FRONTIER CORP /NY/
8-K, 1997-05-23
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 8-K
                                CURRENT REPORT

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

                         Date of Report: May 21, 1997
                       (Date of earliest event reported)

                             FRONTIER CORPORATION
            (Exact name of registrant as specified in its charter)


<TABLE> 

<S>                              <C>                                <C> 
New York                         Commission File No. 1-4166                     16-0613330
(State of incorporation)                                            (IRS Employer I.D. No.)

</TABLE> 

                           180 South Clinton Avenue
                           Rochester, NY 14646-0700
                   (Address of principal executive offices)

                                (716) 777-1000
              (Registrant's telephone number, including area code)


<PAGE>
 
Item 7.    Financial Statements and Exhibits.

<TABLE> 
<CAPTION> 

       (c)  Exhibits
            --------

       <S>                 <C>
             1.1           Underwriting Agreement, dated May 21, 1997, among Frontier
                           Corporation (the "Registrant") and Salomon Brothers Inc,
                           Lehman  Brothers Inc., Chase Securities Inc., and Morgan
                           Stanley & Co. Incorporated regarding the sale of $300,000,000
                           aggregate principal amount of the Registrant's 7.25% Notes
                           due 2004 (the "Notes")

             4.1           Indenture, dated as of May 21, 1997, between the Registrant and
                           The Chase Manhattan Bank, as Trustee

             4.2           Form of Note for the Notes

             5.1           Opinion of Martin T. McCue, Vice President Legal and Planning of the
                           Registrant, regarding the legality of the Notes

            25.1           Statement of Eligibility of Trustee on Form T-1

</TABLE> 

                                        2              
<PAGE>
 
                                  SIGNATURES

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

                                       FRONTIER CORPORATION,
                                       a New York corporation

Date: May 23, 1997                     By:  /s/ Louis L. Massaro
                                          --------------------------------
                                            Louis L. Massaro
                                            Executive Vice President,
                                            Chief Financial Officer &
                                            Chief Administrative Officer




                                       3
<PAGE>
 
                                 EXHIBIT INDEX

<TABLE> 
<CAPTION> 

Exhibit                                                          Filed
Number         Description                                      Herewith
- -------        -----------                                      --------
<S>            <C>                                              <C>
1.1            Underwriting Agreement, dated May 21, 1997,           X
               among Frontier Corporation (the "Registrant")
               and Salomon Brothers Inc, Lehman Brothers
               Inc., Chase Securities Inc., and Morgan Stanley
               & Co. Incorporated regarding the sale of
               $300,000,000 aggregate principal amount of
               the Registrant's 7.25% Notes due 2004 (the
               "Notes")

4.1            Indenture, dated as of May 21, 1997, between         X
               the Registrant and The Chase Manhattan Bank,
               as Trustee


4.2            Form of Note for the Notes                           X

5.1            Opinion of Martin T. McCue, Vice President           X
               Legal and Planning for the Registrant, regarding 
               the legality of the Notes

25.1           Statement of Eligibility of Trustee on Form T-1      X

</TABLE> 

<PAGE>

                                                                     Exhibit 1.1

 
                             Frontier Corporation

                            Underwriting Agreement

                                                              New York, New York

To the Representatives
   named in Schedule I
   hereto of the Under-
   writers named in
   Schedule II hereto


Ladies and Gentlemen:

          Frontier Corporation, a New York corporation (the "Company"), proposes
to sell to the underwriters named in Schedule II hereto (the "Underwriters"),
for whom you (the "Representatives"), are acting as representatives, the
principal amount of its securities identified in Schedule I hereto (the
"Securities"), to be issued under an indenture (the "Indenture") dated as of May
21, 1997 between the Company and The Chase Manhattan Bank, as trustee (the
"Trustee").

          1.  Representations and Warranties.  The Company represents and
              ------------------------------                             
warrants to, and agrees with, each Underwriter as set forth below in this
Section 1.  Certain terms used in this Section 1 are defined in paragraph (c)
hereof.

          (a)  The Company meets the requirements for the use of Form S-3
     under the Securities Act of 1933 (the "Act") and has filed with the
     Securities and Exchange Commission (the "Commission") a registration
     statement (the file number of which is set forth in Schedule I hereto) on
     such Form, including a basic prospectus, for registration under the Act of
     the offering and sale of the Securities. The Company may have filed one or
     more amendments thereto, and may have used a Preliminary Final Prospectus,
     each of which has previously been furnished to you. Such registration
     statement, as so amended, has become effective. The offering of the
     Securities is a Delayed Offering and, although the Basic Prospectus may not
     include all the information with respect to the Securities and the offering
     thereof required by the Act and the rules thereunder to be included in the
     Final Prospectus, the Basic Prospectus includes all such information
     required by the Act and the rules thereunder to be included therein as of
     the Execution Time. The Company will next file with the Commission pursuant
     to Rules 415 and 424(b)(2) or (5) a final supplement to the form of
     prospectus included in such registration statement relating to the
     Securities and the offering thereof. As filed, such final prospectus
     supplement shall include all required information with respect to the
     Securities and the offering thereof and, except to the extent the
     Representatives shall agree in writing to a modification, shall be in all
     substantive respects in the form furnished to you prior to the Execution
     Time or,
<PAGE>
 
     to the extent not completed at the Execution Time, shall contain only such
     specific additional information and other changes (beyond that contained in
     the Basic Prospectus and any Preliminary Final Prospectus) as the Company
     has advised you, prior to the Execution Time, will be included or made
     therein.

          (b)  On the Effective Date and at the Execution Time, the Registration
     Statement did or will, and when the Final Prospectus is first filed (if
     required) in accordance with Rule 424(b) and on the Closing Date, the Final
     Prospectus (and any supplement thereto) will, comply in all material
     respects with the applicable requirements of the Act, the Securities
     Exchange Act of 1934 (the "Exchange Act") and the Trust Indenture Act of
     1939 (the "Trust Indenture Act") and the respective rules thereunder; On
     the Effective Date and at the Execution Time, the Registration Statement
     did not or will not contain any untrue statement of a material fact or omit
     to state any material fact required to be stated therein or necessary in
     order to make the statements therein not misleading; On the Effective Date
     and at the Execution Time and on the Closing Date the Indenture did or will
     comply in all material respects with the requirements of the Trust
     Indenture Act and the rules thereunder; and on the date of any filing
     pursuant to Rule 424(b) and on the Closing Date, the Final Prospectus
     (together with any supplement thereto) will not include any untrue
     statement of a material fact or omit to state a material fact necessary in
     order to make the statements therein, in the light of the circumstances
     under which they were made, not misleading; provided, however, that the
                                                 --------  -------          
     Company makes no representations or warranties as to (i) that part of the
     Registration Statement which shall constitute the Statement of Eligibility
     and Qualification (Form T-1) under the Trust Indenture Act of the Trustee
     or (ii) the information contained in or omitted from the Registration
     Statement or the Final Prospectus (or any supplement thereto) in reliance
     upon and in conformity with information furnished in writing to the Company
     by or on behalf of any Underwriter through the Representatives specifically
     for inclusion in the Registration Statement or the Final Prospectus (or any
     supplement thereto).

          (c)  The terms which follow, when used in this Agreement, shall have
     the meanings indicated.  The term "the Effective Date" shall mean each date
     that the Registration Statement and any post-effective amendment or
     amendments thereto became or become effective.  "Execution Time" shall mean
     the date and time that this Agreement is executed and delivered by the
     parties hereto.  "Basic Prospectus" shall mean the basic prospectus
     referred to in the first sentence of paragraph (a) above contained in the
     Registration Statement at the Effective Date or, if such basic prospectus
     has been amended after the Effective Date, the basic prospectus as most
     recently amended and filed pursuant to Rule 424(b).  "Preliminary Final
     Prospectus" shall mean any preliminary prospectus supplement to the Basic
     Prospectus which describes the Securities and the offering thereof and is
     used prior to the filing of the Final Prospectus.  "Final Prospectus" shall
     mean the prospectus supplement relating to the Securities that is first
     filed pursuant to Rule 424(b) after the Execution Time, together with the
     Basic Prospectus.  "Registration Statement" shall mean the registration
     statement referred to in the first sentence of paragraph (a) above,
     including incorporated documents, exhibits and financial statements, as
     amended at the Execution Time and, in the event any post-effective
     amendment thereto becomes effective prior to the Closing Date (as
     hereinafter defined),

                                       2
<PAGE>
 
     shall also mean such registration statement as so amended. Such term shall
     include any Rule 430A Information deemed to be included therein at the
     Effective Date as provided by Rule 430A. "Rule 415", "Rule 424", "Rule
     430A" and "Regulation S-K" refer to such rules or regulation under the Act.
     "Rule 430A Information" means information with respect to the Securities
     and the offering thereof permitted to be omitted from the Registration
     Statement when it becomes effective pursuant to Rule 430A. Any reference
     herein to the Registration Statement, the Basic Prospectus, any Preliminary
     Final Prospectus or the Final Prospectus, shall be deemed to refer to and
     include the documents incorporated by reference therein pursuant to Item 12
     of Form S-3 which were filed under the Exchange Act on or before the
     Effective Date of the Registration Statement or the issue date of the Basic
     Prospectus, any Preliminary Final Prospectus or the Final Prospectus, as
     the case may be; and any reference herein to the terms "amend", "amendment"
     or "supplement" with respect to the Registration Statement, the Basic
     Prospectus, any Preliminary Final Prospectus or the Final Prospectus, shall
     be deemed to refer to and include the filing of any document under the
     Exchange Act after the Effective Date of the Registration Statement or the
     issue date of the Basic Prospectus, any Preliminary Final Prospectus or the
     Final Prospectus, as the case may be, deemed to be incorporated therein by
     reference. A "Delayed Offering" shall mean an offering of securities
     pursuant to Rule 415 which does not commence promptly after the effective
     date of a registration statement, with the result that only information
     required pursuant to Rule 415 need be included in such registration
     statement at the effective date thereof with respect to the securities so
     offered.

          2.  Purchase and Sale.  Subject to the terms and conditions and in
              -----------------                                             
reliance upon the representations and warranties herein set forth, the Company
agrees to sell to each Underwriter, and each Underwriter agrees, severally and
not jointly, to purchase from the Company, at the purchase price set forth in
Schedule I hereto, the principal amount of the Securities set forth opposite
such Underwriter's name in Schedule II hereto.

          3.  Delivery and Payment.  Delivery of and payment for the Securities
              --------------------                                             
shall be made on the date and at the time specified in Schedule I hereto (or
such later date not later than three business days after such specified date as
the Representatives shall designate), which date and time may be postponed by
agreement between the Representatives and the Company or as provided in Section
8 hereof (such date and time of delivery and payment for the Securities being
herein called the "Closing Date").  Delivery of the Securities shall be made to
the Representatives for the respective accounts of the several Underwriters
against payment by the several Underwriters through the Representatives of the
purchase price thereof to or upon the order of the Company by certified or
official bank check or checks drawn on or by a New York Clearing House bank and
payable in same-day funds.  Delivery of the Securities shall be made at such
location as the Representatives shall reasonably designate at least one business
day in advance of the Closing Date and payment for the Securities shall be made
at the office specified in Schedule I hereto.  Certificates for the Securities
shall be registered in such names and in such denominations as the
Representatives may request not less than three full business days in advance of
the Closing Date.

                                       3
<PAGE>
 
          The Company agrees to have the Securities available for inspection,
checking and packaging by the Representatives in New York, New York, not later
than 1:00 PM on the business day prior to the Closing Date.

          4.  Agreements.  The Company agrees with each of the Underwriters
              ----------                                                   
that:

          (a)  The Company will use its best efforts to cause the Registration
     Statement, if not effective at the Execution Time, and any amendment
     thereto, to become effective.  Prior to the termination of the offering of
     the Securities, the Company will not file any amendment of the Registration
     Statement or supplement (including the Final Prospectus or any Preliminary
     Final Prospectus) to the Basic Prospectus unless the Company has furnished
     you a copy for your review prior to filing and will not file any such
     proposed amendment or supplement to which you reasonably object.  Subject
     to the foregoing sentence, the Company will cause the Final Prospectus,
     properly completed, and any supplement thereto to be filed with the
     Commission pursuant to the applicable paragraph of Rule 424(b) within the
     time period prescribed and will provide evidence satisfactory to the
     Representatives of such timely filing.  The Company will promptly advise
     the Representatives (i) when the Registration Statement, if not effective
     at the Execution Time, and any amendment thereto, shall have become
     effective, (ii) when the Final Prospectus, and any supplement thereto,
     shall have been filed with the Commission pursuant to Rule 424(b), (iii)
     when, prior to termination of the offering of the Securities, any amendment
     to the Registration Statement shall have been filed or become effective,
     (iv) of any request by the Commission for any amendment of the Registration
     Statement or supplement to the Final Prospectus or for any additional
     information, (v) of the issuance by the Commission of any stop order
     suspending the effectiveness of the Registration Statement or the
     institution or threatening of any proceeding for that purpose and (vi) of
     the receipt by the Company of any notification with respect to the
     suspension of the qualification of the Securities for sale in any
     jurisdiction or the initiation or threatening of any proceeding for such
     purpose.  The Company will use its best efforts to prevent the issuance of
     any such stop order and, if issued, to obtain as soon as possible the
     withdrawal thereof.

          (b)  If, at any time when a prospectus relating to the Securities is
     required to be delivered under the Act, any event occurs as a result of
     which the Final Prospectus as then supplemented would include any untrue
     statement of a material fact or omit to state any material fact necessary
     to make the statements therein in the light of the circumstances under
     which they were made not misleading, or if it shall be necessary to amend
     the Registration Statement or supplement the Final Prospectus to comply
     with the Act or the Exchange Act or the respective rules thereunder, the
     Company promptly will prepare and file with the Commission, subject to the
     second sentence of paragraph (a) of this Section 4, an amendment or
     supplement which will correct such statement or omission or effect such
     compliance.

          (c)  As soon as practicable, the Company will make generally available
     to its security holders and to the Representatives an earnings statement or
     statements of the

                                       4
<PAGE>
 
     Company and its subsidiaries which will satisfy the provisions of Section
     11(a) of the Act and Rule 158 under the Act.

          (d)  The Company will furnish to the Representatives and counsel for
     the Underwriters, without charge, copies of the Registration Statement
     (including exhibits thereto) and, so long as delivery of a prospectus by an
     Underwriter or dealer may be required by the Act, as many copies of any
     Preliminary Final Prospectus and the Final Prospectus and any supplement
     thereto as the Representatives may reasonably request.  The Company will
     pay the expenses of printing or other production of all documents relating
     to the offering.

          (e)  Until the date set forth on Schedule I hereto, the Company will
     not, without the consent of the Representatives, offer, sell or contract to
     sell, or announce the offering of, any debt securities issued or guaranteed
     by the Company other than the Securities and up to $100 million aggregate
     principal amount of "putable" bonds offered pursuant to Rule 144A and
     Regulation S under the Act.

          5.  Conditions to the Obligations of the Underwriters.  The
              --------------------------------------------------     
obligations of the Underwriters to purchase the Securities shall be subject to
the accuracy of the representations and warranties on the part of the Company
contained herein as of the Execution Time and the Closing Date, to the accuracy
of the statements of the Company made in any certificates pursuant to the
provisions hereof, to the performance by the Company of its obligations
hereunder and to the following additional conditions:

          (a)  If the Registration Statement has not become effective prior to
     the Execution Time, unless the Representatives agree in writing to a later
     time, the Registration Statement will become effective not later than (i)
     6:00 PM New York City time, on the date of determination of the public
     offering price, if such determination occurred at or prior to 3:00 PM New
     York City time on such date or (ii) 12:00 Noon on the business day
     following the day on which the public offering price was determined, if
     such determination occurred after 3:00 PM New York City time on such date;
     if filing of the Final Prospectus, or any supplement thereto, is required
     pursuant to Rule 424(b), the Final Prospectus, and any such supplement,
     shall have been filed in the manner and within the time period required by
     Rule 424(b); and no stop order suspending the effectiveness of the
     Registration Statement shall have been issued and no proceedings for that
     purpose shall have been instituted or threatened.

          (b)  The Company shall have furnished to the Representatives the
     opinion of Martin T. McCue, counsel for the Company, dated the Closing
     Date, to the effect that:

               (i)  each of the Company and the subsidiaries of the Company set
          forth in Exhibit 21 to the Company's Annual Report filed on Form 10-K
          for the fiscal year ended December 31, 1996 (individually a
          "Subsidiary" and collectively the "Subsidiaries") has been duly
          incorporated and is validly existing as a corporation in good standing
          under the laws of the jurisdiction in which it is chartered or
          organized, with full corporate power and authority to own its
          properties and

                                       5
<PAGE>
 
          conduct its business as described in the Final Prospectus, and is duly
          qualified to do business as a foreign corporation and is in good
          standing under the laws of each jurisdiction which requires such
          qualification wherein it owns or leases material properties or
          conducts material business;

               (ii)  all the outstanding shares of capital stock of each
          Subsidiary have been duly and validly authorized and issued and are
          fully paid and nonassessable, and, except as otherwise set forth in
          the Final Prospectus, all outstanding shares of capital stock of the
          Subsidiaries are owned by the Company either directly or through
          wholly owned subsidiaries free and clear of any perfected security
          interest and, to the knowledge of such counsel, after due inquiry, any
          other security interests, claims, liens or encumbrances;

               (iii)  the Company's authorized equity capitalization is as set
          forth in the Final Prospectus; the Securities conform to the
          description thereof contained in the Final Prospectus;

               (iv)  the Indenture has been duly authorized, executed and
          delivered, has been duly qualified under the Trust Indenture Act, and
          constitutes a legal, valid and binding instrument enforceable against
          the Company in accordance with its terms (subject, as to enforcement
          of remedies, to applicable bankruptcy, reorganization, insolvency,
          moratorium or other laws affecting creditors' rights generally from
          time to time in effect); and the Securities have been duly authorized
          and, when executed and authenticated in accordance with the provisions
          of the Indenture and delivered to and paid for by the Underwriters
          pursuant to this Agreement, will constitute legal, valid and binding
          obligations of the Company entitled to the benefits of the Indenture
          (subject, as to enforcement of remedies, to applicable bankruptcy,
          reorganization, insolvency, moratorium or other laws affecting
          creditors' rights generally from time to time in effect);

               (v)  to the best knowledge of such counsel, there is no pending
          or threatened action, suit or proceeding before any court or
          governmental agency, authority or body or any arbitrator involving the
          Company or any of its subsidiaries, of a character required to be
          disclosed in the Registration Statement which is not adequately
          disclosed in the Final Prospectus, and there is no franchise, contract
          or other document of a character required to be described in the
          Registration Statement or Final Prospectus, or to be filed as an
          exhibit, which is not described or filed as required; and the
          statements included or incorporated in the Final Prospectus describing
          any legal proceedings or material contracts or agreements relating to
          the Company fairly summarize such matters;

               (vi)  the Registration Statement has become effective under the
          Act; any required filing of the Basic Prospectus, any Preliminary
          Final Prospectus and the Final Prospectus, and any supplements
          thereto, pursuant to Rule 424(b) has been made in the manner and
          within the time period required by Rule 424(b); to the best knowledge
          of such counsel, no stop order suspending the effectiveness of the

                                       6
<PAGE>
 
          Registration Statement has been issued, no proceedings for that
          purpose have been instituted or threatened, and the Registration
          Statement and the Final Prospectus (other than the financial
          statements and other financial and statistical information contained
          therein as to which such counsel need express no opinion) comply as to
          form in all material respects with the applicable requirements of the
          Act, the Exchange Act and the Trust Indenture Act and the respective
          rules thereunder; and such counsel has no reason to believe that on
          the Effective Date and at the Execution Time the Registration
          Statement contained any untrue statement of a material fact or omitted
          to state any material fact required to be stated therein or necessary
          to make the statements therein not misleading or that on the date of
          any filing pursuant to Rule 424(b) and on the Closing Date the Final
          Prospectus includes any untrue statement of a material fact or omits
          to state a material fact necessary to make the statements therein, in
          the light of the circumstances under which they were made, not
          misleading;

               (vii)  this Agreement has been duly authorized, executed and
          delivered by the Company;

               (viii)  no consent, approval, authorization or order of any court
          or governmental agency or body is required for the consummation of the
          transactions contemplated herein, except such as have been obtained
          under the Act and such as may be required under the blue sky laws of
          any jurisdiction in connection with the purchase and distribution of
          the Securities by the Underwriters and such other approvals (specified
          in such opinion) as have been obtained;

               (ix)  neither the issue and sale of the Securities, nor the
          consummation of any other of the transactions herein contemplated nor
          the fulfillment of the terms hereof will conflict with, result in a
          breach of, or constitute a default under the charter or by-laws of the
          Company or the terms of any indenture or other agreement or instrument
          known to such counsel and to which the Company or any of its
          subsidiaries is a party or bound, or any order or decree known to such
          counsel to be applicable to the Company or any of its subsidiaries of
          any court, regulatory body, administrative agency, governmental body
          or arbitrator having jurisdiction over the Company or any of its
          subsidiaries; and

               (x)  no holders of securities of the Company have rights to the
          registration of such securities under the Registration Statement.

          In rendering such opinion, such counsel may rely (A) as to matters
     involving the application of laws of any jurisdiction other than the State
     of New York or the United States, to the extent deemed proper and specified
     in such opinion, upon the opinion of other counsel of good standing
     believed to be reliable and who are satisfactory to counsel for the
     Underwriters and (B) as to matters of fact, to the extent deemed proper, on
     certificates of responsible officers of the Company and public officials.
     References to the Final Prospectus in this paragraph (b) include any
     supplements thereto at the Closing Date.

                                       7
<PAGE>
 
          (c)  The Company shall have furnished to the Representative the
     opinion of Jaffe, Raitt, Heuer & Weiss, special counsel to the Company,
     dated the Closing Date, to the effect that:

               (i) each of the Company and the Subsidiaries has been duly
          incorporated and is validly existing as a corporation in good standing
          under the laws of the jurisdiction in which it is chartered or
          organized, with full corporate power and authority to own its
          properties and conduct its business as described in the Final
          Prospectus;

               (ii)  the Indenture has been duly authorized, executed and
          delivered, has been duly qualified under the Trust Indenture Act, and
          constitutes a legal, valid and binding instrument enforceable against
          the Company in accordance with its terms (subject, as to enforcement
          of remedies, to applicable bankruptcy, reorganization, insolvency,
          moratorium or other laws affecting creditors' rights generally from
          time to time in effect); and the Securities have been duly authorized
          and, when executed and authenticated in accordance with the provisions
          of the Indenture and delivered to and paid for by the Underwriters
          pursuant to this Agreement, will constitute legal, valid and binding
          obligations of the Company entitled to the benefits of the Indenture
          (subject, as to enforcement of remedies, to applicable bankruptcy,
          reorganization, insolvency, moratorium or other laws affecting
          creditors' rights generally from time to time in effect);

               (iii) the statements included or incorporated in the Final
          Prospectus describing any legal proceedings known to such counsel or
          material contracts or agreements relating to the Company and known to
          such counsel fairly summarize such matters;

               (iv)  the Registration Statement has become effective under the
          Act; any required filing of the Basic Prospectus, any Preliminary
          Final Prospectus and the Final Prospectus, and any supplements
          thereto, pursuant to Rule 424(b) has been made in the manner and
          within the time period required by Rule 424(b); to the best knowledge
          of such counsel, no stop order suspending the effectiveness of the
          Registration Statement has been issued, no proceedings for that
          purpose have been instituted or threatened, and the Registration
          Statement and the Final Prospectus (other than the financial
          statements and other financial and statistical information contained
          therein as to which such counsel need express no opinion) comply as to
          form in all material respects with the applicable requirements of the
          Act, the Exchange Act and the Trust Indenture Act and the respective
          rules thereunder; and such counsel has no reason to believe that on
          the Effective Date and at the Execution Time the Registration
          Statement contained any untrue statement of a material fact or omitted
          to state any material fact required to be stated therein or necessary
          to make the statements therein not misleading or that on the date of
          any filing pursuant to Rule 424(b) and on the Closing Date the Final
          Prospectus included or includes any untrue statement of a material
          fact or omits to state a

                                       8
<PAGE>
 
          material fact necessary to make the statements therein, in the light
          of the circumstances under which they were made, not misleading;

               (v)  this Agreement has been duly authorized, executed and
          delivered by the Company;

               (vi)  neither the issue and sale of the Securities, nor the
          consummation of any other of the transactions herein contemplated nor
          the fulfillment of the terms hereof will conflict with, result in a
          breach of, or constitute a default under the charter or by-laws of the
          Company; and

               (vii)  no consent, approval, authorization or order of any court
          or governmental agency or body is required for the consummation of the
          transactions contemplated herein, except such as have been obtained
          under the Act and such as may be required under the blue sky laws of
          any jurisdiction in connection with the purchase and distribution of
          the Securities by the Underwriters and such other approvals (specified
          in such opinion) as have been obtained.

          In rendering such opinion, such counsel may rely (A) as to matters
     involving the application of laws of any jurisdiction other than the State
     of Michigan or the United States, to the extent deemed proper and specified
     in such opinion, upon the opinion of other counsel of good standing
     believed to be reliable and who are satisfactory to counsel for the
     Underwriters (including, in the case of the laws of the State of New York,
     upon the opinion of Martin T. McCue) and (B) as to matters of fact, to the
     extent deemed proper, on certificates of responsible officers of the
     Company and public officials.  References to the Final Prospectus in this
     paragraph (c) include any supplements thereto at the Closing Date.

          (d)  The Representatives shall have received from Cleary, Gottlieb,
     Steen & Hamilton, counsel for the Underwriters, such opinion or opinions,
     dated the Closing Date, with respect to the issuance and sale of the
     Securities, the Indenture,  the Registration Statement, the Final
     Prospectus (together with any supplement thereto) and other related matters
     as the Representatives may reasonably require, and the Company shall have
     furnished to such counsel such documents as they request for the purpose of
     enabling them to pass upon such matters.

          (e)  The Company shall have furnished to the Representatives a
     certificate of the Company, signed by the Chairman of the Board or the
     President and the principal financial or accounting officer of the Company,
     dated the Closing Date, to the effect that the signer of such certificate
     has carefully examined the Registration Statement, the Final Prospectus,
     any supplement to the Final Prospectus and this Agreement and that:

               (i)  the representations and warranties of the Company in this
          Agreement are true and correct in all material respects on and as of
          the Closing Date with the same effect as if made on the Closing Date
          and the Company has complied with

                                       9
<PAGE>
 
          all the agreements and satisfied all the conditions on its part to be
          performed or satisfied at or prior to the Closing Date;

               (ii)  no stop order suspending the effectiveness of the
          Registration Statement has been issued and no proceedings for that
          purpose have been instituted or, to the Company's knowledge,
          threatened; and

               (iii)  since the date of the most recent financial statements
          included in the Final Prospectus (exclusive of any supplement
          thereto), there has been no material adverse change in the condition
          (financial or other), earnings, business or properties of the Company
          and its subsidiaries, whether or not arising from transactions in the
          ordinary course of business, except as set forth in or contemplated in
          the Final Prospectus (exclusive of any supplement thereto).

          (f)  At the Closing Date, Price Waterhouse LLP shall have furnished to
     the Representatives a letter or letters (which may refer to letters
     previously delivered to one or more of the Representatives), dated as of
     the Closing Date, in form and substance satisfactory to the
     Representatives, confirming that they are independent accountants within
     the meaning of the Act and the Exchange Act and the respective applicable
     published rules and regulations thereunder and stating in effect that:

               (i)  in their opinion the audited consolidated financial
          statements and financial statement schedule incorporated by reference
          in the Registration Statement and the Final Prospectus and reported on
          by them comply in form in all material respects with the applicable
          accounting requirements of the Act and the Exchange Act and the
          related published rules and regulations thereunder with respect to the
          Registration Statement;

               (ii)  on the basis of procedures (but not an audit in accordance
          with generally accepted auditing standards) consisting of:

               (a) reading the minutes of meetings of the stockholders, the
          Board of Directors and the audit and executive committees of the Board
          of Directors of the Company and its consolidated subsidiaries since
          December 31, 1996 as set forth in the minute books through a specified
          date not more than five business days prior to the date of delivery of
          such letter;

               (b) performing the procedures specified by the American Institute
          of Certified Public Accounts for a review of interim financial
          information as described in SAS No. 71, Interim Financial Information,
          on the unaudited condensed interim financial statements of the Company
          and its consolidated subsidiaries incorporated by reference in the
          Registration Statement and Final Prospectus and reading the unaudited
          interim financial data for the period from the date of the latest
          balance sheet incorporated by reference in the Registration Statement
          and Final Prospectus to the date of the latest available interim
          financial data; and

                                       10
<PAGE>
 
               (c) making inquiries of certain officials of the Company who have
          responsibility for financial and accounting matters regarding the
          specific items for which representations are requested below;

          nothing has come to their attention as a result of the foregoing
          procedures that caused them to believe that:

                    (1)  any unaudited condensed interim financial statements
               included or incorporated in the Registration Statement and the
               Final Prospectus do not comply in form in all material respects
               with applicable accounting requirements and with the published
               rules and regulations of the Commission with respect to financial
               statements included or incorporated in quarterly reports on Form
               10-Q under the Exchange Act; and said unaudited condensed interim
               financial statements are not in conformity with generally
               accepted accounting principles applied on a basis substantially
               consistent with that of the audited financial statements included
               or incorporated in the Registration Statement and the Final
               Prospectus;

                    (2)  with respect to the period subsequent to the date of
               the most recent unaudited condensed interim financial statements
               (other than any capsule information), audited or unaudited,
               included or incorporated in the Registration Statement and the
               Final Prospectus, there were any changes, at a specified date not
               more than five business days prior to the date of the letter, in
               the long-term debt of the Company and its subsidiaries or capital
               stock of the Company or decreases in the shareowners' equity of
               the Company or decreases in working capital of the Company and
               its subsidiaries consolidated as compared with the amounts shown
               on the most recent consolidated balance sheet included or
               incorporated in the Registration Statement and the Final
               Prospectus, or for the period from the date of the most recent
               unaudited condensed interim financial statements included or
               incorporated in the Registration Statement and the Final
               Prospectus to such specified date not more than five business
               days prior to the date of the letter there were any decreases, as
               compared with the corresponding period in the preceding year, in
               revenues, operating income or in total or per share amounts of
               net income of the Company and its subsidiaries, except in all
               instances for changes or decreases which the Registration
               Statement discloses have occurred or may occur, or as set forth
               in such letter, in which case the letter shall be accompanied by
               an explanation by the Company as to the significance thereof
               unless said explanation is not deemed necessary by the
               Representatives; or

                    (3)  the amounts included in any unaudited "capsule"
               information included or incorporated in the Registration
               Statement and the Final Prospectus do not agree with the amounts
               set forth in the unaudited financial statements for the same
               periods or were not determined on a

                                       11
<PAGE>
 
               basis substantially consistent with that of the corresponding
               amounts in the audited financial statements included or
               incorporated in the Registration Statement and the Final
               Prospectus;

               (iii)  they have performed certain other specified procedures as
          a result of which they determined that certain information of an
          accounting, financial or statistical nature (which is limited to
          accounting, financial or statistical information derived from the
          general accounting records of the Company and its subsidiaries) set
          forth in the Registration Statement and the Final Prospectus and in
          Exhibit 12 to the Registration Statement, including the information
          included or incorporated in Items 1, 2, 6, 7, 8, 11 and 14 of the
          Company's Annual Report on Form 10-K, incorporated in the Registration
          Statement and the Prospectus, and the information included in the
          "Management's Discussion and Analysis of Financial Condition and
          Results of Operations" included or incorporated in the Company's
          Quarterly Reports on Form 10-Q, incorporated in the Registration
          Statement and the Final Prospectus, agrees with the accounting records
          of the Company and its subsidiaries, excluding any questions of legal
          interpretation; and

          References to the Final Prospectus in this paragraph (f) include any
     supplement thereto at the date of the letter.

          In addition, except as provided in Schedule I hereto, at the Execution
     Time, Price Waterhouse LLP shall have furnished to the Representatives a
     letter or letters, dated as of the Execution Time, in form and substance
     satisfactory to the Representatives, to the effect set forth above.

          (g)  Subsequent to the Execution Time or, if earlier, the dates as of
     which information is given in the Registration Statement (exclusive of any
     amendment thereof) and the Final Prospectus (exclusive of any supplement
     thereto), there shall not have been (i) any change or decrease specified in
     the letter or letters referred to in paragraph (f) of this Section 5 or
     (ii) any change, or any development involving a prospective change, in or
     affecting the business or properties of the Company and its subsidiaries
     the effect of which, in any case referred to in clause (i) or (ii) above,
     is, in the judgment of the Representatives, so material and adverse as to
     make it impractical or inadvisable to proceed with the offering or the
     delivery of the Securities as contemplated by the Registration Statement
     (exclusive of any amendment thereof) and the Final Prospectus (exclusive of
     any supplement thereto).

          (h)  Subsequent to the Execution Time, there shall not have been any
     decrease in the ratings of any of the Company's debt securities by any
     "nationally recognized statistical rating organization" (as defined for
     purposes of Rule 436(g) under the Act) or any notice given of any intended
     or potential decrease in any such rating or of a possible change in any
     such rating that does not indicate the direction of the possible change.

                                       12
<PAGE>
 
          (i)  Prior to the Closing Date, the Company shall have furnished to
     the Representatives such further information, certificates and documents as
     the Representatives may reasonably request.

          If any of the conditions specified in this Section 5 shall not have
been fulfilled in all material respects when and as provided in this Agreement,
or if any of the opinions and certificates mentioned above or elsewhere in this
Agreement shall not be in all material respects reasonably satisfactory in form
and substance to the Representatives and counsel for the Underwriters, this
Agreement and all obligations of the Underwriters hereunder may be canceled at,
or at any time prior to, the Closing Date by the Representatives.  Notice of
such cancellation shall be given to the Company in writing or by telephone or
telecopy confirmed in writing.

          6.  Reimbursement of Underwriters' Expenses.  If the sale of the
              ---------------------------------------                     
Securities provided for herein is not consummated because any condition to the
obligations of the Underwriters set forth in Section 5 hereof is not satisfied,
because of any termination pursuant to Section 9 hereof or because of any
refusal, inability or failure on the part of the Company to perform any
agreement herein or comply with any provision hereof, in each case other than by
reason of a default by any of the Underwriters, the Company will reimburse the
Underwriters severally upon demand for all out-of-pocket expenses (including
reasonable fees and disbursements of counsel) that shall have been incurred by
them in connection with the proposed purchase and sale of the Securities.

          7.  Indemnification and Contribution.  (a)  The Company agrees to
              --------------------------------                             
indemnify and hold harmless each Underwriter, the directors, officers, employees
and agents of each Underwriter and each person who controls any Underwriter
within the meaning of either the Act or the Exchange Act against any and all
losses, claims, damages or liabilities, joint or several, to which they or any
of them may become subject under the Act, the Exchange Act or other Federal or
state statutory law or regulation, at common law or otherwise, insofar as such
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon any untrue statement or alleged untrue statement of a
material fact contained in the registration statement for the registration of
the Securities as originally filed or in any amendment thereof, or in the Basic
Prospectus, any Preliminary Final Prospectus or the Final Prospectus, or in any
amendment thereof or supplement thereto, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
agrees to reimburse each such indemnified party, as incurred, for any legal or
other expenses reasonably incurred by them in connection with investigating or
defending any such loss, claim, damage, liability or action; provided, however,
                                                             --------  ------- 
that (i) the Company will not be liable in any such case to the extent that any
such loss, claim, damage or liability arises out of or is based upon any such
untrue statement or alleged untrue statement or omission or alleged omission
made therein in reliance upon and in conformity with written information
furnished to the Company by or on behalf of any Underwriter through the
Representatives specifically for inclusion therein, and (ii) such indemnity with
respect to any Preliminary Final Prospectus shall not inure to the benefit of
any Underwriter from whom the person asserting such loss, claim, damage or
liability purchased the Securities which are the subject thereof if such person
did not receive a copy of the Final Prospectus (or the Final Prospectus as
supplemented) at or prior to the confirmation of the sale of such Securities to
such

                                       13
<PAGE>
 
person (other than as a result of the Company's breach of its obligations under
Section 4) in any case where such delivery is required by the Act and the untrue
statement or omission of a material fact contained in such Preliminary Final
Prospectus was corrected in the Final Prospectus (or the Final Prospectus as
supplemented). This indemnity agreement will be in addition to any liability
which the Company may otherwise have.

          (b)  Each Underwriter severally agrees to indemnify and hold harmless
     the Company, each of its directors, each of its officers who signs the
     Registration Statement, and each person who controls the Company within the
     meaning of either the Act or the Exchange Act, to the same extent as the
     foregoing indemnity from the Company to each Underwriter, but only with
     reference to written information relating to such Underwriter furnished to
     the Company by or on behalf of such Underwriter through the Representatives
     specifically for inclusion in the documents referred to in the foregoing
     indemnity.  This indemnity agreement will be in addition to any liability
     which any Underwriter may otherwise have.  The Company acknowledges that
     the statements set forth in the last paragraph of the cover page,  under
     the heading "Underwriting" or "Plan of Distribution" in the Preliminary
     Final Prospectus or the Final Prospectus, constitute the only information
     furnished in writing by or on behalf of any of the Underwriters for
     inclusion in the documents referred to in the foregoing indemnity, and you,
     as the Representatives, confirm that such statements are correct.

          (c)  Promptly after receipt by an indemnified party under this Section
     7 of notice of the commencement of any action, such indemnified party will,
     if a claim in respect thereof is to be made against the indemnifying party
     under this Section 7, notify the indemnifying party in writing of the
     commencement thereof; but the failure so to notify the indemnifying party
     (i) will not relieve it from liability under paragraph (a) or (b) above
     unless and to the extent it did not otherwise learn of such action and such
     failure results in the material prejudice of substantial rights and
     defenses of the indemnifying party and (ii) will not, in any event, relieve
     the indemnifying party from any obligations to any indemnified party other
     than the indemnification obligation provided in paragraph (a) or (b) above.
     The indemnifying party shall be entitled to appoint counsel of the
     indemnifying party's choice at the indemnifying party's expense to
     represent the indemnified party in any action for which indemnification is
     sought (in which case the indemnifying party shall not thereafter be
     responsible for the fees and expenses of any separate counsel retained by
     the indemnified party or parties except as set forth below); provided,
                                                                  -------- 
     however, that such counsel shall be reasonably satisfactory to the
     -------                                                           
     indemnified party.  Notwithstanding the indemnifying party's election to
     appoint counsel to represent the indemnified party in an action, the
     indemnified party shall have the right to employ separate counsel
     (including local counsel), and the indemnifying party shall bear the
     reasonable fees, costs and expenses of such separate counsel if (i) the use
     of counsel chosen by the indemnifying party to represent the indemnified
     party would present such counsel with a conflict of interest, (ii) the
     actual or potential defendants in, or targets of, any such action include
     both the indemnified party and the indemnifying party and the indemnified
     party shall have reasonably concluded that there may be legal defenses
     available to it and/or other indemnified parties which are different from
     or additional to those available to the indemnifying party, (iii) the
     indemnifying party shall not have

                                       14
<PAGE>
 
     employed counsel reasonably satisfactory to the indemnified party to
     represent the indemnified party within a reasonable time after notice of
     the institution of such action or (iv) the indemnifying party shall
     authorize the indemnified party to employ separate counsel at the expense
     of the indemnifying party. An indemnifying party will not, without the
     prior written consent of the indemnified parties (which shall not be
     unreasonably withheld, delayed, or conditioned), settle or compromise or
     consent to the entry of any judgment with respect to any pending or
     threatened claim, action, suit or proceeding in respect of which
     indemnification or contribution may be sought hereunder (whether or not the
     indemnified parties are actual or potential parties to such claim or
     action) unless such settlement, compromise or consent includes an
     unconditional release of each indemnified party from all liability arising
     out of such claim, action, suit or proceeding and does not include any
     statement as to or admission of fault, culpability or failure to act by or
     on behalf of such indemnified party.

          (d)  In the event that the indemnity provided in paragraph (a) or (b)
     of this Section 7 is unavailable to or insufficient to hold harmless an
     indemnified party for any reason, the Company and the Underwriters agree to
     contribute to the aggregate losses, claims, damages and liabilities
     (including legal or other expenses reasonably incurred in connection with
     investigating or defending same) (collectively "Losses") to which the
     Company and one or more  of the Underwriters may be subject in such
     proportion as is appropriate to reflect the relative benefits received by
     the Company and by the Underwriters from the offering of the Securities;
     provided, however, that in no case shall any Underwriter (except as may be
     --------  -------                                                         
     provided in any agreement among underwriters relating to the offering of
     the Securities) be responsible for any amount in excess of the underwriting
     discount or commission applicable to the Securities purchased by such
     Underwriter hereunder.  If the allocation provided by the immediately
     preceding sentence is unavailable for any reason, the Company and the
     Underwriters shall contribute in such proportion as is appropriate to
     reflect not only such relative benefits but also the relative fault of the
     Company and of the Underwriters in connection with the statements or
     omissions which resulted in such Losses as well as any other relevant
     equitable considerations.  Benefits received by the Company shall be deemed
     to be equal to the total net proceeds from the offering (before deducting
     expenses), and benefits received by the Underwriters shall be deemed to be
     equal to the total underwriting discounts and commissions, in each case as
     set forth on the cover page of the Final Prospectus.   Relative fault shall
     be determined by reference to whether any alleged untrue statement or
     omission relates to information provided by the Company or the Underwriters
     and the parties' relative intent, knowledge, access to information and
     opportunity to correct or prevent such statement or omission.  The Company
     and the Underwriters agree that it would not be just and equitable if
     contribution were determined by pro rata allocation or any other method of
     allocation which does not take account of the equitable considerations
     referred to above.  Notwithstanding the provisions of this paragraph (d),
     no person guilty of fraudulent misrepresentation (within the meaning of
     Section 11(f) of the Act) shall be entitled to contribution from any person
     who was not guilty of such fraudulent misrepresentation.  For purposes of
     this Section 7, each person who controls an Underwriter within the meaning
     of either the Act or the Exchange Act and each

                                       15
<PAGE>
 
     director, officer, employee and agent of an Underwriter shall have the same
     rights to contribution as such Underwriter, and each person who controls
     the Company within the meaning of either the Act or the Exchange Act, each
     officer of the Company who shall have signed the Registration Statement and
     each director of the Company shall have the same rights to contribution as
     the Company, subject in each case to the applicable terms and conditions of
     this paragraph (d). The Underwriters' respective obligations to contribute
     pursuant to this Section 7 are several in proportion to their respective
     underwriting commitments and not joint.

          8.  Default by an Underwriter.  If any one or more Underwriters shall
              -------------------------                                        
fail to purchase and pay for any of the Securities agreed to be purchased by
such Underwriter or Underwriters hereunder and such failure to purchase shall
constitute a default in the performance of its or their obligations under this
Agreement, the remaining Underwriters shall be obligated severally to take up
and pay for (in the respective proportions which the amount of Securities set
forth opposite their names in Schedule II hereto bears to the aggregate amount
of Securities set forth opposite the names of all the remaining Underwriters)
the Securities which the defaulting Underwriter or Underwriters agreed but
failed to purchase; provided, however, that in the event that the aggregate
                    --------  -------                                      
amount of Securities which the defaulting Underwriter or Underwriters agreed but
failed to purchase shall exceed 10% of the aggregate amount of Securities set
forth in Schedule II hereto, the remaining Underwriters shall have the right to
purchase all, but shall not be under any obligation to purchase any, of the
Securities, and if such nondefaulting Underwriters do not purchase all the
Securities, this Agreement will terminate without liability to any nondefaulting
Underwriter or the Company.  In the event of a default by any Underwriter as set
forth in this Section 8, the Closing Date shall be postponed for such period,
not exceeding seven days, as the Representatives shall determine in order that
the required changes in the Registration Statement and the Final Prospectus or
in any other documents or arrangements may be effected.  Nothing contained in
this Agreement shall relieve any defaulting Underwriter of its liability, if
any, to the Company and any nondefaulting Underwriter for damages occasioned by
its default hereunder.

          9.  Termination.  This Agreement shall be subject to termination in
              -----------                                                    
the absolute discretion of the Representatives, by notice given to the Company
prior to delivery of and payment for the Securities, if prior to such time (i)
trading in the Company's common stock shall have been suspended by the
Commission or the New York Stock Exchange or trading in securities generally on
the New York Stock Exchange shall have been suspended or limited or minimum
prices shall have been established on such Exchange, (ii) a banking moratorium
shall have been declared either by Federal or New York State authorities or
(iii) there shall have occurred any outbreak or escalation of hostilities,
declaration by the United States of a national emergency or war or other
calamity or crisis the effect of which on financial markets is such as to make
it, in the judgment of the Representatives, impracticable or inadvisable to
proceed with the offering or delivery of the securities as contemplated by the
Final Prospectus (exclusive of any supplement thereto).

          10.  Representations and Indemnities to Survive.  The respective
               ------------------------------------------                 
agreements, representations, warranties, indemnities and other statements of the
Company or its officers and of the Underwriters set forth in or made pursuant to
this Agreement will remain in full force and

                                       16
<PAGE>
 
effect, regardless of any investigation made by or on behalf of any Underwriter
or the Company or any of the officers, directors or controlling persons referred
to in Section 7 hereof, and will survive delivery of and payment for the
Securities. The provisions of Sections 6 and 7 hereof shall survive the
termination or cancellation of this Agreement.

          11.  Notices.  All communications hereunder will be in writing and
               -------                                                      
effective only on receipt, and, if sent to the Representatives, will be mailed,
delivered or telecopied and confirmed to them, at the address specified in
Schedule I hereto; or, if sent to the Company, will be mailed, delivered or
telecopied and confirmed to it at 180 South Clinton Avenue, Rochester, New York,
14646-0700, attention - Corporate Vice President - Legal Services.

          12.  Successors.  This Agreement will inure to the benefit of and be
               ----------                                                     
binding upon the parties hereto and their respective successors and the officers
and directors and controlling persons referred to in Section 7 hereof, and no
other person will have any right or obligation hereunder.

                                       17
<PAGE>
 
          13.  Applicable Law.  This Agreement will be governed by and construed
               --------------                                                   
in accordance with the laws of the State of New York.

          If the foregoing is in accordance with your understanding of our
agreement, please sign and return to us the enclosed duplicate hereof, whereupon
this letter and your acceptance shall represent a binding agreement among the
Company and the several Underwriters.



                                         Very truly yours,

                                         Frontier Corporation

                                         By: /s/ Louis L. Massaro
                                            ----------------------------
                                             Executive Vice President,
                                             Chief Administrative Officer
                                             and Chief Financial Officer

The foregoing Agreement is
hereby confirmed and accepted
as of the date specified in
Schedule I hereto.

Salomon Brothers Inc
Lehman Brothers Inc.

By:  Salomon Brothers Inc

By: /s/ Lourdes Perez-Berkeley
   ----------------------------
          Vice President

For themselves and the other
several Underwriters, if any,
named in Schedule II to the
foregoing Agreement.

 

                                       18
<PAGE>
 
                                  SCHEDULE I


Underwriting Agreement dated May 21, 1997

Registration Statement No. 33-64307

Representatives:  Salomon Brothers Inc
                  Seven World Trade Center
                  New York, NY
                  Telecopy: (212) 783-6972
                  Attn:  Legal Department

                  Lehman Brothers Inc.
                  3 World Financial Center
                  200 Vesey Street
                  New York, NY  10285
                  Attn: Legal Department

Title, Purchase Price and Description of Securities:

    Title: 7.25% Notes due 2004

    Principal amount:  $300,000,000

    Purchase price (include accrued interest or amortization, if any):
    $298,023,000, representing 99.966% of the principal amount being purchased,
    less an underwriting discount of 0.625% of the principal amount being
    ----                                                                 
    purchased.

    Sinking fund provisions:  The Securities will not be subject to any sinking
    fund.

    Redemption provisions: The Securities will be redeemable as a whole or in
    part, at the option of the Company at any time, and from time to time, on
    not less than 30 or more than 60 days' notice mailed to registered Holders
    thereof, at a redemption price equal to the greater of (i) 100% of the
    principal amount of the Notes to be redeemed and (ii) the sum of the present
    values of the Remaining Scheduled Payments (as defined in the Final
    Prospectus) thereon discounted to the redemption date on a semiannual basis
    (assuming a 360-day year consisting of twelve 30-day months) at the Treasury
    Rate (as defined in the Final Prospectus) plus 10 basis points, together in
    either case with accrued interest on the principal amount being redeemed to
    the date of redemption.


Closing Date, Time and Location:  May 27, 1997, 10:00 AM, New York City time, at
the offices of Cleary, Gottlieb, Steen & Hamilton, One Liberty Plaza, New York,
New York 10006.

                                       19
<PAGE>
 
Type of Offering:  Delayed Offering

Date referred to in Section 4(e) after which the Company may offer or sell debt
securities issued or guaranteed by the Company, other than the Securities and up
to $100 million aggregate principal amount of "putable" bonds offered pursuant
to Rule 144A and Regulation S of the Act, without the consent of the
Representatives: the first business day occurring on or after the tenth business
day after the Closing Date.

                                       20
<PAGE>
 
                                  SCHEDULE II
<TABLE>
<CAPTION>
                                     Principal Amount
                                     of Securities to
Underwriters                           be Purchased
- ------------                         ----------------
<S>                                  <C>
 
Salomon Brothers Inc                     $107,500,000
Lehman Brothers Inc.                      107,500,000
Morgan Stanley & Co. Incorporated          50,000,000
Chase Securities Inc.                      35,000,000
                                         ------------
     Total.........................      $300,000,000
 
</TABLE>

                                       21

<PAGE>

                                                                     Exhibit 4.1

 
                        FRONTIER CORPORATION, AS OBLIGOR


                                      And


                            THE CHASE MANHATTAN BANK

                                   As Trustee

                            ------------------------

                                   INDENTURE


                           Dated as of May 21, 1997

        -----------------------------------------------------------

                             SENIOR DEBT SECURITIES

       ------------------------------------------------------------
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                            Page
                                                                            ----

RECITALS OF THE COMPANY....................................................... 2
ARTICLE I  DEFINITIONS AND OTHER PROVISIONS OF GENERAL
   APPLICATION................................................................ 2
   Section 101  Definitions................................................... 2
   Act........................................................................ 2
   Additional Amounts......................................................... 2
   Affiliate.................................................................. 2
   Authenticating Agent....................................................... 2
   Authorized Newspaper....................................................... 2
   Bankruptcy Law............................................................. 2
   Bearer Security............................................................ 2
   Board of Directors......................................................... 2
   Board Resolution........................................................... 2
   Business Day............................................................... 2
   CEDEL...................................................................... 2
   Commission................................................................. 2
   Company.................................................................... 3
   Company Request" and "Company Order........................................ 3
   Consolidated Income Available for Debt Service............................. 3
   Consolidated Net Income.................................................... 3
   Conversion Event........................................................... 3
   Corporate Trust Office..................................................... 3
   Corporation................................................................ 3
   Coupon..................................................................... 3
   Custodian.................................................................. 3
   Debt....................................................................... 3
   Defaulted Interest......................................................... 4
   Depositary................................................................. 4
   Dollar..................................................................... 4
   ECU........................................................................ 4
   Euroclear.................................................................. 4
   European Communities....................................................... 4
   European Monetary System................................................... 4
   Event of Default........................................................... 4
   Exchange Act............................................................... 4
   Foreign Currency........................................................... 4
   GAAP....................................................................... 4
   Government Obligations..................................................... 4
   Holder..................................................................... 5
   Indenture.................................................................. 5
   Indexed Security........................................................... 5
   Interest................................................................... 5
   Interest Payment Date...................................................... 5
   Make-Whole Amount.......................................................... 5
   Maturity................................................................... 5
   Maximum Annual Service Charge.............................................. 5

                                       i
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                            Page
                                                                            ----

   Officers' Certificate...................................................... 5
   Opinion of Counsel......................................................... 6
   Original Issue Discount Security........................................... 6
   Outstanding................................................................ 6
   Paying Agent............................................................... 7
   Person..................................................................... 7
   Place of Payment........................................................... 7
   Predecessor Security....................................................... 7
   Redemption Date............................................................ 7
   Redemption Price........................................................... 7
   Registered Security........................................................ 7
   Regular Record Date........................................................ 7
   Reinvestment Rate.......................................................... 7
   Repayment Date............................................................. 8
   Repayment Price............................................................ 8
   Responsible Officer........................................................ 8
   Securities Act............................................................. 8
   Security................................................................... 8
   Security Register" and "Security Registrar................................. 8
   Significant Subsidiary..................................................... 8
   Special Record Date........................................................ 8
   Stated Maturity............................................................ 8
   Statistical Release........................................................ 8
   Subsidiary................................................................. 9
   Total Assets............................................................... 9
   Trust Indenture Act" or "TIA............................................... 9
   Trustee.................................................................... 9
   United States.............................................................. 9
   United States Person....................................................... 9
   Yield to Maturity.......................................................... 9
   Section 102  Compliance Certificates and Opinions.......................... 9
   Section 103  Form of Documents Delivered to Trustee....................... 10
   Section 104  Acts of Holders.............................................. 10
   Section 105  Notices, etc. to Trustee and Company......................... 12
   Section 106  Notice to Holders; Waiver.................................... 12
   Section 107  Effect of Headings and Table of Contents..................... 13
   Section 108  Successors and Assigns....................................... 13
   Section 109  Separability Clause.......................................... 13
   Section 110  Benefits of Indenture........................................ 13
   Section 111  No Personal Liability........................................ 13
   Section 112  Governing Law................................................ 13
   Section 113  Legal Holidays............................................... 13
ARTICLE II  SECURITIES FORMS................................................. 14
   Section 201  Forms of Securities.......................................... 14
   Section 202  Form of Trustee's Certificate of Authentication.............. 14
   Section 203  Securities Issuable in Global Form........................... 14
ARTICLE III  THE SECURITIES.................................................. 15
   Section 301  Amount Unlimited: Issuable in Series......................... 15

                                       ii
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                            Page
                                                                            ----

   Section 302  Denominations................................................ 18
   Section 303  Execution, Authentication, Delivery and Dating............... 18
   Section 304  Temporary Securities......................................... 20
   Section 305  Registration, Registration of Transfer and Exchange.......... 22
   Section 306  Mutilated, Destroyed, Lost and Stolen Securities............. 25
   Section 307  Payment of Interest; Interest Rights Preserved............... 26
   Section 308  Persons Deemed Owners........................................ 28
   Section 309  Cancellation................................................. 29
   Section 310  Computation of Interest...................................... 29
ARTICLE IV  SATISFACTION AND DISCHARGE....................................... 30
   Section 401  Satisfaction and Discharge of Indenture...................... 30
   Section 402  Application of Trust Funds................................... 31
ARTICLE V  REMEDIES.......................................................... 32
   Section 501  Events of Default............................................ 32
   Section 502  Acceleration of Maturity; Rescission and Annulment........... 33
   Section 503  Collection of Indebtedness and Suits for Enforcement
                by Trustee................................................... 34
   Section 504  Trustee May File Proofs of Claim............................. 35
   Section 505  Trustee May Enforce Claims Without Possession of Securities
                or Coupons................................................... 36
   Section 506  Application of Money Collected............................... 36
   Section 507  Limitation on Suits.......................................... 36
   Section 508  Unconditional Right of Holders to Receive Principal, Premium
                or Make-Whole Amount, if any, Interest and Additional
                Amounts...................................................... 37
   Section 509  Restoration of Rights and Remedies........................... 37
   Section 510  Rights and Remedies Cumulative............................... 37
   Section 511  Delay or Omission Not Waiver................................. 37
   Section 512  Control by Holders of Securities............................. 37
   Section 513  Waiver of Past Defaults...................................... 38
   Section 514  Waiver of Usury, Stay or Extension Laws...................... 38
   Section 515  Undertaking for Costs........................................ 38
ARTICLE VI  THE TRUSTEE...................................................... 39
   Section 601  Notice of Defaults........................................... 40
   Section 602  Certain Rights of Trustee.................................... 40
   Section 603  Not Responsible for Recitals or Issuance of Securities....... 41
   Section 604  May Hold Securities.......................................... 41
   Section 605  Money Held in Trust.......................................... 41
   Section 606  Compensation and Reimbursement............................... 42
   Section 607  Corporate Trustee Required; Eligibility; Conflicting
                Interests.................................................... 42
   Section 608  Resignation and Removal; Appointment of Successor............ 43
   Section 609  Acceptance of Appointment by Successor....................... 44
   Section 610  Merger, Conversion, Consolidation or Succession to Business.. 45
   Section 611  Appointment of Authenticating Agent.......................... 45
ARTICLE VII  HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY................ 46
   Section 702  Reports by Trustee........................................... 47
   Section 703  Reports by Company........................................... 48

                                      iii
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                            Page
                                                                            ----

   Section 704  The Company to Furnish Trustee Names and Addresses
                of Holders................................................... 48
ARTICLE VIII  CONSOLIDATION, MERGER, SALE, LEASE OR CONVEYANCE............... 49
   Section 801  Consolidation and Mergers of Company and Sales, Leases
                and Conveyances Permitted Subject to Certain Conditions...... 49
   Section 802  Rights and Duties of Successor Entity........................ 49
   Section 803  Officers' Certificate and Opinion of Counsel................. 49
ARTICLE IX  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 or Supplemental Indentures............................ 52
   Section 905  Conformity with Trust Indenture Act.......................... 52
   Section 906  Reference in Securities to Supplemental Indentures........... 52
   Section 907  Notice of Supplemental Indentures............................ 52
ARTICLE X  COVENANTS......................................................... 52
   Section 1001  Payment of Principal, Premium or Make-Whole Amount, if any,
                 Interest and Additional Amounts............................. 52
   Section 1002  Maintenance of Office or Agency............................. 53
   Section 1003  Money for Securities Payments to Be Held in Trust........... 54
   Section 1004  [Omitted]................................................... 55
   Section 1005  [Omitted]................................................... 55
   Section 1006  Existence................................................... 55
   Section 1007  Maintenance of Properties................................... 56
   Section 1008  Insurance................................................... 56
   Section 1009  Payment of Taxes and Other Claims........................... 56
   Section 1010  Provision of Financial Information.......................... 56
   Section 1011  Statement as to Compliance.................................. 56
   Section 1012  Additional Amounts.......................................... 57
   Section 1013  Waiver of Certain Covenants................................. 57
ARTICLE XI  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........... 58
   Section 1104  Notice of Redemption........................................ 58
   Section 1105  Deposit of Redemption Price................................. 59
   Section 1106  Securities Payable on Redemption Date....................... 60
   Section 1107  Securities Redeemed in Part................................. 60
ARTICLE XII  INTENTIONALLY OMITTED........................................... 61
ARTICLE XIII  REPAYMENT AT THE OPTION OF HOLDERS............................. 61
   Section 1301  Applicability of Article.................................... 61
   Section 1302  Repayment of Securities..................................... 61
   Section 1303  Exercise of Option.......................................... 61
   Section 1304  When Securities Presented for Repayment Become Due
                 and Payable................................................. 62

                                       iv
<PAGE>
 
                               TABLE OF CONTENTS
                               -----------------
                                                                            Page
                                                                            ----

   Section 1305  Securities Repaid in Part................................... 63
ARTICLE XIV  DEFEASANCE AND COVENANT DEFEASANCE.............................. 63
   Section 1401  Applicability of Article; Company's Option to Effect
                 Defeasance or Covenant Defeasance........................... 63
   Section 1402  Defeasance and Discharge.................................... 63
   Section 1403  Covenant Defeasance......................................... 63
   Section 1404  Conditions to Defeasance or Covenant Defeasance............. 64
   Section 1405  Deposited Money and Government Obligations to Be Held
                 in Trust; Other Miscellaneous Provisions.................... 65
ARTICLE XV  MEETINGS OF HOLDERS OF SECURITIES................................ 66
   Section 1501  Purposes for Which Meetings May Be Called................... 66
   Section 1502  Call, Notice and Place of Meetings.......................... 66
   Section 1503  Persons Entitled to Vote at Meetings........................ 67
   Section 1504  Quorum; Action.............................................. 67
   Section 1505  Determination of Voting Rights; Conduct and Adjournment
                 of Meetings................................................. 68
   Section 1506  Counting Votes and Recording Action of Meetings............. 68
   Section 1507  Evidence of Action Taken by Holders......................... 69
   Section 1508  Proof of Execution of Instruments........................... 69

                                       v
<PAGE>
 
                       Frontier Corporation, as Obligor

  Reconciliation and tie between Trust Indenture Act of 1939 (the "1939 Act")
and this Indenture, dated as of  May 21, 1997.

Trust Indenture Act Section                       Indenture Section

(S)310    (a)(1)................................................609
          (a)(2)................................................609
          (b)..............................................609,.610
(S)312    (c)...................................................701
(S)313    (a)...................................................702
          (c)...................................................702
(S)314    (a)...................................................703
          (a)(4)...............................................1011
          (c)(1)................................................102
          (c)(2)................................................102
          (e)...................................................102
(S)315    (b)...................................................603
(S)316    (a)(last sentence)....................101 ("Outstanding")
          (a)(1)(A)........................................502,.512
          (a)(1)(B).............................................513
          (b)...................................................508
(S)317    (a)(1)................................................503
          (a)(2)................................................504
(S)318    (a)...................................................111
          (c)...................................................111
 

NOTE:  This reconciliation and tie shall not, for any purpose, be deemed to be a
part of this Indenture.

  Attention should also be directed to Section 318(c) of the 1939 Act, which
provides that the provisions of Sections 310 to and including 317 of the 1939
Act are a part of and govern every qualified indenture, whether or not
physically contained therein.

                                       vi
<PAGE>
 
  Indenture (this "Indenture"), dated as of  May 21, 1997, by and
between FRONTIER CORPORATION, a New York business corporation (the "Company")
having its principal office at 180 South Clinton Avenue, Rochester, New York
14646-0700, and THE CHASE MANHATTAN BANK, a New York banking corporation, as
Trustee hereunder (the "Trustee"), having its Corporate Trust Office (as defined
below) at 450 West 33/rd/ Street, New York, New York  10001.


                            RECITALS OF THE COMPANY

  The Company deems it necessary to issue from time to time for its lawful
purposes senior debt securities (the "Securities") evidencing its unsecured
indebtedness, and has duly authorized the execution and delivery of this
Indenture to provide for the issuance from time to time of the Securities,
unlimited as to aggregate principal amount, to bear interest at the rates or
formulas, to mature at such times and to have such other provisions as shall be
fixed therefor as hereinafter provided.

  This Indenture is subject to the provisions of the Trust Indenture Act of
1939, as amended, that are deemed to be incorporated into this Indenture and
shall, to the extent applicable, be governed by such provisions.

  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, as follows:


                                   ARTICLE I

            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 TIA, either directly
or by reference therein, have the meanings assigned to them therein, and the
terms "cash transaction" and "self-liquidating paper", as used in TIA Section
311, shall have the meanings assigned to them in the rules of the Commission
adopted under the TIA;

  (3) all accounting terms not otherwise defined herein have the meanings
assigned to them in accordance with GAAP; and

  (4) 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 subdivision.
<PAGE>
 
  Certain terms, used principally in Article III, Article V, Article VI
and Article X, are defined in those Articles. In addition, the following terms
shall have the indicated respective meanings:

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


  "Additional Amounts" means any additional amounts which are required by a
   ------------------                                                      
Security or by or pursuant to a Board Resolution, under circumstances specified
therein, to be paid by the Company in respect of certain taxes imposed on
certain Holders and which are owing to such Holders.

  "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 authenticating agent appointed by the Trustee
   --------------------                                                         
pursuant to Section 613.

  "Authorized Newspaper" means a newspaper, printed in the English language or
   --------------------
in an official language of the country of publication, customarily published on
each Business Day, whether or not published on Saturdays, Sundays or holidays,
and of general circulation in each place in connection with which the term is
used or in the financial community of each such place.  Whenever successive
publications are required to be made in Authorized Newspapers, the successive
publications may be made in the same or in different Authorized Newspapers in
the same city meeting the foregoing requirements and in each case on any
Business Day.

  "Bankruptcy Law" has the meaning specified in Section 501.
   --------------                                           

  "Bearer Security" means any Security established pursuant to Section 201 which
   ---------------                                                              
is payable to bearer.

  "Board of Directors" means the board of directors of the Company, the
   ------------------
executive committee or any committee of that board duly authorized to act
hereunder, as the case may be.

  "Board Resolution" means a copy of a resolution of the Company, 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 or any other
   ------------                                                              
particular location referred to in this Indenture or in the Securities, means,
unless otherwise specified with respect to any Securities pursuant to Section
301, any day, other than a Saturday or Sunday, that is neither a legal holiday
nor a day on which banking institutions in that Place of Payment or particular
location are authorized or required by law, regulation or executive order to
close.

  "CEDEL" means Centrale de Livraison de Valeurs Mobilieres, S.A., or its
   -----                                                                 
successor.

  "Commission" means the Securities and Exchange Commission, as from time to
   ----------
time constituted, created under the Exchange Act, or, if at any time after
execution of this instrument

                                       2
<PAGE>
 
such Commission is not existing and performing the duties now assigned to it
under the Trust Indenture Act, then the body performing such duties on such
date.

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

  "Company Request" and "Company Order" mean, respectively, a written request or
   ---------------       -------------                                          
order signed in the name of and on behalf of the Company by (i) its Chairman of
the Board, the President or a Vice President, and (ii) its Treasurer, an
Assistant Treasurer, Secretary, or an Assistant Secretary, and delivered to the
Trustee.

  "Consolidated Income Available for Debt Service" for any period means
   ----------------------------------------------                      
Consolidated Net Income of the Company and its Subsidiaries adjusted (i) to
eliminate gains and losses on property dispositions, refinancings and other
capital transactions, (ii) to reflect payment of deferred charges on a cash
rather than accrual basis, and (iii) to add back all amounts which have been
deducted for (a) interest on Debt of the Company and its Subsidiaries, (b)
provision for taxes of the Company and its Subsidiaries based on income, (c)
amortization of debt discount, (d) depreciation and amortization, and (e) any
noncash charge resulting from a change in accounting principles in determining
Consolidated Net Income for such period.

  "Consolidated Net Income" for any period means the amount of consolidated net
   -----------------------                                                     
income (or loss) of the Company and its Subsidiaries for such period determined
on a consolidated basis in accordance with GAAP.

  "Conversion Event" means the cessation of use of (i) a Foreign Currency both
   ----------------
by the government of the country which issued such currency and for the
settlement of transactions by a central bank or other public institutions of or
within the international banking community, (ii) the ECU both within the
European Monetary System and for the settlement of transactions by public
institutions of or within the European Communities or (iii) any currency unit
(or composite currency) other than the ECU for the purposes for which it was
established.

  "Corporate Trust Office" means the principal corporate trust office of the
   ----------------------                                                   
Trustee at which, at any particular time, its corporate trust business shall be
administered, which office at the date hereof is located at 450 West 33/rd/
Street, New York, New York 10001.

  "Corporation" includes corporations, associations, and companies.
   -----------                                                     

  "Coupon" means any interest coupon appertaining to a Bearer Security.
   ------                                                              

  "Custodian" has the meaning specified in Section 501.
   ---------                                           

  "Debt" of the Company or any Subsidiary means any indebtedness of the
   ----         
Company or any Subsidiary, whether or not contingent, in respect of (i) borrowed
money or evidenced by bonds, notes, debentures or similar instruments, (ii)
indebtedness secured by any mortgage, pledge, lien, charge, encumbrance or any
security interest existing on property owned by the Company or any Subsidiary,
(iii) letters of credit, (iv) amounts representing the balance deferred and
unpaid of the purchase price of any property except any such balance that
constitutes an accrued expense or trade payable or (v) any lease of property by
the Company or any Subsidiary as lessee which is reflected on the Company's
Consolidated Balance Sheet as a capitalized lease in accordance with GAAP, in
the case of items of indebtedness under (i) through (iv) above to the extent
that any such items (other than letters of credit) would appear as a liability
on the Company's consolidated balance sheet in accordance with GAAP, and also
includes, to the extent not otherwise included,

                                       3
<PAGE>
 
any obligation by the Company or any Subsidiary to be liable for, or to pay, as
obligor, guarantor or otherwise (other than for purposes of collection in the
ordinary course of business), indebtedness of another person (other than the
Company or any Subsidiary).

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

  "DTC" means The Depository Trust Company for so long as it shall be a clearing
   ---                                                                          
agency registered under the Exchange Act, or such successor as the Company shall
designate from time to time in an Officers' Certificate delivered to the
Trustee.

  "Dollar" or "$" means a dollar or other equivalent unit in such coin or
   ------      -
currency of the United States of America as at the time shall be legal tender
for the payment of public and private debts.

  "ECU" means the European Currency Unit as defined and revised from time to
   ---
time by the Counsel of the European Communities.

  "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels Office,
   ---------
or its successor as operator of the Euroclear System.

  "European Communities" means the European Economic Community, the European
   --------------------                                                     
Coal and Steel Community and the European Atomic Energy Community.

  "European Monetary System" means the European Monetary System established by
   ------------------------
the Resolution of December 5, 1978 of the Council of the European Communities.

  "Event of Default" has the meaning specified in Article V.
   ----------------                                         

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

  "Foreign Currency" means any currency, currency unit or composite currency,
   ----------------                                                          
including, without limitation, the ECU, issued by the government of one or more
countries other than the United States of America or by any recognized
confederation or association of such governments.

  "GAAP" means generally accepted accounting principles, as in effect from time
   ----
to time, as used in the United States applied on a consistent basis; provided,
that solely for purposes of any calculation required by the financial covenants
contained herein, "GAAP" shall mean generally accepted accounting principles as
used in the United States on the date hereof, applied on a consistent basis.

  "Government Obligations" means securities which are (i) direct obligations of
   ----------------------                                                      
the United States of America or the government which issued the Foreign Currency
in which the Securities of a particular series are payable, for the payment of
which its full faith and credit is pledged or (ii) obligations of a Person
controlled or supervised by and acting as an agency or instrumentality of the
United States of America or such government which issued the foreign currency in
which the Securities of such series are payable, the payment of which is
unconditionally guaranteed as a full faith and credit obligation by the United
States of America or such other government, which, in either case, are not
callable or redeemable at the option of the issuer thereof, and shall also
include a depository receipt issued by a bank or trust company as custodian with
respect to any such Government Obligation or a specific payment of interest on
or principal of any such

                                       4
<PAGE>
 
Government Obligation held by such custodian for the account of the holder of a
depository receipt, 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 depository receipt from any amount received by the custodian in respect of
the Government Obligation or the specific payment of interest on or principal of
the Government Obligation evidenced by such depository receipt.

  "Holder" means, in the case of a Registered Security, the Person in whose
   ------
name a Security is registered in the Security Register and, in the case of a
Bearer Security, the bearer thereof and, when used with respect to any coupon,
shall mean the bearer thereof.

  "Indenture" means 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 established as contemplated
by Section 301; provided, however, that, if at any time more than one Person is
                --------  -------
acting as Trustee under this instrument, "Indenture" shall mean, with respect to
                                          --------- 
any one or more series of Securities for which 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 the
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
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.

  "Indexed Security" means a Security the terms of which provide that the
   ----------------                                                      
principal amount thereof payable at Stated Maturity may be more or less than the
principal face amount thereof at original issuance.

  "Interest" when used with respect to an Original Issue Discount Security which
   --------                                                                     
by its terms bears interest only after Maturity, shall mean interest payable
after Maturity, and, when used with respect to a Security which provides for the
payment of Additional Amounts pursuant to Section 1012, includes such Additional
Amounts.

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

  "Make-Whole Amount" means the amount, if any, in addition to principal which
   -----------------  
is required by a Security, under the terms and conditions specified therein or
as otherwise specified as contemplated by Section 301 to be paid by the Company
to the Holder thereof in connection with any optional redemption or accelerated
payment of such Security.

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

  "Maximum Annual Service Charge" for any period means the amount payable
   -----------------------------                                         
(including, if determined on a pro forma basis, the maximum amount which may
become payable) in any 12-month period for interest on Debt.

  "Officers' Certificate" means a certificate complying with Section 102 signed
   ---------------------
by the Chairman of the Board of Directors, the President or a Vice-President and
by the Treasurer, an

                                       5
<PAGE>
 
Assistant Treasurer, the Secretary or an Assistant Secretary, of the Company,
and delivered to the Trustee.

  "Opinion of Counsel" means a written opinion of counsel complying with Section
   ------------------                                                           
102, who may be counsel for the Company or who may be an employee of or other
counsel for the Company and who shall be reasonably satisfactory 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:
           ------ 

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

       (ii)    Securities, or portions thereof, for whose payment or redemption
or repayment at the option of the Holder 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
and any coupons appertaining thereto, 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;

       (iii)   Securities, except to the extent provided in Sections 1402 and
1403, with respect to which the Company has effected defeasance and/or covenant
defeasance as provided in Article XIV; and

       (iv)    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 any request, demand,
authorization, direction, notice, consent or waiver hereunder or are present at
a meeting of Holders for quorum purposes, and for the purpose of making the
calculations required by TIA Section 313, (i) the principal amount of an
Original Issue Discount Security that may be counted in making such
determination or calculation and that shall be deemed to be Outstanding for such
purpose shall be equal to the amount of principal thereof that would be (or
shall have been declared to be) due and payable, at the time of such
determination, upon a declaration of acceleration of the maturity thereof
pursuant to Section 502, (ii) the principal amount of any Security denominated
in a Foreign Currency that may be counted in making such determination or
calculation and that shall be deemed Outstanding for such purpose shall be equal
to the Dollar equivalent, determined pursuant to Section 301 as of the date such
Security is originally issued by the Company, of the principal amount (or, in
the case of an Original Issue Discount Security, the Dollar equivalent as of
such date of original issuance of the amount determined as provided in clause
(i) above) of such Security, (iii) the principal amount of any Indexed Security
that may be counted in making such determination or calculation and that shall
be deemed outstanding for such purpose shall be equal to the principal face
amount of such Indexed Security at original issuance, unless otherwise provided
with respect to such Security pursuant to Section 301, and (iv) Securities owned
by the

                                       6
<PAGE>
 
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 making
such calculation or in relying upon any such request, demand, authorization,
direction, notice, consent or waiver, 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 (and premium or Make-Whole Amount, if any) or interest on any Securities or
coupons on behalf of the Company.

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

  "Place of Payment", when used with respect to the Securities of or within any
   ----------------                                                            
series, means the place or places where the principal of (and premium or Make-
Whole Amount, if any) and interest on such Securities are payable as specified
as contemplated by Sections 301 and 1002.

  "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 or a Security to which a
mutilated, destroyed, lost or stolen coupon appertains shall be deemed to
evidence the same debt as the mutilated, destroyed, lost or stolen Security or
the Security to which the mutilated, destroyed, lost or stolen coupon
appertains.

  "Redemption Date", when used with respect to any Security to be redeemed, in
   ---------------                                                            
whole or in part, 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.

  "Registered Security" shall mean any Security which is registered in the
   -------------------                                                    
Security Register.

  "Regular Record Date" for the interest payable on any Interest Payment Date on
   -------------------                                                          
the Registered Securities of or within any series means the date specified for
that purpose as contemplated by Section 301, whether or not a Business Day.

  "Reinvestment Rate" means 0.25% (one-fourth of one percent) plus the yield
   -----------------
under the heading "Week Ending" published in the most recent Statistical Release
under the caption "Treasury Constant Maturities" for the maturity (rounded to
the nearest month) corresponding to the remaining life to maturity, as of the
payment date, of the principal being redeemed or paid. If no maturity exactly
corresponds to such maturity, yields for the two published maturities most
closely corresponding to such maturity shall be calculated pursuant to the
immediately preceding sentence and the Reinvestment Rate shall be interpolated
or extrapolated from such yields on a straight-line basis, rounding in each of
such relevant periods to the nearest month. For the

                                       7
<PAGE>
 
purposes of calculating the Reinvestment Rate, the most recent Statistical
Release published prior to the date of determination of the premium shall be
used.

  "Repayment Date" means, when used with respect to any Security to be repaid at
   --------------                                                               
the option of the Holder, the date fixed for such repayment by or pursuant to
this Indenture.

  "Repayment Price" means, when used with respect to any Security to be repaid
   ---------------
at the option of the Holder, the price at which it is to be repaid by or
pursuant to this Indenture.

  "Responsible Officer", when used with respect to the Trustee, means the
   -------------------
chairman or vice-chairman of the board of directors, the chairman or vice-
chairman of the executive committee of the board of directors, the president,
any vice president (whether or not designated by a number or a word or words
added before or after the title "vice president"), the secretary, any assistant
secretary, the treasurer, any assistant treasurer, the cashier, any assistant
cashier, any senior trust officer, any trust officer or assistant trust officer,
the controller or any other officer of the Trustee customarily performing
functions similar to those performed by any of the above designated officers and
also means, with respect to a particular corporate trust matter, any other
officer to whom such matter is referred because of such officer's knowledge and
familiarity with the particular subject.

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

  "Security" has the meaning stated in the first recital of this Indenture and,
   --------                                                                    
more particularly, means any Security or Securities authenticated and delivered
under this Indenture; provided, however, that, if at any time there is more than
                      --------  -------                                         
one Person acting as Trustee under this Indenture, "Securities" with respect to
the Indenture as to which such Person is Trustee shall have the meaning stated
in the first recital of this Indenture and shall more particularly mean
Securities authenticated and delivered under this Indenture, exclusive, however,
of Securities of any series as to which such Person is not Trustee.

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

  "Significant Subsidiary" means any Subsidiary which is a "significant
   ----------------------                                              
subsidiary" (as defined in Article I, Rule 1-02 of Regulation S-X, promulgated
under the Securities Act) of the Company.

  "Special Record Date" for the payment of any Defaulted Interest on the
   -------------------                                                  
Registered Securities of or within any series 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
or a coupon representing such installment of interest as the fixed date on which
the principal of such Security or such installment of principal or interest is
due and payable.

  "Statistical Release" means the statistical release designated "H.15(519)" or
   -------------------                                                         
any successor publication which is published weekly by the Federal Reserve
System and which establishes yields on actively traded United States government
securities adjusted to constant maturities, or, if such statistical release is
not published at the time of any determination under the Indenture, then such
other reasonably comparable index which shall be designated by the Company.

                                       8
<PAGE>
 
  "Subsidiary" means a corporation or a partnership a majority of the
   ----------
outstanding voting stock or partnership interests, as the case may be, of which
is owned, directly or indirectly, by the Company or by one or more other
Subsidiaries of the Company. For the purposes of this definition, "voting stock"
means stock having 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.

  "Total Assets" as of any date means the assets of the Company and its
   ------------                                                        
Subsidiaries on a consolidated basis determined in accordance with GAAP (but
excluding intangibles and accounts receivable).

  "Trust Indenture Act" or "TIA" means the Trust Indenture Act of 1939, as
   -------------------      ---                                           
amended and as in force at the date as of which this Indenture was executed,
except as provided in Section 905.

  "Trustee" means the Person named as the "Trustee" in the first paragraph of
   -------
this Indenture 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; provided, however, that if
                                                     --------  -------         
at any time there is more than one such Person, "Trustee" as used with respect
to the Securities of any series shall mean only the Trustee with respect to
Securities of that series.

  "United States" means, unless otherwise specified with respect to any
   -------------
Securities pursuant to Section 301, the United States of America (including the
states and the District of Columbia), its territories, its possessions and other
areas subject to its jurisdiction.

  "United States Person" means, unless otherwise specified with respect to any
   --------------------                                                       
Securities pursuant to Section 301, an individual who is a citizen or resident
of the United States, a corporation, Company or other entity created or
organized in or under the laws of the United States or an estate or trust the
income of which is subject to United States federal income taxation regardless
of its source.

  "Yield to Maturity" means the yield to maturity, computed at the time of
   -----------------                                                      
issuance of a Security (or, if applicable, at the most recent redetermination of
interest on such Security) and as set forth in such Security in accordance with
generally accepted United States bond yield computation principles.

  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 an Officers'
Certificate stating that all conditions precedent, if any, provided for in this
Indenture relating to the proposed action have been complied with and an Opinion
of Counsel stating that in the opinion of such counsel all such conditions
precedent, if any, have been complied with, except that in the case of any such
application or request as to which the furnishing of such documents is
specifically required by any provision of this Indenture relating to such
particular application or request, no additional certificate or opinion need be
furnished.

  Every certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture (including certificates delivered
pursuant to Section 1011) shall include:

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

                                       9
<PAGE>
 
  (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 condition or covenant 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 as 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 an Opinion of Counsel, or a certificate or
representations by counsel, unless such officer knows, or in the exercise of
reasonable care should know, that the opinion, certificate or representations
with respect to the matters upon which his certificate or opinion is based are
erroneous. Any such Opinion of Counsel or certificate or representations 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 as 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 as 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.
               --------------- 

  (a) Any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders of the Outstanding Securities of all series or one or more series, as
the case may be, may be embodied in and evidenced by one or more instruments of
substantially similar tenor signed by such Holders in person or by agents duly
appointed in writing. If Securities of a series are issuable as Bearer
Securities, any request, demand, authorization, direction, notice, consent,
waiver or other action provided by this Indenture to be given or taken by
Holders of Securities of such series may, alternatively, be embodied in and
evidenced by the record of Holders of Securities of such series voting in favor
thereof, either in person or by proxies duly appointed in writing, at any
meeting of Holders of Securities of such series duly called and held in
accordance with the provisions of Article XIV, or a combination of such
instruments and any such record. Except as herein otherwise expressly provided,
such action shall become effective when such instrument or instruments or record
or both are delivered to the Trustee and, where it is hereby expressly required,
to the Company. Such instrument or instruments and any such record (and the
action embodied therein and evidenced thereby) are herein sometimes referred to
as the "Act" of the Holders signing such instrument or instruments or so voting
at any such meeting. Proof of execution of any such instrument or of a writing
appointing any such agent, or of the holding by

                                       10
<PAGE>
 
any Person of a Security, shall be sufficient for any purpose of this Indenture
and conclusive in favor of the Trustee and the Company and any agent of the
Trustee or the Company, if made in the manner provided in this Section. The
record of any meeting of Holders of Securities shall be proved in the manner
provided in Section 1506.

  (b) The fact and date of the execution by any Person of any such instrument or
writing may be proved in any reasonable manner which the Trustee deems
sufficient.

  (c) The ownership of Registered Securities shall be proved by the Security
Register.

  (d) The ownership of Bearer Securities may be proved by the production of such
Bearer Securities or by a certificate executed, as depositary, by any trust
company, bank, banker or other depositary, wherever situated, if such
certificate shall be deemed by the Trustee to be satisfactory, showing that at
the date therein mentioned such Person had on deposit with such depositary, or
exhibited to it, the Bearer Securities therein described; or such facts may be
proved by the certificate or affidavit of the Person holding such Bearer
Securities if such certificate or affidavit is deemed by the Trustee to be
satisfactory. The Trustee and the Company may assume that such ownership of any
Bearer Security continues until (1) another certificate or affidavit bearing a
later date issued in respect of the same Bearer Security is produced, or (2)
such Bearer Security is produced to the Trustee by some other Person, or (3)
such Bearer Security is surrendered in exchange for a Registered Security, or
(4) such Bearer Security is no longer Outstanding. The ownership of Bearer
Securities may also be proved in any other manner which the Trustee deems
sufficient.

  (e) If the Company shall solicit from the Holders of Registered Securities any
request, demand, authorization, direction, notice, consent, waiver or other Act
the Company may, at its option, in or pursuant to a Board Resolution, fix in
advance a record date for the determination of Holders entitled to give such
request, demand, authorization, direction, notice, consent, waiver or other Act,
but the Company shall have no obligation to do so. Notwithstanding TIA Section
316(c), such record date shall be the record date specified in or pursuant to
such Board Resolution, which shall be a date not earlier than the date 30 days
prior to the first solicitation of Holders generally in connection therewith and
not later than the date such solicitation is completed. If such a record date is
fixed, such request, demand, authorization, direction, notice, consent, waiver
or other Act may be given before or after such record date, but only the Holders
of record at the close of business on such record date shall be deemed to be
Holders for the purposes of determining whether Holders of the requisite
proportion of Outstanding Securities have authorized or agreed or consented to
such request, demand, authorization, direction, notice, consent, waiver or other
Act, and for that purpose the Outstanding Securities shall be computed as of
such record date; provided that no such authorization, agreement or consent by
                  --------
the Holders on such record date shall be deemed effective unless it shall become
effective pursuant to the provisions of this Indenture not later than eleven
months after the record date.

  (f) 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, any
Security Registrar, any Paying Agent, any Authenticating Agent or the Company in
reliance thereon, whether or not notation of such action is made upon such
Security.

                                       11
<PAGE>
 
  Section 105  Notices, etc. to Trustee and Company.  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 to or with the
Trustee at its Corporate Trust Office, Attn: Corporate Trust Administration, 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
Indenture or at any other address previously furnished in writing to the Trustee
by the Company, in each case addressed to the attention of the Corporate Vice
President-Legal Services of the Company.

  Section 106  Notice to Holders; Waiver.  Where this Indenture provides for
               -------------------------
notice of any event to Holders of Registered Securities by the Company or the
Trustee, such notice shall be sufficiently given (unless otherwise herein
expressly provided) if in writing and mailed, first-class postage prepaid, to
each such Holder affected by such event, at his address as it appears in the
Security Register, not later than the latest date, and not earlier than the
earliest date, prescribed for the giving of such notice. In any case where
notice to Holders of Registered Securities 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
of Registered Securities or the sufficiency of any notice to Holders of Bearer
Securities given as provided herein. Any notice mailed to a Holder in the manner
herein prescribed shall be conclusively deemed to have been received by such
Holder, whether or not such Holder actually receives such notice.

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

  Except as otherwise expressly provided herein or otherwise specified with
respect to any Securities pursuant to Section 301, where this Indenture provides
for notice to Holders of Bearer Securities of any event, such notice shall be
sufficiently given if published in an Authorized Newspaper in the City of New
York and in such other city or cities as may be specified in such Securities on
a Business Day, such publication to be not later than the latest date, and not
earlier than the earliest date, prescribed for the giving of such notice.  Any
such notice shall be deemed to have been given on the date of such publication
or, if published more than once, on the date of the first such publication.

  If by reason of the suspension of publication of any Authorized Newspaper or
Authorized Newspapers or by reason of any other cause it shall be impracticable
to publish any notice to Holders of Bearer Securities as provided above, then
such notification to Holders of Bearer Securities as shall be given with the
approval of the Trustee shall constitute sufficient notice to such Holders for
every purpose hereunder.  Neither the failure to give notice by publication to
any particular Holder of Bearer Securities as provided above, nor any defect in
any notice so published, shall affect the sufficiency of such notice with
respect to other Holders of Bearer Securities or the sufficiency of any notice
to Holders of Registered Securities given as provided herein.

                                       12
<PAGE>
 
  Any request, demand, authorization, direction, notice, consent or waiver
required or permitted under this Indenture shall be in the English language,
except that any published notice may be in an official language of the country
of publication.

  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.

  Section 107  Effect of Headings and Table of Contents.  The Article and
               ----------------------------------------   
Section headings herein and the Table of Contents are for convenience only and
shall not affect the construction hereof.

  Section 108  Successors and Assigns.  All covenants and agreements in this
               ----------------------                                       
Indenture by the Company shall be binding on their successors and assigns,
whether so expressed or not.

  Section 109  Separability Clause.  In case any provision in this Indenture
               -------------------   
or in any Security or coupon 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 110  Benefits of Indenture.  Nothing in this Indenture, the
               ---------------------
Securities or coupons, express or implied, shall give to any Person, other than
the Parties hereto, any Security Registrar, any Paying Agent, any Authenticating
Agent and their respective successors hereunder, or the Holders, any benefit or
any legal or equitable right, remedy or claim under this Indenture.

  Sectin 111  No Personal Liability.  No recourse under or upon any obligation,
              ---------------------                                            
covenant or agreement contained in this Indenture, in any Security or coupon
appertaining thereto, or because of any indebtedness evidenced thereby, shall be
had against any promoter, as such, or against any past, present or future
shareowner, officer or trustee, as such, of the Company or of any successor,
either directly or through the Company or any successor, either directly or
through the Company or any successor, under any rule of law, statute or
constitutional provision or by the enforcement of any assessment or by any legal
or equitable proceeding or otherwise, all such liability being expressly waived
and released by the acceptance of the Securities by the Holders thereof and as
part of the consideration for the issue of the Securities.

  Section 112  Governing Law.  This Indenture and the Securities and coupons
               -------------
shall be governed by and construed in accordance with the law of the State of
New York. This Indenture is subject to the provisions of the TIA that are
required to be part of this Indenture and shall, to the extent applicable, be
governed by such provisions.

  Section 113  Legal Holidays.  In any case where any Interest Payment Date,
               --------------                                               
Redemption Date, Repayment Date, sinking fund paying date, Stated Maturity or
Maturity of any Security shall not be a Business Day at any Place of Payment,
then (notwithstanding any other provision of this Indenture or any Security or
coupon other than a provision in the Securities of any series which specifically
states that such provision shall apply in lieu hereof), payment of Interest or
any Additional Amounts or principal (and premium or Make-Whole amount, if any)
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, Redemption Date, Repayment Date
or sinking fund payment date, or at the Stated Maturity or Maturity, provided
                                                                     --------
that no interest shall accrue on the amount so

                                       13
<PAGE>
 
payable for the period from and after such Interest Payment Date, Redemption
Date, Repayment Date, sinking fund payment date, Stated Maturity or Maturity, as
the case may be.

  Section 114  Conflict with Trust Indenture Act.  If this Indenture is
               ---------------------------------   
qualified under the TIA and any provision hereof limits, qualifies or conflicts
with another provision hereof which is required to be included in this Indenture
by any of the provisions of the TIA, such required provision shall control.

                                  ARTICLE II

                               SECURITIES FORMS

 Section 201  Forms of Securities.  The Registered Securities, if any, of each
              -------------------   
series and the Bearer Securities, if any, of each series and related coupons
shall be in substantially the forms as shall be established in one or more
indentures supplemental hereto or approved from time to time by or pursuant to a
Board Resolution in accordance with this Indenture, shall have such appropriate
insertions, omissions, substitutions and other variations as are required or
permitted by this Indenture or any indenture supplemental hereto, and may have
such letters, numbers or other marks of identification or designation and such
legends or endorsements placed thereon as the Company may deem appropriate and
as are not inconsistent with the provisions of this Indenture or any indenture
supplemental hereto, or as may be required to comply with any law or with any
rule or regulation made pursuant thereto or with any rule or regulation of any
stock exchange on which the Securities may be listed, or as may, consistently
herewith, be determined by the officers executing such Securities, as evidenced
by their execution of the Securities, or to conform to usage.

  Unless otherwise specified as contemplated by Section 301, Bearer Securities
shall have interest coupons attached.

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

  Section 202  Form of Trustee's Certificate of Authentication.  Subject to
               -----------------------------------------------   
Section 613, the Trustee's certificate of authentication shall be in
substantially the following form:

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

                                       THE CHASE MANHATTAN BANK, as Trustee


                                       By:
                                       Authorized Officer

  Section 203  Securities Issuable in Global Form.  If Securities of or within
               ----------------------------------   
a series are issuable in global form, as specified as contemplated by Section
301, then, notwithstanding clause (8) of Section 301 and the provisions of
Section 302, any such Security shall represent such of the Outstanding
Securities of such series as shall be specified therein and may provide that it
shall represent the aggregate amount of Outstanding Securities of such series
from time to time endorsed thereon and that the aggregate amount of Outstanding
Securities of such series represented thereby may from time to time be increased
or decreased to reflect exchanges. Any

                                       14
<PAGE>
 
endorsement of a Security in global form to reflect the amount, or any increase
or decrease in the amount, of Outstanding Securities represented thereby shall
be made by the Trustee in such manner and upon instructions given by such Person
or Persons as shall be specified therein or in the Company Order to be delivered
to the Trustee pursuant to Section 303 or 304. Subject to the provisions of
Section 303 and, if applicable, Section 304, the Trustee shall deliver and
redeliver any Security in permanent global form in the manner and upon
instructions given by the Person or Persons specified therein or in the
applicable Company Order. If a Company Order pursuant to Section 303 or 304 has
been, or simultaneously is, delivered, any instructions by the Company with
respect to endorsement or delivery or redelivery of a Security in global form
shall be in writing but need not comply with Section 102 and need not be
accompanied by an Opinion of Counsel.

  The provisions of the last sentence of Section 303 shall apply to any Security
represented by a Security in global form if such Security was never issued and
sold by the Company and the Company delivers to the Trustee the Security in
global form together with written instructions (which need not comply with
Section 102 and need not be accompanied by an Opinion of Counsel) with regard to
the reduction in the principal amount of Securities represented thereby,
together with the written statement contemplated by the last sentence of Section
303.

  Notwithstanding the provisions of Section 307, unless otherwise specified as
contemplated by Section 301, payment of principal of or any premium and interest
on any Security in permanent global form shall be made to the Person or Persons
specified therein.

  Notwithstanding the provisions of Section 308 and except as provided in the
preceding paragraph, the Company, the Trustee and any agent of the Company and
the Trustee shall treat as the Holder of such principal amount of Outstanding
Securities represented by a permanent global Security (i) in the case of a
permanent global Security in registered form, the Holder of such permanent
global Security in registered form, or (ii) in the case of a permanent global
Security in bearer form, Euroclear or CEDEL.

                                  ARTICLE III

                                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 one or more Board Resolutions or pursuant to authority granted by one or more
Board Resolutions and, subject to Section 303, set forth, or determined in the
manner provided, in an Officers' Certificate complying with Section 102, or
established in one or more indentures supplemental hereto, prior to the issuance
of Securities of any series, any or all of the following, as applicable (each of
which (except for the matters set forth in clauses (1), (2) and (15) below), if
so provided, may be determined from time to time by the Company with respect to
unissued Securities of the series when issued from time to time):

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

  (2) any limit upon the aggregate principal amount of the Securities of the
series that may be authenticated and delivered under this Indenture (except for
Securities authenticated and

                                       15
<PAGE>
 
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, 1107 or
1305);

  (3) the date or dates, or the method by which such date or dates will be
determined, on which the principal of the Securities of the series shall be
payable;

  (4) the rate or rates at which the Securities of the series shall bear
interest, if any, or the method by which such rate or rates shall be determined,
the date or dates from which such interest shall accrue or the method by which
such date or dates shall be determined, the Interest Payment Dates on which such
interest will be payable and the Regular Record Date, if any, for the interest
payable on any Registered Security on any Interest Payment Date, or the method
by which such date shall be determined, and the basis upon which interest shall
be calculated if other than that of a 360-day year of twelve 30-day months;

  (5) the place or places, if any, other than or in addition to the Borough of
Manhattan, the City of New York, where the principal of (and premium or Make-
Whole Amount, if any), interest, if any, on, and Additional Amounts, if any,
payable in respect of, Securities of the series shall be payable, any Registered
Securities of the series may be surrendered for registration of transfer,
exchange or conversion and notices or demands to or upon the Company in respect
of the Securities of the series and this Indenture may be served;

  (6) the period or periods within which, the price or prices (including the
premium or Make-Whole Amount, if any) at which, the currency or currencies,
currency unit or units or composite currency or currencies in which, and other
terms and conditions upon which Securities of the series may be redeemed, in
whole or in part, at the option of the Company, if the Company is to have the
option;

  (7) the obligation, if any, of the Company to redeem, repay or purchase
Securities of the series pursuant to any provision herein or at the option of a
Holder thereof, and the period or periods within which or the date or dates on
which, the price or prices at which, the currency or currencies, currency unit
or units or composite currency or currencies in which, and other terms and
conditions upon which Securities of the series shall be redeemed, repaid or
purchased (including without limitation whether, and the extent to which, the
premium shall be payable in connection therewith), in whole or in part, pursuant
to such obligation.

  (8) if other than denominations of $1,000 and any integral multiple thereof,
the denominations in which any Registered Securities of the series shall be
issuable and, if other than the denomination of $5,000, the denomination or
denominations in which any Bearer Securities of the series shall be issuable;

  (9) if other than the Trustee, the identity of each Security Registrar and/or
Paying Agent;

  (10) if other than the principal amount thereof, the portion of the principal
amount of Securities of the series that is convertible in accordance with the
provisions of this Indenture, or the method by which such portion shall be
determined;

  (11) if other than Dollars, the Foreign Currency or Currencies in which
payment of the principal of (and premium or Make-Whole Amount, if any) or
interest or Additional Amounts,

                                       16
<PAGE>
 
if any, on the Securities of the series shall be payable or in which the
Securities of the series shall be denominated;

  (12) whether the amount of payments of principal of (and premium or Make-Whole
Amount, if any) or interest, if any, on the Securities of the series may be
determined with reference to an index, formula or other method (which index,
formula or method may be based, without limitation, on one or more currencies,
currency units, composite currencies, commodities, equity indices or other
indices), and the manner in which such amounts shall be determined.

  (13) whether the principal of (and premium or Make-Whole Amount, if any) or
interest or Additional Amounts, if any, on the Securities of the series are to
be payable, at the election of the Company, or a Holder thereof, in a currency
or currencies, currency unit or units or composite currency or currencies other
than that in which such Securities are denominated or stated to be payable, the
period or periods within which, and the terms and conditions upon which, such
election may be made, and the time and manner of, and identity of the exchange
rate agent with responsibility for, determining the exchange rate between the
currency or currencies, currency unit or units or composite currency or
currencies in which such Securities are denominated or stated to be payable and
the currency or currencies, currency unit or units or composite currency or
currencies in which such Securities are to be so payable;

  (14) provisions, if any, granting special rights to the Holders of Securities
of the series upon the occurrence of such events as may be specified;

  (15) any deletions from, modifications of or additions to the Events of
Default or covenants of the Company with respect to Securities of the series,
whether or not such Events of Default or covenants are consistent with the
Events of Default or covenants set forth herein;

  (16) whether Securities of the series are to be issuable as Registered
Securities, Bearer Securities (with or without coupons) or both, any
restrictions applicable to the offer, sale or delivery of Bearer Securities and
the terms upon which Bearer Securities of the series may be exchanged for
Registered Securities of the series and vice versa (if permitted by applicable
laws and regulations), whether any Securities of the series are to be issuable
initially in temporary global form and whether any Securities of the series are
to be issuable in permanent global form with or without coupons and, if so,
whether beneficial owners of interests in any such permanent global Security may
exchange such interests for Securities of such series and of like tenor of any
authorized form and denomination and the circumstances under which any such
exchanges may occur, if other than in the manner provided in Section 305, and,
if Registered Securities of the series are to be issuable as a global Security,
the identity of the depositary for such series;

  (17) the date as of which any Bearer Securities of the series and any
temporary global Security representing Outstanding Securities of the series
shall be dated if other than the date of original issuance of the first Security
of the series to be issued;

  (18) the Person to whom any interest on any Registered 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, the manner in which, or the Person to
whom, any interest on any Bearer Security of the series shall be payable, if
otherwise than upon presentation and surrender of the coupons appertaining
thereto as they severally mature, and the extent to which, or the manner in
which, any interest payable on

                                       17
<PAGE>
 
a temporary global Security on an Interest Payment Date will be paid if other
than in the manner provided in Section 304;

  (19) the applicability, if any, of Sections 1402 and/or 1403 to the Securities
of the series and any provisions in modification of, in addition to or in lieu
of any of the provisions of Article XIV;

  (20) if the Securities of such series are to be issuable in definitive form
(whether upon original issue or upon exchange of a temporary Security of such
series) only upon receipt of certain certificates or other documents or
satisfaction of other conditions, then the form and/or terms of such
certificates, documents or conditions;

  (21) if the Securities of the series are to be issued upon the exercise of
warrants, the time, manner and place for such Securities to be authenticated and
delivered;

  (22) whether and under what circumstances the Company will pay Additional
Amounts as contemplated by Section 1012 on the Securities of the series to any
Holder who is not a United States Person (including any modification to the
definition of such term) in respect of any tax, assessment or governmental
charge and, if so, whether the Company will have the option to redeem such
Securities rather than pay such Additional Amounts (and the terms of any such
option); and

  (23) any other terms of the series (which terms shall not be inconsistent with
the provisions of this Indenture).

  All Securities of any one series and the coupons appertaining to any Bearer
Securities of such series shall be substantially identical except, in the case
of Registered Securities, as to denomination and except as may otherwise be
provided in or pursuant to such Board Resolution (subject to Section 303) and
set forth in such Officers' Certificate or in any such indenture supplemental
hereto.  All Securities of any one series need not be issued at the same time
and, unless otherwise provided, a series may be reopened, without the consent of
the Holders, for issuances of additional Securities of such series.

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

  Section 302  Denominations.  The Securities of each series shall be issuable
               -------------
in such denominations as shall be specified as contemplated by Section 301. With
respect to Securities of any series denominated in Dollars, in the absence of
any such provisions with respect to the Securities of any series, the Registered
Securities of such series, other than Registered Securities issued in global
form (which may be of any denomination), shall be issuable in denominations of
$1,000 and any integral multiple thereof and the Bearer Securities of such
series, other than Bearer Securities issued in global form (which may be of any
denomination), shall be issuable in a denomination of $5,000.

  Section 303  Execution, Authentication, Delivery and Dating.  The Securities
               ----------------------------------------------   
and any coupons appertaining thereto shall be executed by (i) the Company's
Chairman of the Board,

                                       18
<PAGE>
 
President, or one of its Executive Vice Presidents, and (ii) its Chief Financial
Officer. The signature of any of these officers on the Securities and coupons
may be manual or facsimile signatures of the present or any future such
authorized officer and may be imprinted or otherwise reproduced on the
Securities.

  Securities or coupons 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 or coupons.

  At any time and from time to time after the execution and delivery of this
Indenture, the Company may deliver Securities of any series, together with any
coupon appertaining thereto, 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; provided, however, that,
                                                      --------  -------       
in connection with its original issuance, no Bearer Security shall be mailed or
otherwise delivered to any location in the United States; and provided further
                                                              -------- -------
that, unless otherwise specified with respect to any series of Securities
pursuant to Section 301, a Bearer Security may be delivered in connection with
its original issuance only if the Person entitled to receive such Bearer
Security shall have furnished a certificate to Euroclear or CEDEL, as the case
may be, in the form set forth in Exhibit A-1 to this Indenture or such other
certificate as may be specified with respect to any series of Securities
pursuant to Section 301, dated no earlier than 15 days prior to the earlier of
the date on which such Bearer Security is delivered and the date on which any
temporary Security first becomes exchangeable for such Bearer Security in
accordance with the terms of such temporary Security and this Indenture.  If any
Security shall be represented by a permanent global Bearer Security, then, for
purposes of this Section and Section 304, the notation of a beneficial owner's
interest therein upon original issuance of such Security or upon exchange of a
portion of a temporary global Security shall be deemed to be delivery in
connection with its original issuance of such beneficial owner's interest in
such permanent global Security.  Except as permitted by Section 306, the Trustee
shall not authenticate and deliver any Bearer Security unless all appurtenant
coupons for interest then matured have been detached and canceled.

  If all the Securities of any series are not to be issued at one time and if
the Board Resolution or supplemental indenture establishing such series shall so
permit, such Company Order may set forth procedures acceptable to the Trustee
for the issuance of such Securities and determining the terms of particular
Securities of such series, such as interest rate or formula, maturity date, date
of issuance and date from which interest shall accrue. 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 TIA Section 315(a) through 315(d)) shall be fully protected in
relying upon:

  (a) an Opinion of Counsel complying with Section 102 and stating that

       (i)     the form or forms of such Securities and any coupons have been
established in conformity with the provisions of this Indenture;

       (ii)    the terms of such Securities and any coupons have been
established in conformity with the provisions of this Indenture; and

                                       19
<PAGE>
 
       (iii)   such Securities, together with any coupons appertaining thereto,
when completed by appropriate insertions and executed and delivered by the
Company to the Trustee for authentication in accordance with this Indenture,
authenticated and delivered by the Trustee in accordance with this Indenture and
issued by the Company in the manner and subject to any conditions specified in
such Opinion of Counsel, will constitute legal, valid and binding obligations of
the Company, enforceable in accordance with their terms, subject to applicable
bankruptcy, insolvency, reorganization and other similar laws of general
applicability relating to or affecting the enforcement of creditors' rights
generally and to general equitable principles; and

  (b) an Officers' Certificate stating that all conditions precedent provided
for in this Indenture relating to the issuance of the Securities have been
complied with and that, to the best of the knowledge of the signers of such
certificate, that no Event of Default with respect to any of the Securities
shall have occurred and be continuing.

  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,
obligations 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 the Securities of any series are not to be issued at one time, it shall
not be necessary to deliver an Officers' Certificate otherwise required pursuant
to Section 301 or a Company Order, or an Opinion of Counsel or an Officers'
Certificate otherwise required pursuant to the preceding paragraph at the time
of issuance of each Security of such series, but such order, opinion and
certificates, with appropriate modifications to cover such future issuances,
shall be delivered at or before the time of issuance of the first Security of
such series.

  Each Registered Security shall be dated the date of its authentication and
each Bearer Security shall be dated as of the date specified as contemplated by
Section 301.

  No Security or coupon shall be entitled to any benefit under this Indenture or
be valid or obligatory for any purpose unless there appears on such Security or
Security to which such coupon appertains a certificate of authentication
substantially in the form provided for herein duly executed by the Trustee by
manual signature of an authorized officer, and such certificate upon any
Security shall be conclusive evidence, and the only evidence, that such Security
has been duly authenticated and delivered hereunder and is entitled to the
benefits of this Indenture.  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 together with a written statement (which
need not comply with Section 102 and need not be accompanied by an Opinion of
Counsel) stating that such Security has never been issued and sold by the
Company, 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.
               -------------------- 

  (a) 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

                                       20
<PAGE>
 
any authorized denomination, substantially of the tenor of the definitive
Securities in lieu of which they are issued, in registered form, or, if
authorized, in bearer form with one or more coupons or without coupons, and with
such appropriate insertions, omissions, substitutions and other variations as
the officers executing such Securities may determine, as conclusively evidenced
by their execution of such Securities. In the case of Securities of any series,
such temporary Securities may be in global form.

  Except in the case of temporary Securities in global form (which shall be
exchanged in accordance with Section 304(b) or as otherwise provided in or
pursuant to a Board Resolution), 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
(accompanied by any nonmatured coupons appertaining thereto), the Company shall
execute and the Trustee shall authenticate and deliver in exchange therefor a
like principal amount of definitive Securities of the same series of authorized
denominations; provided, however, that no definitive Bearer Security shall be
               --------  -------                                             
delivered in exchange for a temporary Registered Security; and provided further
                                                               -------- -------
that a definitive Bearer Security shall be delivered in exchange for a temporary
Bearer Security only in compliance with the conditions set forth in Section 303.
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.

  (b) Unless otherwise provided in or pursuant to a Board Resolution, this
Section 304(b) shall govern the exchange of temporary Securities issued in
global form other than through the facilities of The Depository Trust Company.
If any such temporary Security is issued in global form, then such temporary
global Security shall, unless otherwise provided therein, be delivered to the
London office of a depositary or common depositary (the "Common Depositary"),
for the benefit of Euroclear and CEDEL for credit to the respective accounts of
the beneficial owners of such Securities (or to such other accounts as they may
direct).

  Without unnecessary delay but in any event not later than the date specified
in, or determined pursuant to the terms of, any such temporary global Security
(the "Exchange Date"), the Company shall deliver to the Trustee definitive
Securities, in aggregate principal amount equal to the principal amount of such
temporary global Security, executed by the Company. On or after the Exchange
Date, such temporary global Security shall be surrendered by the Common
Depositary to the Trustee, as the Company's agent for such purpose, to be
exchanged, in whole or from time to time in part, for definitive Securities
without charge, and the Trustee shall authenticate and deliver, in exchange for
each portion of such temporary global Security, an equal aggregate principal
amount of definitive Securities of the same series of authorized denominations
and of like tenor as the portion of such temporary global Security to be
exchanged. The definitive Securities to be delivered in exchange for any such
temporary global Security shall be in bearer form, registered form, permanent
global bearer form or permanent global registered form, or any combination
thereof as specified as contemplated by Section 301, and, if any combination
thereof is so specified, as requested by the beneficial owner thereof; provided,
                                                                       -------- 
however, that, unless otherwise specified in such temporary global Security,
- -------                                                                     
upon such presentation by the Common Depositary, such temporary global Security
shall be accompanied by a certificate dated the Exchange Date or a subsequent
date and signed by Euroclear as to the portion of such temporary global Security
held for its account then to be exchanged and a certificate dated the Exchange
Date or a subsequent date and signed by CEDEL as to the portion of such
temporary global Security held for its account then to be exchanged, each in the
form set

                                       21
<PAGE>
 
forth in Exhibit A-2 to this Indenture or in such other form as may be
established pursuant to Section 301; and provided further that definitive Bearer
                                         -------- -------                       
Securities shall be delivered in exchange for a portion of a temporary global
Security only in compliance with the requirements of Section 303.

  Unless otherwise specified in such temporary global Security, the interest of
a beneficial owner of Securities of a series in a temporary global Security
shall be exchanged for definitive Securities of the same series and of like
tenor following the Exchange Date when the account holder instructs Euroclear or
CEDEL, as the case may be, to request such exchange on his behalf and delivers
to Euroclear or CEDEL, as the case may be, a certificate in the form set forth
in Exhibit A-1 to this Indenture (or in such other form as may be established
pursuant to Section 301), dated no earlier than 15 days prior to the Exchange
Date, copies of which certificate shall be available from the offices of
Euroclear and CEDEL, the Trustee, any Authenticating Agent appointed for such
series of Securities and each Paying Agent. Unless otherwise specified in such
temporary global Security, any such exchange shall be made free of charge to the
beneficial owners of such temporary global Security, except that a Person
receiving definitive Securities must bear the cost of insurance, postage,
transportation and the like unless such Person takes delivery of such definitive
Securities in person at the offices of Euroclear or CEDEL. Definitive Securities
in bearer form to be delivered in exchange for any portion of a temporary global
Security shall be delivered only outside the United States.

  Until exchanged in full as hereinabove provided, the temporary Securities of
any series shall in all respects be entitled to the same benefits under this
Indenture as definitive Securities of the same series and of like tenor
authenticated and delivered hereunder, except that, unless otherwise specified
as contemplated by Section 301, interest payable on a temporary global Security
on an Interest Payment Date for Securities of such series occurring prior to the
applicable Exchange Date shall be payable to Euroclear and CEDEL on such
Interest Payment Date upon delivery by Euroclear and CEDEL to the Trustee of a
certificate or certificates in the form set forth in Exhibit A-2 to this
Indenture (or in such other forms as may be established pursuant to Section
301), for credit without further interest on or after such Interest Payment Date
to the respective accounts of Persons who are the beneficial owners of such
temporary global Security on such Interest Payment Date and who have each
delivered to Euroclear or CEDEL, as the case may be, a certificate dated no
earlier than 15 days prior to the Interest Payment Date occurring prior to such
Exchange Date in the form set forth as Exhibit A-1 to this Indenture (or in such
other forms as may be established pursuant to Section 301). Notwithstanding
anything to the contrary herein contained, the certifications made pursuant to
this paragraph shall satisfy the certification requirements of the preceding two
paragraphs of this Section 304(b) and of the third paragraph of Section 303 of
this Indenture and the interests of the Persons who are the beneficial owners of
the temporary global Security with respect to which such certification was made
will be exchanged for definitive Securities of the same series and of like tenor
on the Exchange Date or the date of certification if such date occurs after the
Exchange Date, without further act or deed by such beneficial owners. Except as
otherwise provided in this paragraph, no payments of principal or interest owing
with respect to a beneficial interest in a temporary global Security will be
made unless and until such interest in such temporary global Security shall have
been exchanged for an interest in a definitive Security. Any interest so
received by Euroclear and CEDEL and not paid as herein provided shall be
returned to the Trustee prior to the expiration of two years after such Interest
Payment Date in order to be repaid to the Company.

  Section 305  Registration, Registration of Transfer and Exchange. The Company
               ---------------------------------------------------   
shall cause to be kept at the Corporate Trust Office of the Trustee or in any
office or agency of the Company in a Place of Payment a register for each series
of Securities (the registers maintained in such office or in any such office or
agency of the Company in a Place of Payment being herein

                                       22
<PAGE>
 
sometimes referred to collectively as the "Security Register") in which, subject
to such reasonable regulations as it may prescribe, the Company shall provide
for the registration of Registered Securities and of transfer of Registered
Securities. The Security Register shall be in written form or any other form
capable of being converted into written form within a reasonable time. The
Trustee, at its Corporate Trust Office, is hereby initially appointed "Security
Registrar" for the purpose of registering Registered Securities and transfers of
Registered Securities on such Security Register as herein provided. In the event
that the Trustee shall cease to be Security Registrar, it shall have the right
to examine the Security Register at all reasonable times.

  Subject to the provisions of this Section 305, upon surrender for registration
of transfer of any Registered Security of any series at any 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 Registered Securities of the same
series, of any authorized denominations and of a like aggregate principal
amount, bearing a number not contemporaneously outstanding, and containing
identical terms and provisions.

  Subject to the provisions of this Section 305, at the option of the Holder,
Registered Securities of any series may be exchanged for other Registered
Securities of the same series, of any authorized denomination or denominations
and of a like aggregate principal amount, containing identical terms and
provisions, upon surrender of the Registered Securities to be exchanged at any
such office or agency.  Whenever any such Registered Securities are so
surrendered for exchange, the Company shall execute, and the Trustee shall
authenticate and deliver, the Registered Securities which the Holder making the
exchange is entitled to receive.  Unless otherwise specified with respect to any
series of Securities as contemplated by Section 301, Bearer Securities may not
be issued in exchange for Registered Securities.

  If (but only if) permitted by the applicable Board Resolution and (subject to
Section 303) set forth in the applicable Officers' Certificate, or in any
indenture supplemental hereto, delivered as contemplated by Section 301, at the
option of the Holder, Bearer Securities of any series may be exchanged for
Registered Securities of the same series of any authorized denominations and of
a like aggregate principal amount and tenor, upon surrender of the Bearer
Securities to be exchanged at any such office or agency, with all unmatured
coupons and all matured coupons in default thereto appertaining.  If the Holder
of a Bearer Security is unable to produce any such unmatured coupon or coupons
or matured coupon or coupons in default, any such permitted exchange may be
effected if the Bearer Securities are accompanied by payment in funds acceptable
to the Company in an amount equal to the face amount of such missing coupon or
coupons, or the surrender of such missing coupon or coupons may be waived by the
Company and the Trustee if there is furnished to them such security or indemnity
as they may require to save each of them and any Paying Agent harmless.  If
thereafter the Holder of such Security shall surrender to any Paying Agent any
such missing coupon in respect of which such a payment shall have been made,
such Holder shall be entitled to receive the amount of such payment; provided,
                                                                     -------- 
however, that, except as otherwise provided in Section 1002, interest
- -------                                                              
represented by coupons shall be payable only upon presentation and surrender of
those coupons at an office or agency located outside the United States.
Notwithstanding the foregoing, in case a Bearer Security of any series is
surrendered at any such office or agency in a permitted exchange for a
Registered Security of the same series and like tenor after the close of
business at such office or agency on (i) any Regular Record Date and before the
opening of business at such office or agency on the relevant Interest Payment
Date, or (ii) any Special Record Date and before the opening of business at such
office or agency on the related proposed date for payment of Defaulted Interest,
such Bearer Security shall be surrendered without the coupon relating to such
Interest Payment

                                       23
<PAGE>
 
Date or proposed date for payment, as the case may be, and interest or Defaulted
Interest, as the case may be, will not be payable on such Interest Payment Date
or proposed date for payment, as the case may be, in respect of the Registered
Security issued in exchange for such Bearer Security, but will be payable only
to the Holder of such coupon when due in accordance with the provisions of this
Indenture. 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.

  Notwithstanding the foregoing, except as otherwise specified as contemplated
by Section 301, any permanent global Security shall be exchangeable only as
provided in this paragraph. If the depositary for any permanent global Security
is "DTC", then, unless the terms of such global Security expressly permit such
global Security to be exchanged in whole or in part for definitive Securities, a
global Security may be transferred, in whole but not in part, only to a nominee
of DTC, or by a nominee of DTC to DTC, or to a successor to DTC for such global
Security selected or approved by the Company or to a nominee of such successor
to DTC. If at any time DTC notifies the Company that it is unwilling or unable
to continue as depositary for the applicable global Security or Securities or if
at any time DTC ceases to be a clearing agency registered under the Exchange Act
if so required by applicable law or regulation, the Company shall appoint a
successor depositary with respect to such global Security or Securities. If (x)
a successor depositary for such global Security or Securities is not appointed
by the Company within 90 days after the Company receives such notice or becomes
aware of such unwillingness, inability or ineligibility, (y) an Event of Default
has occurred and is continuing and the beneficial owners representing a majority
in principal amount of the applicable series of Securities represented by such
global Security or Securities advise DTC to cease acting as depositary for such
global Security or Securities or (z) the Company, in its sole discretion,
determines at any time that all Outstanding Securities (but not less than all)
of any series issued or issuable in the form of one or more global Securities
shall no longer be represented by such global Security or Securities, then the
Company shall execute, and the Trustee, upon receipt of a Company Order for the
authentication and delivery of definitive Securities of said issue, shall
authenticate and deliver definitive Securities of like series, rank, tenor and
terms in definitive form in an aggregate principal amount equal to the principal
amount of such global Security or Securities. If any beneficial owner of an
interest in a permanent global Security is otherwise entitled to exchange such
interest for Securities of such series and of like tenor and principal amount of
another authorized form and denomination, as specified as contemplated by
Section 301 and provided that any applicable notice provided in the permanent
global Security shall have been given, then without unnecessary delay but in any
event not later than the earliest date on which such interest may be so
exchanged, the Company shall execute, and the Trustee, upon receipt of a Company
Order for the authentication and delivery of definitive Securities of said
issue, shall authenticate and deliver definitive Securities in aggregate
principal amount equal to the principal amount of such beneficial owner's
interest in such permanent global Security. On or after the earliest date on
which such interests may be so exchanged, such permanent global Security shall
be surrendered for exchange by DTC or such other depositary as shall be
specified in the Company Order with respect thereto to the Trustee, as the
Company's agent for such purpose; provided, however, that no such exchanges may
                                  --------  -------                            
occur during a period beginning at the opening of business 15 days before any
selection of Securities to be redeemed and ending on the relevant Redemption
Date if the Security for which exchange is requested may be among those selected
for redemption; and provided further that no Bearer Security delivered in
                    -------- -------                                     
exchange for a portion of a permanent global Security shall be mailed or
otherwise delivered to any location in the United States.  If a Registered
Security is issued in exchange for any portion of a permanent global Security
after the close of business at the office or agency where such exchange occurs
on (i) any Regular Record Date and before the opening of business at such office
or agency on the relevant Interest Payment Date, or (ii) any Special Record Date
and before the opening of business at such office or agency on the related
proposed date for payment of interest or Defaulted Interest, as the

                                       24
<PAGE>
 
case may be, will not be payable on such Interest Payment Date or proposed date
for payment, as the case may be, in respect of such Registered Security, but
will be payable on such Interest Payment Date or proposed date for payment, as
the case may be, only to the Person to whom interest in respect of such portion
of such permanent global Security is payable in accordance with the provisions
of this Indenture.

  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 Registered Security presented or surrendered for registration of
transfer or for exchange or redemption shall (if so required by the Company, the
Trustee or the Security Registrar) 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 his 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, 1107 or 1305 not involving any transfer.

  The Company, or the Trustee, as applicable, shall not be required (i) to
issue, register the transfer of or exchange any Security if such Security may be
among those selected for redemption during a period beginning at the opening of
business 15 days before selection of the Securities to be redeemed under Section
1103 and ending at the close of business on (A) if such Securities are issuable
only as Registered Securities, the day of the mailing of the relevant notice of
redemption and (B) if such Securities are issuable as Bearer Securities, the day
of the first publication of the relevant notice of redemption or, if such
Securities are also issuable as Registered Securities and there is no
publication, the mailing of the relevant notice of redemption, or (ii) to
register the transfer of or exchange any Registered Security so selected for
redemption in whole or in part, except, in the case of any Registered Security
to be redeemed in part, the portion thereof not to be redeemed, or (iii) to
exchange any Bearer Security so selected for redemption except that such a
Bearer Security may be exchanged for a Registered Security of that series and
like tenor, provided that such Registered Security shall be simultaneously
            --------                                                      
surrendered for redemption, or (iv) to issue, register the transfer of or
exchange any Security which has been surrendered for repayment at the option of
the Holder, except the portion, if any, of such Security not to be so repaid.

  Section 306  Mutilated, Destroyed, Lost and Stolen Securities.  If any
               ------------------------------------------------  
mutilated Security or a Security with a mutilated coupon appertaining to it is
surrendered to the Trustee or the Company, together with, in proper cases, such
security or indemnity as may be required by the Company or the Trustee to save
each of them or any agent of either of them harmless, the Company shall execute
and the Trustee shall authenticate and deliver in exchange therefor a new
Security of the same series and principal amount, containing identical terms and
provisions and bearing a number not contemporaneously outstanding, with coupons
corresponding to the coupons, if any, appertaining to the surrendered Security.

  If there shall be delivered to the Company and to the Trustee (i) evidence to
their satisfaction of the destruction, loss or theft of any Security or coupon,
and (ii) such security or indemnity as may be required by them to save each of
them and any agent of either of them

                                       25
<PAGE>
 
harmless, then, in the absence of notice to the Company or the Trustee that such
Security or coupon has been acquired by a bona fide purchaser, the Company shall
execute and upon its request the Trustee shall authenticate and deliver, in lieu
of any such destroyed, lost or stolen Security or in exchange for the Security
to which a destroyed, lost or stolen coupon appertains (with all appurtenant
coupons not destroyed, lost or stolen), a new Security of the same series and
principal amount, containing identical terms and provisions and bearing a number
not contemporaneously outstanding, with coupons corresponding to the coupons, if
any, appertaining to such destroyed, lost or stolen Security or to the Security
to which such destroyed, lost or stolen coupon appertains.

  Notwithstanding the provisions of the previous two paragraphs, in case any
such mutilated, destroyed, lost or stolen Security or coupon has become or is
about to become due and payable, the Company in its discretion may, instead of
issuing a new Security, with coupons corresponding to the coupons, if any,
appertaining to such destroyed, lost or stolen Security or to the Security to
which such destroyed, lost or stolen coupon appertains, pay such Security or
coupon; provided, however, that payment of principal of (and premium or
        --------  -------
Make-Whole Amount, if any), any interest on and any Additional Amounts with
respect to, Bearer Securities shall, except as otherwise provided in Section
1002, be payable only at an office or agency located outside the United States
and, unless otherwise specified as contemplated by Section 301, any interest on
Bearer Securities shall be payable only upon presentation and surrender of the
coupons appertaining thereto.

  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 with its coupons, if any, issued pursuant to
this Section in lieu of any destroyed, lost or stolen Security, or in exchange
for a Security to which a destroyed, lost or stolen coupon appertains, shall
constitute an original additional contractual obligation of the Company, whether
or not the destroyed, lost or stolen Security and its coupons, if any, or the
destroyed, lost or stolen coupon 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 and their
coupons, if any, 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 or coupons.

  Section 307  Payment of Interest; Interest Rights Preserved.  Except as
               ----------------------------------------------  
otherwise specified with respect to a series of Securities in accordance with
the provisions of Section 301, interest on any Registered Security that 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 at the office or agency of the Company maintained
for such purpose pursuant to Section 1002; provided, however, that each
                                           --------  -------  
installment of interest on any Registered Security may at the Company's option
be paid by (i) mailing a check for such interest, payable to or upon the written
order of the Person entitled thereto pursuant to Section 308, to the address of
such Person as it appears on the Security Register or (ii) transfer to an
account maintained by the payee located inside the United States.

                                       26
<PAGE>
 
  Unless otherwise provided as contemplated by Section 301 with respect to the
Securities of any series, payment of interest may be made, in the case of a
Bearer Security, by transfer to an account maintained by the payee with a bank
located outside the United States.

  Unless otherwise provided as contemplated by Section 301, every permanent
global Security will provide that interest, if any, payable on any Interest
Payment Date will be paid to DTC, Euroclear and/or CEDEL, as the case may be,
with respect to that portion of such permanent global Security held for its
account by Cede & Co. or the Common Depositary, as the case may be, for the
purpose of permitting such party to credit the interest received by it in
respect of such permanent global Security to the accounts of the beneficial
owners thereof.

  In case a Bearer Security of any series is surrendered in exchange for a
Registered Security of such series after the close of business (at an office or
agency in a Place of Payment for such series) on any Regular Record Date and
before the opening of business (at such office or agency) on the next succeeding
Interest Payment Date, such Bearer Security shall be surrendered without the
coupon relating to such Interest Payment Date and interest will not be payable
on such Interest Payment Date in respect of the Registered Security issued in
exchange for such Bearer Security, but will be payable only to the Holder of
such coupon when due in accordance with the provisions of this Indenture.

  Except as otherwise specified with respect to a series of Securities in
accordance with the provisions of Section 301, any interest on any Registered
Security of any series that 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 registered Holder thereof 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 Registered 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 Registered
Security of such series and the date of the proposed payment (which shall not be
less than 20 days after such notice is received by the Trustee), and at the same
time the Company shall deposit with the Trustee an amount of money in the
currency or currencies, currency unit or units or composite currency or
currencies in which the Securities of such series are payable (except as
otherwise specified pursuant to Section 301 for the Securities of such series)
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 mailed, first-class postage prepaid, to each Holder of Registered
Securities of such series at his address as it appears in the Security Register
not less than 10 days prior to such Special Record Date.  The Trustee may, in
its discretion, in the name and at the expense of the Company, cause a similar
notice to be published at least once in an Authorized Newspaper in each Place of
Payment, but such publications shall not be a condition precedent to the

                                       27
<PAGE>
 
establishment of such Special Record Date.  Notice of the proposed payment of
such Defaulted Interest and the Special Record Date therefor having been mailed
as aforesaid, such Defaulted Interest shall be paid to the Persons in whose
names the Registered 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).  In case a
Bearer Security of any series is surrendered at the office or agency in a Place
of Payment for such series in exchange for a Registered Security of such series
after the close of business at such office or agency on any Special Record Date
and before the opening of business at such office or agency on the related
proposed date for payment of Defaulted Interest, such Bearer Security shall be
surrendered without the coupon relating to such proposed date of payment and
Defaulted Interest will not be payable on such proposed date of payment in
respect of the Registered Security issued in exchange for such Bearer Security,
but will be payable only to the Holder of such coupon when due in accordance
with the provisions of this Indenture.

  (2) The Company may make payment of any Defaulted Interest on the Registered
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.

  (3) Subject to the foregoing provisions of this Section and Section 305, 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.

  Section 308  Persons Deemed Owners.  Prior to due presentment of a Registered
               ---------------------   
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 Registered
Security is registered as the owner of such Security for the purpose of
receiving payment of principal of (and premium or Make-Whole Amount, if any) and
(subject to Sections 305 and 307) interest on, such Registered Security and for
all other purposes whatsoever, whether or not such Registered Security be
overdue, and none of the Company, the Trustee or any agent of the Company or the
Trustee shall be affected by notice to the contrary.

  Title to any Bearer Security and any coupons appertaining thereto shall pass
by delivery. The Company, the Trustee and any agent of the Company or the
Trustee may treat the Holder of any Bearer Security and the Holder of any coupon
as the absolute owner of such Security or coupon for the purpose of receiving
payment thereof or on account thereof and for all other purposes whatsoever,
whether or not such Security or coupon be overdue and none of the Company, the
Trustee or any agent of the Company or the Trustee shall be affected by notice
to the contrary.

  None of the Company, the Trustee, any Paying Agent or the Security Registrar
will have any responsibility or liability for any aspect of the records relating
to or payments made on account of beneficial ownership interests of a Security
in global form or for maintaining, supervising or reviewing any records relating
to such beneficial ownership interests.

  Notwithstanding the foregoing, with respect to any global Security, nothing
herein shall prevent the Company, the Trustee, or any agent of the Company or
the Trustee, from giving effect to any written certification, proxy or other
authorization furnished by any depositary, as a

                                       28
<PAGE>
 
Holder, with respect to such global Security or impair, as between such
depositary and owners of beneficial interests in such global Security, the
operation of customary practices governing the exercise of the rights of such
depositary (or its nominee) as Holder of such global Security.

  Section 309  Cancellation.  All Securities and coupons surrendered for
               ------------
payment, redemption, repayment at the option of the Holder, 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, if not already canceled, shall be promptly canceled by Trustee, and any
such Securities and coupons surrendered directly to the Trustee for any such
purpose 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 cancelled by the Trustee. If the Company shall so
acquire any of the Securities, however, such acquisition shall not operate as a
redemption or satisfaction of the indebtedness represented by such Securities
unless and until the same are surrendered to the Trustee for cancellation. No
Securities shall be authenticated in lieu of or in exchange for any Securities
cancelled as provided in this Section, except as expressly permitted by this
Indenture. Cancelled Securities and coupons held by the Trustee shall be
destroyed by the Trustee and the Trustee shall deliver a certificate of such
destruction to the Company, unless by the Company Order, the Company shall
direct that cancelled Securities and coupons be returned to it.

  Section 310  Computation of Interest.  Except as otherwise specified as
               -----------------------   
contemplated by Section 301 with respect to Securities of any series, interest
on the Securities of each series shall be computed on the basis of a 360-day
year consisting of twelve 30-day months.

  Section 311  CUSIP Number.  The Company in issuing the Securities may use a
               ------------
"CUSIP" number, and if so, the Trustee shall use the CUSIP number in notices of
redemption or exchange as a convenience to Holders, provided that any such
                                                    --------              
notice may state that no representation is made as to the correctness or
accuracy of the CUSIP number printed in the notice or on the Securities, and
that reliance may be placed only on the other identification numbers printed on
the Securities.

  Section 312  Book-Entry Provisions for Global Securities.
               ------------------------------------------- 

  (1) Global Securities initially shall (a) be registered in the name of DTC or
the nominee of DTC and (b) be delivered by the Trustee to DTC or pursuant to
DTC's instructions. Members of, or participants in, DTC ("Agent Members") shall
have no rights under this Indenture with respect to any global Security held on
their behalf by DTC, or the Trustee as its custodian, or under the global
Security, and DTC may be treated by the Company, the Trustee and any agent of
the Company or the Trustee as the absolute owner of the global Security for all
purposes whatsoever. Notwithstanding the foregoing, nothing herein shall prevent
the Company, the Trustee or any agent of the Company or the Trustee from giving
effect to any written certification, proxy or other authorization furnished by
DTC or impair, as between DTC and its Agent Members, the operation of customary
practices governing the exercise of the rights of a Holder of any Security.

  (2) If specified by the Company pursuant to Section 301 with respect to
Securities represented by a global Security, DTC may surrender such global
Security in exchange in whole or in part for Securities of the same series in
definitive registered form on such terms as are

                                       29
<PAGE>
 
acceptable to the Company and DTC. Thereupon, the Company shall execute, and the
Trustee shall authenticate and deliver, without service charge:

       (a) to the Person specified by DTC a new Security or Securities of the
           same series, of any authorized denominations as requested by such
           Person, in an aggregate principal amount equal to and in exchange for
           such Person's beneficial interest in the global Security; and

       (b) to DTC a new global Security in a denomination equal to the
           difference, if any, between the principal amount of the surrendered
           global Security and the aggregate principal amount of Securities
           authenticated and delivered pursuant to clause (i) above.

  (3) Upon the exchange of a global Security for Securities in definitive
registered form in authorized denominations, such global Security shall be
cancelled by the Trustee or an agent of the Company or the Trustee.  Securities
in definitive registered form issued in exchange for a global Security pursuant
to this Section 312 shall be registered in such names and in such authorized
denominations as DTC, pursuant to instructions from its direct or indirect
participants or otherwise, shall instruct the Trustee or an agent of the Company
or the Trustee.  The Trustee or such agent shall deliver such Securities to or
as directed by the Persons in whose names such Securities are so registered.

  (4) The Holder of any global Security may grant proxies and otherwise
authorize any person, including Agent Members and persons that may hold
interests through Agent Members, to take any action which a Holder is entitled
to take under this Indenture or the Securities.


                                  ARTICLE IV

                          SATISFACTION AND DISCHARGE

  Section 401  Satisfaction and Discharge of Indenture.  This Indenture shall
               ---------------------------------------   
upon Company Request cease to be of further effect with respect to any series of
Securities specified in such Company Request (except as to any surviving rights
of registration of transfer or exchange of Securities of such series herein
expressly provided for and any right to receive Additional Amounts, as provided
in Section 1012), and the Trustee, upon receipt of a Company Order, and at the
expense of the Company, shall execute proper instruments acknowledging
satisfaction and discharge of this Indenture as to such series when,

  (1) either

       (a) all Securities of such series theretofore authenticated and delivered
and all coupons, if any, appertaining thereto (other than (i) coupons
appertaining to Bearer Securities surrendered for exchange for Registered
Securities and maturing after such exchange, whose surrender is not required or
has been waived as provided in Section 305, (ii) Securities and coupons of such
series which have been destroyed, lost or stolen and which have been replaced or
paid as provided in Section 306, (iii) coupons appertaining to Securities called
for redemption and maturing after the relevant Redemption Date, whose surrender
has been waived as provided in Section 1106, and (iv) Securities and coupons of
such series for whose payment money has theretofore been deposited in trust or
segregated and held in trust by the Company and thereafter

                                       30
<PAGE>
 
repaid to the Company or discharged from such trust, as provided in Section
1003) have been delivered to the Trustee cancelled or for cancellation; or

       (b) all Securities of such series and, in the case of (i) or (ii) below,
any coupons appertaining thereto not theretofore delivered to the Trustee
cancelled or for cancellation

               (i)     have become due and payable, or

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

               (iii)   if redeemable at the option of the Company, 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 irrevocably
deposited or caused to be deposited with the Trustee as trust funds in trust for
the purpose an amount in the currency or currencies, currency unit or units or
composite currency or currencies in which the Securities of such series are
payable, sufficient to pay and discharge the entire indebtedness on such
Securities and such coupons not theretofore delivered to the Trustee cancelled
or for cancellation, for principal (and premium or Make-Whole Amount, if any)
and interest, and any Additional Amounts with respect thereto, 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 complying with Section 102 and stating that all
conditions precedent herein provided for relating to the satisfaction and
discharge of this Indenture as to such series have been complied with.

  Notwithstanding the satisfaction and discharge of this Indenture, the
obligations of the Company to the Trustee and any predecessor Trustee under
Section 609, the obligations of the Company to any Authenticating Agent under
Section 613 and, if money shall have been deposited with and held by 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 Funds.  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, the coupons 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 premium or Make-Whole Amount, if any), and any interest
and Additional Amounts for whose payment such money has deposited with or
received by the Trustee, but such money need not be segregated from other funds
except to the extent required by law.

                                       31
<PAGE>
 
                                   ARTICLE V

                                   REMEDIES

  Section 501  Events of Default.  "Event of Default," wherever used herein
               -----------------   
with respect to any particular series of Securities, means any one of the
following events (whatever the reason for such Event of Default and whether or
not 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 or any Additional Amounts
payable in respect of any Security of that series or of any coupon appertaining
thereto, when such interest, Additional Amounts or coupon 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 premium or Make-Whole
Amount, if any, on) any Security of that series when it becomes due and payable
at its Maturity; or

  (3) default in the performance, or breach, of any covenant or warranty of the
Company in this Indenture with respect to any Security of that series (other
than a covenant or warranty a default in whose performance or whose breach is
elsewhere in this Section specifically dealt with), 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

  (4) a default under any bond, debenture, note or other evidence of
indebtedness of the Company, or under any mortgage, indenture or other
instrument of the Company (including a default with respect to Securities of any
series other than that series) under which there may be issued or by which there
may be secured any indebtedness of the Company (or by any Subsidiary, the
repayment of which the Company has guaranteed or for which the Company is
directly responsible or liable as obligor or guarantor on a full recourse basis)
whether such indebtedness now exists or shall hereafter be created, which
default shall constitute a failure to pay an aggregate principal amount
exceeding $10,000,000 of such indebtedness when due and payable after the
expiration of any applicable grace period with respect thereto and shall have
resulted in such indebtedness in an aggregate principal amount exceeding
$10,000,000 becoming or being declared due and payable prior to the date on
which it would otherwise have become due and payable, without such indebtedness
having been discharged, or such acceleration having been rescinded or annulled,
within a period of 10 days after there shall have 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 10% in principal amount of the Outstanding Securities
of that series a written notice specifying such default and requiring the
Company to cause such indebtedness to be discharged or cause such acceleration
to be rescinded or annulled and stating that such notice is a "Notice of
Default" hereunder; or

  (5) a default in the deposit of any redemption payment when and as due by the
terms of any Security of any series; or

                                       32
<PAGE>
 
  (6) the Company or any Significant Subsidiary pursuant to or within the
meaning of any Bankruptcy Law:

       (a) commences a voluntary case,

       (b) consents to the entry of an order for relief against it in an
           involuntary case,

       (c) consents to the appointment of a Custodian of it or for all or
           substantially all of its property, or

       (d) makes a general assignment for the benefit of its creditors, or

  (7) a court of competent jurisdiction enters an order or decree under any
Bankruptcy Law that:

       (a) is for relief against the Company or any Significant Subsidiary in an
           involuntary case,

       (b) appoints a Custodian of the Company or any Significant Subsidiary; or

       (c) orders the winding up or liquidation of the affairs of the Company;

       and, in each case the order or decree remains unstayed and in effect for
       90 days; or

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

As used in this Section 501, the term "Bankruptcy Law" means Title 11, U.S. Code
or any similar Federal or State law for the relief of debtors and the term
"Custodian" means any receiver, trustee, assignee, liquidator or other similar
official under any Bankruptcy Law.

  Section 502  Acceleration of Maturity; Rescission and Annulment.  If an event 
               --------------------------------------------------   
of Default with respect to Securities of any series at the time Outstanding
occurs and is continuing, then and 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 (or, if any Securities are Original Issue
Discount Securities or Indexed Securities, such portion of the principal as may
be specified in the terms thereof) and premium (if any) of all the Securities of
that series to be due and payable immediately, by a notice in writing to the
Company (and to the Trustee if given by the Holders), and upon any such
declaration all overdue installments of interest and such principal (and premium
and Make-Whole Amount with respect to such Securities, if any) or specified
portion thereof shall become immediately due and payable.

  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:

                                       33
<PAGE>
 
  (1) the Company has paid or deposited with the Trustee a sum sufficient to pay
in the currency, currency unit or composite currency in which the Securities of
such series are payable (except as otherwise specified pursuant to Section 301
for the Securities of such series):

       (a) all overdue installments of interest on and any Additional Amounts
           payable in respect of all Outstanding Securities of that series and
           any related coupons,

       (b) the principal of (and premium or Make-Whole Amount, if any, on) any
           Outstanding Securities of that series which have become due otherwise
           than by such declaration of acceleration and interest thereon at the
           rate or rates borne by or provided for in such Securities,

       (c) to the extent that payment of such interest is lawful, interest upon
           overdue installments of interest and any Additional Amounts at the
           rate or rates borne by or provided for 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 nonpayment of the principal of (or premium or Make-Whole Amount, if
any) or interest on 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 installment of interest or
Additional Amounts, if any, on any Security of any series and any related coupon
when such interest or Additional Amount 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 or Make-
Whole Amount, if any, on) any Security of any series at its Maturity,

then the Company will, upon demand of the Trustee, pay to the Trustee, for the
benefit of the Holders of such Securities of such series and coupons, the whole
amount then due and payable on such Securities and coupons for principal (and
premium or Make-Whole Amount, if any) and interest and Additional Amount, with
interest upon any overdue principal (and premium or Make-Whole Amount, if any)
and, to the extent that payment of such interest shall be legally enforceable,
upon any overdue installments of interest or Additional Amounts, if any, at the
rate or rates borne by or provided for 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.

                                       34
<PAGE>
 
  If the Company fails to pay such amounts forthwith upon such demand, the
Trustee, in its own name and as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, and
prosecute such proceeding to judgment or final decree, and may enforce the same
against the Company, or any other obligor upon such Securities of such series
and collect the moneys adjudged or decreed to be payable in the manner provided
by law out of the property of the Company or any other obligor upon such
Securities of such series, wherever situated.

  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 and any
related coupons 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 the pendency of any
               --------------------------------                                 
receivership, insolvency, liquidation, bankruptcy, reorganization, arrangement,
adjustment, composition or other judicial proceeding relative to the Company or
any other obligor upon the Securities or the property of the Company or of such
other obligor or their creditors, the Trustee (irrespective of whether the
principal of the Securities of any series shall then be due and payable as
therein expressed or by declaration or otherwise and irrespective of whether the
Trustee shall have made any demand on the Company for the payment of overdue
principal, premium or Make-Whole Amount, if any, or interest) shall be entitled
and empowered, by intervention in such proceeding or otherwise:

               (i)     to file and prove a claim for the whole amount, or such
       lesser amount as may be provided for in the Securities of such series, of
       principal (and premium or Make-Whole Amount, if any) and interest and
       Additional Amounts, if any, owing and unpaid in respect of the Securities
       and to file such other papers or documents as may be necessary or
       advisable in order to have the claims of the Trustee (including any claim
       for the reasonable compensation, expenses, disbursements and advances of
       the Trustee, its agents and counsel) and of the Holders allowed in such
       judicial proceeding, and

               (ii)    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 of Securities of such series and coupons 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 to
it for the reasonable compensation, expenses, disbursements and advances of the
Trustee and any predecessor Trustee, their agents and counsel, and any other
amounts due the Trustee or any predecessor Trustee under Section 607.

  Nothing herein contained shall be deemed to authorize the Trustee to authorize
or consent to or accept or adopt on behalf of any Holder of a Security or coupon
any plan of reorganization, arrangement, adjustment or composition affecting the
Securities or coupons or the rights of any Holder thereof, or to authorize the
Trustee to vote in respect of the claim of any Holder of a Security or coupon in
any such proceeding.

                                       35
<PAGE>
 
  Section 505  Trustee May Enforce Claims Without Possession of Securities or
               --------------------------------------------------------------
Coupons.  All rights of action and claims under this Indenture or any of the
- --------  
Securities or coupons may be prosecuted and enforced by the Trustee without the
possession of any of the Securities or coupons 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 and
coupons 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 premium or Make-Whole Amount, if any) or
interest and any Additional Amounts, upon presentation of the Securities or
coupons, or both, as the case may be, 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 and any predecessor
Trustee under Section 609;

  SECOND:  To the payment of the amounts then due and unpaid upon the Securities
and coupons for principal (and premium or Make-Whole Amount, if any) and
interest and any Additional Amounts payable, 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 aggregate amounts due and payable on such
Securities and coupons for principal (and premium or Make-Whole Amount, if any),
interest and Additional Amounts, respectively; and

  THIRD:  To the payment of the remainder, if any, to the Company.

  Section 507  Limitation on Suits.  No Holder of any Security of any series
               -------------------   
or any related coupon 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 indemnity reasonably
satisfactory to the Trustee against the costs, expenses (including expenses of
counsel) 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

                                       36
<PAGE>
 
  (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 such
Holders.

  Section 508  Unconditional Right of Holders to Receive Principal, Premium or
               ---------------------------------------------------------------
Make-Whole Amount, if any, Interest and Additional Amounts.  Notwithstanding any
- ----------------------------------------------------------                      
other provision in this Indenture, the Holder of any Security or coupon shall
have the right which is absolute and unconditional to receive payment of the
principal of (and premium or Make-Whole Amount, if any) and (subject to Sections
305 and 307) interest on, and any Additional Amounts in respect of, such
Security or payment of such coupon on the respective due dates expressed in such
Security or coupon (or, in the case of redemption, on the Redemption Date) 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 of a Security or coupon 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, the Company, the Trustee and the
Holders of Securities and coupons shall, subject to any determination in such
proceeding, 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 or coupons in the last paragraph of Section 306, no right or
remedy herein conferred upon or reserved to the Trustee or to the Holders of
Securities or coupons 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 Security or coupon 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 of Securities or coupons may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders of Securities
or coupons, as the case may be.

  Section 512  Control by Holders of Securities.  The Holders of a majority in
               --------------------------------   
principal amount of the Outstanding Securities of any series shall have the
right to direct the time, method

                                       37
<PAGE>
 
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,

  (2) the Trustee may take any other action deemed proper by the Trustee which
is not inconsistent with such direction, and

  (3) the Trustee shall have the right to decline to follow any such direction
if the Trustee in good faith shall, by a Responsible Officer or Officers of the
Trustee, determine, and the Trustee shall received a legal opinion stating, that
the proceeding so directed might involve it in personal liability or be unduly
prejudicial to the Holders of Securities of such series not joining therein.

  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 and any related
coupons 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 premium or Make-Whole Amount, if
any) or interest on or Additional Amounts payable in respect of any Security of
such series or any related coupons, or

   (2) in respect of a covenant or provision hereof which under Article IX
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 Event of Default or impair any right consequent thereon.

  Section 514  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.

  Section 515  Undertaking for Costs.  All parties to this Indenture agree,
               ---------------------   
and each Holder of any Security by his acceptance thereof shall be deemed to
have agreed, that any court may in its discretion require, 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 or omitted by it as Trustee, the filing by any
party litigant in such suit of any undertaking to pay the costs of such suit,
and that such court may in its discretion assess reasonable costs, including
reasonable attorneys' fees, against any party litigant in such suit having due
regard to the merits and good faith of the claims or defenses made by such party
litigant; but the provisions of this Section shall not apply to any suit
instituted by the Trustee, to any suit instituted by any Holder, or group of
Holders, holding in

                                       38
<PAGE>
 
the aggregate more than 10% in principal amount of the Outstanding Securities,
or to any suit instituted by any Holder for the enforcement of the payment of
the principal of (or premium or Make-Whole Amount, if any) or interest on any
Security on or after the respective Stated Maturities expressed in such Security
(or, in the case of redemption, on or after the Redemption Date).

                                  ARTICLE VI

                                  THE TRUSTEE

  Section 601  Certain Duties and Responsibilities
               -----------------------------------

  (1) Except during the continuance of an Event of Default,

       (a) the Trustee undertakes to perform such duties, and only such duties,
           as are specifically set forth in this Indenture, and no implied
           covenants or obligations shall be read into this Indenture against
           the Trustee; and

       (b) in the absence of bad faith on its part, the Trustee may conclusively
           rely, as to the truth of the statements and the correctness of the
           opinions expressed therein, upon certificates or opinions furnished
           to the Trustee and conforming to the requirements of this Indenture;
           but in the case of any such certificates or opinions that by any
           provisions hereof are specifically required to be furnished to the
           Trustee, the Trustee shall be under a duty to examine the same to
           determine whether or not they conform to the requirements of this
           Indenture.

  (2) In case an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in their exercise, as a prudent man would
exercise or use under the circumstances in the conduct of his own affairs.

  (3) No provision of this Indenture shall be construed to relieve the Trustee
from liability for its own negligent action, its own negligent failure to act,
or its own willful misconduct, except that

       (a) this Subsection shall not be construed to limit the effect of
           Subsection (1) of this Section 601;

       (b) the Trustee shall not be liable for any error of judgment made in
           good faith by a Responsible Officer, unless it shall be proved that
           the Trustee was negligent in ascertaining the pertinent facts;

       (c) the Trustee shall not be liable with respect to any action taken or
           omitted to be taken by it in good faith in accordance with the
           direction of the Holders of a majority in principal amount of the
           Outstanding Securities of any series, relating to the time, method
           and place of conducting any proceeding for any remedy available to
           the Trustee, or exercising any trust or power conferred upon the
           Trustee, under this Indenture with respect to the Securities of such
           series; and

                                       39
<PAGE>
 
       (d) 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.

  (4) 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
601.

  Section 602  Notice of Defaults.  Within 90 days after the occurrence of any
               ------------------   
default hereunder with respect to the Securities of any series, the Trustee
shall transmit in the manner and to the extent provided in TIA Section 313(c),
notice of such default hereunder known to the Trustee, unless such default shall
have been cured or waived; provided, however, that, except in the case of a
                           --------  -------
default in the payment of the principal of (or premium or Make-Whole Amount, if
any) or interest on or any Additional Amounts with respect to any Security of
such series, or in the payment of any sinking or purchase fund installment with
respect to the Securities of such series, the Trustee shall be protected in
withholding such notice if and so long as the board of directors, the executive
committee, or a trust committee of directors and/or Responsible Officers of the
Trustee in good faith determine that the withholding of such notice is in the
interests of the Holders of the Securities and coupons of such series; and
provided further that in the case of any default or breach of the character
- -------- -------                                                           
specified in Section 501(3) with respect to the Securities and coupons of such
series, no such notice to Holders shall be given until at least 60 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 the Securities of such series.

  Section 603  Certain Rights of Trustee.  Subject to the provisions of TIA
               -------------------------   
Section 315(a) through 315(d):

  (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, coupon 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 (other than
delivery of any Security to the Trustee for authentication and delivery pursuant
to Section 303, which shall be sufficiently evidenced as provided therein) and
any resolution of the Board of Directors may 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;

                                       40
<PAGE>
 
  (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 of Securities of any series or any related coupons pursuant to this
Indenture, unless such Holders shall have offered to the Trustee security or
indemnity reasonably satisfactory to the Trustee 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,
coupon or other paper or documents, 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 books, records and premises of
the Company personally or by agent or attorney;

  (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; and

  (8) the Trustee shall not be liable for any action taken, suffered or omitted
by it in good faith and reasonably believed by it to be authorized or within the
discretion or rights or powers conferred upon it by this Indenture.

  The Trustee shall not be required 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.

  Section 604  Not Responsible for Recitals or Issuance of Securities.  The
               ------------------------------------------------------   
recitals contained herein and in the Securities, except the Trustee's
certificate of authentication, and in any coupons 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 or coupons, except that the Trustee represents that it is duly
authorized to execute and deliver this Indenture, authenticate the Securities
and perform its obligations hereunder. Neither the Trustee nor any
Authenticating Agent shall be accountable for the use or application by the
Company of Securities or the proceeds thereof.

  Sectin 605  May Hold Securities.  The Trustee, any Paying Agent, Security
              -------------------   
Registrar, Authenticating Agent or any other agent of the Company, in its
individual or any other capacity, may become the owner or pledgee of Securities
and coupons and, subject to TIA Sections 310(b) and 311, may otherwise deal with
the Company with the same rights it would have if it were not the Trustee,
Paying Agent, Security Registrar, Authenticating Agent or such other agent.

  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.

                                       41
<PAGE>
 
  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 each of the
Trustee and any predecessor Trustee upon its request for all reasonable
expenses, disbursements and advances incurred or made by the Trustee and any
Predecessor 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 gross negligence or bad faith; and

  (3) to indemnify each of the Trustee and any predecessor Trustee for, and to
hold it harmless against, any loss, liability or expense incurred without gross
negligence or bad faith on its own 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.

All such payments and reimbursements shall be made with interest at the rate
borne by the Securities.

  When the Trustee incurs expenses or renders services in connection with an
Event of Default specified in Section 501(5) or Section 501(6), the expenses
(including the reasonable charges and expenses of its counsel) and the
compensation for the services are intended to constitute expenses of
administration under any applicable Federal or state bankruptcy, insolvency or
other similar law.

  As security for the performance of the obligations of the Company under this
Section, the Trustee shall have a lien prior to the Securities upon all property
and funds held or collected by the Trustee as such, except funds held in trust
for the payment of principal of (or premium, if any) or interest on particular
Securities or any coupons.

  The provisions of this Section shall survive the satisfaction and discharge of
this Indenture.

  Section 608  Disqualification:  Conflicting Interests.  The Trustee shall
               ----------------------------------------   
comply with the terms of Section 310(b) of the TIA.

  Section 609  Corporate Trustee Required; Eligibility.  There shall at all
               ---------------------------------------   
times be a Trustee hereunder which shall be eligible to act as Trustee under TIA
Section 310(a) and shall have a combined capital and surplus of at least
$50,000,000. If such corporation publishes reports of condition at least
annually, pursuant to law or the requirements of any Federal, State, Territorial
or District of Columbia supervising or examining authority, then for the
purposes of this Section, the combined capital and surplus of such corporation
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 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.

                                       42
<PAGE>
 
  Section 610  Resignation and Removal; Appointment of Successor.
               ------------------------------------------------- 

       (a) 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.

       (b) 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 an
instrument of acceptance by a successor Trustee 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.

       (c) 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 the Company.

       (d) If at any time:

               (i)     the Trustee shall fail to comply with the provisions of
       TIA Section 310(b) after written request therefor by the Company or by
       any Holder of a Security who has been a bona fide Holder of a Security
       for at least six months, or

               (ii)    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 Holder of a Security who has been a bona fide Holder of a Security
       for at least six months, or

               (iii)   the Trustee shall become incapable of acting or shall be
       adjudged a bankruptcy 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 of liquidation,

       then, in any such case, (x) the Company by or pursuant to a Board
Resolution may remove the Trustee and appoint a successor Trustee with respect
to all Securities, or (y) subject to TIA Section 315(e), any Holder of a
Security 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.

       (e) 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 or pursuant to
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). 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, 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 of Securities

                                       43
<PAGE>
 
and accepted appointment in the manner hereinafter provided, any Holder of a
Security 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 Securities of such series.

       (f) 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 in the manner
provided for notices to the Holders of Securities 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.
               -------------------------------------- 

       (a) In case of the appointment hereunder of a successor Trustee with
respect to all Securities, every such successor Trustee shall execute,
acknowledge and deliver to the Company and 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 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, subject nevertheless to its lien,
if any, provided for in Section 607.

       (b) 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,
pursuant to Article IX hereof, 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 make 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, 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 with respect to the Securities of that or those
series to which the appointment

                                       44
<PAGE>
 
of such successor Trustee relates, subject nevertheless to its lien, if any,
provided for in Section 607.

       (c) Upon request of any such successor Trustee, the Company shall execute
any and all instruments for the purpose of more fully and certainly vesting in
and confirming to such successor Trustee all such rights, powers and trusts
referred to in paragraph (a) or (b) of this Section, as the case may be.

       (d) 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 of 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 or coupons 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 or coupons so authenticated with
the same effect as if such successor Trustee had itself authenticated such
Securities or coupons.  In case any Securities or coupons shall not have been
authenticated by such predecessor Trustee, any such successor Trustee may
authenticate and deliver such Securities or coupons, in either its own name or
that of its predecessor Trustee, with the full force and effect which this
Indenture provides for the certificate of authentication of the Trustee.

  Section 613  Appointment of Authenticating Agent.  At any time when any of the
               -----------------------------------                              
Securities remain Outstanding, 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 exchange, registration of transfer or partial redemption or
repayment thereof, 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.  Any such appointment shall be
evidenced by an instrument in writing signed by a Responsible Officer of the
Trustee, a copy of which instrument shall be promptly furnished to the Company.
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 bank or trust company or corporation organized and doing business and in
good standing under the laws of the United States of America or of any State or
the District of Columbia, authorized under such laws to act as Authenticating
Agent, having a combined capital and surplus of not less than $50,000,000 and
subject to supervision or examination by Federal, State, or District of Columbia
authorities.  If such Authenticating Agent publishes reports of condition at
least annually, pursuant to law or the requirements of the aforesaid 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.  In case 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.

                                       45
<PAGE>
 
  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 further act
on the part of the Trustee or the Authenticating Agent.

  An Authenticating Agent for any series of Securities may at any time resign by
giving written notice of resignation to the Trustee for such series and to the
Company.  The Trustee for any series of Securities may at any time terminate the
agency of an Authenticating Agent by giving written notice of termination to
such Authenticating Agent and 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 for such series may appoint a successor
Authenticating Agent which shall be acceptable to the Company and shall give
notice of such appointment to all Holders of Securities of the series with
respect to which such Authenticating Agent will serve in the manner set forth in
Section 106.  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 herein.  No successor Authenticating Agent shall be
appointed unless eligible under the provisions of this Section.

  The Company agrees to pay to each Authenticating Agent from time to time
reasonable compensation including reimbursement of its reasonable expenses for
its services under this Section.

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

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


                                       THE CHASE MANHATTAN BANK, as Trustee


                                       By:
                                          --------------------------------------
                                             as Authenticating Agent

                                       By:
                                          --------------------------------------
                                             Authorized Signatory


                                  ARTICLE VII

               HOLDERS LISTS AND REPORTS BY TRUSTEE AND COMPANY

  Section 701.  Preservation of Information; Communications to Holders.
                ------------------------------------------------------ 

  (1) 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 for each series as provided in Section 704 and the
names and addresses of Holders received by the Trustee for each series in the
capacity of Security Registrar if the Trustee is then acting in such

                                       46
<PAGE>
 
capacity. The Trustee may destroy any list furnished to it as provided in
Section 704 upon receipt of a new list so furnished.

  (2) If three or more Holders of Securities of any series (hereinafter referred
to as "applicants") apply in writing to the Trustee, and furnish to the Trustee
reasonable proof that each such applicant has owned a Security of such series
for a period of at least six months preceding the date of such application, and
such application states that the applicants desire to communicate with other
Holders of Securities of such series with respect to their rights under this
Indenture or under the Securities and is accompanied by a copy of the form of
proxy or other communication that such applicants propose to transmit, then the
Trustee shall, within five (5) business days after the receipt of such
application, at its election, either

       (a) afford such applicants access to the information preserved at the
           time by the Trustee in accordance with Section 701(1), or

       (b) inform such applicants as to the approximate number of Holders of
           such series whose names and addresses appear in the information
           preserved at the time by the Trustee in accordance with Section
           701(1), and as to the approximate cost of mailing to such Holders the
           form of proxy or other communication, if any, specified in such
           application.

  If the Trustee shall elect not to afford such applicants access to such
information, the Trustee shall, upon the written request of such applicants,
mail to each Holder whose name and address appears in the information preserved
at the time by the Trustee in accordance with Section 701(1), a copy of the form
of proxy or other communication that is specified in such request, with
reasonable promptness after a tender to the Trustee of the material to be mailed
and of payment, or provision for the payment, of the reasonable expenses of
mailing, unless within five days after such tender the Trustee shall mail to
such applicants and file with the Commission, together with a copy of the
material to be mailed, a written statement to the effect, that in the opinion of
the Trustee, such mailing would be  contrary to the best interests of the
Holders or would be in violation of applicable law.  Such written statement
shall specify the basis of such opinion.  If the Commission, after opportunity
for a hearing upon the objections specified in the written statement so filed,
shall enter an order refusing to sustain any of such objections or if, after the
entry or an order sustaining one or more of such objections, the Commission
shall find, after notice and opportunity for hearing, that all the objections so
sustained have been met and shall enter an order so declaring, the Trustee shall
mail copies of such material to all such Holders with reasonable promptness
after the entry of such order and the renewal of such tender; otherwise the
Trustee shall be relieved of any obligation or duty to such applicants
respecting their application.

  (3) Every Holder of Securities or coupons, by receiving and holding the same,
agrees with the Company and the Trustee that neither the Company nor the Trustee
nor any Authenticating Agent nor any Paying Agent nor any Security Registrar
shall be held accountable by reason of the disclosure of any information as to
the names and addresses of the Holders of Securities in accordance with TIA
Section 312, regardless of the source from which such information was derived,
and that the Trustee shall not be held accountable by reason of mailing any
material pursuant to a request made under TIA Section 312(b).

  Section 702  Reports by Trustee.
               ------------------ 

  (1) Within 60 days after March 15 of each year commencing with the first March
15 after the first issuance of Securities pursuant to this Indenture, the
Trustee shall transmit by mail

                                       47
<PAGE>
 
to all Holders of Securities as provided in TIA Section 313(c) a brief report
dated as of such March 15 in accordance with, and to the extent required by TIA
Section 313(a).

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

  Section 703  Reports by Company.  The Company will:
               ------------------                    

  (1) file with the Trustee, within 15 days after the Company is required to
file the same with the Commission, copies of the annual reports and of the
information, documents and other reports (or copies of such portions of any of
the foregoing as the Commission may from time to time by rules and regulations
prescribe) which the Company may be required to file with the Commission
pursuant to Section 13 or Section 15(d) of the Exchange Act; or if the Company
is not required to file information, documents or reports pursuant to either of
such Sections, then it will file with the Trustee and the Commission, in
accordance with rules and regulations prescribed from time to time by the
Commission, such of the supplementary and periodic information, documents and
reports which may be required pursuant to Section 13 of the Exchange Act in
respect of a security listed and registered on a national securities exchange as
may be prescribed from time to time in such rules and regulations;

  (2) file with the Trustee and the Commission, in accordance with rules and
regulations prescribed from time to time by the Commission, such additional
information, documents and reports with respect to compliance by the Company
with the conditions and covenants of this Indenture as may be required from time
to time by such rules and regulations; and

  (3) transmit by mail to the Holders of Securities, within 30 days after the
filing thereof with the Trustee, in the manner and to the extent provided in TIA
Section 313(c), such summaries of any information, documents and reports
required to be filed by the Company pursuant to paragraphs (1) and (2) of this
Section as may be required by rules and regulations prescribed from time to time
by the Commission.

  Section 704  The 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 for
interest for each series of Securities, a list, in such form as the Trustee may
reasonably require, of the names and addresses of the Holders of Registered
Securities of such series as of such Regular Record Date, or if there is no
Regular Record Date for interest for such series of Securities, semi-annually,
upon such dates as are set forth in the Board Resolution or indenture
supplemental hereto authorizing such series, 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, however, that, so long as the Trustee is the Security
           --------  -------                                              
Registrar, no such list shall be required to be furnished.

                                       48
<PAGE>
 
                                 ARTICLE VIII

               CONSOLIDATION, MERGER, SALE, LEASE OR CONVEYANCE

  Sectin 801  Consolidation and Mergers of Company and Sales, Leases and
              ----------------------------------------------------------
Conveyances Permitted Subject to Certain Conditions.  The Company may
- ---------------------------------------------------
consolidate with, or sell, lease or convey all or substantially all of its
assets to, or merge with or into any other entity, provided that in any such
case, (1) either the Company shall be the continuing entity, or the successor
entity shall be an entity organized and existing under the laws of the United
States or a State thereof and such successor entity shall expressly assume by
supplemental indenture complying with Article IX hereof, in form satisfactory to
the Trustee, executed and delivered to the Trustee by such entity the due and
punctual payment of the principal of (and premium or Make-Whole Amount, if any)
and any interest (including all Additional Amounts, if any, payable pursuant to
Section 1012) on all of the Securities, according to their tenor, and the due
and punctual performance and observance of all of the covenants and conditions
of this Indenture to be performed by the Company and (2) immediately after
giving effect to such transaction and treating any indebtedness which becomes an
obligation of the Company or any Subsidiary as a result thereof as having been
incurred by the Company or such Subsidiary at the time or such transaction, no
Event of Default, and no event which, after notice or the lapse of time, or
both, would become an Event of Default, shall have occurred and be continuing.

  Section 802  Rights and Duties of Successor Entity.  In case of any such
               -------------------------------------                      
consolidation, merger, sale, lease or conveyance and upon any such assumption of
the Company's assets by the successor entity, such successor entity 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 it had been named
as the Company herein, and the predecessor entity, except in the event of a
lease, shall be relieved of any further obligation under this Indenture and the
Securities.  Such successor entity thereupon may cause to be signed, and may
issue either in its own name or in the name of the Company, any or all of the
Securities issuable hereunder which theretofore shall not have been signed by
the Company and delivered to the Trustee; and, upon the order of such successor
entity, instead of the Company, and subject to all the terms, conditions and
limitations in this Indenture prescribed, the Trustee shall authenticate and
shall deliver any Securities which previously shall have been signed and
delivered by the officers of the Company to the Trustee for authentication, and
any Securities which such successor entity thereafter shall cause to be signed
and delivered to the Trustee for that purpose.  All the Securities so issued
shall in all respects have the same legal rank and benefit under this Indenture
as the Securities theretofore or thereafter issued in accordance with the terms
of this Indenture as though all of such Securities had been issued at the date
of the execution hereof.

  In case of any such consolidation, merger, sale, lease or conveyance, such
changes in phraseology and form (but not in substance) may be made in the
Securities thereafter to be issued as may be appropriate.

  Section 803  Officers' Certificate and Opinion of Counsel.  Any 
               --------------------------------------------   
consolidation, merger, sale, lease or conveyance permitted under Section 801 is
also subject to the condition that the Trustee receive an Officers' Certificate
and an Opinion of Counsel, each complying with Section 102 and stating that any
such consolidation, merger, sale, lease or conveyance, and the assumption by any
successor entity, is authorized or permitted by the provisions of this Article
and that all conditions precedent herein provided for relating to such
transaction have been complied with.

                                       49
<PAGE>
 
  Section 804  Limitation on Lease of Assets as Entirety.  The Company shall
               -----------------------------------------   
not lease its assets substantially as an entirety to any Person.


                                  ARTICLE IX

                            SUPPLEMENTAL INDENTURES

  Section 901  Supplemental Indentures Without Consent of Holders.  Without
               --------------------------------------------------   
the consent of any Holders of Securities or coupons, the Company, when
authorized by or pursuant to 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 corporation to the Company and the
assumption by any such successor of the covenants of the Company herein and in
the Securities contained; 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 powers 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 Events of Default are to be for the
benefit of less than all series of Securities, stating that such Events of
Default are expressly being included solely for the benefit of such series);
provided, however, that in respect of any such additional Events of Default such
- --------  -------                                                               
supplemental indenture may provide for a particular period of grace after
default (which period may be shorter or longer than that allowed in the case of
other defaults) or may provide for an immediate enforcement upon such default or
may limit the remedies available to the Trustee upon such default or may limit
the right to waive such default to the Holders of a majority in aggregate
principal amount of that or those series of Securities to which such additional
Events of Default apply; or

  (4) to add to or change any of the provisions of this Indenture to provide
that Bearer Securities may be registrable as to principal, to change or
eliminate any restrictions on the payment of principal of or any premium or
interest on Bearer Securities, to permit Bearer Securities to be issued in
exchange for Registered Securities, to permit Bearer Securities to be issued in
exchange for Bearer Securities of other authorized denominations or to permit or
facilitate the issuance of Securities in uncertificated form, provided that any
such action shall not adversely affect the interests of the Holders of
Securities of any series or any related coupons in any material respect; or

  (5) to change or eliminate any of the provisions of this Indenture, provided
that any such change or elimination shall become effective only when there are
no Securities Outstanding of any series created prior to the execution of such
supplemental indenture which is entitled to the benefit of such provision; or

  (6) to secure the Securities; or

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

                                       50
<PAGE>
 
  (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; or

  (9) 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 which shall not be inconsistent with the provisions of this Indenture,
provided such other provisions shall not adversely affect the interests of the
- --------                                                                      
Holders of Securities of any series or any related coupons in any material
respect; or

  (10) to supplement any of the provisions of this Indenture to such extent as
shall be necessary to permit or facilitate the defeasance and discharge of any
series of Securities pursuant to Section 401, 1302 and 1303; provided that any
                                                             --------
such action shall not adversely affect the interests of the Holders of
Securities of such series and any related coupons 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 not less than a majority in principal amount of all
Outstanding Securities affected by such supplemental indenture, by Act of said
Holders delivered to the Company and the Trustee, the Company, when authorized
by or pursuant to 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 and any related coupons 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 premium or Make-Whole
Amount, if any, on) or any installment of principal of or interest on, and
Security, or reduce the principal amount thereof or the rate or amount of
interest thereon or any Additional Amounts payable in respect thereof, or any
premium payable upon the redemption thereof, or change any obligation of the
Company to pay Additional Amounts pursuant to Section 1012 (except as
contemplated by Section 801(1) and permitted by Section 901(1)), or reduce the
amount of the principal of an Original Issue Discount Security or Make-Whole
Amount that would be due and payable upon a declaration of acceleration of the
Maturity thereof pursuant to Section 502 or the amount thereof provable in
bankruptcy pursuant to Section 504, or adversely affect any right of repayment
at the option of the Holder of any Security, or change any Place of Payment
where, or the currency or currencies, currency unit or units or composite
currency or currencies in which any Security or any premium or Make-Whole Amount
or the 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 or repayment at the option of the Holder, on or after
the Redemption Date or the Repayment Date, as the case may be), 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 with
respect to such series (of compliance with certain provisions of this Indenture
or certain defaults hereunder and their consequences) provided for in this
Indenture, or reduce the requirements of Section 1504 for quorum or voting, or

  (3) modify any of the provisions of this Section, Section 513 or Section 1013,
except to increase the required percentage to effect such action or to provide
that certain other

                                       51
<PAGE>
 
provisions of this Indenture cannot be modified or waived without the consent of
the Holder of each Outstanding Security affected thereby.

  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.

  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.

  Section 903  Execution of Supplemental Indentures.  In executing, or
               ------------------------------------   
accepting the additional trusts created by, any supplemental indenture permitted
by this Article or the modification thereby of the trusts created by this
Indenture, the Trustee shall be entitled to receive, and (subject to Section
601) shall be fully protected in relying upon, an Opinion of Counsel complying
with Section 102 and 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 or 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 and of any coupon appertaining
thereto 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 as then in effect.

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

  Section 907  Notice of Supplemental Indentures.  Promptly after the 
               ---------------------------------           
execution by the Company and the Trustee of any supplemental indenture pursuant
to the provisions of Section 902, the Company shall give notice thereof to the
Holders of each Outstanding Security affected, in the manner provided for in
Section 106, setting forth in general terms the substance of such supplemental
indenture.


                                   ARTICLE X

                                   COVENANTS

  Section 1001  Payment of Principal, Premium or Make-Whole Amount, if any,
                -----------------------------------------------------------
Interest and Additional Amounts.  The Company covenants and agrees for the
- -------------------------------
benefit of the Holders of

                                       52
<PAGE>
 
each series of Securities that it will duly and punctually pay the principal of
(and premium or Make-Whole Amount, if any) and interest on and any Additional
Amounts payable in respect of the Securities of that series in accordance with
the terms of such series of Securities, any coupons appertaining thereto and
this Indenture. Unless otherwise specified as contemplated by Section 301 with
respect to any series of Securities, any interest due on and any Additional
Amounts payable in respect of Bearer Securities on or before Maturity, other
than Additional Amounts, if any, payable as provided in Section 1012 in respect
of principal of (or premium or Make-Whole Amount, if any, on) such a Security,
shall be payable only upon presentation and surrender of the several coupons for
such interest installments as are evidenced thereby as they severally mature.
Unless otherwise specified with respect to Securities of any series pursuant to
Section 301, at the option of the Company, all payments of principal may be paid
by check to the registered Holder of the Registered Security or other person
entitled thereto against surrender of such Security.

  Section 1002  Maintenance of Office or Agency.  If Securities of a series are
                -------------------------------   
issuable only as Registered Securities, the Company shall 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 or conversion,
surrendered for registration of transfer or exchange 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 hereby initially appoints the Trustee
as its office or agency for said purposes. If Securities of a series are
issuable as Bearer Securities, the Company will maintain : (A) in the Borough of
Manhattan, The City of New York, an office or agency where any Registered
Securities of that series may be presented or surrendered for payment or
conversion, where any Registered Securities of that series may be surrendered
for registration of transfer, where Securities of that series may be surrendered
for exchange, where notices and demands to or upon the Company in respect of the
Securities of that series and this Indenture may be served and where Bearer
Securities of that series and related coupons may be presented or surrendered
for payment or conversion in the circumstances described in the following
paragraph (and not otherwise); (B) subject to any laws or regulations applicable
thereto, in a Place of Payment for that series which is located outside the
United States, an office or agency where Securities of that series and related
coupons may be presented and surrendered for payment (including payment of any
Additional Amounts payable on Securities of that series pursuant to Section
1012) or conversion; provided, however, that if the Securities of that series
                     --------  -------                                       
are listed on the Luxembourg Stock Exchange or any other stock exchange located
outside the United States and such stock exchanges shall so require, the Company
will maintain a Paying Agent for the Securities of that series in Luxembourg or
any other required city located outside the United States, as the case may be,
so long as the Securities of that series are listed on such exchange; and (C)
subject to any laws or regulations applicable thereto, in a Place of Payment for
that series located outside the United States, an office or agency where any
Registered Securities of that series may be surrendered for registration of
transfer, where Securities of that series may be surrendered for exchange 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 each 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, except that
Bearer Securities of that series and the related coupons may be presented and
surrendered for payment (including payment of any Additional Amounts payable on
Bearer Securities of that series pursuant to Section 1012) or conversion at the
offices specified in the Security, in London, England, and the Company hereby
appoints the same as its agent to receive such respective presentations,
surrenders, notices and demands, and the Company hereby appoints the Trustee its
agent to receive all such presentations, surrenders, notices and demands.

                                       53
<PAGE>
 
  Unless otherwise specified with respect to any Securities pursuant to Section
301, no payment of principal, premium, Make-Whole Amount or interest on or
Additional Amounts in respect of Bearer Securities shall be made at any office
or agency of the Company in the United States or by check mailed to any address
in the United States or by transfer to an account maintained with a bank located
in the United States; provided, however, that, if the Securities of a series are
                      --------  -------                                         
payable in Dollars, payment of principal of and any premium, Make-Whole Amount
and interest on any Bearer Security (including any Additional Amounts payable on
Securities of such series pursuant to Section 1012) shall be made at the office
of the Company's Paying Agent in the Borough of Manhattan, The City of New York,
if (but only if) payment in Dollars of the full amount of such principal,
premium, or Make-Whole Amount, interest or Additional Amounts, as the case may
be, at all offices or agencies outside the United State maintained for the
purpose by the Company in accordance with this Indenture, is illegal or
effectively precluded by exchange controls or other similar restrictions.

  The Company may 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 of 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 accordance with the requirements set forth above 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.  Unless otherwise specified with
respect to any Securities pursuant to Section 301 with respect to a series of
Securities, the Company hereby designates as a Place of Payment for each series
of Securities the office or agency of the Company in the Borough of Manhattan,
The City of New York, and initially appoints the Trustee at its Corporate Trust
Office as Paying Agent in such city and as its agent to receive all such
presentations, surrenders, notices and demands.

  Unless otherwise specified with respect to any Securities pursuant to Section
301, if and so long as the Securities of any series (i) are denominated in a
Foreign Currency or (ii) may be payable in a Foreign Currency, or so long as it
is required under any other provision of the Indenture, then the Company will
maintain with respect to each such series of Securities, or as so required, at
least one exchange rate agent.

  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 any Securities and any related coupons, it will, on or before each due date
of the principal of (and premium or Make-Whole Amount, if any), or interest on
or Additional Amounts in respect of, any of the Securities of that series,
segregate and hold in trust for the benefit of the Persons entitled thereto a
sum in the currency or currencies, currency unit or units or composite currency
or currencies in which the Securities of such series are payable (except as
otherwise specified pursuant to Section 301 for the Securities of such series)
sufficient to pay the principal (and premium or Make-Whole Amount, if any) or
interest or Additional Amounts 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 and any related coupons, it will, before each due date of the
principal of (and premium or Make-Whole Amount, if any), or interest on or
Additional Amounts in respect of, any Securities of that series, deposit with a
Paying Agent a sum (in the currency or currencies, currency unit or units or
composite currency or currencies described in the preceding paragraph)
sufficient to pay the principal (and premium or Make-Whole Amount, if any) or
interest or Additional Amounts, so becoming due, such sum to be held in trust
for the benefit of the Persons entitled to such principal, Make-Whole Amount,
premium or interest or Additional Amounts and (unless such

                                       54
<PAGE>
 
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 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) hold all sums held by it for the payment of principal of (and premium or
Make-Whole Amount, if any) or interest on or Additional Amounts in respect of
Securities in trust for the benefit of the Persons entitled thereto until such
sums shall be paid to such Persons or otherwise disposed of as herein provided;

  (2) give the Trustee notice of any default by the Company (or any other
obligor upon the Securities) in the making of any such payment of principal (and
premium or Make-Whole Amount, if any) or interest or Additional Amounts; and

  (3) at any time during the continuance of any such default, upon the written
request of the Trustee, forthwith pay to the Trustee all sums so held in trust
by such Paying Agent.

  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 sums.

  Except as otherwise provided in the Securities of any series, 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 (and premium or Make-Whole Amount, if
any) or interest on, or any Additional Amounts in respect of, any Security of
any series and remaining unclaimed for two years after such principal (and
premium or Make-Whole Amount, if any), interest or Additional Amounts has become
due and payable shall be paid to the Company upon 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 of such principal of (and premium or Make-Whole Amount, if
any) or interest on, or any Additional Amounts in respect of, any Security,
without interest thereon, 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 an Authorized Newspaper in
each Place of Payment or mail to each such Holder or both, 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 or mailing, any
unclaimed balance of such money then remaining will be repaid to the Company.

  Section 1004  [Omitted].

  Section 1005  [Omitted].

  Section 1006  Existence.  Subject to Article VIII, the Company will do or 
                ---------                                                   
cause to be done all things necessary to preserve and keep in full force and
effect its existence, rights and franchises; provided, however, that the Company
                                             --------  -------           
shall not be required to preserve any right or franchise if the Board of
Directors shall determine that the preservation thereof is no longer

                                       55
<PAGE>
 
desirable in the conduct of the business of the Company and that the loss
thereof is not disadvantageous in any material respect to the Holders.

  Section 1007  Maintenance of Properties.  The Company will cause all of its
                -------------------------   
properties used or useful in the conduct of its business or the business of any
Subsidiary 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 in the judgment of the Company may be necessary so that the business
carried on in connection therewith may be promptly and advantageously conducted
at all times; provided, however, that nothing in this Section shall prevent the
              --------  -------
Company or any Subsidiary from selling or otherwise disposing for value its
properties in the ordinary course of its business and in a manner that is not 
disadvantageous in any material respect to the Holders.

  Section 1008  Insurance.  The Company will, and will cause each of its
                ---------   
Subsidiaries to, keep all of its insurable properties insured against loss or
damage at least equal to their then full insurable value with financially sound
and reputable insurers.

  Section 1009  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 it or any Subsidiary or upon the income, profits or property of the
Company or any Subsidiary, 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 or any Subsidiary; 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 whose amount, applicability or validity is being
contested in good faith by appropriate proceedings.

  Section 1010  Provision of Financial Information.  Whether or not the
                ----------------------------------  
Company is subject to Section 13 or 15(d) of the Exchange Act, the Company will,
to the extent permitted under the Exchange Act, file with the Commission the
annual reports, quarterly reports and other documents which the Company would
have been required to file with the Commission pursuant to such Section 13 or
15(d) (the "Financial Statements") if the Company were so subject, such
documents to be filed with the Commission on or prior to the respective dates
(the "Required Filing Dates") by which the Company would have been required so
to file such documents if the Company were so subject.

  The Company will also in any event (x) within 15 days of each Required Filing
Date (i) transmit by mail to all Holders, as their names and addresses appear in
the Security Register, without cost to such Holders copies of the annual reports
and quarterly reports which the Company would have been required to file with
the Commission pursuant to Section 13 or 15(d) of the Exchange Act if the
Company were subject to such Sections, and (ii) file with the Trustee copies of
the annual reports, quarterly reports and other documents which the Company
would have been required to file with the Commission pursuant to Section 13 or
15(d) of the Exchange Act if the Company were subject to such Sections and (y)
if filing such documents by the Company with the Commission is not permitted
under the Exchange Act, promptly upon written request and payment of the
reasonable cost of duplication and delivery, supply copies of such documents to
any prospective Holder.

  Section 1011  Statement as to Compliance.  The Company will deliver to the
                --------------------------   
Trustee, within 120 days after the end of each fiscal year (which on the date
hereof is December 31), a written certificate signed by the principal executive
officer, principal financial officer or principal accounting officer as to his
or her knowledge of the Company's compliance with all conditions and covenants
under this Indenture and, in the event of any noncompliance, specifying such
noncompliance and the nature and status thereof. For purposes of this Section
1011, such

                                       56
<PAGE>
 
compliance shall be determined without regard to any period of grace or
requirement of notice under this Indenture.

  Section 1012  Additional Amounts.  If any Securities of a series provide for
                ------------------   
the payment of Additional Amounts, the Company will pay to the Holder of any
Security of such series or any coupon appertaining thereto Additional Amounts as
may be specified as contemplated by Section 301.  Whenever in this Indenture
there is mentioned, in any context except in the case of Section 502(1), the
payment of the principal of or any premium or interest on, or in respect of, any
Security of any series or payment of any related coupon or the net proceeds
received on the sale or exchange of any Security of any series, such mention
shall be deemed to include mention of the payment of Additional Amounts provided
by the terms of such series established pursuant to Section 301 to the extent
that, in such context, Additional Amounts are, were or would be payable in
respect thereof pursuant to such terms and express mention of the payment of
Additional Amounts (if applicable) in any provision hereof shall not be
construed as excluding Additional Amounts in those provisions hereof where such
express mention is not made.

  Except as otherwise specified as contemplated by Section 301, if the
Securities of a series provide for the payment of Additional Amounts, at least
10 days prior to the first Interest Payment Date with respect to that series of
Securities (or if the Securities of that series will not bear interest prior to
Maturity, the first day on which a payment of principal and any premium, if any,
is made), and at least 10 days prior to each date of payment of principal and
any premium or interest if there has been any change with respect to the matters
set forth in the below-mentioned Officers' Certificate, the Company will furnish
the Trustee and the Company's principal Paying Agent or Paying Agents, if other
than the Trustee, with an Officers' Certificate instructing the Trustee and such
Paying Agent or Paying Agents whether such payment of principal of and any
premium or interest on the Securities of that series shall be made to Holders of
Securities of that series or any related coupons who are not United States
persons without withholding for or on account of any tax, assessment or other
governmental charge described in the Securities of the series. If any such
withholding shall be required, then such Officers' Certificate shall specify by
country the amount, if any, required to be withheld on such payments to such
Holders of Securities of that series or related coupons and the Company will pay
to the Trustee or such Paying Agent the Additional Amounts required by the terms
of such Securities. If the Trustee or any Paying Agent, as the case may be,
shall not so receive the above-mentioned certificate, then the Trustee or such
Paying Agent shall be entitled (i) to assume that no such withholding or
deduction is required with respect to any payment of principal or interest with
respect to any Securities of a series or related coupons until it shall have
received a certificate advising otherwise and (ii) to make all payments of
principal and interest with respect to the Securities of a series or related
coupons without withholding or deductions until otherwise advised. The Company
covenants to indemnify the Trustee and any Paying Agent for, and to hold them
harmless against, any loss, liability or expense reasonably incurred without
gross negligence or bad faith on their part arising out of or in connection with
actions taken or omitted by any them or in reliance on any Officers' Certificate
furnished pursuant to this Section or in reliance on the Company's not
furnishing such an Officers' Certificate.

  Section 1013  Waiver of Certain Covenants.  The Company may omit in any
                ---------------------------  
particular instance to comply with any term, provision or condition set forth in
Sections 1006 to 1010, inclusive, if before or after the time for such
compliance the Holders of at least a majority in principal amount of all
outstanding Securities of such series, by Act of such Holders, either waive such
compliance in such instance or generally waive compliance with such covenant or
condition, but no such waiver shall extend to or affect such covenant or
condition except to the extent so expressly waived, and, until such waiver shall
become effective, the obligations of the

                                       57
<PAGE>
 
Company and the duties of the Trustee in respect of any such term, provision or
condition shall remain in full force and effect.


                                  ARTICLE XI

                           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 Securities of any series) 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 or pursuant to a Board
Resolution. In case of any redemption at the election of the Company of less
than all of the Securities of any series, 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 and
of the principal amount of Securities of such series 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 issued on the same day with the same terms
are to be redeemed, the particular Securities to be redeemed shall be selected
not more than 60 days prior to the Redemption Date by the Trustee, from the
Outstanding Securities of such series issued on such date with the same terms
not previously called for redemption, by such method as the Trustee shall deem
fair and appropriate and which may provide for the selection for redemption of
portions (equal to the minimum authorized denomination for Securities of that
series or any integral multiple thereof) of the principal amount of Securities
of such series of a denomination larger than the minimum authorized denomination
for Securities of that series.

  The Trustee shall promptly notify the Company and the Security Registrar (if
other than itself) in writing of the Securities selected for redemption and, in
the case of any Securities selected for partial redemption, the principal amount
thereof to be redeemed.

  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 Security redeemed or to be redeemed only in part, to the portion of the
principal amount of such Security which has been or is to be redeemed.

  Section 1104  Notice of Redemption.  Notice of redemption shall be given in
                --------------------   
the manner provided in Section 106, not less than 30 days nor more than 60 days
prior to the Redemption Date, unless a shorter period is specified by the terms
of such series established pursuant to Section 301, to each Holder of Securities
to be redeemed, but failure to give such notice in the manner herein provided to
the Holder of any Security designated for redemption as a whole or in part, or
any defect in the notice to any such Holder, shall not affect the validity of
the proceedings for the redemption of any other such Security or portion
thereof.

  Any notice that is mailed to the Holders of Registered Securities in the
manner herein provided shall be conclusively presumed to have been duly given
whether or not the Holder receives the notice.

                                       58
<PAGE>
 
  All notices of redemption shall state:

  (1) the Redemption Date,

  (2) the Redemption Price, accrued interest to the Redemption Date payable as
provided in Section 1106, if any, and Additional Amounts, if any,

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

  (4) in case any Security is to be redeemed in part only, the notice which
relates to such Security shall state that on and after the Redemption Date, upon
surrender of such Security, the Holder will receive, without a charge, a new
Security or Securities of authorized denominations for the principal amount
thereof remaining unredeemed,

  (5) that on the Redemption Date the Redemption Price and accrued interest to
the Redemption Date payable as provided in Section 1106, if any, will become due
and payable upon each such Security, or the portion thereof, to be redeemed and,
if applicable, that interest thereon shall cease to accrue on and after said
date,

  (6) the Place or Places of Payment where such Securities, together in the case
of Bearer Securities with all coupons appertaining thereto, if any, maturing
after the Redemption Date, are to be surrendered for payment of the Redemption
Price and accrued interest, if any, or for conversion,

  (7) that, unless otherwise specified in such notice, Bearer Securities of any
series, if any, surrendered for redemption must be accompanied by all coupons
maturing subsequent to the date fixed for redemption or the amount of any such
missing coupon or coupons will be deducted from the Redemption Price, unless
security or indemnity satisfactory to the Company and the Trustee for such
series and any Paying Agent is furnished,

  (8) if Bearer Securities of any series are to be redeemed and any Registered
Securities of such series are not to be redeemed, and if such Bearer Securities
may be exchanged for Registered Securities not subject to redemption on this
Redemption Date pursuant to Section 305 or otherwise, the last date, as
determined by the Company, on which such exchanges may be made,

  (9) the CUSIP number of such Security, if any, and

  (10) if applicable, that a Holder of Securities who desires to convert
Securities for redemption must satisfy the requirements for conversion contained
in such Securities, the then existing conversion price or rate, and the date and
time when the option to convert shall expire.

  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.

  Section 1105  Deposit of Redemption Price.  At least one Business Day 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 in the
currency or currencies, currency unit or units or composite currency or
currencies in which the Securities of such series are payable (except as
otherwise

                                       59
<PAGE>
 
specified pursuant to Section 301 for the Securities of such series) sufficient
to pay on the Redemption Date the Redemption Price of, and (except if the
Redemption Date shall be an Interest Payment Date) accrued interest on, all the
Securities or portions thereof which are to be redeemed on that date.

  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 in the currency or currencies, currency unit or units or composite
currency or currencies in which the Securities of such series are payable
(except as otherwise specified pursuant to Section 301 for the Securities of
such series) (together with accrued interest, if any, to the Redemption Date),
and from and after such date (unless the Company shall default in the payment of
the Redemption Price and accrued interest) such Securities shall, if the same
were interest-bearing, cease to bear interest and the coupons for such interest
appertaining to any Bearer Securities so to be redeemed, except to the extent
provided below, shall be void. Upon surrender of any such Security for
redemption in accordance with said notice, together with all coupons, if any,
appertaining thereto maturing after the Redemption Date, such Security shall be
paid by the Company at the Redemption Price, together with accrued interest, if
any, to the Redemption Date; provided, however, that installments of interest on
                             --------  -------                                  
Bearer Securities whose Stated Maturity is on or prior to the Redemption Date
shall be payable only at an office or agency located outside the United States
(except as otherwise provided in Section 1002) and, unless otherwise specified
as contemplated by Section 301, only upon presentation and surrender of coupons
for such interest; and provided further that, installments of interest on
                       -------- -------                                  
Registered Securities whose Stated Maturity is on or prior to the Redemption
Date shall 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 Bearer Security surrendered for redemption shall not be accompanied by
all appurtenant coupons maturing after the Redemption Date, such Security may be
paid after deducting from the Redemption Price an amount equal to the face
amount of all such missing coupons, or the surrender of such missing coupon or
coupons may be waived by the Company and the Trustee if there be furnished to
them such security or indemnity as they may require to save each of them and any
Paying Agent harmless.  If thereafter the Holder of such Security shall
surrender to the Trustee or any Paying Agent any such missing coupon in respect
of which a deduction shall have been made from the Redemption Price, such Holder
shall be entitled to receive the amount so deducted; provided, however, that
                                                     --------  -------      
interest represented by coupons shall be payable only at an office or agency
located outside the United States (except as otherwise provided in Section 1002)
and, unless otherwise specified as contemplated by Section 301, only upon
presentation and surrender of those coupons.

  If any Security called for redemption shall not be so paid upon surrender
thereof for redemption, the principal (and premium or Make-Whole Amount, if any)
shall, until paid, bear interest from the Redemption Date at the rate borne by
the Security.

  Section 1107  Securities Redeemed in Part.  Any Registered Security which is
                ---------------------------   
to be redeemed only in part (pursuant to the provisions of this Article) 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 his 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,
of any authorized denomination as

                                       60
<PAGE>
 
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 XII

                            [INTENTIONALLY OMITTED]



                                 ARTICLE XIII

                      REPAYMENT AT THE OPTION OF HOLDERS

  Section 1301  Applicability of Article.  Repayment of Securities of any
                ------------------------   
series before their Stated Maturity at the option of Holders thereof shall be
made in accordance with the terms of such Securities, if any, and (except as
otherwise specified by the terms of such series established pursuant to Section
301) in accordance with this Article.

  Section 1302  Repayment of Securities.  Securities of any series subject to
                -----------------------            
repayment in whole or in part at the option of the Holders thereof will, unless
otherwise provided in the terms of such Securities, be repaid at a price equal
to the principal amount thereof, together with interest, if any, thereon accrued
to the Repayment Date specified in or pursuant to the terms of such Securities.
The Company covenants that at least one Business Day prior to the Repayment Date
it will 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 in the currency or currencies, currency unit or
units or composite currency or currencies in which the Securities of such series
are payable (except as otherwise specified pursuant to Section 301 for the
Securities of such series) sufficient to pay the principal (or, if so provided
by the terms of the Securities of any series, a percentage of the principal) of,
and (except if the Repayment Date shall be an Interest Payment Date) accrued
interest on, all the Securities or portions thereof, as the case may be, to be
repaid on such date.

  Section 1303  Exercise of Option.  Securities of any series subject to
                ------------------   
repayment at the option of the Holders thereof will contain an "Option to Elect
Repayment" form on the reverse of such Securities. In order for any Security to
be repaid at the option of the Holder, the Trustee must receive at the Place of
Payment theretofore specified in the terms of such Security (or at such other
place or places of which the Company shall from time to time notify the Holders
of such Securities) not earlier than 60 days nor later than 30 days prior to the
Repayment Date (1) the Security so providing for such repayment together with
the "Option to Elect Repayment" form on the reverse thereof duly completed by
the Holder (or by the Holder's attorney duly authorized in writing) or (2) a
telegram, facsimile transmission or a letter from a member of a national
securities exchange, or the National Association of Securities Dealers, Inc.
("NASD"), or a commercial bank or trust company in the United States setting
forth the name of the Holder of the Security, the principal amount of the
Security, the principal amount of the Security to be repaid, the CUSIP number,
if any, or a description of the tenor and terms of the Security, a statement
that the option to elect repayment is being exercised thereby and a guarantee
that the Security to be repaid, together with the duly completed form entitled
"Option to Elect Repayment" on the reverse of the Security, will be received by
the Trustee not later than the fifth Business Day after the date of such
telegram, facsimile transmission or letter; provided, however, that such
                                            --------  -------           
telegram, facsimile transmission or letter shall only be effective if such
Security and form duly completed are received by the Trustee by such fifth
Business Day.  If less than the

                                       61
<PAGE>
 
entire principal amount of such Security is to be repaid in accordance with the
terms of such Security, the principal amount of such Security to be repaid, in
increments of the minimum denomination for Securities of such series, and the
denomination or denominations of the Security or Securities to be issued to the
Holder for the portion of the principal amount of such Security surrendered that
is not to be repaid, must be specified. The principal amount of any Security
providing for repayment at the option of the Holder thereof may not be repaid in
part if, following such repayment, the unpaid principal amount of such Security
would be less than the minimum authorized denomination of Securities of the
series of which such Security to be repaid is a part. Except as otherwise may be
provided by the terms of any Security providing for repayment at the option of
the Holder thereof, exercise of the repayment option by the Holder shall be
irrevocable unless waived by the Company.

  Section 1304  When Securities Presented for Repayment Become Due and Payable.
                --------------------------------------------------------------
If Securities of any series provide repayment at the option of the Holders
thereof and shall have been surrendered as provided in this Article and as
provided by or pursuant to the terms of such Securities, such Securities or the
portion thereof, as the case may be, to be repaid shall become due and payable
and shall be paid by the Company on the Repayment Date therein specified, and on
and after such Repayment Date (unless the Company shall default in the payment
of such Securities on such Repayment Date) such Securities shall, if the same
were interest-bearing, cease to bear interest and the coupons for such interest
appertaining to any Bearer Securities so to be repaid, except to the extent
provided below, shall be void. Upon surrender of any such Security for repayment
in accordance with such provisions, together with coupons, if any, appertaining
thereto maturing after the Repayment Date, the principal amount of such Security
so to be repaid shall be paid by the Company, together with accrued interest, if
any, on the Repayment Date; provided, however, that coupons whose Stated
                            --------  -------              
Maturity is on or prior to the Repayment Date shall be payable at an office or
agency located outside the United States (except as otherwise provided in
Section 1002) and, unless otherwise specified pursuant to Section 301, only upon
presentation and surrender of such coupons; and provided further that, in the
                                                -------- -------
case of Registered Securities, installments of interest, if any, whose Stated
Maturity is on or prior to the Repayment Date shall be payable (but without
interest thereon, unless the Company shall default in the payment thereof) 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 Bearer Security surrendered for repayment shall not be accompanied by
all appurtenant coupons maturing after the Repayment Date, such Security may be
paid after deducting from the amount payable therefor as provided in Section
1302 an amount equal to the face amount of all such missing coupons, or the
surrender of such missing coupon or coupons may be waived by the Company and the
Trustee if there be furnished to it such security or indemnity as they may
require to save it and any Paying Agent harmless. If thereafter the Holder of
such Security shall surrender to the Trustee or any Paying Agent any such
missing coupon in respect of which a deduction shall have been made as provided
in the preceding sentence, such Holder shall be entitled to receive the amount
so deducted; provided, however, that interest represented by coupons shall be
             --------  -------  
payable only at an office or agency located outside the United States (except as
otherwise provided in Section 1002) and, unless otherwise specified as
contemplated by Section 301, only upon presentation and surrender of those
coupons.

  If the principal amount of any Security surrendered for repayment shall not be
so repaid upon surrender thereof, such principal amount (together with interest,
if any, thereon accrued to such Repayment Date) shall, until paid, bear interest
from the Repayment Date at the rate of interest or Yield to Maturity (in the
case of Original Issue Discount Securities) set forth in such Security.

                                       62
<PAGE>
 
  Sectin 1305  Securities Repaid in Part.  Upon surrender of any Registered
               -------------------------   
Security which is to be repaid in part only, the Company shall execute and the
Trustee shall authenticate and deliver to the Holder of such Security, without
service charge and at the expense of the Company, a new Registered Security or
Securities of the same series, of any authorized denomination specified by the
Holder, in an aggregate principal amount equal to and in exchange for the
portion of the principal of such Security so surrendered which is not to be
repaid.


                                  ARTICLE XIV

                      DEFEASANCE AND COVENANT DEFEASANCE

  Section 1401  Applicability of Article; Company's Option to Effect
                ----------------------------------------------------
Defeasance or Covenant Defeasance.  If, pursuant to Section 301, provision is
- ---------------------------------
made for either or both of (a) defeasance of the Securities of or within a
series under Section 1402 or (b) covenant defeasance of the Securities of or
within a series under Section 1403, then the provisions of such Section or
Sections, as the case may be, together with the other provisions of this Article
(with such modifications thereto as may be specified pursuant to Section 301
with respect to any Securities), shall be applicable to such Securities and any
coupons appertaining thereto, and the Company may at its option by Board
Resolution, at any time, with respect to such Securities and any coupons
appertaining thereto, elect to have Section 1402 (if applicable) or Section 1403
(if applicable) be applied to such Outstanding Securities and any coupons
appertaining thereto upon compliance with the conditions set forth below in this
Article.

  Section 1402  Defeasance and Discharge.  Upon the Company's exercise of the
                ------------------------   
above option applicable to this Section with respect to any Securities of or
within a series, the Company shall be deemed to have been discharged from its
obligations with respect to such Outstanding Securities and any coupons
appertaining thereto on the date the conditions set forth in Section 1404 are
satisfied (hereinafter, "defeasance"). For this purpose, such defeasance means
that the Company shall be deemed to have paid and discharged the entire
indebtedness represented by such Outstanding Securities and any coupons
appertaining thereto, which shall thereafter be deemed to be "Outstanding" only
for the purposes of Section 1405 and the other Sections of this Indenture
referred to in clauses (A) and (B) below, and to have satisfied all of its other
obligations under such Securities and any coupons appertaining thereto and this
Indenture insofar as such Securities and any coupons appertaining thereto are
concerned (and the Trustee, at the expense of the Company, shall execute proper
instruments acknowledging the same), except for the following which shall
survive until otherwise terminated or discharged hereunder: (A) the rights of
Holders of such Outstanding Securities and any coupons appertaining thereto to
receive, solely from the trust fund described in Section 1404 and as more fully
set forth in such Section, payments in respect of the principal of (and premium
or Make-Whole Amount, if any) and interest, if any, on such Securities and any
coupons appertaining thereto when such payments are due, (B) the Company's
obligations with respect to such Securities under Sections 305, 1002 and 1003
and with respect to the payment of Additional Amounts, if any, on such
Securities as contemplated by Section 1012, (C) the rights, powers, trusts,
duties and immunities of the Trustee hereunder and (D) this Article. Subject to
compliance with this Article XIV, the Company may exercise its option under this
Section notwithstanding the prior exercise of its option under Section 1403 with
respect to such Securities and any coupons appertaining thereto.

  Section 1403  Covenant Defeasance.  Upon the Company's exercise of the above
                -------------------        
option applicable to this Section with respect to any Securities of or within a
series, the Company shall be released from its obligations under Sections 1004
to 1010, inclusive and, if specified pursuant to Section 301, its obligations
under any other covenant, with respect to such Outstanding Securities and
coupons appertaining thereto on and after the date the conditions set forth in
Section 1404 are satisfied (hereinafter, "covenant defeasance"), and such
Securities and any

                                       63
<PAGE>
 
coupons appertaining thereto shall thereafter be deemed to be not "Outstanding"
for the purposes of any direction, waiver, consent or declaration or Act of
Holders (and the consequences of any thereof) in connection with Sections 1004
to 1010, inclusive, or such other covenant, but shall continue to be deemed
"Outstanding" for all other purposes hereunder. For this purpose, such covenant
defeasance means that, with respect to such Outstanding Securities and any
coupons appertaining thereto, 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 Section or such other covenant, whether directly or indirectly, by reason
of any reference elsewhere herein to any such Section or such other covenant or
by reason of reference in any Section or such other covenant to any other
provision herein or in any other document and such omission to comply shall not
constitute a default or an Event of Default under Section 501(3) or 501(7) or
otherwise, as the case may be, but, except as specified above, the remainder of
this Indenture and such Securities and any coupons appertaining thereto shall be
unaffected thereby.

  Section 1404  Conditions to Defeasance or Covenant Defeasance.  The following 
                -----------------------------------------------   
shall be the conditions for application of Section 1402 or Section
1403 to any Outstanding Securities of or within a series and any coupons
appertaining thereto:

       (a) The Company shall irrevocably have deposited or caused to be
deposited with the Trustee (or another trustee satisfying the requirements of
Section 611 who shall agree to comply with the provisions of this Article XIV
applicable to it) as trust funds in trust for the purposes of making the
following payments, specifically pledged as security for, and dedicated solely
to, the benefit of the Holders of such Securities and any coupons appertaining
thereto: (1) an amount in such currency, currencies, currency unit or composite
currency in which such Securities and any coupons appertaining thereto are then
specified as payable at Stated Maturity, or (2) Government Obligations
applicable to such Securities and coupons appertaining thereto (determined on
the basis of the currency, currencies, currency unit or composite currency in
which such Securities and coupons appertaining thereto are then specified as
payable at Stated Maturity) which through the scheduled payment of principal and
interest in respect thereof in accordance with the terms will provide, not later
than one day before the due date of any payment of principal of (and premium or
Make-Whole Amount, if any) and interest, if any, on such Securities and any
coupons appertaining thereto, money in an amount, or (3) a combination thereof,
in any case, in an amount, sufficient, without consideration of any reinvestment
of such principal and interest, 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, the principal of (and premium or
Make-Whole Amount, if any) and interest, if any, on such Outstanding Securities
and any coupons appertaining thereto on the Stated Maturity of such principal or
installment of principal or interest or analogous payments applicable to such
Outstanding Securities and any coupons appertaining thereto on the day on which
such payments are due and payable in accordance with the terms of this Indenture
and of such Securities and any coupons appertaining thereto.

       (b) Such defeasance or covenant defeasance shall not result in a breach
or violation of, or constitute a default under, this Indenture or any other
material agreement or instrument to which the Company is a party or by which it
is bound.

       (c) No Event of Default or event which with notice or lapse of time or
both would become an Event of Default with respect to such Securities and any
coupons appertaining thereto shall have occurred and be continuing on the date
of such deposit or, insofar as Sections 501(6) and 501(7) are concerned, at any
time during the period ending on the 91st day after the date of such deposit (it
being understood that this condition shall not be deemed satisfied until the
expiration of such period).

                                       64
<PAGE>
 
       (d) In the case of an election under Section 1402, the Company shall have
delivered to the Trustee an Opinion of Counsel complying with Section 102 and
stating that (i) the Company has received from, or there has been published by,
the Internal Revenue Service a ruling, or (ii) since the date of execution of
this Indenture, there has been a change in the applicable Federal income tax
law, in either case to the effect that, and based thereon such opinion shall
confirm that, the Holders of such Outstanding Securities and any coupons
appertaining thereto will not recognize income, gain or loss for Federal income
tax purposes as a result of such defeasance and will be subject to Federal
income tax on the same amounts, in the same manner and at the same times as
would have been the case if such defeasance had not occurred.

       (e) In the case of an election under Section 1403, the Company shall have
delivered to the Trustee an Opinion of Counsel complying with Section 102 and
stating that the Holders of such Outstanding Securities and any coupons
appertaining thereto will not recognize income, gain or loss for Federal income
tax purposes as a result of such covenant defeasance and will be subject to
Federal income tax on the same amounts, in the same manner and at the same times
as would have been the case if such covenant defeasance had not occurred.

       (f) The Company shall have delivered to the Trustee an Officers'
Certificate complying with Section 102 and stating that all conditions precedent
to the defeasance under Section 1402 or the covenant defeasance under Section
1403 (as the case may be) have been complied with and an Opinion of Counsel
complying with Section 102 and stating that (A) all conditions precedent to the
defeasance under Section 1402 or the covenant defeasance under Section 1403 (as
the case may be) have been complied with and (B) either (i) as a result of a
deposit pursuant to subsection (a) above and the related exercise of the
Company's option under Section 1402 or Section 1403 (as the case may be),
registration is not required under the Investment Company Act of 1940, as
amended, by the Company with respect to the trust funds representing such
deposit or by the Trustee for such trust funds or (ii) all necessary
registrations under said Act have been effected.

       (g) Notwithstanding any other provisions of this Section, such defeasance
or covenant defeasance shall be effected in compliance with any additional or
substitute terms, conditions or limitations which may be imposed on the Company
in connection therewith pursuant to Section 301.

  Section 1405  Deposited Money and Government Obligations to Be Held in Trust;
                ---------------------------------------------------------------
Other Miscellaneous Provisions.  Subject to the provisions of the last
- ------------------------------
paragraph of Section 1003, all money and Government Obligations (or other
property as may be provided pursuant to Section 301) (including the proceeds
thereof) deposited with the Trustee (or other qualifying trustee, collectively
for purposes of this Section 1405, the "Trustee") pursuant to Section 1404 in
respect of any Outstanding Securities of any series and any coupons appertaining
thereto shall be held in trust and applied by the Trustee in accordance with the
provisions of such Securities and any coupons appertaining thereto and this
Indenture, to the payment, either directly or through any Paying Agent as the
Trustee may determine, to the Holders of such Securities and any coupons
appertaining thereto of all sums due and to become due thereon in respect of
principal (and premium or Make-Whole Amount, if any) and interest and Additional
Amounts, if any, but such money need not be segregated from other funds except
to the extent required by law.

  Unless otherwise specified with respect to any Security pursuant to Section
301, if, after a deposit referred to in Section 1404(a) has been made, (a) the
Holder of a Security in respect of which such deposit was made is entitled to,
and does, elect pursuant to Section 301 or the terms of such Security to receive
payment in a currency or currency unit other than that in which the deposit
pursuant to Section 1404(a) has been made in respect of such Security, or (b) a

                                       65
<PAGE>
 
Conversion Event occurs in respect of the currency or currency unit in which the
deposit pursuant to Section 1404(a) has been made, the indebtedness represented
by such Security and any coupons appertaining thereto shall be deemed to have
been, and will be, fully discharged and satisfied through the payment of the
principal of (and premium or Make-Whole Amount, if any), and interest, if any,
on such Security as the same becomes due out of the proceeds yielded by
converting (from time to time as specified below in the case of any such
election) the amount or other property deposited in respect of such Security
into the currency or currency unit in which such Security becomes payable as a
result of such election or Conversion Event based on the applicable market
exchange rate for such currency or currency unit in effect on the second
Business Day prior to each payment date, except, with respect to a Conversion
Event, for such currency or currency unit in effect (as nearly as feasible) at
the time of the Conversion Event.

  The Company shall pay and indemnify the Trustee against any tax, fee or other
charge imposed on or assessed against the Government Obligations deposited
pursuant to Section 1404 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, and shall be the responsibility of and paid by, the Holders of such
Outstanding Securities and any coupons appertaining thereto.

  Anything to the contrary notwithstanding subject to Section 607, the Trustee
shall deliver or pay to the Company from time to time upon the Company Request
any money or Government Obligations (or other property and any proceeds thereon)
held by it as provided in Section 1404 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 a defeasance or
covenant defeasance, as applicable, in accordance with this Article.


                                  ARTICLE XV

                       MEETINGS OF HOLDERS OF SECURITIES

  Section 1501  Purposes for Which Meetings May Be Called.  A meeting of
                -----------------------------------------   
Holders of Securities of any series may be called at any time and from time to
time pursuant to this Article to make, give or take any request, demand,
authorization, direction, notice, consent, waiver or other action provided by
this Indenture to be made, given or taken by Holders of Securities of such
series.

  Section 1502  Call, Notice and Place of Meetings.
                ---------------------------------- 

       (a) The Trustee may at any time call a meeting of Holders of Securities
of any series for any purpose specified in Section 1501, to be held at such time
and at such place in the Borough of Manhattan, the City of New York, or in
London as the Trustee shall determine. Notice of every meeting of Holders of
Securities of any series, setting forth the time and the place of such meeting
and in general terms the action proposed to be taken at such meeting, shall be
given, in the manner provided in Section 106, not less than 21 nor more than 180
days prior to the date fixed for the meeting.

       (b) In case at any time the Company pursuant to a Board Resolution, or
the Holders of at least 10% in principal amount of the Outstanding Securities of
any series shall have requested the Trustee to call a meeting of the Holders of
Securities of such series for any purpose specified in Section 1501, by written
request setting forth in reasonable detail the action proposed to be taken at
the meeting, and the Trustee shall not have made the first publication of the
notice of such meeting within 21 days after receipt of such request or shall not
hereafter proceed to cause the meeting to be held as provided herein, then the
Company or the Holders of Securities

                                       66
<PAGE>
 
of such series in the amount above specified, as the case may be, may determine
the time and the place in the Borough of Manhattan, the City of New York, or in
London for such meeting and may call such meeting for such purposes by giving
notice thereof as provided in subsection (a) of this Section.

  Section 1503  Persons Entitled to Vote at Meetings.  To be entitled to vote
                ------------------------------------   
at any meeting of Holders of Securities of any series, a Person shall be (1) a
Holder of one or more Outstanding Securities of such series, or (2) a Person
appointed by an instrument in writing as proxy for a Holder or Holders of one or
more Outstanding Securities of such series by such Holder or Holders. The only
Persons who shall be entitled to be present or to speak at any meeting of
Holders of Securities of any series shall be the Persons entitled to vote at
such meeting and their counsel, any representatives of the Trustee and its
counsel and any representatives of the Company and its counsel.

  Section 1504  Quorum; Action.  The Persons entitled to vote a majority in
                --------------   
principal amount of the Outstanding Securities of a series shall constitute a
quorum for a meeting of Holders of Securities of such series; provided, however,
that if any action is to be taken at such meeting with respect to a consent or
waiver which this Indenture expressly provides may be given by the Holders of
not less than a specified percentage in principal amount of the Outstanding
Securities of a series, the Persons entitled to vote such specified percentage
in principal amount of the Outstanding Securities of such series shall
constitute a quorum. In the absence of a quorum within 30 minutes after the time
appointed for any such meeting, the meeting shall, if convened at the request of
Holders of Securities of such series, be dissolved. In any other case the
meeting may be adjourned for a period of not less than 10 days as determined by
the chairman of the meeting prior to the adjournment of such meeting. In the
absence of a quorum at any such adjourned meeting, such adjourned meeting may be
further adjourned for a period of not less than 10 days as determined by the
chairman of the meeting prior to the adjournment of such adjourned meeting.
Notice of the reconvening of any adjourned meeting shall be given as provided in
Section 1502(a), except that such notice need be given only once not less than
five days prior to the date on which the meeting is scheduled to be reconvened.
Notice of the reconvening of any adjourned meeting shall state expressly the
percentage, as provided above, of the principal amount of the Outstanding
Securities of such series which shall constitute a quorum.

  Except as limited by the proviso to Section 902, any resolution presented to a
meeting or adjourned meeting duly reconvened at which a quorum is present as
aforesaid may be adopted by the affirmative vote of the Holders of a majority in
principal amount of the Outstanding Securities of that series; provided,
however, that, except as limited by the proviso to Section 902, any resolution
with respect to any request, demand, authorization, direction, notice, consent,
waiver or other action which this Indenture expressly provides may be made,
given or taken by the Holders of a specific percentage, which is less than a
majority, in principal amount of the Outstanding Securities of a series may be
adopted at a meeting or an adjourned meeting duly reconvened and at which a
quorum is present as aforesaid by the affirmative vote of the Holders of such
specified percentage in principal amount of the Outstanding Securities of that
series.

  Any resolution passed or decision taken at any meeting of Holders of
Securities of any series duly held in accordance with this Section shall be
binding on all the Holders of Securities of such series and the related coupons,
whether or not present or represented at the meeting.

  Notwithstanding the foregoing provisions of this Section 1504, if any action
is to be taken at a meeting of Holders of Securities of any series with respect
to any request, demand, authorization, direction, notice, consent, waiver or
other act that this Indenture expressly provides may be made, given or taken by
the Holders of a specified percentage in principal

                                       67
<PAGE>
 
amount of all Outstanding Securities affected thereby, or of the Holders of such
series and one or more additional series:

               (i)     there shall be no minimum quorum requirement for such
       meeting; and

               (ii)    the principal amount of the Outstanding Securities of
       such series that vote in favor of such request, demand, authorization,
       direction, notice, consent, waiver or other action shall be taken into
       account in determining whether such request, demand, authorization,
       direction, notice, consent, waiver or other action has been made, given
       or taken under this Indenture.

  Section 1505  Determination of Voting Rights; Conduct and Adjournment of
                ----------------------------------------------------------
Meetings.
- --------- 

       (a) Notwithstanding any provisions of this Indenture, the Trustee may
make such reasonable regulations as it may deem advisable for any meeting of
Holders of Securities of a series in regard to proof of the holding of
Securities of such series and of the appointment of proxies and in regard to the
appointment and duties of inspectors of votes, the submission and examination of
proxies, certificates and other evidence of the right to vote and such other
matters concerning the conduct of the meeting as it shall deem appropriate.
Except as otherwise permitted or required by any such regulations, the holding
of Securities shall be proved in the manner specified in Section 104 and the
appointment of any proxy shall be proved in the manner specified in Section 104
or by having the signature of the Person executing the proxy witnessed or
guaranteed by any trust company, bank or banker authorized by Section 104 to
certify to the holding of Bearer Securities. Such regulations may provide that
written instruments appointing proxies, regular on their face, may be presumed
valid and genuine without the proof specified in Section 104 or other proof.

       (b) The Trustee shall, by an instrument in writing, appoint a temporary
chairman of the meeting, unless the meeting shall have been called by the
Company or by Holders of Securities as provided in Section 1502(b), in which
case the Company or the Holders of Securities of the series calling the meeting,
as the case may be, shall in like manner appoint a temporary chairman.  A
permanent chairman and a permanent secretary of the meeting shall be elected by
vote of the Persons entitled to vote a majority in principal amount of the
Outstanding Securities of such series represented at the meeting.

       (c) At any meeting each Holder of a Security of such series or proxy
shall be entitled to one vote for each $1,000 principal amount of the
Outstanding Securities of such series held or represented by him; provided,
                                                                  --------
however, that no vote shall be cast or counted at any meeting in respect of any
- -------         
Security challenged as not Outstanding and ruled by the chairman of the meeting
to be not Outstanding. The chairman of the meeting shall have no right to vote,
except as a Holder of a Security of such series or proxy.

       (d) Any meeting of Holders of Securities of any series duly called
pursuant to Section 1502 at which a quorum is present may be adjourned from time
to time by Persons entitled to vote a majority in principal amount of the
Outstanding Securities of such series represented at the meeting, and the
meeting may be held as so adjourned without further notice.

  Section 1506  Counting Votes and Recording Action of Meetings.  The vote upon
                -----------------------------------------------   
any resolution submitted to any meeting of Holders of Securities of any series
shall be by written ballots on which shall be subscribed the signatures of the
Holders of Securities of such series or of their representatives by proxy and
the principal amounts and serial numbers of the Outstanding Securities of such
series held or represented by them. The permanent chairman of the meeting

                                       68
<PAGE>
 
shall appoint two inspectors of votes who shall count all votes cast at the
meeting for or against any resolution and who shall make and file with the
secretary of the meeting their verified written reports in duplicate of all
votes cast at the meeting. A record, at least in duplicate, of the proceedings
of each meeting of Holders of Securities of any series shall be prepared by the
secretary of the meeting and there shall be attached to said record the original
reports of the inspectors of votes on any vote by ballot taken thereat and
affidavits by one or more persons having knowledge of the fact, setting forth a
copy of the notice of the meeting and showing that said notice was given as
provided in Section 1502 and, if applicable, Section 1504. Each copy shall be
signed and verified by the affidavits of the permanent chairman and secretary of
the meeting and one such copy shall be delivered to the Company and another to
the Trustee to be preserved by the Trustee, the latter to have attached thereto
the ballots voted at the meeting. Any record so signed and verified shall be
conclusive evidence of the matters therein stated.

  Section 1507  Evidence of Action Taken by Holders.  Any request, demand,
                -----------------------------------   
authorization, direction, notice, consent, waiver or other action provided by
this Indenture to be given or taken by a specified percentage in principal
amount of the Holders of any or all series may be embodied in and evidenced by
one or more instruments of substantially similar tenor signed by such specified
percentage of 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;
proof of execution of any instrument or of a writing appointing any such agent
shall be sufficient for any purpose of this Indenture and (subject to Article
VI) conclusive in favor of the Trustee, if made in the manner provided in this
Article.

  Section 1508  Proof of Execution of Instruments.  Subject to Article VI, the
                ---------------------------------   
execution of any instrument by a Holder or his agent or proxy may be proved in
accordance with such reasonable rules and regulations as may be prescribed by
the Trustee or in such manner as shall be satisfactory to the Trustee.

  This Indenture 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 Indenture.

  IN WITNESS WHEREOF, the parties hereto have caused this Indenture to be duly
executed, and their respective corporate seals to be hereunto affixed and
attested, all as of the day and year first above written.


                                       FRONTIER CORPORATION


                                       By:
                                          --------------------------------------
                                             Title:
ATTEST


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

                                       69
<PAGE>
 
                                       THE CHASE MANHATTAN BANK, as Trustee


                                       By:______________________________________
                                             Title:

ATTEST


By:____________________________________
     Title:


STATE OF _____________      )
                            ) ss:
COUNTY OF ____________      )

  On the ____ day of ___________, 1997, before me personally came to me known,
_________________ who, being by me duly sworn, did depose and say that he/she
resides in _________________________________, that he/she is the _______________
of Frontier Corporation, one of the parties described in and which executed the
foregoing instrument; and that he/she signed his/her name thereto by authority
of said corporation.


[Notary Seal]
 
                                 ______________________________________________
                                 Notary Public
                                 Commission Expires:___________________________


STATE OF ___________        )
                            ) ss:
COUNTY OF __________        )

  On the ____ day of ___________, 1997, before me personally came to me known,
_________________ who, being by me duly sworn, did depose and say that he/she
resides in _________________________________, that he/she is the
____________________________ of The Chase Manhattan Bank, one of the parties
described in and which executed the foregoing instrument; and that he/she signed
his/her name thereto by authority of said corporation.


[Notary Seal]
 
                                 ______________________________________________
                                 Notary Public
                                 Commission Expires:___________________________

                                       70
<PAGE>
 
                                   EXHIBIT A

                            FORMS OF CERTIFICATION

                                  EXHIBIT A-1

              FORM OF CERTIFICATE TO BE GIVEN BY PERSON ENTITLED
               TO RECEIVE BEARER SECURITY OR TO OBTAIN INTEREST
                PAYABLE PRIOR TO THE EXCHANGE DATE CERTIFICATE


[Insert title or sufficient description of Securities to be delivered]

  This is to certify that, as of the date hereof, and except as set forth below,
the above-captioned Securities held by you for our account (i) are owned by
person(s) that are not citizens or residents of the United States, domestic
companies, domestic corporations or any estate or trust the income of which is
subject to United States federal income taxation regardless of its source
("United States person(s)"), (ii) are owned by United States person(s) that are
(a) foreign branches of United States financial institutions (financial
institutions, as defined in United States Treasury Regulations Section
2.165(c)(1)(v) are herein referred to as "financial institutions") purchasing
for their own account or for resale, or (b) United States person(s) who acquired
the Securities through foreign branches of United States financial institutions
and who hold the Securities through such United States financial institutions on
the date hereof (and in either case (a) or (b), each such United States
financial institution hereby agrees, on its own behalf or through its agent,
that you may advise Frontier Corporation or its agent that such financial
institution will comply with the requirements of Section 165(j)(3)(A), (B) or
(C) of the United States Internal Revenue Code of 1986, as amended, and the
regulations thereunder), or (iii) are owned by United States or foreign
financial institution(s) for purpose of resale during the restricted period (as
defined in United States Treasury Regulations Section 1.163-5(c)(2)(i)(D)(7)),
and, in addition, if the owner is a United States or foreign financial
institution described in clause (iii) above (whether or not also described in
clause (i) or (ii)), this is to further certify that such financial institution
has not acquired the Securities for purposes of resale directly or indirectly to
a United States person or to a person within the United States or its
possessions.

  As used herein, "United States" means the United States of America (including
the States and the District of Columbia); and "possessions" include Puerto Rico,
the U.S. Virgin Islands, Guam, American Samoa, Wake Island and the Northern
Mariana Islands.

  We undertake to advise you promptly by tested telex or by electronic
transmission on or prior to the date on which you intend to submit your
certification relating to the above-captioned Securities held by you for our
account in accordance with your Operating Procedures if any applicable statement
herein is not correct on such date, and in the absence of such notification it
may be assumed that this certification applies as of such date.

  This certificate excepts and does not relate to [U.S. $] _________________ of
such interest in the above-captioned Securities in respect of which we are not
able to certify and as to which we understand an exchange for an interest in a
Permanent Global Security or an exchange for and delivery of definitive
Securities (or, if relevant, collection of any interest) cannot be made until we
do so certify.

                                       71
<PAGE>
 
  We understand that this certificate may be required in connection with certain
tax legislation in the United States.  If administrative or legal proceedings
are commenced or threatened in connection with which this certificate is or
would be relevant, we irrevocably authorize you to produce this certificate or a
copy thereof to any interested party in such proceedings.


Dated:______________, 19__
[To be dated no earlier than the 15th day prior to
(i) the Exchange Date or (ii) the relevant Interest
Payment Date occurring prior to the Exchange Date,
as applicable]


                                       [Name of Person Making Certification]


                                       ________________________________________
                                       (Authorized Signatory)
                                       Name:
                                       Title:

                                       72
<PAGE>
 
                                  EXHIBIT A-2

                 FORM OF CERTIFICATE TO BE GIVEN BY EUROCLEAR
               AND CEDEL S.A. IN CONNECTION WITH THE EXCHANGE OF
             A PORTION OF A TEMPORARY GLOBAL SECURITY OR TO OBTAIN
            INTEREST PAYABLE PRIOR TO THE EXCHANGE DATE CERTIFICATE


[Insert title or sufficient description of Securities to be delivered]

  This is to certify that, based solely on written certifications that we have
received in writing, by tested telex or by electronic transmission from each of
the persons appearing in our records as persons entitled to a portion of the
principal amount set forth below (our "Member Organizations") substantially in
the form attached hereto, as of the date hereof, [U.S. $] _________________
principal amount of the above-captioned Securities (i) is owned by person(s)
that are not citizens or residents of the United States, domestic companies,
domestic corporations or any estate or trust the income of which is subject to
United States federal income taxation regardless of its source ("United States
person(s)"), (ii) is owned by United States person(s) that are (a) foreign
branches of United States financial institutions (financial institutions, as
defined in United States Treasury Regulations Section 1.165-12(c)(1)(v) are
herein referred to as "financial institutions") purchasing for their own account
or for resale, or (b) United States person(s) who acquired the Securities
through foreign branches of United States financial institutions and who hold
the Securities through such United States financial institutions on the date
hereof (and in either case (a) or (b), each such financial institution has
agreed, on its own behalf or through its agent, that we may advise Frontier
Corporation, Inc. or its agent that such financial institution will comply with
the requirements of Section 165(j)(3)(A), (B) or (C) of the Internal Revenue
Code of 1986, as amended, and the regulations thereunder), or (iii) is owned by
United States or foreign financial institution(s) for purpose of resale during
the restricted period (as defined in United States Treasury Regulations Section
1.163-5(c)(2)(i)(D)(7)), and, to further effect, that financial institutions
described in clause (iii) above (whether or not also described in clause (i) or
(ii)) have certified that they have not acquired the Securities for purposes of
resale directly or indirectly to a United States person or to a person within
the United States or its possessions.

  As used herein, "United States" means the United States of America (including
the States and the District of Columbia); and its "possessions" include Puerto
Rico, the U.S. Virgin Islands, Guam, American Samoa, Wake Island and the
Northern Mariana Islands.

  We further certify that (i) we are not making available herewith for exchange
(or, if relevant, collection of any interest) any portion of the temporary
global Security representing the above captioned Securities excepted in the
above-referenced certificates of Member Organizations and (ii) as of the date
hereof we have not received any notification from any of our Member
Organizations to the effect that the statements made by such Member
Organizations with respect to any portion of the part submitted herewith for
exchange (or, if relevant, collection of any interest) are no longer true and
cannot be relied upon as of the date hereof.

                                       73
<PAGE>
 
  We understand that this certification is required in connection with certain
tax legislation in the United States.  If administrative or legal proceedings
are commenced or threatened in connection with which this certificate is or
would be relevant, we irrevocably authorize you to produce this certificate or a
copy thereof to any interested party in such proceedings.


Dated:______________, 19__
[To be dated no earlier than the Exchange Date
or the relevant Interest Payment Date occurring
prior to the Exchange Date, as applicable]


                                 [Morgan Guaranty Trust Company of New York,
                                 Brussels Office,] as Operator of the Euroclear
                                 System [Cedel S.A.]


                                 By:___________________________________________

                                       74

<PAGE>

                                                                     Exhibit 4.2
 

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY OR A
NOMINEE THEREOF. THIS SECURITY MAY NOT BE TRANSFERRED TO, OR REGISTERED OR
EXCHANGED FOR SECURITIES REGISTERED IN THE NAME OF, ANY PERSON OTHER THAN THE
DEPOSITORY OR A NOMINEE THEREOF AND NO SUCH TRANSFER MAY BE REGISTERED, EXCEPT
IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE. EVERY SECURITY
AUTHENTICATED AND DELIVERED UPON REGISTRATION OF TRANSFER, PLEDGE OR OTHER USE
HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE
REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.
  
UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE COMPANY (AS
DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT,
AND ANY CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH
OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY
PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR
VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED
OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.
  
                             FRONTIER CORPORATION

                              7.25% NOTE DUE 2004

REGISTERED                                                      PRINCIPAL AMOUNT
No.: R-1                                                        $
                                                                 ---------------
CUSIP No.: 35906P AA 3

                                       1
<PAGE>
 
     FRONTIER CORPORATION, a business corporation incorporated and existing
under the laws of the State of New York (hereinafter called the "Company", which
term includes any successor under the Indenture hereinafter referred to), for
value received, hereby promises to pay to CEDE & Co., or registered assigns,
upon presentation, the principal sum of ___________________ and 00/100 Dollars
($___________) on May 15, 2004, and to pay interest thereon from April 27,
1997, or from the most recent Interest Payment Date to which interest has been
paid or duly provided for, semi-annually in arrears on May 15 and November 15 in
each year, commencing November 15, 1997, at the rate of 7.25% per annum, until
the entire principal hereof is paid or made available for payment. Any
capitalized term not defined herein shall have the meaning assigned to it in
that certain Indenture by and between the Company and The Chase Manhattan Bank,
a New York banking corporation, dated as of May 21, 1997. The interest so
payable on any Interest Payment Date will, as provided for in the 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 May 1 or November 1 (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 shall 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 may 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 the Indenture.

     Payment of the principal of (and premium, if any) and interest on, the
Securities will be made to The Depository Trust Company or its nominee at the
corporate trust office of the Trustee, located initially at 450 West 33rd
Street, New York, New York 10001, in such coin or currency of the United States
of America as at the time of payment is legal tender for payment of public or
private debts; provided, however, that at the option of the Company, payment of
interest may be made by (i) check mailed to the address of the Person entitled
thereto as such address shall appear in the Security Register or (ii) by wire
transfer of funds to an account of the Person entitled thereto maintained within
the United States. The Company is not required to maintain an office or agency
for such payment in the City of New York.

     Securities of this series may be redeemed as a whole or in part, at the
option of the Company at any time and from time to time, on not less than 30 or
more than 60 days' notice mailed to registered Holders thereof, at a redemption
price equal to the greater of (i) 100% of the principal amount of the Securities
to be redeemed and (ii) the sum of the present values of the Remaining Scheduled
Payments (as defined below) thereon discounted to the redemption date on a
semiannual basis (assuming a 360-day year consisting of twelve 30-day months) at
the Treasury Rate (as defined below) plus ten (10) basis points, together in
either case with accrued interest on the principal amount being redeemed to the
date of redemption.

     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 IN THIS PLACE.

                                       2
<PAGE>
 
     Unless the Certificate of Authentication hereon has been executed by or on
behalf of the Trustee 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.



                                       FRONTIER CORPORATION

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

Date:             , 1997
     -------------

ATTEST:  

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

[SEAL]

                                       3
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION
                    ---------------------------------------

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

THE CHASE MANHATTAN BANK,
as Trustee  


By:                                       Date:                     , 1997
   --------------------------------            ---------------------
         Authorized Officer

                                       4
<PAGE>
 
                             FRONTIER CORPORATION

                              7.25% NOTE DUE 2004

     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 (the "Indenture") between the Company and The Chase
Manhattan Bank, a banking corporation organized under the laws of the State of
New York, as Trustee (herein called the "Trustee", which term includes any
successor trustee under the Indenture with respect to the series of which this
Security is a part), to which Indenture and all indentures supplemental thereto
reference is hereby made 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. Any capitalized term not defined herein
shall have the meaning assigned to it in the Indenture. This Security is one of
the series designated on the first page hereof, limited in aggregate principal
amount to Three Hundred Million and 00/100 Dollars ($300,000,000.00)

     "Treasury Rate" means, with respect to any redemption date, the rate per
annum equal to the semiannual equivalent yield to maturity (computed as of the
second business day immediately preceding such redemption date) of the
Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue
(expressed as a percentage of its principal amount) equal to the Comparable
Treasury Price for such redemption date.

     "Comparable Treasury Issue" means the United States Treasury security
selected by an Independent Investment Banker as having a maturity comparable
to the remaining term of the Securities to be redeemed that would be utilized,
at the time of selection and in accordance with customary financial practice,
in pricing new issues of corporate debt securities of comparable maturity to the
remaining term of the Securities. "Independent Investment Banker" means one of
the Reference Treasury Dealers appointed by the Company.

     "Comparable Treasury Price" means, with respect to any redemption date,
(i) the average of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) on the third
business day preceding such redemption date, as set forth in the daily
statistical release (or any successor release) published by the Federal Reserve
Bank of New York and designated "Composite 3:30 p.m. Quotations for U.S.
Government Securities" or (ii) if such release (or any successor release) is not
published or does not contain such prices on such business day, (A) the average
of the Reference Treasury Dealer Quotations for such redemption date, after
excluding the highest and lowest of such Reference Treasury Dealer Quotations,
or (B) if the Trustee obtains fewer than four such Reference Treasury Dealer
Quotations, the average of all such Quotations or (C) if the Trustee is able to
obtain only one Reference Treasury Dealer Quotation from the Reference Treasury
Dealers, such Quotation. "Reference Treasury Dealer Quotations" means, with
respect to each Reference Treasury Dealer and any redemption date, the average,
as determined by the Trustee, of the bid and asked prices for the Comparable
Treasury Issue (expressed in each case as a percentage of its principal amount)
quoted in writing to the Trustee by such Reference Treasury Dealer as of 5:00
p.m., New York City time on the third business day preceding such redemption
date.

     "Lien" means any lien, mortgage, pledge, security interest, charge, or
encumbrance of any kind (including any conditional sale or title retention
agreement or any lease in the nature thereof, any capital lease obligation and
any sale and lease back transaction) and any agreement to give or refrain from
any lien, mortgage, pledge, security interest, charge, or other encumbrance of
any kind.

     "Reference Treasury Dealer" means each of Salomon Brothers Inc, Lehman
Brothers, Chase Securities Inc. and Morgan Stanley & Co. Incorporated and their
respective successors; provided, however, that if any of the foregoing shall
cease to be a primary U.S. Government

                                       5
<PAGE>
 
securities dealer in New YorK City (a "Primary Treasury Dealer"), the Company
shall substitute therefor another nationally recognized investment banking firm
that is a Primary Treasury Dealer.

     "Remaining Scheduled Payments" means, with respect to each Security to be
redeemed, the remaining scheduled payments of the principal thereof and interest
thereon that would be due after the related redemption date but for such
redemption; provided, however, that, if such redemption date is not an Interest
Payment Date with respect to such Security, the amount of the next succeeding
scheduled interest payment thereon will be reduced by the amount of interest
accrued thereon to such redemption date.

     If at any time the Company or any of its subsidiaries mortgages, pledges or
otherwise subjects to or permits to exist any Lien on the whole or any part of
any property or assets now owned or hereafter acquired by it, except as
hereinafter provided, the Company will (or will cause such subsidiary to) secure
the outstanding Securities of this series, and, if the Company elects, any other
obligations of the Company ranking on a parity with the Securities of this
series, equally and ratably with the indebtedness or obligations secured by
such mortgage, pledge or other Lien, for as long as any such indebtedness or
obligation is so secured. The foregoing covenant does not apply to (a) the
creation, extension, renewal or refunding of purchase-money mortgages or liens,
(b) landlords' liens, (c) liens with respect to the sale or financing of
accounts or chattel paper, (d) liens to which any property or asset acquired
by the Company or such subsidiary is subject as of the date of its acquisition,
(e) the making of any deposit or pledge to secure public or statutory
obligations or with any governmental agency at any time required by law in
order to qualify the Company or such subsidiary to conduct its business or any
part thereof or in order to entitle it to maintain self-insurance or to obtain
the benefits of any law relating to worker's compensation, unemployment
insurance, old age pensions or other social security, or with any court, board
commission, or governmental agency as security incident to the proper conduct of
any proceeding before it, or (f) other Liens not otherwise permitted securing
obligations in an aggregate amount not to exceed Twenty-Five Million and 00/100
Dollars ($25,000,000.00).

     The Indenture contains provisions for defeasance at any time of (a) the
entire indebtedness of the Company on this Security and (b) certain restrictive
covenants and the related defaults and Events of Default applicable to the
Company, in each case, upon compliance by the Company with certain conditions
set forth in the Indenture, which provisions apply to this Security.

     If any 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.

     The Securities of this series do not have the benefit of any sinking fund
obligation.

     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 hereunder, unless (i) such Holder shall have previously given
written notice to the Trustee of a continuing Event of Default with respect to
the Securities of this series, (ii) 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, (iii) such Holder or Holders have offered
reasonable indemnity to the Trustee against the costs, expenses (including
expenses of counsel) and liabilities to be incurred in compliance with such
request, (iv) the Trustee shall have failed to institute any such proceeding for
60 days after its receipt of such notice, request and offer of indemnity, and
(v) 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. The foregoing shall not apply to any
suit instituted by

                                       6
<PAGE>
 
the Holder of this Security for the enforcement of any payment of principal
hereof (and premium, if any) or any interest thereon on or after the respective
due dates expressed herein.


     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 not less than a majority in principal amount of the
Securities of each series at the time Outstanding affected thereby. The
Indenture also contains provisions permitting the Holders of at least a
majority 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 Holders 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 therefore or in
lieu hereof, whether or not notation of such consent or waiver is made upon this
Security.

     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, premium, if any, on, 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 of Payment where the principal of, premium,
if any, on, 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 his
attorney duly authorized in writing, and thereon one or more new Securities of
this series, 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 $1,000 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 of a different authorized denomination, as required
by the Holder surrendering the same.

     No service charge shall be made for any registration of transfer or
exchange of Securities of this series, but the Company may require payment of
a sum sufficient to cover any tax or other governmental charge payable in
connection therewith. In no event shall the Company be required to pay any
Additional Amounts as contemplated by the Indenture.

     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.

     No recourse under or upon any obligation, covenant or agreement contained
in the Indenture or in this Security, or because of any indebtedness evidenced
thereby or hereby, shall be had against any promoter, as such or, against any
past, present or future stockholder, partner, officer or director, as such, of
the Company or of any successor, either directly or through the Company or any
successor, under any rule of law, statute or constitutional provision or by the
enforcement of any assessment or by any legal or equitable proceeding or
otherwise, all such liability being expressly waived and released by the
acceptance of this Security by the Holder thereof and as part of the
consideration for the issue of the Securities of this series.

                                       7
<PAGE>
 
     THE INDENTURE AND THE SECURITIES, INCLUDING THIS SECURITY, SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.


     Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Company has caused "CUSIP" numbers to be
printed on the Securities of this series as a convenience to the Holders of such
Securities. No representation is made as to the correctness or accuracy of such
CUSIP numbers as printed on the Securities, and reliance may be placed only on
the other identification numbers printed hereon.

                                       8
<PAGE>
 
                                 ABBREVIATIONS


     The following abbreviations, when used in the inscription on the face of
this instrument, shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COMM -         as tenants in common              UNIF GIFT MIN ACT -
TEN ENT  -         as tenants by the entities                Custodian
                                                       ------         --------
JT TEN   -         as joint tenants with right         (Cust)          (Minor)
                   of survivorship and not as      Under Uniform Gifts to Minors
                   tenants in common               Act
                                                      --------------------
                                                             (State)

Additional abbreviations may also be used though not in the above list.  

                   --------------------------------------

Social Security or taxpayer I.D. or other identifying number of assignee.  


- ------------------------------  

  FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto


- --------------------------------------------------------------------------------

- --------------------------------------------------------------------------------
                        (name and address of assignee)

the within Note and all rights thereunder, hereby irrevocably constituting and
appointing                  , attorney to transfer said Note on the books kept
           -----------------
for registration thereof, with full power of substitution in the premises.

Dated:
      ------------------- 



                                           ------------------------------------

                                       9

<PAGE>

                                                                     Exhibit 5.1


 
                       [Frontier Corporation Letterhead]
                                 May 23, 1997

Frontier Corporation
Board of Directors
180 South Clinton Avenue
Rochester, New York 14646

Ladies and Gentlemen:  

     I am the Vice President Legal and Planning of Frontier Corporation, a New
York business corporation (the "Company"), and are delivering this opinion
letter in connection with (i) its registration statement on Form S-3 (the
"Registration Statement") declared effective by the Securities and Exchange
Commission on January 26, 1996 (File No. 33-64307) relating to the proposed
public offering of up to $500,000,000 in aggregate amount of one or more series
of (A) unsecured debt securities (the "Debt Securities"), (B) Class A Preferred
Stock, $100.00 par value (the "Class A Preferred Stock"), (C) Cumulative
Preferred Stock, $100.00 par value (the "Cumulative Preferred Stock"; the Class
A Preferred Stock and Cumulative Preferred Stock are hereinafter collectively
referred to as the "Preferred Shares"); (D) common stock, $1.00 par value (the
"Common Shares"), or (E) warrants to purchase Common Shares (the "Securities
Warrants" and, together with the Debt Securities, Preferred Shares and Common
Shares, the "Securities"), all of which Securities may be offered and sold by
the Company from time to time as set forth in the prospectus which forms a part
of the Registration Statement (the "Prospectus"), and as to be set forth in one
or more supplements to the Prospectus (each, a "Prospectus Supplement"), and
(ii) that certain Prospectus Supplement (the "Debt Offering Prospectus
Supplement") relating to the offering of $300,000,000.00 of 7.25% Notes due 2004
(the "Notes"). This opinion letter is furnished to you at your request to enable
you to fulfill the requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R.
229.601(b)(5), in connection with the Registration Statement, and is limited to
the issuance of the Notes.

     For purposes of this opinion letter, I have examined copies of the
following documents:

     A. An executed copy of the Registration Statement;

     B. The Debt Offering Prospectus Supplement;

     C. The Officer's Certificate establishing the terms of the Notes;

     D. The Company's Amended and Restated Certificate of Incorporation, as
        amended, as certified by the Assistant Secretary of the Company on the
        date hereof as then being complete, accurate and in effect;

     E. The Bylaws of the Company, as certified by the Assistant Secretary of
        the Company on the date hereof as then being complete, accurate and in
        effect;
<PAGE>
 
Frontier Corporation
May 23, 1997
Page 2

     F. Resolutions of the Board of Directors of the Company adopted on
        September 18, 1995 and March 21, 1997, as certified by the Assistant
        Secretary of the Company on November 15, 1995 and May 14, 1997,
        respectively, as then being complete, accurate and in effect, relating
        to the filing of the Registration Statement, the offering of the Notes,
        and related matters.

     G. The form of Indenture between the Company and The Chase Manhattan Bank,
        as trustee (the "Trustee"), filed as an exhibit to the Company's Current
        Report on Form 8-K fled on or around the date of this letter (the
        "Indenture")

     The documents listed in items A-G above are collectively referred to as the
"Documents".

     In rendering this opinion, I have assumed, without independent
verification, that: (i) all signatures are genuine; (ii) all Documents submitted
to me as originals are authentic; and (iii) all Documents submitted to me as
copies conform to the originals of such Documents. My review has been limited to
examining the Documents and applicable law.

     Based upon, and subject to and limited by the foregoing, I am of the
opinion that, as of the date hereof, when the Notes have been (a) executed by
the Company as provided in the Indenture, (b) duly authenticated by the Trustee,
and (c) duly executed and delivered on behalf of the Company against payment
therefor as contemplated by the Debt Offering Prospectus Supplement, the Notes
will constitute binding obligations of the Company, enforceable in accordance
with their terms (subject, as to enforcement of remedies, to applicable
bankruptcy, reorganization, insolvency, moratorium or other laws affecting
creditors' rights from time to time in effect, and as may be limited by the
exercise of judicial discretion and the application of principles of equity,
including, without limitation, requirements of good faith, fair dealing,
conscionability and materiality).

     To the extent that the obligations of the Company under the Indenture may
be dependent upon such matters, I have assumed for purposes of this opinion that
the Trustee is duly organized, validly existing and in good standing under the
laws of its jurisdiction of organization; that the Trustee is duly qualified to
engage in the activities contemplated by the Indenture; that the Indenture has
been duly authorized, executed and delivered by the Trustee and constitutes the
legally valid and binding obligation of the Trustee enforceable against the
Trustee in accordance with its terms; that the Trustee is in compliance, with
respect to acting as a trustee under the indenture, with all applicable laws and
regulations; and that the Trustee has the requisite organizational and legal
power and authority to perform its obligations under the Indenture.

     The opinion expressed above shall be understood to mean only that if there
is a default in performance of an obligation, (i) if a failure to pay or other
damage can be shown and (ii) if the defaulting party can be brought into a
court which will hear the case and apply the governing law, then, subject to the
availability of defenses and to the exceptions set forth in the opinion, the
court will provide a money damage (or perhaps injunctive or specific
performance) remedy.

     I assume no obligation to advise you of any changes in the foregoing
subsequent to the delivery of this opinion letter.
<PAGE>
 
Frontier Corporation
May 23, 1997
Page 3

     I hereby consent to the filing of this opinion letter as Exhibit 5.1 to the
Company's Current Report on Form 8-K, and to the use of my name in the Debt
Offering Prospectus Supplement under the caption "LEGAL MATTERS".

                                       Very truly yours,
                                      

                                   /s/ Martin T. McCue
                              ---------------------------------
                                       Martin T. McCue
                              Vice President Legal and Planning

<PAGE>

                                                                    Exhibit 25.1

 
      ___________________________________________________________________

                      SECURITIES AND EXCHANGE COMMISSION
                           Washington, D. C.  20549
                           _________________________

                                   FORM  T-1

                           STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF
                  A CORPORATION DESIGNATED TO ACT AS TRUSTEE
                  ___________________________________________
              CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF
               A TRUSTEE PURSUANT TO SECTION 305(b)(2) ________
                   ________________________________________

                           THE CHASE MANHATTAN BANK
              (Exact name of trustee as specified in its charter)


New York                                                              13-4994650
(State of incorporation                                         (I.R.S. employer
if not a national bank)                                      identification No.)

270 Park Avenue
New York, New York                                                         10017
(Address of principal executive offices)                              (Zip Code)

                              William H. McDavid
                                General Counsel
                                270 Park Avenue
                           New York, New York 10017
                             Tel:  (212) 270-2611
           (Name, address and telephone number of agent for service)
                 _____________________________________________
                             Frontier Corporation
              (Exact name of obligor as specified in its charter)

New York                                                              16-0613330
(State or other jurisdiction of                                 (I.R.S. employer
incorporation or organization)                               identification No.)

180 South Clinton Avenue
Rochester, New York                                                        14646
(Address of principal executive offices)                              (Zip Code)
                 _____________________________________________
                            Senior Debt Securities
                      (Title of the indenture securities)
      ___________________________________________________________________
                                        
<PAGE>
 
                                    GENERAL

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.

            New York State Banking Department, State House, Albany, New York
            12110.

            Board of Governors of the Federal Reserve System, Washington, D.C.,
            20551
 
            Federal Reserve Bank of New York, District No. 2, 33 Liberty Street,
            New York, N.Y.

            Federal Deposit Insurance Corporation, Washington, D.C., 20429.


        (b) Whether it is authorized to exercise corporate trust powers.

            Yes.


Item 2. Affiliations with the Obligor.

        If the obligor is an affiliate of the trustee, describe each such
        affiliation.

        None.

                                      -2-
<PAGE>
 
Item 16. List of Exhibits
 
         List below all exhibits filed as a part of this Statement of
         Eligibility.

         1.  A copy of the Articles of Association of the Trustee as now in
effect, including the Organization Certificate and the Certificates of Amendment
dated February 17, 1969, August 31, 1977, December 31, 1980, September 9, 1982,
February 28, 1985, December 2, 1991 and July 10, 1996 (see Exhibit 1 to Form T-1
filed in connection with Registration Statement No. 333-06249, which is
incorporated by reference).

         2.  A copy of the Certificate of Authority of the Trustee to Commence
Business (see Exhibit 2 to Form T-1 filed in connection with Registration
Statement No. 33-50010, which is incorporated by reference.  On July 14, 1996,
in connection with the merger of Chemical Bank and The Chase Manhattan Bank
(National Association), Chemical Bank, the surviving corporation, was renamed
The Chase Manhattan Bank).

         3.  None, authorization to exercise corporate trust powers being
contained in the documents identified above as Exhibits 1 and 2.

         4.  A copy of the existing By-Laws of the Trustee (see Exhibit 4 to
Form T-1 filed in connection with Registration Statement No. 333-06249, which is
incorporated by reference).

         5.  Not applicable.

         6.  The consent of the Trustee required by Section 321(b) of the Act
(see Exhibit 6 to Form T-1 filed in connection with Registration Statement No.
33-50010, which is incorporated by reference. On July 14, 1996, in connection
with the merger of Chemical Bank and The Chase Manhattan Bank (National
Association), Chemical Bank, the surviving corporation, was renamed The Chase
Manhattan Bank).

         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.

                                   SIGNATURE

      Pursuant to the requirements of the Trust Indenture Act of 1939 the
Trustee, The Chase Manhattan Bank, a corporation organized and existing under
the laws of the State of New York, has duly caused this statement of eligibility
to be signed on its behalf by the undersigned, thereunto duly authorized, all in
the City of New York and State of New York, on the 21st day of May, 1997.

                                       THE CHASE MANHATTAN BANK

 
                                       By /s/R. Lorenzen
                                          _____________________________________
                                             R. Lorenzen
                                             Senior Trust Officer
           

                                      -3-
<PAGE>
 
                              Exhibit 7 to Form T-1


                               Bank Call Notice

                            RESERVE DISTRICT NO. 2
                      CONSOLIDATED REPORT OF CONDITION OF

                           The Chase Manhattan Bank
                 of 270 Park Avenue, New York, New York 10017
                    and Foreign and Domestic Subsidiaries,
                    a member of the Federal Reserve System,

            at the close of business March 31, 1997, in accordance
         with a call made by the Federal Reserve Bank of this District
            pursuant to the provisions of the Federal Reserve Act.


<TABLE> 
<CAPTION> 
                                                                                 Dollar Amounts
                     ASSETS                                                       In Millions
<S>                                                                    <C>       <C> 
Cash and balances due from depository institutions:
     Noninterest-bearing balances and currency and coin ........................   $  11,721
     Interest-bearing balances .................................................       3,473
Securities:.....................................................................
Held to maturity securities ....................................................       2,965
Available for sale securities ..................................................      35,903
Federal Funds sold and securities purchased under agreements to resell .........      24,025
Loans and lease financing receivables:
     Loans and leases, net of unearned income ......................   $ 123,957
     Less: Allowance for loan and lease losses .....................       2,853
     Less: Allocated transfer risk reserve .........................          13
                                                                       ---------
     Loans and leases, net of unearned income, allowance, and reserve ..........     121,091
Trading Assets .................................................................      54,340
Premises and fixed assets (including capitalized leases) .......................       2,875
Other real estate owned ........................................................         302
Investments in unconsolidated subsidiaries and associated companies ............         139
Customers' liability to this bank on acceptances outstanding ...................       2,270
Intangible assets ..............................................................       1,535
Other assets ...................................................................      10,283
                                                                                   ---------
TOTAL ASSETS ...................................................................   $ 270,922
                                                                                   =========
</TABLE> 

                                      -4-
<PAGE>
 
<TABLE> 
<CAPTION> 
                                   LIABILITIES
<S>                                                                    <C>       <C> 
Deposits
     In domestic offices .......................................................   $  84,776
     Noninterest-bearing ...........................................   $  32,492
     Interest-bearing ..............................................      52,284
                                                                          ------

     In foreign offices, Edge and Agreement subsidiaries, and IBF's ............      69,171
     Noninterest-bearing ...........................................   $   4,181
     Interest-bearing ..............................................      64,990

Federal funds purchased and securities sold under agreements
to repurchase ..................................................................      32,885
Demand notes issued to the U.S. Treasury .......................................       1,000
Trading liabilities ............................................................      42,538

Other Borrowed  money  (includes  mortgage  indebtedness  and  obligations  under
     calitalized leases):
     With a remaining maturity of one year or less .............................       4,431
     With a remaining maturity of more than one year ...........................         466
Bank's liability on acceptances executed and outstanding .......................       2,270
Subordinated notes and debentures ..............................................       5,911
Other liabilities...............................................................      11,575

TOTAL LIABILITIES ..............................................................     255,023
                                                                                   ---------


<CAPTION> 
                                 EQUITY CAPITAL
<S>                                                                              <C> 
Perpetual Preferred stock and related surplus ..................................           0
Common stock ...................................................................       1,211
Surplus  (exclude all surplus related to preferred stock) ......................      10,283
Undivided profits and capital reserves .........................................       4,941
Net unrealized holding gains (Losses) on available-for-sale securities .........        (552)
Cumulative foreign currency translation adjustments ............................          16

TOTAL EQUITY CAPITAL ...........................................................      15,899
                                                                                   ---------
TOTAL LIABILITIES, LIMITED-LIFE PREFERRED
     STOCK AND EQUITY CAPITAL ..................................................   $ 270,922
                                                                                   =========
</TABLE> 

I, Joseph L. Sclafani, E.V.P. & Controller of the above-named bank, do hereby
declare that this Report of Condition has been prepared in conformance with the
instructions issued by the appropriate Federal regulatory authority and is true
to the best of my knowledge and belief.

                                    JOSEPH L. SCLAFANI

We, the undersigned directors, attest to the correctness of this Report of
Condition and declare that it has been examined by us, and to the best of our
knowledge and belief has been prepared in conformance with the instructions
issued by the appropriate Federal regulatory authority and is true and correct.

                                    WALTER V. SHIPLEY           )
                                    THOMAS G. LABRECQUE         ) DIRECTORS
                                    WILLIAM B. HARRISON, JR.    )

                                      -5-


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