him by the board, the chairman
of the board, or the president. The cashier shall be custodian of the corporate
seal, records, documents and papers of the bank. He shall provide for keeping of
proper records of all transactions of the bank.

          SECTION 4.7. SECRETARY. The board shall appoint a secretary who shall
be secretary of the bank. He shall also perform such duties as may be assigned
to him from time to time by the board. The board may appoint a secretary of the
board who shall keep accurate minutes of all meetings. He shall attend to the
giving of all notices; he shall also perform such other duties as may be
assigned to him from time to time by the board.


                                       4

<PAGE>   24

          SECTION 4.8. OTHER OFFICERS. The board may appoint one or more
assistant vice presidents, one or more trust officers, one or more assistant
secretaries, one or more assistant cashiers, and such other officers and
attorneys-in-fact as from time to time may appear to the board to be required or
desirable to transact the business of the bank. Such officers, respectively,
shall exercise such powers and perform such duties as pertain to their several
offices or as may be conferred upon or assigned to them by the board the
chairman of the board or the president.

          SECTION 4.9. CLERKS AND AGENTS. The chairman of the board, the
president, or any other active officer of the bank authorized by the chairman of
the board, or the president, may appoint and dismiss all or any paying tellers
receiving tellers note tellers, vault custodians, bookkeepers and other clerks,
agents and employees as they may deem advisable for the prompt and orderly
transaction of the business of the bank, define their duties, fix the salaries
to be paid them and the conditions of their employment.

          SECTION 4.10. RESPONSIBILITY FOR MONEYS, ETC. Each of the active
officers and clerks of this bank shall be responsible for all moneys, funds
valuables and property of every kind and description that may from time to time
be entrusted to his care or placed in his hands by the board or others, or that
otherwise may come into his possession as an active officer or clerk of this
bank.

          SECTION 4.11. SURETY BONDS. All the active officers and clerks of this
bank may be covered by one of the blanket form bonds customarily written by the
surety companies, drawn for such an amount, and executed by such surety company,
as the board may from time to time require, and duly approve; or at the
discretion of the board, all such active officers and clerks shall, each for
himself, give such bond, with such security, and in such denominations as the
board may from time to time require and direct. All bonds approved by the board
shall assure the faithful and honest discharge of the respective duties of such
active officer or clerk and shall provide that such active officer or clerk
shall faithfully apply and account for all moneys, funds, valuables and property
of every kind and description that may from time to time come into his hands or
be entrusted to his care, and pay over and deliver the same to the order of the
board or to such other person or persons as may be authorized to demand and
receive the same.

          SECTION 4.12. TERM OF OFFICE - OFFICER DIRECTOR. The chairman of the
board, the vice chairman of the board and the president, together with any other
active officers who may be duly elected members of the board, shall hold their
respective offices for the current year for which the board (of which they shall
be members) was elected and until their successors are appointed, unless they
shall resign, be disqualified, or be removed; and any vacancy occurring in the
office of the chairman of the board, the vice chairman of the board, the
president, or in the board, shall, if required by these bylaws, be filled by the
remaining members.

          SECTION 4.13. TERM OF OFFICE - OFFICER. The executive vice presidents,
the senior vice presidents, the vice presidents, the assistant vice presidents,
the cashier, the secretary, the trust officers and all other officers and
attorneys-in-fact who are not duly elected members of the board, shall be
appointed to hold their offices, respectively, during the pleasure of the board.

                                    ARTICLE V

                                TRUST DEPARTMENT

          SECTION 5.1. TRUST DEPARTMENT. There shall be a department of the bank
known as the trust department which shall perform the fiduciary responsibilities
of the bank.

          SECTION 5.2. TRUST OFFICER. There shall be a senior vice president and
trust officer, or vice president and trust officer of this bank, who shall be
designated as the managing officer of the trust department and whose duties
shall be to manage, supervise and direct all the activities of the trust
department. He shall do, or cause


                                       5
<PAGE>   25


to be done, all things necessary or proper in carrying on the business of
the trust department in accordance with provisions of law and regulations.  He
shall act pursuant to opinion of counsel where such opinion is deemed necessary.
Opinions of counsel shall be retained on file in connection with all important
matters pertaining to fiduciary activities.  The trust officer shall be
responsible for all assets and documents held by the bank in connection with
fiduciary matters.

The board may appoint such other officers of the trust department as it may deem
necessary, with such duties as may be assigned to them by the board, the
chairman of the board, or the president.

         SECTION 5.3. TRUST INVESTMENT COMMITTEE. There shall be appointed by
the board a trust investment committee of this bank composed of not less than
four members, including members ex officio provided for in other sections of
these bylaws, who shall be capable and experienced officers or directors of the
bank. All investments of funds held in a fiduciary capacity shall be made,
retained or disposed of only with the approval of the trust investment
committee; and the committee shall keep minutes of all its meetings, showing the
disposition of all matters considered and passed upon by it. The committee
shall, promptly after the acceptance of an account for which the bank has
investment responsibilities, review the assets thereof, to determine the
advisability of retaining or disposing of such assets. The committee shall
conduct a similar review at least once during each calendar year thereafter and
within fifteen months of the last such review. A report of all such reviews,
together with the action taken as a result thereof, shall be noted in the
minutes of the committee. Three members of the trust investment committee shall
constitute a quorum, and any action approved by a majority of those present
shall constitute the action of the committee.

         SECTION 5.4. TRUST AUDIT COMMITTEE. The board shall appoint a committee
of not less than three directors, including members ex officio provided for in
other sections of these bylaws, exclusive of any active officers of the bank,
which shall at least once during each calendar year and within fifteen months of
the last such audit make suitable audits of the trust department, or cause
suitable audits to be made, by auditors responsible only to the board, and at
such time shall ascertain whether the department has been administered in
accordance with law, Regulation 9, and sound fiduciary principles.
Notwithstanding the provisions of this Section, the board at any time may assign
to the Examining Committee, in addition to the duties of the Examining Committee
set forth in Section 3.3 of these bylaws, all of the duties of the Trust Audit
Committee and during such time as the Examining Committee is performing the
duties of both committees, the Trust Audit Committee shall cease to function as
a committee of this board. The board at any time may reassign the duties
provided for in this Section to the Trust Audit Committee.

         SECTION 5.5. TRUST DEPARTMENT FILES. There shall be maintained in the
trust department, files containing all fiduciary records necessary to assure
that its fiduciary responsibilities have been properly undertaken and
discharged.

         SECTION 5.6. TRUST INVESTMENTS. Funds held in a fiduciary capacity
shall be invested in accordance with the instrument establishing the fiduciary
relationship and local law. Where such instrument does not specify the character
and class of investments to be made and does not vest in the bank a discretion
in the matter, fund shield pursuant to such instrument shall be invested in
investments in which corporate fiduciaries may invest under local law.

                                   ARTICLE VI

                          STOCK AND STOCK CERTIFICATES

         SECTION 6.1. TRANSFERS. Shares of capital stock shall be transferable
on the books of the bank and a transfer book shall be kept in which all
transfers of stock shall be recorded. Every person becoming a shareholder





                                      6
<PAGE>   26




be such transfer shall in proportion to his shares, succeed to all rights
and liabilities of the prior holder of such shares.

         SECTION 6.2. STOCK CERTIFICATES. Certificates of capital stock shall
bear the signature of any one of, the chairman of the board, or the president
(which may be engraved, printed or impressed) and shall be signed manually or by
facsimile process by the secretary, assistant secretary, cashier, assistant
cashier, or any other officer appointed by the board for that purpose, to be
known as an authorized officer and the seal of the bank shall be engraven
thereon. Each certificate shall recite on its face that the stock represented
thereby is transferable, properly endorsed, only on the books of the bank.


                                   ARTICLE VII

                                 CORPORATE SEAL

         SECTION 7.1. CORPORATE SEAL. The chairman of the board, the president,
the cashier, the secretary or any assistant cashier or assistant secretary, or
other officer thereunto designated by the board, shall have authority to affix
the corporate seal to any document requiring such seal, and to attest the same.
Such seal shall be substantially in the form set forth herein.

                                  ARTICLE VIII

                       INDEMNIFYING OFFICERS AND DIRECTORS

          SECTION 8.1. INDEMNIFYING OFFICERS AND DIRECTORS. Any person, his     
heirs, executors or administrators, may be indemnified or reimbursed by the
bank for reasonable expenses actually incurred in connection with any action,
suit or proceeding, civil or criminal, to which he or they shall be made a party
by reason of his being or having been a director, officer or employee of the
bank or of any firm, corporation or organization which he served in any such
capacity at the request of the bank; provided, however, that no person shall be
so indemnified or reimbursed in relation to any matter in such action, suit or
proceeding as to which he shall finally be adjudged to have been guilty of or
liable for negligence or willful misconduct in the performance of his duties to
the bank; and, provided further, that no person shall be so indemnified or
reimbursed in relation to any matter in such action, suit or proceeding which
has been made the subject of a compromise settlement except with the approval of
a court of competent jurisdiction, or the holders of record of a majority of the
outstanding shares of the bank, or the board, acting by vote of directors not
parties to the same or substantially the same action suit or proceeding,
constituting a majority of the whole number of the directors. The foregoing
right of indemnification or reimbursement shall not be exclusive of other rights
to which such person, his heirs, executors or administrators, may be entitled as
a matter of law.

                                   ARTICLE IX

                            MISCELLANEOUS PROVISIONS

          SECTION 9.1. FISCAL YEAR. The fiscal year of the bank shall be the
calendar year.

          SECTION 9.2. EXECUTION OF INSTRUMENTS. All agreements, indentures    
mortgages, deeds, conveyances transfers certificates declarations, receipts, 
discharges, releases, satisfactions, settlements, petitions, schedules, 
accounts, affidavits, bonds, undertakings, proxies and other instruments or     
documents may be signed, executed, acknowledged, verified, delivered or
accepted for the bank by the chairman of the board, or the vice chairman of the
board, or the president, or any executive vice president, or any senior vice
president, or any vice 

                                       7

<PAGE>   27


     
     
president, or the secretary or the cashier, or, if in connection with the
exercise of fiduciary powers of the bank by any of said officers or by any
officer in the trust department. Any such instruments may also be signed,
executed, acknowledged, verified, delivered or accepted for the bank in such
other manner and by such other officers as the board may from time to time
direct. The provisions of this Section 9.2 are supplementary to any other
provisions of these bylaws.

         SECTION 9.3. RECORDS. The articles of association, the bylaws, and the
proceedings of all meetings of the shareholders and of the board shall be
recorded in appropriate minute books provided for the purpose; where these
bylaws so provide, the proceedings of standing committees of the board shall be
recorded in appropriate minute books provided for the purpose.


                                    ARTICLE X

                                   EMERGENCIES

         SECTION 10.1. CONTINUATION OF BUSINESS. In the event of a state of
emergency of sufficient severity to interfere with the conduct and management of
the affairs of this bank, the officers and employees will continue to conduct
the affairs of the bank under such guidance from the directors as may be
available except as to matters which by statute require specific approval of the
board of directors and subject to conformance with any governmental directives
during the emergency.

         SECTION 10.2. DESIGNATION OF PLACE OF BUSINESS. The offices of the bank
at which its business shall be conducted shall be the main office thereof
located at 135 South LaSalle Street, Chicago, Illinois, and any other legally
authorized location which may be leased or acquired by this bank to carry on its
business. During an emergency resulting in any authorized place of business of
this bank being unable to function, the business ordinarily conducted at such
location shall be relocated elsewhere in suitable quarters, in addition to or in
lieu of the locations heretofore mentioned, as may be designated by the board of
directors or by the executive committee or by such persons as are then, in
accordance with resolutions adopted from time to time by the board of directors
dealing with the exercise of authority in the time of such emergency, conducting
the affairs of this bank. Any temporarily relocated place of business of this
bank shall be returned to its legally authorized location as soon as practicable
and such temporary place of business shall then be discontinued.

                                   ARTICLE XI

                                     BYLAWS

         SECTION 11.1 INSPECTION. A copy of the bylaws with all amendments
thereto, shall at all times be kept in a convenient place at the main office of
the bank and shall be open for inspection to all shareholders, during banking
hours.

         SECTION 11.2 AMENDMENTS. The bylaws may be amended, altered or
repealed, at any regular meeting of the board, by a vote of a majority of the
whole number of the directors.

                                       ***

          I........................................... hereby certify that I am
the................................ Cashier/Secretary of LaSalle National Bank, 
Chicago, Illinois and that the foregoing is a true and correct copy of the
bylaws of this bank as amended and that the same are in full force and effect
 ............ day of...................19........


                                      8
<PAGE>   28

                                                 ...............................
                                                 Cashier/Secretary.

December 15, 1982


                                                                          (SEAL)



                                      9
<PAGE>   29


                                    EXHIBIT 5

                                 NOT APPLICABLE



<PAGE>   30

                                    EXHIBIT 6

LaSalle National Bank hereby consents in accordance with the provisions of
Section 321(b) of the Trust Indenture Act of 1939, that reports of examinations
by Federal, State, Territorial and District authorities may be furnished by such
authorities to the Securities and Exchange Commission upon its request therefor.

                                                     LA SALLE NATIONAL BANK

                                                     By: /s/ Sarah H. Webb
                                                        ------------------------
                                                            Sarah H. Webb
                                                            First Vice President


<PAGE>   31



                                    EXHIBIT 7

                          Latest Report of Condition of
                          Trustee published pursuant to
                          law or the requirement of its
                        surviving or examining authority.


<PAGE>   32

<TABLE>
<S>  <C>
LaSalle National Bank              Call Dat 9/30/97          ST-BK:  17-1520            FFIEC       031 
135 South LaSalle Street                                                                Page     RC-1 
Chicago, IL  60603                 Vendor ID: D              CERT:  15407               11
</TABLE>

Transit Number:  71000505

CONSOLIDATED REPORT OF CONDITION FOR INSURED COMMERCIAL AND
STATE-CHARTERED SAVINGS BANKS FOR SEPTEMBER 30, 1997

All schedules are to be reported in thousands of dollars.  Unless otherwise
indicated, report the amount outstanding as of the last business day of the
quarter.

SCHEDULE RC - BALANCE SHEET


<TABLE>
<CAPTION>
                                                                               Dollar Amounts in Thousands
- ---------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>          <C>         <C>
ASSETS
1. Cash and balances due from depository institutions (from Schedule RC-A)      RCFD                                          
   a. Noninterest-bearing balances and currency and coin (1)                    0081          804,023   1.a                   
   b. Interest-bearing balances (2)                                             0071              634   1.b                   
2. Securities:                                                                                                                
   a. Held-to-maturity securities (from Schedule RC-B, column A)                1754          962,382   2.a                   
   b. Available-for-sale securities (from Schedule RC-B, column D)              1773        3,463,261   2.b                   
3. Federal funds sold and securities purchased under agreements to resell       1350           86,026   3.                    
4. Loans and lease financing  receivables:                                                                                    
   a. Loans and leases, net of unearned inc  RCFD                                                                             
       (from Schedule RC-C)                      2122  10,093,581                                           4.a                   
   b. LESS: Allowance for loan and lease losses  3123     191,670                                            4.b                   
   c. LESS: Allocated transfer risk reserve  3128          0                                            4.c                   
   d. Loans and leases, net of unearned income,                                                                               
       allowance, and reserve (item 4.a minus 4.b and 4.c)                      2125        9,901,911   4.d                   
5. Trading assets (from Schedule RC-D)                                          3545          153,080   5.                    
6. Premises and fixed assets (including capitalized leases)                     2145           50,587   6.                    
7. Other real estate owned (from Schedule RC-M)                                 2150            3,148   7.                    
8. Investments in unconsolidated subsidiaries and associated companies (from                                       
   Schedule RC-M)                                                               2130                0   8.                    
9. Customers' liability to this bank on acceptances outstanding                 2155           10,561   9.                    
10.Intangible assets (from Schedule RC-M)                                       2143           20,508   10.                   
11.Other assets (from Schedule RC-F)                                            2160          265,509   11.                   
12.Total assets (sum of items 1 through 11)                                     2170       15,721,630   12.
</TABLE> 

- -----------------
(1)  Includes cash items in process of collection and unposted debits.
(2)  Includes time certificates of deposit not held for trading.
<PAGE>   33

<TABLE>
<S> <C>
LaSalle National Bank              Call Dat 9/30/97          ST-BK:  17-1520            FFIEC       031
135 South LaSalle Street                                                                Page     RC-  2
Chicago, IL  60603                 Vendor ID: D              CERT:  15407                 12
</TABLE>

Transit Number:  71000505

Schedule RC - Continued
<TABLE>
<CAPTION>
                                                                               Dollar Amounts in Thousands
- -----------------------------------------------------------------------------------------------------------------
<S>                                                                             <C>          <C>         <C>
LIABILITIES
13.Deposits:
   a. In domestic offices (sum of totals of                                     RCON                                          
       columns A and C from Schedule RC-E, part I)                              2200        7,963,782   13.a                  

                                             RCON                                                                             
                                             ----
       (1) Noninterest-bearing (1)           6631  1,938,866                                            13.a.1                
       (2) Interest-bearing                  6636  6,024,916                                            13.a.2       
                                                                                RCFN                                          
   b. In foreign offices, Edge and Agreement subsidiaries, and IBFs (from                                          
       Schedule RC-E, part II)                                                  2200        2,064,214   13.b                  
                                             RCFN                                                                             
                                             ----
       (1) Noninterest-bearing               6631          0                                            13.b.1                
       (2) Interest-bearing                  6636  2,064,214                                            13.b.2                
                                                                                RCFD                                          
                                                                                ----
14.Federal funds purchased and securities sold under agreements to repurchase   2800        1,629,735   14.                   
                                                                                RCON                                          
                                                                                ----
15.a. Demand notes issued to the U.S. Treasury                                  2840          639,397   15.a                  
                                                                                RCFD                                          
                                                                                ----
   b. Trading liabilities (from Schedule RC-D)                                  3548           58,051   15.b                  
16.Other borrowed money (includes mortgage indebtedness and obligations under                                      
   capitalized leases):                                                                                                       
   a. With a remaining maturity of one year or less                             2332        1,562,441   16.a                  
   b. With a remaining maturity of more than one year through three years       A547           12,481   16.b                  
   c. With a remaining maturity of more than three years                        A548           15,687   16.c                  
17.Not applicable.                                                                                                            
18.Bank's liability on acceptances executed and outstanding                     2920           10,561   18.                   
19.Subordinated notes and debentures (2)                                        3200          396,250   19.                   
20.Other liabilities (from Schedule RC-G)                                       2930          333,248   20.                   
21.Total liabilities (sum of items 13 through 20)                               2948       14,685,847   21.         
22.Not applicable.                                                                                                            
                                                                                                                              
EQUITY CAPITAL                                                                                                                
                                                                                RCFD                                          
                                                                                ----
23.Perpetual preferred stock and related surplus                                3838                0   23.                   
24.Common stock                                                                 3230           18,417   24.                   
25.Surplus (exclude all surplus related to preferred stock)                     3839          275,636   25.                   
26.a. Undivided profits and capital reserves                                    3632          705,611   26.a                  
   b. Net unrealized holding gains (losses) on available-for-sale securities    8434           36,119   26.b                  
27.Cumulative foreign currency translation adjustments                          3284                0   27.                   
28.Total equity capital (sum of items 23 through 27)                            3210        1,035,783   28.          
29.Total liabilities and equity capital (sum of items 21 and 28)                3300       15,721,630   29.                   

Memorandum
To be reported only with the March Report of Condition.
1. Indicate in the box at the right the number of the statement below that best 
   describes the most comprehensive level of auditing work performed for the    RCFD         Number 
   bank by independent external auditors as of any date during 1996             ----         ------
                                                                                6724          N/A       M.1

</TABLE>

1 = Independent audit of the bank     4 = Directors' examination of the   
    conducted in accordance with          bank performed by other         
    generally accepted auditing           external auditors (may be       
    standards by a certified              required by state chartering    
    public accounting firm which          authority)                      
    submits a report on the bank      5 = Review of the bank's financial  
2 = Independent audit of the              statements by external auditors 
    bank's parent holding company     6 = Compilation of the bank's       
    conducted in accordance with          financial statements by         
    generally accepted auditing           external auditors               
    standards by a certified          7 = Other audit procedures          
    public accounting firm which          (excluding tax preparation work)
    submits a report on the           8 = No external audit work          
    consolidated holding company 
    (but not on the bank         
    separately)                  
3 = Directors' examination of the
    bank conducted in accordance
    with generally accepted
    auditing standards by a
    certified public accounting
    firm (may be required by state
    chartering authority)

- ------------------
(1)  Includes total demand deposits and noninterest-bearing time and savings
     deposits.
(2)  Includes limited-life preferred stock and related surplus.



<PAGE>   34



                                    EXHIBIT 8

                                 NOT APPLICABLE


<PAGE>   35


                                    EXHIBIT 9

                                 NOT APPLICABLE




<PAGE>   1

                                                                   EXHIBIT 25.2

                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549 
                            -----------------------

                                    FORM T-1

                   STATEMENT OF ELIGIBILITY AND QUALIFICATION
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE
                            -----------------------

                             LASALLE NATIONAL BANK
              (Exact name of trustee as specified in its charter)

                                   36-1521370
                                (I.R.S. Employer
                              Identification No.)

               135 South LaSalle Street, Chicago, Illinois 60603
              (Address of principal executive offices) (Zip Code)

                            -----------------------

                               M. ROBERT K. QUINN
                   Senior Vice President and General Counsel
                           Telephone: (312) 904-2010
                            135 South LaSalle Street
                            Chicago, Illinois 60603
           (Name, address and telephone number of agent for service)

                            -----------------------

                       WESTELL TECHNOLOGIES, INCORPORATED
              (Exact name of obligor as specified in its charter)

           Delaware                                             36-3154957
   (State or other jurisdiction                             (I.R.S. Employer
  incorporation or organization)                           Identification No.)


     750 North Commons Drive
         Aurora, Illinois
         (630) 898-2500                                            60504

(Address of Principal Executive Offices)                        (Zip Code)

   
                            -----------------------
                         Subordinated Debt Securities
                      (Title of the indenture securities)
    





<PAGE>   2

ITEM 1.      GENERAL INFORMATION

Furnish the following information as to the trustee:

        (a)  Name and address of each examining or supervising authority to
which it is subject.

             1.  Comptroller of the Currency, Washington D.C.

             2.  Federal Deposit Insurance Corporation, Washington, D.C.

             3.  The Board of Governors of the Federal Reserve Systems, 
                 Washington, D.C.

        (b)  Whether it is authorized to exercise corporate trust powers.

                 Yes.

ITEM 2.      AFFILIATIONS WITH OBLIGOR AND UNDERWRITERS.

If the obligor or any underwriter for the obligor is an affiliate of the
trustee, describe each such affiliation.

             Neither the obligor nor any underwriter for the obligor is an 
affiliate of the trustee.

ITEM 3.      VOTING SECURITIES OF THE TRUSTEE.

Furnish the following information as to each class of voting securities of the
trustee:

                                 Not applicable

ITEM 4.      TRUSTEESHIPS UNDER OTHER INDENTURES.

If the trustee is a trustee under another indenture under which any other
securities, or certificates of interest or participation in any other
securities, of the obligor are outstanding, furnish the following information:

             (a)   Title of securities outstanding under each other indenture.

   
                   It is anticipated that Senior Debt Securities may be issued
             in addition to the Subordinated Debt Securities.
    

             (b)   A brief statement of the facts relied upon as a basis for
             the claim that no conflicting interest within the meaning of
             Section 310(b)(1) of the   Act arises as a result of the
             trusteeship under such other indenture, including a statement as
             to how the indenture securities will rank as compared with the
             securities issued under such other indenture.

                   The two issues will rank pari-passu in terms of their 
             indebtedness and are therefore  without conflict pursuant to the 
             Trust Indenture Act.





<PAGE>   3

ITEM 5.      INTERLOCKING DIRECTORATES AND SIMILAR RELATIONSHIPS WITH THE 
OBLIGOR OR UNDERWRITERS.

If the trustee or any of the directors or executive officers of the trustee is
a director, officer, partner, employee, appointee, or representative of the
obligor or of any underwriter for the obligor, identify each such person having
any such connection and state the nature of each such connection.

                                 Not applicable

ITEM 6.      VOTING SECURITIES OF THE TRUSTEE OWNED BY THE OBLIGOR OR ITS
OFFICIALS.

Furnish the following information as to the voting securities of the trustee
owned beneficially by the obligor and each director, partner and executive
officer of the obligor.

                                 Not applicable

ITEM 7.      VOTING SECURITIES OF THE TRUSTEE OWNED BY UNDERWRITERS OR THEIR
OFFICIALS.

Furnish the following information as to the voting securities of the trustee
owned beneficially by each underwriter for the obligor and each director,
partner, and executive officer of each such underwriter.

                                 Not applicable

ITEM 8.      SECURITIES OF THE OBLIGOR OWNED OR HELD BY THE TRUSTEE.

Furnish the following information as to securities of the obligor owned
beneficially or held as collateral security for obligations in default by the
trustee:

                                 Not applicable

ITEM 9.      SECURITIES OF THE UNDERWRITER OWNED OR HELD BY THE TRUSTEE.

If the trustee owns beneficially or holds as collateral security for
obligations in default any securities of an underwriter for the obligor,
furnish the following information as to each class of securities of such
underwriter any of which are so owned or held by the trustee.

                                 Not applicable

ITEM 10.     OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF VOTING SECURITIES OF 
CERTAIN AFFILIATES OR SECURITY HOLDERS OF THE OBLIGOR.

If the trustee owns beneficially or holds as collateral security for
obligations in default voting securities of a person who, to the knowledge of
the trustee (1) owns 10 percent or more of the voting securities of the obligor
or (2) is an affiliate, other than a subsidiary, of the obligor, furnish the
following information as to the voting securities of such person.

                                 Not applicable





<PAGE>   4

ITEM 11.     OWNERSHIP OR HOLDINGS BY THE TRUSTEE OF ANY SECURITIES OF A PERSON
OWNING 50 PERCENT OR MORE OF THE VOTING SECURITIES OF THE OBLIGOR.

If the trustee owns beneficially or holds as collateral security for
obligations in default any securities of a person who, to the knowledge of the
trustee, owns 50 percent or more of the voting securities of the obligor,
furnish the following information as to each class of securities of such person
any of which are so owned or held by the trustee.

                                 Not applicable

ITEM 12.     INDEBTEDNESS OF THE OBLIGOR TO THE TRUSTEE.

If the obligor is indebted to the trustee, furnish the following information.

                                 Not applicable

ITEM 13.     DEFAULTS BY THE OBLIGOR.

a) State whether there is or has been a default with respect to the securities
under this indenture. Explain the nature of any such default.

                                 Not applicable

b) If the trustee is a trustee under another indenture under which any other
securities, or certificates of interest or participation in any other
securities, of the obligor are outstanding, or is trustee for more than one
outstanding series of securities under the indenture, state whether there has
been a default under any such indenture or series, identify the indenture or
series affected, and explain the nature of any such default.

                                 Not applicable

ITEM 14.     AFFILIATIONS WITH THE UNDERWRITERS.

If any underwriter is an affiliate of the trustee, describe each such
affiliation.

                                 Not applicable

ITEM 15.     FOREIGN TRUSTEE.

Identify the order or rule pursuant to which the foreign trustee is authorized
to act as sole trustee under indentures qualified or to be qualified.

                                 Not applicable

ITEM 16.     LIST OF EXHIBITS.

List below all exhibits filed as part of this statement of eligibility and
qualification.

             1.  A copy of the Articles of Association of LaSalle National Bank
                 now in effect.

             2.  A copy of the certificate of authority to commence business.

             3.  A copy of the authorization to exercise corporate trust powers.





<PAGE>   5

             4.  A copy of the existing By-Laws of LaSalle National Bank.

             5.  Not applicable.

             6.  The consent of the trustee required by Section 321(b) of the
                 Trust Indenture Act of 1939.

             7.  A copy of the latest report of condition of the trustee
                 published pursuant to law or the requirements of its 
                 supervising or examining authority.

             8.  Not applicable.

             9.  Not applicable.





<PAGE>   6

                                   SIGNATURE

Pursuant to the requirements of the Trust Indenture Act of 1939,the trustee,
LaSalle National Bank, a corporation organized and existing under the laws of
the United States of America, has duly caused this statement of eligibility and
qualification to be signed on its behalf by the undersigned, thereunto duly
authorized, all in the City of Chicago, State of Illinois, on the 21st day of
November, 1997.

                                        LASALLE NATIONAL BANK


                                        By:      /s/ Sarah H. Webb
                                                 ---------------------
                                                  Sarah H. Webb
                                                  First Vice President





<PAGE>   7

                                   EXHIBIT 1

                            ARTICLES OF ASSOCIATION





<PAGE>   8





                                    ARTICLES
                                       OF
                                  ASSOCIATION





                        [LA SALLE NATIONAL BANK LOGO]





                             LA SALLE NATIONAL BANK
                               CHICAGO, ILLINOIS





<PAGE>   9
                         [LASALLE NATIONAL BANK LOGO]


                            ARTICLES OF ASSOCIATION

         FIRST. The title of this association, which shall carry on the
business of banking under the laws of the United States shall be "LaSalle
National Bank."

         SECOND. The place where the main banking house or office of this
association shall be located, its operations of discount and deposit carried
on, and its general business conducted, shall be Chicago, County of Cook, State
of Illinois.

         THIRD. The Board of Directors of this association shall consist of
such number of its shareholders, not less than five nor more than twenty-five,
as from time to time shall be determined by a majority of the votes to which
all of its shareholders are at the time entitled. A majority of the Board of
Directors shall be necessary to constitute a quorum for the transaction of
business. The Board of Directors, by vote of a majority of the full board, may,
between annual meetings of shareholders increase the membership of the Board
where the number of directors last elected by shareholders was 15 or less, by
not more than two members, and where the number of directors last elected by
shareholders was 16 or more, by not more than four members and by a like vote
appoint qualified persons to fill the vacancies created thereby; provided that
the number of Directors shall at no time exceed twenty-five.

         FOURTH. The regular annual meeting of the shareholders of this
association shall be held at its main banking house, or other convenient place
duly authorized by the board of directors on such day of each year as is
specified therefor in the bylaws.

         FIFTH. The amount of capital stock which this association is
authorized to issue shall be Twenty Million Dollars ($20,000,000.00) divided
into 2,000,000 shares of common capital stock of the par value of $10.00 each;
but said capital stock may be increased or decreased from time to time, in
accordance with the provisions of the laws of the United States.

         If the capital stock is increased by the sale of additional shares
thereof, other than to key officers and employees of the association upon the
exercise of options granted pursuant to the terms of a stock option plan then
in effect, as to which sales all pre-emptive rights are waived, each
shareholder shall be entitled to subscribe for such additional shares in
proportion to the number of shares of said capital stock owned by him at the
time the increase is authorized by the shareholders, unless another time
subsequent to the date of the shareholders' meeting is specified in a
resolution adopted by the shareholders at the time the increase is authorized.
The board of directors shall have the power to prescribe a reasonable period of
time within which the pre-emptive rights to subscribe to the new shares of
capital stock may be exercised.

         The association, at any time and from time to time, may authorize and
issue debt obligations, whether or not subordinated, without the approval of
the shareholders.

         SIXTH. The board of directors shall appoint one of its members
president of this association, who shall be chairman of the board, but the
board of directors may appoint a director in lieu of the president to be
chairman of the board, who shall perform such duties as may be designated by
the board of directors. The board of directors shall have the power to appoint
one or more vice presidents, a cashier and such other officers as may be
required to transact the business of this association; to fix the salaries to
be paid to all officers of this association; and to dismiss such officers, or
any of them.





<PAGE>   10



         The board of directors shall have the power to define the duties of
officers and employees of this association, to require bonds from them, and to
fix the penalty thereof; to regulate the manner in which directors shall be
elected or appointed, and to appoint judges of the election; to make all bylaws
that it may be lawful for them to make for the general regulation of the
business of this association and the management of its affairs; and generally
to do and perform all acts that it may be lawful for a board of directors to do
and perform.

         SEVENTH. This association shall have succession from the date of its
organization certificate until such time as it be dissolved by act of its
shareholders in accordance with the provisions of the banking laws of the
United States, or until its franchise becomes forfeited by reason of violation
of law, or until terminated by either a general or a special act of Congress,
or until its affairs be placed in the hands of a receiver and finally wound up
by him.

         EIGHTH. The board of directors of this association, or any three or
more shareholders owning, in the aggregate, not less than ten per centum of the
stock of this association, may call a special meeting of shareholders at any
time: Provided, however, that, unless otherwise provided by law, not less than
ten days prior to the date fixed for any such meeting, a notice of the time,
place, and purpose of the meeting shall be given by first-class mail, postage
prepaid, to all shareholders of record of this association at their respective
addresses as shown upon the books of the association.  These articles of
association may be amended at any regular or special meeting of the
shareholders by the affirmative vote of the shareholders owning at least a
majority of the stock of this association, subject to the provisions of the
banking laws of the United States. The notice of any shareholders' meeting, at
which an amendment to the articles of association of this association is to be
considered, shall be given as herein-above set forth.

         NINTH. Any person, his heirs, executors, or administrators, may be
indemnified or reimbursed by the association for reasonable expenses actually
incurred in connection with any action, suit, or proceeding, civil or criminal,
to which he or they shall be made a party by reason of his being or having been
a director, officer, or employee of the association or of any firm,
corporation, or organization which he served in any such capacity at the
request of the association: Provided, however, that no person shall be so
indemnified or reimbursed in relation to any matter in such action, suit, or
proceeding as to which he shall finally be adjudged to have been guilty of or
liable for negligence or wilful misconduct in the performance of his duties to
the association: And, provided further, that no person shall be so indemnified
or reimbursed in relation to any matter in such action, suit, or proceeding
which has been made the subject of a compromise settlement except with the
approval of a court of competent jurisdiction, or the holders of record of a
majority of the outstanding shares of the association, or the board of
directors, acting by vote of directors not parties to the same or substantially
the same action, suit, or proceeding, constituting a majority of the whole
number of the directors. The foregoing right of indemnification or
reimbursement shall not be exclusive of other rights to which such person, his
heirs, executors, or administrators, may be entitled as a matter of law.

                                    ********

May 17, 1982
Form No. 181, Rev 5/17/82 GW





<PAGE>   11

                                   EXHIBIT 2

                            CERTIFICATE OF AUTHORITY
                              TO COMMENCE BUSINESS





<PAGE>   12

                               STATE OF ILLINOIS

                                AUDITOR'S OFFICE


NO.  333                             (LOGO)

                        NATIONAL BANK TRUST CERTIFICATE


                                                 Springfield, FEBRUARY 15th 1928


         I, OSCAR NELSON, Auditor of Public Accounts of the State of Illinois,
do hereby certify that the NATIONAL BUILDERS BANK OF CHICAGO located at
CHICAGO, County of COOK and State of Illinois, a corporation organized under
and by authority of the statutes of the United States governing National Banks
and authority granted by the Federal Reserve Act for the purpose of accepting
and executing trusts, has this day deposited in this office, securities in the
sum of TWO HUNDRED THOUSAND Dollars, $200,000.00 of the character designated by
Section 6 of the Act of the Legislature of the State of Illinois entitled "An
Act to provide for and regulate the administration of trusts by trust
companies,"
         The said deposit is made for the benefit of the creditors of said
NATIONAL BUILDERS BANK OF CHICAGO under and by virtue of the provisions of the
Act above referred to and the said securities are now held by me in this office
in my official capacity as such Auditor of Public Accounts, for the uses and
purposes aforesaid.
         I further certify that by virtue of the Acts aforesaid, the NATIONAL
BUILDERS BANK OF CHICAGO is hereby authorized to accept and execute trusts and
receive deposits of trust funds under the provisions and limitations of "An Act
to provide for and regulate the administration of trusts in Illinois.


                 IN TESTIMONY WHEREOF, I hereunto subscribe my name and affix 
(SEAL)           the seal of my office, the day and year first above written.



                                        /s/ Oscar Nelson
                                        ----------------
                                        AUDITOR OF PUBLIC ACCOUNTS.
                                        STATE OF ILLINOIS.





<PAGE>   13

                                   NO. 13146.


                           TREASURY DEPARTMENT (LOGO)

                     OFFICE OF COMPTROLLER OF THE CURRENCY


                                            Washington, D.C., NOVEMBER 29, 1927.


         WHEREAS, by satisfactory evidence presented to the undersigned, it has
been made to appear that "NATIONAL BUILDERS BANK OF CHICAGO" in the CITY of
CHICAGO in the County of COOK and State of ILLINOIS has complied with all the
provisions of the Statutes of the United States, required to be complied with
before an association shall be authorized to commence the business of Banking;

         NOW THEREFORE I, J.W. MCINTOSH, Comptroller of the Currency, do hereby
certify that "NATIONAL BUILDERS BANK OF CHICAGO" in the CITY of CHICAGO in the
County of COOK and State of ILLINOIS is authorized to commence the business of
Banking as provided in Section Fifty one hundred and sixty nine of the Revised
Statutes of the United States.


                 IN TESTIMONY WHEREOF witness my hand and Seal of (SEAL) 
(SEAL)           office this TWENTY-NINTH day of NOVEMBER, 1927.



                                        /s/ J.W. McIntosh
                                        -----------------
                                        Comptroller of the Currency





<PAGE>   14

                    CERTIFICATE OF CHANGE OF CORPORATE TITLE


                                     (LOGO)


                                   NO. 13146.

                              TREASURY DEPARTMENT

                   OFFICE OF THE COMPTROLLER OF THE CURRENCY



                                                  WASHINGTON, D.C., MAY 1, 1940.


         WHEREAS, by satisfactory evidence presented to me, it appears that
under authority of sections 2, 3, and 4, of the Act of Congress approved May 1,
1886, entitled "An Act to enable national banking associations to increase
their capital stock and to change their names or location," shareholders owning
two-thirds of the stock of the national banking association heretofore known
as-- "NATIONAL BUILDERS BANK OF CHICAGO," located in CHICAGO, County of COOK,
State of ILLINOIS, have voted to change the name of said association to--
"LASALLE NATIONAL BANK," and have complied with all the provisions of the said
Act relative to national banking associations changing their name.
         NOW, THEREFORE, IT IS HEREBY CERTIFIED, that the name of the said
association has been changed to-- "LASALLE NATIONAL BANK," and that such change
of name is hereby approved under authority conferred by said Act.



(SEAL)           IN TESTIMONY WHEREOF, witness my hand and seal of office this
                 FIRST day of MAY, 1940.


                                        /s/________________________________
                                        ACTING Comptroller of the Currency.





<PAGE>   15

                                   EXHIBIT 3

                           AUTHORIZATION TO EXERCISE
                             CORPORATE TRUST POWERS





<PAGE>   16

                               BOARD OF GOVERNORS
                                     OF THE
                      FEDERAL RESERVE SYSTEM [LETTERHEAD]

                                   WASHINGTON



                                                                     May 9, 1940

LaSalle National Bank,
Chicago, Illinois.

Gentlemen:

         The Board of Governors of the Federal Reserve System has been
officially advised by the Comptroller of the Currency that on May 1, 1940,
National Builders Bank of Chicago, Chicago, Illinois, changed its title to
LaSalle National Bank, and accordingly there is enclosed herewith a certificate
showing that LaSalle National Bank has authority to exercise the fiduciary
powers enumerated therein.

         Kindly acknowledge receipt of this certificate.

                                        Very truly yours,


                                        S. R. Carpenter
                                        ----------------
                                        S. R. Carpenter,
                                        Assistant Secretary.




Enclosure





<PAGE>   17

                               BOARD OF GOVERNORS
                                     OF THE
                             FEDERAL RESERVE SYSTEM
                                   WASHINGTON


         I, S. R. Carpenter, Assistant Secretary of the Board of Governors of
the Federal Reserve System (formerly known as the Federal Reserve Board), do
hereby certify that it appears from the records of the Board of Governors of
the Federal Reserve System that:

         (1) Pursuant to the authority vested in the Federal Reserve Board by
an Act of Congress approved December 23, 1913, known as the Federal Reserve
Act, as amended, the Federal Reserve Board on December 8, 1927, granted to
National Builders Bank of Chicago, Chicago, Illinois, the right to act, when
not in contravention of State or local law, as trustee, executor,
administrator, registrar of stocks and bonds, guardian of estates, assignee,
receiver, committee of estates of lunatics, or in any other fiduciary capacity
in which State banks, trust companies or other corporations which come into
competition with national banks are permitted to act under the laws of the
State of Illinois;

         (2) Under the provisions of an Act of Congress approved May 1, 1886,
National Builders Bank of Chicago, Chicago, Illinois, on May 1, 1940, changed
its title to LaSalle National Bank; and

         (3) By virtue of the foregoing, LaSalle National Bank, Chicago,
Illinois, has authority to act, when not in contravention of State or local
law, as trustee, executor, administrator, registrar of stocks and bonds,
guardian of estates, assignee, receiver, committee of estates of lunatics, or
in any other fiduciary capacity in which State banks, trust companies or other
corporations which come into competition with national banks are permitted to
act under the laws of the State of Illinois, subject to regulations prescribed
by the Board of Governors of the Federal Reserve System.


         IN WITNESS WHEREOF, I have hereunto subscribed my name and caused the
seal of the Board of Governors of the Federal Reserve System to be affixed at
the City of Washington in the District of Columbia.


                                        /s/ S. R. Carpenter
                                        --------------------
                                        Assistant Secretary.


Dated  May 9, 1940





<PAGE>   18

                                   EXHIBIT 4

                       BY-LAWS OF LA SALLE NATIONAL BANK





<PAGE>   19





                                     BYLAWS

                                       OF

                             LA SALLE NATIONAL BANK

                               CHICAGO, ILLINOIS





                         LA SALLE NATIONAL BANK (LOGO)





                   Organized Under the National Banking Laws
                              of the United States





<PAGE>   20

                                     BYLAWS

                                     of the

                             LA SALLE NATIONAL BANK


               (a National Banking Association which association
                      is herein referred to as the "bank")

                                   ARTICLE I

                            MEETINGS OF SHAREHOLDERS

         SECTION 1.1.     ANNUAL MEETING.  The regular annual meeting of the
shareholders for the election of directors and the transaction of whatever
other business may properly come before the meeting, shall be held at the main
office of the Bank, 135 South LaSalle Street, Chicago, Illinois, or such other
place as the Board of Directors may designate, at 9:00 A.M., on the third
Wednesday of March of each year. Notice of such meeting shall be mailed,
postage prepaid, at least ten days prior to the date thereof, addressed to each
shareholder at his address appearing on the books of the Bank. If for any
cause, an election of directors is not made on the said day, the Board of
Directors shall order the election to be held on some subsequent day as soon
thereafter as practicable, according to the provisions of law; and notice
thereof shall be given in the manner herein provided for the annual meeting.

         SECTION 1.2.     SPECIAL MEETINGS. Except as otherwise specifically
provided by statute, special meetings of the shareholders may be called for any
purpose at anytime by the board of directors or by any three or more
shareholders owning, in the aggregate, not less than ten percent of the stock
of the bank. Every such special meeting, unless otherwise provided by law,
shall be called by mailing, postage pre-paid, not less than ten days prior to
the date fixed for such meeting, to each shareholder at his address appearing
on the books of the bank, a notice stating the purpose of the meeting.

         SECTION 1.3.     NOMINATIONS FOR DIRECTOR. Nominations for election to
the board of directors may be made by the board of directors or by any
shareholder of any outstanding class of capital stock of the bank entitled to
vote for the election of directors. Nominations, other than those made by or on
behalf of the existing management of the bank, shall be made in writing and
shall be delivered or mailed to the president of the bank and to the
Comptroller of the Currency, Washington, D.C., not less than 14 days nor more
than 50 days prior to any meeting of shareholders called for the election of
directors, provided, however, that if less than 21 days' notice of the meeting
is given to the shareholders, such nomination shall be mailed or delivered to
the president of the bank and to the Comptroller of the Currency not later than
the close of business on the seventh day following the day on which the notice
of meeting was mailed. Such notification shall contain the following
information to the extent known to the notifying shareholder: (a) the name and
address of each proposed nominee; (b) the principal occupation of each proposed
nominee; (c) the total number of shares of capital stock of each proposed
nominee; (d) the  name and address of the notifying shareholder; and (e) the
number of shares of capital stock of the bank owned by the notifying
shareholder. Nominations not made in accordance herewith, may, in his
discretion, be disregarded by the chairman of the meeting, and upon his
instructions, the vote tellers may disregard all votes cast for each such
nominee.

         SECTION 1.4.     JUDGES OF ELECTION. Every election of directors shall
be managed by three judges, who shall be appointed by the board of directors
prior lo the time of said election. The judges of election shall hold and
conduct the election at which they are appointed to serve; and after the
election, they shall file with the cashier a certificate under their hands,
certifying the result thereof and the names of the directors elected. The
judges of





                                      1

<PAGE>   21

election. at the request of the chairman of the meeting, shall act as tellers
of any other vote by ballot taken at such meeting, and shall certify the result
thereof.

         SECTION 1.5.     PROXIES. Shareholders may vote at any meeting of the
shareholders by proxies duly authorized in writing, but no officer or employee
of this bank shall act as proxy. Proxies shall be valid only for one meeting,
to be specified therein, and any adjournments of such meeting. Proxies shall be
dated and shall be filed with the records of the meeting.

         SECTION 1.6.     QUORUM. A majority of the outstanding capital stock,
represented in person or by proxy, shall constitute a quorum at any meeting of
shareholders, unless otherwise provided by law; but less than a quorum may
adjourn any meeting, from time to time, and the meeting may be held, as
adjourned, without further notice. A majority of the votes cast shall decide
every question or matter submitted to the shareholders at any meeting, unless
otherwise provided by law or by the articles of association.


                                   ARTICLE II

                                   DIRECTORS

         SECTION 2.1.     BOARD OF DIRECTORS. The board of directors
(hereinafter referred to as the "board"), shall have power to manage and
administer the business affairs of the bank. Except as expressly limited by
law, all corporate powers of the bank shall be vested in and may be exercised
by said board.

         SECTION 2.2.     NUMBER. The board shall consist of not less than five
or more than twenty-five shareholders, the exact number within such minimum and
maximum limits to be fixed and determined from time to time by resolution of a
majority of the full board or by resolution of the shareholders at any meeting
thereof; provided, however, that a majority of the full board may not increase
the number of directors by more than two if the number of directors last
elected by shareholders was fifteen or less and by not more than four where the
number of directors last elected by shareholders was sixteen or more, provided
that in no event shall the number of directors exceed twenty-five.

         SECTION 2.3.     ORGANIZATION MEETING. The cashier, upon receiving the
certificate of the judges, of the result of any election, shall notify the
directors-elect of their election and of the time at which they are required to
meet at the main office of the bank for the purpose of organizing the new board
and electing and appointing officers of the bank for the succeeding year. Such
meeting shall be appointed to be held on the day of election or as soon
thereafter as practicable, and, in any event, within thirty days thereof. If,
at the time fixed for such meeting, there shall not be a quorum present the
directors present may adjourn the meeting, from time to time, until  a quorum
is obtained.

         SECTlON 2.4      REGULAR MEETINGS. The regular meetings of the board
shall be held, without notice, on the third Wednesday of each month at the main
office. When any regular meeting of the board falls upon a holiday, the meeting
shall be held on the next banking business day unless the board shall designate
some other day.

         SECTION 2.5      SPECIAL MEETINGS. Special meetings of the board may
be called by the chairman of the board, the president, or at the request of
three or more directors. Each member of the board shall be given notice stating
the time and place, by telegram, letter or in person, of each such special
meeting.

         SECTION 2.6.     QUORUM. A majority of the directors shall constitute
a quorum at any meeting, except when otherwise provided by law; but a less
number may adjourn any meeting from time to time, and the meeting may be held,
as adjourned, without further notice.





                                      2

<PAGE>   22


         SECTION 2.7.     VACANCIES. When any vacancy occurs among the
directors, the remaining members of the board, in accordance with the laws of
the United States, may appoint a director to fill such vacancy at any regular
meeting of the board, or at a special meeting called for that purpose.

         SECTION 2.8.     RETIREMENT POLICY. A retirement policy adopted by the
board of directors shall be applicable to directors who are not active officers
of the bank.


                                  ARTICLE III

                            COMMITTEES OF THE BOARD

         SECTION 3.1.     EXECUTIVE COMMITTEE. There shall be an executive
committee of the board. The members of the executive committee shall be chosen
by the board from time to time, shall hold office during its pleasure, and
shall consist of the chairman of the board, the chairman of the executive
committee selected by the board, who may but need not be the same person
designated to be president, and the president, ex officio, and not less than
seven additional members of the board who shall not be active officers of the
bank. It shall be the duty of this committee to exercise such powers and
perform such duties in respect to the making of loans and discounts as shall
from time to time be specified by resolution of the board. During such periods
as the board shall not be in session, the executive committee shall have and
may exercise all the powers of the board except such as are by law or by these
bylaws required to be exercised only by the board. The executive committee may
make rules for holding and conducting its meetings and keep in the minute book
of the bank a report of all action taken which shall be submitted for approval
at each regular meeting of the board and the action of the board shall be
recorded in the minutes of that meeting. A quorum of the executive committee
shall consist of not less than five of its members, at least three of whom
shall not be active officers of the bank. The chairman of the board, or in his
absence in the order named if present, the chairman of the executive committee
or the president, may designate any director who is not an active officer of
the bank, or a designated member, to serve as a member of the executive
committee at any specified meeting. Vacancies in the executive committee at any
time existing may be filled by appointment by the board. The board may at
anytime revise or change the membership and chairmanship of the executive
committee and make new or additional appointments thereto. The chairman of the
executive committee shall be ex officio a member of all committees except the
examining committee and the trust audit committee, and shall have such other
duties as may from time to time be assigned him by the board.

         SECTION 3.2.     OFFICERS' COMPENSATION COMMITTEE. There shall be an
officers' compensation committee of the board.  The members of the officers'
compensation committee shall consist of the members ex officio provided for in
other sections of these bylaws and not less than three additional non-officer
members of the board who shall be appointed by the board each year at its first
meeting after the directors have been elected and qualified. It shall be the
duty of this committee to study the compensation of all officers of the bank
and from time to time report their recommendations to the board; and such other
duties, if any, as may from time to time be assigned to it by the board. A
majority of the committee, including at least two non-officer members, shall be
necessary for the committee to keep records of its action.

         SECTION 3.3.     EXAMINING COMMITTEE. There shall be an examining
committee of the board. The members of the examining committee shall consist of
the members ex officio provided for in other sections of these bylaws, but
exclusive of any active officer of the bank and not less than three additional
non-officer members of the board who shall be appointed by the board each year
at its first meeting after the directors have been elected and qualified. It
shall be the duty of this committee to make an examination at least twice each
year into the affairs of the bank or to cause the examinations to be made by
accountants (who may be the bank's own accountants) responsible only to the
board in such examinations, and to report the result of such examinations in
writing to the board at the next regular meeting thereafter, or it may, at its
sole discretion, submit the reports of the national bank examiner or of the
Chicago Clearing House Association examination, with or without additional
comments by the committee itself, for, and in lieu of its personal
examinations. Such reports shall state whether the bank is in sound





                                      3

<PAGE>   23

condition, whether adequate internal audit controls and procedures are being
maintained and shall recommend to the board such changes in the manner of doing
business or conducting the affairs of the bank as shall be deemed advisable.

         SECTION 3.4.     OTHER COMMITTEES. The board may appoint, from time to
time, from its own members, other committees of one or more persons, for such
purposes and with such powers as the board may determine.


                                   ARTICLE IV

                             OFFICERS AND EMPLOYEES


         SECTION 4.1.     CHAIRMAN OF THE BOARD. The board shall appoint one of
its members to be chairman of the board. The chairman of the board shall
supervise the carrying out of the policies adopted or approved by the board. He
shall have general executive powers, as well as the specific powers conferred
by these bylaws. He shall be ex officio a member of all committees, except the
examining committee and the trust audit committee. He shall have general
supervision and direction of the business, affairs and personnel of the bank.
He shall also have and may exercise such further powers and duties as from time
to time may be conferred upon, or assigned to him by the board.

         SECTION 4. 2.    VICE CHAIRMAN OF THE BOARD. The board may appoint one
of its members to be vice chairman of the board. He shall perform such duties
as may from time to time be assigned to him by the board.

         SECTION 4.3.     PRESIDENT. The board shall appoint one of its members
to be president of the bank. He shall be the chief executive officer and the
chief administrative officer of the bank and in the absence of the chairman of
the board, he shall preside at any meeting of the board at which he is present.
The president shall have general executive powers, and shall have and may
exercise any and all other powers and duties pertaining by law, regulation, or
practice to the office of president, or imposed by these bylaws. He shall be ex
officio a member of all committees, except the examining committee and trust
audit committee. He shall have general supervision of the business, affairs and
personnel of the bank and in the absence of the chairman of the board, shall
exercise the powers and perform the duties of the chairman of the board. He
shall also have and may exercise such further powers and duties as from time to
time may be conferred upon or assigned to him by the board.

         SECTION 4.4.     SENIOR OFFICERS. The board may appoint one or more
executive vice presidents and one or more senior vice presidents.  Each such
senior officer shall have such powers and duties as may be assigned to him by
the board, the chairman of the board, or the president.

         SECTION 4.5.     VICE PRESIDENT. The board may appoint one or more
vice presidents. Each vice president shall have such powers and duties as may
be assigned to him by the board, the chairman of the board, or the president.

         SECTION 4.6.     CASHIER. The board shall appoint a cashier who shall
have such powers and duties as may be assigned to him by the board, the
chairman of the board, or the president. The cashier shall be custodian of the
corporate seal, records, documents and papers of the bank. He shall provide for
keeping of proper records of all transactions of the bank.

         SECTION 4.7.     SECRETARY. The board shall appoint a secretary who
shall be secretary of the bank. He shall also perform such duties as may be
assigned to him from time to time by the board. The board may appoint a
secretary of the board who shall keep accurate minutes of all meetings. He
shall attend to the giving of all notices; he shall also perform such other
duties as may be assigned to him from time to time by the board.





                                      4

<PAGE>   24


         SECTION 4.8.     OTHER OFFICERS. The board may appoint one or more
assistant vice presidents, one or more trust officers, one or more assistant
secretaries, one or more assistant cashiers, and such other officers and
attorneys-in-fact as from time to time may appear to the board to be required
or desirable to transact the business of the bank. Such officers, respectively,
shall exercise such powers and perform such duties as pertain to their several
offices or as may be conferred upon or assigned to them by the board the
chairman of the board or the president.

         SECTION 4.9.     CLERKS AND AGENTS. The chairman of the board, the
president, or any other active officer of the bank authorized by the chairman
of the board, or the president, may appoint and dismiss all or any paying
tellers receiving tellers note tellers, vault custodians, bookkeepers and other
clerks, agents and employees as they may deem advisable for the prompt and
orderly transaction of the business of the bank, define their duties, fix the
salaries to be paid them and the conditions of their employment.

         SECTION 4.10.    RESPONSIBILITY FOR MONEYS, ETC. Each of the active
officers and clerks of this bank shall be responsible for all moneys, funds
valuables and property of every kind and description that may from time to time
be entrusted to his care or placed in his hands by the board or others, or that
otherwise may come into his possession as an active officer or clerk of this
bank.

         SECTION 4.11.    SURETY BONDS. All the active officers and clerks of
this bank may be covered by one of the blanket form bonds customarily written
by the surety companies, drawn for such an amount, and executed by such surety
company, as the board may from time to time require, and duly approve; or at
the discretion of the board, all such active officers and clerks shall, each
for himself, give such bond, with such security, and in such denominations as
the board may from time to time require and direct. All bonds approved by the
board shall assure the faithful and honest discharge of the respective duties
of such active officer or clerk and shall provide that such active officer or
clerk shall faithfully apply and account for all moneys, funds, valuables and
property of every kind and description that may from time to time come into his
hands or be entrusted to his care, and pay over and deliver the same to the
order of the board or to such other person or persons as may be authorized to
demand and receive the same.

         SECTION 4.12.    TERM OF OFFICE - OFFICER DIRECTOR. The chairman of
the board, the vice chairman of the board and the president, together with any
other active officers who may be duly elected members of the board, shall hold
their respective offices for the current year for which the board (of which
they shall be members) was elected and until their successors are appointed,
unless they shall resign, be disqualified, or be removed; and any vacancy
occurring in the office of the chairman of the board, the vice chairman of the
board, the president, or in the board, shall, if required by these bylaws, be
filled by the remaining members.

         SECTION 4.13.    TERM OF OFFICE - OFFICER. The executive vice
presidents, the senior vice presidents, the vice presidents, the assistant vice
presidents, the cashier, the secretary, the trust officers and all other
officers and attorneys-in-fact who are not duly elected members of the board,
shall be appointed to hold their offices, respectively, during the pleasure of
the board.


                                   ARTICLE V

                                TRUST DEPARTMENT

         SECTION 5.1.     TRUST DEPARTMENT. There shall be a department of the
bank known as the trust department which shall perform the fiduciary
responsibilities of the bank.

         SECTION 5.2.     TRUST OFFICER. There shall be a senior vice president
and trust officer, or vice president and trust officer of this bank, who shall
be designated as the managing officer of the trust department and whose duties
shall be to manage, supervise and direct all the activities of the trust
department. He shall do, or cause





                                      5

<PAGE>   25

to be done, all things necessary or proper in carrying on the business of the
trust department in accordance with provisions of law and regulations. He shall
act pursuant to opinion of counsel where such opinion is deemed necessary.
Opinions of counsel shall be retained on file in connection with all important
matters pertaining to fiduciary activities. The trust officer shall be
responsible for all assets and documents held by the bank in connection with
fiduciary matters.

The board may appoint such other officers of the trust department as it may
deem necessary, with such duties as may be assigned to them by the board, the
chairman of the board, or the president.

         SECTION 5.3.     TRUST INVESTMENT COMMITTEE. There shall be appointed
by the board a trust investment committee of this bank composed of not less
than four members, including members ex officio provided for in other sections
of these bylaws, who shall be capable and experienced officers or directors of
the bank. All investments of funds held in a fiduciary capacity shall be made,
retained or disposed of only with the approval of the trust investment
committee; and the committee shall keep minutes of all its meetings, showing
the disposition of all matters considered and passed upon by it. The committee
shall, promptly after the acceptance of an account for which the bank has
investment responsibilities, review the assets thereof, to determine the
advisability of retaining or disposing of such assets. The committee shall
conduct a similar review at least once during each calendar year thereafter and
within fifteen months of the last such review. A report of all such reviews,
together with the action taken as a result thereof, shall be noted in the
minutes of the committee. Three members of the trust investment committee shall
constitute a quorum, and any action approved by a majority of those present
shall constitute the action of the committee.

         SECTION 5.4.     TRUST AUDIT COMMITTEE. The board shall appoint a
committee of not less than three directors, including members ex officio
provided for in other sections of these bylaws, exclusive of any active
officers of the bank, which shall at least once during each calendar year and
within fifteen months of the last such audit make suitable audits of the trust
department, or cause suitable audits to be made, by auditors responsible only
to the board, and at such time shall ascertain whether the department has been
administered in accordance with law, Regulation 9, and sound fiduciary
principles. Notwithstanding the provisions of this Section, the board at any
time may assign to the Examining Committee, in addition to the duties of the
Examining Committee set forth in Section 3.3 of these bylaws, all of the duties
of the Trust Audit Committee and during such time as the Examining Committee is
performing the duties of both committees, the Trust Audit Committee shall cease
to function as a committee of this board. The board at any time may reassign
the duties provided for in this Section to the Trust Audit Committee.

         SECTION 5.5.     TRUST DEPARTMENT FILES. There shall be maintained in
the trust department, files containing all fiduciary records necessary to
assure that its fiduciary responsibilities have been properly undertaken and
discharged.

         SECTION 5.6.     TRUST INVESTMENTS. Funds held in a fiduciary capacity
shall be invested in accordance with the instrument establishing the fiduciary
relationship and local law. Where such instrument does not specify the
character and class of investments to be made and does not vest in the bank a
discretion in the matter, fund shield pursuant to such instrument shall be
invested in investments in which corporate fiduciaries may invest under local
law.


                                   ARTICLE VI

                          STOCK AND STOCK CERTIFICATES

         SECTION 6.1.     TRANSFERS. Shares of capital stock shall be
transferable on the books of the bank and a transfer book shall be kept in
which all transfers of stock shall be recorded. Every person becoming a
shareholder





                                      6

<PAGE>   26

be such transfer shall in proportion to his shares, succeed to all rights and
liabilities of the prior holder of such shares.

         SECTION 6.2.     STOCK CERTIFICATES. Certificates of capital stock
shall bear the signature of any one of, the chairman of the board, or the
president (which may be engraved, printed or impressed) and shall be signed
manually or by facsimile process by the secretary, assistant secretary,
cashier, assistant cashier, or any other officer appointed by the board for
that purpose, to be known as an authorized officer and the seal of the bank
shall be engraven thereon.  Each certificate shall recite on its face that the
stock represented thereby is transferable, properly endorsed, only on the books
of the bank.


                                  ARTICLE VII

                                 CORPORATE SEAL

         SECTION 7.1.     CORPORATE SEAL. The chairman of the board, the
president, the cashier, the secretary or any assistant cashier or assistant
secretary, or other officer thereunto designated by the board, shall have
authority to affix the corporate seal to any document requiring such seal, and
to attest the same. Such seal shall be substantially in the form set forth
herein.


                                  ARTICLE VIII

                      INDEMNIFYING OFFICERS AND DIRECTORS

         SECTION 8.1.     INDEMNIFYING OFFICERS AND DIRECTORS. Any person, his
heirs, executors or administrators, may be indemnified or reimbursed by the
bank for reasonable expenses actually incurred in connection with any action,
suit or proceeding, civil or criminal, to which he or they shall be made a
party by reason of his being or having been a director, officer or employee of
the bank or of any firm, corporation or organization which he served in any
such capacity at the request of the bank; provided, however, that no person
shall be so indemnified or reimbursed in relation to any matter in such action,
suit or proceeding as to which he shall finally be adjudged to have been guilty
of or liable for negligence or willful misconduct in the performance of his
duties to the bank; and, provided further, that no person shall be so
indemnified or reimbursed in relation to any matter in such action, suit or
proceeding which has been made the subject of a compromise settlement except
with the approval of a court of competent jurisdiction, or the holders of
record of a majority of the outstanding shares of the bank, or the board,
acting by vote of directors not parties to the same or substantially the same
action suit or proceeding, constituting a majority of the whole number of the
directors. The foregoing right of indemnification or reimbursement shall not be
exclusive of other rights to which such person, his heirs, executors or
administrators, may be entitled as a matter of law.


                                   ARTICLE IX

                            MISCELLANEOUS PROVISIONS

         SECTION 9.1.     FISCAL YEAR. The fiscal year of the bank shall be the
calendar year.

         SECTION 9.2.     EXECUTION OF INSTRUMENTS. All agreements, indentures
mortgages, deeds, conveyances transfers certificates declarations, receipts,
discharges, releases, satisfactions, settlements, petitions, schedules,
accounts, affidavits, bonds, undertakings, proxies and other instruments or
documents may be signed, executed, acknowledged, verified, delivered or
accepted for the bank by the chairman of the board, or the vice chairman of the
board, or the president, or any executive vice president, or any senior vice





                                      7

<PAGE>   27

president, or any vice president, or the secretary or the cashier, or, if in
connection with the exercise of fiduciary powers of the bank by any of said
officers or by any officer in the trust department. Any such instruments may
also be signed, executed, acknowledged, verified, delivered or accepted for the
bank in such other manner and by such other officers as the board may from time
to time direct. The provisions of this Section 9.2 are supplementary to any
other provisions of these bylaws.

         SECTION 9.3.     RECORDS. The articles of association, the bylaws, and
the proceedings of all meetings of the shareholders and of the board shall be
recorded in appropriate minute books provided for the purpose; where these
bylaws so provide, the proceedings of standing committees of the board shall be
recorded in appropriate minute books provided for the purpose.


                                   ARTICLE X

                                  EMERGENCIES

         SECTION 10.1.    CONTINUATION OF BUSINESS. In the event of a state of
emergency of sufficient severity to interfere with the conduct and management
of the affairs of this bank, the officers and employees will continue to
conduct the affairs of the bank under such guidance from the directors as may
be available except as to matters which by statute require specific approval of
the board of directors and subject to conformance with any governmental
directives during the emergency.

         SECTION 10.2.    DESIGNATION OF PLACE OF BUSINESS. The offices of the
bank at which its business shall be conducted shall be the main office thereof
located at 135 South LaSalle Street, Chicago, Illinois, and any other legally
authorized location which may be leased or acquired by this bank to carry on
its business. During an emergency resulting in any authorized place of business
of this bank being unable to function, the business ordinarily conducted at
such location shall be relocated elsewhere in suitable quarters, in addition to
or in lieu of the locations heretofore mentioned, as may be designated by the
board of directors or by the executive committee or by such persons as are
then, in accordance with resolutions adopted from time to time by the board of
directors dealing with the exercise of authority in the time of such emergency,
conducting the affairs of this bank. Any temporarily relocated place of
business of this bank shall be returned to its legally authorized location as
soon as practicable and such temporary place of business shall then be
discontinued.


                                   ARTICLE XI

                                     BYLAWS

         SECTION 11.1     INSPECTION. A copy of the bylaws with all amendments
thereto, shall at all times be kept in a convenient place at the main office of
the bank and shall be open for inspection to all shareholders, during banking
hours.

         SECTION 11.2     AMENDMENTS. The bylaws may be amended, altered or
repealed, at any regular meeting of the board, by a vote of a majority of the
whole number of the directors.


                                      ***

         I........................................... hereby certify that I am
the................................ Cashier/Secretary of LaSalle National Bank,
Chicago, Illinois and that the foregoing is a true and correct copy of the
bylaws of this bank as amended and that the same are in full force and effect
 ............. day of...................19........





                                      8

<PAGE>   28




                                        ...............................
                                        Cashier/Secretary.



December 15, 1982



                                                                          (SEAL)





                                      9

<PAGE>   29

                                   EXHIBIT 5

                                 NOT APPLICABLE







<PAGE>   30

                                   EXHIBIT 6

LaSalle National Bank hereby consents in accordance with the provisions of
Section 321(b) of the Trust Indenture Act of 1939, that reports of examinations
by Federal, State, Territorial and District authorities may be furnished by
such authorities to the Securities and Exchange Commission upon its request
therefor.


                                        LA SALLE NATIONAL BANK


                                        By: /s/ Sarah H. Webb
                                            -----------------
                                               Sarah H. Webb
                                               First Vice President





<PAGE>   31

                                   EXHIBIT 7

                         Latest Report of Condition of
                         Trustee published pursuant to
                         law or the requirement of its
                       surviving or examining authority.





<PAGE>   32
<TABLE>
<S>                             <C>                           <C>                    <C>        <C>        <C>           
LaSalle National Bank            Call Date:  9/30/97           ST-BK:  17-1520        FFIEC               031       
135 South LaSalle Street                                                              Page       RC-1                   
Chicago, IL  60603               Vendor ID: D                   CERT:  15407            11                          
</TABLE>

Transit Number:  71000505

CONSOLIDATED REPORT OF CONDITION FOR INSURED COMMERCIAL AND
STATE-CHARTERED SAVINGS BANKS FOR SEPTEMBER 30, 1997

All schedules are to be reported in thousands of dollars.  Unless otherwise
indicated, report the amount outstanding as of the last business day of the 
quarter.

SCHEDULE RC - BALANCE SHEET

<TABLE>
<CAPTION>
                                                                                                       Dollar Amounts in Thousands
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                         <C>           <C>        <C>
ASSETS
1. Cash and balances due from depository institutions (from Schedule RC-A):                   RCFD
   a. Noninterest-bearing balances and currency and coin (1)                                   0081          804,023   1.a
   b. Interest-bearing balances (2)                                                            0071              634   1.b
2. Securities:                                                                                
   a. Held-to-maturity securities (from Schedule RC-B, column A)                               1754          962,382   2.a
   b. Available-for-sale securities (from Schedule RC-B, column D)                             1773        3,463,261   2.b
3. Federal funds sold and securities purchased under agreements to resell                      1350           86,026   3.
4. Loans and lease financing  receivables:                                                    
   a. Loans and leases, net of unearned income                     RCFD
       (from Schedule RC-C)                                        2122    10,093,581                                  4.a
   b. LESS: Allowance for loan and lease losses                    3123      191,670                                   4.b
   c. LESS: Allocated transfer risk reserve                        3128            0                                   4.c
   d. Loans and leases, net of unearned income,
       allowance, and reserve (item 4.a minus 4.b and 4.c)                                     2125        9,901,911   4.d
5. Trading assets (from Schedule RC-D)                                                         3545          153,080   5.
6. Premises and fixed assets (including capitalized leases)                                    2145           50,587   6.
7. Other real estate owned (from Schedule RC-M)                                                2150            3,148   7.
8. Investments in unconsolidated subsidiaries and associated companies (from                   
   Schedule RC-M)                                                                              2130                0   8.
9. Customers' liability to this bank on acceptances outstanding                                2155           10,561   9.
10.Intangible assets (from Schedule RC-M)                                                      2143           20,508   10.
11.Other assets (from Schedule RC-F)                                                           2160          265,509   11.
12.Total assets (sum of items 1 through 11)                                                    2170       15,721,630   12.      
</TABLE>

(1)  Includes cash items in process of collection and unposted debits.
(2)  Includes time certificates of deposit not held for trading.
<PAGE>   33


<TABLE>
<S>                              <C>                          <C>                      <C>          <C>           <C>
LaSalle National Bank            Call Date:  9/30/97          ST-BK:  17-1520          FFIEC                      031
135 South LaSalle Street                                                               Page 12        RC-2
Chicago, IL  60603               Vendor ID: D                 CERT:  15407                
</TABLE>
                                 
Transit Number:  71000505

SCHEDULE RC - CONTINUED

<TABLE>
<CAPTION>
                                                                                                       Dollar Amounts in Thousands
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                         <C>           <C>        <C>
LIABILITIES
13.Deposits:
   a. In domestic offices (sum of totals of                                                   RCON
       columns A and C from Schedule RC-E, part I)                                             2200        7,963,782   13.a
                                                                   RCON
       (1) Noninterest-bearing (1)                                 6631    1,938,866                                  13.a.1
       (2) Interest-bearing                                        6636    6,024,916                                  13.a.2 
                                                                                              RCFN
   b. In foreign offices, Edge and Agreement subsidiaries, and IBFs (from
       Schedule RC-E, part II)                                                                 2200        2,064,214   13.b
                                                                   RCFN
       (1) Noninterest-bearing                                     6631            0                                  13.b.1
       (2) Interest-bearing                                        6636    2,064,214                                  13.b.2
                                                                                              RCFD
14.Federal funds purchased and securities sold under agreements to repurchase                  2800        1,629,735   14.
                                                                                               RCON
15.a. Demand notes issued to the U.S. Treasury                                                 2840          639,397   15.a
                                                                                               RCFD
   b. Trading liabilities (from Schedule RC-D)                                                 3548           58,051   15.b
16.Other borrowed money (includes mortgage indebtedness and obligations under                  
   capitalized leases):                                                                        
   a. With a remaining maturity of one year or less                                            2332        1,562,441   16.a
   b. With a remaining maturity of more than one year through three years                      A547           12,481   16.b
   c. With a remaining maturity of more than three years                                       A548           15,687   16.c
17.Not applicable.                                                                             
18.Bank's liability on acceptances executed and outstanding                                    2920           10,561   18.
19.Subordinated notes and debentures (2)                                                       3200          396,250   19.
20.Other liabilities (from Schedule RC-G)                                                      2930          333,248   20.
21.Total liabilities (sum of items 13 through 20)                                              2948       14,685,847   21. 
22.Not applicable.                                                                             
                                                                                               
EQUITY CAPITAL                                                                                 
                                                                                              RCFD
23.Perpetual preferred stock and related surplus                                               3838                0   23.
24.Common stock                                                                                3230           18,417   24.
25.Surplus (exclude all surplus related to preferred stock)                                    3839          275,636   25.
26.a. Undivided profits and capital reserves                                                   3632          705,611   26.a
   b. Net unrealized holding gains (losses) on available-for-sale securities                   8434           36,119   26.b
27.Cumulative foreign currency translation adjustments                                         3284                0   27.
28.Total equity capital (sum of items 23 through 27)                                           3210        1,035,783   28. 
29.Total liabilities and equity capital (sum of items 21 and 28)                               3300       15,721,630   29.
                                                                                               
MEMORANDUM                                                                                     
TO BE REPORTED ONLY WITH THE MARCH REPORT OF CONDITION.                                        
1. Indicate in the box at the right the number of the statement below that best describes      
   the most comprehensive level of auditing work performed for the bank by independent        RCFD         Number
   external auditors as of any date during 1996                                                6724          N/A       M.1
</TABLE>                                                             

<TABLE>
<S>                                                                 <C>
1 =Independent audit of the bank conducted in accordance             4 = Directors' examination of the bank performed by other
   with generally accepted auditing standards by a certified               external auditors (may be required by state chartering
   public accounting firm which submits a report on the bank               authority)
2 =Independent audit of the bank's parent holding company            5 = Review of the bank's financial statements by external
   conducted in accordance with generally accepted auditing                auditors
   standards by a certified public accounting firm which             6 = Compilation of the bank's financial statements by
   submits a report on the consolidated holding company (but               external auditors
   not on the bank separately)                                       7 = Other audit procedures (excluding tax preparation work)
3 =Directors' examination of the bank conducted in accordance        8 = No external audit work
   with generally accepted auditing standards by a certified         
   public accounting firm (may be required by state charter-         
   ing authority)                                                    
</TABLE>
- ---------------
(1)  Includes total demand deposits and noninterest-bearing time and savings
     deposits.
(2)  Includes limited-life preferred stock and related surplus.
<PAGE>   34

                                   EXHIBIT 8

                                 NOT APPLICABLE





<PAGE>   35

                                   EXHIBIT 9

                                 NOT APPLICABLE







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