Document:

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                                                                     EXHIBIT 4.3

                                                                  EXECUTION COPY

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                         LEVEL 3 COMMUNICATIONS, INC.,

                                    Issuer

                                      to

                             THE BANK OF NEW YORK,

                                  as Trustee

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

                                   Indenture

                         Dated as of February 29, 2000

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

                                 $675,000,000

                    12 7/8% Senior Discount Notes Due 2010

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                              TABLE OF CONTENTS

                                                                          Page

PARTIES....................................................................  1
RECITALS OF THE COMPANY....................................................  1

                                  ARTICLE ONE

                       DEFINITIONS AND OTHER PROVISIONS
                            OF GENERAL APPLICATION

SECTION 101.   Definitions.................................................   2
               Accreted Value..............................................   2
               Acquired Debt...............................................   3
               Act.........................................................   4
               Affiliate...................................................   4
               Affiliate Transaction.......................................   4
               Agent Member................................................   4
               Asset Disposition...........................................   4
               Attributable Value..........................................   5
               Board of Directors..........................................   6
               Board Resolution............................................   6
               Business Day................................................   6
               Capital Lease Obligation....................................   6
               Capital Stock...............................................   6
               Cash Equivalents............................................   6
               Change of Control...........................................   8
               Change of Control Triggering Event..........................   8
               Code........................................................   8
               Commission..................................................   8
               Common Stock................................................   8
               Company.....................................................   8
               Company Order...............................................   8
               Company Request.............................................   8
               Consolidated Capital Ratio..................................   9
               Consolidated Cash Flow Available for Fixed Charges..........   9
               Consolidated Income Tax Expense.............................  10
               Consolidated Interest Expense...............................  10
               Consolidated Net Income.....................................  11
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               Consolidated Net Worth......................................  12
               Consolidated Tangible Assets................................  12
               Corporate Trust Office......................................  12
               Credit Agreement............................................  12
               Credit Facilities...........................................  12
               Debt........................................................  13
               Default.....................................................  14
               Defaulted Interest..........................................  14
               Depository..................................................  14
               Designation.................................................  14
               Designation Amount..........................................  14
               Disqualified Stock..........................................  14
               Disqualified Stock Dividends................................  14
               Dollar Notes................................................  15
               Eligible Receivables........................................  15
               Euro Notes..................................................  15
               European Government Obligation..............................  15
               European Union..............................................  15
               Event of Default............................................  15
               Exchange Act................................................  15
               Exchange Securities.........................................  16
               Excess Proceeds.............................................  16
               Existing Notes..............................................  16
               Expiration Date.............................................  16
               Fair Market Value...........................................  16
               Federal Bankruptcy Code.....................................  16
               Global Security.............................................  16
               Government Securities.......................................  16
               Guarantee...................................................  17
               Guarantor...................................................  17
               Holder......................................................  17
               Incur.......................................................  17
               Indenture...................................................  18
               Initial Purchasers..........................................  18
               Initial Securities..........................................  18
               Institutional Accredited Investor...........................  18
               Institutional Accredited Investor Global Security...........  18
               Interest Payment Date.......................................  18
               Interest Rate or Currency Protection Agreement..............  18
               Invested Capital............................................  18
               Investment..................................................  18
               Issue Date..................................................  19
               Issue Date Purchase Money Debt..............................  19
               Issue Date Rating...........................................  20
               Joint Venture...............................................  20
               Lien........................................................  20
               Maturity....................................................  20

                                     (iii)

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               Measurement Date............................................  20
               Moody's.....................................................  21
               Net Available Proceeds......................................  21
               New Convertible Notes.......................................  22
               9-1/8% Senior Notes.........................................  22
               Non-Global Purchasers.......................................  22
               Offer.......................................................  22
               Offer to Purchase...........................................  22
               Officers' Certificate.......................................  25
               Opinion of Counsel..........................................  25
               OECD........................................................  25
               Outstanding.................................................  26
               Paying Agent................................................  27
               Permitted Holders...........................................  27
               Permitted Interest Rate or Currency
                    Protection Agreement...................................  27
               Permitted Investments.......................................  27
               Permitted Liens.............................................  28
               Permitted Telecommunications Capital
                    Asset Disposition......................................  29
               Person......................................................  29
               Physical Security...........................................  29
               Predecessor Security........................................  29
               Preferred Stock.............................................  30
               Preferred Stock Dividends...................................  30
               Private Exchange Offer......................................  30
               Private Exchange Securities.................................  30
               Private Placement Legend....................................  30
               Property....................................................  30
               Proportionate Interest......................................  30
               Purchase Amount.............................................  31
               Purchase Date...............................................  31
               Purchase Money Debt.........................................  31
               Purchase Price..............................................  31
               Qualified Institutional Buyer...............................  31
               QIB.........................................................  31
               Qualified Receivable Facility...............................  31
               Rating Agencies.............................................  31
               Rating Date.................................................  32
               Rating Decline..............................................  32
               Receivables.................................................  32
               Redemption Date.............................................  32
               Redemption Price............................................  32
               refinancing.................................................  32

                                     (iii)
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               Registered Exchange Offer...................................  32
               Registration Agreement......................................  33
               Registration Default........................................  33
               Regular Record Date.........................................  33
               Regulation S................................................  33
               Regulation S Global Security................................  33
               Required Filing Dates.......................................  33
               Responsible Officer.........................................  33
               Restricted Payment..........................................  33
               Restricted Subsidiary.......................................  33
               Restricted Subsidiary Guarantee.............................  33
               Revocation..................................................  34
               Rule 144A...................................................  34
               Rule 144A Global Security...................................  34
               S&P.........................................................  34
               Sale and Leaseback Transaction..............................  34
               Securities..................................................  34
               Securities Act..............................................  35
               Security Register...........................................  35
               Security Registrar..........................................  35
               Shelf Registration Statement................................  35
               Significant Subsidiary......................................  35
               6% Convertible Notes........................................  35
               Special Assets..............................................  35
               Special Interest............................................  35
               Special Record Date.........................................  35
               Stated Maturity.............................................  35
               Subordinated Debt...........................................  36
               Subsidiary..................................................  37
               Telecommunications/IS Assets................................  37
               Telecommunications/IS Business..............................  38
               10-1/2% Senior Discount Notes...............................  38
               Trust Indenture Act.........................................  38
               TIA.........................................................  38
               Trustee.....................................................  38
               Unrestricted Subsidiary.....................................  38
               Vice President..............................................  39
               Voting Stock................................................  39
               Wholly Owned Subsidiary.....................................  39
SECTION 102.   Compliance Certificates and Opinions........................  39
SECTION 103.   Form of Documents Delivered to Trustee......................  40
SECTION 104.   Acts of Holders.............................................  41
SECTION 105.   Notices, etc., to Trustee and Company.......................  43

                                     (iv)
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SECTION 106.   Notice to Holders; Waiver...................................  43
SECTION 107.   Effect of Headings and Table of Contents....................  44
SECTION 108.   Successors and Assigns......................................  44
SECTION 109.   Separability Clause.........................................  44
SECTION 110.   Benefits of Indenture.......................................  44
SECTION 111.   Governing Law...............................................  44
SECTION 112.   Conflict with Trust Indenture Act...........................  45
SECTION 113.   Legal Holidays..............................................  45
SECTION 114.   No Personal Liability of Directors, Officers,
                    Employees and shareholders.............................  45
SECTION 115.   Independence of Covenants...................................  46
SECTION 116.   Exhibits....................................................  46
SECTION 117.   Counterparts................................................  46
SECTION 118.   Duplicate Originals.........................................  46

                                  ARTICLE TWO

                                SECURITY FORMS

SECTION 201.   Forms Generally.............................................  47

                                 ARTICLE THREE

                                THE SECURITIES

SECTION 301.   Title and Terms.............................................  47
SECTION 302.   Denominations...............................................  49
SECTION 303.   Execution, Authentication, Delivery and Dating..............  49
SECTION 304.   Temporary Securities........................................  52
SECTION 305.   Registration, Registration of Transfer and Exchange.........  53
SECTION 306.   Mutilated, Destroyed, Lost and Stolen Securities............  54
SECTION 307.   Payment of Interest; Interest Rights Preserved..............  55
SECTION 308.   Persons Deemed Owners.......................................  58
SECTION 309.   Cancellation................................................  58
SECTION 310.   Computation of Interest.....................................  59
SECTION 311.   CUSIP Number................................................  59

                                      (v)
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SECTION 312.   Book-Entry Provisions for Global Securities.................  59
SECTION 313.   Special Transfer Provisions.................................  62

                                 ARTICLE FOUR

                          SATISFACTION AND DISCHARGE

SECTION 401.   Satisfaction and Discharge of Indenture.....................  68
SECTION 402.   Application of Trust Money..................................  69

                                 ARTICLE FIVE

                                   REMEDIES

SECTION 501.   Events of Default...........................................  70
SECTION 502.   Acceleration of Maturity; Rescission and Annulment..........  72
SECTION 503.   Collection of Indebtedness and Suits for Enforcement
                    by Trustee.............................................  73
SECTION 504.   Trustee May File Proofs of Claim............................  74
SECTION 505.   Trustee May Enforce Claims Without Possession
                    of Securities..........................................  75
SECTION 506.   Application of Money Collected..............................  75
SECTION 507.   Limitation on Suits.........................................  76
SECTION 508.   Unconditional Right of Holders to Receive Accreted
                    Value, Premium and Interest............................  77
SECTION 509.   Restoration of Rights and Remedies..........................  77
SECTION 510.   Rights and Remedies Cumulative..............................  77
SECTION 511.   Delay or Omission Not Waiver................................  78
SECTION 512.   Control by Holders..........................................  78
SECTION 513.   Waiver of Past Defaults.....................................  78
SECTION 514.   Waiver of Stay or Extension Laws............................  79

                                     (vi)
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                                  ARTICLE SIX

                                  THE TRUSTEE

SECTION 601.   Certain Duties and Responsibilities.........................  80
SECTION 602.   Notice of Default...........................................  81
SECTION 603.   Certain Rights of Trustee...................................  82
SECTION 604.   Trustee Not Responsible for Recitals or Issuance
                    of Securities..........................................  83
SECTION 605.   May Hold Securities.........................................  84
SECTION 606.   Money Held in Trust.........................................  84
SECTION 607.   Compensation and Reimbursement..............................  84
SECTION 608.   Corporate Trustee Required; Eligibility; Conflicting
                    Interests..............................................  85
SECTION 609.   Resignation and Removal; Appointment of Successor...........  86
SECTION 610.   Acceptance of Appointment by Successor......................  88
SECTION 611.   Merger, Conversion, Consolidation or Succession to
                    Business...............................................  88

                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

SECTION 701.  Disclosure of Names and Addresses of Holders.................  89
SECTION 702.  Reports by Trustee...........................................  89
SECTION 703.  Reports by Company...........................................  90

                                 ARTICLE EIGHT

             CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

SECTION 801.  Company May Consolidate, etc., Only on Certain Terms.........  90
SECTION 802.  Successor Company Substituted................................  92

                                     (vii)
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SECTION 803.  Guarantor May Consolidate, etc., Only on Certain Terms.......  92
SECTION 804.  Successor Guarantor Substituted..............................  94

                                 ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

SECTION 901.  Supplemental Indentures Without Consent of Holders...........  95
SECTION 902.  Supplemental Indentures With Consent of Holders..............  96
SECTION 903.  Execution of Supplemental Indentures.........................  98
SECTION 904.  Effect of Supplemental Indentures............................  98
SECTION 905.  Conformity with Trust Indenture Act..........................  98
SECTION 906.  Reference in Securities to Supplemental Indentures...........  98
SECTION 907.  Notice of Supplemental Indentures............................  99

                                  ARTICLE TEN

                                   COVENANTS

SECTION 1001. Payment of Accreted Value, Premium, if any, and
                    Interest...............................................  99
SECTION 1002. Maintenance of Office or Agency..............................  99
SECTION 1003. Money for Security Payments to Be Held in Trust.............. 100
SECTION 1004. Corporate Existence.......................................... 102
SECTION 1005. Maintenance of Properties.................................... 102
SECTION 1006. Insurance.................................................... 103
SECTION 1007. Reports...................................................... 103
SECTION 1008. Statement by Officers as to Default.......................... 104
SECTION 1009. Change of Control Triggering Event........................... 104
SECTION 1010. Limitation on Consolidated Debt.............................. 108
SECTION 1011. Limitation on Debt of Restricted Subsidiaries................ 113
SECTION 1012. Limitation on Restricted Payments...........................  115

                                    (viii)
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SECTION 1013. Limitation on Dividend and Other Payment Restrictions
                    Affecting Restricted Subsidiaries.....................  119
SECTION 1014. Limitation on Liens.........................................  121
SECTION 1015. Limitation on Sale and Leaseback Transactions...............  123
SECTION 1016. Limitation on Asset Dispositions............................  124
SECTION 1017. Limitation on Issuance and Sales of Capital Stock of
                    Restricted Subsidiaries...............................  126
SECTION 1018. Transactions with Affiliates................................  128
SECTION 1019. Calculation of Original Issue Discount......................  130
SECTION 1020. Limitation on Designations of Unrestricted Subsidiaries.....  131

                                ARTICLE ELEVEN

                           REDEMPTION OF SECURITIES

SECTION 1101. Right of Redemption.........................................  133
SECTION 1102. Applicability of Article....................................  133
SECTION 1103. Election to Redeem; Notice to Trustee.......................  133
SECTION 1104. Selection by Trustee of Securities To Be Redeemed...........  134
SECTION 1105. Notice of Redemption........................................  134
SECTION 1106. Deposit of Redemption Price.................................  135
SECTION 1107. Securities Payable on Redemption Date.......................  136
SECTION 1108. Securities Redeemed in Part.................................  136

                      ARTICLE TWELVE

                 DEFEASANCE AND COVENANT DEFEASANCE

SECTION 1201. Company's Option to Effect Defeasance or Covenant
                    Defeasance............................................  137
SECTION 1202. Defeasance and Discharge....................................  137
SECTION 1203. Covenant Defeasance.........................................  138

                                     (ix)
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SECTION 1204.  Conditions to Defeasance or Covenant Defeasance............  140
SECTION 1205.  Deposited Money and Government Securities to Be
                    Held in Trust; Other Miscellaneous Provisions.........  142
SECTION 1206.  Reinstatement..............................................  142

EXHIBIT A - Form of Security
EXHIBIT B - Form of Supplemental Indenture

                                      (x)
<PAGE>

     INDENTURE, dated as of February 29, 2000 between Level 3 Communications,
Inc., a corporation duly organized and existing under the laws of the State of
Delaware (herein called the "Company"), having its principal office at 1025
Eldorado Boulevard, Broomfield, Colorado 80021, and The Bank of New York, a New
York banking corporation, as Trustee (herein called the "Trustee").

                            RECITALS OF THE COMPANY

     The Company has duly authorized the creation of an issue of 12 7/8% Senior
Discount Notes Due 2010 (the "Initial Securities") and, if and when issued
pursuant to a Registered Exchange Offer or Private Exchange Offer pursuant to
the Registration Agreement for the Initial Securities, 12 7/8% Senior Discount
Notes Due 2010 (the "Exchange Securities" and, together with the Initial
Securities, the "Securities"), of substantially the tenor and amount hereinafter
set forth, and to provide therefor the Company has duly authorized the execution
and delivery of this Indenture.

     All things necessary have been done to make the Securities, when executed
by the Company and authenticated and delivered hereunder and duly issued by the
Company, the valid obligations of the Company and to make this Indenture a valid
agreement of each of the Company and the Trustee, in accordance with their and
its terms.

     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:
<PAGE>

                                                                               2

                                  ARTICLE ONE

                       DEFINITIONS AND OTHER PROVISIONS
                            OF GENERAL APPLICATION

     SECTION 101.  Definitions.

     For all purposes of this Indenture, including the recitals set forth above,
except as otherwise expressly provided or unless the context otherwise requires:

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

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

          (c) all accounting terms not otherwise defined herein have the
     meanings assigned to them in accordance with generally accepted accounting
     principles, and, except as otherwise herein expressly provided, the term
     "generally accepted accounting principles" with respect to any computation
     required or permitted hereunder shall mean United States generally accepted
     accounting principles as in effect on the date of this Indenture;

          (d) 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, paragraph or other subdivision;

          (e) unless otherwise indicated, references to Articles, Sections,
     paragraphs or other subdivisions are references to such Articles, Sections,
     paragraphs or other subdivisions of this Indenture; and

          (f) "or" is not exclusive and "including" means including without
     limitation.

     "Accreted Value" of any Security as of or to any date of determination
prior to March 15, 2005, or of any other Debt issued at a price less than the
principal amount at
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                                                                               3

stated maturity, means, as of any date of determination, an amount equal to the
sum of (a) the issue price of such Debt as determined in accordance with Section
1273 of the Code or any successor provisions (which, in the case of the
Securities, will be $533.08 per $1,000 principal amount at maturity of
Securities) plus (b) the aggregate of the portions of the original issue
discount (the excess of the amounts considered as part of the "stated redemption
price at maturity" of such Debt within the meaning of Section 1273(a)(2) of the
Code or any successor provisions, whether denominated as principal or interest,
over the issue price of such Debt) that shall theretofore have accrued pursuant
to Section 1272 of the Code (without regard to Section 1272(a)(7) of the Code)
from the date of issue of such Debt to the date of determination (which amount,
in the case of the Securities, shall be amortized on a daily basis and
compounded semiannually on each March 15 and September 15 at a rate of 12 7/8%
per annum from the Issue Date through the date of determination on the basis of
a 360-day year of twelve 30-day months), minus all amounts theretofore paid in
respect of such Debt, which amounts are considered as part of the "stated
redemption price at maturity" of such Debt within the meaning of Section
1273(a)(2) of the Code or any successor provisions (whether such amounts paid
were denominated principal or interest). The Accreted Value of any Securities on
or after March 15, 2005, will mean the principal amount at maturity of such
Security. Notwithstanding the foregoing, if the Company elects to commence the
accrual of cash interest on the Securities on or after March 15, 2003 and prior
to March 15, 2005, the Securities shall cease to accrete, and the Accreted Value
and the principal amount at maturity of such Security shall be the Accreted
Value on the date of commencement of such accrual as calculated in accordance
with the first sentence of this definition.

     "Acquired Debt" means, with respect to any specified Person, (i) Debt of
any other Person existing at the time such Person merges with or into or
consolidates with or becomes a Subsidiary of such specified Person and (ii) Debt
secured by a Lien encumbering any Property acquired by such specified Person,
which Debt was not incurred in anticipation of, and was outstanding prior to,
such merger, consolidation or acquisition.
<PAGE>

                                                                               4

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

     "Affiliate" of any Person means any other Person directly or indirectly
controlling or controlled by or under direct or indirect common control with
such Person. For the purposes of this definition, "control" when used with
respect to any 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. For purposes of
Sections 1016 and 1018 and the definition of "Telecommunications/IS Assets"
only, "Affiliate" shall also mean any beneficial owner of shares representing
10% or more of the total voting power of the Voting Stock (on a fully diluted
basis) of the Company or of rights or warrants to purchase such Voting Stock
(whether or not currently exercisable) and any Person who would be an Affiliate
of any such beneficial owner pursuant to the first sentence hereof.

     "Affiliate Transaction" has the meaning specified in Section 1018.

     "Agent Member" has the meaning specified in Section 312.

     "Asset Disposition" means any transfer, conveyance, sale, lease, issuance
or other disposition by the Company or any Restricted Subsidiary in one or more
related transactions (including a consolidation or merger or other sale of any
such Restricted Subsidiary with, into or to another Person in a transaction in
which such Restricted Subsidiary ceases to be a Restricted Subsidiary of the
Company, but excluding a disposition by a Restricted Subsidiary to the Company
or a Restricted Subsidiary or by the Company to a Restricted Subsidiary) of (i)
shares of Capital Stock or other ownership interests of a Restricted Subsidiary
(other than as permitted by clause (v), (vi), (vii) or (ix) of Section 1017),
(ii) substantially all of the assets of the Company or any Restricted Subsidiary
representing a division or line of business or (iii) other Property of the
Company or any Restricted Subsidiary outside of the ordinary course of business
(excluding any transfer,
<PAGE>

                                                                               5

conveyance, sale, lease or other disposition of equipment that is obsolete or no
longer used by or useful to the Company, provided that the Company has delivered
                                         --------
to the Trustee an Officers' Certificate stating that such criteria are
satisfied); provided in each case that the aggregate consideration for such
            --------
transfer, conveyance, sale, lease or other disposition is equal to $5,000,000 or
more in any 12-month period. The following shall not be Asset Dispositions: (i)
Permitted Telecommunications Capital Asset Dispositions that comply with clause
(i) of the first paragraph of Section 1016, (ii) when used with respect to the
Company, any Asset Disposition permitted pursuant to Article Eight which
constitutes a disposition of all or substantially all of the assets of the
Company and the Restricted Subsidiaries taken as a whole, (iii) Receivables
sales constituting Debt under Qualified Receivable Facilities permitted to be
Incurred pursuant to Section 1010 and (iv) any disposition that constitutes a
Permitted Investment or a Restricted Payment permitted by Section 1012.

     "Attributable Value" means, as to any particular lease under which any
Person is at the time liable other than a Capital Lease Obligation, and at any
date as of which the amount thereof is to be determined, the total net amount of
rent required to be paid by such Person under such lease during the remaining
term thereof (including any period for which such lease has been extended) as
determined in accordance with generally accepted accounting principles,
discounted from the last date of such remaining term to the date of
determination at a rate per annum equal to the discount rate which would be
applicable to a Capital Lease Obligation with like term in accordance with
generally accepted accounting principles. The net amount of rent required to be
paid under any such lease for any such period shall be the aggregate amount of
rent payable by the lessee with respect to such period after excluding amounts
required to be paid on account of insurance, taxes, assessments, utility,
operating and labor costs and similar charges. In the case of any lease which is
terminable by the lessee upon the payment of penalty, such net amount shall also
include the lesser of the amount of such penalty (in which case no rent shall be
considered as required to be paid under such lease subsequent to the first date
upon which it may be so terminated) or the rent which would otherwise be
required to
<PAGE>

                                                                               6

be paid if such lease is not so terminated. "Attributable Value" means, as to a
Capital Lease Obligation, the principal amount thereof.

     "Board of Directors" means the board of directors of the Company.

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

     "Business Day" means each Monday, Tuesday, Wednesday, Thursday and Friday
which is not a day on which banking institutions in The City of New York are
authorized or obligated by law or executive order to close.

     "Capital Lease Obligation" of any Person means the obligation to pay rent
or other payment amount under a lease of (or other Debt arrangements conveying
the right to use) Property of such Person which is required to be classified and
accounted for as a capital lease or a liability on the face of a balance sheet
of such Person in accordance with generally accepted accounting principles (a
"Capital Lease"). The stated maturity of such obligation shall be the date of
the last payment of rent or any other amount due under such lease prior to the
first date upon which such lease may be terminated by the lessee without payment
of a penalty. The principal amount of such obligation shall be the capitalized
amount thereof that would appear on the face of a balance sheet of such Person
in accordance with generally accepted accounting principles.

     "Capital Stock" of any Person means any and all shares, interests,
participations or other equivalents (however designated) of corporate stock or
other equity participations, including partnership interests, whether general or
limited, of such Person and any rights (other than debt securities convertible
or exchangeable into an equity interest), warrants or options to acquire an
equity interest in such Person.

     "Cash Equivalents" means (i) Government Securities maturing, or subject to
tender at the option of the holder
<PAGE>

                                                                               7

thereof, within two years after the date of acquisition thereof, (ii) time
deposits and certificates of deposit of any commercial bank organized in the
United States having capital and surplus in excess of $500,000,000 or a
commercial bank organized under the law of any other country that is a member of
the OECD having total assets in excess of $500,000,000 (or its foreign currency
equivalent at the time) with a maturity date not more than one year from the
date of acquisition, (iii) repurchase obligations with a term of not more than
30 days for underlying securities of the types described in clause (i) above
entered into with (x) any bank meeting the qualifications specified in clause
(ii) above or (y) any primary government securities dealer reporting to the
Market Reports Division of the Federal Reserve Bank of New York, (iv) direct
obligations issued by any state of the United States of America or any political
subdivision of any such state or any public instrumentality thereof maturing, or
subject to tender at the option of the holder thereof, within 90 days after the
date of acquisition thereof, provided that, at the time of acquisition, the
                             --------
long-term debt of such state, political subdivision or public instrumentality
has a rating of A (or higher) from S&P or A-2 (or higher) from Moody's (or, if
at any time neither S&P nor Moody's shall be rating such obligations, then an
equivalent rating from such other nationally recognized rating service
acceptable to the Trustee), (v) commercial paper issued by the parent
corporation of any commercial bank organized in the United States having capital
and surplus in excess of $500,000,000 or a commercial bank organized under the
laws of any other country that is a member of the OECD having total assets in
excess of $500,000,000 (or its foreign currency equivalent at the time), and
commercial paper issued by others having one of the two highest ratings
obtainable from either S&P or Moody's (or, if at any time neither S&P nor
Moody's shall be rating such obligations, then from such other nationally
recognized rating service acceptable to the Trustee) and in each case maturing
within one year after the date of acquisition, (vi) overnight bank deposits and
bankers' acceptances at any commercial bank organized in the United States
having capital and surplus in excess of $500,000,000 or a commercial bank
organized under the laws of any other country that is a member of the OECD
having total assets in excess of $500,000,000 (or its foreign currency
equivalent at the time), (vii) deposits available for withdrawal on
<PAGE>

                                                                               8

demand with a commercial bank organized in the United States having capital and
surplus in excess of $500,000,000 or a commercial bank organized under the laws
of any other country that is a member of the OECD having total assets in excess
of $500,000,000 (or its foreign currency equivalent at the time) and (viii)
investments in money market funds substantially all of whose assets comprise
securities of the types described in clauses (i) through (vii).

     "Change of Control" has the meaning specified in Section 1009.

     "Change of Control Triggering Event" has the meaning specified in
Section 1009.

     "Code" means the Internal Revenue Code of 1986, as amended.

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

     "Common Stock" of any Person means Capital Stock of such Person that does
not rank prior, as to the payment of dividends or as to the distribution of
assets upon any voluntary or involuntary liquidation, dissolution or winding up
of such Person, to shares of Capital Stock of any other class of such Person.

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

     "Company Order" or "Company Request" means a written request or order
signed in the name of the Company by the Chairman of the Board of Directors, a
Vice Chairman of the Board of Directors, the President or a Vice President, and
by the Chief Financial Officer, the Chief Accounting Officer, the Treasurer, an
Assistant Treasurer, the
<PAGE>

                                                                               9

Controller, the Secretary or an Assistant Secretary of the Company and delivered
to the Trustee.

     "Consolidated Capital Ratio" means as of the date of determination the
ratio of (i) the aggregate amount of Debt of the Company and its Restricted
Subsidiaries on a consolidated basis as at the date of determination to (ii) the
sum of (a) $2,024,000,000, (b) the aggregate net proceeds to the Company from
the issuance or sale of any Capital Stock (including Preferred Stock) of the
Company other than Disqualified Stock subsequent to the Measurement Date, (c)
the aggregate net proceeds from the issuance or sale of Debt of the Company or
any Restricted Subsidiary subsequent to the Measurement Date convertible or
exchangeable into Capital Stock of the Company other than Disqualified Stock, in
each case upon conversion or exchange thereof into Capital Stock of the Company
subsequent to the Measurement Date and (d) the after-tax gain on the sale,
subsequent to the Measurement Date, of Special Assets to the extent such Special
Assets have been sold for cash, Cash Equivalents, Telecommunications/IS Assets
or the assumption of Debt of the Company or any Restricted Subsidiary (other
than Debt that is subordinated to the Securities or any applicable Restricted
Subsidiary Guarantee) and release of the Company and all Restricted Subsidiaries
from all liability on the Debt assumed; provided, however, that, for purposes of
                                        --------  -------
calculation of the Consolidated Capital Ratio, the net proceeds from the
issuance or sale of Capital Stock or Debt described in clause (b) or (c) above
shall not be included to the extent (x) such proceeds have been utilized to make
a Permitted Investment under clause (i) of the definition thereof or a
Restricted Payment or (y) such Capital Stock or Debt shall have been issued or
sold to the Company, a Subsidiary of the Company or an employee stock ownership
plan or trust established by the Company or any such Subsidiary for the benefit
of their employees.

     "Consolidated Cash Flow Available for Fixed Charges" for any period means
the Consolidated Net Income of the Company and its Restricted Subsidiaries for
such period increased by the sum of, to the extent reducing Consolidated Net
Income for such period, (i) Consolidated Interest Expense of the Company and its
Restricted Subsidiaries for such period, plus (ii) Consolidated Income Tax
Expense of the Company and its Restricted Subsidiaries for such period,
<PAGE>

                                                                              10

plus (iii) consolidated depreciation and amortization expense and any other non-
cash items (other than any such non-cash item to the extent that it represents
an accrual of or reserve for cash expenditures in any future period); provided,
                                                                      --------
however, that there shall be excluded therefrom the Consolidated Cash Flow
-------
Available for Fixed Charges (if positive) of any Restricted Subsidiary
(calculated separately for such Restricted Subsidiary in the same manner as
provided above for the Company) that is subject to a restriction which prevents
the payment of dividends or the making of distributions to the Company or
another Restricted Subsidiary to the extent of such restrictions.

     "Consolidated Income Tax Expense" for any period means the aggregate
amounts of the provisions for income taxes of the Company and its Restricted
Subsidiaries for such period calculated on a consolidated basis in accordance
with generally accepted accounting principles.

     "Consolidated Interest Expense" for any period means the interest expense
included in a consolidated income statement (excluding interest income) of the
Company and its Restricted Subsidiaries for such period in accordance with
generally accepted accounting principles, including without limitation or
duplication (or, to the extent not so included, with the addition of), (i) the
amortization of Debt discounts and issuance costs, including commitment fees;
(ii) any payments or fees with respect to letters of credit, bankers'
acceptances or similar facilities; (iii) net costs with respect to interest rate
swap or similar agreements or foreign currency hedge, exchange or similar
agreements (including fees); (iv) Preferred Stock Dividends (other than
dividends paid in shares of Preferred Stock that is not Disqualified Stock)
declared and paid or payable; (v) accrued Disqualified Stock Dividends, whether
or not declared or paid; (vi) interest on Debt guaranteed by the Company and its
Restricted Subsidiaries; (vii) the portion of any Capital Lease Obligation or
Sale and Leaseback Transaction paid during such period that is allocable to
interest expense; (viii) interest Incurred in connection with investments in
discontinued operations; and (ix) the cash contributions to any employee stock
ownership plan or similar trust to the extent such contributions are used by
such plan or trust to pay interest or fees to any
<PAGE>

                                                                              11

Person (other than the Company or a Restricted Subsidiary) in connection with
Debt Incurred by such plan or trust.

     "Consolidated Net Income" for any period means the net income (or loss) of
the Company and its Restricted Subsidiaries for such period determined on a
consolidated basis in accordance with generally accepted accounting principles;
provided that there shall be excluded therefrom (a) for purposes of Section 1012
--------
only, the net income (or loss) of any Person acquired by the Company or a
Restricted Subsidiary in a pooling-of-interests transaction for any period prior
to the date of such transaction, (b) the net income (or loss) of any Person that
is not a Restricted Subsidiary except to the extent of the amount of dividends
or other distributions actually paid to the Company or a Restricted Subsidiary
by such Person during such period (except, for purposes of Section 1012 only, to
the extent such dividends or distributions have been subtracted from the
calculation of the amount of Investments to support the actual making of
Investments), (c) gains or losses realized upon the sale or other disposition of
any Property of the Company or its Restricted Subsidiaries that is not sold or
disposed of in the ordinary course of business (it being understood that
Permitted Telecommunications Capital Asset Dispositions shall be considered to
be in the ordinary course of business), (d) gains or losses realized upon the
sale or other disposition of any Special Assets, (e) all extraordinary gains and
extraordinary losses, determined in accordance with generally accepted
accounting principles, (f) the cumulative effect of changes in accounting
principles, (g) non-cash gains or losses resulting from fluctuations in currency
exchange rates, (h) any non-cash expense related to the issuance to employees or
directors of the Company or any Restricted Subsidiary of (1) options to purchase
Capital Stock of the Company or such Restricted Subsidiary or (2) other
compensatory rights; provided, in either case, that such options or rights, by
                     --------
their terms can be redeemed at the option of the holder of such option or right
only for Capital Stock, and (i) with respect to a Restricted Subsidiary that is
not a Wholly Owned Subsidiary any aggregate net income (or loss) in excess of
the Company's or any Restricted Subsidiary's pro rata share of the net income
(or loss) of such Restricted Subsidiary that is not a Wholly Owned Subsidiary;
provided further that there shall further be excluded therefrom the net income
-------- -------
<PAGE>

                                                                              12

(but not net loss) of any Restricted Subsidiary that is subject to a restriction
which prevents the payment of dividends or the making of distributions to the
Company or another Restricted Subsidiary to the extent of such restriction.

     "Consolidated Net Worth" of any Person means the stockholders' equity of
such Person, determined on a consolidated basis in accordance with generally
accepted accounting principles, less amounts attributable to Disqualified Stock
of such Person.

     "Consolidated Tangible Assets" of any Person means the total amount of
assets (less applicable reserves and other properly deductible items) which
under generally accepted accounting principles would be included on a
consolidated balance sheet of such Person and its Subsidiaries after deducting
therefrom all goodwill, trade names, trademarks, patents, unamortized debt
discount and expense and other like intangibles, which in each case under
generally accepted accounting principles would be included on such consolidated
balance sheet.

     "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 of execution of this Indenture is located
at 101 Barclay Street, Floor 21W, New York, New York 10286.

     "Credit Agreement" means the Credit Agreement dated as of September 30,
1999, among the Company, certain subsidiaries of the Company, the lenders
parties thereto and The Chase Manhattan Bank, as Administrative Agent and
Collateral Agent.

     "Credit Facilities" means one or more credit agreements, loan agreements or
similar facilities, secured or unsecured, providing for revolving credit loans,
term loans and/or letters of credit, including the Credit Agreement and any
Qualified Receivable Facility, entered into from time to time by the Company and
its Restricted Subsidiaries, and including any related notes, Guarantees,
collateral documents, instruments and agreements executed in connection
therewith, as the same may be amended,
<PAGE>

                                                                              13

supplemented, modified, restated or replaced from time to time.

     "Debt" means (without duplication), with respect to any Person, whether
recourse is to all or a portion of the assets of such Person and whether or not
contingent, (i) every obligation of such Person for money borrowed, (ii) every
obligation of such Person evidenced by bonds, debentures, notes or other similar
instruments, including obligations incurred in connection with the acquisition
of Property, (iii) every reimbursement obligation of such Person with respect to
letters of credit, bankers' acceptances or similar facilities issued for the
account of such Person, (iv) every obligation of such Person issued or assumed
as the deferred purchase price of Property or services (including securities
repurchase agreements but excluding trade accounts payable or accrued
liabilities arising in the ordinary course of business), (v) every Capital Lease
Obligation of such Person and all Attributable Value in respect of Sale and
Leaseback Transactions entered into by such Person, (vi) all obligations to
redeem or repurchase Disqualified Stock issued by such Person, (vii) the
liquidation preference of any Preferred Stock (other than Disqualified Stock,
which is covered by the preceding clause (vi)) issued by any Restricted
Subsidiary of such Person, (viii) every obligation under Interest Rate or
Currency Protection Agreements of such Person and (ix) every obligation of the
type referred to in clauses (i) through (viii) of another Person and all
dividends of another Person the payment of which, in either case, such Person
has Guaranteed. The "amount" or "principal amount" of Debt at any time of
determination as used herein represented by (a) any Debt issued at a price that
is less than the principal amount at maturity thereof, shall be, except as
otherwise set forth herein, the Accreted Value of such Debt at such time or (b)
in the case of any Receivables sale constituting Debt, the amount of the
unrecovered purchase price (that is, the amount paid for Receivables that has
not been actually recovered from the collection of such Receivables) paid by the
purchaser (other than the Company or a Wholly Owned Restricted Subsidiary of the
Company) thereof. The amount of Debt represented by an obligation under an
Interest Rate or Currency Protection Agreement shall be equal to (x) zero if
such obligation has been Incurred pursuant to clause (x) of paragraph (b) of
<PAGE>

                                                                              14

Section 1010 or (y) the notional amount of such obligation if not Incurred
pursuant to such clause.

     "Default" means any event, act or condition the occurrence of which is, or
after notice or the passage of time or both would be, an Event of Default.

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

     "Depository" means The Depository Trust Company, its nominees and
successors.

     "Designation" and "Designation Amount" have the respective meanings
specified in Section 1020.

     "Disqualified Stock" of any Person means any Capital Stock of such Person
which, by its terms (or by the terms of any security into which it is
convertible or for which it is exchangeable), or upon the happening of any
event, matures or is mandatorily redeemable, pursuant to a sinking fund
obligation or otherwise, or is redeemable at the option of the holder thereof,
in whole or in part, on or prior to the final Stated Maturity of the Securities;
provided, however, that any Preferred Stock which would not constitute
--------  -------
Disqualified Stock but for provisions thereof giving holders thereof the right
to require the Company to repurchase or redeem such Preferred Stock upon the
occurrence of a change of control occurring prior to the final Stated Maturity
of the Securities shall not constitute Disqualified Stock if the change of
control provisions applicable to such Preferred Stock are no more favorable to
the holders of such Preferred Stock than the provisions applicable to the
Securities contained in Section 1009 and such Preferred Stock specifically
provides that the Company will not repurchase or redeem any such stock pursuant
to such provisions prior to the Company's repurchase of such Securities as are
required to be repurchased pursuant to Section 1009.

     "Disqualified Stock Dividends" means all dividends with respect to
Disqualified Stock of the Company held by Persons other than a Wholly Owned
Restricted Subsidiary. The amount of any such dividend shall be equal to the
quotient of such dividend divided by the difference between one and the
<PAGE>

                                                                              15

maximum statutory federal income tax rate (expressed as a decimal number between
1 and 0) applicable to the Company for the period during which such dividends
were paid.

         "Dollar Notes" means, collectively, the Company's 11% Senior Notes due
2008 in an aggregate principal amount not to exceed $800,000,000 and the
Company's 11 1/4% Senior Notes due 2010 in an aggregate principal amount not to
exceed $250,000,000.

         "Eligible Receivables" means, at any time, Receivables of the Company
and its Restricted Subsidiaries, as evidenced on the most recent quarterly
consolidated balance sheet of the Company as at a date at least 45 days prior to
such time, arising in the ordinary course of business of the Company or any
Restricted Subsidiary.

     "Euro Notes" means, collectively, the Company's 10 3/4% Senior Euro Notes
due 2008 in an aggregate principal amount not to exceed (Euro)500,000,000 and
the Company's 11 1/4% Senior Euro Notes due 2010 in an aggregate principal
amount not to exceed (Euro)300,000,000.

     "European Government Obligation" means direct non-callable obligations of,
or non-callable obligations permitted by, any state member of the European
Union, the payment or guarantee of which is secured by the pledge of the full
faith and credit of the respective nation, provided that such nation has a
                                           --------
credit rating at least equal to that of the highest rated member nation of the
member nations of the European Union.

     "European Union" means the state members to the third stage of economic and
monetary union pursuant to the Treaty of Rome establishing the European
Community, as amended by the Treaty on European Union, signed at Maastricht on
February 7, 1992, and the Treaty signed at Amsterdam on October 2, 1997.

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

     "Exchange Act" means the Securities Exchange Act of 1934, as amended (or
any successor act), and the rules and regulations thereunder (or respective
successors thereto).
<PAGE>

                                                                              16

     "Exchange Securities" has the meaning stated in the first recital of this
Indenture.

     "Excess Proceeds" has the meaning specified in Section 1016.

     "Existing Notes" means the 9 1/8% Senior Notes, the 10 1/2% Senior Discount
Notes and the 6% Convertible Notes.

     "Expiration Date" has the meaning specified in "Offer to Purchase" below.

     "Fair Market Value" means, with respect to any Property, the price that
could be negotiated in an arm's-length free market transaction, for cash,
between a willing seller and a willing buyer, neither of whom is under pressure
or compulsion to complete the transaction. Unless otherwise specified herein,
Fair Market Value shall be determined by the Board of Directors acting in good
faith and shall be evidenced by a Board Resolution delivered to the Trustee.

     "Federal Bankruptcy Code" means the Bankruptcy Act of Title 11 of the
United States Code, as amended from time to time.

     "Global Security" means a Rule 144A Global Security, an Institutional
Accredited Investor Global Security or a Regulation S Global Security, as the
case may be.

     "Government Securities" means direct obligations of, or obligations fully
and unconditionally guaranteed or insured by, the United States of America or
any agency or instrumentality thereof for the payment of which obligations or
guarantee the full faith and credit of the United States is pledged and which
are not callable or redeemable at the issuer's option (unless, for purposes of
the definition of "Cash Equivalents" only, the obligations are redeemable or
callable at a price not less than the purchase price paid by the Company or the
applicable Restricted Subsidiary, together with all accrued and unpaid interest
(if any) on such Government Securities).
<PAGE>

                                                                              17

     "Guarantee" by any Person means any obligation, direct or indirect,
contingent or otherwise, of such Person guaranteeing, or having the economic
effect of guaranteeing, any Debt of any other Person (the "primary obligor") in
any manner, whether directly or indirectly, and any obligation, direct or
indirect, contingent or otherwise, of such Person (i) to purchase or pay (or
advance or supply funds for the purchase or payment of) such Debt or to purchase
(or to advance or supply funds for the purchase of) any security for the payment
of such Debt, including any such obligations arising by virtue of partnership
arrangements or by agreements to keep-well, (ii) to purchase Property or
services or to take-or-pay for the purpose of assuring the holder of such Debt
of the payment of such Debt, (iii) to maintain working capital, equity capital
or other financial statement condition or liquidity of the primary obligor so as
to enable the primary obligor to pay such Debt or (iv) entered into for the
purpose of assuring in any other manner the obligee against loss in respect
thereof, in whole or in part (and "Guaranteed", "Guaranteeing" and "Guarantor"
shall have meanings correlative to the foregoing); provided, however, that the
                                                   --------  -------
Guarantee by any Person shall not include endorsements by such Person for
collection or deposit, in either case, in the ordinary course of business.

     "Guarantor" means a Restricted Subsidiary of the Company that has executed
a Restricted Subsidiary Guarantee, until a successor Person shall have become
such pursuant to the applicable provisions of this Indenture, and thereafter
"Guarantor" shall mean such successor Person.

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

     "Incur" means, with respect to any Debt or other obligation of any Person,
to create, issue, incur (by conversion, exchange or otherwise), assume,
Guarantee or otherwise become liable in respect of such Debt or other obligation
including the recording, as required pursuant to generally accepted accounting
principles or otherwise, of any such Debt or other obligation on the balance
sheet of such Person (and "Incurrence", "Incurred", "Incurrable" and "Incurring"
shall have meanings correlative to the foregoing); provided, however, that a
                                                   --------  -------
change in generally accepted accounting principles that results in an obligation
<PAGE>

                                                                              18

of such Person that exists at such time becoming Debt shall not be deemed an
Incurrence of such Debt and that neither the accrual of interest nor the
accretion of original issue discount shall be deemed an Incurrence of Debt. Debt
otherwise incurred by a Person before it becomes a Subsidiary of the Company
shall be deemed to have been Incurred at the time at which it becomes a
Subsidiary.

     "Indenture" means this instrument as originally executed and as it may from
time to time be supplemented or amended by one or more indentures supplemental
hereto entered into pursuant to the applicable provisions hereof.

     "Initial Purchasers" means Salomon Smith Barney Inc., Goldman, Sachs & Co.,
Morgan Stanley & Co. Incorporated, Chase Securities Inc., J.P. Morgan Securities
Inc., Credit Suisse First Boston Corporation, BNY Capital Markets, Inc. and
First Union Securities, Inc.

    "Initial Securities" has the meaning stated in the first recital of this
Indenture.

     "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act.

     "Institutional Accredited Investor Global Security" has the meaning
specified in Section 303.

     "Interest Payment Date" means the Stated Maturity of an installment of
interest on the Securities.

     "Interest Rate or Currency Protection Agreement" of any Person means any
forward contract, futures contract, swap, option or other financial agreement or
arrangement (including caps, floors, collars and similar agreements) relating
to, or the value of which is dependent upon, interest rates or currency exchange
rates or indices.

     "Invested Capital" means the sum of (a) $500,000,000, (b) the aggregate net
proceeds received by the Company from the issuance or sale of any Capital Stock,
including Preferred Stock, of the Company but excluding Disqualified Stock,
subsequent to the Measurement Date, and (c) the aggregate net proceeds from the
issuance or sale of Debt of
<PAGE>

                                                                              19

the Company or any Restricted Subsidiary subsequent to the Measurement Date
convertible or exchangeable into Capital Stock of the Company other than
Disqualified Stock, in each case upon conversion or exchange thereof into
Capital Stock of the Company subsequent to the Measurement Date; provided,
                                                                 --------
however, that the net proceeds from the issuance or sale of Capital Stock or
-------
Debt described in clause (b) or (c) shall be excluded from any computation of
Invested Capital to the extent (i) utilized to make a Restricted Payment or (ii)
such Capital Stock or Debt shall have been issued or sold to the Company, a
Subsidiary of the Company or an employee stock ownership plan or trust
established by the Company or any such Subsidiary for the benefit of their
employees.

     "Investment" by any Person means any direct or indirect loan, advance or
other extension of credit or capital contribution (by means of transfers of cash
or other Property to others or payments for Property or services for the account
or use of others, or otherwise) to, purchase, redemption, retirement or
acquisition of Capital Stock, bonds, notes, debentures or other securities or
evidence of Debt issued by, or Incurrence of, or payment on, a Guarantee of any
obligation of, any other Person; provided that Investments shall exclude
                                 --------
commercially reasonable extensions of trade credit. The amount, as of any date
of determination, of any Investment shall be the original cost of such
Investment, plus the cost of all additions, as of such date, thereto and minus
the amount, as of such date, of any portion of such Investment repaid to such
Person in cash as a repayment of principal or a return of capital, as the case
may be (except to the extent such repaid amount has been included in
Consolidated Net Income to support the actual making of Restricted Payments),
but without any other adjustments for increases or decreases in value, or write-
ups, write-downs or write-offs with respect to such Investment. In determining
the amount of any Investment involving a transfer of any Property other than
cash, such Property shall be valued at its Fair Market Value at the time of such
transfer.

    "Issue Date" means the date on which the Initial Securities are initially
issued.
<PAGE>

                                                                              20

     "Issue Date Purchase Money Debt" means Purchase Money Debt outstanding on
the Issue Date; provided, that the amount of such Purchase Money Debt when
                --------
Incurred did not exceed 100% of the cost of the construction, installation,
acquisition, lease, development or improvement of the applicable
Telecommunications/IS Assets.

     "Issue Date Rating" means B3 in the case of Moody's and B in the case of
S&P, which are the respective ratings assigned to the Securities by the Rating
Agencies on the Issue Date.

     "Joint Venture" means a Person in which the Company or a Restricted
Subsidiary holds not more than 50% of the shares of Voting Stock.

     "Lien" means, with respect to any Property, any mortgage or deed of trust,
pledge, hypothecation, assignment, deposit arrangement, security interest, lien,
charge, easement (other than any easement not materially impairing usefulness),
encumbrance, preference, priority or other security agreement or preferential
arrangement of any kind or nature whatsoever on or with respect to such Property
(including any Capital Lease Obligation, conditional sale or other title
retention agreement having substantially the same economic effect as any of the
foregoing and any Sale and Leaseback Transaction). For purposes of this
definition the sale, lease, conveyance or other transfer by the Company or any
of its Subsidiaries of, including the grant of indefeasible rights of use or
equivalent arrangements with respect to, dark or lit communications fiber
capacity or communications conduit shall not constitute a Lien.

     "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 or otherwise.

     "Measurement Date" means April 28, 1998, the date the 9-1/8% Senior Notes
were originally issued.
<PAGE>

                                                                              21

     "Moody's" means Moody's Investors Service, Inc. or, if Moody's Investors
Service, Inc. shall cease rating debt securities having a maturity at original
issuance of at least one year and such ratings business shall have been
transferred to a successor Person, such successor Person; provided, however,
                                                          --------  -------
that if Moody's Investors Service, Inc. ceases rating debt securities having a
maturity at original issuance of at least one year and its ratings business with
respect thereto shall not have been transferred to any successor Person, then
"Moody's" shall mean any other national recognized rating agency (other than
S&P) that rates debt securities having a maturity at original issuance of at
least one year and that shall have been designated by the Trustee by a written
notice given to the Company.

     "Net Available Proceeds" from any Asset Disposition by any Person means
cash or cash equivalents received (including amounts received by way of sale or
discounting of any note, installment receivable or other receivable, but
excluding any other consideration received in the form of assumption by the
acquiror of Debt or other obligations relating to such Property) therefrom by
such Person, net of (i) all legal, title and recording taxes, expenses and
commissions and other fees and expenses (including appraisals, brokerage
commissions and investment banking fees) Incurred and all federal, state,
provincial, foreign and local taxes required to be accrued as a liability as a
consequence of such Asset Disposition, (ii) all payments made by such Person or
its Subsidiaries on any Debt which is secured by such Property in accordance
with the terms of any Lien upon or with respect to such Property or which must
by the terms of such Lien, or in order to obtain a necessary consent to such
Asset Disposition or by applicable law, be repaid out of the proceeds from such
Asset Disposition, (iii) all distributions and other payments required to be
made to minority interest holders in Subsidiaries or Joint Ventures of such
Person as a result of such Asset Disposition and (iv) appropriate amounts to be
provided by such Person or any Subsidiary thereof, as the case may be, as a
reserve in accordance with generally accepted accounting principles against any
liabilities associated with such Property and retained by such Person or any
Subsidiary thereof, as the case may be, after such Asset Disposition, including
liabilities under any indemnification obligations and severance and other
employee termination
<PAGE>

                                                                              22

costs associated with such Asset Disposition, in each case as determined by the
board of directors of such Person, in its reasonable good faith judgment
evidenced by a Board Resolution filed with the Trustee; provided, however, that
                                                        --------  -------
any reduction in such reserve within twelve months following the consummation of
such Asset Disposition will be, for all purposes of this Indenture and the
Securities, treated as a new Asset Disposition at the time of such reduction
with Net Available Proceeds equal to the amount of such reduction; provided
                                                                   --------
further, however, that, in the event that any consideration for a transaction
-------  -------
(which would otherwise constitute Net Available Proceeds) is required to be held
in escrow pending determination of whether a purchase price adjustment will be
made, at such time as such portion of the consideration is released to such
Person or its Restricted Subsidiary from escrow, such portion shall be treated
for all purposes of this Indenture and the Securities as a new Asset Disposition
at the time of such release from escrow with Net Available Proceeds equal to the
amount of such portion of consideration released from escrow.

     "New Convertible Notes" means the Company's 6% Convertible Subordinated
Notes due 2010 in an aggregate principal amount not to exceed $862,500,000.

     "9-1/8% Senior Notes" means the Company's 9-1/8% Senior Notes Due 2008 in
an aggregate principal amount not to exceed $2,000,000,000, originally issued on
April 28, 1998.

     "Non-Global Purchasers" has the meaning specified in Section 303.

     "Offer" has the meaning specified in "Offer to Purchase" below.

     "Offer to Purchase" means a written offer (the "Offer") sent by the Company
by first-class mail, postage prepaid, to each Holder of Securities at its
address appearing in the Security Register on the date of the Offer offering to
purchase up to the principal amount at maturity of Securities specified in such
Offer at the purchase price specified in such Offer (as determined pursuant to
this Indenture). Unless otherwise required by applicable law, the Offer shall
specify an expiration date (the "Expiration Date") of the Offer to Purchase
which shall be, subject to
<PAGE>

                                                                              23

any contrary requirements of applicable law, not less than 30 days or more than
60 days after the date of such Offer and a settlement date (the "Purchase Date")
for purchase of Securities within five Business Days after the Expiration Date.
The Company shall notify the Trustee at least 15 Business Days (or such shorter
period as is acceptable to the Trustee) prior to the mailing of the Offer of the
Company's obligation to make an Offer to Purchase, and the Offer shall be mailed
by the Company or, at the Company's request, by the Trustee in the name and at
the expense of the Company. The Offer shall contain information concerning the
business of the Company and its Subsidiaries which the Company in good faith
believes will enable such Holders to make an informed decision with respect to
the Offer to Purchase (which at a minimum will include (i) the most recent
annual and quarterly financial statements and "Management's Discussion and
Analysis of Financial Condition and Results of Operations" contained in the
documents required to be filed with the Trustee pursuant to this Indenture
(which requirements may be satisfied by delivery of such documents together with
the Offer), (ii) a description of material developments in the Company's
business subsequent to the date of the latest of such financial statements
referred to in clause (i) (including a description of the events requiring the
Company to make the Offer to Purchase), (iii) if applicable, appropriate pro
forma financial information concerning the Offer to Purchase and the events
requiring the Company to make the Offer to Purchase and (iv) any other
information required by applicable law to be included therein). The Offer shall
contain all instructions and materials necessary to enable such Holders to
tender Securities pursuant to the Offer to Purchase. The Offer shall also state:

     a. the Section of this Indenture pursuant to which the Offer to Purchase is
being made;

     b. the Expiration Date and the Purchase Date;

     c. the aggregate principal amount at maturity of the Outstanding Securities
offered to be purchased by the Company pursuant to the Offer to Purchase
(including, if less than 100% of the Outstanding Securities, the manner by which
such has been determined pursuant to the
<PAGE>

                                                                              24

Section hereof requiring the Offer to Purchase) (the "Purchase Amount");

     d. the purchase price to be paid by the Company for $1,000 aggregate
principal amount at maturity of Securities accepted for payment (as specified
pursuant to this Indenture) (the "Purchase Price");

     e. that the Holder may tender all or any portion of the Securities
registered in the name of such Holder and that any portion of a Security
tendered must be tendered in an integral multiple of $1,000 principal amount at
maturity;

     f. the place or places where Securities are to be surrendered for tender
pursuant to the Offer to Purchase;

     g. that any Securities not tendered or tendered but not purchased by the
Company will continue to accrue interest or accrete principal, as the case may
be;

     h. that on the Purchase Date the Purchase Price will become due and payable
upon each Security being accepted for payment pursuant to the Offer to Purchase
and that interest thereon, if any, shall cease to accrue or the principal
thereon shall cease to accrete, as the case may be, on and after the Purchase
Date;

     i. that each Holder electing to tender a Security pursuant to the Offer to
Purchase will be required to surrender such Security at the place or places
specified in the Offer prior to the close of business on the Expiration Date
(such Security being, if the Company or the Trustee so requires, duly endorsed
by, or accompanied by 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);

     j. that Holders will be entitled to withdraw all or any portion of
Securities tendered if the Company (or the Paying Agent) receives, not later
than the close of business on the Expiration Date, a facsimile transmission or
letter setting forth the name of the Holder, the principal amount at maturity of
the Security the Holder tendered, the certificate number of the Security the
Holder tendered and a
<PAGE>

                                                                              25

statement that such Holder is withdrawing all or a portion of his tender;

     k. that (i) if Securities in an aggregate principal amount at maturity less
than or equal to the Purchase Amount are duly tendered and not withdrawn
pursuant to the Offer to Purchase, the Company shall purchase all such
Securities and (ii) if Securities in an aggregate principal amount at maturity
in excess of the Purchase Amount are tendered and not withdrawn pursuant to the
Offer to Purchase, the Company shall purchase Securities having an aggregate
principal amount at maturity equal to the Purchase Amount on a pro rata basis
                                                               --- ----
(with such adjustments as may be deemed appropriate so that only Securities in
denominations of $1,000 principal amount at maturity or integral multiples
thereof shall be purchased); and

     l. that in the case of any Holder whose Security is purchased only in part,
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
any authorized denomination as requested by such Holder, in an aggregate
principal amount at maturity equal to and in exchange for the unpurchased
portion of the Security so tendered.

     Any Offer to Purchase shall be governed by and effected in accordance with
the Offer for such Offer to Purchase.

     "Officers' Certificate" means a certificate signed by the Chairman of the
Board of Directors, a Vice Chairman of the Board of Directors, the President or
a Vice President, and by the Chief Financial Officer, the Chief Accounting
Officer, the Treasurer, an Assistant Treasurer, the Controller, the Secretary or
an Assistant Secretary of the Company and delivered to the Trustee, which shall
comply with this Indenture.

     "Opinion of Counsel" means an opinion of counsel acceptable to the Trustee
(who may be counsel to the Company, including an employee of the Company).

     "OECD" shall mean the Organization for Economic Cooperation and
Development.
<PAGE>

                                                                              26

     "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 cancelled by the Trustee or delivered to
     the Trustee for cancellation ;

          (ii) on and after any maturity or redemption date, Securities, or
     portions thereof, for whose payment or redemption money in the necessary
     amount has been theretofore deposited with the Trustee or any Paying Agent
     (other than the Company) in trust or set aside and segregated in trust by
     the Company (if the Company shall act as its own Paying Agent) for the
     Holders of such Securities; provided that (a) the Trustee or the Paying
                                 --------
     Agent, as applicable, is not prohibited from paying such money to the
     Holders and (b) if such Securities are to be redeemed, notice of such
     redemption has been duly given pursuant to this Indenture ;

          (iii) Securities, except to the extent provided in Sections 1202 and
     1203, with respect to which the Company has effected defeasance or covenant
     defeasance as provided in Article Twelve; 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 the Securities are valid obligations of the Company;

provided, however, that in determining whether the Holders of the requisite
--------- -------
principal amount at maturity of Outstanding Securities have given any request,
demand, authorization, direction, consent, notice or waiver hereunder, and for
the purpose of making the calculations required by TIA Section 313, Securities
owned by the Company or any other obligor upon the Securities or any Affiliate
of the Company or such other obligor shall be disregarded and deemed not to
<PAGE>

                                                                              27

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 any Responsible Officer of the Trustee knows to be so owned or as to which
the Trustee has received written notice 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 such other obligor.

     "Paying Agent" means any Person (including the Company acting as Paying
Agent) authorized by the Company to pay the Accreted Value of (and premium, if
any) or interest on any Securities on behalf of the Company.

     "Permitted Holders" means the members of the Company's Board of Directors
on the Measurement Date and their respective estates, spouses, ancestors, and
lineal descendants, the legal representatives of any of the foregoing and the
trustees of any bona fide trusts of which the foregoing are the sole
beneficiaries or the grantors, or any Person of which the foregoing
"beneficially owns" (as defined in Rule 13d-3 under the Exchange Act) at least
66-2/3% of the total voting power of the Voting Stock of such Person.

     "Permitted Interest Rate or Currency Protection Agreement" of any Person
means any Interest Rate or Currency Protection Agreement entered into with one
or more financial institutions in the ordinary course of business that is
designed to protect such Person against fluctuations in interest rates or
currency exchange rates with respect to Debt Incurred and not for purposes of
speculation and which, in the case of an interest rate agreement, shall have a
notional amount no greater than the principal amount at maturity due with
respect to the Debt being hedged thereby.

     "Permitted Investments" means (a) Cash Equivalents; (b) investments in
prepaid expenses; (c) negotiable instruments held for collection and lease,
utility and workers' compensation, performance and other similar
<PAGE>

                                                                              28

deposits; (d) loans, advances or extensions of credit to employees and directors
made in the ordinary course of business and consistent with past practice; (e)
obligations under Permitted Interest Rate or Currency Protection Agreements; (f)
bonds, notes, debentures and other securities received as a result of Asset
Dispositions pursuant to and in compliance with Section 1016; (g) Investments in
any Person as a result of which such Person becomes a Restricted Subsidiary; (h)
Investments made prior to the Measurement Date; (i) Investments made after the
Measurement Date in Persons engaged in the Telecommunications/IS Business in an
aggregate amount not to exceed Invested Capital; (j) solely in connection with
the defeasance of euro-denominated Debt permitted under this Indenture, European
Government Obligations; and (k) additional Investments in an aggregate amount
not to exceed $200,000,000.

     "Permitted Liens" means (a) Liens for taxes, assessments, governmental
charges, levies or claims which are not yet delinquent or which are being
contested in good faith by appropriate proceedings, if a reserve or other
appropriate provision, if any, as shall be required in conformity with generally
accepted accounting principles shall have been made therefor; (b) other Liens
incidental to the conduct of the Company's and its Restricted Subsidiaries'
businesses or the ownership of its Property not securing any Debt, and which do
not in the aggregate materially detract from the value of the Company's and its
Restricted Subsidiaries' Property when taken as a whole, or materially impair
the use thereof in the operation of its business; (c) Liens, pledges and
deposits made in the ordinary course of business in connection with workers'
compensation, unemployment insurance and other types of statutory obligations;
(d) Liens, pledges or deposits made to secure the performance of tenders, bids,
leases, public or statutory obligations, sureties, stays, appeals, indemnities,
performance or other similar bonds and other obligations of like nature incurred
in the ordinary course of business (exclusive of obligations for the payment of
borrowed money, the obtaining of advances or credit or the payment of the
deferred purchase price of Property and which do not in the aggregate materially
impair the use of Property in the operation of the business of the Company and
the Restricted Subsidiaries taken as a whole); (e) zoning
<PAGE>

                                                                              29

restrictions, servitudes, easements, rights-of-way, restrictions and other
similar charges or encumbrances incurred in the ordinary course of business
which, in the aggregate, do not materially detract from the value of the
Property subject thereto or materially interfere with the ordinary conduct of
the business of the Company or its Restricted Subsidiaries; and (f) any interest
or title of a lessor in the Property subject to any lease other than a Capital
Lease.

     "Permitted Telecommunications Capital Asset Disposition" means the
transfer, conveyance, sale, lease or other disposition of optical fiber and/or
conduit and any related equipment used in a Segment (as defined) of the
Company's communications network that (i) constitute capital assets in
accordance with generally accepted accounting principles and (ii) after giving
effect to such disposition, would result in the Company retaining at least
either (A) 24 optical fibers per route mile on such Segment as deployed at the
time of such disposition or (B) 12 optical fibers and one empty conduit per
route mile on such Segment as deployed as such time. "Segment" means (x) with
respect to the Company's intercity network, the through-portion of such network
between two local networks (i.e., Omaha to Denver) and (y) with respect to a
local network of the Company (i.e., Dallas), the entire through-portion of such
network, excluding the spurs which branch off the through-portion.

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

     "Physical Security" has the meaning specified in Section 303.

     "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 a mutilated
security or in lieu of a lost, destroyed or stolen Security shall be deemed to
evidence the same debt as the mutilated, lost, destroyed or stolen Security.
<PAGE>

                                                                              30

     "Preferred Stock" of any Person means Capital Stock of such Person of any
class or classes (however designated) that ranks prior, as to the payment of
dividends or as to the distribution of assets upon any voluntary or involuntary
liquidation, dissolution or winding-up of such Person, to shares of Capital
Stock of any other class of such Person.

     "Preferred Stock Dividends" means all dividends with respect to Preferred
Stock of Restricted Subsidiaries held by Persons other than the Company or a
Wholly Owned Restricted Subsidiary. The amount of any such dividend shall be
equal to the quotient of such dividend divided by the difference between one and
the maximum statutory federal income rate (expressed as a decimal number between
1 and 0) applicable to the issuer of such Preferred Stock for the period during
which such dividends were paid.

     "Private Exchange Offer" means the offer by the Company, pursuant to
Section 2(f) of the Registration Agreement, to issue and deliver to certain
purchasers, in exchange for the Initial Securities held by such purchasers as
part of their initial distribution, a like aggregate principal amount at
maturity of Private Exchange Securities.

     "Private Exchange Securities" means the Exchange Securities to be issued
pursuant to this Indenture in connection with a Private Exchange Offer pursuant
to the Registration Agreement.

     "Private Placement Legend" means the third paragraph of the legend set
forth in the Securities in the form set forth in Exhibit A.

     "Property" means, with respect to any Person, any interest of such Person
in any kind of property or asset, whether real, personal or mixed, or tangible
or intangible, including Capital Stock in, and other securities of, any other
Person. For purposes of any calculation required pursuant to this Indenture, the
value of any Property shall be its Fair Market Value.

     "Proportionate Interest" in any issuance of Capital Stock of a Restricted
Subsidiary means a ratio (i) the numerator of which is the aggregate amount of
all Capital
<PAGE>

                                                                              31

Stock of such Restricted Subsidiary beneficially owned by the Company and the
Restricted Subsidiaries and (ii) the denominator of which is the aggregate
amount of Capital Stock of such Restricted Subsidiary beneficially owned by all
Persons (excluding, in the case of this clause (ii), any Investment made in
connection with such issuance).

     "Purchase Amount" has the meaning specified in "Offer to Purchase" above.

     "Purchase Date" has the meaning specified in "Offer to Purchase" above.

     "Purchase Money Debt" means Debt (including Acquired Debt and Capital
Lease Obligations, mortgage financings and purchase money obligations) incurred
for the purpose of financing all or any part of the cost of construction,
installation, acquisition, lease, development or improvement by the Company or
any Restricted Subsidiary of any Telecommunications/IS Assets of the Company or
any Restricted Subsidiary and including any related notes, Guarantees,
collateral documents, instruments and agreements executed in connection
therewith, as the same may be amended, supplemented, modified or restated from
time to time.

     "Purchase Price" has the meaning specified in "Offer to Purchase"
above.

     "Qualified Institutional Buyer" or "QIB" has the meaning specified in
Rule 144A.

     "Qualified Receivable Facility" means Debt of the Company or any Subsidiary
Incurred from time to time pursuant to either (x) credit facilities secured by
Receivables or (y) Receivables purchase facilities, and including any related
notes, Guarantees, collateral documents, instruments and agreements executed in
connection therewith, as the same may be amended, supplemented, modified or
restated from time to time.

     "Rating Agencies" means Moody's and S&P.
<PAGE>

                                                                              32

     "Rating Date" means the earlier of the date of public notice of the
occurrence of a Change of Control or of the intention of the Company to effect a
Change of Control.

     "Rating Decline" shall be deemed to have occurred if, no later than 90 days
after the Rating Date (which period shall be extended so long as the rating of
the Securities is under publicly announced consideration for possible downgrade
by any of the Rating Agencies), either of the Rating Agencies assigns or
reaffirms a rating to the Securities that is lower than the applicable Issue
Date Rating (or the equivalent thereof). If, prior to the Rating Date, either of
the ratings assigned to the Securities by the Rating Agencies is lower than the
applicable Issue Date Rating, then a Rating Decline will be deemed to have
occurred if such rating is not changed by the 90th day following the Rating
Date. A downgrade within rating categories, as well as between rating
categories, will be considered a Rating Decline.

     "Receivables" means receivables, chattel paper, instruments, documents
or intangibles evidencing or relating to the right to payment of money and
proceeds and products thereof in each case generated in the ordinary course of
business.

     "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.

     "refinancing" has the meaning specified in Section 1010(b)(viii).

     "Registered Exchange Offer" means the offer by the Company, pursuant to
the Registration Agreement, to certain Holders of Initial Securities, to issue
and deliver to such Holders, in exchange for the Initial Securities, a like
aggregate principal amount at maturity of Exchange Securities registered under
the Securities Act.
<PAGE>

                                                                              33

     "Registration Agreement" means the U.S. Registration Agreement dated
February 24, 2000, between the Company and the Initial Purchasers relating to
the Initial Securities.

     "Registration Default" has the meaning specified in Exhibit A.

     "Regular Record Date" for the interest payable on any Interest Payment
Date means the March 1 or September 1 (whether or not a Business Day), as the
case may be, next preceding such Interest Payment Date.

     "Regulation S" means Regulation S under the Securities Act.

     "Regulation S Global Security" has the meaning specified in Section 303.

     "Required Filing Dates" has the meaning specified in Section 1007.

     "Responsible Officer", when used with respect to the Trustee, means any
officer within the Trustee's Corporate Trust Office, including any vice
president, any assistant secretary, any assistant treasurer, 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 his knowledge of and familiarity with the particular
subject.

     "Restricted Payment" has the meaning specified in Section 1012.

     "Restricted Subsidiary" means (a) a Subsidiary of the Company or of a
Restricted Subsidiary that has not been designated or classified as an
Unrestricted Subsidiary pursuant to and in compliance with Section 1020 and (b)
an Unrestricted Subsidiary that is redesignated as a Restricted Subsidiary
pursuant to such Section.

     "Restricted Subsidiary Guarantee" means a supplemental indenture to this
Indenture in substantially the form set forth in Exhibit B hereto, providing for
an unconditional Guarantee of payment in full of the Accreted Value of,
<PAGE>

                                                                              34

premium, if any, and interest on the Securities. Any such Restricted Subsidiary
Guarantee shall not be subordinate to any Debt of the Restricted Subsidiary
providing the Restricted Subsidiary Guarantee.

     "Revocation" has the meaning specified in Section 1020.

     "Rule 144A" means Rule 144A under the Securities Act.

     "Rule 144A Global Security" has the meaning specified in Section 303.

     "S&P" means Standard & Poor's Ratings Service or, if Standard & Poor's
Ratings Service shall cease rating debt securities having a maturity at original
issuance of at least one year and such ratings business shall have been
transferred to a successor Person, such successor Person; provided, however,
                                                          --------  -------
that if Standard & Poor's Rating Service ceases rating debt securities having a
maturity at original issuance of at least one year and its ratings business with
respect thereto shall not have been transferred to any successor Person, then
"S&P" shall mean any other national recognized rating agency (other than
Moody's) that rates debt securities having a maturity at original issuance of at
least one year and that shall have been designated by the Trustee by a written
notice given to the Company.

     "Sale and Leaseback Transaction" of any Person means any direct or
indirect arrangement pursuant to which any Property is sold or transferred by
such Person or a Restricted Subsidiary of such person and is thereafter leased
back from the purchaser or transferee thereof by such Person or one of its
Restricted Subsidiaries. The stated maturity of such arrangement shall be the
date of the last payment of rent or any other amount due under such arrangement
prior to the first date on which such arrangement may be terminated by the
lessee without payment of a penalty.

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

                                                                              35

     "Securities Act" means the Securities Act of 1933, as amended (or any
successor act), and the rules and regulations thereunder (or respective
successors thereto).

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

     "Shelf Registration Statement" means a registration statement issued by
the Company in connection with the offer and sale of Initial Securities pursuant
to the Registration Agreement.

     "Significant Subsidiary" means any Subsidiary that would be a "Significant
Subsidiary" of the Company within the meaning of Rule 1-02 under Regulation S-X
promulgated by the Commission.

     "6% Convertible Notes" means the Company's 6% Convertible Subordinated
Notes due 2009 in an aggregate principal amount not to exceed $823,000,000,
originally issued on September 14, 1999.

     "Special Assets" means (a) the Capital Stock or assets of Cable Michigan,
Inc., RCN Corporation, Commonwealth Telephone Enterprises, Inc., KCP, Inc. and
California Private Transportation Company, L.P. (and any intermediate holding
companies or other entities formed solely for the purpose of owning such Capital
Stock or assets) owned, directly or indirectly, by the Company or any Restricted
Subsidiary on the Measurement Date, and (b) any Property, other than cash, Cash
Equivalents and Telecommunications/IS Assets, received as consideration for the
disposition after the Measurement Date of Special Assets (as contemplated by the
first proviso in Section 1016).

     "Special Interest" has the meaning specified in Exhibit A.

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

     "Stated Maturity" when used with respect to a Security or any
installment of interest thereon, means the date specified in such Security as
the fixed date on which the
<PAGE>

                                                                              36

Accreted Value of such Security or such installment of interest is due and
payable, including pursuant to any mandatory redemption provision (but excluding
any provision providing for the repurchase of such Security at the option of the
Holder thereof upon the happening of any contingency beyond the control of the
Company unless such contingency has occurred).

     "Subordinated Debt" means Debt of the Company (a) that is not secured by
any Lien on or with respect to any Property now owned or acquired after the
Measurement Date and (b) as to which the payment of principal of (and premium,
if any) and interest and other payment obligations in respect of such Debt shall
be subordinate to the prior payment in full in cash of the Securities to at
least the following extent: (i) no payments of principal of (or premium, if any)
or interest on or otherwise due (including by acceleration or for additional
amounts) in respect of, or repurchases, redemptions or other retirements of,
such Debt (collectively, "payments of such Debt") may be permitted for so long
as any default (after giving effect to any applicable grace periods) in the
payment of principal (or premium, if any) or interest on the Securities exists,
including as a result of acceleration; (ii) in the event that any other Default
exists with respect to the Securities, upon notice by Holders of 25% or more in
aggregate principal amount of the Securities to the Trustee, the Trustee shall
have the right to give notice to the Company and the holders of such Debt (or
trustees or agents therefor) of a payment blockage, and thereafter no payments
of such Debt may be made for a period of 179 days from the date of such notice,
provided that not more than one such payment blockage notice may be given in any
--------
consecutive 360-day period, irrespective of the number of defaults with respect
to the Securities during such period; (iii) if payment of such Debt is
accelerated when any Securities are Outstanding, no payments of such Debt may be
made until three Business Days after the Trustee receives notice of such
acceleration and, thereafter, such payments may only be made to the extent the
terms of such Debt permit payment at that time; and (iv) such Debt may not (x)
provide for payments of principal of such Debt at the stated maturity thereof or
by way of a sinking fund applicable thereto or by way of any mandatory
redemption, defeasance, retirement or
<PAGE>

                                                                              37

repurchase thereof by the Company (including any redemption, retirement or
repurchase which is contingent upon events or circumstances but excluding any
retirement required by virtue of acceleration of such Debt upon an event of
default thereunder), in each case prior to the final Stated Maturity of the
Securities or (y) permit redemption or other retirement (including pursuant to
an offer to purchase made by the Company) of such other Debt at the option of
the holder thereof prior to the final Stated Maturity of the Securities, other
than, in the case of clause (x) or (y), any such payment, redemption or other
retirement (including pursuant to an offer to purchase made by the Company)
which is conditioned upon (A) a change of control of the Company pursuant to
provisions substantially similar to those described in Section 1009 (and which
shall provide that such Debt will not be repurchased pursuant to such provisions
prior to the Company's repurchase of the Securities required to be repurchased
by the Company pursuant to the provisions described in Section 1009) or (B) a
sale or other disposition of assets pursuant to provisions substantially similar
to those described in Section 1016 (and which shall provide that such Debt will
not be repurchased pursuant to such provisions prior to the Company's repurchase
of the Securities required to be repurchased by the Company pursuant to the
provision described in Section 1016).

     "Subsidiary" of any Person means (i) a corporation more than 50% of the
combined voting power of the outstanding Voting Stock of which is owned,
directly or indirectly, by such Person or by one or more other Subsidiaries of
such Person or by such Person and one or more Subsidiaries thereof or (ii) any
other Person (other than a corporation) in which such Person, or one or more
other Subsidiaries of such Person or such Person and one or more other
Subsidiaries thereof, directly or indirectly, has at least a majority ownership
and power to direct the policies, management and affairs thereof.

     "Telecommunications/IS Assets" means (a) any Property (other than cash,
cash equivalents and securities) to be owned by the Company or any Restricted
Subsidiary and used in the Telecommunications/IS Business; (b) for purposes of
Sections 1010 and 1014 only, Capital Stock of any Person; or (c) for all other
purposes of this Indenture, Capital Stock of a Person that becomes a Restricted
Subsidiary as a result
<PAGE>

                                                                              38

of the acquisition of such Capital Stock by the Company or another Restricted
Subsidiary from any Person other than an Affiliate of the Company; provided,
                                                                   --------
however, that, in the case of clause (b) or (c), such Person is primarily
-------
engaged in the Telecommunications/IS Business.

     "Telecommunications/IS Business" means the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data through
owned or leased transmission facilities, (ii) constructing, creating, developing
or marketing communications networks, related network transmission equipment,
software and other devices for use in a communications business, (iii) computer
outsourcing, data center management, computer systems integration, reengineering
of computer software for any purpose (including, without limitation, for the
purposes of porting computer software from one operating environment or computer
platform to another or to address issues commonly referred to as "Year 2000
issues") or (iv) evaluating, participating or pursuing any other activity or
opportunity that is primarily related to those identified in (i), (ii) or (iii)
above; provided that the determination of what constitutes a
       --------
Telecommunications/IS Business shall be made in good faith by the Board of
Directors.

     "10 1/2% Senior Discount Notes" means the Company's 10 1/2% Senior
Discount Notes due 2008 in an aggregate principal amount at maturity not to
exceed $833,815,000, originally issued on November 24, 1998.

     "Trust Indenture Act" or "TIA" means the Trust Indenture Act of 1939 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
such successor Trustee.

     "Unrestricted Subsidiary" means (a) 91 Holding Corp.; (b) any Subsidiary of
an Unrestricted Subsidiary; and (c) any Subsidiary of the Company designated as
such pursuant to and in compliance with Section 1020 and not
<PAGE>

                                                                              39

thereafter redesignated as a Restricted Subsidiary as permitted pursuant
thereto.

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

     "Voting Stock" of any Person means Capital Stock of such Person which
ordinarily has voting power for the election of directors (or persons performing
similar functions) of such Person, whether at all times or only for so long as
no senior class of securities has such voting power by reason of any
contingency.

     "Wholly Owned Subsidiary" of any Person means a Subsidiary of such
Person all of the outstanding Voting Stock or other ownership interests (other
than directors' qualifying shares) of which shall at the time be owned by such
Person or by one or more Wholly Owned Subsidiaries of such Person or by such
Person and one or more Wholly Owned Subsidiaries of such Person.

     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 (including any covenant compliance with which
constitutes a condition precedent) 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 shall include:
<PAGE>

                                                                              40

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

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

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

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

     SECTION 103.  Form of Documents Delivered to Trustee.
                   ---------------------------------------

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

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

                                                                              41

should know, that the certificate or opinion or representations with respect to
such matters are erroneous.

     Where any Person is required to make, give or execute two or more
applications, requests, consents, certificates, statements, opinions or other
instruments under this Indenture, they may, but need not, be consolidated (with
proper identification of each matter covered therein) 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 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;
and, except as herein otherwise expressly provided, such action shall become
effective when such instrument or instruments are delivered to the Trustee and,
where it is hereby expressly required, to the Company. Such instrument or
instruments (and the action embodied therein and evidenced thereby) are herein
sometimes referred to as the "Act" of the Holders signing such instrument or
instruments. Proof of execution of any such instrument or of a writing
appointing any such agent shall be sufficient for any purpose of this Indenture
and (subject to Section 601) conclusive in favor of the Trustee and the Company,
if made in the manner provided in this Section.

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

                                                                              42

     (c)  The principal amount at maturity and serial numbers of Securities held
by any Person, and the date of holding the same, shall be proved by the Security
Register.

     (d)  If the Company shall solicit from the Holders of Securities any
request, demand, authorization, direction, notice, consent, waiver or other Act,
the Company may, at its option, by 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 six months
after the record date.

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

                                                                              43

Security if the Trustee receives the notice of revocation before the date such
Act becomes effective.

     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, Attention: Corporate
     Trust Trustee Administration, or

          (2)  the Company or any Guarantor 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 or such Guarantor addressed to it (in the case of a
     Guarantor, in care of the Company) at the address of the Company's
     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.

     SECTION 106.  Notice to Holders; Waiver.
                   --------------------------

     Where this Indenture provides for notice of any event to Holders by the
Company or the Trustee, such notice shall be given (unless otherwise herein
expressly provided) if in writing and mailed, first-class postage prepaid, to
each Holder affected by such event, at the address of such Holder 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 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. Notices shall be
effective only upon receipt. 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
<PAGE>

                                                                              44

the equivalent of such notice. Waivers of notice by Holders shall be filed with
the Trustee, but such filing shall not be a condition precedent to the validity
of any action taken in reliance upon such waiver.

     In case by reason of the suspension of or irregularities in regular mail
service or by reason of any other cause, it shall be impracticable to mail
notice of any event to Holders when such notice is required to be given pursuant
to any provision of this Indenture, then any manner of giving such notice as
shall be satisfactory to the Trustee shall be deemed to be a sufficient giving
of such notice for every purpose hereunder.

     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 bind
its successors and assigns, whether so expressed or not.

     SECTION 109.  Separability Clause.
                   --------------------

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

     SECTION 110.  Benefits of Indenture.
                   ----------------------

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

     SECTION 111.  Governing Law.
                   --------------
<PAGE>

                                                                              45

     THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK BUT WITHOUT GIVING EFFECT TO
APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF
THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

     SECTION 112.  Conflict with Trust Indenture Act.
                   ----------------------------------

     The Trust Indenture Act shall apply as a matter of contract to this
Indenture for purposes of interpretation, construction and defining the rights
and obligations hereunder. If any provision hereof limits, qualifies or
conflicts with any provision of the Trust Indenture Act or another provision
which is required or deemed to be included in this Indenture by any of the
provisions of the Trust Indenture Act, such provision or requirement of the
Trust Indenture Act shall control.

     If any provision of this Indenture modifies or excludes any provision
of the Trust Indenture Act that may be so modified or excluded, the latter
provision shall be deemed to apply to this Indenture as so modified or excluded,
as the case may be.

     SECTION 113.  Legal Holidays.
                   ---------------

     In any case where any Interest Payment Date, Redemption Date, or Stated
Maturity or Maturity of any Security shall not be a Business Day, then
(notwithstanding any other provision of this Indenture or of the Securities)
payment of Accreted Value (or premium, if any) or interest need not be made on
such date, but may be made on the next succeeding Business Day with the same
force and effect as if made on the Interest Payment Date or Redemption Date or
at the Stated Maturity or Maturity; provided that no interest shall accrue for
                                    --------
the period from and after such Interest Payment Date, Redemption Date, Stated
Maturity or Maturity, as the case may be.

     SECTION 114.  No Personal Liability of Directors, Officers, Employees and
                   -----------------------------------------------------------
Stockholders.
-------------

     No director, officer, employee, incorporator or stockholder of the
Company or any Guarantor, as such, shall have any liability for any obligations
of the Company or any
<PAGE>

                                                                              46

Guarantor under the Securities or this Indenture or for any claim based on, in
respect of, or by reason of, such obligations or their creation, solely by
reason of its status as a director, officer, employee, incorporator or
stockholder of the Company or a Guarantor. By accepting a Security, each Holder
waives and releases all such liability (but only such liability). The waiver and
release are part of the consideration for issuance of the Securities.

     SECTION 115.  Independence of Covenants.
                   --------------------------

     All covenants and agreements in this Indenture shall be given
independent effect so that if a particular action or condition is not permitted
by any of such covenants, the fact that it would be permitted by an exception
to, or be otherwise within the limitations of, another covenant shall not avoid
the occurrence of a Default if such action is taken or condition exists.

     SECTION 116.  Exhibits.
                   ---------

     All exhibits attached hereto are by this reference made a part hereof
with the same effect as if herein set forth in full.

     SECTION 117.  Counterparts.
                   -------------

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

     SECTION 118.  Duplicate Originals.
                   --------------------

     The parties may sign any number of copies of this Indenture. Each
signed copy shall be an original, but all of them together represent the same
agreement.
<PAGE>

                                                                              47

                                  ARTICLE TWO

                                SECURITY FORMS

     SECTION 201.  Forms Generally.
                   ----------------

     The Securities and the Trustee's certificate of authentication with
respect thereto shall be in substantially the form set forth in Exhibit A
hereto, with such appropriate insertions, omissions, substitutions and other
variations as are required or permitted by this Indenture, and may have such
letters, numbers or other marks of identification and such legends or
endorsements placed thereon as may be required to comply with the rules of any
securities exchange or system on which the Securities may be listed or eligible
for trading or as may, consistently herewith, be determined by the officers
executing such Securities, as evidenced by their execution of the Securities.
Any portion of the text of any Security may be set forth on the reverse thereof,
with an appropriate reference thereto on the face of the Security.

     The definitive Securities shall be printed, lithographed or engraved on
steel-engraved borders or may be produced in any other manner permitted by the
rules of any securities exchange or system on which the Securities may be listed
or eligible for trading, all as determined by the officers of the Company
executing such Securities, as evidenced by their execution of such Securities.

                                 ARTICLE THREE

                                THE SECURITIES

     SECTION 301.  Title and Terms.
                   ----------------

     The aggregate principal amount at maturity of Securities which may be
authenticated and delivered under this Indenture is limited to $675,000,000,
except for Securities authenticated and delivered upon registration of transfer
of, or in exchange for, or in lieu of, other Securities pursuant to Section 304,
305, 306, 906, 1009, 1016 or 1108.
<PAGE>

                                                                              48

     The Securities shall be known and designated as the "12 7/8% Senior
Discount Notes Due 2010" of the Company. Their Stated Maturity shall be March
15, 2010. The Securities shall be issued at a discount price of 53.308% of their
aggregate principal amount at maturity, and shall accrete at a rate of 12 7/8%
per annum, compounded semiannually, to 100% of their aggregate principal amount
at maturity by March 15, 2005. On March 15, 2005, cash interest shall commence
accruing at a rate of 12 7/8% per annum, which shall be payable semiannually in
arrears on March 15 and September 15 in each year, commencing on September 15,
2005, and at said Stated Maturity, until the principal thereof is paid or duly
provided for. Notwithstanding the foregoing, with respect to Initial Securities,
if there has been a Registration Default the Initial Securities shall from the
date of such Registration Default bear Special Interest up to but excluding the
date on which such Registration Default is cured, as set forth or referred to in
the text of the Securities appearing in Exhibit A hereto. Accrued Special
Interest, if any, shall be paid in cash in arrears semi-annually on March 15 and
September 15 in each year, and the amount of accrued Special Interest shall be
determined on the basis of the number of days actually elapsed. In addition, the
Company may elect, upon not less than 60 days prior notice given in the manner
provided for in Section 106, to commence the accrual of cash interest on all
Outstanding Securities on or after March 15, 2003, in which case the outstanding
principal amount at maturity of each Security shall on such commencement date be
reduced to the Accreted Value of such Security as of such commencement date and
cash interest shall be payable with respect to such Security on each March 15
and September 15 thereafter, as set forth or referred to in the text of the
Securities.

     Accreted Value of, premium, if any, and interest on the Securities will
be payable, and the Securities may be exchanged or transferred, at the office or
agency of the Company in The City of New York, which, unless otherwise provided
by the Company, will be the offices of the Trustee. At the option of the
Company, interest may be paid by check mailed to addresses of the Persons
entitled thereto as such addresses shall appear on the Security Register.
<PAGE>

                                                                              49

     The interest rate on the Securities is subject to increase by the addition
of Special Interest and otherwise, all as set forth or referred to in the text
of the Securities appearing in Exhibit A hereto.

     The Securities shall be redeemable as provided in Article Eleven.

     At the election of the Company, the entire Debt on the Securities or
certain of the Company's obligations and covenants and certain Events of Default
thereunder may be defeased as provided in Article Twelve.

     SECTION 302.  Denominations.
                   --------------

     The Securities will be issued without coupons and in fully registered
form only, in minimum denominations of $1,000 principal amount at maturity and
integral multiples thereof.

     SECTION 303.  Execution, Authentication, Delivery and Dating.
                   -----------------------------------------------

     The Securities shall be executed on behalf of the Company by its
Chairman, its President or a Vice President, under its corporate seal reproduced
thereon and attested by its Secretary or an Assistant Secretary. The signature
of any of these officers on the Securities 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 bearing the manual or facsimile signatures of individuals who
were at any time the proper officers of the Company shall bind the Company,
notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Securities or did not
hold such offices at the date of such Securities.

         At any time and from time to time after the execution and delivery of
this Indenture, the Company may deliver Securities executed by the Company to
the Trustee for authentication, together with a Company Order for the
authentication and delivery of such Securities, and the
<PAGE>

                                                                              50

Trustee in accordance with such Company Order shall authenticate and deliver
such Securities.

     Each Security shall be dated the date of its authentication.

     No Security shall be entitled to any benefit under this Indenture or be
valid or obligatory for any purpose unless there appears on such Security a
certificate of authentication substantially in the form provided for herein duly
executed by the Trustee by manual signature of an authorized signatory, 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.

     The Trustee shall authenticate and deliver (1) initially one or more Global
Securities for original issue in an aggregate principal amount at maturity not
to exceed $675,000,000 and (2) Exchange Securities for issue only in a
Registered Exchange Offer or a Private Exchange Offer pursuant to the
Registration Agreement, for a like principal amount at maturity of Initial
Securities, upon receipt of a Company Order, which shall specify the amount of
Securities to be authenticated, whether the Securities are to be Initial
Securities or Exchange Securities, the date on which such Securities are to be
authenticated and direct the Trustee to authenticate such Securities.

     Except as described below, the Securities will be deposited with, or on
behalf of, the Depository, and registered in the name of Cede & Co. as the
Depository's nominee in the form of a global note certificate substantially in
the form of Exhibit A (the "Rule 144A Global Security"), for credit to the
respective accounts of the beneficial owners of the Securities represented
thereby.

     Securities transferred to persons outside the United States in
accordance with Regulation S under the Securities Act shall be deposited with,
or on behalf of, the Depository, and registered in the name of Cede & Co. as the
Depository's nominee in the form of one or more global note certificates
substantially in the form of Exhibit A (each a "Regulation S Global Security"),
for credit to the respective accounts of the beneficial owners of the
<PAGE>

                                                                              51

Securities represented thereby, provided that upon such deposit all such
                                --------
Securities shall be credited to or through accounts maintained at the Depository
by or on behalf of the Euroclear System or Clearstream, societe anonyme.

     Securities transferred to Institutional Accredited Investors will be
deposited with, or on behalf of, the Depository, and registered in the name of
Cede & Co. as the Depository's nominee in the form of one or more global note
certificates substantially in the form of Exhibit A (each a "Institutional
Accredited Investor Global Security"), for credit to the respective accounts of
the beneficial owners of the Securities represented thereby.

     Securities transferred to any persons who are not Qualified Institutional
Buyers or Institutional Accredited Investors (other than persons outside the
United States pursuant to sales or transfers in accordance with Regulation S
under the Securities Act) (collectively, "Non-Global Purchasers") will be issued
in registered definitive form without coupons substantially in the form of
Exhibit A (the "Physical Securities"). Upon the transfer to a Qualified
Institutional Buyer, an Institutional Accredited Investor or to a person outside
the United States pursuant to a sale or transfer in accordance with Regulation S
under the Securities Act of Physical Securities initially issued to a Non-Global
Purchaser, such Physical Security will be exchanged for an interest in a Global
Security representing the principal amount at maturity of Securities being
transferred.

     In case the Company, pursuant to Article Eight, shall be consolidated
or merged with or into any other Person or shall transfer, sell, lease, convey
or otherwise dispose of all or substantially all its assets to any other Person,
and the successor Person resulting from such consolidation, or surviving such
merger, or into which the Company shall have been merged, or the Person which
shall have received a transfer, sale, lease, conveyance or other disposition as
aforesaid, shall have executed an indenture supplemental hereto with the Trustee
pursuant to Article Eight, any of the Securities authenticated or delivered
prior to such consolidation, merger, transfer, sale, lease, conveyance or other
disposition may, from time to time, at the request of the successor Person, be
exchanged for other Securities
<PAGE>

                                                                              52

executed in the name of the successor Person with such changes in phraseology
and form as may be appropriate, but otherwise in substance of like tenor as the
Securities surrendered for such exchange and of like principal amount at
maturity; and the Trustee, upon Company Request of the successor Person, shall
authenticate and deliver Securities as specified in such request for the purpose
of such exchange. If Securities shall at any time be authenticated and delivered
in any new name of a successor Person pursuant to this Section in exchange or
substitution for or upon registration of transfer of any Securities, such
successor Person, at the option of the Holders but without expense to them,
shall provide for the exchange of all Securities at the time Outstanding for
Securities authenticated and delivered in such new name.

     SECTION 304.  Temporary Securities.
                   ---------------------

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

     If temporary Securities are issued, the Company will cause definitive
Securities to be prepared without unreasonable delay. After the preparation of
definitive Securities, the temporary Securities shall be exchangeable for
definitive Securities upon surrender of the temporary Securities at the office
or agency of the Company designated for such purpose pursuant to Section 1002,
without charge to the Holder. Upon surrender for cancellation of any one or more
temporary Securities, the Company shall execute and the Trustee shall
authenticate and deliver in exchange therefor a like principal amount at
maturity of definitive Securities of authorized denominations. Until so
exchanged, the temporary Securities shall in all respects be entitled to the
same benefits under this Indenture as definitive Securities.
<PAGE>

                                                                           53

     SECTION 305.  Registration, Registration of Transfer and Exchange.
                   ----------------------------------------------------

     The Company shall cause to be kept at the Corporate Trust Office of the
Trustee a register (the register maintained in such office and in any other
office or agency designated pursuant to Section 1002 being herein sometimes
referred to as the "Security Register") in which, subject to such reasonable
regulations as the Company may prescribe, the Company shall provide for the
registration of Securities and of transfers of Securities. The Security Register
shall be in written form or any other form capable of being converted into
written form within a reasonable time. At all reasonable times, the Security
Register shall be open to inspection by the Trustee. The Trustee is hereby
initially appointed as security registrar (the "Security Registrar") for the
purpose of registering Securities and transfers of Securities as herein
provided.

     Upon surrender for registration of transfer of any Security at the
office or agency of the Company designated pursuant to Section 1002, the Company
shall execute, and the Trustee shall authenticate and deliver, in the name of
the designated transferee or transferees, one or more new Securities of any
authorized denomination or denominations of a like aggregate principal amount at
maturity.

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

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

     Every Security presented or surrendered for registration of transfer or
for exchange shall (if so
<PAGE>

                                                                           54

required by the Company 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 transfer tax or other similar 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, 1009, 1016 or
1108 not involving any transfer.

     The Company shall not be required (i) to issue, register the transfer
of or exchange any Security during a period beginning at the opening of business
15 days before the selection of Securities to be redeemed under Section 1104 and
ending at the close of business on the day of such mailing of the relevant
notice of redemption or (ii) to register the transfer of or exchange any
Security so selected for redemption in whole or in part, except the unredeemed
portion of any Security being redeemed in part.

     SECTION 306.  Mutilated, Destroyed, Lost and Stolen Securities.
                   -------------------------------------------------

     If (i) any mutilated Security is surrendered to the Trustee or (ii) the
Company and the Trustee receive evidence to their satisfaction of the
destruction, loss or theft of any Security, and there is delivered to the
Company and the Trustee such security or indemnity sufficient to save each of
them harmless, then, in the absence of actual notice to the Company or the
Trustee that such Security has been acquired by a bona fide purchaser, the
Company shall execute and upon Company Order the Trustee shall authenticate and
deliver, in exchange for any such mutilated Security or in lieu of any such
destroyed, lost or stolen Security, a new Security of like tenor and principal
amount at maturity, bearing a number not contemporaneously outstanding.

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

                                                                           55

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

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

     SECTION 307.  Payment of Interest; Interest Rights Preserved.
                   -----------------------------------------------

     Interest on any Security which is payable, and is punctually paid or
duly provided for, on any Interest Payment Date shall be paid to the Person in
whose name such 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 may at the Company's
      --------  -------
option be paid by 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 in the Security Register.
<PAGE>

                                                                           56

     Any interest on any Security which is payable, but is not punctually
paid or duly provided for, on any Interest Payment Date shall forthwith cease to
be payable to the Holder on the Regular Record Date by virtue of such Holder
having been a Holder on the Regular Record Date, and such defaulted interest and
(to the extent lawful) interest on such defaulted interest at the rate borne by
the Securities (such defaulted interest and interest thereon herein collectively
called "Defaulted Interest") may be paid by the Company, at its election in each
case, as provided in paragraph (1) or (2) below:
<PAGE>

                                                                           57

          (1)  The Company may elect to make payment of any Defaulted Interest
     to the Persons in whose names the Securities (or their respective
     Predecessor Securities) are registered at the close of business on a
     Special Record Date for the payment of such Defaulted Interest, which shall
     be fixed in the following manner. The Company shall notify the Trustee in
     writing of the amount of Defaulted Interest proposed to be paid on each
     Security and the date of the proposed payment, and at the same time the
     Company shall deposit with the Trustee an amount of money equal to the
     aggregate amount proposed to be paid in respect of such Defaulted Interest
     or shall make arrangements satisfactory to the Trustee for such deposit
     prior to the date of the proposed payment, such money when deposited to be
     held in trust for the benefit of the Persons entitled to such Defaulted
     Interest as in this clause provided. Thereupon the Trustee shall fix a
     Special Record Date for the payment of such Defaulted Interest which shall
     be not more than 15 days and not less than 10 days prior to the date of the
     proposed payment and not less than 10 days after the receipt by the Trustee
     of the notice of the proposed payment. The Trustee shall promptly notify
     the Company of such Special Record Date, and in the name and at the expense
     of the Company, shall cause notice of the proposed payment of such
     Defaulted Interest and the Special Record Date therefor to be given in the
     manner provided for in Section 106, not less than 10 days prior to such
     Special Record Date. Notice of the proposed payment of such Defaulted
     Interest and the Special Record Date therefor having been so given, such
     Defaulted Interest shall be paid to the Persons in whose names the
     Securities (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 paragraph (2).

          (2)  The Company may make payment of any Defaulted Interest in
     any other lawful manner not inconsistent with the requirements of any
     securities exchange or system on which the Securities may be listed or
     eligible for trading, and upon such notice as may be required by such
     exchange or system, if, after notice given by the Company to the Trustee of
     the proposed
<PAGE>

                                                                           58

     payment pursuant to this clause, such manner of payment shall
     be deemed practicable by the Trustee in its sole discretion.

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

     SECTION 308.  Persons Deemed Owners.
                   ----------------------

     Prior to the due presentment of a Security for registration of
transfer, the Company, the Trustee and any agent of the Company or the Trustee
may treat the Person in whose name such Security is registered as the owner of
such Security for the purpose of receiving payment of Accreted Value of (and
premium, if any) and (subject to Sections 305 and 307) interest on such Security
and for all other purposes whatsoever, whether or not such Security is 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.

     SECTION 309.  Cancellation.
                   -------------

     All Securities surrendered for payment, redemption, registration of
transfer or exchange shall, if surrendered to any Person other than the Trustee,
be delivered to the Trustee and shall be promptly cancelled 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
<PAGE>

                                                                           59

cancelled as provided in this Section, except as expressly permitted by this
Indenture. All cancelled Securities held by the Trustee shall be disposed of by
the Trustee in accordance with its customary procedures unless by Company Order
the Company shall direct that cancelled Securities be returned to it.

     SECTION 310.  Computation of Interest.
                   ------------------------

     Interest on the Securities shall be computed on the basis of a 360-day
year comprised of twelve 30-day months.

     SECTION 311.  CUSIP Number.
                   -------------

     The Company in issuing the Securities may use a "CUSIP" number (if then
generally in use), and if so, the Trustee may use the CUSIP numbers in notices
of redemption or exchange as a convenience to Holders; provided, however, 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. The Company shall promptly notify the Trustee in writing of any
change in the CUSIP number of the Securities.

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

          (a)  The Global Securities initially shall (i) be registered in the
name of the Depository or the nominee of such Depository, (ii) be deposited with
the Trustee as custodian for such Depository and (iii) bear legends as set forth
in Exhibit A.

     Members of, or participants in, the Depository ("Agent Members") shall
have no rights under this Indenture with respect to any Global Security held on
their behalf by the Depository, or the Trustee as its custodian, or under the
Global Security, and the Depository 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 (i) prevent the Company, the Trustee or any agent of the Company or
the Trustee from giving effect to
<PAGE>

                                                                           60

any written certification, proxy or other authorization furnished by the
Depository or (ii) impair, as between the Depository and its Agent Members, the
operation of customary practices governing the exercise of the rights of a
Holder of any Security.

     (b)  Transfers of Global Securities shall be limited to transfers in
whole, but not in part, to the Depository, its successors or their respective
nominees. Interests of beneficial owners in a Rule 144A Global Security may be
transferred or exchanged for interests in an Institutional Accredited Investor
Global Security or a Regulation S Global Security, interests of beneficial
owners in an Institutional Accredited Investor Global Security may be
transferred or exchanged for interests in a Rule 144A Global Security or a
Regulation S Global Security and interests of beneficial owners in a Regulation
S Global Security may be transferred or exchanged for interests in a Rule 144A
Global Security or an Institutional Accredited Investor Global Security, in each
case in accordance with the rules and procedures of the Depository and the
provisions of Section 313. Interests of beneficial owners in the Global
Securities may be transferred or exchanged for Physical Securities in accordance
with the rules and procedures of the Depository and the provisions of Section
313. In addition, Physical Securities shall be transferred to all beneficial
owners in exchange for their beneficial interests in a Global Security if (i)
the Depository notifies the Company that it is unwilling or unable to continue
as a depository for such Global Security or if at any time the Depository ceases
to be a clearing agency registered under the Exchange Act, and a successor
depository is not appointed by the Company within 90 days, (ii) the Company
executes and delivers to the Trustee a notice that such Global Security shall be
so transferable, registrable and exchangeable, and such transfer shall be
registrable, or (iii) there shall have occurred and be continuing a Default or
Event of Default with respect to the Securities represented by such Global
Security.

     (c)  In connection with any transfer or exchange of a portion of the
beneficial interest in any Global Security to beneficial owners pursuant to
paragraph (b), the Security Registrar shall (if one or more Physical Securities
are to be issued) reflect on its books and records the date and a
<PAGE>

                                                                           61

decrease in the principal amount at maturity of the Global Security in an amount
equal to the principal amount at maturity of the beneficial interest in the
Global Security to be transferred, and the Company shall execute, and the
Trustee shall authenticate and deliver, one or more Physical Securities of like
tenor and principal amount at maturity of authorized denominations.

     (d)  In connection with the transfer of Global Securities as an entirety
to beneficial owners pursuant to paragraph (b), the Global Securities shall be
deemed to be surrendered to the Trustee for cancellation, and the Company shall
execute, and the Trustee shall authenticate and deliver, to each beneficial
owner identified by the Depository in exchange for its beneficial interest in
the Global Securities, an equal aggregate principal amount at maturity of
Physical Securities of like tenor of authorized denominations.

     (e)  Any Physical Security delivered in exchange for an interest in a
Global Security pursuant to paragraph (b) or (c) of this Section 312 shall,
except as otherwise provided by paragraph (d) of Section 313, bear the legend
regarding transfer restrictions applicable to the Physical Securities set forth
in Exhibit A.

     (f)  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.

     (g)  In the event that a Global Security is exchanged for Physical
Securities pursuant to this Section 312 prior to the consummation of a
Registered Exchange Offer or the effectiveness of a Shelf Registration Statement
with respect to such Securities, such Securities may be exchanged only in
accordance with such procedures as are substantially consistent with the
provisions of Sections 312 and 313 (including the certification requirements set
forth on the reverse of the Initial Securities intended to ensure that such
transfers comply with Rule 144A, Regulation S or such other applicable exemption
from registration under the Securities Act, as the case may be) and such other
<PAGE>

                                                                           62

procedures as may from time to time be adopted by the Company.

     SECTION 313.  Special Transfer Provisions.
                   ----------------------------

     (a)  Transfers to Non-QIB Institutional Accredited Investors. The following
          --------------------------------------------------------
provisions shall apply with respect to the registration of any proposed transfer
of a Security to any Institutional Accredited Investor which is not a QIB
(excluding transfers to non-U.S. persons):

          (1)  The Security Registrar shall register the transfer of any
     Security if (x) the requested transfer is not prior to that date which is
     two years (or such shorter period as may be prescribed by Rule 144(k) under
     the Securities Act or any successor provision thereunder) after the later
     of the original issue date of such Security (or of any Predecessor
     Security) or three months after the last day on which the Company or any
     Affiliate of the Company was the owner of such Security or any Predecessor
     Security or (y) such transfer is being made by a proposed transferor who
     has checked the box provided for on the form of Security stating, or who
     has otherwise advised the Company and the Security Registrar in writing,
     that the transfer has been made to an institutional "accredited investor"
     (as defined in Rule 501(a)(1), (2), (3) or (7) under the Securities Act)
     and the proposed transferee has delivered to the Security Registrar a
     certificate containing certain representations and agreements (the form of
     which certificate can be obtained from the Trustee or the Company).

          (2)  Subject to paragraph (1) above, if (i) the proposed
     transferee is an Agent Member, and the Securities to be transferred consist
     of Physical Securities which after transfer are to be evidenced by an
     interest in the Institutional Accredited Investor Global Security, upon
     receipt by the Security Registrar of instructions given in accordance with
     the Depository's and the Security Registrar's procedures, the Security
     Registrar shall reflect on the Security Register the date and an increase
     in the principal amount at maturity of the Institutional Accredited
     Investor Global Security in an amount equal to the principal amount at
     maturity of the Physical Securities
<PAGE>

                                                                           63

     to be transferred, and the Trustee shall cancel the Physical Securities so
     transferred, and (ii) the proposed transferor is an Agent Member holding a
     beneficial interest in a Rule 144A Global Security or a Regulation S Global
     Security, upon receipt by the Security Registrar of instructions given in
     accordance with the Depository's and the Security Registrar's procedures,
     the Security Registrar shall reflect on its books and records the date of
     such transfer and (A) a decrease in the principal amount at maturity of
     such Rule 144A Global Security or Regulation S Global Security, as the case
     may be, in an amount equal to the principal amount at maturity of the
     beneficial interest in a Global Security to be transferred, and (B) an
     increase in the principal amount at maturity of an Institutional Accredited
     Investor Global Security in an amount equal to the principal amount at
     maturity to be transferred.

     (b)  Transfers to Non-U.S. Persons. The following provisions shall apply
          ------------------------------
with respect to the registration of any proposed transfer of a Security to any
non-U.S. person:

          (1)  The Security Registrar shall register the transfer of any
     Security if (x) the requested transfer is not prior to that date which is
     two years (or such shorter period as may be prescribed by Rule 144(k) under
     the Securities Act or any successor provision thereunder) after the later
     of the original issue date of such Security (or of any Predecessor
     Security) or three months after the last day on which the Company or any
     Affiliate of the Company was the owner of such Security or any Predecessor
     Security or (y) such transfer is being made by a proposed transferor who
     has checked the box provided for on the form of Security stating, or who
     has otherwise advised the Company and the Security Registrar in writing,
     that the transfer has been made outside the U.S. in an offshore transaction
     within the meaning of Regulation S in compliance with the exemption from
     registration under the Securities Act provided by Rule 904 under the
     Securities Act.

          (2)  Subject to paragraph (1) above, if (i) the proposed
     transferee is an Agent Member, and the
<PAGE>

                                                                           64

     Securities to be transferred consist of Physical Securities which after
     transfer are to be evidenced by an interest in the Regulation S Global
     Security, upon receipt by the Security Registrar of instructions given in
     accordance with the Depository's and the Security Registrar's procedures,
     the Security Registrar shall reflect on the Security Register the date and
     an increase in the principal amount at maturity of the Regulation S Global
     Security in an amount equal to the principal amount of at maturity the
     Physical Securities to be transferred, and the Trustee shall cancel the
     Physical Securities so transferred, and (ii) the proposed transferor is an
     Agent Member holding a beneficial interest in a Rule 144A Global Security
     or an Institutional Accredited Investor Global Security, upon receipt by
     the Security Registrar of instructions given in accordance with the
     Depository's and the Security Registrar's procedures, the Security
     Registrar shall reflect on its books and records the date of such transfer
     and (A) a decrease in the principal amount at maturity of such Rule 144A
     Global Security or Institutional Accredited Investor Global Security, as
     the case may be, in an amount equal to the principal amount at maturity to
     be transferred and (B) an increase in the principal amount at maturity of a
     Regulation S Global Security in an amount equal to the principal amount at
     maturity to be transferred.

     (c)  Transfers to QIBs. The following provisions shall apply with respect
          ------------------
to the registration of any proposed transfer of a Security to any QIB
(excluding transfers to non-U.S. persons):

          (1)  The Security Registrar shall register the transfer of any
     Security if (x) the requested transfer is not prior to that date which is
     two years (or such shorter period as may be prescribed by Rule 144(k) under
     the Securities Act or any successor provision thereunder) after the later
     of the original issue date of such Security (or of any Predecessor
     Security) or three months after the last day on which the Company or any
     Affiliate of the Company was the owner of such Security or any Predecessor
     Security or (y) such transfer is being made by a proposed transferor who
     has checked the box provided for on the form of Security
<PAGE>

                                                                           65

     stating, or who has otherwise advised the Company and the Security
     Registrar in writing, that the transfer has been made in compliance with
     the exemption from registration under the Securities Act provided under
     Rule 144A to a transferee who has signed the certification provided for on
     the form of Security stating, or has otherwise advised the Company and the
     Security Registrar in writing, that such transferee represents and warrants
     that it is purchasing the Security for its own account or an account with
     respect to which it exercises sole investment discretion and that each of
     it and any such account is a QIB within the meaning of Rule 144A and is
     aware that the sale to it is being made in reliance on Rule 144A and
     acknowledges that it has received such information regarding the Company as
     it has requested pursuant to Rule 144A or has determined not to request
     such information and that it is aware that the transferor is relying upon
     the foregoing representations in order to claim the exemption from
     registration provided by Rule 144A.

          (2)  Subject to paragraph (1) above, if (i) the proposed
     transferee is an Agent Member, and the Securities to be transferred consist
     of Physical Securities which after transfer are to be evidenced by an
     interest in the Rule 144A Global Security, upon receipt by the Security
     Registrar of instructions given in accordance with the Depository's and the
     Security Registrar's procedures, the Security Registrar shall reflect on
     the Security Register the date and an increase in the principal amount at
     maturity of the Rule 144A Global Security in an amount equal to the
     principal amount at maturity of the Physical Securities to be transferred,
     and the Trustee shall cancel the Physical Securities so transferred, and
     (ii) the proposed transferor is an Agent Member holding a beneficial
     interest in an Institutional Accredited Investor Global Security or a
     Regulation S Global Security, upon receipt by the Security Registrar of
     instructions given in accordance with the Depository's and the Security
     Registrar's procedures, the Security Registrar shall reflect on its books
     and records the date of such transfer and (A) a decrease in the principal
     amount at maturity of such Institutional
<PAGE>

                                                                              66

     Accredited Investor Global Security or Regulation S Global Security, as the
     case may be, in an amount equal to the principal amount at maturity to be
     transferred and (B) an increase in the principal amount at maturity of a
     Rule 144A Global Security in an amount equal to the principal amount at
     maturity to be transferred.

     (d)  Private Placement Legend. (1) Upon the registration of transfer,
          -------------------------
exchange or replacement of Securities, the Security Registrar shall deliver only
Securities that bear the Private Placement Legend unless (i) the transfer or
exchange of Initial Securities contemplated by paragraph (d)(2) or (d)(3) below
has occurred or (ii) (x) the circumstances contemplated by clause (a)(1)(x),
(b)(1)(x) or (c)(1)(x) of this Section 313 exist and (y) there is delivered to
the Security Registrar and the Trustee an Opinion of Counsel reasonably
satisfactory to the Company and the Trustee to the effect that neither such
legend nor the related restrictions on transfer are required in order to
maintain compliance with the provisions of the Securities Act.

          (2)  After a transfer of any Initial Securities during the period of
     the effectiveness of a Shelf Registration Statement with respect to such
     Initial Securities, all requirements pertaining to legends on such Initial
     Security will cease to apply, the requirements requiring that any such
     Initial Security be issued in global form will cease to apply, and an
     Initial Security in certificated or global form without legends will be
     available to the transferee of the Holder of such Initial Securities upon
     exchange of such transferring Holder's certificated Initial Security. Upon
     the occurrence of any of the circumstances described in this paragraph, the
     Company will deliver an Officers' Certificate to the Trustee instructing
     the Trustee to issue Securities without legends.

          (3)  Upon the consummation of a Registered Exchange Offer with respect
     to the Initial Securities pursuant to which certain Holders of such Initial
     Securities are offered Exchange Securities (other than Private Exchange
     Securities) in exchange for their Initial Securities, all requirements
     pertaining to such Initial Securities that Initial Securities be issued in

<PAGE>

                                                                              67

     global form will cease to apply, and certificated Initial Securities with
     the Private Placement Legend will be available to Holders of such Initial
     Securities that do not exchange their Initial Securities, and Exchange
     Securities in certificated or global form will be available to Holders that
     exchange such Initial Securities in such Registered Exchange Offer. Upon
     the occurrence of any of the circumstances described in this paragraph, the
     Company will deliver an Officers' Certificate to the Trustee instructing
     the Trustee to issue Securities without legends.

          (4)  Upon the consummation of a Private Exchange Offer with respect to
     the Initial Securities pursuant to which Holders of such Initial Securities
     are offered Private Exchange Securities in exchange for their Initial
     Securities, all requirements pertaining to such Initial Securities that
     Initial Securities issued to certain Holders be issued in global form will
     continue to apply, and Private Exchange Securities in global form will be
     available to Holders that exchange such Initial Securities in such Private
     Exchange Offer.

     (e)  Other Transfers. If a Holder proposes to transfer a Security
          ----------------
pursuant to any exemption from the registration requirements of the Securities
Act other than as provided for by Sections 313(a), 313(b) and 313(c) and other
than pursuant to Section 313(d)(4), the Security Registrar shall only register
such transfer or exchange if such transferor delivers to the Security Registrar
and the Trustee an Opinion of Counsel satisfactory to the Company and the
Security Registrar that such transfer is in compliance with the Securities Act
and the terms of this Indenture.

     (f)  General. By its acceptance of any Security bearing the Private
          --------
Placement Legend, each Holder of such a Security acknowledges the restrictions
on transfer of such Security set forth in this Indenture and in the Private
Placement Legend and agrees that it will transfer such Security only as provided
in this Indenture.

     The Security Registrar shall retain copies of all letters, notices and
other written communications received pursuant to Section 312 or this Section
313 for a period of two years, during which time such letters, notices and other
written communications shall at the written request of the
<PAGE>

                                                                              68

Company be delivered to the Company. After retaining any such copies of letters,
notices and other written communications for a period of at least two years, all
such copies may be destroyed by the Trustee. The Company shall have the right to
inspect and make copies of all such letters, notices or other written
communications at any reasonable time upon the giving of reasonable prior
written notice to the Security Registrar.

                                 ARTICLE FOUR

                          SATISFACTION AND DISCHARGE

     SECTION 401.  Satisfaction and Discharge of Indenture.
                   ----------------------------------------

     This Indenture shall cease to be of further effect (subject to Section
1206 and except as to surviving rights of registration of transfer, transfer,
exchange and replacement of Securities expressly provided for herein or pursuant
hereto) and the Trustee, at the expense of the Company, shall execute proper
instruments acknowledging satisfaction and discharge of this Indenture when

          (1)  either

               (a)  all Outstanding Securities have been delivered to the
          Trustee for cancellation; or

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

                    (i)  have become due and payable, or

                   (ii)  will become due and payable within one year, or

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

                                                                              69

               and the Company, in the case of (i), (ii) or (iii) above, has
               irrevocably deposited or caused to be deposited with the Trustee
               funds in an amount sufficient to pay and discharge the entire
               indebtedness on the Securities not theretofore delivered to the
               Trustee for cancellation, for Accreted Value of (and premium, if
               any, on), and interest on, the Securities to Maturity or the
               Redemption Date, as the case may be;

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

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

     Notwithstanding the satisfaction and discharge of this Indenture, the
obligations under Sections 607 and 609 and, if money shall have been deposited
with the Trustee pursuant to clause (1)(b) of this Section 401, the obligations
of the Trustee under Section 402 and the last paragraph of Section 1003 shall
survive.

     SECTION 402.  Application of Trust Money.
                   --------------------------

     Subject to the provisions of the last paragraph of Section 1003, all money
deposited with the Trustee pursuant to Section 401 shall be held in trust and
applied by it, in accordance with the provisions of the Securities and this
Indenture, to the payment, either directly or through any Paying Agent
(including the Company acting as its own Paying Agent) as the Trustee may
determine, to the Persons entitled thereto, of the Accreted Value (and premium,
if any) and interest for whose payment such money has been deposited with the
Trustee; but such money need not be segregated from other funds except to the
extent required by law.
<PAGE>

                                                                              70

                                 ARTICLE FIVE

                                   REMEDIES

     SECTION 501.  Events of Default.
                   ------------------

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

          (1)  failure to pay Accreted Value of (or premium, if any, on) any
     Security when due; or

          (2)  failure to pay any interest on any Security when due, continued
     for 30 days; or

          (3)  default in the payment of Accreted Value of (and premium, if any)
     and interest on Securities required to be purchased pursuant to an Offer to
     Purchase pursuant to Section 1009 when due and payable; or

          (4)  failure to perform or comply with the provisions of Section 801,
     803 or 1016; or

          (5)  failure to perform any covenant or agreement of the Company or
     any Guarantor in this Indenture or in any Security (other than a covenant a
     default in whose performance is elsewhere in this Section specifically
     dealt with) continued for 60 days after written notice to the Company by
     the Trustee or Holders of at least 25% in aggregate principal amount at
     maturity of the Outstanding Securities, which notice shall specify the
     default and state that such notice is a "Notice of Default" hereunder; or

          (6)  default under the terms of any instrument evidencing or securing
     Debt of the Company or any Restricted Subsidiary having an outstanding
     principal amount of not less than $25,000,000 or its foreign currency
     equivalent at the time which default results
<PAGE>

                                                                              71

     in the acceleration of the payment of such indebtedness or constitutes the
     failure to pay such indebtedness when due (after expiration of any
     applicable grace period); or

          (7)  the rendering of a judgment or judgments against the Company or
     any Restricted Subsidiary in an aggregate amount in excess of $25,000,000
     or its foreign currency equivalent at the time and shall not be waived,
     satisfied or discharged for any period of 45 consecutive days during which
     a stay of enforcement shall not be in effect; or

          (8)  any Restricted Subsidiary Guarantee ceases to be in full force
     and effect (other than in accordance with the terms of such Restricted
     Subsidiary Guarantee) or any Guarantor denies or disaffirms its obligations
     under its Restricted Subsidiary Guarantee; or

          (9)  the entry of a decree or order by a court having jurisdiction in
     the premises adjudging the Company or any Significant Subsidiary a bankrupt
     or insolvent, or approving as properly filed a petition seeking
     reorganization, arrangement, adjustment or composition of or in respect of
     the Company or any Significant Subsidiary under the Federal Bankruptcy Code
     or any other applicable federal, state or foreign law, or appointing a
     receiver, liquidator, assignee, trustee, custodian or sequestrator (or
     other similar official) of the Company or any Significant Subsidiary or of
     any substantial part of its Property, or ordering the winding up or
     liquidation of its affairs, and the continuance of any such decree or order
     unstayed and in effect for a period of 60 consecutive days; or

          (10) the institution by the Company or any Significant Subsidiary of
     proceedings to be adjudicated a bankrupt or insolvent, or the consent by it
     to the institution of bankruptcy or insolvency proceedings against it, or
     the filing by it of a petition or answer or consent seeking reorganization
     or relief under the Federal Bankruptcy Code or any other applicable
     federal, state or foreign law, or the consent by it to the filing of any
     such petition or to the appointment of a receiver, liquidator, assignee,
     trustee, custodian
<PAGE>

                                                                              72

     or sequestrator (or other similar official) of the Company or any
     Significant Subsidiary or of any substantial part of its Property, or the
     making by it of an assignment for the benefit of creditors, or the
     admission by it in writing of its inability to pay its debts generally as
     they become due.

     SECTION 502.  Acceleration of Maturity; Rescission and Annulment.
                   ---------------------------------------------------

     If an Event of Default (other than an Event of Default specified in Section
501(9) or 501(10) with respect to the Company) shall occur and be continuing,
the Trustee or the Holders of not less than 25% in aggregate principal amount at
maturity of the Outstanding Securities may declare the Accreted Value, premium,
if any, and accrued and unpaid interest in respect of all the Securities to be
due and payable immediately, by a notice in writing to the Company (and to the
Trustee if given by Holders), and upon any such declaration such Accreted Value,
premium, if any, and accrued and unpaid interest shall become immediately due
and payable. If an Event of Default specified in Section 501(9) or 501(10)
occurs with respect to the Company, the Accreted Value, premium, if any, and
accrued and unpaid interest in respect of all the Securities shall ipso facto
                                                                   ---- -----
become immediately due and payable without any declaration or other act on the
part of the Trustee or any Holder.

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

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

               (A)  all overdue interest on all Outstanding Securities,

               (B)  all unpaid Accreted Value of (and premium, if any, on) any
          Outstanding Securities
<PAGE>

                                                                              73

          which has become due otherwise than by such declaration of
          acceleration, and interest on such unpaid Accreted Value at the rate
          borne by the Securities,

               (C)  to the extent that payment of such interest is lawful,
          interest on overdue interest at the rate borne by the 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, other than the nonpayment of amounts of
     Accreted Value of (or premium, if any, on) Securities 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

          (a)  default is made in the payment of any interest on any Security
     when due, continued for 30 days, or

          (b)  default is made in the payment of the Accreted Value of (or
     premium, if any, on) any Security when due,

the Company will, upon demand of the Trustee, pay to the Trustee for the benefit
of the Holders of such Securities the whole amount then due and payable on such
Securities for Accreted Value (and premium, if any) and interest, and interest
on any overdue Accreted Value (and premium, if any) and, to the extent that
payment of such interest shall be legally enforceable, upon any overdue
installment of interest, at the rate borne by the Securities, and, in addition
thereto, such further amount as shall be sufficient to cover the costs and
expenses of collection, including the
<PAGE>

                                                                              74

reasonable compensation, expenses, disbursements and advances of the Trustee,
its agents and counsel.

     If the Company fails to pay such amounts forthwith upon such demand, the
Trustee, in its own name as trustee of an express trust, may institute a
judicial proceeding for the collection of the sums so due and unpaid, may
prosecute such proceeding to judgment or final decree and may enforce the same
against the Company or any other obligor upon the Securities 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 the Securities, wherever
situated.

     If an Event of Default occurs and is continuing, the Trustee may in its
discretion proceed to protect and enforce its rights and the rights of the
Holders 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 Accreted Value of the
Securities shall then be due and payable as herein 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 Accreted Value, premium, 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 of Accreted Value
     (and premium, if any) and interest 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,
<PAGE>

                                                                              75

     expenses, disbursements and advances of the Trustee and 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 or sequestrator (or
other similar official) in any such judicial proceeding is hereby authorized by
each Holder to make such payments to the Trustee and, in the event that the
Trustee shall consent to the making of such payments directly to the Holders, to
pay the Trustee any amount due it for the reasonable compensation, expenses,
disbursements and advances of the Trustee and its agents and counsel, and any
other amounts due the 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 any plan of
reorganization, arrangement, adjustment or composition affecting the Securities
or the rights of any Holder thereof, or to authorize the Trustee to vote in
respect of the claim of any Holder in any such proceeding.

     SECTION 505.  Trustee May Enforce Claims Without Possession of Securities.
                   ------------------------------------------------------------

     All rights of action and  claims under this Indenture or the Securities
may be prosecuted and enforced by the Trustee without the possession of any of
the Securities or the production thereof in any proceeding relating thereto, and
any such proceeding instituted by the Trustee shall be brought in its own name
and 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 and its agents and counsel, be for the
ratable benefit of the Holders of the Securities in respect of which such
judgment has been recovered.

     SECTION 506.  Application of Money Collected.
                   -------------------------------
<PAGE>

                                                                              76

     Any money collected by the Trustee pursuant to this Article Five 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 Accreted Value (or
premium, if any) or interest, upon presentation of the Securities and the
notation thereon of the payment if only partially paid and upon surrender
thereof if fully paid:

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

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

     THIRD:    The balance, if any, to the Person or Persons entitled thereto.

     SECTION 507.  Limitation on Suits.
                   --------------------

     No Holder of any Securities shall have any right to institute any
proceeding with respect to this Indenture or for any other remedy hereunder,
unless

          (1)  such Holder shall have previously given to the Trustee written
     notice of a continuing Event of Default;

          (2)  the Holders of not less than 25% in aggregate principal amount at
     maturity of the Outstanding Securities shall have made written request and
     offered reasonable indemnity to the Trustee to institute such proceeding as
     trustee; and

          (3)  the Trustee shall not have received from the Holders of a
     majority in aggregate principal amount at maturity of the Outstanding
     Securities a direction inconsistent with such request and shall have failed
     to institute such proceeding within 60 days;
<PAGE>

                                                                              77

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

     SECTION 508.  Unconditional Right of Holders to Receive Accreted Value,
                   ---------------------------------------------------------
Premium and Interest.
---------------------

     Notwithstanding any other provision in this Indenture, including Section
507, the Holder of any Security shall have the right, which is absolute and
unconditional, to receive payment as provided herein (including, if applicable,
Article Twelve) and in such Security of the Accreted Value of (and premium, if
any) and (subject to Section 307) interest on such Security on the respective
Stated Maturities expressed in such Security (or, in the case of redemption, on
the Redemption Date) and to institute suit for the enforcement of any such
payment, and such rights shall not be impaired without the consent of such
Holder.

     SECTION 509.  Restoration of Rights and Remedies.
                   -----------------------------------

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

     SECTION 510.  Rights and Remedies Cumulative.
                   -------------------------------

     Except as otherwise provided with respect to the replacement or payment of
mutilated, destroyed, lost or stolen Securities in the last paragraph of Section
306, no right or remedy herein conferred upon or reserved to the Trustee or to
the Holders is intended to be exclusive of any
<PAGE>

                                                                              78

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 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 Five or by
law to the Trustee or to the Holders may be exercised from time to time, and as
often as may be deemed expedient, by the Trustee or by the Holders, as the case
may be.

     SECTION 512.  Control by Holders.
                   -------------------

     The Holders of a majority in aggregate principal amount at maturity of the
Outstanding Securities shall have the right to direct the time, method and place
of conducting any proceeding for any remedy available to the Trustee or
exercising any trust or power conferred on the Trustee; 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 that is not inconsistent with such direction, and

          (3)  the Trustee need not take any action which might involve it in
     personal liability or be unjustly prejudicial to the Holders not
     consenting.

     SECTION 513.  Waiver of Past Defaults.
                   ------------------------

     The Holders of not less than a majority in principal amount at maturity of
the Outstanding Securities may, on
<PAGE>

                                                                              79

behalf of the Holders of all the Securities, waive any past Default hereunder
and its consequences, except a Default

          (1)  in the payment of the Accreted Value of (or premium, if any) or
     interest on any Security, or

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

     The Company shall deliver to the Trustee an Officers' Certificate stating
that the requisite majority have consented to such waiver and attaching such
consents upon which, subject to Section 104, the Trustee may conclusively rely.
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 Stay or Extension Laws.
                    ---------------------------------

     The Company covenants (to the extent that it may lawfully do so) that it
shall not at any time insist upon, or plead, or in any manner whatsoever claim
or take the benefit or advantage of, any 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 shall not hinder, delay or impede the execution of any
power herein granted to the Trustee, but shall suffer and permit the execution
of every such power as though no such law had been enacted.
<PAGE>

                                                                              80

                                  ARTICLE SIX

                                  THE TRUSTEE

         SECTION 601.  Certain Duties and Responsibilities.
                       ------------------------------------

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

                  (1) 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

                  (2) 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
         which by any provision 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.

         (b) 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 person would exercise or use under the circumstances in the
     conduct of such person's own affairs.

         (c) 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

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

                  (2) the Trustee shall not be liable for any error of judgment
          made in good faith by a Responsible
<PAGE>

                                                                              81

          Officer, unless it shall be proved that the Trustee was negligent in
          ascertaining the pertinent facts;

                  (3) 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 at
          maturity of the Outstanding Securities 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; and

                  (4) 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 indemnity
          reasonably satisfactory to it against such risk or liability is not
          reasonably assured to it.

         (d) 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 Default.
                       ------------------

         If a Default occurs and is continuing, the Trustee shall transmit, in
     the manner and to the extent provided in TIA Section 313(c), notice of such
     Default within 60 days after it is known to any Responsible Officer of the
     Trustee or written notice of it is received by the Trustee; provided,
                                                                 --------
     however, that, except in the case of a Default in the payment of the
     -------
     Accreted Value of (or premium, if any) or interest on any Security, the
     Trustee shall be protected in withholding such notice if and so long as the
     board of directors, the executive committee, a trust committee of directors
     or Responsible Officers of the Trustee in good faith determines that the
     withholding of such notice is in the interest of the Holders.
<PAGE>

                                                                              82

                  The Trustee is not required to take notice or deemed to have
     notice of any Event of Default with respect to the Securities, except an
     Event of Default under Section 501(1), (2), (3) or (4) hereof (provided
                                                                    --------
     that in the case of Section 501(4), such Event of Default constitutes a
     failure to purchase Securities pursuant to an Offer to Purchase pursuant to
     Section 1016), unless the Trustee shall have received written notice at its
     Corporate Trust Office (which notice shall reference the Securities, the
     Company and the Indenture) of such Event of Default from the Company or any
     Holder or unless a Responsible Officer of the Trustee shall otherwise have
     knowledge thereof.

         SECTION 603.  Certain Rights of Trustee.
                       --------------------------

         Subject to Section 601 and to the provisions of TIA Sections 315(a)
     through 315(d):

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

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

                                                                              83

         omitted by it hereunder in good faith and in reliance thereon;

                  (5) the Trustee may act through counsel, agents, custodians
         and nominees and shall not be responsible for the misconduct or
         negligence of any such person appointed and supervised with due care
         and in good faith;

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

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

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

         SECTION 604.  Trustee Not Responsible for Recitals or Issuance of
                       ---------------------------------------------------
     Securities.
     -----------

         The recitals contained herein and in the Securities, except for the
     Trustee's certificates of authentication, shall be taken as the statements
     of the Company, and the Trustee assumes no responsibility for their
     correctness. The Trustee makes no representations as to the validity or

<PAGE>

                                                                              84

     sufficiency of this Indenture or of the Securities, except that the Trustee
     represents that it is duly authorized to execute and deliver this
     Indenture, authenticate the Securities and perform its obligations
     hereunder. The Trustee shall not be accountable for the use or application
     by the Company of Securities or the proceeds thereof.

         SECTION 605.  May Hold Securities.
                       --------------------

         The Trustee, any Paying Agent, any Security Registrar or any other
     agent of the Company or of the Trustee, in its individual or any other
     capacity, may become the owner or pledgee of Securities 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 Trustee, Paying Agent, Security
     Registrar 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.

         SECTION 607.  Compensation and Reimbursement.
                       -------------------------------

         The Company agrees:

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

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

                                                                              85

         Trustee's negligence, willful misconduct or bad faith; and

                  (3) to indemnify the Trustee and its directors, officers,
         employees and agents for, and to hold them harmless against, any loss,
         liability or expense incurred without negligence, willful misconduct or
         bad faith on the part of any of them, arising out of or in connection
         with the acceptance or administration of this trust, including the
         costs and expenses of defending itself or themselves against any claim
         or liability in connection with the exercise or performance of any of
         its or their powers or duties hereunder.

         The obligations of the Company under this Section 607 to compensate the
     Trustee, to pay or reimburse the Trustee for expenses, disbursements and
     advances and to indemnify and hold harmless the Trustee shall constitute
     additional indebtedness hereunder. As security for the performance of such
     obligations of the Company, the Trustee shall have a claim 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 Accreted Value of (and
     premium, if any, on) or interest on particular Securities.

         When the Trustee incurs expenses or renders services in connection with
     an Event of Default specified in Section 501(9) or (10), the expenses
     (including the reasonable charges and expenses of its counsel) of and the
     compensation for such services are intended to constitute expenses of
     administration under any applicable federal, state or foreign bankruptcy,
     insolvency or other similar law.

         The provisions of this Section 607 shall survive the termination of
     this Indenture or the earlier resignation or removal of the Trustee.

         SECTION 608.  Corporate Trustee Required; Eligibility; Conflicting
                       ----------------------------------------------------
     Interests.
     ----------

         (a) There shall be at all times a Trustee hereunder which shall be
     subject to and comply with the provisions of Section 310(a)(1) of the Trust
     Indenture Act and shall have
<PAGE>

                                                                              86

     a combined capital and surplus of at least $50,000,000. If such Person
     publishes reports of condition at least annually, pursuant to law or to the
     requirements of federal, state, territorial or District of Columbia
     supervising or examining authority, then, for the purposes of this Section
     608, the combined capital and surplus of such Person shall be deemed to be
     its combined capital and surplus as set forth in its most recent report of
     condition so published. If at any time a Responsible Officer of the Trustee
     shall have actual knowledge that the Trustee ceases to be eligible in
     accordance with the provisions of this Section 608, it shall resign
     immediately in the manner and with the effect hereinafter specified in this
     Article Six.

         (b) The Trustee shall be subject to and comply with Section 310(b) of
     the Trust Indenture Act.

         SECTION 609.  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 Six shall become effective until
     the acceptance of appointment by the successor Trustee in accordance with
     the applicable requirements of Section 610.

         (b) The Trustee may resign at any time by giving written notice thereof
     to the Company. If the instrument of acceptance by a successor Trustee
     required by Section 610 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 by Act of the Holders of not
     less than a majority in aggregate principal amount at maturity of the
     Outstanding Securities, delivered to the Trustee and to the Company.

         (d)  If at any time:

                  (1) 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 who has been
<PAGE>

                                                                              87

         a bona fide Holder of a Security for at least six months, or

                  (2) the Trustee shall cease to be eligible under Section
         608(a) and shall fail to resign after written request therefor by the
         Company or by any Holder who has been a bona fide Holder of a Security
         for at least six months, or

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

     then, in any such case, (i) the Company, by a Board Resolution, may remove
     the Trustee or (ii) subject to TIA Section 315(e), any Holder who has been
     a bona fide Holder of a Security for at least six months may, on behalf of
     himself and all others similarly situated, petition any court of competent
     jurisdiction for the removal of the Trustee and the appointment of a
     successor Trustee.

         (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,
     the Company, by a Board Resolution, shall promptly appoint a successor
     Trustee. If the Company does not promptly appoint a successor Trustee after
     such resignation, removal or incapability, or the occurrence of such
     vacancy, a successor Trustee shall be appointed by Act of the Holders of a
     majority in aggregate principal amount at maturity of the Outstanding
     Securities delivered to the Company and the retiring Trustee. In either
     case, the successor Trustee so appointed shall, forthwith upon its
     acceptance of such appointment, become the successor Trustee and supersede
     the successor Trustee appointed by the Company. If no successor Trustee
     shall have been so appointed by the Company or the Holders and accepted
     appointment in the manner hereinafter provided, any Holder who has been a
     bona fide Holder of a Security for at least six months may, on behalf of
     himself and all others similarly situated, petition any court of competent
     jurisdiction for the appointment of a successor Trustee.
<PAGE>

                                                                              88

         (f) The Company shall give notice of each resignation and each removal
     of the Trustee and each appointment of a successor Trustee to the Holders
     of Securities in the manner provided for in Section 106. Each notice shall
     include the name of the successor Trustee and the address of its Corporate
     Trust Office.

         (g) The retiring Trustee shall not be liable for any of the acts or
     omissions of any successor Trustee appointed hereunder.

         SECTION 610.  Acceptance of Appointment by Successor.
                       ---------------------------------------

         Every successor Trustee appointed hereunder shall execute, acknowledge
     and deliver to the Company and to the retiring Trustee an instrument
     accepting such appointment, and thereupon the resignation or removal of the
     retiring Trustee shall become effective and such successor Trustee, without
     any further act, deed or conveyance, shall become vested with all the
     rights, powers, trusts and duties of the retiring Trustee; but, on 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.
     Upon request of any such successor Trustee, the Company shall execute any
     and all instruments for more fully and certainly vesting in and confirming
     to such successor Trustee all such rights, powers and trusts.

         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 Six.

         SECTION 611.  Merger, Conversion, Consolidation or Succession to
                       --------------------------------------------------
     Business.
     ---------

         Any Person into which the Trustee may be merged or converted or with
     which it may be consolidated, or any Person resulting from any merger,
     conversion or consolidation to which the Trustee shall be a party, or any
     Person succeeding to all or substantially all of the
<PAGE>

                                                                              89

     corporate trust business of the Trustee, shall be the successor of the
     Trustee hereunder; provided that such Person shall be otherwise qualified
                        --------
     and eligible under this Article Six, without the execution or filing of any
     paper or any further act on the part of any of the parties hereto. In case
     any Securities shall have been authenticated, but not delivered, by the
     Trustee then in office, any successor by merger, conversion, consolidation
     or transfer of assets to such authenticating Trustee may adopt such
     authentication and deliver the Securities so authenticated with the same
     effect as if such successor Trustee had itself authenticated such
     Securities. In case at that time any of the Securities shall not have been
     authenticated, any successor Trustee may authenticate such Securities
     either in the name of any predecessor hereunder or in the name of the
     successor Trustee. In all such cases such certificates shall have the full
     force and effect which this Indenture provides that the certificate of
     authentication of the Trustee shall have; provided, however, that the right
                                               --------  -------
     to adopt the certificate of authentication of any predecessor Trustee or to
     authenticate Securities in the name of any predecessor Trustee shall apply
     only to its successor or successors by merger, conversion, consolidation or
     transfer of assets.

                                 ARTICLE SEVEN

               HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY

         SECTION 701.  Disclosure of Names and Addresses of Holders.
                       ---------------------------------------------

         Every Holder of Securities, by receiving and holding the same, agrees
     with the Company and the Trustee that none of the Company or the Trustee or
     any agent of either of them shall be held accountable by reason of the
     disclosure of any such information as to the names and addresses of the
     Holders 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.
                       -------------------
<PAGE>

                                                                              90

         Within 60 days after May 15 of each year commencing with the first May
     15 after the first issuance of Securities, the Trustee shall transmit to
     the Holders, in the manner and to the extent provided in TIA Section
     313(c), a brief report dated as of such May 15 if required by TIA Section
     313(a).

         A copy of each such report at the time of its mailing to Holders shall
     be filed with the Commission and the principal national securities exchange
     (if any) on which the Securities are listed.

         The Company shall notify a Responsible Officer of the Trustee if the
     Securities become listed on any national securities exchange or of any
     delisting thereof.

         SECTION 703.  Reports by Company.
                       -------------------

         The Company shall file with the Trustee and deliver to the Holders of
     Securities the reports and other information required to be provided by it
     pursuant to Section 1007.

                                 ARTICLE EIGHT

             CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

         SECTION 801.  Company May Consolidate, etc., Only on Certain Terms.
                       -----------------------------------------------------

         The Company shall not, in a single transaction or a series of related
     transactions, (i) consolidate with or merge into any other Person or
     Persons or permit any other Person to consolidate with or merge into the
     Company or (ii) directly or indirectly, transfer, sell, lease, convey or
     otherwise dispose of all or substantially all its assets to any other
     Person or Persons, unless:

                  (1) in a transaction in which the Company is not the surviving
         Person or in which the Company transfers, sells, leases, conveys or
         otherwise disposes of all or substantially all of its assets to any
         other Person, the resulting, surviving or transferee Person (the
         "successor entity") is organized under the laws of the United States of
         America or any State thereof or the
<PAGE>

                                                                              91

         District of Columbia and shall expressly assume, by a supplemental
         indenture executed and delivered to the Trustee in form satisfactory to
         the Trustee, all of the Company's obligations under this Indenture;

                  (2) immediately before and after giving effect to such
         transaction and treating any Debt which becomes an obligation of the
         Company (or the successor entity) or a Restricted Subsidiary as a
         result of such transaction as having been Incurred by the Company or
         such Restricted Subsidiary at the time of the transaction, no Default
         or Event of Default shall have occurred and be continuing;

                  (3) immediately after giving effect to such transaction, the
         Consolidated Net Worth of the Company (or the successor entity) is
         equal to or greater than that of the Company immediately prior to the
         transaction;

                  (4) immediately after giving effect to such transaction and
         treating any Debt which becomes an obligation of the Company (or the
         successor entity) or a Restricted Subsidiary as a result of such
         transaction as having been Incurred by the Company or such Restricted
         Subsidiary at the time of the transaction, the Company (or the
         successor entity) could Incur at least $1.00 of additional Debt
         pursuant to the provisions of paragraph (a) of Section 1010;

                  (5) if, as a result of any such transaction, Property of the
         Company (or the successor entity) or any Restricted Subsidiary would
         become subject to a Lien prohibited by the provisions of Section 1014,
         the Company (or the successor entity) shall have secured the Securities
         as required by said covenant;

                  (6) in the case of a transfer, sale, lease, conveyance or
         other disposition of all or substantially all of the assets of the
         Company, such assets shall have been transferred as an entirety or
         virtually as an entirety to one Person and such Person shall have
         complied with all the provisions of this paragraph; and

                  (7) the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each
<PAGE>

                                                                              92

         in form and substance reasonably satisfactory to the Trustee, stating
         that such consolidation, merger, transfer, sale, lease, conveyance or
         other disposition and, if a supplemental indenture is required in
         connection with such transaction, such supplemental indenture, complies
         with this Article and that all conditions precedent herein provided for
         relating to such transaction have been complied with, and, with respect
         to such Officers' Certificate, setting forth the manner of
         determination of the Consolidated Net Worth, in accordance with clause
         (3) of this Section 801, of the Company or, if applicable, of the
         successor entity as required pursuant to the foregoing.

         SECTION 802.  Successor Company Substituted.
                       ------------------------------

         Upon any consolidation of the Company with or merger of the Company
     with or into any other Person or any transfer, sale, lease, conveyance or
     other disposition of all or substantially all the assets of the Company to
     any Person or Persons in accordance with Section 801, the successor Person
     formed by such consolidation or into which the Company is merged or to
     which such transfer, sale, lease, conveyance or other disposition is made
     shall succeed to, and be substituted for, and may exercise every right and
     power of, the Company under this Indenture with the same effect as if such
     successor Person had been named as the Company herein, and the predecessor
     Company (which term shall for this purpose mean the Person named as the
     "Company" in the first paragraph of this Indenture or any successor Person
     which shall have become such in the manner described in Section 801),
     except in the case of a lease, shall be released from all its obligations
     and covenants under this Indenture and the Securities and may be dissolved
     and liquidated.

         SECTION 803.  Guarantor May Consolidate, etc., Only on Certain Terms.
                       -------------------------------------------------------

         The Company shall not permit any Guarantor to, in a single transaction
     or a series of related transactions, (i) consolidate with or merge into any
     other Person or Persons (other than the Company or another Guarantor) or
     permit any other Person (other than the Company or another Guarantor) to
     consolidate with or merge into such Guarantor or (ii) directly or
     indirectly, transfer, sell, lease, convey or
<PAGE>

                                                                              93

     otherwise dispose of all or substantially all its assets to any other
     Person or Persons (other than the Company or another Guarantor), unless:

                  (1) in a transaction in which such Guarantor is not the
         surviving Person or in which such Guarantor transfers, sells, leases,
         conveys or otherwise disposes of all or substantially all of its assets
         to any other Person, the resulting, surviving or transferee Person (the
         "successor guarantor") is organized under the laws of the United States
         of America or any State thereof or the District of Columbia and shall
         expressly assume, by a supplemental indenture executed and delivered to
         the Trustee in form satisfactory to the Trustee, all of such
         Guarantor's obligations under this Indenture;

                  (2) immediately before and after giving effect to such
         transaction and treating any Debt which becomes an obligation of the
         Company or a Restricted Subsidiary (including the successor guarantor)
         as a result of such transaction as having been Incurred by the Company
         or such Restricted Subsidiary at the time of the transaction, no
         Default or Event of Default shall have occurred and be continuing;

                  (3) immediately after giving effect to such transaction, the
         Consolidated Net Worth of the Company is equal to or greater than that
         of the Company immediately prior to the transaction;

                  (4) immediately after giving effect to such transaction and
         treating any Debt which becomes an obligation of the Company or a
         Restricted Subsidiary (including the successor guarantor) as a result
         of such transaction as having been Incurred by the Company or such
         Restricted Subsidiary at the time of the transaction, the Company could
         Incur at least $1.00 of additional Debt pursuant to the provisions of
         paragraph (a) of Section 1010;

                  (5) if, as a result of any such transaction, Property of the
         Company or any Restricted Subsidiary (including the successor
         guarantor) would become subject to a Lien prohibited by the provisions
         of
<PAGE>

                                                                              94

         Section 1014, the Company shall have secured the Securities as required
         by said covenant;

                  (6) in the case of a transfer, sale, lease, conveyance or
         other disposition of all or substantially all of the assets of such
         Guarantor, such assets shall have been transferred as an entirety or
         virtually as an entirety to one Person and such Person shall have
         complied with all the provisions of this paragraph; and

                  (7) the Company has delivered to the Trustee an Officers'
         Certificate and an Opinion of Counsel, each in form and substance
         reasonably satisfactory to the Trustee, stating that such
         consolidation, merger, transfer, sale, lease, conveyance or other
         disposition and, if a supplemental indenture is required in connection
         with such transaction, such supplemental indenture, complies with this
         Article and that all conditions precedent herein provided for relating
         to such transaction have been complied with, and, with respect to such
         Officers' Certificate, setting forth the manner of determination of the
         Consolidated Net Worth, in accordance with clause (3) of this Section
         803, of such Guarantor or, if applicable, of the successor guarantor as
         required pursuant to the foregoing.

         SECTION 804.  Successor Guarantor Substituted.
                       --------------------------------
<PAGE>

                                                                              95

         Upon any consolidation of a Guarantor with or merger of a Guarantor
with or into any other Person or any transfer, sale, lease, conveyance or other
disposition of all or substantially all the assets of a Guarantor to any Person
or Persons in accordance with Section 803, the successor Person formed by such
consolidation or into which such Guarantor is merged or to which such transfer,
sale, lease, conveyance or other disposition is made shall succeed to, and be
substituted for, and may exercise every right and power of, such Guarantor under
this Indenture with the same effect as if such successor Person had been named
as a Guarantor herein, and the predecessor Guarantor (which term shall for this
purpose mean the Person named as the "New Guarantor" in the first paragraph of
the applicable supplemental indenture or any successor Person which shall have
become such in the manner described in Section 803), except in the case of a
lease, shall be released from all its obligations and covenants under its
Restricted Subsidiary Guarantee and the Securities and may be dissolved and
liquidated.

                                 ARTICLE NINE

                            SUPPLEMENTAL INDENTURES

         SECTION 901.  Supplemental Indentures Without Consent of Holders.
                       ---------------------------------------------------

         The Company and the Trustee may, at any time and from time to time,
without notice to or consent of any Holders of Securities, enter into one or
more indentures supplemental hereto:

               (1) to evidence the succession of another Person to the
         Company or a Guarantor and the assumption by such successor of the
         covenants of the Company or such Guarantor herein and in the
         Securities; or

               (2) to add to the covenants of the Company, for the benefit of
         the Holders, or to surrender any right or power conferred upon the
         Company hereby; or

               (3) to add any additional Events of Default; or
<PAGE>

                                                                              96

               (4) to provide for uncertificated Securities in addition to or in
         place of certificated Securities; or

               (5) to evidence and provide for the acceptance of appointment
         hereunder of a successor Trustee pursuant to the requirements of
         Section 610; or

               (6) to secure the Securities; or

               (7) to comply with the Trust Indenture Act or the Securities Act
         (including Regulation S promulgated thereunder); or

               (8) to add additional Guarantees with respect to the
         Securities or to release Guarantors from Restricted Subsidiary
         Guarantees as provided by the terms of this Indenture; or

               (9) to cure any ambiguity herein, to correct or supplement any
         provision herein which may be inconsistent with any other provision
         herein, or to add any other provision with respect to matters or
         questions arising under this Indenture; provided such actions shall not
                                                 --------
         adversely affect the interests of the Holders 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 at maturity of the Outstanding Securities, by Act of such
Holders delivered to the Company and the Trustee, the Company and the Trustee
may enter into one or more 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 waiving or otherwise modifying in any manner the
rights of the Holders, provided 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 Accreted Value of, or
         any installment of interest on, any Security, or reduce the Accreted
         Value thereof or the interest thereon that would be due and payable
         upon the
<PAGE>

                                                                              97

         Stated Maturity thereof, or change the place of payment where,
         or the coin or currency in which, any Security or any premium or
         interest thereon is payable, or impair the right to institute suit for
         the enforcement of any such payment on or after the Stated Maturity
         thereof; or

               (2) reduce the percentage in principal amount at maturity of
         the Outstanding Securities, the consent of whose Holders is necessary
         for any such supplemental indenture or required for any waiver of
         compliance with certain provisions of this Indenture or certain
         Defaults hereunder; or

               (3) subordinate in right of payment, or otherwise subordinate,
         the Securities to any other Debt; or

               (4) except as otherwise provided herein, release any security
         interest that may have been granted in favor of the Holders of the
         Securities; or

               (5) reduce the premium payable upon the redemption of any
         Security nor change the time at which any Security may be redeemed, as
         described in Exhibit A; or

               (6) reduce the premium payable upon a Change of Control
         Triggering Event or, at any time after a Change of Control Triggering
         Event has occurred, change the time at which the Offer to Purchase
         relating thereto must be made or at which the Securities must be
         repurchased pursuant to such Offer to Purchase; or

               (7) at any time after the Company is obligated to make an
         Offer to Purchase with the Net Available Proceeds from Asset
         Dispositions, change the time at which such Offer to Purchase must be
         made or at which the Securities must be repurchased pursuant thereto;
         or

               (8) make any change in any Restricted Subsidiary Guarantee that
         would adversely affect the Holders of the Securities; or

               (9) modify any provision of the Indenture relating to the
         calculation of Accreted Value with respect to the Securities; or
<PAGE>

                                                                              98

               (10) modify any provision of this Section 902 (except to
         increase any percentage set forth herein).

         It shall not be necessary for any Act of Holders under this Section 902
to approve the particular form of any proposed supplemental indenture, but it
shall be sufficient if such Act shall approve the substance thereof.

         SECTION 903.  Execution of Supplemental Indentures.
                       -------------------------------------

         In executing, or accepting the additional trusts created by, any
supplemental indenture permitted by this Article Nine or the modifications
thereby of the trusts created by this Indenture, the Trustee shall be entitled
to receive, and shall be fully protected in relying upon, an Opinion of Counsel
stating that the execution of such supplemental indenture is authorized or
permitted by this Indenture and an Officers' Certificate stating that all
conditions precedent to the execution of such supplemental indenture have been
fulfilled. The Trustee may, but shall not be obligated to, enter into any such
supplemental indenture which affects the Trustee's own rights, duties or
immunities under this Indenture or otherwise.

         SECTION 904.  Effect of Supplemental Indentures.
                       ----------------------------------

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

         SECTION 905.  Conformity with Trust Indenture Act.
                       ------------------------------------
         Every supplemental indenture executed pursuant to this Article Nine
shall conform as a matter of contract or law to the requirements of the Trust
Indenture Act as then in effect.

         SECTION 906.  Reference in Securities to Supplemental Indentures.
                       ---------------------------------------------------

         Securities authenticated and delivered after the execution of any
supplemental indenture pursuant to this
<PAGE>

                                                                              99

Article Nine may bear a notation in form approved by the Trustee and the Company
as to any matter provided for in such supplemental indenture. If the Company
shall so determine, new Securities 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.

         SECTION 907.  Notice of Supplemental Indentures.
                       ----------------------------------

         Promptly after the execution by the Company and the Trustee of any
supplemental indenture pursuant to this Article Nine, 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 TEN

                                   COVENANTS

         SECTION 1001.  Payment of Accreted Value, Premium, if any, and
                        -----------------------------------------------
Interest.
---------

         The Company covenants and agrees for the benefit of the Holders that it
shall duly and punctually pay the Accreted Value of (and premium, if any) and
interest on the Securities in accordance with the terms of the Securities and
this Indenture.

         SECTION 1002.  Maintenance of Office or Agency.
                        --------------------------------

         The Company shall maintain in The City of New York an office or agency
where Securities may be presented or surrendered for payment, where Securities
may be surrendered for registration of transfer or exchange and where notices
and demands to or upon the Company in respect of the Securities and this
Indenture may be served. The Corporate Trust Office of the Trustee shall be such
office or agency of the Company, unless the Company shall designate and maintain
some other office or agency for one or more of such purposes. The Company shall
give prompt written notice to the Trustee of any change in the location of any
such office
<PAGE>

                                                                             100

or agency. If at any time the Company shall fail to maintain any such required
office or agency or shall fail to furnish the Trustee with the address thereof,
such presentations, surrenders, notices and demands may be made or served at the
Corporate Trust Office of the Trustee, and the Company hereby appoints the
Trustee as its agent to receive all such presentations, surrenders, notices and
demands.

         The Company may also from time to time designate one or more other
offices or agencies (in or outside of The City of New York) where the Securities
may be presented or surrendered for any or all such purposes and may from time
to time rescind any such designation; 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 The City of New York for such
purposes. The Company shall give prompt written notice to the Trustee of any
such designation or rescission and any change in the location of any such other
office or agency.

         SECTION 1003.  Money for Security Payments to Be Held in Trust.
                        ------------------------------------------------

         If the Company shall at any time act as its own Paying Agent, it shall,
on or before each due date of the Accreted Value of (or premium, if any) or
interest on any of the Securities, segregate and hold in trust for the benefit
of the Persons entitled thereto a sum sufficient to pay the Accreted Value of
(or premium, if any) or interest so becoming due until such sums shall be paid
to such Persons or otherwise disposed of as herein provided and shall promptly
notify the Trustee of its action or failure so to act.

         Whenever the Company shall have one or more Paying Agents for the
Securities, it shall, on or before each due date of the Accreted Value of (or
premium, if any) or interest on any Securities, deposit with a Paying Agent a
sum sufficient to pay the Accreted Value (and premium, if any) or interest so
becoming due, such sum to be held in trust for the benefit of the Persons
entitled to such Accreted Value, premium or interest, and (unless such Paying
Agent is the Trustee) the Company will promptly notify the Trustee of such
action or any failure so to act.
<PAGE>

                                                                             101

         The Company shall 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 1003,
that such Paying Agent shall:

               (1) hold all sums held by it for the payment of the Accreted
         Value of, premium, if any, or interest on 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 payment of
         Accreted Value, premium, if any, or interest;

               (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; and

               (4) indemnify the Trustee and its officers, directors,
         employees and agents against any loss, cost or liability caused by, or
         incurred as a result of, such Paying Agent's acts or omissions.

         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.

         Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the Accreted Value of, premium, if
any, or interest on any Security and remaining unclaimed for two years after
such Accreted Value, premium or interest has become due and payable shall be
paid to the Company on Company Request or
<PAGE>

                                                                             102

(if then held by the Company) shall be discharged from such trust; and the
Holder of such Security shall thereafter, as an unsecured general creditor, look
only to the Company for payment thereof, and all liability of the Trustee or
such Paying Agent with respect to such trust money, and all liability of the
Company as trustee thereof, shall thereupon cease; provided, however, that the
                                                   --------  -------
Trustee or such Paying Agent, before being required to make any such repayment,
may at the expense of the Company cause to be published once, in a newspaper
published in the English language, customarily published on each Business Day
and of general circulation in the Borough of Manhattan, The City of New York,
notice that such money remains unclaimed and that, after a date specified
therein, which shall not be less than 30 days from the date of such publication,
any unclaimed balance of such money then remaining will be repaid to the
Company.

         SECTION 1004.  Corporate Existence.
                        --------------------

         Subject to Article Eight, the Company shall do or cause to be done all
things necessary to preserve and keep in full force and effect the corporate
existence, rights (charter and statutory) and franchises of the Company and each
Subsidiary of the Company; provided, however, that the Company shall not be
                           --------  -------
required to preserve, with respect to the Company, any such right or franchise
or, with respect to any such Subsidiary (subject to all the other covenants in
this Indenture), any such corporate existence, right or franchise, if the Board
of Directors shall determine that the preservation thereof is no longer
desirable in the conduct of the business of the Company and its Subsidiaries as
a whole and that the loss thereof is not disadvantageous in any material respect
to the Holders.

         SECTION 1005.  Maintenance of Properties.
                        --------------------------

         The Company shall cause all properties owned by the Company or any
Restricted Subsidiary or used or held for use in the conduct of its business or
the business of any Restricted Subsidiary to be maintained and kept in good
condition, repair and working order and supplied with all necessary equipment
and shall 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
<PAGE>

                                                                             103

connection therewith may be properly and advantageously conducted at all times;
provided, however, that nothing in this Section 1005 shall prevent the Company
--------  -------
from discontinuing the maintenance of any of such properties if such
discontinuance is, in the judgment of the Company, desirable in the conduct of
its business or the business of any Subsidiary and not disadvantageous in any
material respect to the Holders.

         SECTION 1006.  Insurance.
                        ----------

         The Company shall at all times keep all of its and its Restricted
Subsidiaries' properties which are of an insurable nature insured with insurers,
believed by the Company to be responsible, against loss or damage to the extent
that property of similar character is usually so insured by companies similarly
situated and owning like properties.

         SECTION 1007.  Reports.
                        --------

         Whether or not the Company is subject to Section 13(a) or 15(d) of the
Exchange Act, or any successor provision thereto, the Company shall 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(a) or 15(d) or any successor provision thereto if the Company
were subject thereto, 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 to file them. The Company shall also in any event (a) 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, and (ii) file with the Trustee copies of the annual reports, quarterly
reports and other documents (without exhibits) which the Company would have been
required to file with the Commission pursuant to Section 13(a) or 15(d) of the
Exchange Act or any successor provisions thereto if the Company were subject
thereto and (b) if filing such documents by the Company with the Commission is
not permitted under the Exchange Act, promptly upon written request, supply
copies of such documents (without exhibits) to any prospective Holder.
<PAGE>

                                                                             104

         SECTION 1008.  Statement by Officers as to Default.
                        ------------------------------------

         (a) The Company shall deliver to the Trustee, on the date of delivery
of each annual report to be delivered pursuant to Section 1007, a brief
certificate from the principal executive officer, principal financial officer or
principal accounting officer as to his or her knowledge of the Company's
compliance during the period covered by such report with all conditions and
covenants under this Indenture. If the signer has knowledge of any noncompliance
that occurred during such period, the certificate shall describe its status and
what action the Company has taken or is taking or proposes to take with respect
thereto. For purposes of this Section 1008(a), such compliance shall be
determined without regard to any period of grace or requirement of notice under
this Indenture.

         (b) When any Default has occurred and is continuing under this
Indenture, or if the trustee for or the holder of any other evidence of Debt of
the Company or any Restricted Subsidiary gives any notice or takes any other
action with respect to a claimed default (other than with respect to Debt in the
principal amount of less than $25,000,000 or its foreign currency equivalent at
the time), the Company shall, within 30 days of such occurrence, notice or other
action, deliver to the Trustee by registered or certified mail or by telegram,
telex or facsimile transmission an Officers' Certificate specifying such event,
notice or other action, its status and what action the Company is taking or
purposes to take with respect thereto.

         SECTION 1009.  Change of Control Triggering Event.
                        -----------------------------------

         (a) Upon the occurrence of a Change of Control Triggering Event, each
Holder shall have the right to require that the Company repurchase such Holder's
Securities in whole or in part in integral multiples of $1,000 principal amount
at maturity, in accordance with the procedures set forth in this Section 1009
and this Indenture.

         (b) Within 30 days of the occurrence of both a Change of Control and a
Rating Decline with respect to the Securities (a "Change of Control Triggering
Event"), the
<PAGE>

                                                                             105

Company will be required to make an Offer to Purchase all Outstanding Securities
at a price in cash equal to 101% of the Accreted Value of the Securities on the
purchase date, plus accrued and unpaid interest (if any) to such purchase date
(subject to the right of Holders of record on the relevant record date to
receive interest due on the relevant interest payment date).

         (c)  The Company and the Trustee shall perform their respective
obligations for the Offer to Purchase as specified in the Offer. Prior to the
Purchase Date, the Company shall (i) accept for payment Securities or portions
thereof tendered pursuant to the Offer, (ii) irrevocably deposit with the Paying
Agent (or, if the Company is acting as its own Paying Agent, segregate and hold
in trust as provided in Section 1003) money sufficient to pay the Purchase Price
of all Securities or portions thereof so accepted (provided that such deposit
                                                   --------
may be made no later than 11:00 A.M. New York City time on the Purchase Date if
the Company elects) and (iii) deliver or cause to be delivered to the Trustee
all Securities so accepted together with an Officers' Certificate stating the
Securities or portions thereof accepted for payment by the Company. The Paying
Agent shall promptly mail or deliver to Holders of Securities so accepted
payment in an amount equal to the Purchase Price, and the Trustee shall promptly
authenticate and mail or deliver to such Holders a new Security or Securities
equal in principal amount at maturity to any unpurchased portion of the
principal amount at maturity of the Security surrendered as requested by the
Holder. Any Security not accepted for payment shall be promptly mailed or
delivered by the Company to the Holder thereof. In the event that the aggregate
Purchase Price is less than the amount delivered by the Company to the Trustee
or the Paying Agent, the Trustee or the Paying Agent, as the case may be, shall
deliver the excess to the Company immediately after the Purchase Date.

         (d)  A "Change of Control" means the occurrence of any of the following
events:
              (i) if any "person" or "group" (as such terms are used in
         Sections 13(d) and 14(d) of the Exchange Act or any successor
         provisions to either of the foregoing), including any group acting for
         the purpose of
<PAGE>

                                                                             106

         acquiring, holding, voting or disposing of securities within the
         meaning of Rule 13d-5(b)(1) under the Exchange Act, other than any one
         or more of the Permitted Holders, becomes the "beneficial owner" (as
         defined in Rule 13d-3 under the Exchange Act, except that a person will
         be deemed to have "beneficial ownership" of all shares that any such
         person has the right to acquire, whether such right is exercisable
         immediately or only after the passage of time), directly or indirectly,
         of 35% or more of the total voting power of the Voting Stock of the
         Company; provided, however, that the Permitted Holders are the
                  --------  -------
         "beneficial owners" (as defined in Rule 13d-3 under the Exchange Act,
         except that a person will be deemed to have "beneficial ownership" of
         all shares that any such person has the right to acquire, whether such
         right is exercisable immediately or only after the passage of time),
         directly or indirectly, in the aggregate of a lesser percentage of the
         total voting power of the Voting Stock of the Company than such other
         person or group (for purposes of this clause (i), such person or group
         shall be deemed to beneficially own any Voting Stock of a corporation
         (the "specified corporation") held by any other corporation (the
         "parent corporation") so long as such person or group beneficially
         owns, directly or indirectly, in the aggregate a majority of the total
         voting power of the Voting Stock of such parent corporation); or

               (ii) the sale, transfer, assignment, lease, conveyance or
         other disposition, directly or indirectly, of all or substantially all
         the assets of the Company and the Restricted Subsidiaries, considered
         as a whole (other than a disposition of such assets as an entirety or
         virtually as an entirety to a Wholly Owned Restricted Subsidiary or one
         or more Permitted Holders) shall have occurred; or

               (iii) during any period of two consecutive years, individuals
         who at the beginning of such period constituted the Board of Directors
         (together with any new directors whose election or appointment by such
         board or whose nomination for election by the shareholders of the
         Company was approved by a vote of a majority of the directors then
         still in office who were
<PAGE>

                                                                             107

         either directors at the beginning of such period or whose election or
         nomination for election was previously so approved) cease for any
         reason to constitute a majority of the Board of Directors then in
         office; or

             (iv) the shareholders of the Company shall have approved any
         plan of liquidation or dissolution of the Company.

         (e) The Company shall not be required to make an Offer to Purchase upon
a Change of Control Triggering Event if a third party makes the Offer to
Purchase in the manner, at the times and otherwise in compliance with the
requirements set forth in this Indenture applicable to an Offer to Purchase made
by the Company and purchases all Securities validly tendered and not withdrawn
under such Offer to Purchase.

         (f) In the event that the Company makes an Offer to Purchase the
Securities, the Company shall comply with any applicable securities laws and
regulations, including any applicable requirements of Section 14(e) of, and Rule
14e-1 under, the Exchange Act. To the extent that the provisions of any
securities laws or regulations conflict with provisions of this Section, the
Company shall comply with the applicable securities laws and regulations and
shall not be deemed to have breached its obligations under this Section by
virtue thereof.
<PAGE>

                                                                             108

     SECTION 1010.  Limitation on Consolidated Debt.
                    --------------------------------

     (a) The Company shall not, and shall not permit any Restricted Subsidiary
to, directly or indirectly, Incur any Debt, unless, after giving pro forma
effect to such Incurrence and the receipt and application of the net proceeds
thereof, no Default or Event of Default would occur as a consequence of such
Incurrence or be continuing following such Incurrence and either (i) the ratio
of (A) the aggregate consolidated principal amount (or, in the case of Debt
issued at a discount, the then-Accreted Value) of Debt of the Company and its
Restricted Subsidiaries outstanding as of the most recent available quarterly or
annual balance sheet, after giving pro forma effect to the Incurrence of such
Debt and any other Debt Incurred or repaid since such balance sheet date and the
receipt and application of the net proceeds thereof, to (B) Consolidated Cash
Flow Available for Fixed Charges for the four full fiscal quarters next
preceding the Incurrence of such Debt for which consolidated financial
statements are available, would be less than 5.0 to 1.0, or (ii) the Company's
Consolidated Capital Ratio as of the most recent available quarterly or annual
balance sheet, after giving pro forma effect to (x) the Incurrence of such Debt
and any other Debt Incurred or repaid since such balance sheet date, (y) the
issuance of any Capital Stock (other than Disqualified Stock) of the Company
since such balance sheet date, including the issuance of any Capital Stock to be
issued concurrently with the Incurrence of such Debt, and (z) the receipt and
application of the net proceeds of such Debt or Capital Stock, as the case may
be, is less than 2.25 to 1.0.

     (b) Notwithstanding the foregoing limitation, the Company or any Restricted
Subsidiary may Incur any and all of the following (each of which shall be given
independent effect):

     (i) Debt under the Securities, this Indenture or any Restricted Subsidiary
Guarantee;

     (ii) Debt under Credit Facilities in an aggregate principal amount
outstanding or available (together with all refinancing Debt outstanding or
available pursuant to clause (viii) below in respect of Debt previously Incurred
pursuant to this clause (ii)) at any one time not to exceed the
<PAGE>

                                                                             109

greater of (x) $750,000,000, which amount shall be permanently reduced by the
amount of Net Available Proceeds used to repay Debt under the Credit Facilities,
and not reinvested in Telecommunications/IS Assets or used to purchase
Securities or repay other Debt, pursuant to and as permitted by Section 1016,
and (y) 85% of the Eligible Receivables;

     (iii) Purchase Money Debt, provided that the amount of such Purchase Money
                                --------
Debt does not exceed 100% of the cost of the construction, installation,
acquisition, lease, development or improvement of the applicable
Telecommunications/IS Assets;

     (iv) Subordinated Debt of the Company; provided, however, that the
                                            --------  -------
aggregate principal amount (or, in the case of Debt issued at a discount, the
Accreted Value) of such Debt, together with any other outstanding Debt Incurred
pursuant to this clause (iv), shall not exceed $500,000,000 at any one time
(which amount shall be permanently reduced by the amount of Net Available
Proceeds used to repay Subordinated Debt of the Company, and not reinvested in
Telecommunications/IS Assets or used to purchase Securities or repay other Debt,
pursuant to and as permitted by Section 1016), except to the extent such Debt in
excess of $500,000,000 (A) is subordinated to all other Debt of the Company
other than Debt Incurred pursuant to this clause (iv) in excess of such
$500,000,000 limitation, (B) does not provide for the payment of cash interest
on such Debt prior to the Stated Maturity of the Securities and (C) (1) does not
provide for payments of principal of such Debt at stated maturity or by way of a
sinking fund applicable thereto or by way of any mandatory redemption,
defeasance, retirement or repurchase thereof by the Company (including any
redemption, retirement or repurchase which is contingent upon events or
circumstances, but excluding any retirement required by virtue of the
acceleration of any payment with respect to such Debt upon any event of default
thereunder), in each case on or prior to the Stated Maturity of the Securities,
and (2) does not permit redemption or other retirement (including pursuant to an
offer to purchase made by the Company but excluding through conversion into
Capital Stock of the Company, other than Disqualified Stock, without any payment
by the Company or its Restricted Subsidiaries to the holders thereof other than
in respect of fractional
<PAGE>

                                                                             110

shares) of such Debt at the option of the holder thereof on or prior to the
Stated Maturity of the Securities;

     (v) Debt outstanding on the Measurement Date;

     (vi) Debt owed by the Company to any Restricted Subsidiary of the Company
or Debt owed by a Restricted Subsidiary of the Company to the Company or a
Restricted Subsidiary of the Company; provided, however, that (x) upon the
                                      --------  -------
transfer, conveyance or other disposition by such Restricted Subsidiary or the
Company of any Debt so permitted to a Person other than the Company or another
Restricted Subsidiary of the Company or (y) if for any reason such Restricted
Subsidiary ceases to be a Restricted Subsidiary, the provisions of this clause
(vi) shall no longer be applicable to such Debt and such Debt shall be deemed to
have been Incurred by the issuer thereof at the time of such transfer,
conveyance or other disposition or when such Restricted Subsidiary ceases to be
a Restricted Subsidiary;

     (vii) Debt Incurred by a Person prior to the time (A) such Person became a
Restricted Subsidiary, (B) such Person merges into or consolidates with a
Restricted Subsidiary or (C) another Restricted Subsidiary merges into or
consolidates with such Person (in a transaction in which such Person becomes a
Restricted Subsidiary), which Debt was not Incurred in anticipation of such
transaction and was outstanding prior to such transaction;

     (viii) Debt Incurred to renew, extend, refinance, defease, repay, prepay,
repurchase, redeem, retire, exchange or refund (each, a "refinancing") Debt
Incurred pursuant to clause (i), (ii), (iii), (v), (vii) or (xii) of this
paragraph (b) or this clause (viii), in an aggregate principal amount (or if
issued at a discount, the then-Accreted Value) not to exceed the aggregate
principal amount (or if issued at a discount, the then-Accreted Value) of and
accrued interest on the Debt so refinanced plus the amount of any premium
required to be paid in connection with such refinancing pursuant to the terms of
the Debt so refinanced or the amount of any premium reasonably determined by the
Board of Directors as necessary to accomplish such refinancing by means of a
tender offer or privately negotiated repurchase, plus the expenses of the
Company
<PAGE>

                                                                             111

Incurred in connection with such refinancing; provided, however, that (A) the
                                              --------  -------
refinancing Debt shall not be senior in right of payment to the Debt that is
being refinanced and (B) in the case of any refinancing of Debt Incurred
pursuant to clause (i), (v), (vii) or (xii) or, if such Debt previously
refinanced Debt Incurred pursuant to any such clause, this clause (viii), the
refinancing Debt by its terms, or by the terms of any agreement or instrument
pursuant to which such Debt is issued, (x) does not provide for payments of
principal of such Debt at stated maturity or by way of a sinking fund applicable
thereto or by way of any mandatory redemption, defeasance, retirement or
repurchase thereof by the Company (including any redemption, retirement or
repurchase which is contingent upon events or circumstances, but excluding any
retirement required by virtue of the acceleration of any payment with respect to
such Debt upon any event of default thereunder), in each case prior to the time
the same are required by the terms of the Debt being refinanced and (y) does not
permit redemption or other retirement (including pursuant to an offer to
purchase made by the Company) of such Debt at the option of the holder thereof
prior to the time the same are required by the terms of the Debt being
refinanced, other than, in the case of clause (x) or (y), any such payment,
redemption or other retirement at the option of the holder of such Debt
(including pursuant to an offer to purchase made by the Company) which is
conditioned upon a change of control pursuant to provisions substantially
similar to those described under Section 1009;

     (ix) Debt (A) in respect of performance, surety or appeal bonds,
Guarantees, letters of credit or reimbursement obligations Incurred or provided
in the ordinary course of business securing the performance of contractual,
franchise, lease, self-insurance or license obligations and not in connection
with the Incurrence of Debt or (B) in respect of customary agreements providing
for indemnification, adjustment of purchase price after closing, or similar
obligations, or from Guarantees or letters of credit, surety bonds or
performance bonds securing any such obligations of the Company or any of its
Restricted Subsidiaries pursuant to such agreements, Incurred in connection with
the disposition of any business, assets or Restricted Subsidiary of the Company
(other than Guarantees of Indebtedness Incurred by any Person acquiring all or
any portion of such
<PAGE>

                                                                             112

business, assets or Restricted Subsidiary of the Company for the purpose of
financing such acquisition) and in an aggregate principal amount not to exceed
the gross proceeds actually received by the Company or any Restricted Subsidiary
in connection with such disposition;

     (x) Debt consisting of Permitted Interest Rate or Currency Protection
Agreements;

     (xi) Debt not otherwise permitted to be Incurred pursuant to clauses (i)
through (x) above or clause (xii) below, which, together with any other
outstanding Debt Incurred pursuant to this clause (xi), has an aggregate
principal amount not in excess of $50,000,000 at any time outstanding; and

     (xii) Issue Date Purchase Money Debt and Debt under the Existing Notes, the
New Convertible Notes, the Dollar Notes, the Euro Notes and the related
indentures and any restricted subsidiary Guarantees issued in accordance with
such related indentures.

     (c) Notwithstanding any other provision of this Section 1010, the maximum
amount of Debt that the Company or a Restricted Subsidiary may Incur pursuant to
this Section 1010 shall not be deemed to be exceeded due solely to the result of
fluctuations in the exchange rates of currencies.

     (d) For purposes of determining any particular amount of Debt under this
Section 1010, (i) Guarantees, Liens or obligations with respect to letters of
credit supporting Debt otherwise included in the determination of such
particular amount shall not be included and (ii) any Liens granted for the
benefit of the Securities pursuant to the provisions referred to in the first
paragraph of Section 1014 shall not be treated as Debt. For purposes of
determining any particular amount of Debt under this Section 1010, if any such
Debt denominated in a different currency is subject to a currency agreement that
constitutes a Permitted Interest Rate or Currency Protection Agreement with
respect to U.S. dollars covering all principal, premium, if any, and interest
payable on such Debt, the amount of such Debt expressed in U.S. dollars will be
as provided in such currency agreement. For purposes of
<PAGE>

                                                                             113

determining compliance with this Section 1010, in the event that an item of Debt
meets the criteria of more than one of the types of Debt described in the above
clauses, the Company, in its sole discretion, shall classify such item of Debt
and only be required to include the amount and type of such Debt in one of such
clauses.

     SECTION 1011.  Limitation on Debt of Restricted Subsidiaries.
                    ----------------------------------------------

     The Company shall not permit any Restricted Subsidiary that is not a
Guarantor to Incur any Debt except any and all of the following (each of which
shall be given independent effect):

     (i) Restricted Subsidiary Guarantees;

     (ii) Debt outstanding on the Measurement Date;

     (iii) Debt of Restricted Subsidiaries under Credit Facilities permitted to
be Incurred pursuant to clause (ii) of paragraph (b) of Section 1010;

     (iv) Purchase Money Debt of Restricted Subsidiaries permitted to be
Incurred pursuant to clause (iii) of paragraph (b) of Section 1010;

     (v) Debt owed by a Restricted Subsidiary to the Company or a Restricted
Subsidiary of the Company permitted to be Incurred pursuant to clause (vi) of
paragraph (b) of Section 1010;

     (vi) Debt of Restricted Subsidiaries consisting of Permitted Interest Rate
or Currency Protection Agreements permitted to be Incurred pursuant to clause
(x) of paragraph (b) of Section 1010;

     (vii) Debt of Restricted Subsidiaries permitted to be Incurred under clause
(vii) of paragraph (b) of Section 1010 or Issue Date Purchase Money Debt
permitted to be Incurred under clause (xii) of paragraph (b) of Section 1010;

     (viii) Debt of Restricted Subsidiaries permitted to be Incurred under
clause (ix) or (xi) of paragraph (b) of Section 1010; and
<PAGE>

                                                                             114

     (ix) Debt which is Incurred to refinance any Debt of a Restricted
Subsidiary permitted to be Incurred pursuant to clauses (i), (ii), (iii), (iv)
and (vii) of this paragraph or this clause (ix), in an aggregate principal
amount (or if issued at a discount, the then-Accreted Value) not to exceed the
aggregate principal amount (or if issued at a discount, the then-Accreted Value)
of the Debt so refinanced, plus the amount of any premium required to be paid in
connection with such refinancing pursuant to the terms of the Debt so refinanced
or the amount of any premium reasonably determined by the Board of Directors as
necessary to accomplish such refinancing by means of a tender offer or privately
negotiated repurchase, plus the amount of expenses of the Company and the
applicable Restricted Subsidiary Incurred in connection therewith; provided,
                                                                   --------
however, that, in the case of any refinancing of Debt Incurred pursuant to
-------
clause (i), (ii) or (vii) or, if such Debt previously refinanced Debt Incurred
pursuant to any such clause, this clause (ix), the refinancing Debt by its
terms, or by the terms of any agreement or instrument pursuant to which such
Debt is Incurred, (x) does not provide for payments of principal at the stated
maturity of such Debt or by way of a sinking fund applicable to such Debt or by
way of any mandatory redemption, defeasance, retirement or repurchase of such
Debt by the Company or any Restricted Subsidiary (including any redemption,
retirement or repurchase which is contingent upon events or circumstances, but
excluding any retirement required by virtue of acceleration of such Debt upon an
event of default thereunder), in each case prior to the time the same are
required by the terms of the Debt being refinanced and (y) does not permit
redemption or other retirement (including pursuant to an offer to purchase made
by the Company or a Restricted Subsidiary) of such Debt at the option of the
holder thereof prior to the stated maturity of the Debt being refinanced, other
than, in the case of clause (x) or (y), any such payment, redemption or other
retirement (including pursuant to an offer to purchase made by the Company or a
Restricted Subsidiary) which is conditioned upon the change of control of the
Company pursuant to provisions substantially similar to those contained in
Section 1009.

     Notwithstanding any other provision of this Section 1011, the maximum
amount of Debt that a Restricted
<PAGE>

                                                                             115

Subsidiary may Incur pursuant to this Section 1011 shall not be deemed to be
exceeded due solely as the result of fluctuations in the exchange rates of
currencies.

     For purposes of determining any particular amount of Debt under this
Section 1011, Guarantees, Liens or obligations with respect to letters of credit
supporting Debt otherwise included in the determination of such particular
amount shall not be included. For purposes of determining compliance with this
Section 1011, in the event that an item of Debt meets the criteria of more than
one of the types of Debt described in the above clauses, the Company, in its
sole discretion, shall classify such item of Debt and only be required to
include the amount and type of such Debt in one of such clauses.

     SECTION 1012.  Limitation on Restricted Payments.
                    ----------------------------------
<PAGE>

                                                                             116

     (a) The Company (i) shall not, and shall not permit any Restricted
Subsidiary to, directly or indirectly, declare or pay any dividend, or make any
distribution, in respect of its Capital Stock or to the holders thereof,
excluding any dividends or distributions which are made solely to the Company or
a Restricted Subsidiary (and, if such Restricted Subsidiary is not a Wholly
Owned Subsidiary, to the other stockholders of such Restricted Subsidiary on a
pro rata basis or on a basis that results in the receipt by the Company or a
Restricted Subsidiary of dividends or distributions of greater value than it
would receive on a pro rata basis) or any dividends or distributions payable
solely in shares of Capital Stock of the Company (other than Disqualified Stock)
or in options, warrants or other rights to acquire Capital Stock of the Company
(other than Disqualified Stock); (ii) shall not, and shall not permit any
Restricted Subsidiary to, purchase, redeem, or otherwise retire or acquire for
value (x) any Capital Stock of the Company or any Restricted Subsidiary of the
Company or (y) any options, warrants or rights to purchase or acquire shares of
Capital Stock of the Company or any Restricted Subsidiary or any securities
convertible or exchangeable into shares of Capital Stock of the Company or any
Restricted Subsidiary, except, in any such case, any such purchase, redemption
or retirement or acquisition for value (A) paid to the Company or a Restricted
Subsidiary (or, in the case of any such purchase, redemption or other retirement
or acquisition for value with respect to a Restricted Subsidiary that is not a
Wholly Owned Subsidiary, to the other stockholders of such Restricted Subsidiary
on a pro rata basis or on a basis that results in the receipt by the Company or
a Restricted Subsidiary of payments of greater value than it would receive on a
pro rata basis) or (B) paid solely in shares of Capital Stock (other than
Disqualified Stock) of the Company; (iii) shall not make, or permit any
Restricted Subsidiary to make, any Investment (other than an Investment in the
Company or a Restricted Subsidiary or a Permitted Investment) in any Person,
including the Designation of any Restricted Subsidiary as an Unrestricted
Subsidiary, or the Revocation of any such Designation, according to Section
1020; (iv) shall not, and shall not permit any Restricted Subsidiary to, redeem,
defease, repurchase, retire or otherwise acquire or retire for value, prior to
any scheduled maturity, repayment or sinking fund payment, Debt of the Company
which is
<PAGE>

                                                                             117

subordinate in right of payment to the Securities (other than any redemption,
defeasance, repurchase, retirement or other acquisition or retirement for value
made in anticipation of satisfying a scheduled maturity, repayment or sinking
fund obligation due within one year thereof); and (v) shall not, and shall not
permit any Restricted Subsidiary to, issue, transfer, convey, sell or otherwise
dispose of Capital Stock of any Restricted Subsidiary to a Person other than the
Company or another Restricted Subsidiary if the result thereof is that such
Restricted Subsidiary shall cease to be a Restricted Subsidiary, in which event
the amount of such "Restricted Payment" shall be the Fair Market Value of the
remaining interest, if any, in such former Restricted Subsidiary held by the
Company and the other Restricted Subsidiaries (each of clauses (i) through (v)
being a "Restricted Payment") if: (1) an Event of Default, or an event that with
the passing of time or the giving of notice, or both, would constitute an Event
of Default, shall have occurred and be continuing, or (2) upon giving effect to
such Restricted Payment, the Company could not Incur at least $1.00 of
additional Debt pursuant to paragraph (a) of Section 1010, or (3) upon giving
effect to such Restricted Payment, the aggregate of all Restricted Payments made
on or after the Measurement Date, including Restricted Payments made pursuant to
clause (A) or (B) of the proviso at the end of this sentence, and Permitted
Investments made on or after the Measurement Date pursuant to clause (i) or (j)
of the definition thereof (the amount of any such Restricted Payment or
Permitted Investment, if made other than in cash, to be based upon Fair Market
Value) exceeds the sum of: (a) 50% of cumulative Consolidated Net Income (or, in
the case that Consolidated Net Income shall be negative, 100% of such negative
amount) since the end of the last full fiscal quarter prior to the Measurement
Date through the last day of the last full fiscal quarter ending at least 45
days prior to the date of such Restricted Payment and (b) plus, in the case of
any Revocation made after the Measurement Date, an amount equal to the lesser of
the portion (proportionate to the Company's equity interest in the Subsidiary to
which such Revocation relates) of the Fair Market Value of the net assets of
such Subsidiary at the time of Revocation and the amount of Investments
previously made (and treated as a Restricted Payment) by the Company or any
Restricted Subsidiary in such Subsidiary; provided, however, that the Company or
                                          --------  -------
a Restricted
<PAGE>

                                                                             118

Subsidiary of the Company may, without regard to the limitations in clause (3)
but subject to clauses (1) and (2), make (A) Restricted Payments in an aggregate
amount not to exceed the sum of $50,000,000 and the aggregate net cash proceeds
received after the Measurement Date (i) as capital contributions to the Company,
from the issuance (other than to a Subsidiary or an employee stock ownership
plan or trust established by the Company or any such Subsidiary for the benefit
of their employees) of Capital Stock (other than Disqualified Stock) of the
Company, and (ii) from the issuance or sale of Debt of the Company or any
Restricted Subsidiary (other than to a Subsidiary, the Company or an employee
stock ownership plan or trust established by the Company or any such Subsidiary
for the benefit of their employees) that after the Measurement Date has been
converted into or exchanged for Capital Stock (other than Disqualified Stock) of
the Company and (B) Investments in Persons engaged in the Telecommunications/IS
Business in an aggregate amount not to exceed the after-tax gain on the sale,
after the Measurement Date, of Special Assets to the extent sold for cash, Cash
Equivalents, Telecommunications/IS Assets or the assumption of Debt of the
Company or any Restricted Subsidiary (other than Debt that is subordinated to
the Securities or any applicable Restricted Subsidiary Guarantee) and release of
the Company and all Restricted Subsidiaries from all liability on the Debt
assumed. The aggregate net cash proceeds referred to in the immediately
preceding clauses (A)(i) and (A)(ii) shall not be utilized to make Restricted
Payments pursuant to such clauses to the extent such proceeds have been utilized
to make Permitted Investments under clause (i) of the definition of "Permitted
Investments."

     (b) Notwithstanding the foregoing limitation, (i) the Company may pay any
dividend on Capital Stock of any class of the Company within 60 days after the
declaration thereof if, on the date when the dividend was declared, the Company
could have paid such dividend in accordance with the foregoing provisions;
provided, however, that at the time of such payment of such dividend, no other
--------  -------
Event of Default shall have occurred and be continuing (or result therefrom);
(ii) the Company may repurchase any shares of its Common Stock or options to
acquire its Common Stock from Persons who were formerly directors, officers or
employees of the Company or any of its Subsidiaries or other Affiliates in an
<PAGE>

                                                                             119

amount not to exceed $3,000,000 in any 12-month period; (iii) the Company and
any Restricted Subsidiary may refinance any Debt otherwise permitted by clause
(viii) of paragraph (b) of Section 1010 or clause (ix) of Section 1011; (iv) the
Company and any Restricted Subsidiary may retire or repurchase any Capital Stock
of the Company or of any Restricted Subsidiary or any Subordinated Debt of the
Company in exchange for, or out of the proceeds of the substantially concurrent
sale (other than to a Subsidiary of the Company or an employee stock ownership
plan or trust established by the Company or any such Subsidiary for the benefit
of their employees) of, Capital Stock (other than Disqualified Stock) of the
Company, provided that the proceeds from any such exchange or sale of Capital
         --------
Stock shall be excluded from any calculation pursuant to clause (A)(i) in the
proviso at the end of paragraph (a) above or pursuant to clause (b) of the
definition of "Invested Capital"; and (v) the Company may pay cash dividends in
any amount not in excess of $50,000,000 in any 12-month period in respect of
Preferred Stock of the Company (other than Disqualified Stock). The Restricted
Payments described in the foregoing clauses (i), (ii) and (v) shall be included
in the calculation of Restricted Payments; the Restricted Payments described in
clauses (iii) and (iv) shall be excluded in the calculation of Restricted
Payments.

     SECTION 1013. Limitation on Dividend and Other Payment Restrictions
                   -----------------------------------------------------
Affecting Restricted Subsidiaries.
----------------------------------

     (a) The Company shall not, and shall not permit any Restricted Subsidiary
to, directly or indirectly, create or otherwise cause or suffer to exist or
become effective any consensual encumbrance or restriction (other than pursuant
to law or regulation) on the ability of any Restricted Subsidiary (i) to pay
dividends (in cash or otherwise) or make any other distributions in respect of
its Capital Stock owned by the Company or any other Restricted Subsidiary or pay
any Debt or other obligation owed to the Company or any other Restricted
Subsidiary, (ii) to make loans or advances to the Company or any other
Restricted Subsidiary or (iii) to transfer any of its Property to the Company or
any other Restricted Subsidiary.

     (b) Notwithstanding the foregoing limitation, the Company may, and may
permit any Restricted Subsidiary to,
<PAGE>

                                                                             120

create or otherwise cause or suffer to exist (i) any encumbrance or restriction
pursuant to any agreement in effect on the Measurement Date, (ii) any customary
(as conclusively determined in good faith by the Chief Financial Officer of the
Company) encumbrance or restriction applicable to a Restricted Subsidiary that
is contained in an agreement or instrument governing or relating to Debt
contained in any Credit Facilities or Purchase Money Debt, provided that such
                                                           --------
encumbrances and restrictions permit the distribution of funds to the Company in
an amount sufficient for the Company to make the timely payment of interest,
premium (if any) and principal (whether at stated maturity, by way of a sinking
fund applicable thereto, by way of any mandatory redemption, defeasance,
retirement or repurchase thereof, including upon the occurrence of designated
events or circumstances or by virtue of acceleration upon an event of default,
or by way of redemption or retirement at the option of the holder of the Debt,
including pursuant to offers to purchase) according to the terms of this
Indenture and the Securities and other Debt that is solely an obligation of the
Company, but provided further that such agreement may nevertheless contain
             ----------------
customary (as so determined) net worth, leverage, invested capital and other
financial covenants, customary (as so determined) covenants regarding the merger
of or sale of all or any substantial part of the assets of the Company or any
Restricted Subsidiary, customary (as so determined) restrictions on transactions
with affiliates and customary (as so determined) subordination provisions
governing Debt owed to the Company or any Restricted Subsidiary, (iii) any
encumbrance or restriction pursuant to an agreement relating to any Acquired
Debt, which encumbrance or restriction is not applicable to any Person, or the
properties or assets of any Person, other than the Person so acquired, (iv) any
encumbrance or restriction pursuant to an agreement effecting a refinancing of
Debt Incurred pursuant to an agreement referred to in clause (i), (ii) or (iii)
of this paragraph (b), provided, however, that the provisions contained in such
                       --------  -------
agreement relating to such encumbrance or restriction are no more restrictive
(as so determined) in any material respect than the provisions contained in the
agreement the subject thereof, (v) in the case of clause (iii) of paragraph (a)
above, any encumbrance or restriction contained in any security agreement
(including a Capital Lease Obligation) securing Debt of the Company or a
<PAGE>

                                                                             121

Restricted Subsidiary otherwise permitted under this Indenture, but only to the
extent such restrictions restrict the transfer of the Property subject to such
security agreement, (vi) in the case of clause (iii) of paragraph (a) above,
customary provisions (A) that restrict the subletting, assignment or transfer of
any Property that is a lease, license, conveyance or similar contract, (B)
contained in asset sale or other asset disposition agreements limiting the
transfer of the Property being sold or disposed of pending the closing of such
sale or disposition or (C) arising or agreed to in the ordinary course of
business, not relating to any Debt, and that do not, individually or in the
aggregate, detract from the value of Property of the Company or any Restricted
Subsidiary in any manner material to the Company or any Restricted Subsidiary,
(vii) any encumbrance or restriction with respect to a Restricted Subsidiary
imposed pursuant to an agreement which has been entered into for the sale or
disposition of all or substantially all of the Capital Stock or Property of such
Restricted Subsidiary, provided that the consummation of such transaction would
                       --------
not result in a Default or an Event of Default, that such restriction terminates
if such transaction is abandoned and that the consummation or abandonment of
such transaction occurs within one year of the date such agreement was entered
into, and (viii) any encumbrance or restriction pursuant to this Indenture and
the Securities.

     SECTION 1014.  Limitation on Liens.
                    --------------------

     The Company shall not, and shall not permit any Restricted Subsidiary to,
directly or indirectly, Incur or suffer to exist any Lien on or with respect to
any Property now owned or acquired after the Measurement Date to secure any Debt
without making, or causing such Restricted Subsidiary to make, effective
provision for securing the Securities (x) equally and ratably with such Debt as
to such Property for so long as such Debt will be so secured or (y) in the event
such Debt is Debt of the Company or a Guarantor which is subordinate in right of
payment to the Securities or the applicable Restricted Subsidiary Guarantee,
prior to such Debt as to such Property for so long as such Debt will be so
secured.
<PAGE>

                                                                             122

     The foregoing restrictions shall not apply to: (i) Liens existing on the
Measurement Date and securing Debt outstanding on the Measurement Date or
Incurred by the Company or a Restricted Subsidiary on or after the Measurement
Date pursuant to any Credit Facility to secure Debt permitted to be Incurred by
the Company or such Restricted Subsidiary pursuant to clause (ii) of paragraph
(b) under Section 1010; (ii) Liens securing Debt in an amount which, together
with the aggregate amount of Debt then outstanding or available under all Credit
Facilities (together with all refinancing Debt then outstanding or available
pursuant to clause (viii) of paragraph (b) of Section 1010 in respect of Debt
previously Incurred under Credit Facilities), does not exceed 1.5 times the
Company's Consolidated Cash Flow Available for Fixed Charges for the four full
fiscal quarters preceding the Incurrence of such Lien for which the Company's
consolidated financial statements are available, determined on a pro forma basis
as if such Debt had been Incurred and the proceeds thereof had been applied at
the beginning of such four fiscal quarters; (iii) Liens in favor of the Company
or any Restricted Subsidiary; provided, however, that any subsequent issue or
                              --------  -------
transfer of Capital Stock or other event that results in any such Restricted
Subsidiary ceasing to be a Restricted Subsidiary or any subsequent transfer of
the Debt secured by any such Lien (except to the Company or a Restricted
Subsidiary) shall be deemed, in each case, to constitute the Incurrence of such
Lien by the issuer thereof; (iv) Liens Incurred by the Company or a Restricted
Subsidiary to secure Purchase Money Debt permitted to be Incurred by the Company
or such Restricted Subsidiary pursuant to clause (iii) of paragraph (b) under
Section 1010, provided that any such Lien may not extend to any Property other
              --------
than the Telecommunications/IS Assets installed, constructed, acquired, leased,
developed or improved with the proceeds of such Purchase Money Debt and any
improvements or accessions thereto (it being understood that all Debt to any
single lender or group of related lenders or outstanding under any single credit
facility, and in any case relating to the same group or collection of
Telecommunications/IS Assets financed thereby, shall be considered a single
Purchase Money Debt, whether drawn at one time or from time to time); (v) Liens
to secure Acquired Debt, provided that (a) such Lien attaches to the acquired
                         --------
Property prior to the time of the acquisition of such Property and (b) such Lien
does not
<PAGE>

                                                                             123

extend to or cover any other Property; (vi) Liens to secure Debt Incurred to
refinance, in whole or in part, Debt secured by any Lien referred to in the
foregoing clauses (i), (iv) and (v) or this clause (vi) so long as such Lien
does not extend to any other Property (other than improvements and accessions to
the original Property) and the principal amount of Debt so secured is not
increased except as otherwise permitted under clause (viii) of paragraph (b) of
Section 1010 or clause (ix) of Section 1011; (vii) Liens not otherwise permitted
by the foregoing clauses (i) through (vi) securing Debt in an aggregate amount
not to exceed 5% of the Company's Consolidated Tangible Assets; (viii) Liens
granted after the Issue Date pursuant to this Section 1014 to secure the
Securities; and (ix) Permitted Liens.

     SECTION 1015.  Limitation on Sale and Leaseback Transactions.
                    ----------------------------------------------

     The Company shall not, and shall not permit any Restricted Subsidiary to,
directly or indirectly, enter into, assume, Guarantee or otherwise become liable
with respect to any Sale and Leaseback Transaction, unless (i) the Company or
such Restricted Subsidiary would be entitled to Incur (a) Debt in an amount
equal to the Attributable Value of the Sale and Leaseback Transaction pursuant
to Section 1010 and (b) a Lien pursuant to Section 1014, equal in amount to the
Attributable Value of the Sale and Leaseback Transaction, without also securing
the Securities, and (ii) the Sale and Leaseback Transaction is treated as an
Asset Disposition and all of the conditions of Section 1016 (including the
provisions concerning the application of Net Available Proceeds) are satisfied
with respect to such Sale and Leaseback Transaction, treating all of the
consideration received in such Sale and Leaseback Transaction as Net Available
Proceeds for purposes of such Section 1015.
<PAGE>

                                                                           124

     SECTION 1016.  Limitation on Asset Dispositions.
                    ---------------------------------

     The Company shall not, and shall not permit any Restricted Subsidiary
to, make any Asset Disposition unless: (i) the Company or the Restricted
Subsidiary, as the case may be, receives consideration for such disposition at
least equal to the Fair Market Value for the Property sold or disposed of as
determined by the Board of Directors in good faith and evidenced by a Board
Resolution filed with the Trustee; and (ii) at least 75% of the consideration
for such disposition consists of cash or Cash Equivalents or the assumption of
Debt of the Company or any Restricted Subsidiary (other than Debt that is
subordinated to the Securities or any applicable Restricted Subsidiary
Guarantee) and release of the Company and all Restricted Subsidiaries from all
liability on the Debt assumed (or if less than 75%, the remainder of such
consideration consists of Telecommunications/IS Assets); provided, however,
                                                         --------  -------
that, to the extent such disposition involves Special Assets, all or any portion
of the consideration may, at the Company's election, consist of Property other
than cash, Cash Equivalents, the assumption of Debt or Telecommunications/IS
Assets.

     The Net Available Proceeds (or any portion thereof) from Asset
Dispositions may be applied by the Company or a Restricted Subsidiary, to the
extent the Company or such Restricted Subsidiary elects (or is required by the
terms of any Debt): (1) to the permanent repayment or reduction of Debt then
outstanding under any Credit Facility, to the extent such Credit Facility would
require such application or prohibit payments pursuant to the Offer to Purchase
described in the following paragraph (other than Debt owed to the Company or any
Affiliate of the Company); or (2) to reinvest in Telecommunications/IS Assets
(including by means of an Investment in Telecommunications/IS Assets by a
Restricted Subsidiary with Net Available Proceeds received by the Company or
another Restricted Subsidiary).

     Any Net Available Proceeds from an Asset Disposition not applied in
accordance with the preceding paragraph within 360 days (or, in the case of a
disposition of Special Assets identified in clause (a) of the definition thereof
in which the Net Available Proceeds exceed $500,000,000, 540 days) from the date
of the receipt of such Net Available
<PAGE>

                                                                           125

Proceeds shall constitute "Excess Proceeds." When the aggregate amount of Excess
Proceeds exceeds $10,000,000, the Company will be required to make an Offer to
Purchase with such Excess Proceeds on a pro rata basis according to principal
amount (or, in the case of Debt issued at a discount, the then-Accreted Value)
for (x) Outstanding Securities at a price in cash equal to 100% of the Accreted
Value of the Securities on the purchase date plus accrued and unpaid interest
(if any) thereon (subject to the right of Holders of record on the relevant
record date to receive interest due on the relevant interest payment date) and
(y) any other Debt of the Company or any Guarantor that is pari passu with the
                                                           ---- -----
Securities, or any Debt of a Restricted Subsidiary that is not a Guarantor, at a
price no greater than 100% of the principal amount thereof plus accrued and
unpaid interest (if any) to the purchase date (or 100% of the then-Accreted
Value plus accrued and unpaid interest (if any) to the purchase date in the case
of original issue discount Debt), to the extent, in the case of this clause (y),
required under the terms thereof (other than Debt owed to the Company or any
Affiliate of the Company). To the extent there are any remaining Excess Proceeds
following the completion of the Offer to Purchase, the Company shall apply such
Excess Proceeds to the repayment of other Debt of the Company or any Restricted
Subsidiary, to the extent permitted or required under the terms thereof. Any
other remaining Excess Proceeds may be applied to any use as determined by the
Company which is not otherwise prohibited by this Indenture, and the amount of
Excess Proceeds shall be reset to zero.

     The Company and the Trustee shall perform their respective obligations
for the Offer to Purchase as specified in the Offer. Prior to the Purchase Date,
the Company shall (i) accept for payment Securities or portions thereof tendered
pursuant to the Offer, (ii) irrevocably deposit with the Paying Agent (or, if
the Company is acting as its own Paying Agent, segregate and hold in trust as
provided in Section 1003) money sufficient to pay the Purchase Price of all
Securities or portions thereof so accepted (provided that such deposit may be
                                            --------
made no later than 11:00 A.M. New York City time on the Purchase Date if the
Company elects) and (iii) deliver or cause to be delivered to the Trustee all
Securities so accepted together with an Officers' Certificate stating the
Securities or
<PAGE>

                                                                           126

portions thereof accepted for payment by the Company. The Paying Agent shall
promptly mail or deliver to Holders of Securities so accepted payment in an
amount equal to the Purchase Price, and the Trustee shall promptly authenticate
and mail or deliver to such Holders a new Security or Securities equal in
principal amount at maturity to any unpurchased portion of the principal amount
at maturity of the Security surrendered as requested by the Holder. Any Security
not accepted for payment shall be promptly mailed or delivered by the Company to
the Holder thereof. In the event that the aggregate Purchase Price is less than
the amount delivered by the Company to the Trustee or the Paying Agent, the
Trustee or the Paying Agent, as the case may be, shall deliver the excess to the
Company immediately after the Purchase Date.

     Not later than the date upon which written notice of an Offer to
Purchase is delivered to the Trustee, the Company shall deliver to the Trustee
an Officers' Certificate as to (i) the amount of the Offer, (ii) the allocation
of the Net Available Proceeds from the Asset Disposition pursuant to which such
Offer is being made and (iii) the compliance of such allocation with the
provisions of this Section 1016.

     In the event that the Company makes an Offer to Purchase the
Securities, the Company shall comply with any applicable securities laws and
regulations, including any applicable requirements of Section 14(e) of, and Rule
14e-1 under, the Exchange Act. To the extent that the provisions of any
securities laws or regulations conflict with provisions of this Section, the
Company shall comply with the applicable securities laws and regulations and
shall not be deemed to have breached its obligations under this Section by
virtue thereof.

     SECTION 1017. Limitation on Issuance and Sales of Capital Stock of
                   ----------------------------------------------------
Restricted Subsidiaries.
------------------------
<PAGE>

                                                                           127

     The Company shall not, and shall not permit any Restricted Subsidiary to,
issue, transfer, convey, sell or otherwise dispose of any shares of Capital
Stock of a Restricted Subsidiary or securities convertible or exchangeable into,
or options, warrants, rights or any other interest with respect to, Capital
Stock of a Restricted Subsidiary to any Person other than the Company or a
Restricted Subsidiary except (i) a sale of all of the Capital Stock of such
Restricted Subsidiary owned by the Company and any Restricted Subsidiary that
complies with the provisions of Section 1016 to the extent such provisions
apply, (ii) in a transaction that results in such Restricted Subsidiary becoming
a Joint Venture, provided (x) such transaction complies with the provisions of
                 --------
Section 1016 to the extent such provisions apply and (y) the remaining interest
of the Company or any other Restricted Subsidiary in such Joint Venture would
have been permitted as a new Restricted Payment or Permitted Investment under
the provisions of Section 1012, (iii) the issuance, transfer, conveyance, sale
or other disposition of shares of such Restricted Subsidiary so long as after
giving effect to such transaction such Restricted Subsidiary remains a
Restricted Subsidiary and such transaction complies with the provisions of
Section 1016 to the extent such provisions apply, (iv) the transfer, conveyance,
sale or other disposition of shares required by applicable law or regulation,
(v) if required, the issuance, transfer, conveyance, sale or other disposition
of directors' qualifying shares, (vi) Disqualified Stock issued in exchange for,
or upon conversion of, or the proceeds of the issuance of which are used to
refinance, shares of Disqualified Stock of such Restricted Subsidiary, provided
                                                                       --------
that the amounts of the redemption obligations of such Disqualified Stock shall
not exceed the amounts of the redemption obligations of, and such Disqualified
Stock shall have redemption obligations no earlier than those required by, the
Disqualified Stock being exchanged, converted or refinanced, (vii) in a
transaction where the Company or a Restricted Subsidiary acquires at the same
time not less than its Proportionate Interest in such issuance of Capital Stock,
(viii) Capital Stock issued and outstanding on the Measurement Date, (ix)
Capital Stock of a Restricted Subsidiary issued and outstanding prior to the
time that such Person becomes a Restricted Subsidiary so long as such Capital
Stock was not issued in contemplation of such Person's becoming a Restricted
Subsidiary or
<PAGE>

                                                                           128

otherwise being acquired by the Company and (x) an issuance of Preferred Stock
of a Restricted Subsidiary (other than Preferred Stock convertible or
exchangeable into Common Stock of any Restricted Subsidiary) otherwise permitted
by this Indenture. In the event of (a) the consummation of a transaction
referred to in any of the foregoing clauses that results in a Guarantor no
longer being a Restricted Subsidiary and (b) the execution and delivery of a
supplemental indenture providing for such release in form satisfactory to the
Trustee, any such Guarantor shall be released from all its obligations under its
Restricted Subsidiary Guarantee.

     SECTION 1018.  Transactions with Affiliates.
                    -----------------------------
<PAGE>

                                                                           129

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, sell, lease, transfer, or otherwise
dispose of any of its Property to, or purchase any Property from, or enter into
any contract, agreement, understanding, loan, advance, Guarantee or transaction
(including the rendering of services) with or for the benefit of, any Affiliate
(each of the foregoing, an "Affiliate Transaction"), unless (a) such Affiliate
Transaction or series of Affiliate Transactions is (i) in the best interest of
the Company or such Restricted Subsidiary and (ii) on terms that are no less
favorable to the Company or such Restricted Subsidiary than those that would
have been obtained in a comparable arm's-length transaction by the Company or
such Restricted Subsidiary with a Person that is not an Affiliate (or, in the
event that there are no comparable transactions involving Persons who are not
Affiliates of the Company or the relevant Restricted Subsidiary to apply for
comparative purposes, is otherwise on terms that, taken as a whole, the Company
has determined to be fair to the Company or the relevant Restricted Subsidiary)
and (b) the Company delivers to the Trustee (i) with respect to any Affiliate
Transaction or series of Affiliate Transactions involving aggregate payments in
excess of $10,000,000 but less than $15,000,000, a certificate of the chief
executive, operating or financial officer of the Company evidencing such
officer's determination that such Affiliate Transaction or series of Affiliate
Transactions complies with clause (a) above and (ii) with respect to any
Affiliate Transaction or series of Affiliate Transactions involving aggregate
payments equal to or in excess of $15,000,000, a Board Resolution certifying
that such Affiliate Transaction or series of Affiliate Transactions complies
with clause (a) above and that such Affiliate Transaction or series of Affiliate
Transactions has been approved by the Board of Directors, including a majority
of the disinterested members of the Board of Directors, provided that, in the
                                                        --------
event that there shall not be at least two disinterested members of the Board of
Directors with respect to the Affiliate Transaction, the Company shall, in
addition to such Board Resolution, file with the Trustee a written opinion from
an investment banking firm of national standing in the United States which, in
the good faith judgment of the Board of Directors, is independent with respect
to the Company and its Affiliates and qualified to perform such task, which
opinion
<PAGE>

                                                                           130

shall be to the effect that the consideration to be paid or received in
connection with such Affiliate Transaction is fair, from a financial point of
view, to the Company or such Restricted Subsidiary.

     Notwithstanding the foregoing, the following shall not be deemed
Affiliate Transactions: (i) any employment agreement entered into by the Company
or any of its Restricted Subsidiaries in the ordinary course of business and
consistent with industry practice; (ii) any agreement or arrangement with
respect to the compensation of a director or officer of the Company or any
Restricted Subsidiary approved by a majority of the disinterested members of the
Board of Directors and consistent with industry practice; (iii) transactions
between or among the Company and its Restricted Subsidiaries, provided that no
                                                              --------
more than 5% of the Voting Stock (on a fully diluted basis) of any such
Restricted Subsidiary is owned by an Affiliate of the Company (other than a
Restricted Subsidiary); (iv) Restricted Payments and Permitted Investments
permitted by Section 1012 (other than Investments in Affiliates that are not the
Company or Restricted Subsidiaries); (v) transactions pursuant to the terms of
any agreement or arrangement as in effect on the Measurement Date; and (vi)
transactions with respect to wireline or wireless transmission capacity, the
lease or sharing or other use of cable or fiber optic lines, equipment,
rights-of-way or other access rights, between the Company (or any Restricted
Subsidiary) and any other Person, provided that, in the case of this clause
                                  --------
(vi), such transaction complies with clause (a) in the immediately preceding
paragraph.

     SECTION 1019.  Calculation of Original Issue Discount.
                    ---------------------------------------

     Within 30 days after the end of each calendar year, the Company shall
deliver to the Trustee a certificate setting forth the following:

          (a)  the total cumulative amount of "Original Issue Discount",
     as defined by the Code, that had accrued on the Notes as of December 31
     of such calendar year; and

          (b)  the portion of such Original Issue Discount that had
     accrued during such calendar year.
<PAGE>

                                                                           131

     SECTION 1020.  Limitation on Designations of Unrestricted Subsidiaries.
                    --------------------------------------------------------

     The Company shall not designate any Subsidiary of the Company (other
than a newly created Subsidiary in which no Investment has previously been made)
as an "Unrestricted Subsidiary" under this Indenture (a "Designation") unless:

          (a)  no Default or Event of Default shall have occurred and be
     continuing at the time of or after giving effect to such Designation;

          (b)  immediately after giving effect to such Designation, the
     Company would be able to Incur $1.00 of Debt under paragraph (a) of
     Section 1010; and

          (c)  the Company would not be prohibited under any provision of
     this Indenture from making an Investment at the time of Designation
     (assuming the effectiveness of such Designation) in an amount (the
     "Designation Amount") equal to the portion (proportionate to the Company's
     equity interest in such Restricted Subsidiary) of the Fair Market Value of
     the net assets of such Restricted Subsidiary on such date.

     In the event of any such Designation, the Company shall be deemed to
have made an Investment constituting a Restricted Payment pursuant to Section
1012 for all purposes of this Indenture in the Designation Amount; provided,
                                                                   --------
however, that, upon a Revocation of any such Designation of a Subsidiary, the
-------
Company shall be deemed to continue to have a permanent "Investment" in an
Unrestricted Subsidiary of an amount (if positive) equal to (i) the Company's
"Investment" in such Subsidiary at the time of such Revocation less (ii) the
portion (proportionate to the Company's equity interest in such Subsidiary) of
the Fair Market Value of the net assets of such Subsidiary at the time of such
Revocation. At the time of any Designation of any Subsidiary as an Unrestricted
Subsidiary, such Subsidiary shall not own any Capital Stock of the Company or
any Restricted Subsidiary. In addition, neither the Company nor any Restricted
Subsidiary shall at any time (x) provide credit support for, or a Guarantee of,
any Debt of any Unrestricted Subsidiary (including any undertaking, agreement or
instrument evidencing such Debt); provided that
                                  --------
<PAGE>

                                                                           132

the Company or a Restricted Subsidiary may pledge Capital Stock or Debt of any
Unrestricted Subsidiary on a nonrecourse basis such that the pledgee has no
claim whatsoever against the Company other than to obtain such pledged Capital
Stock or Debt, (y) be directly or indirectly liable for any Debt of any
Unrestricted Subsidiary or (z) be directly or indirectly liable for any Debt
which provides that the holder thereof may (upon notice, lapse of time or both)
declare a default thereon or cause the payment thereof to be accelerated or
payable prior to its final scheduled maturity upon the occurrence of a default
with respect to any Debt, Lien or other obligation of any Unrestricted
Subsidiary (including any right to take enforcement action against such
Unrestricted Subsidiary), except in the case of clause (x) or (y) to the extent
permitted under Sections 1012 and 1018.

     Unless Designated as an Unrestricted Subsidiary, any Person that
becomes a Subsidiary of the Company will be classified as a Restricted
Subsidiary; provided, however, that such Subsidiary shall not be designated as a
            --------  -------
Restricted Subsidiary and shall be automatically classified as an Unrestricted
Subsidiary if either of the requirements set forth in clauses (a) and (b) of the
immediately following paragraph will not be satisfied immediately following such
classification. Except as provided in the first sentence of this Section 1020,
no Restricted Subsidiary may be redesignated as an Unrestricted Subsidiary.

     A Designation may be revoked (a "Revocation") by a Board Resolution
delivered to the Trustee, provided that the Company will not make any Revocation
                          --------
unless:

          (a)  no Default or Event of Default shall have occurred and be
     continuing at the time of and after giving effect to such Revocation; and

          (b)  all Liens and Debt of such Unrestricted Subsidiary
     outstanding immediately following such Revocation would, if Incurred at
     such time, have been permitted to be Incurred at such time for all
     purposes of this Indenture.

     All Designations and Revocations must be evidenced by Board Resolutions
delivered to the Trustee (i) certifying
<PAGE>

                                                                           133

compliance with the foregoing provisions and (ii) giving the effective date of
such Designation or Revocation, such delivery to the Trustee to occur within 45
days after the end of the fiscal quarter of the Company in which such
Designation or Revocation is made (or, in the case of a Designation or
Revocation made during the last fiscal quarter of the Company's fiscal year,
within 90 days after the end of such fiscal year). Upon Designation of a
Restricted Subsidiary as an Unrestricted Subsidiary in compliance with this
Section 1020, such Restricted Subsidiary shall, by delivery of a supplemental
indenture providing for such release in form satisfactory to the Trustee, be
released from any Restricted Subsidiary Guarantee previously made by such
Subsidiary.

                                ARTICLE ELEVEN

                           REDEMPTION OF SECURITIES

     SECTION 1101.  Right of Redemption.
                    --------------------

     The Securities will be subject to redemption at the option of the
Company, in whole or in part, at any time or from time to time, upon not less
than 30 nor more than 60 days' prior notice, on the terms and at the redemption
prices (expressed as percentages of Accreted Value) set forth in the second and
third paragraphs on the reverse of the form of Security, plus accrued and unpaid
interest thereon (if any) to the Redemption Date (subject to the right of
Holders of record on the relevant record date to receive interest due on the
relevant interest payment date).

     SECTION 1102.  Applicability of Article.
                    -------------------------

     This Article shall govern any redemption of the Securities pursuant to
Section 1101.

     SECTION 1103.  Election to Redeem; Notice to Trustee.
                    --------------------------------------

     The election of the Company to redeem any Securities pursuant to
Section 1101 shall be evidenced by a Board Resolution. The Company shall, at
least 60 days prior to the Redemption Date fixed by the Company (unless a
shorter notice shall be satisfactory to the Trustee), notify the
<PAGE>

                                                                           134

Trustee of such Redemption Date and of the Accreted Value of Securities to be
redeemed and shall deliver to the Trustee such documentation and records as
shall enable the Trustee to select the Securities to be redeemed pursuant to
Section 1104. Such notice shall be accompanied by an Officers' Certificate and
an Opinion of Counsel from the Company to the effect that such redemption will
comply with the conditions herein .

     SECTION 1104.  Selection by Trustee of Securities to Be Redeemed.
                    --------------------------------------------------

     If less than all the Securities 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 not previously
called for redemption, in compliance with the requirements of the principal
national securities exchange, if any, on which the Securities are listed, or, if
the Securities are not so listed, on a pro rata basis, by lot or by such other
method as the Trustee shall deem fair and appropriate and which may provide for
the selection for redemption of portions of the Accreted Value of Securities;
provided, however, that no such partial redemption shall reduce the portion of
--------  -------
the principal amount at maturity of a Security not redeemed to less than $1,000.

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

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

     SECTION 1105.  Notice of Redemption.
                    ---------------------

     Notice of redemption shall be given in the manner provided for in
Section 106 not less than 30 nor more than 60 days prior to the Redemption Date,
to each Holder of Securities to be redeemed.
<PAGE>

                                                                           135

     Each notice of redemption shall state:

     (1)  the Redemption Date,

     (2)  the Redemption Price and the amount of accrued interest to the
Redemption Date payable as provided in Section 1107, if any,

     (3)  if less than all Outstanding Securities are to be redeemed, the
identification (and, in the case of a partial redemption, the principal amounts
at maturity) of the particular Securities to be redeemed,

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

     (5)  that on the Redemption Date the Redemption Price (and unpaid and
accrued interest, if any, to the Redemption Date payable as provided in Section
1107) will become due and payable upon each such Security, or the portion
thereof, to be redeemed, and that, unless the Company defaults in making such
redemption payment or the Trustee or the Paying Agent is prohibited from making
such payment, interest thereon will cease to accrue on and after said date, and

     (6)  the place or places where such Securities are to be presented and
surrendered for payment of the Redemption Price and accrued interest, if any.

     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 1106.  Deposit of Redemption Price.
                    ----------------------------

     On or prior to any Redemption Date (and if on any Redemption Date,
before 11:00 A.M. New York City time, on such 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
<PAGE>

                                                                           136

Section 1003) an amount of money sufficient to pay the Redemption Price of, and
unpaid and accrued interest (subject to the right of Holders of record on the
relevant record date to receive interest due on the relevant interest payment
date) on, all the Securities which are to be redeemed on that date.

     SECTION 1107.  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 (together with unpaid and 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 or the Trustee or the Paying Agent shall be prohibited from making such
payment) such Securities shall cease to bear interest. Upon surrender of any
such Security for redemption in accordance with said notice, such Security shall
be paid by the Company at the Redemption Price, together with unpaid and accrued
interest, if any, to the Redemption Date; provided, however, that installments
                                          --------  -------
of interest 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 Security called for redemption shall not be so paid upon
surrender thereof for redemption, the Accreted Value (and premium, if any)
shall, until paid, bear interest from the Redemption Date at the rate borne by
the Securities.

     SECTION 1108.  Securities Redeemed in Part.
                    ----------------------------

     Any Security which is to be redeemed only in part shall be surrendered
at the office or agency of the Company maintained for such purpose pursuant to
Section 1002 (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 such Holder's attorney duly
authorized in writing), and the Company shall execute, and the Trustee
<PAGE>

                                                                           137

shall authenticate and deliver to the Holder of such Security without service
charge, a new Security or Securities, of any authorized denomination as
requested by such Holder, in aggregate Accreted Value equal to and in exchange
for the unredeemed portion of the Accreted Value of the Security so surrendered.

                                ARTICLE TWELVE

                      DEFEASANCE AND COVENANT DEFEASANCE

     SECTION 1201.  Company's Option to Effect Defeasance or Covenant
                    -------------------------------------------------
Defeasance.
-----------

     The Company may, at its option by Board Resolution, at any time, with
respect to the Securities, elect to have either Section 1202 or Section 1203 be
applied to all Outstanding Securities upon compliance with the conditions set
forth below in this Article Twelve.

     SECTION 1202.  Defeasance and Discharge.
                    -------------------------
<PAGE>

                                                                           138

     Upon the Company's exercise under Section 1201 of the option applicable
to this Section 1202, the Company shall be deemed to have been discharged from
its obligations with respect to all Outstanding Securities on the date the
conditions set forth in Section 1204 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 the Outstanding
Securities, which shall thereafter be deemed to be "Outstanding" only for the
purposes of Section 1205 and the other Sections of this Indenture referred to in
clauses (A) and (B) below, and to have satisfied all its other obligations under
such Securities and this Indenture insofar as such Securities are concerned (and
the Trustee, at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following which shall survive until
otherwise terminated or discharged hereunder: (A) the Company's obligations with
respect to such Securities under Sections 304, 305, 306, 1002 and 1003 and the
Company's rights under Section 1101, (B) rights of Holders to receive payment of
Accreted Value of, premium, if any, and interest on such Securities (but not the
Purchase Price referred to under Section 1009 or 1016) and any rights of the
Holders with respect to such amounts, (C) the rights, obligations and immunities
of the Trustee under the Indenture and (D) this Article Twelve. Subject to
compliance with this Article Twelve, the Company may exercise its option under
this Section 1202 notwithstanding the prior exercise of its option under Section
1203 with respect to the Securities. If the Company exercises its option under
this Section 1202, each Guarantor, if any, shall be released from all its
obligations under its Restricted Subsidiary Guarantee.

     SECTION 1203.  Covenant Defeasance.
                    --------------------

     Upon the Company's exercise under Section 1201 of the option applicable
to this Section 1203, the Company shall be released from its obligations under
any covenant contained in Sections 801(3), (4) and (5), in Sections 803, 1005,
1006 and 1007 and Sections 1009 through 1020 and from the operation of Sections
501(6), (7), (8), (9) and (10) (but, in the case of Sections 501(9) and (10),
with respect only to Significant Subsidiaries), with respect to the Outstanding
Securities on and after the date the conditions
<PAGE>

                                                                           139

set forth below are satisfied (hereinafter, "covenant defeasance"), and the
Securities shall thereafter be deemed not to be "Outstanding" for the purposes
of any direction, waiver, consent, declaration or other Act of Holders (and the
consequences of any thereof) in connection with such provisions, but shall
continue to be deemed "Outstanding" for all other purposes hereunder. For this
purpose, such covenant defeasance means that, with respect to the Outstanding
Securities, the Company may omit to comply with and shall have no liability in
respect of any term, condition or limitation set forth in any such provision,
whether directly or indirectly, by reason of any reference elsewhere herein to
any such provision or by reason of any reference in any such provision 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), (4),
(5), (6), (7), (8), (9) or (10) (but, in the case of Section 501(9) or (10),
with respect only to Significant Subsidiaries) but, except as specified above,
the remainder of this Indenture and such Securities shall be unaffected thereby.
If the Company exercises its option under this Section 1203, each Guarantor, if
any, shall be released from all its obligations under its Restricted Subsidiary
Guarantee.
<PAGE>

                                                                             140

          SECTION 1204.  Conditions to Defeasance or Covenant Defeasance.
                        ------------------------------------------------

          The following shall be the conditions to application of either Section
1202 or Section 1203 to the Outstanding Securities:

          (1)  The Company shall irrevocably have deposited or caused to be
deposited with the Trustee (or another trustee satisfying the requirements of
Section 608 who shall agree to comply with the provisions of this Article Twelve
applicable to it) as trust funds in trust for the purpose of making the
following payments, specifically pledged as security for, and dedicated solely
to, the benefit of the Holders of such Securities, at any time prior to the
Maturity of the Securities: (A) money in an amount, or (B) Government Securities
which through the payment of interest and principal will provide, not later than
one day before the due date of payment in respect of the Securities, money in an
amount, or (C) a combination thereof, sufficient, in the opinion of a nationally
recognized firm of independent public accountants expressed in a written
certification thereof delivered to the Trustee, to pay and discharge the
Accreted Value of (and premium, if any, on) and interest on, the Outstanding
Securities on the Stated Maturity (or Redemption Date, if applicable); provided
                                                                       --------
that the Trustee (or such other trustee) shall have been irrevocably instructed
in writing to apply such money or the proceeds of such Government Securities to
said payments with respect to the Securities. Before such a deposit, the Company
may give to the Trustee, in accordance with Section 1103, a notice of its
election to redeem all of the Outstanding Securities at a future date in
accordance with Article Eleven, which notice shall be irrevocable. Such
irrevocable redemption notice, if given, shall be given effect in applying the
foregoing.

          (2) No Default or Event of Default with respect to the Securities
shall have occurred and be continuing on the date of such deposit or, insofar as
paragraphs (9) and (10) of Section 501 are concerned with respect to the
Company, at any time during the period ending on the 123rd day after the date of
such deposit (it being understood that this condition shall not be deemed
satisfied until the expiration of such period).
<PAGE>

                                                                             141

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

          (4)  In the case of an election under Section 1202, the Company shall
have delivered to the Trustee an Opinion of Counsel stating that (x) the Company
has received from, or there has been published by, the Internal Revenue Service
a ruling, or (y) since the date 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 the Outstanding
Securities 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.

          (5)  In the case of an election under Section 1203, the Company shall
have delivered to the Trustee an Opinion of Counsel to the effect that the
Holders of the Outstanding Securities 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.

          (6)  The Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for relating to either the defeasance under Section 1202 or
the covenant defeasance under Section 1203 (as the case may be) have been
complied with.

          (7)  The Company shall have delivered to the Trustee an Opinion of
Counsel acceptable to the Trustee to the effect that such defeasance will not
result in the trust relating thereto or the Trustee being subject to regulation
under the Investment Company Act of 1940.
<PAGE>

                                                                             142

          SECTION 1205.  Deposited Money and Government Securities to Be Held in
                         -------------------------------------------------------
                         Trust; Other Miscellaneous Provisions.
                         --------------------------------------

          Subject to the provisions of the last paragraph of Section 1003, all
money and Government Securities (including the proceeds thereof) deposited with
the Trustee (or other qualifying trustee, collectively for purposes of this
Section 1205, the "Trustee") pursuant to Section 1204 in respect of the
Outstanding Securities shall be held in trust and applied by the Trustee, in
accordance with the provisions of such Securities and this Indenture, to the
payment, either directly or through any Paying Agent (including the Company
acting as its own Paying Agent) as the Trustee may determine, to the Holders of
such Securities of all sums due and to become due thereon in respect of Accreted
Value, premium, if any, and interest, but such money need not be segregated from
other funds except to the extent required by law or to the extent the Company
acts as its own Paying Agent.

          The Company shall pay and indemnify the Trustee and (if applicable)
its officers, directors, employees and agents against any tax, fee or other
charge imposed on or assessed against the Government Securities deposited
pursuant to Section 1204 or the principal and interest received in respect
thereof other than any such tax, fee or other charge which by law is for the
account of the Holders of the Outstanding Securities.

          Anything in this Article Twelve to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon Company
Request any money or Government Securities held by it as provided in Section
1204 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 an equivalent defeasance or covenant defeasance, as
applicable, in accordance with this Article Twelve.

          SECTION 1206.  Reinstatement.
                         --------------
<PAGE>

                                                                             143

          If the Trustee or any Paying Agent is unable to apply any money in
accordance with Section 401 or 1205 by reason of any order or judgment of any
court or governmental authority enjoining, restraining or otherwise prohibiting
such application, then the Company's and any Guarantor's obligations under this
Indenture and the Securities shall be revived and reinstated as though no
deposit had occurred pursuant to Section 401, 1202 or 1203, as the case may be,
until such time as the Trustee or Paying Agent is permitted to apply all such
money in accordance therewith; provided, however, that if the Company or any
                               --------  -------
Guarantor makes any payment of Accreted Value of, premium, if any, or interest
on any Security following the reinstatement of its obligations, the Company or
such Guarantor shall be subrogated to the rights of the Holders of such
Securities to receive such payment from the money held by the Trustee or Paying
Agent.
<PAGE>

                                                                             144

          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.

                                    LEVEL 3 COMMUNICATIONS, INC.

                                         By:

                                              /s/ Thomas C. Stortz
                                              __________________________
                                              Name:  Thomas C. Stortz
                                              Title: Group Vice President,
                                                     General Counsel and
                                                     Secretary

Attest:

          /s/ Neil J. Eckstein
          __________________________
          Name:  Neil J. Eckstein
          Title: Assistant Secretary

                                    THE BANK OF NEW YORK,
                                    as Trustee

                                         By:

                                              /s/ Van K. Brown
                                              __________________________
                                              Name:  Van K. Brown
                                              Title: Assistant Vice President

Attest:

          /s/ Remo J. Reale
          __________________________
          Name:  Remo J. Reale
          Title: Vice President

<PAGE>

                                   EXHIBIT A

                           Form of Face of Security
                           ------------------------

          [If a Global Security, then insert:] 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 OF A DEPOSITORY OR A
SUCCESSOR DEPOSITORY. THIS SECURITY IS NOT EXCHANGEABLE FOR SECURITIES
REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE
EXCEPT IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND NO TRANSFER
OF THIS SECURITY (OTHER THAN A TRANSFER OF THIS SECURITY AS A WHOLE BY THE
DEPOSITORY TO A NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO
THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY) MAY BE REGISTERED EXCEPT IN
THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE.

          [If a Global Security, then insert:] UNLESS THIS CERTIFICATE IS
PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW
YORK CORPORATION ("DTC"), TO THE COMPANY 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.

                          [Private Placement Legend]

          THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
1933, AS AMENDED (THE "SECURITIES ACT"). THE HOLDER HEREOF, BY PURCHASING THIS
SECURITY, AGREES FOR THE BENEFIT OF THE COMPANY THAT THIS SECURITY MAY NOT BE
RESOLD, PLEDGED OR OTHERWISE TRANSFERRED (X) PRIOR TO THE SECOND ANNIVERSARY OF
THE ISSUANCE HEREOF (OR A PREDECESSOR SECURITY HERETO) OR (Y) BY ANY HOLDER THAT
WAS AN AFFILIATE OF THE COMPANY AT ANY TIME DURING THE THREE MONTHS PRECEDING
THE DATE OF SUCH TRANSFER, IN EITHER CASE OTHER THAN (1) TO THE COMPANY, (2) SO
LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE
SECURITIES ACT
<PAGE>

                                      A-2

("RULE 144A"), TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED
INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A PURCHASING FOR ITS OWN
ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS
GIVEN THAT THE RESALE, PLEDGE OR OTHER TRANSFER IS BEING MADE IN RELIANCE ON
RULE 144A (AS INDICATED BY THE BOX CHECKED BY THE TRANSFEROR ON THE CERTIFICATE
OF TRANSFER ON THE REVERSE OF THIS SECURITY), (3) IN AN OFFSHORE TRANSACTION IN
ACCORDANCE WITH REGULATION S UNDER THE SECURITIES ACT (AS INDICATED BY THE BOX
CHECKED BY THE TRANSFEROR ON THE CERTIFICATE OF TRANSFER ON THE REVERSE OF THIS
SECURITY), PROVIDED THAT, IF SUCH TRANSFER IS BEING EFFECTED BY CERTAIN
TRANSFERORS SPECIFIED IN THE INDENTURE (AS DEFINED BELOW) PRIOR TO THE DATE THAT
IS 40 DAYS FOLLOWING THE ISSUE DATE, A CERTIFICATE THE FORM OF WHICH MAY BE
OBTAINED FROM THE COMPANY OR THE TRUSTEE IS DELIVERED BY THE TRANSFEREE TO THE
COMPANY AND THE TRUSTEE, (4) TO AN INSTITUTION THAT IS AN "ACCREDITED INVESTOR"
AS DEFINED IN RULE 501(a)(1), (2), (3) OR (7) UNDER THE SECURITIES ACT (AS
INDICATED BY THE BOX CHECKED BY THE TRANSFEROR ON THE CERTIFICATE OF TRANSFER ON
THE REVERSE OF THIS SECURITY) THAT IS ACQUIRING THIS SECURITY FOR INVESTMENT
PURPOSES AND NOT FOR DISTRIBUTION, AND A CERTIFICATE THE FORM OF WHICH MAY BE
OBTAINED FROM THE COMPANY OR THE TRUSTEE IS DELIVERED BY THE TRANSFEREE TO THE
COMPANY AND THE TRUSTEE (PROVIDED THAT CERTAIN TRANSFERORS SPECIFIED IN THE
INDENTURE MAY NOT TRANSFER THIS SECURITY PURSUANT TO THIS CLAUSE (4) PRIOR TO
THE DATE THAT IS 40 DAYS FOLLOWING THE ISSUE DATE), (5) PURSUANT TO AN EXEMPTION
FROM REGISTRATION UNDER THE SECURITIES ACT PROVIDED BY RULE 144 (IF APPLICABLE)
UNDER THE SECURITIES ACT, OR (6) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT
UNDER THE SECURITIES ACT, IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE
SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. AN INSTITUTIONAL ACCREDITED
INVESTOR HOLDING THIS SECURITY AGREES IT WILL FURNISH TO THE COMPANY AND THE
TRUSTEE SUCH CERTIFICATES AND OTHER INFORMATION AS THEY MAY REASONABLY REQUIRE
TO CONFIRM THAT ANY TRANSFER BY IT OF THIS SECURITY COMPLIES WITH THE FOREGOING
RESTRICTIONS. THE HOLDER HEREOF, BY PURCHASING THIS SECURITY, REPRESENTS AND
AGREES FOR THE BENEFIT OF THE COMPANY THAT IT IS (1) A QUALIFIED INSTITUTIONAL
BUYER WITHIN THE MEANING OF RULE 144A OR (2) AN INSTITUTION THAT IS AN
"ACCREDITED INVESTOR" AS DEFINED IN RULE 501(a)(1), (2), (3) OR (7) UNDER THE
SECURITIES ACT AND THAT IT IS HOLDING THIS SECURITY FOR INVESTMENT PURPOSES AND
NOT FOR
<PAGE>

                                      A-3

DISTRIBUTION OR (3) A NON-U.S. PERSON OUTSIDE THE UNITED STATES WITHIN THE
MEANING OF (OR AN ACCOUNT SATISFYING THE REQUIREMENTS OF PARAGRAPH (o)(2) OF
RULE 902 UNDER) REGULATION S UNDER THE SECURITIES ACT.

[If a Physical Security, then insert:] IN CONNECTION WITH ANY TRANSFER, THE
HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND
OTHER INFORMATION AS SUCH TRANSFER AGENT MAY REASONABLY REQUIRE TO CONFIRM THAT
THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.
<PAGE>

                                      A-4

                         LEVEL 3 COMMUNICATIONS, INC.

                     12 7/8% Senior Discount Note Due 2010
                                                         CUSIP No.
No.               [if a Global security, insert: up to] $

          Level 3 Communications, Inc., a Delaware corporation (herein called
the "Company", which term includes any successor Person under the Indenture
hereinafter referred to), for value received, hereby promises to pay to
___________' or registered assigns, the principal sum of [if a Global Security,
then insert: up to]___________ Dollars [if a Global Security, then insert: (the
outstanding principal amount at maturity of which shall be reflected in the
attached Schedule of Increases or Decreases in Global Security and the records
of the Trustee which, taken together with the outstanding principal amounts at
maturity of all other Outstanding Securities, shall not exceed $675,000,000 in
the aggregate at any time)] on March 15, 2010, at the office or agency of the
Company referred to below, and to pay interest thereon, in cash in arrears
semiannually on March 15 and September 15 in each year, with payment commencing
on September 15, 2005 and cash interest accruing from March 15, 2005, or from
the most recent Interest Payment Date to which interest has been paid or duly
provided for, at the rate of 12 7/8% per annum, until the principal amount at
maturity hereof is paid or duly provided for; provided that no cash interest
                                              --------
shall accrue on the Accreted Value of this Security prior to March 15, 2005, and
no cash interest shall be paid on this Security prior to September 15, 2005,
except [delete text in brackets if an Exchange Security (other than a Private
Exchange Security): (a) as provided in the next paragraph and (b)] that the
Company may elect, upon not less than 60 days prior notice given in the manner
provided for in the Indenture, to commence the accrual of cash interest (at the
rate shown above) on all Outstanding Securities on or after March 15, 2003, in
which case the outstanding principal amount at maturity of this Security shall
on such commencement date be reduced to the Accreted Value of this Security as
of such commencement date and cash interest shall be payable with respect to
this Security on each March 15 and September 15 thereafter. The Company shall
pay interest on overdue Accreted Value at the rate borne by the Securities, and
it
<PAGE>

                                      A-5

shall pay interest on overdue installments of interest at the same rate to the
extent lawful.

[Delete this paragraph if an Exchange Security (other than a Private Exchange
Security).] The Holder of this Security is entitled to the benefits of a U.S.
Registration Agreement, dated as of February 24, 2000, between the Company and
the Purchasers named therein (the "Registration Agreement"). Capitalized terms
used in this paragraph but not defined herein have the meanings assigned to them
in the Registration Agreement. In the event that (i) neither the Exchange Offer
Registration Statement nor the Shelf Registration Statement has been filed with
the Commission on or prior to the 90th day following the date of the original
issuance of the Securities, (ii) neither the Exchange Offer Registration
Statement nor the Shelf Registration Statement has been declared effective on or
prior to the 150th day following the date of the original issuance of the
Securities, (iii) neither the Registered Exchange Offer has been consummated nor
the Shelf Registration Statement has been declared effective on or prior to the
180th day following the date of the original issuance of the Securities, or (iv)
after the Shelf Registration Statement has been declared effective, such
Registration Statement thereafter ceases to be effective or usable in connection
with resales of the Securities at any time that the Company is obligated to
maintain the effectiveness thereof pursuant to the Registration Agreement (each
such event referred to in clauses (i) through (iv) above being referred to
herein as a "Registration Default"), interest (the "Special Interest") shall
accrue (in addition to stated interest, if any, on the Securities) from and
including the date on which the first such Registration Default shall occur to
but excluding the date on which all Registration Defaults have been cured, at a
rate per annum equal to 0.50% of the Accreted Value of the Securities; provided,
                                                                       --------
however, that such rate per annum shall increase by 0.25% per annum from and
-------
including the 91st day after the first such Registration Default (and each
successive 91st day thereafter) unless and until all Registration Defaults have
been cured; provided further, however, that in no event shall the Special
            -------- -------  -------
Interest accrue at a rate in excess of 1.00% per annum. Accrued Special
Interest, if any, shall be paid in cash in arrears semiannually on March 15 and
September 15 in each year; and the amount of accrued Special Interest shall be
<PAGE>

                                      A-6

determined on the basis of the number of days actually elapsed and the Accreted
Value for each such day. Any accrued and unpaid interest (including Special
Interest) on this Security upon the issuance of an Exchange Security in exchange
for this Security shall cease to be payable to the Holder hereof but such
accrued and unpaid interest (including Special Interest) shall be payable on the
next Interest Payment Date for such Exchange Security to the Holder thereof on
the related Regular Record Date.

          The interest so payable, and punctually paid or duly provided for, on
any Interest Payment Date will, as provided in such Indenture, be paid to the
Person in whose name this Security (or one or more Predecessor Securities) is
registered at the close of business on the Regular Record Date for such
interest, which shall be the March 1 or September 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 such defaulted interest,
and (to the extent lawful) interest on such defaulted interest at the rate borne
by the Securities, may 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 not less
than 10 days prior to such Special Record Date, or may be paid at any time in
any other lawful manner, all as more fully provided in said Indenture. Payment
of the Accreted Value of (and premium, if any) and interest on this Security
will be made at the office or agency of the Company maintained for that purpose
in The City of New York, or at such other office or agency of the Company as may
be maintained for such purpose, in such coin or currency of the United States of
America as at the time of payment is legal tender for payment of public and
private debts; provided, however, that payment of interest may be made at the
               --------  -------
option of the Company by check mailed to the address of the Person entitled
thereto as such address shall appear on the Security Register.

          Reference is hereby made to the further provisions of this Security
set forth on the reverse hereof, which further
<PAGE>

                                      A-7

provisions shall for all purposes have the same effect as if set forth at this
place.

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

                                      A-8

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

Dated:_______________                        LEVEL 3 COMMUNICATIONS, INC.

                                             By:

                                                  _________________________
                                                     Authorized Signatory

Attest:

        __________________
<PAGE>

                                      A-9

                          Form of Reverse of Security
                          ---------------------------

     This Security is one of a duly authorized issue of securities of the
Company designated as its 12 7/8% Senior Discount Notes Due 2010 (herein called
the "Securities"), limited (except as otherwise provided in the Indenture
referred to below) in aggregate principal amount at maturity to $675,000,000,
which may be issued under an indenture (herein called the "Indenture") dated as
of February 29, 2000 between the Company and The Bank of New York, as trustee
(herein called the "Trustee", which term includes any successor trustee under
the Indenture), to which Indenture and all indentures supplemental thereto
reference is hereby made for a statement of the respective rights, limitations
of rights, duties, obligations 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.

     The Securities are subject to redemption at the option of the Company, in
whole or in part, at any time or from time to time on or after March 15, 2005,
upon not less than 30 nor more than 60 days' prior notice, at the redemption
prices (expressed as percentages of Accreted Value) set forth below, plus
accrued and unpaid interest thereon (if any) to the redemption date (subject to
the right of Holders of record on the relevant record date to receive interest
due on the relevant interest payment date), if redeemed during the twelve months
beginning March 15 of the years indicated below:

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

     2005............................................................. 106.438%
     2006............................................................. 104.292%
     2007............................................................. 102.146%
     2008 and thereafter.............................................. 100.000%

     In addition, at any time or from time to time prior to March 15, 2003, the
Company may redeem up to 35% of the original aggregate principal amount at
maturity of the
<PAGE>

                                     A-10

Securities at a redemption price equal to 112.875% of the Accreted Value of the
Securities so redeemed, plus accrued and unpaid interest thereon (if any) to the
redemption date (subject to the right of Holders of record on the relevant
record date to receive interest due on the relevant interest payment date), with
the net cash proceeds of one or more private placements to Persons other than
Affiliates of the Company or underwritten public offerings of Common Stock of
the Company resulting in gross proceeds of at least $100,000,000 in the
aggregate; provided that at least 65% of the original aggregate principal amount
           --------
at maturity of the Securities would remain outstanding immediately after giving
effect to any such redemption. Any such redemption shall be made within 90 days
of any such private placement or public offering upon not less than 30 nor more
than 60 days' prior notice.

     Upon the occurrence of a Change of Control Triggering Event, the Holder of
this Security may require the Company, subject to certain limitations provided
in the Indenture, to repurchase this Security at a purchase price in cash in an
amount equal to 101% of the Accreted Value thereof, plus accrued and unpaid
interest (if any) to the purchase date (subject to the right of Holders of
record on the relevant record date to receive interest due on the relevant
interest payment date).

     In the case of any redemption of Securities, interest installments whose
Stated Maturity is on or prior to the Redemption Date will be payable to the
Holders of such Securities, or one or more Predecessor Securities, of record at
the close of business on the relevant Record Date referred to on the face
hereof.  Securities (or portions thereof) for whose redemption and payment
provision is made in accordance with the Indenture shall cease to bear interest
or accrete principal, as the case may be, from and after the Redemption Date.

     In the event of redemption of this Security in part only, a new Security or
Securities for the unredeemed portion hereof shall be issued in the name of the
Holder hereof upon the cancellation hereof.

     To guarantee the due and punctual payment of the Accreted Value, premium
(if any) and interest on the
<PAGE>

                                     A-11

Securities and all other amounts payable by the Company under the Indenture and
the Securities when and as the same shall be due and payable, whether at
maturity, by acceleration or otherwise, according to the terms of the Securities
and the Indenture, the Guarantors, if any, will unconditionally guarantee such
obligations on a senior unsecured basis pursuant to the terms of the Indenture.

     If an Event of Default shall occur and be continuing, the Accreted Value of
all the Securities may be declared due and payable in the manner and with the
effect provided in the Indenture.

     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 Defaults and Events of Default, upon compliance by the Company
with certain conditions set forth therein, which provisions apply to this
Security.

     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 under the Indenture at any time by the
Company and the Trustee with the consent of the Holders of a majority in
aggregate principal amount at maturity of the Securities at the time
Outstanding.  The Indenture also contains provisions permitting the Holders of
specified percentages in aggregate principal amount at maturity of the
Securities at the time Outstanding, on behalf of the Holders of all the
Securities, to waive compliance by the Company with certain provisions of the
Indenture and certain past defaults under the Indenture and their consequences.
Without the consent of any Holder of Securities, the Company and the Trustee may
amend or modify the Indenture for certain purposes specified therein, including
the release of Guarantors, if any, from Restricted Subsidiary Guarantees as
provided by the terms of the Indenture.  Any such consent or waiver by or on
behalf of the Holder of this Security shall be conclusive and binding upon such
Holder and upon all future Holders of this Security and of any Security issued
upon the registration of transfer hereof or in exchange herefor or in lieu
hereof whether or not notation of such consent or waiver is made upon this
Security.
<PAGE>

                                     A-12

     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 Accreted Value of (and premium, if any)
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 registerable on the Security Register of
the Company, upon surrender of this Security for registration of transfer at the
office or agency of the Company maintained for such purpose in The City of New
York, 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 thereupon one
or more new Securities, of authorized denominations and for the same aggregate
principal amount at maturity, will be issued to the designated transferee or
transferees.  The Securities are issuable only in registered form without
coupons in denominations of $1,000 principal amount at maturity and any integral
multiple thereof.  As provided in the Indenture and subject to certain
limitations therein set forth, the Securities are exchangeable for a like
aggregate Accreted Value of Securities of a different authorized denomination,
as requested by the Holder surrendering the same.

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

     Prior to the time of 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 agent shall be affected by notice to the
contrary.
<PAGE>

                                     A-13

     THIS SECURITY SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW
OF THE STATE OF NEW YORK BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF
CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER
JURISDICTION WOULD BE REQUIRED THEREBY.

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

                                     A-14

                Form of Trustee's Certificate of Authentication
                -----------------------------------------------

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

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

     Dated:  __________________

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

                                   THE BANK OF NEW YORK, as Trustee

                                   By:

                                        ________________________________
                                         Authorized Signatory
<PAGE>

                                     A-15

                                Assignment Form
                                ---------------

     If you, the holder, want to assign this Security, fill in the form below
and have your signature guaranteed:

I or we assign and transfer this Security to________________

________________________________________________________________________________

(Insert assignee's social security or tax ID number)

                                                                 _______________

(Print or type assignee's name, address and zip code)

                                                                 _______________

                                                                 _______________

                                                                 _______________

and irrevocably appoint_______________________

of  _______________________________

    _______________________________

agent to transfer this Security on the books of the Company.  The agent may
substitute another to act for such agent.
<PAGE>

                                     A-16

     In connection with any transfer of any of the Securities evidenced by this
certificate occurring prior to the date that is two years (or such shorter
period as may be prescribed by Rule 144(k) under the Securities Act or any
successor provision thereunder) after the later of the date of original issuance
of such Securities (or any Predecessor Security) or three months after the last
date, if any, on which such Securities (or any Predecessor Security) were owned
by the Company or any Affiliate of the Company, the undersigned confirms that
such Securities are being transferred in accordance with its terms:

CHECK ONE BOX BELOW

     (1)  [_]  to the Company; or

     (2)  [_]  pursuant to an effective registration statement under the
               Securities Act of 1933; or

     (3)  [_]  inside the United States to a "qualified institutional buyer" (as
               defined in Rule 144A under the Securities Act of 1933) that
               purchases for its own account or for the account of a qualified
               institutional buyer to whom notice is given that such transfer is
               being made in reliance on Rule 144A, in each case pursuant to and
               in compliance with Rule 144A under the Securities Act of 1933; or

     (4)  [_]  outside the United States in an offshore transaction within the
               meaning of Regulation S under the Securities Act in compliance
               with Rule 904 under the Securities Act of 1933, provided that, if
                                                               --------
               such transfer is being effected by certain transferors specified
               in the Indenture prior to the date that is 40 days following the
               Issue Date, a certificate which may be obtained from the Company
               or the Trustee is delivered by the transferee to the Company and
               the Trustee; or
<PAGE>

                                     A-17

     (5)  [_]  to an institutional "accredited investor" (as defined in Rule
               501(a)(1), (2), (3) or (7) under the Securities Act of 1933) that
               has furnished to the Trustee a signed letter containing certain
               representations and agreements (the form of which letter can be
               obtained from the Trustee or the Company), provided that certain
                                                          --------
               transferors specified in the Indenture may not transfer this
               Security pursuant to this clause (5) prior to the date that is 40
               days following the Issue Date; or

     (6)  [_]  pursuant to another available exemption from registration
               provided by Rule 144 under the Securities Act of 1933.

Unless one of the boxes is checked, the Trustee will refuse to register any of
the Securities evidenced by this certificate in the name of any person other
than the registered holder thereof; provided, however, that if box (4), (5) or
                                    --------  -------
(6) is checked, the Trustee may require, prior to registering any such transfer
of the Securities, such legal opinions, certifications and other information as
the Company has reasonably requested to confirm that such transfer is being made
pursuant to an exemption from, or in a transaction not subject to, the
registration requirements of the Securities Act of 1933.

Dated:  _______________            Your signature:  __________________
                                                      (Sign exactly
                                   as your name appears on the other
                                   side of this Security)

                                   By:

                                   ___________________________________
                                   NOTICE: To be executed by an
                                   executive officer

Signature Guarantee:  ____________________________________

     TO BE COMPLETED BY PURCHASER IF (3) ABOVE IS CHECKED:
<PAGE>

                                     A-18

     The undersigned represents and warrants that it is purchasing this Security
for its own account or an account with respect to which it exercises sole
investment discretion and that it and any such account is a "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act of
1933 and is aware that the sale to it is being made in reliance on Rule 144A and
acknowledges that it has received such information regarding the Company as the
undersigned has requested pursuant to Rule 144A (including the information
specified in Rule 144A(d)(4)) or has determined not to request such information
and that it is aware that the transferor is relying upon the undersigned's
foregoing representations in order to claim the exemption from registration
provided by Rule 144A.

Dated: _____________________            ____________________________
                                        NOTICE: To be executed by an
                                                executive officer
<PAGE>

                                     A-19

                      Option of Holder to Elect Purchase
                      ----------------------------------

     If you wish to have this Security purchased by the Company pursuant to
Section 1009 or 1016 of the Indenture, check the box:  [_]

     If you wish to have a portion of this Security purchased by the Company
pursuant to Section 1009 or 1016 of the Indenture, state the amount:
$___________________.

Dated: ________________                 Your Signature:  _________________
                                        (Sign exactly as your name appears on
                                        the other side of this Security)
<PAGE>

                                     A-20

                     [TO BE ATTACHED TO GLOBAL SECURITIES]

             SCHEDULE OF INCREASES OR DECREASES IN GLOBAL SECURITY

                  The initial principal amount at maturity of this Global
Security is $[          ]. The following increases or decreases in this Global
Security have been made:

<TABLE>
<CAPTION>
Date of                  Amount of decrease     Amount of increase     Principal amount at    Signature of
Transfer                 in Principal  Amount   in Principal Amount    Maturity of this       authorized signatory
                         at Maturity of this    at Maturity of this    Global Security        of Trustee or
                         Global Security        Global Security        following such         Security Registrar
                                                                       decrease or increase
<S>                      <C>                    <C>                    <C>                    <C>
</TABLE>
<PAGE>

                                   EXHIBIT B

                        FORM OF SUPPLEMENTAL INDENTURE

          SUPPLEMENTAL INDENTURE (this "Supplemental Indenture") dated as
of        , among [GUARANTOR] (the "New Guarantor"), a subsidiary of Level 3
Communications, Inc. (or its successor), a Delaware corporation (the "Company"),
LEVEL 3 COMMUNICATIONS, INC., on behalf of itself and the Guarantors (the
"Existing Guarantors"), if any, under the Indenture referred to below, and THE
BANK OF NEW YORK, a New York banking corporation, as trustee under the indenture
referred to below (the "Trustee").

                             W I T N E S S E T H :

          WHEREAS the Company has heretofore executed and delivered to the
Trustee an Indenture dated as of February 29, 2000 (the "Indenture"; capitalized
terms used but not defined herein having the meanings assigned thereto in the
Indenture), providing for the issuance of an aggregate principal amount at
maturity of up to $675,000,000 of 12-7/8% Senior Discount Notes Due 2010 (the
"Securities");

          WHEREAS the Indenture permits the New Guarantor to execute and deliver
to the Trustee a supplemental indenture pursuant to which the New Guarantor
shall unconditionally guarantee all the Company's obligations under the
Securities pursuant to a Guarantee on the terms and conditions set forth herein;

          WHEREAS the Guarantee contained in this Supplemental Indenture shall
constitute a "Restricted Subsidiary Guarantee", and the New Guarantor shall
constitute a "Guarantor", for all purposes of the Indenture; and

          WHEREAS pursuant to Section 901 of the Indenture, the Trustee and the
Company are authorized to execute and deliver this Supplemental Indenture;
<PAGE>

                                      B-2

          NOW THEREFORE, in consideration of the foregoing and for other
good and valuable consideration, the receipt of which is hereby acknowledged,
the New Guarantor, the Company, the Existing Guarantors and the Trustee mutually
covenant and agree for the equal and ratable benefit of the holders of the
Securities as follows:

          1.   Guaranties. The New Guarantor hereby unconditionally
               -----------
guarantees, jointly and severally, to each Holder and to the Trustee and its
successors and assigns (a) the full and punctual payment of Accreted Value of
(and premium, if any) and interest on the Securities when due, whether at Stated
Maturity, by acceleration, by redemption or otherwise, and all other monetary
obligations of the Company under the Indenture and the Securities and (b) the
full and punctual performance within applicable grace periods of all other
obligations of the Company under the Indenture and the Securities (all the
foregoing being hereinafter collectively called the "Obligations"). The New
Guarantor further agrees that the Obligations may be extended or renewed, in
whole or in part, without notice or further assent from the New Guarantor and
that the New Guarantor will remain bound under this Supplemental Indenture
notwithstanding any extension or renewal of any Obligation.

          The New Guarantor waives presentation to, demand of, payment
from and protest to the Company of any of the Obligations and also waives notice
of protest for nonpayment. The New Guarantor waives notice of any default under
the Securities or the Obligations. The obligations of the New Guarantor
hereunder shall not be affected by (a) the failure of any Holder or the Trustee
to assert any claim or demand or to enforce any right or remedy against the
Company or any other Person under the Indenture, the Securities or any other
agreement or otherwise; (b) any extension or renewal of any thereof; (c) any
rescission, waiver, amendment or modification of any of the terms or provisions
of the Indenture, the Securities or any other agreement; (d) the release of any
security held by any Holder or the Trustee for the Obligations or any of them;
(e) the failure of any Holder or the Trustee to exercise any right or remedy
against any other guarantor of the Obligations; or (f) any change in the
ownership of the New Guarantor.
<PAGE>

                                      B-3

          The New Guarantor further agrees that its Guarantee herein
constitutes a guarantee of payment, performance and compliance when due (and not
a guarantee of collection) and waives any right to require that any resort be
had by any Holder or the Trustee to any security held for payment of the
Obligations.

          Except as expressly set forth in Sections 803, 1017, 1020,
1202 and 1203 of the Indenture, the obligations of the New Guarantor hereunder
shall not be subject to any reduction, limitation, impairment or termination for
any reason, including any claim of waiver, release, surrender, alteration or
compromise, and shall not be subject to any defense of setoff, counterclaim,
recoupment or termination whatsoever or by reason of the invalidity, illegality
or unenforceability of the Obligations or otherwise. Without limiting the
generality of the foregoing, the obligations of the New Guarantor herein shall
not be discharged or impaired or otherwise affected by the failure of any Holder
or the Trustee to assert any claim or demand or to enforce any remedy under the
Indenture, the Securities or any other agreement, by any waiver or modification
of any thereof, by any default, failure or delay, willful or otherwise, in the
performance of the obligations, or by any other act or thing or omission or
delay to do any other act or thing which may or might in any manner or to any
extent vary the risk of the New Guarantor or would otherwise operate as a
discharge of the New Guarantor as a matter of law or equity.

          The New Guarantor further agrees that its Guarantee herein
shall continue to be effective or be reinstated, as the case may be, if at any
time payment, or any part thereof, of Accreted Value of (or premium, if any) or
interest on any Obligation is rescinded or must otherwise be restored by any
Holder or the Trustee upon the bankruptcy or reorganization of the Company or
otherwise.

          In furtherance of the foregoing and not in limitation of any
other right which any Holder or the Trustee has at law or in equity against the
New Guarantor by virtue hereof, upon the failure of the Company to pay the
Accreted Value of (or premium, if any) or interest on any Obligation when and as
the same shall become due, whether at Stated Maturity, by acceleration, by
redemption or otherwise, or to perform or comply with any other Obligation, the
New Guarantor hereby promises to and will, upon receipt of written demand by the
Trustee, forthwith pay, or
<PAGE>

                                      B-4

cause to be paid, in cash, to the Holders or the Trustee an amount equal to the
sum of (i) the unpaid amount of such Obligations, (ii) accrued and unpaid
interest on such Obligations (but only to the extent not prohibited by law) and
(iii) all other monetary Obligations of the Company to the Holders and the
Trustee.

          The New Guarantor agrees that it shall not be entitled to any
right of subrogation in respect of any Obligations guaranteed hereby until
payment in full in cash of all Obligations. The New Guarantor further agrees
that, as between it, on the one hand, and the Holders and the Trustee, on the
other hand, (x) the maturity of the Obligations guaranteed hereby may be
accelerated as provided in Article Five of the Indenture for the purposes of the
New Guarantor's Guarantee herein, notwithstanding any stay, injunction or other
prohibition preventing such acceleration in respect of the Obligations
guaranteed hereby, and (y) in the event of any declaration of acceleration of
such obligations as provided in Article Five of the Indenture, such Obligations
(whether or not due and payable) shall forthwith become due and payable by the
New Guarantor for the purposes of this Section.

          The New Guarantor also agrees to pay any and all costs and
expenses (including reasonable attorneys' fees) incurred by the Trustee or any
Holder in enforcing any rights under this Section 1.

          2.   Contribution.  Each of the Company and the New Guarantor (a
               -------------
"Contributing Party") agrees that, in the event a payment shall be made by any
other Guarantor under any Restricted Subsidiary Guarantee (the "Claiming
Guarantor"), the Contributing Party shall indemnify the Claiming Guarantor in an
amount equal to the amount of such payment multiplied by a fraction, the
numerator of which shall be the net worth of the Contributing Party (which, in
the case of the Company, shall be measured on the Issue Date, and in the case of
the New Guarantor, on the date hereof) and the denominator of which shall be the
aggregate net worth of the Company on the Issue Date and the Guarantors on
respective dates of the Supplemental Indentures executed and delivered by such
Guarantors.

          3.   Successors and Assigns. This Supplemental Indenture shall
               -----------------------
be binding upon the New Guarantor and its successors and assigns and shall enure
to the benefit of the
<PAGE>

                                      B-5

successors and assigns of the Trustee and the Holders and, in the event of any
transfer or assignment of rights by any Holder or the Trustee, the rights and
privileges conferred upon that party in the Indenture and in the Securities
shall automatically extend to and be vested in such transferee or assignee, all
subject to the terms and conditions of this Indenture.

          4.   No Waiver.  Neither a failure nor a delay on the part of
               ----------
either the Trustee or the Holders in exercising any right, power or privilege
under this Supplemental Indenture, the Indenture or the Securities shall operate
as a waiver thereof, nor shall a single or partial exercise thereof preclude any
other or further exercise of any right, power or privilege. The rights, remedies
and benefits of the Trustee and the Holders herein and therein expressly
specified are cumulative and not exclusive of any other rights, remedies or
benefits which either may have under this Supplemental Indenture, the Indenture
or the Securities at law, in equity, by statute or otherwise.

          5.   Modification.  No modification, amendment or waiver of any
               -------------
provision of this Supplemental Indenture, nor the consent to any departure by
the New Guarantor therefrom, shall in any event be effective unless the same
shall be in writing and signed by the Trustee, and then such waiver or consent
shall be effective only in the specific instance and for the purpose for which
given. No notice to or demand on the New Guarantor in any case shall entitle the
New Guarantor to any other or further notice or demand in the same, similar or
other circumstances.

          6.   Opinion of Counsel.  Concurrently with the execution and
               -------------------
delivery of this Supplemental Indenture, the Company shall deliver to the
Trustee an Opinion of Counsel to the effect that this Supplemental Indenture has
been duly authorized, executed and delivered by each of the New Guarantor and
the Company and that, subject to the application of bankruptcy, insolvency,
moratorium, fraudulent conveyance or transfer and other similar laws relating to
creditors' rights generally and to the principles of equity, whether considered
in a proceeding at law or in equity, the Guarantee of the New Guarantor is a
legal, valid and binding obligation of the New Guarantor, enforceable against
the New Guarantor in accordance with its terms.

          7.   Ratification of Indenture; Supplemental Indentures Part of
               ----------------------------------------------------------
Indenture. Except as expressly amended hereby, the
----------
<PAGE>

                                      B-6

Indenture is in all respects ratified and confirmed and all the terms,
conditions and provisions thereof shall remain in full force and effect. This
Supplemental Indenture shall form a part of the Indenture for all purposes, and
every holder of Securities heretofore or hereafter authenticated and delivered
shall be bound hereby.

          8.   Governing Law.  THIS SUPPLEMENTAL INDENTURE SHALL BE
               --------------
GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK
BUT WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE
EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE
REQUIRED THEREBY.

          9.   Counterparts.  The parties may sign any number of copies of this
               -------------
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

          10.  Effect of Headings. The Section headings herein are for
               -------------------
convenience only and shall not effect the construction thereof.

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

                                        [NEW GUARANTOR],

                                          by
                                             _____________________________
                                             Name:
                                             Title:

                                        LEVEL 3 COMMUNICATIONS, INC.,
                                        on behalf of itself and the
                                        Existing Guarantors, if any,

                                          by
                                             _____________________________
                                             Name:
                                             Title:
<PAGE>

                                      B-7

                                        THE BANK OF NEW YORK,
                                        as Trustee,

                                          by
                                             _____________________________
                                             Name:
                                             Title:<PAGE>

                                                                  EXECUTION COPY

                                                                     Exhibit 4.4

                         LEVEL 3 COMMUNICATIONS, INC.

                                $1,725,000,000
                           11% Senior Notes due 2008
                         11-1/4% Senior Notes due 2010
                    12-7/8% Senior Discount Notes due 2010

                          U.S. REGISTRATION AGREEMENT

                                                              New York, New York
                                                               February 24, 2000
To:  SALOMON SMITH BARNEY INC.
GOLDMAN, SACHS & CO.
MORGAN STANLEY & CO. INCORPORATED
CHASE SECURITIES INC.
J.P. MORGAN SECURITIES INC.
CREDIT SUISSE FIRST BOSTON CORPORATION
BNY CAPITAL MARKETS, INC.
FIRST UNION SECURITIES, INC.

In care of:

Salomon Smith Barney Inc.
388 Greenwich Street
New York, New York 10013

Ladies and Gentlemen:
<PAGE>

          Level 3 Communications, Inc., a Delaware corporation (the "Company"),
proposes to issue and sell to certain purchasers (the "Purchasers"), upon the
terms set forth in a purchase agreement dated the date hereof (the "Purchase
Agreement"), $800,000,000 aggregate principal amount of its 11% Senior Notes due
2008, $250,000,000 aggregate principal amount of its 11-1/4% Senior Notes due
2010 and $675,000,000 aggregate principal amount at maturity of its 12-7/8%
Senior Discount Notes due 2010 (collectively the "Securities") (the "Initial
Placement"). As an inducement to the Purchasers to enter into the Purchase
Agreement and in satisfaction of a condition to your obligations thereunder, the
Company agrees with you, (i) for your benefit and the benefit of the other
Purchasers and (ii) for the benefit of the holders from time to time of the
Securities (including you and the other Purchasers) (each of the foregoing a
"Holder" and together the "Holders"), as follows:

          1.  Definitions.  Capitalized terms used herein without definition
              ------------
shall have their respective meanings set forth in the Purchase Agreement.  As
used in this Agreement, the following capitalized defined terms shall have the
following meanings:

          "Affiliate" of any specified person means any other person which,
           ---------
directly or indirectly, is in control of, is controlled by, or is under common
control with, such specified person. For purposes of this definition, control of
a person means the power, direct or indirect, to direct or cause the direction
of the management and policies of such person whether by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

          "Exchange Offer Registration Period" means the 180-day period
           ----------------------------------
following the consummation of the Registered Exchange Offer, exclusive of any
period during which any stop order shall be in effect suspending the
effectiveness of the Exchange Offer Registration Statement.

          "Exchange Offer Registration Statement" means a registration statement
           -------------------------------------
of the Company on an appropriate form under the Securities Act with respect to
the Registered Exchange Offer, all amendments and supplements to such
registration statement, including post-effective amendments, in each case
including the Prospectus contained therein, all exhibits thereto and all
material incorporated by reference therein.
<PAGE>

                                                                               3

          "Exchanging Dealer" means any Holder (which may include the
           -----------------
Purchasers) which is a broker-dealer electing to exchange Securities acquired
for its own account as a result of market-making activities or other trading
activities for New Securities.

          "Holder" has the meaning set forth in the preamble hereto.
           ------

          "Indentures" means the Indentures relating to the Securities and the
           ----------
New Securities, each to be dated as of February 29, 2000, between the Company
and The Bank of New York, as trustee, as the same may be amended from time to
time in accordance with the terms thereof.

          "Initial Placement" has the meaning set forth in the preamble hereto.
           -----------------

          "Majority Holders" means the Holders of a majority of the aggregate
           ----------------
principal amount of securities registered under a Registration Statement.

          "Managing Underwriters" means the investment banker or investment
           ---------------------
bankers and manager or managers that shall administer an offering of securities
under a Shelf Registration Statement.

          "New Securities" means debt securities of the Company identical in all
           --------------
material respects to the Securities (except that the interest rate step-up
provisions and the transfer restrictions will be modified or eliminated, as
appropriate), to be issued under the Indentures.

          "Prospectus" means the prospectus included in any Registration
           ----------
Statement (including, without limitation, a prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A under the Securities Act), as
amended or supplemented by any prospectus supplement, with respect to the terms
of the offering of any portion of the Securities or the New Securities, covered
by such Registration Statement, and all amendments and supplements to the
Prospectus, including post-effective amendments.
<PAGE>

                                                                               4

          "Registered Exchange Offer" means the proposed offer to the Holders to
           -------------------------
issue and deliver to such Holders, in exchange for the Securities, a like
principal amount of the New Securities.

          "Registration Securities" has the meaning set forth in Section 3(a)
           -----------------------
hereof.

          "Registration Statement" means any Exchange Offer Registration
           ----------------------
Statement or Shelf Registration Statement that covers any of the Securities or
the New Securities pursuant to the provisions of this Agreement, all amendments
and supplements to such registration statement, including, without limitation,
post-effective amendments, in each case including the Prospectus contained
therein, all exhibits thereto and all material incorporated by reference
therein.

          "Securities" has the meaning set forth in the preamble hereto.
           ----------

          "Shelf Registration" means a registration effected pursuant to Section
           ------------------
3 hereof.

          "Shelf Registration Period" has the meaning set forth in Section 3(b)
           -------------------------
hereof.

          "Shelf Registration Statement" means a "shelf" registration statement
           ----------------------------
of the Company pursuant to the provisions of Section 3 hereof which covers some
of or all the Securities or New Securities, as applicable, on an appropriate
form under Rule 415 under the Securities Act, or any similar rule that may be
adopted by the Commission, all amendments and supplements to such registration
statement, including post-effective amendments, in each case including the
Prospectus contained therein, all exhibits thereto and all material incorporated
by reference therein.

          "Trustee" means the trustee with respect to the Securities and the New
           -------
Securities under the Indentures.

          "underwriter" means any underwriter of securities in connection with
           -----------
an offering thereof under a Shelf Registration Statement.
<PAGE>

                                                                               5

          2.  Registered Exchange Offer; Resales of New Securities by Exchanging
              ------------------------------------------------------------------
Dealers; Private Exchange.
--------------------------

          (a)  The Company shall prepare and, not later than 90 days after the
date of the original issuance of the Securities, shall file with the Commission
the Exchange Offer Registration Statement with respect to the Registered
Exchange Offer.  The Company shall use its best efforts to cause the Exchange
Offer Registration Statement to become effective under the Securities Act within
150 days after the date of the original issuance of the Securities.

          (b)  Upon the effectiveness of the Exchange Offer Registration
Statement, the Company shall promptly commence the Registered Exchange Offer, it
being the objective of such Registered Exchange Offer to enable each Holder
electing to exchange Securities for New Securities (assuming that such
Securities do not constitute a portion of an unsold allotment acquired by such
Holder directly from the Company and such Holder is not an affiliate of the
Company within the meaning of the Securities Act, acquires the New Securities in
the ordinary course of such Holder's business and has no arrangements with any
person to participate in the distribution of the New Securities) to trade such
New Securities from and after their receipt without any limitations or
restrictions under the Securities Act and without material restrictions under
the securities laws of a substantial proportion of the several states of the
United States.

          (c)  In connection with the Registered Exchange Offer, the Company
shall:

          (i)  mail to each Holder a copy of the Prospectus forming part of the
     Exchange Offer Registration Statement, together with an appropriate letter
     of transmittal and related documents;

          (ii) keep the Registered Exchange Offer open for not less than 30 days
     after the date notice thereof is mailed to the Holders (or longer if
     required by applicable law);
<PAGE>

                                                                               6

          (iii) utilize the services of a depositary for the Registered Exchange
     Offer with an address in the Borough of Manhattan, The City of New York;
     and

          (iv)  comply in all material respects with all applicable laws.

          (d)   As soon as practicable after the close of the Registered
Exchange Offer, the Company shall:

          (i)   accept for exchange all Securities tendered and not validly
     withdrawn pursuant to the Registered Exchange Offer;

          (ii)  deliver to the Trustee for cancelation all Securities so
     accepted for exchange; and

          (iii) cause the Trustee promptly to authenticate and deliver to each
     Holder of Securities, New Securities equal in principal amount to the
     Securities of such Holder so accepted for exchange.

          (e)   The Purchasers and the Company acknowledge that, pursuant to
current interpretations by the Commission's staff of Section 5 of the Securities
Act, and in the absence of an applicable exemption therefrom, each Exchanging
Dealer is required to deliver a Prospectus in connection with a sale of any New
Securities received by such Exchanging Dealer pursuant to the Registered
Exchange Offer in exchange for Securities acquired for its own account as a
result of market-making activities or other trading activities.  Accordingly,
the Company shall:
<PAGE>

                                                                               7

          (i)  include the information set forth in Annex A hereto on the cover
     of the Exchange Offer Registration Statement, in Annex B hereto in the
     forepart of the Exchange Offer Registration Statement in a section setting
     forth details of the Exchange Offer, in Annex C hereto in the underwriting
     or plan of distribution section of the Prospectus forming a part of the
     Exchange Offer Registration Statement, and in Annex D hereto in the Letter
     of Transmittal delivered pursuant to the Registered Exchange Offer (it
     being understood that a Holder's participation in the Exchange Offer is
     conditioned on the Holder, by executing and returning the Letter of
     Transmittal, representing in writing to the Company as set forth in Rider B
     of Annex D hereto); and

          (ii) use its best efforts to keep the Exchange Offer Registration
     Statement continuously effective under the Securities Act during the
     Exchange Offer Registration Period for delivery by Exchanging Dealers in
     connection with sales of New Securities received pursuant to the Registered
     Exchange Offer, as contemplated by Section 4(h) below.

          (f)  In the event that any Purchaser determines that it is not
eligible to participate in the Registered Exchange Offer with respect to the
exchange of Securities constituting any portion of an unsold allotment, at the
request of such Purchaser, the Company shall issue and deliver to such Purchaser
or the party purchasing New Securities registered under a Shelf Registration
Statement as contemplated by Section 3 hereof from such Purchaser, in exchange
for such Securities, a like principal amount of New Securities.  The Company
shall seek to cause the CUSIP Service Bureau to issue the same CUSIP number for
such New Securities as for New Securities issued pursuant to the Registered
Exchange Offer.
<PAGE>

                                                                               8

          3.  Shelf Registration.  If, (i) because of any change in law or
              -------------------
applicable interpretations thereof by the Commission's staff, the Company
determines upon advice of its outside counsel that it is not permitted to effect
the Registered Exchange Offer as contemplated by Section 2 hereof, or (ii) for
any other reason the Exchange Offer Registration Statement is not declared
effective within 150 days after the Closing Date or the Registered Exchange
Offer is not consummated within 180 days after the Closing Date, or (iii) any
Purchaser so requests with respect to Securities (or any New Securities received
pursuant to Section 2(f)) not eligible to be exchanged for New Securities in a
Registered Exchange Offer or, in the case of any Purchaser that participates in
any Registered Exchange Offer, such Purchaser does not receive freely tradable
New Securities, or (iv) any Holder (other than a Purchaser) is not eligible to
participate in the Registered Exchange Offer or (v) in the case of any such
Holder that participates in the Registered Exchange Offer, such Holder does not
receive freely tradable New Securities in exchange for tendered securities,
other than by reason of such Holder being an affiliate of the Company within the
meaning of the Securities Act (it being understood that, for purposes of this
Section 3, (x) the requirement that a Purchaser deliver a Prospectus containing
the information required by Items 507 and/or 508 of Regulation S-K under the
Securities Act in connection with sales of New Securities acquired in exchange
for such Securities shall result in such New Securities being not "freely
tradeable" but (y) the requirement that an Exchanging Dealer deliver a
Prospectus in connection with sales of New Securities acquired in the Registered
Exchange Offer in exchange for Securities acquired as a result of market-making
activities or other trading activities shall not result in such New Securities
being not "freely tradeable"), the following provisions shall apply:
<PAGE>

                                                                               9

          (a)  The Company shall as promptly as practicable (but in no event
more than the later of (i) 90 days after the Closing Date or (ii) 45 days after
so required or requested pursuant to this Section 3), file with the Commission
and thereafter shall use its best efforts to cause to be declared effective
under the Securities Act a Shelf Registration Statement relating to the offer
and sale of the Securities or the New Securities, as applicable, by the Holders
from time to time in accordance with the methods of distribution elected by such
Holders and set forth in such Shelf Registration Statement (such Securities or
New Securities, as applicable, to be sold by such Holders under such Shelf
Registration Statement being referred to herein as "Registration Securities");
provided, however, that, with respect to New Securities received by a Purchaser
--------  -------
in exchange for Securities constituting any portion of an unsold allotment, the
Company may, if permitted by current interpretations by the Commission's staff,
file a post-effective amendment to the Exchange Offer Registration Statement
containing the information required by Regulation S-K Items 507 and/or 508, as
applicable, in satisfaction of its obligations under this paragraph (a) with
respect thereto, and any such Exchange Offer Registration Statement, as so
amended, shall be referred to herein as, and governed by the provisions herein
applicable to, a Shelf Registration Statement.

          (b)  The Company shall use its best efforts to keep the Shelf
Registration Statement continuously effective in order to permit the Prospectus
forming part thereof to be usable by Holders for a period of two years from the
date the Shelf Registration Statement is declared effective by the Commission or
such shorter period that will terminate when all the Securities or New
Securities, as applicable, covered by the Shelf Registration Statement have been
sold pursuant to the Shelf Registration Statement (in any such case, such period
being called the "Shelf Registration Period").  The Company shall be deemed not
to have used its best efforts to keep the Shelf Registration Statement effective
during the Shelf Registration Period if it voluntarily takes any action that
would result in Holders of securities covered thereby not being able to offer
and sell such securities during that period, unless (i) such action is required
by applicable law or (ii) such action is taken by the Company in good faith and
for valid business reasons
<PAGE>

                                                                              10

(not including avoidance of the Company's obligation hereunder), including the
acquisition or divestiture of assets, so long as the Company promptly thereafter
complies with the requirements of Section 4(k) hereof, if applicable.

          4.   Registration Procedures.  In connection with any Shelf
               ------------------------
Registration Statement and, to the extent applicable, any Exchange Offer
Registration Statement, the following provisions shall apply:

          (a)  (i)  The Company shall furnish to you, prior to the filing
     thereof with the Commission, a copy of any Exchange Offer Registration
     Statement, each amendment thereof and each amendment or supplement, if any,
     to the Prospectus included therein and shall use its best efforts to
     reflect in each such document, when so filed with the Commission, such
     comments as you reasonably may propose.

          (ii) The Company shall furnish to you, prior to the filing thereof
     with the Commission, a copy of any Shelf Registration Statement, each
     amendment thereof and each amendment or supplement, if any, to the
     Prospectus included therein and shall use its best efforts to reflect in
     each such document, when so filed with the Commission, such comments as any
     Holder whose securities are to be included in such Shelf Registration
     Statement reasonably may propose.

          (b)  The Company shall ensure that (i) any Registration Statement and
     any amendment thereto and any Prospectus forming part thereof and any
     amendment or supplement thereto complies in all material respects with the
     Securities Act and the rules and regulations thereunder, (ii) any
     Registration Statement and any amendment thereto does not, when it becomes
     effective, contain an untrue statement of a material fact or omit to state
     a material fact required to be stated therein or necessary to make the
     statements therein not misleading and (iii) any Prospectus forming part of
     any Registration Statement, and any amendment or supplement to such
     Prospectus, does not include an untrue statement of a material fact or omit
     to state a material fact necessary in order to make the statements
<PAGE>

                                                                              11

     therein, in the light of the circumstances under which they were made, not
     misleading.

          (c)  (1)  The Company shall advise you and, in the case of a Shelf
     Registration Statement, the Holders of securities covered thereby, and, if
     requested by you or any such Holder, confirm such advice in writing:

               (i)   when a Registration Statement and any amendment thereto has
          been filed with the Commission and when the Registration Statement or
          any post-effective amendment thereto has become effective; and

               (ii)  of any request by the Commission for amendments or
          supplements to the Registration Statement or the Prospectus included
          therein or for additional information.

          (2)  The Company shall advise you and, in the case of a Shelf
     Registration Statement, the Holders of securities covered thereby, and, in
     the case of an Exchange Offer Registration Statement, any Exchanging Dealer
     which has provided in writing to the Company a telephone or facsimile
     number and address for notices, and, if requested by you or any such Holder
     or Exchanging Dealer, confirm such advice in writing:

               (i)   of the issuance by the Commission of any stop order
          suspending the effectiveness of the Registration Statement or the
          initiation of any proceedings for that purpose;

               (ii)  of the receipt by the Company of any notification with
          respect to the suspension of the qualification of the securities
          included therein for sale in any jurisdiction or the initiation or
          threatening of any proceeding for such purpose; and

               (iii) of the happening of any event that requires the making of
          any changes in the Registration Statement or the Prospectus so that,
          as of such date, the statements therein are not misleading and do not
          omit to state a material
<PAGE>

                                                                              12

          fact required to be stated therein or necessary to make the statements
          therein (in the case of the Prospectus, in the light of the
          circumstances under which they were made) not misleading (which advice
          shall be accompanied by an instruction to suspend the use of the
          Prospectus until the requisite changes have been made).

     Each such Holder or Exchanging Dealer agrees by its acquisition of such
     securities to be sold by such Holder or Exchanging Dealer, that, upon being
     so advised by the Company of any event described in clause (iii) of this
     paragraph (c)(2), such Holder or Exchanging Dealer will forthwith
     discontinue disposition of such securities under such Registration
     Statement or Prospectus, until such Holder's or Exchanging Dealer's receipt
     of the copies of the supplemented or amended Prospectus contemplated by
     paragraph 4(k) hereof, or until it is advised in writing by the Company
     that the use of the applicable Prospectus may be resumed.

          (d)  The Company shall use its best efforts to obtain the withdrawal
     of any order suspending the effectiveness of any Registration Statement at
     the earliest possible time.

          (e)  The Company shall furnish to each Holder of securities included
     within the coverage of any Shelf Registration Statement, without charge, at
     least one copy of such Shelf Registration Statement and any post-effective
     amendment thereto, including financial statements and schedules, and, if
     the Holder so requests in writing, any documents incorporated by reference
     therein and all exhibits thereto (including those incorporated by reference
     therein).

          (f)  The Company shall, during the Shelf Registration Period, deliver
     to each Holder of securities included within the coverage of any Shelf
     Registration Statement, without charge, as many copies of the Prospectus
     (including each preliminary Prospectus) included in such Shelf Registration
     Statement and any amendment or supplement thereto as such Holder may
     reasonably request; and the Company
<PAGE>

                                                                              13

     consents to the use of the Prospectus or any amendment or supplement
     thereto by each of the selling Holders of securities in connection with the
     offering and sale of the securities covered by the Prospectus or any
     amendment or supplement thereto.

          (g)  The Company shall furnish to each Exchanging Dealer which so
     requests, without charge, at least one copy of the Exchange Offer
     Registration Statement and any post-effective amendment thereto, including
     financial statements and schedules and, if the Exchanging Dealer so
     requests in writing, any documents incorporated by reference therein and
     all exhibits thereto (including those incorporated by reference therein).

          (h)  The Company shall, during the Exchange Offer Registration Period,
     promptly deliver to each Exchanging Dealer, without charge, as many copies
     of the Prospectus included in such Exchange Offer Registration Statement
     and any amendment or supplement thereto as such Exchanging Dealer may
     reasonably request for delivery by such Exchanging Dealer in connection
     with a sale of New Securities received by it pursuant to the Registered
     Exchange Offer; and the Company consents to the use of the Prospectus or
     any amendment or supplement thereto by any such Exchanging Dealer, as
     aforesaid.

          (i)  Prior to the Registered Exchange Offer or any other offering of
     securities pursuant to any Registration Statement, the Company shall
     register or qualify or cooperate with the Holders of securities included
     therein and their respective counsel in connection with the registration or
     qualification of such securities for offer and sale under the securities or
     blue sky laws of such jurisdictions as any such Holder reasonably requests
     in writing and do any and all other acts or things necessary or advisable
     to enable the offer and sale in such jurisdictions of the securities
     covered by such Registration Statement; provided, however, that the Company
                                             --------  -------
     will not be required to qualify generally to do business in any
     jurisdiction where it is not then so qualified or to take any action which
     would subject it to general
<PAGE>

                                                                              14

     service of process or to taxation in any such jurisdiction where it is not
     then so subject.

          (j)  The Company shall cooperate with the Holders of Securities to
     facilitate the timely preparation and delivery of certificates representing
     Securities to be sold pursuant to any Registration Statement free of any
     restrictive legends and in such denominations and registered in such names
     as Holders may request prior to sales of securities pursuant to such
     Registration Statement.

          (k)  Upon the occurrence of any event contemplated by paragraph
     (c)(2)(iii) above, the Company shall promptly prepare a post-effective
     amendment to any Registration Statement or an amendment or supplement to
     the related Prospectus or file any other required document so that, as
     thereafter delivered to purchasers of the securities included therein, the
     Prospectus will not include an 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.

          (l)  Not later than the effective date of any such Registration
     Statement hereunder, the Company shall provide a CUSIP number for the
     Securities or New Securities, as the case may be, registered under such
     Registration Statement, and provide the Trustee with printed certificates
     for such Securities or New Securities, in a form, if requested by the
     applicable Holder or Holder's Counsel, eligible for deposit with The
     Depository Trust Company or any successor thereto under the Indentures.

          (m)  The Company shall use its best efforts to comply with all
     applicable rules and regulations of the Commission to the extent and so
     long as they are applicable to the Registered Exchange Offer or the Shelf
     Registration and will make generally available to its security holders a
     consolidated earnings statement (which need not be audited) covering a
     twelve-month period commencing after the effective date of the Registration
     Statement and ending not later than 15 months thereafter, as soon as
     practicable after the
<PAGE>

                                                                              15

     end of such period, which consolidated earnings statement shall satisfy the
     provisions of Section 11(a) of the Securities Act.

          (n)  The Company shall cause the Indentures to be qualified under the
     Trust Indenture Act of 1939, as amended, on or prior to the effective date
     of any Shelf Registration Statement or Exchange Offer Registration
     Statement.

          (o)  The Company may require each Holder of securities to be sold
     pursuant to any Shelf Registration Statement to furnish to the Company in
     writing such information regarding the Holder and the distribution of such
     securities as the Company may from time to time reasonably require for
     inclusion in such Registration Statement.  The Company may exclude from any
     such Registration Statement the securities of any such Holder who fails to
     furnish such information within a reasonable time after receiving such
     request.  Each Holder as to which any Shelf Registration is being effected
     agrees to furnish promptly to the Company all information required to be
     disclosed in order to make the information previously furnished to the
     Company by such Holder not materially misleading.

          (p)  The Company shall, if requested, promptly incorporate in a
     Prospectus supplement or post-effective amendment to a Shelf Registration
     Statement, such information as the Managing Underwriters, if any, and
     Majority Holders reasonably agree should be included therein and shall make
     all required filings of such Prospectus supplement or post-effective
     amendment as soon as notified of the matters to be incorporated in such
     Prospectus supplement or post-effective amendment.

     (q)  (i)  In the case of any Shelf Registration Statement, the Company
     shall enter into such agreements (including underwriting agreements) and
     take all other appropriate actions in order to expedite or facilitate the
     registration or the disposition of the Securities, and in connection
     therewith, if an underwriting agreement is entered into, cause the same to
     contain indemnification provisions and procedures no less
<PAGE>

                                                                              16

     favorable than those set forth in Section 6 hereof (or such other
     provisions and procedures acceptable to the Majority Holders and the
     Managing Underwriters, if any), with respect to all parties to be
     indemnified pursuant to Section 6 hereof from Holders of Securities to the
     Company.

               (ii) Without limiting in any way paragraph (q)(i), no Holder may
     participate in any underwritten registration hereunder unless such Holder
     (x) agrees to sell such Holder's securities to be covered by such
     registration on the basis provided in any underwriting arrangements
     approved by the Majority Holders and the Managing Underwriters and (y)
     completes and executes in a timely manner all customary questionnaires,
     powers of attorney, underwriting agreements and other documents reasonably
     required by the Company or the Managing Underwriters in connection with
     such underwriting arrangements.

          (r)  In the case of any Shelf Registration Statement, the Company
     shall (i) make reasonably available for inspection by the Holders of
     securities to be registered thereunder, any underwriter participating in
     any disposition pursuant to such Registration Statement, and any attorney,
     accountant or other agent retained by the Holders or any such underwriter
     all relevant financial and other records, pertinent corporate documents and
     properties of the Company and its subsidiaries reasonably requested by such
     person; (ii) cause the Company's officers, directors and employees to
     supply all relevant information reasonably requested by the Holders or any
     such underwriter, attorney, accountant or agent in connection with any such
     Registration Statement as is customary for due diligence examinations in
     connection with primary underwritten offerings; provided, however, that any
                                                     --------  -------
     information that is nonpublic at the time of delivery of such information
     shall be kept confidential by the Holders or any such underwriter,
     attorney, accountant or agent, unless such disclosure is made in connection
     with a court proceeding or required by law, or such information becomes
     available to the public generally or through a third party without an
<PAGE>

                                                                              17

     accompanying obligation of confidentiality; (iii) make such representations
     and warranties to the Holders of securities registered thereunder and the
     underwriters, if any, in form, substance and scope as are customarily made
     by issuers to underwriters in primary underwritten offerings; (iv) obtain
     opinions of counsel to the Company (which counsel and opinions (in form,
     scope and substance) shall be reasonably satisfactory to the Managing
     Underwriters, if any) addressed to each selling Holder and the
     underwriters, if any, covering such matters as are customarily covered in
     opinions requested in underwritten offerings and such other matters as may
     be reasonably requested by such Holders and underwriters; (v) obtain "cold
     comfort" letters (or, in the case of any person that does not satisfy the
     conditions for receipt of a "cold comfort" letter specified in Statement on
     Auditing Standards No. 72, an "agreed-upon procedures" letter under
     Statement on Auditing Standards No. 35) and updates thereof from the
     independent certified public accountants of the Company (and, if necessary,
     any other independent certified public accountants of any subsidiary of the
     Company or of any business acquired by the Company for which financial
     statements and financial data are, or are required to be, included or
     incorporated by reference in the Registration Statement), addressed to each
     selling Holder of securities registered thereunder and the underwriters, if
     any, in customary form and covering matters of the type customarily covered
     in "cold comfort" letters in connection with primary underwritten
     offerings; and (vi) deliver such documents and certificates as may be
     reasonably requested by the Majority Holders and the Managing Underwriters,
     if any, including those to evidence compliance with Section 4(k) and with
     any customary conditions contained in the underwriting agreement or other
     agreement entered into by the Company.  The foregoing actions set forth in
     clauses (iii), (iv), (v) and (vi) of this Section 4(r) shall be performed
     (A) on the effective date of such Registration Statement and each post-
     effective amendment thereto and (B) at each closing under any underwriting
     or similar agreement as and to the extent required thereunder.
<PAGE>

                                                                              18

          (s)  In the case of any Exchange Offer Registration Statement, the
     Company shall (i) make reasonably available for inspection by each
     Purchaser, and any attorney, accountant or other agent retained by such
     Purchaser, all relevant financial and other records, pertinent corporate
     documents and properties of the Company and its subsidiaries reasonably
     requested by such person; (ii) cause the Company's officers, directors and
     employees to supply all relevant information reasonably requested by such
     Purchaser or any such attorney, accountant or agent in connection with any
     such Registration Statement as is customary for due diligence examinations
     in connection with primary underwritten offerings; provided, however, that
                                                        --------  -------
     any information that is nonpublic at the time of delivery of such
     information shall be kept confidential by such Purchaser or any such
     attorney, accountant or agent, unless such disclosure is made in connection
     with a court proceeding or required by law, or such information becomes
     available to the public generally or through a third party without an
     accompanying obligation of confidentiality; (iii) make such representations
     and warranties to such Purchaser, in form, substance and scope as are
     customarily made by issuers to underwriters in primary underwritten
     offerings; (iv) obtain opinions of counsel to the Company (which counsel
     and opinions (in form, scope and substance) shall be reasonably
     satisfactory to such Purchaser and its counsel), addressed to such
     Purchaser, covering such matters as are customarily covered in opinions
     requested in underwritten offerings and such other matters as may be
     reasonably requested by such Purchaser or its counsel; (v) obtain "cold
     comfort" letters and updates thereof from the independent certified public
     accountants of the Company (and, if necessary, any other independent
     certified public accountants of any subsidiary of the Company or of any
     business acquired by the Company for which financial statements and
     financial data are, or are required to be, included or incorporated by
     reference in the Registration Statement), addressed to such Purchaser, in
     customary form and covering matters of the type customarily covered in
     "cold comfort" letters in connection with primary underwritten offerings,
     or if requested by such Purchaser or its counsel in lieu
<PAGE>

                                                                              19

     of a "cold comfort" letter, an agreed-upon procedures letter under
     Statement on Auditing Standards No. 35, covering matters requested by such
     Purchaser or its counsel; and (vi) deliver such documents and certificates
     as may be reasonably requested by such Purchaser or its counsel, including
     those to evidence compliance with Section 4(k) and with conditions
     customarily contained in underwriting agreements. The foregoing actions set
     forth in clauses (iii), (iv), (v) and (vi) of this Section 4(s) shall be
     performed (A) at the close of the Registered Exchange Offer and (B) on the
     effective date of any post-effective amendment to the Exchange Offer
     Registration Statement.

          5.   Registration Expenses.  The Company shall bear all expenses
               ----------------------
incurred in connection with the performance of its obligations under Sections 2,
3 and 4 hereof and, in the event of any Shelf Registration Statement, will
reimburse the Holders for the reasonable fees and disbursements of one firm or
counsel (in addition to one local counsel in each relevant jurisdiction)
designated by the Majority Holders to act as counsel for the Holders in
connection therewith ("Holders' Counsel").  Notwithstanding the foregoing, the
Holders of the securities being registered shall pay all agency or brokerage
fees and commissions and underwriting discounts and commissions attributable to
the sale of such securities and the fees and disbursements of any counsel or
other advisors or experts retained by such holders (severally or jointly), other
than the counsel and experts specifically referred to above in this Section 5,
transfer taxes on resale of any of the securities by such Holders and any
advertising expenses incurred by or on behalf of such Holders in connection with
any offers they may make.

          6.   Indemnification and Contribution.  (a)  In connection with any
               ---------------------------------
Registration Statement, the Company agrees to indemnify and hold harmless each
Holder of securities covered thereby (including each Purchaser and, with respect
to any Prospectus delivery as contemplated in Section 4(h) hereof, each
Exchanging Dealer), the directors, officers, employees and agents of each such
Holder and each other person, if any, who controls any such Holder within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act
against any and all losses, claims, damages or liabilities, joint or several, to
which
<PAGE>

                                                                              20

they or any of them may become subject under the Securities 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 as
originally filed or in any amendment thereof, or in any preliminary Prospectus
or 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 the Company will not be liable in
                     --------  -------
any 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 such
Holder specifically for inclusion therein; provided further, however, that the
                                           ----------------  -------
indemnity agreement contained in this Section 6(a) shall not inure to the
benefit of any indemnified party to the extent that it is determined by a final,
non-appealable judgment that (i) a preliminary Prospectus contained an untrue
statement of a material fact or omitted to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, (ii) the sale to the person asserting any such losses, claims,
damages or liabilities was an initial resale of securities by any Holder, (iii)
any such loss, claim, damage or liability of such indemnified party results from
the fact that there was not sent or given to such person, at or prior to the
written confirmation of the sale of such securities to such person, a copy of
any revised preliminary Prospectus, the related Prospectus or the related
Prospectus as amended or supplemented in any case where such delivery is
required by the Securities Act, and the Company had previously furnished copies
thereof to such Holder and (iv) the revised preliminary Prospectus, the related
Prospectus or the related Prospectus as amended or supplemented corrected such
untrue statement or omission.
<PAGE>

                                                                              21

This indemnity agreement will be in addition to any liability which the Company
may otherwise have.

          The Company also agrees to indemnify or contribute to Losses (as
defined below) of, as provided in Section 6(d), any underwriters of Securities
registered under a Shelf Registration Statement, their officers, directors,
employees and agents and each person who controls such underwriters on
substantially the same basis as that of the indemnification of the Purchasers
and the selling Holders provided in this Section 6(a) and shall, if requested by
any Holder, enter into an underwriting agreement reflecting such agreement, as
provided in Section 4(q) hereof.

          (b)  Each Holder of securities covered by a Registration Statement
(including each Purchaser and, with respect to any Prospectus delivery as
contemplated in Section 4(h) hereof, each Exchanging Dealer) severally and not
jointly agrees to indemnify and hold harmless the Company, each of its directors
and officers and each other person, if any, who controls the Company within the
meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act to
the same extent as the foregoing indemnity from the Company to each such Holder,
but only with reference to written information relating to such Holder furnished
to the Company by or on behalf of such Holder specifically for inclusion in the
documents referred to in the foregoing indemnity.  This indemnity agreement will
be in addition to any liability which any such Holder may otherwise have.

          (c)  Promptly after receipt by an indemnified party under this Section
6 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 6, 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 forfeiture by the
indemnifying party of substantial rights and defenses 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
<PAGE>

                                                                              22

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 (and local 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
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, 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. It is understood,
however, that the Company shall, in connection with any one such action or
separate but substantially similar or related actions in the same jurisdiction
arising out of the same general allegations or circumstances, be liable for the
reasonable fees and expenses of only one
<PAGE>

                                                                              23

separate firm of attorneys (in addition to any local counsel) at any time for
all such Holders and controlling persons. An indemnifying party shall not be
liable under this Section 6 to any indemnified party regarding any settlement 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 is consented to by such
indemnifying party, which consent shall not be unreasonably withheld.

          (d)  In the event that the indemnity provided in paragraph (a) or (b)
of this Section 6 is unavailable to or insufficient to hold harmless an
indemnified party for any reason, then each applicable indemnifying party, in
lieu of indemnifying such indemnified party, shall have a joint and several
obligation 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 such
indemnified party may be subject in such proportion as is appropriate to reflect
the relative benefits received by such indemnifying party, on the one hand, and
such indemnified party, on the other hand, from the Initial Placement and the
Registration Statement which resulted in such Losses; provided, however, that in
                                                      --------  -------
no case shall any Purchaser or any subsequent Holder of any Security or New
Security be responsible, in the aggregate, for any amount in excess of the
purchase discount or commission applicable to such Security, or in the case of a
New Security, applicable to the Security which was exchangeable into such New
Security, as set forth on the cover page of the Final Memorandum, nor shall any
underwriter be responsible for any amount in excess of the underwriting discount
or commission applicable to the securities purchased by such underwriter under
the Registration Statement which resulted in such Losses.  If the allocation
provided by the immediately preceding sentence is unavailable for any reason,
the indemnifying party and the indemnified party shall contribute in such
proportion as is appropriate to reflect not only such relative benefits but
<PAGE>

                                                                              24

also the relative fault of such indemnifying party, on the one hand, and such
indemnified party, on the other hand, 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 sum of (x) the total net proceeds from the Initial Placement (before
deducting expenses) as set forth on the cover page of the Final Memorandum and
(y) the total amount of additional interest which the Company was not required
to pay as a result of registering the securities covered by the Registration
Statement which resulted in such Losses. Benefits received by the Purchasers
shall be deemed to be equal to the total purchase discounts and commissions as
set forth on the cover page of the Final Memorandum, and benefits received by
any other Holders shall be deemed to be equal to the value of receiving
Securities or New Securities, as applicable, registered under the Securities
Act. Benefits received by any underwriter shall be deemed to be equal to the
total underwriting discounts and commissions, as set forth on the cover page of
the Prospectus forming a part of the Registration Statement which resulted in
such Losses. Relative fault shall be determined by reference to whether any
alleged untrue statement or omission relates to information provided by the
indemnifying party, on the one hand, or by the indemnified party, on the other
hand. The parties 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
Securities Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. For purposes of this Section 6,
each person who controls a Holder within the meaning of either the Securities
Act or the Exchange Act and each director, officer, employee and agent of such
Holder shall have the same rights to contribution as such Holder, and each
person who controls the Company within the meaning of either the Securities 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,
<PAGE>

                                                                              25

subject in each case to the applicable terms and conditions of this paragraph
(d).

          (e)  The provisions of this Section 6 will remain in full force and
effect, regardless of any investigation made by or on behalf of any Purchaser,
any other Holder, the Company or any underwriter or any of the officers,
directors or controlling persons referred to in this Section 6, and will survive
the sale by a Holder of securities covered by a Registration Statement.

          7.   Miscellaneous.
               -------------

          (a)  No Inconsistent Agreements.  The Company has not, as of the date
               ---------------------------
hereof, entered into, nor shall it, on or after the date hereof, enter into, any
agreement with respect to its securities that limits the rights granted to the
Holders herein or otherwise conflicts with the provisions hereof.

          (b)  Amendments and Waivers.  The provisions of this Agreement,
               -----------------------
including the provisions of this sentence, may not be amended, qualified,
modified or supplemented, and waivers or consents to departures from the
provisions hereof may not be given, unless the Company has obtained the written
consent of the Holders of at least a majority of the then outstanding aggregate
principal amount of Securities (or, after the consummation of any Exchange Offer
in accordance with Section 2 hereof, of New Securities); provided that, with
                                                         --------
respect to any matter that directly or indirectly affects the rights of any
Purchaser hereunder, the Company shall obtain the written consent of each such
Purchaser against which such amendment, qualification, supplement, waiver or
consent is to be effective.  Notwithstanding the foregoing (except the foregoing
proviso), a waiver or consent to departure from the provisions hereof with
respect to a matter that relates exclusively to the rights of Holders whose
securities are being sold pursuant to a Registration Statement and that does not
directly or indirectly affect the rights of other Holders may be given by the
Majority Holders, determined on the basis of securities being sold rather than
registered under such Registration Statement.
<PAGE>

                                                                              26

          (c)  Notices.  All notices and other communications provided for or
               -------
permitted hereunder shall be made in writing by hand-delivery, first-class mail,
facsimile, or air courier guaranteeing overnight delivery:

               (1) if to a Holder, at the most current address given by such
          Holder to the Company in accordance with the provisions of this
          Section 7(c), which address initially is, with respect to each Holder,
          the address of such Holder maintained by the registrar under the
          Indentures, with a copy in like manner to Salomon Smith Barney Inc. by
          facsimile (212-816-7912) and confirmed by mail to it at 388 Greenwich
          Street, New York, New York 10013, Attention: General Counsel;

               (2) if to you, initially at the address set forth in the Purchase
          Agreement; and

               (3) if to the Company, initially at its address set forth in the
          Purchase Agreement.

          All such notices and communications shall be deemed to have been duly
given when received.

          The Purchasers or the Company by notice to the other may designate
additional or different addresses for subsequent notices or communications.

          (d)  Successors and Assigns.  This Agreement shall inure to the
               -----------------------
benefit of and be binding upon the successors and assigns of each of the
parties, including, without the need for an express assignment or any consent by
the Company or subsequent Holders of Securities and/or New Securities.  The
Company hereby agrees to extend the benefits of this Agreement to any Holder of
Securities and/or New Securities and any such Holder may specifically enforce
the provisions of this Agreement as if an original party hereto.

          (e)  Counterparts.  This Agreement may be executed in any number of
               -------------
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.
<PAGE>

                                                                              27

          (f)  Headings.  The headings in this Agreement are for convenience of
               ---------
reference only and shall not limit or otherwise affect the meaning hereof.

          (g)  Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
               --------------
IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD TO
THE CONFLICT OF LAW PROVISIONS THEREOF).

          (h)  Severability.  In the event that any one of more of the
               -------------
provisions contained herein, or the application thereof in any circumstances, is
held invalid, illegal or unenforceable in any respect for any reason, the
validity, legality and enforceability of any such provision in every other
respect and of the remaining provisions hereof shall not be in any way impaired
or affected thereby, it being intended that all the rights and privileges of the
parties shall be enforceable to the fullest extent permitted by law.

          (i)  Securities Held by the Company, etc.  Whenever the consent or
               ------------------------------------
approval of Holders of a specified percentage of principal amount of Securities
or New Securities is required hereunder, Securities or New Securities, as
applicable, held by the Company or its Affiliates (other than subsequent Holders
of Securities or New Securities if such subsequent Holders are deemed to be
Affiliates solely by reason of their holdings of such Securities or New
Securities) shall not be counted in determining whether such consent or approval
was given by the Holders of such required percentage.

          (j)  Termination.  This Agreement shall automatically terminate,
               ------------
without any further action on the part of the Company or the Purchasers, upon
the termination or cancelation of the Purchase Agreement prior to the Closing
Date.
<PAGE>

                                                                              28

          Please confirm that the foregoing correctly sets forth the agreement
between the Company and you.

                              Very truly yours,

                              LEVEL 3 COMMUNICATIONS, INC.

                              By: /s/ Thomas C. Stortz
                                 __________________________
                                 Name:  Thomas C. Stortz
                                 Title: Group Vice President,
                                        General Counsel and Secretary

The foregoing Agreement is
hereby confirmed and accepted
as of the date first above written

To:  SALOMON SMITH BARNEY INC.
GOLDMAN, SACHS & CO.
MORGAN STANLEY & CO. INCORPORATED
CHASE SECURITIES INC.
J.P. MORGAN SECURITIES INC.
CREDIT SUISSE FIRST BOSTON CORPORATION
BNY CAPITAL MARKETS, INC.
FIRST UNION SECURITIES, INC.

By:  SALOMON SMITH BARNEY INC.

By: /s/ D. Scott Miller
  _______________________
  Name:  D. Scott Miller
  Title: Managing Director
<PAGE>

                                                                         ANNEX A

Each broker-dealer that receives New Securities for its own account pursuant to
the Registered Exchange Offer must acknowledge that it will deliver a prospectus
in connection with any resale of such New Securities.  The Letter of Transmittal
states that by so acknowledging and by delivering a prospectus, a broker-dealer
will not be deemed to admit that it is an "underwriter" within the meaning of
the Securities Act.  This Prospectus, as it may be amended or supplemented from
time to time, may be used by a broker-dealer in connection with resales of New
Securities received in exchange for Securities where such New Securities were
acquired by such broker-dealer as a result of market-making activities or other
trading activities.  The Company has agreed that, starting on the date hereof
(the "Expiration Date") and ending on the close of business on the day that is
180 days following the Expiration Date, it will make this Prospectus available
to any broker-dealer for use in connection with any such resale.  See "Plan of
Distribution."
<PAGE>

                                                                         ANNEX B

Each broker-dealer that receives New Securities for its own account in exchange
for Securities, where such Securities were acquired by such broker-dealer as a
result of market-making activities or other trading activities, must acknowledge
that it will deliver a prospectus in connection with any resale of such New
Securities.  See "Plan of Distribution."
<PAGE>

                                                                         ANNEX C

                             PLAN OF DISTRIBUTION

       Each broker-dealer that receives New Securities for its own account
pursuant to the Registered Exchange Offer must acknowledge that it will deliver
a prospectus in connection with any resale of such New Securities.  The
Prospectus, as it may be amended or supplemented from time to time, may be used
by a broker-dealer in connection with resales of New Securities received in
exchange for Securities where such Securities were acquired as a result of
market-making activities or other trading activities.  The Company has agreed
that, starting on the Expiration Date and ending on the close of business on the
day that is 180 days following the Expiration Date, it will make this
Prospectus, as amended or supplemented, available to any broker-dealer for use
in connection with any such resale.  In addition, until             , 2000, all
dealers effecting transactions in the Exchange Securities may be required to
deliver a prospectus. */
                      -

       The Company will not receive any proceeds from any sale of New Securities
by broker-dealers.  New Securities received by broker-dealers for their own
account pursuant to the Exchange Offer may be sold from time to time in one or
more transactions in the over-the-counter market, in negotiated transactions,
through the writing of options on the New Securities or a combination of such
methods of resale, at market prices prevailing at the time of resale, at prices
related to such prevailing market prices or negotiated prices.  Any such resale
may be made directly to purchasers or to or through brokers or dealers who may
receive compensation in the form of commissions or

*/ In addition, the legend required by Item 502(e) of Regulation S-K will appear
-
on the back cover page of the Exchange Offer Prospectus.
<PAGE>

concessions from any such broker-dealer and/or the purchasers of any such New
Securities. Any broker-dealer that resells New Securities that were received by
it for its own account pursuant to the Registered Exchange Offer and any broker
or dealer that participates in a distribution of such New Securities may be
deemed to be an "underwriter" within the meaning of the Securities Act and any
profit of any such resale of New Securities and any commissions or concessions
received by any such persons may be deemed to be underwriting compensation under
the Securities Act. The Letter of Transmittal states that by acknowledging that
it will deliver and by delivering a prospectus, a broker-dealer will not be
deemed to admit that it is an "underwriter" within the meaning of the Securities
Act.

       For a period of 180 days after the Expiration Date, the Company will
promptly send additional copies of this Prospectus and any amendment or
supplement to this Prospectus to any broker-dealer that requests such documents
in the Letter of Transmittal.  The Company has agreed to pay all expenses
incident to the Exchange Offer (other than the expenses of counsel for the
holders of the Securities) other than commissions or concessions of any brokers
or dealers and will indemnify the holders of the Securities (including any
broker-dealers) against certain liabilities, including liabilities under the
Securities Act.

     [If applicable, add information required by Regulation S-K Items 507 and/or
508.]
<PAGE>

                                                                         ANNEX D

                                    Rider A
                                    -------

  [_]  CHECK HERE IF YOU ARE A BROKER-DEALER AND WISH TO RECEIVE 10 ADDITIONAL
       COPIES OF THE PROSPECTUS AND 10 COPIES OF ANY AMENDMENTS OR SUPPLEMENTS
       THERETO.

       Name: ____________________________________________________

       Address: _________________________________________________

                _________________________________________________

                                    Rider B
                                    -------

If the undersigned is not a broker-dealer, the undersigned represents that it is
not engaged in, and does not intend to engage in, a distribution of New
Securities.  If the undersigned is a broker-dealer that will receive New
Securities for its own account in exchange for Securities that were acquired as
a result of market-making activities or other trading activities, it
acknowledges that it will deliver a prospectus in connection with any resale of
such New Securities; however, by so acknowledging and by delivering a
prospectus, the undersigned will not be deemed to admit that it is an
"underwriter" within the meaning of the Securities Act.

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