PSINET INC
8-K, 1998-04-23
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 8-K


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


         Date of Report (Date of earliest event reported) April 13, 1998


                                   PSINet Inc.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


         New York                     0-25812                    16-1353600
- --------------------------------------------------------------------------------
(State or other jurisdiction           (Commission              (IRS Employer
        of incorporation)              File Number)          Identification No.)


510 Huntmar Park Drive, Herndon, Virginia                            20170
- --------------------------------------------------------------------------------
(Address of principal executive offices)                              (Zip Code)



Registrant's telephone number, including area code (703) 904-4100



         (Former name or former address, if changed since last report)
- --------------------------------------------------------------------------------



                                 Page 1 of 162
<PAGE>


Item 5.       Other Events

         On April 13, 1998, PSINet Inc. (the "Company") completed its previously
announced  offering of $600  million  aggregate  principal  amount of 10% Senior
Notes due 2005 (the  "Notes").  The Notes  were  issued  and sold to  Donaldson,
Lufkin & Jenrette Securities Corporation,  Merrill Lynch, Pierce, Fenner & Smith
Incorporated  and Chase  Securities  Inc., as initial  purchasers  (the "Initial
Purchasers"),  in reliance on Section  4(2) of the  Securities  Act of 1933,  as
amended (the "Securities  Act"), as a transaction by an issuer not involving any
public offering. The Initial Purchasers advised the Company that they resold the
Notes  to  persons  whom  the  Initial  Purchasers  reasonably  believed  to  be
"qualified  institutional  buyers" (as defined in Rule 144A under the Securities
Act) and to persons permitted to purchase the Notes in offshore  transactions in
reliance  on  Regulation  S under the  Securities  Act. In  connection  with the
offering,  the Initial  Purchasers had adequate access to information  regarding
the Company,  each of the Initial  Purchasers made certain  representations  and
warranties to the Company,  including,  among others, that it was an "accredited
investor" (as defined in Rule 501 of Regulation D under the Securities  Act) and
was not  acquiring  the  Notes  with a view  to any  distribution  thereof  in a
transaction  that would  violate the  Securities  Act, and  appropriate  legends
regarding  the  restricted  nature  of the  Notes  were  affixed  to the  global
certificates representing the Notes.

         The Notes are senior unsecured  obligations of the Company ranking pari
passu  in  right  of  payment  with  all  existing  and  future   unsecured  and
unsubordinated indebtedness of the Company and senior in right of payment to all
existing and future subordinated indebtedness of the Company.

         The Notes will mature on February 15, 2005.  Interest on the Notes will
be payable  semi-annually on August 15 and February 15 of each year,  commencing
August 15, 1998.  The Notes will be redeemable at the option of the Company,  in
whole or in part, at any time on or after February 15 of 2002,  2003 and 2004 at
105%, 102% and 100% of the principal amount thereof, respectively, in each case,
plus accrued and unpaid interest to the date of redemption.  In addition,  on or
prior to February  15,  2001,  the Company may redeem up to 35% of the  original
aggregate  principal  amount of the Notes at a  redemption  price of 110% of the
principal  amount  thereof,  plus  accrued  and unpaid  interest  to the date of
redemption, with the net cash proceeds of certain public equity offerings or the
sale of stock to one or more strategic investors,  provided that at least 65% of
the  original  aggregate  principal  amount  of the  Notes  remains  outstanding
immediately  after such  redemption.  Upon the  occurrence of certain  change of
control  events,  the Company  will be required to make an offer to purchase the
Notes at a purchase price equal to 101% of the principal  amount  thereof,  plus
accrued and unpaid interest, if any, to the date of repurchase.

         The  net  proceeds  of the  offering,  after  deducting  discounts  and
commissions  and expenses  payable by the Company,  were  approximately  $580.75
million.  Concurrently  with the closing of the offering,  the Company deposited
$138.7 million of such net proceeds into an escrow account, which, together with
the proceeds of the investment  thereof,  will be sufficient to pay when due the
first five  semi-annual  interest  payments on the Notes.  Of the  remaining net
proceeds of the offering,  $20 million were used to repay  certain  indebtedness
and  the  balance  are  expected  to be  used to  finance  capital  expenditures
(including, without limitation,  facilities and 



                                 Page 2 of 162
<PAGE>

equipment in  connection  with the  development  and  expansion of the Company's
domestic and international network) and working capital requirements (including,
without limitation,  debt service  obligations) of the Company.  In addition,  a
portion of the net proceeds is expected to be used to make strategic investments
in or  acquisitions  of businesses  or assets  related or  complementary  to the
Company's existing business.

         There is no  established  trading  market for the Notes and the Company
does not intend to apply for listing on any securities  exchange;  however,  the
Notes are  eligible  for  trading in the Private  Offerings,  Resale and Trading
through  Automated  Linkages  ("PORTAL")  market of the National  Association of
Securities  Dealers,  Inc.  The Notes have been  rated B3 by  Moody's  Investors
Service and B- by Standard & Poor's.

Item 7.   Financial Statements, Pro Forma Financial Information and Exhibits

        (c)      Exhibits

                 Exhibit 4.1         Indenture, dated as of April 13, 1998, 
                                     between PSINet Inc. and Wilmington Trust
                                     Company, as trustee

                 Exhibit 4.2         Form of 10% Senior Note Due 2005, Series A

                 Exhibit 10.1        Registration Rights Agreement,  dated as of
                                     April 13, 1998, among PSINet Inc.  and
                                     Donaldson Lufkin & Jenrette Securities  
                                     Corporation, Merrill Lynch, Pierce,  Fenner
                                     &  Smith Incorporated and Chase Securities
                                     Inc.

                 Exhibit 10.2        Interest  Escrow  Agreement, dated as of 
                                     April 13, 1998, among PSINet Inc. and 
                                     Wilmington  Trust Company,  as  escrow  
                                     agent, and Wilmington  Trust  Company,  as
                                     trustee




                                 Page 3 of 162
<PAGE>


         SIGNATURES

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


Dated:  April 22, 1998                           PSINET INC.


                                                 By: /s/ Kathleen B. Horne
                                                     Kathleen B. Horne
                                                     Vice President



                                 Page 4 of 162
<PAGE>


                                  EXHIBIT INDEX




      Exhibit
       Number         Exhibit Name                                     Location
       ------         ------------                                     --------
         4.1          Indenture, dated as of April 13, 1998,                6
                      between PSINet Inc. and Wilmington
                      Trust Company, as trustee
         4.2          Form of 10% Senior Note Due 2005, Series A          117
        10.1          Registration Rights Agreement, dated as of          126
                      April 13, 1998, among PSINet Inc. and
                      Donaldson Lufkin & Jenrette Securities 
                      Corporation, Merrill Lynch, Pierce, 
                      Fenner & Smith Incorporated and Chase 
                      Securities Inc.
        10.2          Interest Escrow Agreement, dated as of              148
                      April 13, 1998, among PSINet Inc. and 
                      Wilmington Trust Company, as escrow agent, 
                      and Wilmington Trust Company, as trustee





                                 Page 5 of 162






                                                                    Exhibit 4.1






                                   PSINET INC.

                                  $600,000,000

                            10% SENIOR NOTES DUE 2005


                                     -------

                                    INDENTURE


                           Dated As Of April 13, 1998

                                     -------


                            WILMINGTON TRUST COMPANY

                                     Trustee





                                 Page 6 of 162
<PAGE>



                              CROSS-REFERENCE TABLE

                  Reconciliation and tie between Trust Indenture Act of 1939, as
amended, and Indenture, dated as of April 13, 1998


                    Trust Indenture                       Indenture
                    Act Section                           Section

                    310(a)(1)...........................  6.09
                    (a)(2)..............................  6.09
                    (b).................................  6.08
                    311(a)..............................  6.13
                    312(a)..............................  7.01
                    (b).................................  7.02
                    (c).................................  7.02
                    313(a)..............................  7.03
                    (b)(2)..............................  7.03
                    (c).................................  7.03, 7.04
                    (d).................................  7.03
                    314(a)..............................  7.04
                    (c)(1)                                1.03
                    (c)(2)..............................  1.03
                    (e).................................  1.03
                    315(a)..............................  6.01(b)
                    (b).................................  6.02
                    (c).................................  6.01(a)
                    (d).................................  6.01(c), 6.03
                    (e).................................  5.14
                    316(a)(last sentence)...............  1.01("Outstanding")
                    (a)(1)(A)...........................  5.12
                    (a)(1)(B)...........................  5.13
                    (b).................................  5.08
                    (c).................................  1.05
                    317(a)(1)...........................  5.03
                    (a)(2)..............................  5.04
                    (b).................................  6.05
                    318(a)..............................  1.08


                                 Page 7 of 162
<PAGE>



                                TABLE OF CONTENTS

                                                                           Page


ARTICLE I DEFINITIONS AND OTHER PROVISIONS OF GENERAL APPLICATION............12

SECTION 1.01. CONSTRUCTION...................................................12
SECTION 1.02. DEFINITIONS....................................................13
SECTION 1.03. COMPLIANCE CERTIFICATES AND OPINIONS...........................31
SECTION 1.04. FORM OF DOCUMENTS DELIVERED TO TRUSTEE.........................32
SECTION 1.05. ACTS OF HOLDERS................................................32
SECTION 1.06. NOTICES, ETC., TO THE TRUSTEE, THE COMPANY AND ANY 
              GUARANTOR......................................................33
SECTION 1.07. TO HOLDERS; WAIVER.............................................34
SECTION 1.08. CONFLICT WITH TRUST INDENTURE ACT..............................34
SECTION 1.09. EFFECT OF HEADINGS AND TABLE OF CONTENTS.......................34
SECTION 1.10. SUCCESSORS AND ASSIGNS.........................................34
SECTION 1.11. SEPARABILITY CLAUSE............................................35
SECTION 1.12. BENEFITS OF INDENTURE..........................................35
SECTION 1.13. GOVERNING LAW..................................................35
SECTION 1.14. LEGAL HOLIDAYS.................................................35
SECTION 1.15. INDEPENDENCE OF COVENANTS......................................35
SECTION 1.16. SCHEDULES AND EXHIBITS.........................................35
SECTION 1.17. COUNTERPARTS...................................................35
SECTION 1.18. NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS..................35
SECTION 1.19. NO RECOURSE AGAINST OTHERS.....................................36

ARTICLE II NOTES FORMS.......................................................36

SECTION 2.01. FORMS GENERALLY................................................36
SECTION 2.02. FORM OF FACE OF NOTE...........................................37

ARTICLE III THE NOTES........................................................51

SECTION 3.01. TITLE AND TERMS................................................51
SECTION 3.02. DENOMINATIONS..................................................52
SECTION 3.03. EXECUTION, AUTHENTICATION, DELIVERY AND DATING.................52
SECTION 3.04. TEMPORARY NOTES................................................53
SECTION 3.05. REGISTRATION, REGISTRATION OF TRANSFER AND EXCHANGE............53
SECTION 3.06. BOOK ENTRY PROVISIONS FOR GLOBAL NOTES.........................55
SECTION 3.07. SPECIAL TRANSFER AND EXCHANGE PROVISIONS.......................56
SECTION 3.08. MUTILATED, DESTROYED, LOST AND STOLEN NOTES....................58
SECTION 3.09. PAYMENT OF INTEREST; INTEREST RIGHTS PRESERVED.................58
SECTION 3.10. CUSIP NUMBERS..................................................59
SECTION 3.11. PERSONS DEEMED OWNERS..........................................59
SECTION 3.12. CANCELLATION...................................................60
SECTION 3.13. COMPUTATION OF INTEREST........................................60

ARTICLE IV DEFEASANCE AND COVENANT DEFEASANCE................................60

SECTION 4.01. COMPANY'S OPTION TO EFFECT DEFEASANCE OR 
              COVENANT DEFEASANCE............................................60


                                 Page 8 of 162
<PAGE>

SECTION 4.02. DEFEASANCE AND DISCHARGE.......................................60
SECTION 4.03. COVENANT DEFEASANCE............................................61
SECTION 4.04. CONDITIONS TO DEFEASANCE OR COVENANT DEFEASANCE................61
SECTION 4.05. DEPOSITED MONEY AND U.S. GOVERNMENT OBLIGATIONS TO 
              BE HELD IN TRUST; OTHER MISCELLANEOUS PROVISIONS...............63
SECTION 4.06. REINSTATEMENT..................................................63

ARTICLE V REMEDIES...........................................................64

SECTION 5.01. EVENTS OF DEFAULT..............................................64
SECTION 5.02. ACCELERATION OF MATURITY; RESCISSION AND ANNULMENT.............65
SECTION 5.03. COLLECTION OF INDEBTEDNESS AND SUITS FOR ENFORCEMENT 
              BY TRUSTEE....................................                 66
SECTION 5.04. TRUSTEE MAY FILE PROOFS OF CLAIM...............................67
SECTION 5.05. TRUSTEE MAY ENFORCE CLAIMS WITHOUT POSSESSION OF NOTES.........68
SECTION 5.06. APPLICATION OF MONEY COLLECTED.................................68
SECTION 5.07. LIMITATION ON SUITS............................................68
SECTION 5.08. UNCONDITIONAL RIGHT OF HOLDERS TO RECEIVE PRINCIPAL, 
              PREMIUM AND INTEREST..........................                 69
SECTION 5.09. RESTORATION OF RIGHTS AND REMEDIES.............................69
SECTION 5.10. RIGHTS AND REMEDIES CUMULATIVE.................................69
SECTION 5.11. DELAY OR OMISSION NOT WAIVER...................................69
SECTION 5.12. CONTROL BY HOLDERS.............................................69
SECTION 5.13. WAIVER OF PAST DEFAULTS........................................70
SECTION 5.14. UNDERTAKING FOR COSTS..........................................70
SECTION 5.15. WAIVER OF STAY, EXTENSION OR USURY LAWS........................70
SECTION 5.16. REMEDIES SUBJECT TO APPLICABLE LAW.............................71

ARTICLE VI THE TRUSTEE.......................................................71

SECTION 6.01. DUTIES OF TRUSTEE..............................................71
SECTION 6.02. NOTICE OF DEFAULTS.............................................72
SECTION 6.03. CERTAIN RIGHTS OF TRUSTEE......................................72
SECTION 6.04. TRUSTEE NOT RESPONSIBLE FOR RECITALS, DISPOSITIONS 
              OF NOTES OR APPLICATION OF PROCEEDS THEREOF.....               73
SECTION 6.05. TRUSTEE AND AGENTS MAY HOLD NOTES; COLLECTIONS; ETC............73
SECTION 6.06. MONEY HELD IN TRUST............................................74
SECTION 6.07. COMPENSATION AND INDEMNIFICATION OF TRUSTEE AND ITS
              PRIOR CLAIM....................................                74
SECTION 6.08. CONFLICTING INTERESTS..........................................75
SECTION 6.09. TRUSTEE ELIGIBILITY............................................75
SECTION 6.10. RESIGNATION AND REMOVAL; APPOINTMENT OF SUCCESSOR 
              TRUSTEE..........................................              75
SECTION 6.11. ACCEPTANCE OF APPOINTMENT BY SUCCESSOR.........................76
SECTION 6.12. MERGER, CONVERSION, CONSOLIDATION OR SUCCESSION TO
              BUSINESS.......................................                77
SECTION 6.13. PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY..............77

ARTICLE VII HOLDERS' LISTS AND REPORTS BY TRUSTEE AND COMPANY................77

SECTION 7.01. COMPANY TO FURNISH TRUSTEE NAMES AND ADDRESSES OF 
              HOLDERS.  THE COMPANY WILL FURNISH OR CAUSE TO BE 
              FURNISHED TO THE TRUSTEE.......................................77
SECTION 7.02. DISCLOSURE OF NAMES AND ADDRESSES OF HOLDERS...................78
SECTION 7.03. REPORTS BY TRUSTEE.............................................78
SECTION 7.04. REPORTS BY COMPANY.............................................78

ARTICLE VIII CONSOLIDATION, MERGER, SALE OF ASSETS...........................79

SECTION 8.01. COMPANY AND GUARANTORS MAY CONSOLIDATE, ETC.,
              ONLY ON CERTAIN TERMS................................          79
SECTION 8.02. SUCCESSOR SUBSTITUTED..........................................80

ARTICLE IX SUPPLEMENTAL INDENTURES...........................................80

SECTION 9.01. SUPPLEMENTAL INDENTURES AND AGREEMENTS WITHOUT 
              CONSENT OF HOLDERS..................................           80


                                 Page 9 of 162
<PAGE>

SECTION 9.02. SUPPLEMENTAL INDENTURES AND AGREEMENTS WITH 
              CONSENT OF HOLDERS.....................................        81
SECTION 9.03. EXECUTION OF SUPPLEMENTAL INDENTURES AND AGREEMENTS............82
SECTION 9.04. EFFECT OF SUPPLEMENTAL INDENTURES..............................82
SECTION 9.05. CONFORMITY WITH TRUST INDENTURE ACT............................83
SECTION 9.06. REFERENCE IN NOTES TO SUPPLEMENTAL INDENTURES..................83
SECTION 9.07. NOTICE OF SUPPLEMENTAL INDENTURES..............................83

ARTICLE X COVENANTS..........................................................83

SECTION 10.01. PAYMENT OF PRINCIPAL, PREMIUM AND INTEREST....................83
SECTION 10.02. MAINTENANCE OF OFFICE OR AGENCY...............................83
SECTION 10.03. MONEY FOR NOTE PAYMENTS TO BE HELD IN TRUST...................84
SECTION 10.04. CORPORATE EXISTENCE...........................................85
SECTION 10.05. PAYMENT OF TAXES AND OTHER CLAIMS.............................85
SECTION 10.06. MAINTENANCE OF PROPERTIES.....................................85
SECTION 10.07. MAINTENANCE OF INSURANCE......................................86
SECTION 10.08. LIMITATION ON INDEBTEDNESS....................................86
SECTION 10.09. LIMITATION ON RESTRICTED PAYMENTS.............................88
SECTION 10.10. LIMITATION ON TRANSACTIONS WITH AFFILIATES....................91
SECTION 10.11. LIMITATION ON LIENS...........................................92
SECTION 10.12. LIMITATION ON SALE OF ASSETS..................................92
SECTION 10.13. LIMITATION ON ISSUANCES OF GUARANTEES OF INDEBTEDNESS.........93
SECTION 10.14. PURCHASE OF NOTES UPON A CHANGE OF CONTROL....................94
SECTION 10.15. LIMITATION ON SALE-LEASEBACK TRANSACTIONS.....................96
SECTION 10.16. LIMITATION ON ISSUANCE AND SALE OF SUBSIDIARY CAPITAL 
               STOCK.......................................                  97
SECTION 10.17. LIMITATION ON DIVIDENDS AND OTHER PAYMENT 
               RESTRICTIONS  AFFECTING SUBSIDIARIES....................      97
SECTION 10.18. LIMITATIONS ON UNRESTRICTED SUBSIDIARIES......................98
SECTION 10.19. PROVISION OF FINANCIAL STATEMENTS.............................98
SECTION 10.20. STATEMENT BY OFFICERS AS TO DEFAULT...........................99
SECTION 10.21. WAIVER OF CERTAIN COVENANTS...................................99
SECTION 10.22. LIMITATION ON BUSINESS........................................99
SECTION 10.23. DEPOSIT OF FUNDS WITH ESCROW AGENT............................99

ARTICLE XI REDEMPTION OF NOTES..............................................100

SECTION 11.01. RIGHTS OF REDEMPTION.........................................100
SECTION 11.02. APPLICABILITY OF ARTICLE.....................................100
SECTION 11.03. ELECTION TO REDEEM; NOTICE TO TRUSTEE........................100
SECTION 11.04. SELECTION BY TRUSTEE OF NOTES TO BE REDEEMED.................100
SECTION 11.05. NOTICE OF REDEMPTION.........................................101
SECTION 11.06. DEPOSIT OF REDEMPTION PRICE..................................101
SECTION 11.07. NOTES PAYABLE ON REDEMPTION DATE.............................102
SECTION 11.08. NOTES REDEEMED IN PART.......................................102

ARTICLE XII SATISFACTION AND DISCHARGE......................................102

SECTION 12.01. SATISFACTION AND DISCHARGE OF INDENTURE......................102
SECTION 12.02. APPLICATION OF TRUST MONEY...................................103

ARTICLE XIII COLLATERAL AND SECURITY........................................103

SECTION 13.01. ESCROW AGREEMENT.............................................103
SECTION 13.02. RECORDING AND OPINIONS.......................................104
SECTION 13.03. RELEASE OF COLLATERAL........................................104


                                 Page 10 of 162
<PAGE>

SECTION 13.04. AUTHORIZATION OF ACTIONS TO BE TAKEN BY THE TRUSTEE
                  UNDER THE ESCROW AGREEMENT................................105
SECTION 13.05. AUTHORIZATION OF RECEIPT OF FUNDS BY THE TRUSTEE UNDER 
               THE ESCROW AGREEMENT.........................................105
SECTION 13.06. TERMINATION OF SECURITY INTEREST.............................105


                                 Page 11 of 162
<PAGE>


INDENTURE,  dated  as of  April  13,  1998,  between  PSINET  INC.,  a New  York
corporation  ("Company"),  and  WILMINGTON  TRUST  COMPANY,  a Delaware  banking
corporation, as trustee ("Trustee").



                             RECITALS OF THE COMPANY


                  The Company has duly  authorized the issuance of  $600,000,000
aggregate  principal  amount  of its 10%  Senior  Notes due 2005  ("Notes"),  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.

                  This  Indenture  is subject to, and shall be governed  by, the
provisions  of the Trust  Indenture  Act that are  required to be part of and to
govern indentures qualified under the Trust Indenture Act.

                  All acts  and  things  necessary  have  been  done to make the
Notes,  when duly  issued and  executed by the  Company  and  authenticated  and
delivered  hereunder,  the valid  obligations  of the  Company  and to make this
Indenture a valid  instrument of the Company,  in  accordance  with the terms of
this Indenture.

                   NOW, THEREFORE, THIS INDENTURE WITNESSETH:

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

                                    ARTICLE I
             Definitions And Other Provisions of General Application

                  Section   1.01.   Construction.   For  all  purposes  of  this
Indenture,  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 GAAP;

                  (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 or other subdivision;

                  (e) all references to $, US$, dollars or United States dollars
shall refer to the lawful currency of the United States of America; and

                                 Page 12 of 162
<PAGE>


                  (f) all references  herein to particular  Sections or Articles
refer to this Indenture unless otherwise so indicated.

                  Section 1.02.  ...Definitions.  Certain terms used principally
in  Article IV are  defined  in Article  IV.  Certain  other  terms are  defined
elsewhere in the Indenture.

                  "Acquired  Indebtedness"  means  Indebtedness  of a Person (i)
existing  at the time  such  Person  becomes a  Subsidiary  or (ii)  assumed  in
connection with the acquisition of assets from (or merger or consolidation  with
or into)  such  Person,  in each  case,  other  than  Indebtedness  incurred  in
connection  with, or in  contemplation  of, such Person becoming a Subsidiary or
such acquisition,  as the case may be, provided that Indebtedness of such Person
which is  redeemed,  defeased,  retired or  otherwise  repaid at the time of, or
substantially  contemporaneously  with, the  consummation of the transactions by
which such  Person  becomes a  Subsidiary  or such asset  acquisition  shall not
constitute Acquired Indebtedness.

                  "Acquired Person" means, with respect to any specified Person,
any other  Person  which  merges  with or into or becomes a  Subsidiary  of such
specified Person.

                  "Acquisition" means (i) any 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) by the Company or any
Subsidiary to any other Person,  or any acquisition or purchase of Capital Stock
of any other Person by the Company or any Subsidiary, in either case pursuant to
which such Person  shall become a Subsidiary  or shall be  consolidated,  merged
with or into  the  Company  or any  Subsidiary  or (ii) any  acquisition  by the
Company  or  any  Subsidiary  of  the  assets  of any  Person  which  constitute
substantially  all of an  operating  unit or line of  business of such Person or
which is otherwise  outside of the ordinary course of business of the Company or
such Subsidiary.

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

                  "Applicable Procedures" means, with respect to any transfer or
transaction  involving a Global Note or beneficial  interest therein,  the rules
and procedures of the Depositary for such Note to the extent  applicable to such
transaction and as in effect at the time of such transfer or transaction.

                  "Asset Sale" means any sale, issuance,  conveyance,  transfer,
lease or other disposition  (including,  without  limitation,  by way of merger,
consolidation or sale and leaseback transaction)  (collectively,  a "transfer"),
directly or indirectly, in one or a series of related transactions,  of: (i) any
Capital Stock of any Subsidiary; (ii) all or substantially all of the properties
and  assets  of  any  division  or  line  of  business  of  the  Company  or its
Subsidiaries;  or (iii) any other  properties  or assets of the  Company  or any
Subsidiary  other than in the ordinary  course of business.  For the purposes of
this  definition,  the term  "Asset  Sale"  shall not  include  any  transfer of
properties and assets (A) that is governed by the provisions of Section 8.01 (B)
that is by the Company to any  Wholly-Owned  Subsidiary  or by any  Wholly-Owned
Subsidiary to the Company or any other Wholly-Owned  Subsidiary in a manner that
does not violate the terms of this Indenture,  (C) that is of obsolete equipment
in the ordinary  course of  business,  (D) the Fair Market Value of which in the
aggregate  does not exceed $5 million  in any  transaction  or series of related
transactions,  (E) that is made in accordance  with the provisions  described in
Section 10.09, (F) which  constitutes the granting of any Permitted Lien and (G)
that is transferred in exchange for Telecommunications  Assets; provided that if
the Fair  Market  Value of the assets to be  




                                 Page 13 of 162
<PAGE>

transferred  by the Company or such  Subsidiary  under this clause (G), plus the
Fair Market Value of any other  consideration paid or credited by the Company or
such Subsidiary exceeds $10 million,  such transaction shall require approval of
the Board of Directors of the Company.

                  "Average  Life to Stated  Maturity"  means,  as of the date of
determination  with  respect  to any  Indebtedness,  the  quotient  obtained  by
dividing (i) the sum of the products of (a) the number of years from the date of
determination  to the  date or  dates  of each  successive  scheduled  principal
payment of such Indebtedness multiplied by (b) the amount of each such principal
payment; by (ii) the sum of all such principal payments.

                  "Bankruptcy Law" means Title 11, United States Bankruptcy Code
of 1978, as amended,  or any similar United States federal or state law relating
to bankruptcy, insolvency, receivership, winding up, liquidation, reorganization
or relief of debtors or any  amendment  to,  succession to or change in any such
law.

                  "Board  of  Directors"  means the  board of  directors  of the
Company or any Guarantor,  as the case may be, or any duly authorized  committee
of such board.

                  "Board  Resolution" means a copy of a resolution  certified by
the Secretary or an Assistant Secretary of the Company or any Guarantor,  as the
case may be, 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.

                  "Book-Entry  Note" means any Global  Notes  bearing the legend
specified  in  Section  2.02  evidencing  all or  part  of a  series  of  Notes,
authenticated  and delivered to the  Depositary  for such series or its nominee,
and registered in the name of such Depositary or nominee.

                  "Business Day" means each Monday, Tuesday, Wednesday, Thursday
and Friday which is not a day on which banking  institutions  or trust companies
in The City of New York or the city in which the  Corporate  Trust Office of the
Trustee is located are  authorized or obligated by law,  regulation or executive
order to close.

                  "Capital Lease  Obligation" of any Person means any obligation
of such Person and its  subsidiaries  on a Consolidated  basis under any capital
lease of real or personal  property  which,  in accordance  with GAAP,  has been
recorded as a capital lease obligation.

                  "Capital Stock" means (i) with respect to any Person that is a
corporation, any and all shares, interests,  participations or other equivalents
(however  designated  and whether or not voting) of corporate  stock,  including
each  class of common  stock and  preferred  stock of such  Person and (ii) with
respect  to any  Person  that is not a  corporation,  any  and all  partnership,
membership or other equity interests of such Person.

                  "Cash  Equivalents"  means (i) any  evidence of  Indebtedness,
maturing  not more than one year  after the date of  acquisition,  issued by the
United  States  of  America,  or  an  instrumentality  or  agency  thereof,  and
guaranteed  fully as to principal,  premium,  if any, and interest by the United
States of America,  (ii) any certificate of deposit,  maturing not more than one
year after the date of acquisition,  issued by, or time deposit of, a commercial
banking  institution that is a member of the Federal Reserve System and that has
combined  capital  and  surplus  and  undivided  profits  of not less  than $500
million,  whose  short  term  debt has a  rating,  at the  time as of which  any
investment  therein is made, of "P-1" (or higher) according to Moody's Investors
Service,  Inc.  ("Moody's") or any successor  rating agency or "A-1" (or higher)
according  to  Standard & Poor's  Corporation  ("S&P") or any  successor  rating
agency,




                                 Page 14 of 162
<PAGE>

(iii)  commercial  paper,  maturing  not more  than 270 days  after  the date of
acquisition,  issued by a corporation  (other than an Affiliate or Subsidiary of
the  Company)  organized  and  existing  under the laws of the United  States of
America with a rating,  at the time as of which any investment  therein is made,
of "P-1" (or higher)  according to Moody's or "A-1" (or higher) according to S&P
and (iv) any money  market  deposit  accounts  issued or  offered  by a domestic
commercial  bank having capital and surplus in excess of $500 million;  provided
that the short term debt of such  commercial  bank has a rating,  at the time of
Investment,  of "P-1" (or  higher)  according  to Moody's  or "A-1" (or  higher)
according to S&P.

                  "Change  of  Control"  means  the  occurrence  of  any  of the
following  events:  (i) any  "person"  or  "group"  (as such  terms  are used in
Sections  13(d) and 14(d) of the  Exchange  Act) is or becomes  the  "beneficial
owner" (as defined in Rules 13d-3 and 13d-5 under the Exchange Act,  except that
a Person  shall be deemed to have  beneficial  ownership of all shares that such
Person has the right to acquire,  whether such right is exercisable  immediately
or only after the passage of time), directly or indirectly,  of more than 50% of
the total  outstanding  Voting  Stock of the Company  (other  than IXC  Internet
Services, Inc., IXC Communications, Inc. or any controlled affiliate thereof, in
any case  pursuant to the issuance by the Company of shares of Capital  Stock in
satisfaction  of any  obligations  under the terms of the IXC  Agreement);  (ii)
during any period of two consecutive years,  individuals who at the beginning of
such period constituted the Board of Directors of the Company (together with any
new directors  whose election to such board or whose  nomination for election by
the  stockholders  of the  Company  was  approved by a vote of a majority of the
directors  then still in office who were 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 such  Board of
Directors then in office;  (iii) the Company consolidates with or merges with or
into any Person or conveys,  transfers or leases all or substantially all of its
assets to any Person,  or any  corporation  consolidates  with or merges into or
with the  Company  in any such  event  pursuant  to a  transaction  in which the
outstanding  Voting Stock of the Company is changed into or exchanged  for cash,
securities  or  other  property,  other  than  any such  transaction  where  the
outstanding  Voting  Stock of the  Company is not  changed or  exchanged  at all
(except  to the extent  necessary  to  reflect a change in the  jurisdiction  of
incorporation  of the Company or where no "person" or "group" owns,  immediately
after  such  transaction,  directly  or  indirectly,  more than 50% of the total
outstanding Voting Stock of the surviving  corporation);  or (iv) the Company is
liquidated or dissolved or adopts a plan of  liquidation  or  dissolution  other
than in a transaction which complies with the provisions described under Section
8.01.  The good  faith  determination  of the  Board,  based  upon the advice of
outside counsel, of the beneficial ownership of securities of the Company within
the meaning of Rules 13d-3 and 13d-5 under the Exchange Act shall be conclusive,
absent   contrary   controlling   judicial   precedent   on   contrary   written
interpretation published by the Commission.

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

                  "Collateral" has the meaning provided in the Escrow Agreement.

                  "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.

                  "Commodity  Price  Protection  Agreement"  means  any  forward
contract,  commodity swap, commodity option or other similar financial agreement
or arrangement  relating to, or the value which is dependent upon,  fluctuations
in commodity prices.

                  "Common Stock" means the common stock, par value $0.01 per 
share, of the Company.


                                 Page 15 of 162
<PAGE>


                  "Company" means PSINet Inc., a corporation  incorporated under
the laws of New York,  until a successor  Person shall have become such pursuant
to the applicable  provisions of this Indenture,  and thereafter "Company" shall
mean such successor Person.

                  "Company  Request" or "Company  Order" means a written request
or order  signed in the name of the  Company by any one of its  Chairman  of the
Board, its President,  its Chief Executive Officer,  its Chief Financial Officer
or a Vice President  (regardless of Vice Presidential  designation),  and by any
one of its  Treasurer,  an Assistant  Treasurer,  its  Secretary or an Assistant
Secretary, and delivered to the Trustee.

                  "Company Rights Agreement" means the Rights  Agreement,  dated
as of May 8, 1996,  between the Company and First  Chicago  Trust Company of New
York,  as in effect on the date of the  Indenture  (or as amended,  from time to
time,  to the extent that such  amendment  has been  determined  by the Board of
Directors, in good faith, not to adversely affect the holders of the Notes).

                  "Consolidated" means consolidated in accordance with GAAP.

                  "Consolidated Income Tax Expense" of any Person means, for any
period, the provision for federal, state, local and foreign income taxes of such
Person  and its  Consolidated  subsidiaries  for such  period as  determined  in
accordance with GAAP.

                  "Consolidated  Interest Expense" of any Person means,  without
duplication,  for any period, the sum of (a) the interest expense of such Person
and its  subsidiaries  for such  period,  on a  Consolidated  basis,  including,
without  limitation,  (i)  amortization  of debt  discount,  (ii) the net  costs
associated  with Interest  Rate  Agreements,  Currency  Hedging  Agreements  and
Commodity Price  Protection  Agreements  (including  amortization of discounts),
(iii) the interest portion of any deferred  payment  obligation and (iv) accrued
interest,  plus (b) (i) the interest  component of the Capital Lease Obligations
paid,  accrued  and/or  scheduled  to be paid or accrued by such  Person and its
subsidiaries during such period and (ii) all capitalized interest of such Person
and its subsidiaries  plus (c) the interest expense actually paid by such Person
under any  Guaranteed  Debt of such Person and any  subsidiary to the extent not
included  under clause  (a)(iv)  above,  plus (d) the aggregate  amount for such
period  of cash  or  non-cash  dividends  on any  Redeemable  Capital  Stock  or
Preferred Stock of the Company and its Subsidiaries,  in each case as determined
on a Consolidated basis in accordance with GAAP.

                  "Consolidated  Net Income" means,  with respect to any period,
the net income of the Company and any Subsidiary for such period determined on a
consolidated basis in accordance with GAAP, adjusted,  to the extent included in
calculating  such  net  income,  by  excluding,  without  duplication,  (a)  all
extraordinary  gains or losses for such period, (b) all gains or losses from the
sales or other  dispositions  of assets out of the  ordinary  course of business
(net of  taxes,  fees and  expenses  relating  to the  transaction  giving  rise
thereto) for such period: (c) that portion of such net income derived from or in
respect of investments in Persons other than Subsidiaries,  except to the extent
actually received in cash by the Company or any Subsidiary (subject, in the case
of any Subsidiary, to the provisions of clause (f) of this definition);  (d) the
portion of such net income (or loss)  allocable  to  minority  interests  in any
Person  (other  than a  Subsidiary)  for such  period,  except to the extent the
Company's  allocation  portion of such  Person's  net income for such  period is
actually received in cash by the Company or any Subsidiary (subject, in the case
of any Subsidiary, to the provisions of clause (f) of this definition);  (e) the
net  income  (or loss) of any other  Person  combined  with the  Company  or any
Subsidiary on a "pooling of interests" basis attributable to any period prior to
the date of combination;  and (f) the net income of any Subsidiary to the extent
that the declaration of dividends or similar distributions by that Subsidiary of
that income is not at the time (regardless of any waiver) permitted, directly or
indirectly,  by  operation  of the  terms  of  its




                                 Page 16 of 162
<PAGE>

charter or any agreement,  instrument, judgment, decree, order, statute, rule or
governmental  regulations  applicable  to that  Subsidiary  or its Capital Stock
holders.

                  "Consolidated  Operating Cash Flow" means, with respect to any
period, Consolidated Net Income for such period increased (without duplication),
to the extent  deducted in  calculating  such  Consolidated  Net Income,  by (a)
Consolidated  Income Tax  Expense for such  period;  (b)  Consolidated  Interest
Expense  for such  period;  and (c)  depreciation,  amortization  and any  other
non-cash  items for such period (other than any non-cash item which requires the
accrual of, or a reserve for, cash charges for any future period) of the Company
and any Subsidiary,  including, without limitation,  amortization of capitalized
debt  issuance  costs for such  period,  all of the  foregoing  determined  on a
consolidated  basis in accordance  with GAAP minus  non-cash items to the extent
they increase  Consolidated Net Income (including the partial or entire reversal
of reserves taken in prior periods) for such period.

                  "Corporate Trust Office" means the office of the Trustee or an
affiliate or agent thereof at which at any particular  time the corporate  trust
business for the purposes of this Indenture  shall be principally  administered,
which  office at the date of  execution  of this  Indenture is located at Rodney
Square North, 1100 North Market Street, Wilmington, Delaware 19890-0001.

                  "Cumulative  Operating  Cash  Flow"  means,  as at any date of
determination, the positive cumulative Consolidated Operating Cash Flow realized
during the period  commencing on the original issue date of the Notes and ending
on the last day of the most recent fiscal quarter immediately preceding the date
of determination for which consolidated  financial information of the Company is
available  or,  if such  cumulative  Consolidated  Operating  Cash Flow for such
period  is  negative,  the  negative  amount  by which  cumulative  Consolidated
Operating Cash Flow is less than zero.

                  "Currency  Hedging  Arrangements"  means  one or  more  of the
following  agreements  which  shall  be  entered  into by one or more  financial
institutions:  foreign  exchange  contracts,  currency swap  agreements or other
similar agreements or arrangements  designed to protect against the fluctuations
in currency values.

                  "Debt  Securities"  means  any debt  securities  issued by the
Company in a public offering or private placement.

                  "Debt to Annualized Operating Cash Flow Ratio" means the ratio
of (a) the Total  Consolidated  Indebtedness as of the date of calculation  (the
"Determination Date") to (b) four times the Consolidated Operating Cash Flow for
the  latest  fiscal  quarter  for  which  financial   information  is  available
immediately  preceding such Determination Date (the "Measurement  Period").  For
purposes of calculating  Consolidated  Operating  Cash Flow for the  Measurement
Period immediately prior to the relevant Determination Date, (i) any Person that
is a Subsidiary on the Determination  Date (or would become a Subsidiary on such
Determination  Date  in  connection  with  the  transaction  that  requires  the
determination of such  Consolidated  Operating Cash Flow) will be deemed to have
been a Subsidiary at all times during such Measurement  Period,  (ii) any Person
that is not a  Subsidiary  on such  Determination  Date (or would  cease to be a
Subsidiary on such  Determination  Date in connection with the transaction  that
requires the  determination  of such  Consolidated  Operating Cash Flow) will be
deemed not to have been a Subsidiary at any time during such Measurement Period,
and (iii) if the Company or any Subsidiary shall have in any manner (x) acquired
(through an  Acquisition or the  commencement  of activities  constituting  such
operating  business) or (y) disposed of (by an Asset Sale or the  termination or
discontinuance of activities constituting such operating business) any operating
business during such  Measurement  Period or after the end of such period and on
or prior to such  Determination  Date,  such  calculation  will be made on a pro
forma basis in accordance  with GAAP as if, in the case of an Acquisition or the
commencement  of  activities  constituting  such  operating  business,  all such
transactions  


                                 Page 17 of 162
<PAGE>

had been consummated prior to the first day of such Measurement Period (it being
understood that in calculating  Consolidated  Operating Cash Flow the exclusions
set forth in clauses (a)  through  (f) of the  definition  of  Consolidated  Net
Income shall apply to an Acquired Person as if it were a Subsidiary).

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

                  "Depositary"  means,  with  respect to the Notes issued in the
form of one or more Book-Entry Notes, The Depositary Trust Company ("DTC"),  its
nominees and  successors,  or another  Person  designated  as  Depositary by the
Company, which must be a clearing agency registered under the Exchange Act.

                  "Disinterested   Director"   means,   with   respect   to  any
transaction  or  series  of  related  transactions,  a  member  of the  Board of
Directors  of the  Company  who does not have any  material  direct or  indirect
financial  interest in or with respect to such  transaction or series of related
transactions.

                  "Disqualified  Stock" means,  with respect to any person,  any
Capital Stock 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 becomes  mandatorily  redeemable,  pursuant to a sinking fund
obligation or otherwise,  or becomes exchangeable for Indebtedness at the option
of the  holder  thereof,  or  becomes  redeemable  at the  option of the  holder
thereof,  in whole or in part,  on or prior to the  final  maturity  date of the
Notes;  provided such Capital Stock shall only constitute  Disqualified Stock to
the extent it so matures or becomes so redeemable or exchangeable on or prior to
the final maturity date of the Notes; provided,  further, that any Capital Stock
that would not constitute  Disqualified  Stock but for provisions thereof giving
holders  thereof the right to require such person to  repurchase  or redeem such
Capital  Stock upon the  occurrence  of an "asset  sale" or "change of  control"
occurring  prior to the final  maturity  date of the Notes shall not  constitute
Disqualified  Stock  if the  "asset  sale" or  "change  of  control"  provisions
applicable  to such Capital  Stock are no more  favorable to the holders of such
Capital Stock than the  provisions  contained in Section 10.12 and Section 10.14
and  such  Capital  Stock  specifically  provides  that  such  person  will  not
repurchase  or redeem any such stock  pursuant  to such  provision  prior to the
Company's repurchase of such Notes as are required to be repurchased pursuant to
Section 10.12 and Section 10.14.

                  "Escrow  Account"  means  the  "Interest  Escrow  Account"  as
defined in the Escrow Agreement.

                  "Escrow Agent" means Wilmington Trust Company, as escrow agent
under the Escrow Agreement and includes any subcustodian appointed by Wilmington
Trust  Company  under the Escrow  Agreement,  until a  successor  replaces it in
accordance with the provisions of the Escrow Agreement and thereafter means such
successor.

                  "Escrow  Agreement"  means the Interest Escrow Agreement dated
as of April 13, 1998 among the Company, the Escrow Agent and the Trustee.

                  "Escrow  Funds"  has  the  meaning  specified  in  the  Escrow
Agreement.

                  "Event of Default" has the meaning specified in Section 5.01.

                  "Exchange Act" means the  Securities  Exchange Act of 1934, as
amended, or any successor statute.

                                 Page 18 of 162
<PAGE>


                  "Exchange  Offer" means the  exchange  offer by the Company of
Series B Notes for Series A Notes to be effected  pursuant  to the  Registration
Rights Agreement.

                  "Exchange  Offer  Registration  Statement" has the meaning set
forth in the Registration Rights Agreement.

                  "Fair  Market  Value"  means,  with  respect  to any  asset or
property,  the sale value that would be reasonably expected to be obtained in an
arm's-length  transaction  between  an  informed  and  willing  seller  under no
compulsion to sell and an informed and willing buyer under no compulsion to buy.
Fair Market Value shall be  determined  by the Board of Directors of the Company
acting in good faith and shall be evidenced by a Board Resolution.

                  "Generally  Accepted  Accounting  Principles"  or "GAAP" means
generally  accepted  accounting  principles in the United  States,  consistently
applied, which are in effect on the date hereof.

                  "Global   Notes"  means  the  Rule  144A  Global  Notes,   the
Regulation  S  Global  Notes  and the  Series B Global  Notes  to be  issued  as
Book-Entry Notes issued to the Depositary in accordance with Section 3.06.

                  "Guarantee"  means  the  guarantee  by  any  Guarantor  of the
Company's Indenture Obligations.

                  "Guaranteed  Debt" of any Person means,  without  duplication,
all  Indebtedness of any other Person  guaranteed  directly or indirectly in any
manner by such Person,  or in effect  guaranteed  directly or indirectly by such
Person  through an  agreement  (i) to pay or purchase  such  Indebtedness  or to
advance or supply funds for the payment or purchase of such  Indebtedness,  (ii)
to  purchase,  sell or lease (as lessee or lessor)  property,  or to purchase or
sell services,  primarily for the purpose of enabling the debtor to make payment
of such Indebtedness or to assure the holder of such Indebtedness  against loss,
(iii) to  supply  funds  to,  or in any  other  manner  invest  in,  the  debtor
(including any agreement to pay for property or services without  requiring that
such  property  be  received or such  services  be  rendered),  (iv) to maintain
working  capital or equity  capital of the debtor,  or otherwise to maintain the
net worth,  solvency or other financial condition of the debtor or (v) otherwise
to assure a creditor against loss;  provided that the term "guarantee" shall not
include  endorsements for collection or deposit,  in either case in the ordinary
course of business.

                  "Guarantor"  means any Subsidiary  which is a guarantor of the
Notes,  including any Person that is required after the date hereof to execute a
guarantee of the Notes pursuant to Section 10.13 until a successor replaces such
party pursuant to the applicable  provisions of this Indenture and,  thereafter,
shall mean such successor.

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

                  "Incur"  means,  with  respect  to any  Indebtedness  or other
obligation of any Person,  to create,  issue,  incur  (including by  conversion,
exchange or otherwise),  assume, guarantee or otherwise become liable in respect
of such Indebtedness or other obligation or the recording,  as required pursuant
to GAAP or  otherwise,  of any  such  Indebtedness  or other  obligation  on the
balance sheet of such Person (and "Incurrence", "Incurred" and "Incurring" shall
have meanings  correlative to the foregoing).  Indebtedness of a Person existing
at the time such Person becomes a Subsidiary or is merged or  consolidated  with
or into the  Company or any  Subsidiary  shall be deemed to be  Incurred at such
time.

                                 Page 19 of 162
<PAGE>


                  "Indebtedness"  means,  with  respect to any  Person,  without
duplication,  (i) all  indebtedness of such Person for borrowed money or for the
deferred  purchase  price of property or services,  excluding any trade payables
and  other  accrued  current  liabilities  arising  in the  ordinary  course  of
business,  (ii) all  obligations  of such  Person  evidenced  by  bonds,  notes,
debentures  or other  similar  instruments,  (iii) all  indebtedness  created or
arising  under any  conditional  sale or other title  retention  agreement  with
respect to property  acquired by such Person  (unless the rights and remedies of
the seller or lender under such agreement in the event of default are limited to
repossession or sale of such property),  but excluding trade payables arising in
the ordinary  course of  business,  (iv) all  obligations  under  Interest  Rate
Agreements, Currency Hedging Agreements or Commodity Price Protection Agreements
of such Person,  (v) all Capital  Lease  Obligations  of such  Person,  (vi) all
Indebtedness  referred to in clauses (i) through (v) above of other  Persons and
all  dividends  of other  Persons,  the payment of which is  guaranteed  by such
Person  or which is  otherwise  secured  by (or for  which  the  holder  of such
Indebtedness has an existing right,  contingent or otherwise,  to be secured by)
any Lien,  upon or with  respect to  property  (including,  without  limitation,
accounts and contract rights) owned by such Person,  even though such Person has
not  directly  assumed or become  liable for the  payment of such  Indebtedness,
(vii) all  Redeemable  Capital Stock issued by such Person valued at the greater
of its voluntary or involuntary  maximum fixed repurchase price plus accrued and
unpaid  dividends,  and (viii) any  refinancing  of any  liability  of the types
referred  to in clauses  (i) through  (vii)  above.  For  purposes  hereof,  the
"maximum fixed repurchase price" of any Redeemable  Capital Stock which does not
have a fixed  repurchase  price shall be calculated in accordance with the terms
of such  Redeemable  Capital  Stock as if such  Redeemable  Capital  Stock  were
purchased on any date on which  Indebtedness  shall be required to be determined
pursuant to this Indenture, and if such price is based upon, or measured by, the
Fair Market Value of such Redeemable Capital Stock, such Fair Market Value to be
determined  in good  faith  by the  Board of  Directors  of the  issuer  of such
Redeemable  Capital Stock.  In no event shall  "Indebtedness"  include any trade
payable or other current liabilities arising in the ordinary course of business.
The amount of any item of Indebtedness  shall be the amount of such Indebtedness
properly  classified  as a liability on a balance  sheet  prepared in accordance
with GAAP.

                  "Indenture"  means  this  instrument  as  originally  executed
(including  all exhibits and schedules  thereto) 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.

                  "Indenture  Obligations"  means the obligations of the Company
and any other  obligor  under this  Indenture or under the Notes,  including any
Guarantor,  to pay  principal  of,  premium,  if any, and interest  when due and
payable,  and all other amounts due or to become due under or in connection with
this Indenture,  the Notes and the  performance of all other  obligations to the
Trustee and the holders  under this  Indenture  and the Notes,  according to the
respective terms thereof.

                  "Initial  Purchasers"  means  Donaldson,   Lufkin  &  Jenrette
Securities  Corporation,  Merrill Lynch, Pierce, Fenner & Smith Incorporated and
Chase Securities Inc.

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

                  "Interest Rate Agreements"  means one or more of the following
agreements  which shall be entered into by one or more  financial  institutions:
interest rate protection  agreements  (including,  without limitation,  interest
rate swaps, caps, floors,  collars and similar agreements) and/or other types of
interest rate hedging agreements from time to time.

                  "Investment"  means,  with respect to any Person,  directly or
indirectly,  any advance,  loan  (including  guarantees),  or other extension of
credit or capital contribution to (by means of any transfer of



                                 Page 20 of 162
<PAGE>

cash or other property to others or any payment for property or services for the
account or use of others),  or any  purchase,  acquisition  or ownership by such
Person of any Capital Stock, bonds, notes, debentures or other securities issued
or owned by any other  Person and all other  items that would be  classified  as
investments on a balance sheet prepared in accordance with GAAP.

                  "Issue Date" means the date on which the Notes are  originally
issued under this Indenture.

                  "IXC"  means  IXC   Internet   Services,   Inc.,   a  Delaware
corporation, and any successors or assigns under the IXC Agreement.

                  "IXC  Agreement"  means the IRU and Stock Purchase  Agreement,
dated as of July 22, 1997, between the Company and IXC, as amended,  pursuant to
which the Company acquired from IXC 20-year  noncancellable  indefeasible rights
of use, as in effect on the date of the  Indenture  (or as further  amended from
time to time, to the extent that such amendment has been determined by the Board
of Directors, in good faith, not to adversely affect the Holders of the Notes).

                  "Lien"  means  any  mortgage  or deed of trust,  pledge,  lien
(statutory or otherwise), security interest, hypothecation, or other encumbrance
upon or with respect to any property of any kind,  real or personal,  movable or
immovable,  now owned or  hereafter  acquired.  A Person  shall be deemed to own
subject to a Lien any property  which such Person has acquired or holds  subject
to the  interest of a vendor or lessor  under any  conditional  sale  agreement,
capital  lease or other  title  retention  agreement,  other  than (i) any lease
properly classified as an operating lease under GAAP, (ii) intellectual property
licensing   arrangements,   or  (iii)  cancellation  or  termination  rights  or
provisions  contained in agreements  governing any indefeasible rights of use or
similar  property rights which do not materially  impair the use of the property
or interest which is the subject of such  cancellation or termination  rights or
provisions.

                  "Liquidated  Damages" has the meaning provided in Section 5 of
the Registration Rights Agreement.

                  "Maturity"  means,  when used with  respect to the Notes,  the
date on which the  principal  of the Notes  becomes  due and  payable as therein
provided or as provided in this Indenture, whether at Stated Maturity, the Offer
Date or the redemption date and whether by declaration of acceleration, Offer in
respect of Excess  Proceeds,  Change of Control  Offer in respect of a Change of
Control, call for redemption or otherwise.

                  "Moody's"  means  Moody's  Investors  Service,  Inc.,  or  any
successor rating agency.

                  "Net Cash  Proceeds"  means (a) with respect to any Asset Sale
by any Person, the proceeds thereof (without duplication in respect of all Asset
Sales) in the form of cash or Cash Equivalents  including payments in respect of
deferred  payment  obligations  when  received in the form of, or stock or other
assets when disposed of for, cash or Cash Equivalents (except to the extent that
such  obligations  are  financed  or sold with  recourse  to the  Company or any
Wholly-Owned  Subsidiary)  net of (i) brokerage  commissions  and other fees and
expenses (including fees and expenses of counsel and investment bankers) related
to such Asset Sale,  (ii)  provisions  for all taxes payable as a result of such
Asset Sale,  (iii)  payments made to retire  Indebtedness  where payment of such
Indebtedness  is secured by the assets or  properties  the subject of such Asset
Sale, (iv) amounts  required to be paid to any Person (other than the Company or
any Subsidiary) owning a beneficial  interest in the assets subject to the Asset
Sale and (v)  amounts  contractually  required  to be  deposited  into escrow or
similar trust  arrangements and other appropriate  amounts to be provided by the
Company or any Subsidiary,  as the case may be, as a reserve, in accordance with
GAAP,  against any  liabilities  associated with such Asset Sale and retained by


                                 Page 21 of 162
<PAGE>

the  Company or any  Subsidiary,  as the case may be,  after  such  Asset  Sale,
including,  without  limitation,   pension  and  other  post-employment  benefit
liabilities,  liabilities related to environmental matters and liabilities under
any indemnification obligations associated with such Asset Sale or reimbursement
obligations related to letters of credit issued against  liabilities  associated
therewith, all as reflected in an officers' certificate delivered to the Trustee
(which  amounts  shall  become Net Cash  Proceeds  only at such time as they are
released  from  escrow  or such  trust  arrangements  or  otherwise  cease to be
reserved or subject to other  obligations to third parties) and (b) with respect
to any  issuance  or sale of Capital  Stock or  options,  warrants  or rights to
purchase  Capital  Stock,  or debt  securities  or Capital  Stock that have been
converted  into or exchanged for Capital Stock as referred to in Section  10.09,
the  proceeds of such  issuance or sale in the form of cash or Cash  Equivalents
including  payments in respect of deferred payment  obligations when received in
the  form  of,  or stock or other  assets  when  disposed  of for,  cash or Cash
Equivalents  (except to the extent that such  obligations  are  financed or sold
with  recourse  to the  Company  or any  Subsidiary),  net of  attorney's  fees,
accountant's fees and brokerage,  consultation,  underwriting and other fees and
expenses  actually  incurred  in  connection  with  such  issuance  or sale  (or
conversion  in the case of debt  securities  or  Capital  Stock  that  have been
converted) and net of taxes paid or payable as a result thereof.

                  "Non-U.S.  Person" means a Person that is not a "U.S.  Person"
as defined in Regulation S under the Securities Act.

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

                  "Officers'  Certificate"  means a  certificate  signed  by the
Chairman of the Board,  the President,  the Chief Executive  Officer,  the Chief
Financial  Officer  or  a  Vice  President   (regardless  of  Vice  Presidential
designation),  and by the Treasurer, an Assistant Treasurer, the Secretary or an
Assistant Secretary, of the Company or any Guarantor, as the case may be, and in
form and substance reasonably satisfactory to, and delivered to, the Trustee.

                  "Opinion of Counsel" means a written  opinion of counsel,  who
may be counsel for the Company, any Guarantor or the Trustee,  unless an Opinion
of Independent Counsel is required pursuant to the terms of this Indenture,  and
who shall be reasonably acceptable to the Trustee, and which opinion shall be in
form and substance reasonably satisfactory to the Trustee.

                   "Opinion of Independent  Counsel" means a written  opinion of
counsel, who may be regular outside counsel for the Company, but which is issued
by a Person who is not an employee or consultant (other than non-employee  legal
counsel) of the Company, or any Guarantor and who shall be reasonably acceptable
to the Trustee,  and which  opinion  shall be in form and  substance  reasonably
satisfactory to the Trustee.

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

                  (a)      Notes  theretofore  canceled   by   the   Trustee  or
delivered to the Trustee for cancellation;

                  (b)      Notes,  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  Notes;  provided  that if such Notes are to be
redeemed,  notice  of such  redemption  has been  duly  given  pursuant  to this
Indenture or provision therefor reasonably  satisfactory to the Trustee has been
made;

                                 Page 22 of 162
<PAGE>


                  (c)      Notes, except to the extent provided in Sections 4.02
and 4.03, with respect to which the Company has effected  defeasance or covenant
defeasance as provided in Article IV; and

                  (d)      Notes in exchange for or in lieu of which other Notes
have been authenticated and delivered pursuant to this Indenture, other than any
such Notes in respect of which  there shall have been  presented  to the Trustee
and the Company proof  reasonably  satisfactory  to each of them that such Notes
are held by a bona fide purchaser in whose hands the Notes are valid obligations
of the Company;  provided,  however,  that in determining whether the Holders of
the  requisite  principal  amount of  Outstanding  Notes have given any request,
demand,  authorization,  direction,  notice, consent or waiver hereunder,  Notes
owned by the Company, any Guarantor,  or any other obligor upon the Notes or any
Affiliate  of the  Company,  any  Guarantor  or  such  other  obligor  shall  be
disregarded  and deemed  not to be  Outstanding,  except  that,  in  determining
whether the Trustee shall be protected in relying upon any such request, demand,
authorization,  direction,  notice,  consent  or waiver,  only  Notes  which the
Trustee knows to be so owned shall be so disregarded.  Notes so owned which have
been  pledged  in good  faith may be  regarded  as  Outstanding  if the  pledgee
establishes to the reasonable satisfaction of the Trustee the pledgee's right so
to act with respect to such Notes and that the pledgee is not the  Company,  any
Guarantor or any other  obligor upon the Notes or any  Affiliate of the Company,
any Guarantor or such other obligor.

                  "Pari Passu  Indebtedness"  means (a) any  Indebtedness of the
Company  which  ranks  pari  passu in right of payment to the Notes and (b) with
respect  to any  Guarantee,  Indebtedness  which  ranks  pari  passu in right of
payment to such Guarantee.

                  "Paying  Agent"  means  any  Person  (including  the  Company)
authorized by the Company to pay the principal of, premium,  if any, or interest
on, any Notes on behalf of the Company.

                  "Permitted   Credit   Facility"   means   any   unsubordinated
commercial term loan and/or  revolving  credit facility entered into principally
with  commercial  banks and/or other financial  institutions  typically party to
commercial loan agreements and any refinancing thereof.

                  "Permitted   Investment"   means   (i)   Investments   in  any
Wholly-Owned  Subsidiary or any Person  which,  as a result of, or in connection
with, such Investment, (a) becomes a Wholly-Owned Subsidiary or (b) is merged or
consolidated  with or into, or transfers or conveys all or substantially  all of
its  assets  to,  or  is  liquidated  into,  the  Company  or  any  Wholly-Owned
Subsidiary;  (ii)  Indebtedness  of the Company or a Subsidiary  described under
clauses (iv) and (vii) of paragraph (b) of Section 10.08;  (iii)  Investments in
any of the Notes; (iv) Investments in Cash Equivalents; (v) Investments acquired
by the Company or any  Subsidiary  in  connection  with an Asset Sale  permitted
under  Section  10.12 to the extent such  Investments  are non-cash  proceeds as
permitted under such covenant;  (vi)  Investments in existence or  contractually
committed to on the date of the Indenture  and any  extension,  modification  or
renewal  of any such  Investment  that  does not  increase  the  amount  of such
Investment;  (vii) guarantees of Indebtedness of a Wholly-Owned Subsidiary given
by the Company or another Wholly-Owned Subsidiary and guarantees of Indebtedness
of the Company given by any Subsidiary, in each case, not otherwise in violation
of the terms of the Indenture;  (viii)  advances to employees or officers of the
Company in the ordinary  course of business so long as the  aggregate  amount of
such advances shall not exceed $2 million  outstanding at any one time; (ix) any
Investment in the Company by any Subsidiary of the Company;  provided,  that any
such Investment in the form of Indebtedness shall be Subordinated  Indebtedness;
(x) accounts  receivable  created or acquired in the ordinary course of business
of the Company or any Subsidiary and  Investments  arising from  transactions by
the Company or any Subsidiary  with trade creditors or customers in the ordinary
course of business  (including any such Investment received pursuant to any plan
of  reorganization  or  similar  arrangement   pursuant  to  the  bankruptcy  or
insolvency of such trade  creditors or customers or otherwise in settlement of a
claim); (xi) loans in the 



                                 Page 23 of 162
<PAGE>

ordinary  course of business to employees,  officers or directors of the Company
or a Subsidiary to purchase  Capital Stock of the Company  pursuant to the terms
of stock benefit plans;  (xii) Investments the consideration of which is Capital
Stock of the Company;  (xiii) Investments in or acquisitions of Capital Stock or
other  obligations,  property or securities of Persons  (other than  Affiliates)
received in the bankruptcy or  reorganization  of or by such Person or otherwise
taken in settlement or  satisfaction of claims,  disputes or judgments,  and, in
each case, extensions,  modifications and renewals thereof; (xiv) Investments in
prepaid expenses, negotiable instruments held for collection, and lease, utility
and  workers'  compensation,   performance  and  other  similar  deposits;  (xv)
Investments,  not to exceed $100 Million at any one time outstanding,  to obtain
noncancellable  indefeasible  rights  of use to,  or  capacity  in,  fiber-based
bandwidth  (or  similar  network  bandwidth),  related  equipment  and/or  other
Telecommunications  Assets in the ordinary course of the Company's business; and
(xvi) any other  Investments in an aggregate amount not to exceed $50 million at
any one time outstanding.  In connection with any assets or property contributed
or transferred to any Person as an Investment, such property and assets shall be
equal  to the  Fair  Market  Value  (as  determined  by the  Company's  Board of
Directors) at the time of such Investment.

                  "Permitted Joint Venture" means a corporation,  partnership or
other Person  engaged in a  Telecommunications  Business  over which the Company
has,  directly or indirectly,  the power to direct the policies,  management and
affairs in all material respects.

                  "Permitted Lien" means:

                  (a)      any Lien existing as of the date of this Indenture;

                  (b)      any  Lien  arising  by  reason of  (I) any  judgment,
decree or order of any court, so long as such Lien is adequately  bonded and any
appropriate  legal proceedings which may have been duly initiated for the review
of such judgment,  decree or order shall not have been finally terminated or the
period within which such  proceedings  may be initiated  shall not have expired;
(II) taxes not yet delinquent or which are being contested in good faith;  (III)
security  for payment of workers'  compensation  or other  insurance  or arising
under  worker's  compensation  laws or  similar  legislation;  (IV)  good  faith
deposits  in  connection  with bids,  tenders,  leases,  contracts  (other  than
contracts  evidencing   Indebtedness);   (V)  zoning  restrictions,   easements,
licenses,  reservations,  title  defects,  rights of others  for  rights of way,
utilities,  sewers,  electric  lines,  telephone or telegraph  lines,  and other
similar purposes, provisions,  covenants,  conditions,  waivers, restrictions on
the use of property or  irregularities  of title (and with  respect to leasehold
interests,  mortgages,  obligations,  liens  and  other  encumbrances  incurred,
created,  assumed  or  permitted  to exist and  arising  by,  through or under a
landlord  or  owner of the  leased  property,  with or  without  consent  of the
lessee),  none of which  materially  impairs  the use of any parcel of  property
material to the  operation of the business of the Company or any  Subsidiary  or
the value of such  property for the purpose of such  business;  (VI) deposits to
secure public or statutory obligations, or in lieu of surety or appeal bonds; or
(VII) operation of law in favor of landlords, carriers,  warehousemen,  bankers,
mechanics,  materialmen,  laborers,  employees  or  suppliers,  incurred  in the
ordinary  course of business for sums which are not yet  delinquent or are being
contested in good faith by  negotiations  or by  appropriate  proceedings  which
suspend the collection thereof;

                  (c)      any  Lien  to secure  the  performance  bids,   trade
contracts,  leases  (including,  without  limitation,  statutory  and common law
landlord's liens),  statutory  obligations,  surety and appeal bonds, letters of
credit and other  obligations  of a like  nature and  incurred  in the  ordinary
course of business of the Company or any Subsidiary;

                  (d)      any  Lien  securing  obligations in connection   with
Indebtedness  permitted under clause (i) of paragraph (b) of Section 10.08 which
are  incurred or assumed in  connection  with the



                                 Page 24 of 162
<PAGE>

acquisition,  development  or  construction  of real or  personal,  moveable  or
immovable  property within 180 days of such  incurrence or assumption;  provided
that such Liens only extend to such acquired,  developed or constructed property
and any accessories,  accessions,  additions, replacements and proceeds thereof;
and

                  (e)      any    Lien   arising   from   judgments,  decrees or
attachments in  circumstances  not  constituting  an Event of Default;

                  (f)      any  Lien securing   obligations   in connection with
Indebtedness  permitted  in clauses  (ii),  (iv) or (viii) of  paragraph  (b) of
Section 10.08;

                  (g)      any Lien in favor of the Company or  any Wholly-Owned
Subsidiary;

                  (h)      any  Lien  securing  obligations in  connection  with
Acquired  Indebtedness;  provided that any such Lien does not extend to or cover
any property or assets of the Company or any of its Subsidiaries  other than the
property or assets of the Acquired Person covered thereby or the property assets
so acquired;

                  (i)      any Lien in favor of the  Trustee  for the benefit of
the Holders or the Trustee  arising under the provisions in the Indenture or the
Escrow Agreement;

                  (j)      any    Lien   encumbering  deposits   made  to secure
obligations  arising  from  statutory,   regulatory,   contractual  or  warranty
requirements  of the Company or any  Subsidiary if and to the extent  arising in
the ordinary course of business, including rights of offset and set-off;

                  (k)      any Lien in favor of  customs or  revenue authorities
to secure payment of customs duties in connection  with the importation of goods
in the ordinary course of business;

                  (l)      leases,  subleases,  licenses or other similar rights
granted to third Persons not interfering with the ordinary course of business of
the Company or its Subsidiaries;

                  (m)      any   Lien securing  reimbursement  obligations  with
respect to letters of credit that encumber documents and other property relating
to such letters of credit.

                  (n)      any Lien  securing any  refinancing, in  whole  or in
part, of any obligation or Indebtedness  described in the foregoing  clauses (a)
through (d) and (f) through (m) so long as no  additional  collateral is granted
as security thereby.

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

                  "Predecessor Note" of any particular Note means every previous
Note  evidencing  all or a portion  of the same debt as that  evidenced  by such
particular   Note;  and,  for  the  purposes  of  this   definition,   any  Note
authenticated  and delivered under Section 3.08 in exchange for a mutilated Note
or in lieu of a lost,  destroyed  or stolen Note shall be deemed to evidence the
same debt as the mutilated, lost, destroyed or stolen Note.

                                 Page 25 of 162
<PAGE>


                  "Preferred  Stock"  means,  with  respect to any  Person,  any
Capital Stock of any class or classes (however designated) which is preferred as
to the payment of  dividends  or  distributions,  or as to the  distribution  of
assets upon any voluntary or  involuntary  liquidation  or  dissolution  of such
Person, over the Capital Stock of any other class in such Person.

                  "Prospectus"  means the prospectus  included in a Registration
Statement,  including any  preliminary  prospectus,  and any such  prospectus as
amended  or  supplemented  by any  prospectus  supplement,  including  any  such
prospectus  supplement  with respect to the terms of the offering of any portion
of the  Notes  covered  by a  Shelf  Registration  Statement,  and by all  other
amendments and supplements to a prospectus, including post-effective amendments,
and in each case including all material incorporated by reference therein.

                  "Public Equity  Offering"  means an  underwritten  offering of
Capital Stock (other than Disqualified Stock) of the Company with gross proceeds
to the Company of at least $25 million pursuant to a registration statement that
has been declared  effective by the  Commission  pursuant to the  Securities Act
(other than a registration statement on Form S-8 or otherwise relating to equity
securities issuable under any employee benefit plan of the Company).

                  "Purchase Money Obligation"" means any Indebtedness secured by
a Lien on assets  related to the  business  of the  Company  and any  additions,
replacements,  modifications and accessions thereto,  which are purchased by the
Company at any time after the Notes are issued;  provided  that (i) the security
agreement or conditional  sales or other title  retention  contract  pursuant to
which  the Lien on such  assets  is  created  (collectively  a  "Purchase  Money
Security Agreement") shall be entered into within 180 days after the purchase or
substantial completion of the construction of such assets and shall at all times
be  confined  solely to the assets so  purchased  or  acquired,  any  additions,
replacements, modifications and accessions thereto and any proceeds and products
therefrom,  (ii)  at no  time  shall  the  aggregate  principal  amount  of  the
outstanding Indebtedness secured thereby be increased, except in connection with
the purchase of additions and  accessions  thereto and except in respect of fees
and  other  obligations  in  respect  of such  Indebtedness  and  (iii)  (A) the
aggregate   outstanding   principal  amount  of  Indebtedness   secured  thereby
(determined  on a per asset basis in the case of any additions  and  accessions)
shall not at the time such  Purchase  Money  Security  Agreement is entered into
exceed 100% of the purchase price to the Company of the assets  subject  thereto
or (B) the  Indebtedness  secured  thereby shall be with recourse  solely to the
assets so purchased or acquired, any additions, replacements,  modifications and
accessions thereto and any proceeds and products therefrom.

                  "QIB" means a "Qualified  Institutional Buyer" under Rule 144A
under the Securities Act.

                  "Qualified  Capital  Stock"  of any  Person  means any and all
Capital Stock of such Person other than Redeemable Capital Stock.

                  "Redeemable  Capital  Stock"  means any  Capital  Stock  that,
either by its terms or by the terms of any security into which it is convertible
or exchangeable or otherwise, is or upon the happening of an event or passage of
time would be,  required  to be  redeemed  prior to the Stated  Maturity  of the
principal of the Notes or is redeemable  at the option of the holder  thereof at
any  time  prior  to  any  such  Stated  Maturity,  or is  convertible  into  or
exchangeable  for debt  securities at any time prior to any such Stated Maturity
at the option of the holder thereof.

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

                                 Page 26 of 162
<PAGE>


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

                  "Registration  Rights Agreement" means the Registration Rights
Agreement,  dated as of April 13,  1998,  between  the  Company  and the Initial
Purchasers.

                  "Registration  Statement"  has the  meaning  set  forth in the
Registration Rights Agreement.

                  "Regular Record Date" for the interest payable on any Interest
Payment  Date means the  February 1 or August 1 (whether or not a Business  Day)
next preceding such Interest Payment Date.

                  "Regulation S" means Regulation S under the Securities Act, as
amended from time to time.

                  "Regulation S Global Notes" means one or more permanent Global
Notes in registered form  representing  the aggregate  principal amount of Notes
sold in reliance on Regulation S under the Securities Act.

                  "Responsible  Officer"  when used with  respect to the Trustee
means any officer or  employee  assigned to the  Corporate  Trust  Office or any
agent  of  the  Trustee  appointed  hereunder,  including  any  vice  president,
assistant vice president,  secretary,  assistant secretary, or any other officer
or  assistant  officer  of the  Trustee  or any agent of the  Trustee  appointed
hereunder to whom any corporate  trust matter is referred  because of his or her
knowledge of and familiarity with the particular subject.

                  "Rule  144A"  means Rule 144A  under the  Securities  Act,  as
amended from time to time.

                  "Rule 144A Global  Notes" means one or more  permanent  Global
Notes in registered form  representing  the aggregate  principal amount of Notes
sold in reliance on Rule 144A under the Securities Act.

                  "Sale-Leaseback  Transaction"  means any transaction or series
of related  transactions  pursuant to which the Company or a Subsidiary sells or
transfers  any property or asset in connection  with the leasing,  or the resale
against  installment  payments,  of such  property  or  asset to the  seller  or
transferor.

                  "S&P" means  Standard & Poor's  Rating  Group, a  division  of
McGraw Hill, Inc. or any successor rating agency.

                  "Securities Act" means the Securities Act of 1933, as amended,
or any successor statute.

                  "Series  A Global  Notes"  means one or more  Global  Notes in
registered form representing Series A Notes.

                  "Series A Notes"  means the Notes issued by the Company in the
offering pursuant to which the Notes have been sold to the Initial Purchasers.

                  "Series  B Global  Notes"  means one or more  Global  Notes in
registered form  representing  the aggregate  principal amount of Series B Notes
exchanged for Series A Notes pursuant to the Exchange Offer.

                  "Series B Notes"  means Notes  issued in exchange for Series A
Notes in the Exchange Offer.

                                 Page 27 of 162
<PAGE>


                  "Shelf  Registration  Statement"  has the meaning set forth in
Section 4 of the Registration Rights Agreement.

                  "Special  Record  Date"  for  the  payment  of  any  Defaulted
Interest means a date fixed by the Trustee pursuant to Section 3.09.

                  "Stated  Maturity"  means,  when  used  with  respect  to  any
Indebtedness or any installment of interest thereon, the dates specified in such
Indebtedness  as the fixed date on which the principal of such  Indebtedness  or
such installment of interest, as the case may be, is due and payable.

                  "Strategic   Investor"   means  any  Person  which  is  (or  a
controlled  Affiliate of any Person which is or a controlled  Affiliate of which
is) engaged principally in the Telecommunications Business and which has a Total
Market Capitalization of at least $500 million.

                  "Subordinated  Indebtedness" means Indebtedness of the Company
or a Guarantor  expressly  subordinated  by its terms in right of payment to the
Notes or the Guarantee of such Guarantor, as the case may be.

                  "subsidiary" means, with respect to any Person, a corporation,
association  or other  business  entity (i) of which  outstanding  Capital Stock
having at least the majority of the votes entitled to be cast in the election of
directors is owned,  directly or  indirectly,  by such Person  and/or any one or
more subsidiaries of such Person, or (ii) of which at least a majority of voting
interest is owned,  directly or  indirectly,  by such Person  and/or one or more
subsidiaries of such Person.

                  "Subsidiary" means any subsidiary of the Company other than an
Unrestricted Subsidiary.

                  "Successor  Note" of any  particular  Note  means  every  Note
issued after, and evidencing all or a portion of the same debt as that evidenced
by, such  particular  Note; and, for the purposes of this  definition,  any Note
authenticated  and delivered  under Section 3.08 in exchange for or in lieu of a
mutilated,  destroyed,  lost or stolen Note shall be deemed to evidence the same
debt as the mutilated, destroyed, lost or stolen Note.

                  "Telecommunications   Assets"  means  all  assets   (including
Capital  Stock),  rights  (contractual  or otherwise)  and  properties,  real or
personal, whether tangible or intangible, used or intended for use in connection
with a Telecommunications Business.

                  "Telecommunications Business" means, when used in reference to
any  Person,  that such  Person is  engaged  primarily  in (i) the  business  of
transmitting,  or providing  services  relating to the  transmission  of, voice,
video or data through owned or leased transmission facilities, (ii) the business
of creating, developing or marketing  communications-related  network equipment,
or services or computer-based information or (iii) businesses reasonably related
thereto,  which determination  shall, in any such case, be made in good faith by
the Board of Directors.

                  "Total  Consolidated  Indebtedness"  means,  as at any date of
determination,  an amount equal to the aggregate  amount of all  Indebtedness of
the Company and any Subsidiary,  on a Consolidated basis, outstanding as of such
date of determination, after giving effect to any Incurrence of Indebtedness and
the application of the proceeds therefrom giving rise to such determination.

                                 Page 28 of 162
<PAGE>


                  "Total Market  Capitalization"  of any Person means, as of any
day of  determination,  the sum of (a)  the  consolidated  Indebtedness  of such
Person  and any  Subsidiaries  on such  day,  plus  (b) the  product  of (i) the
aggregate  number of  outstanding  shares of common stock of such Person on such
day  (which  shall not  include  any  options  or  warrants  on,  or  securities
convertible  or  exchangeable  into,  shares of common stock of such Person) and
(ii) the average  closing  price of such common  stock over the ten  consecutive
Trading Days ending not earlier than ten Trading Days immediately  prior to such
date of determination,  plus (c) the liquidation value of any outstanding shares
of preferred  stock of such Person on such day. If no such closing  price exists
with respect to shares of any such class,  the value of such shares for purposes
of clause (b) of the  preceding  sentence  shall be  determined  by the Board of
Directors  in good  faith and  evidenced  by a Board  Resolution  filed with the
Trustee.  Notwithstanding  the  foregoing,  unless the Person's  Common Stock is
listed on any national securities exchange or on the NASDAQ National Market, the
"Total  Market  Capitalization"  of the  Person  shall  mean,  as of any  day of
determination,  the enterprise value (without duplication) of the Person and any
subsidiaries  (including  the Fair Market  Value of their debt and  equity),  as
determined by an independent  banking firm of national  standing with experience
in such  valuations  and evidenced by a written  opinion in customary form filed
with the  Trustee;  provided  that for purposes of any such  determination,  the
enterprise  value of the Person  shall be  calculated  as if the  Person  were a
publicly held corporation without a controlling stockholder. For purposes of any
such determination, such banking firm's written opinion may state that such Fair
Market Value is no less than a specified  amount and such opinion may be as of a
date no earlier than 90 days prior to the date of such determination.

                  "Trading  Day"  with  respect  to  a  securities  exchange  or
automated  quotation system means a day on which such exchange or system is open
for a full day of trading.

                  "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.

                  "Trust  Indenture Act" or "TIA" means the Trust  Indenture Act
of 1939, as amended, or any successor statute.

                  "Unrestricted  Subsidiary"  means  (i) any  subsidiary  of the
Company that at the time of  determination  shall be an Unrestricted  Subsidiary
(as designated by the Board of Directors of the Company,  as provided below) and
(ii) any subsidiary of an Unrestricted Subsidiary. The Board of Directors of the
Company  may  designate  any  subsidiary  of the  Company  (including  any newly
acquired or newly formed subsidiary) to be an Unrestricted  Subsidiary if all of
the  following  conditions  apply:  (a)  neither  the  Company  nor  any  of its
Subsidiaries  provides  credit  support  for  Indebtedness  of  such  subsidiary
(including   any   undertaking,   agreement  or   instrument   evidencing   such
Indebtedness),  (b) such subsidiary is not liable, directly or indirectly,  with
respect to any Indebtedness other than Unrestricted Subsidiary Indebtedness, (c)
any  Investment  in  such  subsidiary  made  as a  result  of  designating  such
subsidiary  an  Unrestricted  Subsidiary  shall not  violate the  provisions  of
Section 10.18 and such  Unrestricted  Subsidiary is not party to any  agreement,
contract,  arrangement  or  understanding  at such time with the  Company or any
Subsidiary  of the  Company  unless the terms of any such  agreement,  contract,
arrangement  or  understanding  are no less  favorable  to the  Company  or such
Subsidiary  than those that might be obtained  at the time from  Persons who are
not Affiliates of the Company; and (v) such Unrestricted Subsidiary does not own
any Capital Stock in any  Subsidiary of the Company which is not  simultaneously
being designated an Unrestricted  Subsidiary.  Any such designation by the Board
of Directors of the Company shall be evidenced to the Trustee by filing with the
Trustee a board  resolution  giving effect to such  designation and an Officers'
Certificate  certifying  that  such  designation  complies  with  the  foregoing
conditions  and shall be deemed a Restricted  Payment on the date of designation
in an amount  equal to the greater of (I) the net book value of such  Investment
or (II) the fair market value of 



                                 Page 29 of 162
<PAGE>

such Investment as determined in good faith by the Company's Board of Directors.
The Board of Directors of the Company may designate any Unrestricted  Subsidiary
as a  Subsidiary;  provided  that (i)  immediately  after giving  effect to such
designation,  the Company  could incur $1.00 of additional  Indebtedness  (other
than  Permitted   Indebtedness)  pursuant  to  Section  10.08(a)  and  (ii)  all
Indebtedness of such Subsidiary  shall be deemed to be incurred on the date such
Unrestricted Subsidiary becomes a Subsidiary.

                  "Unrestricted  Subsidiary  Indebtedness"  of any  Unrestricted
Subsidiary means  Indebtedness of such  Unrestricted  Subsidiary (i) as to which
neither the  Company nor any  Subsidiary  is directly or  indirectly  liable (by
virtue of the  Company or any such  Subsidiary  being the  primary  obligor  on,
guarantor of, or otherwise liable in any respect to, such Indebtedness),  except
Guaranteed Debt of the Company or any Subsidiary to any Affiliate, in which case
(unless the incurrence of such Guaranteed Debt resulted in a Restricted  Payment
at the time of incurrence) the Company shall be deemed to have made a Restricted
Payment equal to the  principal  amount of any such  Indebtedness  to the extent
guaranteed at the time such Affiliate is designated an  Unrestricted  Subsidiary
and (ii) which, upon the occurrence of a default with respect thereto,  does not
result  in, or permit  any  holder of any  Indebtedness  of the  Company  or any
Subsidiary  to  declare,  a default on such  Indebtedness  of the Company or any
Subsidiary or cause the payment  thereof to be  accelerated  or payable prior to
its Stated Maturity.

                  "U.S. Government  Securities" means securities that are direct
obligations of the United States of America, the payment of which its full faith
and credit is pledged.

                  "Voting  Stock"  means  Capital  Stock of the class or classes
pursuant  to which the  holders  thereof  have the  general  voting  power under
ordinary  circumstances  to elect at least a majority of the Board of Directors,
managers  or trustees of a  corporation  (irrespective  of whether or not at the
time Capital Stock of any other class or classes shall have or might have voting
power by reason of the happening of any contingency).

                  "Wholly-Owned  Subsidiary"  means a Subsidiary all the Capital
Stock of which is owned by the Company or another Wholly-Owned  Subsidiary.  For
the purposes of this definition,  any director  qualifying shares or investments
by foreign  nationals  mandated by or required to maintain its limited liability
status under,  applicable law shall be disregarded in determining  the ownership
of a Subsidiary.

                  Other Definitions.

Term                                                          Defined in Section
- ----                                                          ------------------

"Act"........................................................       1.05
"Agent Members"..............................................       3.06
"Change of Control Offer"....................................      10.14
"Change of Control Purchase Date"............................      10.14
"Change of Control Purchase Notice"..........................      10.14
"Change of Control Purchase Price"...........................      10.14
"Covenant Defeasance"........................................       4.03
"Defaulted Interest".........................................       3.09
"Defeasance".................................................       4.02
"Defeasance Redemption Date".................................       4.04
"Defeased Notes".............................................       4.01


                                 Page 30 of 162
<PAGE>
Term                                                          Defined in Section
- ----                                                          ------------------
"Excess Proceeds"............................................      10.12
"Note Amount"................................................      10.12
"Note Register"..............................................       3.05
"Note Registrar".............................................       3.05
"Offer"......................................................      10.12
"Offer Date".................................................      10.12
"Offered Price"..............................................      10.12
"Pari Passu Debt Amount".....................................      10.12
"Pari Passu Offer"...........................................      10.12
"Permitted Indebtedness".....................................      10.08
"Permitted Payment"..........................................      10.09
"Private Placement Legend"...................................       2.02
"Refinancing"................................................      10.08
"Required Filing Date".......................................      10.19
"Restricted Payments"........................................      10.09
"Special Payment Date".......................................       3.09
"Surviving Entity"...........................................       8.01
"U.S. Government Securities".................................       4.04

                  Section 1.03. 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 and any
Guarantor (if  applicable)  and any other  obligor on the Notes (if  applicable)
shall  furnish to the Trustee an Officers'  Certificate  in a form and substance
reasonably acceptable to the Trustee 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 in a form and substance reasonably
acceptable  to the Trustee  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
certificates  or opinions 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  of  Counsel  with  respect to
compliance  with a condition or covenant  provided for in this  Indenture  shall
include:

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

                  (b)      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;

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

                                 Page 31 of 162
<PAGE>


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

                  Section 1.04. 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 of an officer of the Company, any Guarantor or
other obligor on the Notes may be based, insofar as it relates to legal matters,
upon a certificate or opinion of, or  representations  by, counsel,  unless such
officer  knows,  or in the exercise of  reasonable  care should  know,  that the
certificate or opinion or representations with respect to the matters upon which
his or her certificate or opinion is based are erroneous.  Any such  certificate
or opinion  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,  any  Guarantor  or  other  obligor  on  the  Notes  stating  that  the
information  with respect to such factual  matters is in the  possession  of the
Company,  any  Guarantor or other  obligor on the Notes,  unless such officer or
counsel  knows,  or in the exercise of  reasonable  care should  know,  that the
certificate  or opinion or  representations  with  respect to such  matters  are
erroneous.  Opinions of Counsel required to be delivered to the Trustee may have
qualifications   customary  for  opinions  of  the  type  required  and  counsel
delivering  such Opinions of Counsel may rely on  certificates of the Company or
government  or other  officials  customary  for  opinions of the type  required,
including certificates  certifying as to matters of fact, including that various
financial covenants have been complied with.

                  Any  certificate or opinion of an officer of the Company,  any
Guarantor or other  obligor on the Notes may be based,  insofar as it relates to
accounting matters,  upon a certificate or opinion of, or representations by, an
accountant  or firm of  accountants  in the employ of the  Company,  unless such
officer  knows,  or in the exercise of  reasonable  care should  know,  that the
certificate or opinion or representations with respect to the accounting matters
upon  which  his  certificate  or  opinion  may  be  based  are  erroneous.  Any
certificate or opinion of any independent firm of public  accountants filed with
the Trustee shall contain a statement that such firm is independent with respect
to the Company.

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

                  Section 1.05. 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 an agent
duly appointed in writing;  and, except as herein otherwise  expressly provided,
such action shall become  effective  when such  instrument  or  instruments  are
delivered  to the Trustee and,  where it is hereby  expressly  required,  to the
Company.  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  conclusive  in  favor of the  Trustee  and the
Company, if made in the manner provided in this Section 1.05

                                 Page 32 of 162
<PAGE>


                  (b)      The  ownership  of  Notes  shall  be  proved  by the 
Note Register.

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

                  (d)      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 his  authority.  The fact and date of the  execution of any
such instrument or writing,  or the authority of the Person  executing the same,
may also be proved in any other manner which the Trustee deems sufficient.

                  (e)      If  the  Company  shall solicit from  the Holders 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 such  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  Trust
Indenture  Act  Section  316(c),  any such  record date shall be the record date
specified  in or  pursuant to such Board  Resolution,  which shall be a date not
more than 30 days  prior to the  first  solicitation  of  Holders  generally  in
connection  therewith  and no later  than the date such  first  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  purposes  of
determining   whether  Holders  of  the  requisite   proportion  of  Notes  then
Outstanding  have  authorized  or agreed or consented to such  request,  demand,
authorization,  direction,  notice,  consent,  waiver or other Act, and for this
purpose the Notes then  Outstanding  shall be  computed as of such record  date;
provided  that  no  such  request,  demand,  authorization,  direction,  notice,
consent,  waiver or other Act 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 such record date.

                  (f)      For  purposes  of  this Indenture, any  action by the
Holders  which may be taken in writing  may be taken by  electronic  means or as
otherwise reasonably acceptable to the Trustee.

  Section 1.06. Notices, etc., to the Trustee, the Company and any Guarantor.

                  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:

                  (a)      the  Trustee  by  any  Holder  or by the  Company  or
any Guarantor or any other  obligor on the Notes shall be  sufficient  for every
purpose  (except as provided  in Section  5.01(c))  hereunder  if in writing and
mailed,  first-class  postage  prepaid,  or  delivered by  recognized  overnight
courier,  to or with the  Trustee  at its  Corporate  Trust  Office,  Attention:
Corporate Trust Administration,  or 



                                 Page 33 of 162
<PAGE>

at any other  address  previously  furnished  in writing  to the  Holders or the
Company, any Guarantor or any other obligor on the Notes by the Trustee; or

                  (b)      the  Company  or any  Guarantor by the Trustee or any
Holder  shall be  sufficient  for every  purpose  (except as provided in Section
5.01(c))  hereunder if in writing and mailed,  first-class  postage prepaid,  or
delivered by  recognized  overnight  courier,  to the Company or such  Guarantor
addressed  to PSINet  Inc.,  510 Huntmar  Park Drive,  Herndon,  VA  20170-5100,
Attention:  Chief Financial Officer,  with a copy to Nixon,  Hargrave,  Devans &
Doyle LLP, 437 Madison Avenue, New York, NY 10022, Attention: Richard F. Langan,
Jr.,  Esq.,  or at any other  address  previously  furnished  in  writing to the
Trustee by the Company or such Guarantor.

                  Section 1.07. to Holders; Waiver.

                  Where  this  Indenture  provides  for notice to Holders of any
event,  such  notice  shall  be  sufficiently  given  (unless  otherwise  herein
expressly  provided) if in writing and mailed,  first-class  postage prepaid, or
delivered  by  recognized  overnight  courier,  to each Holder  affected by such
event,  at its  address as it appears in the Note  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.  Any notice when mailed to a Holder in the aforesaid manner shall
be  conclusively  deemed to have been  received  by such  Holder  whether or not
actually  received by such Holder.  Where this Indenture  provides for notice in
any  manner,  such  notice may be waived in writing  by the Person  entitled  to
receive such notice,  either before or after the event, and such waiver shall be
the equivalent of such notice.  Waivers of notice by Holders shall be filed with
the Trustee,  but such filing shall not be a condition precedent to the validity
of any action taken in reliance upon such waiver.

                  In case by reason of the suspension of regular mail service or
by reason of any other cause,  it shall be  impracticable  to mail notice of any
event as required by any provision of this Indenture,  then any method of giving
such notice as shall be reasonably  satisfactory  to the Trustee shall be deemed
to be a sufficient giving of such notice.

                  Section 1.08. Conflict with Trust Indenture Act.

                  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, the 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 to be
excluded, as the case may be.

                  Section 1.09. 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 1.10. Successors and Assigns.

                  All covenants and agreements in this Indenture by the Company,
the Guarantors,  if any, and the Trustee shall bind their respective  successors
and assigns, whether so expressed or not.

                                 Page 34 of 162
<PAGE>


                  Section 1.11. Separability Clause.

                  In case any provision in this  Indenture or in the Notes 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 1.12. Benefits of Indenture.

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

                  Section 1.13. Governing Law.

                  THIS INDENTURE,  THE NOTES AND ANY GUARANTEE SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT
GIVING EFFECT TO THE CONFLICTS OF LAWS PRINCIPLES THEREOF.

                  Section 1.14. Legal Holidays.

                  In any case where any Interest Payment Date,  Redemption Date,
Maturity  or Stated  Maturity  of any Note  shall not be a  Business  Day,  then
(notwithstanding  any other provision of this Indenture or of the Notes) payment
of interest or principal or premium,  if any, 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 such Interest  Payment Date or Redemption Date, or at the Maturity
or Stated Maturity and no interest shall accrue with respect to such payment for
the period from and after such Interest Payment Date,  Redemption Date, Maturity
or Stated Maturity, as the case may be, to the next succeeding Business Day.

                  Section 1.15. 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 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  or an Event of  Default  if such  action  is taken or
condition exists.

                  Section 1.16. Schedules and Exhibits.

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

                  Section 1.17. Counterparts.

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

                  Section 1.18. No Adverse Interpretation of Other Agreements.

                  This Indenture may not be used to interpret another indenture,
loan or debt  agreement or instrument  of the Company or a Subsidiary.  Any such
indenture,  loan or debt  agreement or  instrument  may not be used to interpret
this Indenture.


                                 Page 35 of 162
<PAGE>

                  Section 1.19. No Recourse against Others.

                  A director,  officer, employee or shareholder, as such, of the
Company or any Guarantor shall not have any liability for any obligations of the
Company or any Guarantor under the Notes,  any Guarantee or the Indenture or for
any claim  based on, in respect of or by reason of,  such  obligations  or their
creation;  provided,  however,  that the foregoing shall not relieve the Company
from any of its  liabilities or obligations  under the Notes or this  Indenture.
Each Holder by accepting any of the Notes and Guarantees waives and releases all
such  liability.  The waiver and release are part of the  consideration  for the
issue of the Notes and Guarantees.

                                   ARTICLE II
                                   Notes Forms

                  Section 2.01. Forms Generally.

                  The  Notes and the  Trustee's  certificate  of  authentication
thereon shall be in  substantially  the forms set forth in this Article II, with
such appropriate  insertions,  omissions,  substitutions and other variations as
are required or  permitted  hereby 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,   any
organizational  document or governing  instrument or  applicable  law or as may,
consistently  herewith,  be determined by the officers  executing  such Notes as
evidenced by their execution of the Notes.  Any portion of the text of any Notes
may be set forth on the reverse thereof,  with an appropriate  reference thereto
on the face of the Notes.

                  The  definitive  Notes  shall  be  printed,   lithographed  or
engraved or produced by any  combination  of these methods or may be produced in
any other manner permitted by the rules of any securities  exchange on which the
Notes may be listed,  all as determined by the officers executing such Notes, as
evidenced by their execution of such Notes.

                  Series A Notes offered and sold in reliance on Rule 144A shall
be  issued  initially  in the  form  of one or  more  Rule  144A  Global  Notes,
substantially  in the form set forth in Section  2.02,  deposited  upon issuance
with the Trustee, as custodian for the Depositary, registered in the name of the
Depositary, or its nominee, in each case for credit to an account of a direct or
indirect  participant  of the  Depositary,  duly  executed  by the  Company  and
authenticated by the Trustee as hereinafter  provided.  The aggregate  principal
amount of the Rule 144A  Global  Notes  may from  time to time be  increased  or
decreased by  adjustments  made on the records of the Trustee,  as custodian for
the Depositary or its nominee, as hereinafter provided.

                  Series A Notes  offered and sold in reliance on  Regulation  S
shall  be  issued  in the  form  of one  or  more  Regulation  S  Global  Notes,
substantially  in the form set forth in Section  2.02,  deposited  upon issuance
with the Trustee, as custodian for the Depositary, registered in the name of the
Depositary,  or its  nominee  in each case for  credit by the  Depositary  to an
account of a direct or indirect participant of the Depositary,  duly executed by
the Company and authenticated by the Trustee as hereinafter provided;  provided,
however,  that upon such deposit  through and  including  the 40th day after the
later of the  commencement  of the Offering  and the original  issue date of the
Notes  (such  period  through  and  including  such  40th day,  the  "Restricted
Period"),  all such Notes shall be credited to or through accounts maintained at
the Depositary  unless  exchanged for interests in the Rule 144A Global Notes in
accordance with the transfer and certification requirements described below. The
aggregate  principal  amount of the  Regulation  S Global Notes may from time to
time be  increased  or  decreased  by  adjustments  made on the  records  of the
Trustee,  as  custodian  for  the  Depositary  or its  nominee,  as  hereinafter
provided.

                                 Page 36 of 162
<PAGE>


                  Series B Notes  exchanged  for Series A Notes  shall be issued
initially in the form of one or more Series B Global Notes, substantially in the
form set forth in Section 2.02,  deposited  upon  issuance with the Trustee,  as
custodian for the  Depositary,  registered in the name of the  Depositary or its
nominee,  in each  case  for  credit  to an  account  of a  direct  or  indirect
participant of the Depositary, duly executed by the Company and authenticated by
the Trustee as  hereinafter  provided.  The  aggregate  principal  amount of the
Series B Global  Notes  may  from  time to time be  increased  or  decreased  by
adjustments made on the records of the Trustee,  as custodian for the Depositary
or its nominee, as hereinafter provided.

                  Section 2.02. Form of Face of Note.

                  (a)      The   form  of  the  face  of  any   Series  A  Notes
authenticated and delivered hereunder shall be substantially as follows:

                           Unless and until (i) a Series A Note is sold under an
effective Registration Statement or (ii) a Series A
Note  is  exchanged  for a  Series  B  Note  in  connection  with  an  effective
Registration  Statement,  in  each  case  pursuant  to the  Registration  Rights
Agreement,  then such  Series A Note shall bear the legend set forth  below (the
"Private Placement Legend") on the face thereof:

                  THIS NOTE (OR ITS  PREDECESSOR)  HAS NOT BEEN REGISTERED UNDER
THE U.S.  SECURITIES  ACT OF 1933,  AS  AMENDED  (THE  "SECURITIES  ACT"),  AND,
ACCORDINGLY,  MAY NOT BE OFFERED,  SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHIN
THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS,  EXCEPT
AS SET FORTH IN THE NEXT SENTENCE.  BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL
INTEREST HEREIN, THE HOLDER:

                  (1)      REPRESENTS THAT (A) IT IS A "QUALIFIED  INSTITUTIONAL
                  BUYER" (AS DEFINED IN RULE 144A UNDER THE  SECURITIES  ACT) (A
                  "QIB")  OR  (B) IT  HAS  ACQUIRED  THIS  NOTE  IN AN  OFFSHORE
                  TRANSACTION  IN  COMPLIANCE   WITH   REGULATION  S  UNDER  THE
                  SECURITIES ACT,

                  (2)      AGREES THAT IT WILL NOT RESELL OR OTHERWISE  TRANSFER
                  THIS   NOTE   EXCEPT  (A)  TO  THE  COMPANY  OR  ANY  OF   ITS
                  SUBSIDIARIES,  (B) TO  A PERSON  WHOM  THE  SELLER  REASONABLY
                  BELIEVES IS  A QIB  PURCHASING  FOR ITS OWN ACCOUNT OR FOR THE
                  ACCOUNT OF A QIB IN  A TRANSACTION  MEETING  THE  REQUIREMENTS
                  OF RULE  144A,  (C) IN  AN  OFFSHORE  TRANSACTION  MEETING THE
                  REQUIREMENTS  OF RULE 903 OR  904 OF  THE SECURITIES  ACT, (D)
                  IN A  TRANSACTION  MEETING  THE REQUIREMENTS OF RULE 144 UNDER
                  THE SECURITIES  ACT, (E) IN  ACCORDANCE WITH ANOTHER EXEMPTION
                  FROM  THE  REGISTRATION  REQUIREMENTS  OF THE  SECURITIES  ACT
                  (AND BASED UPON  AN  OPINION  OF  COUNSEL  ACCEPTABLE  TO  THE
                  COMPANY)   OR  (F)  PURSUANT  TO   AN  EFFECTIVE  REGISTRATION
                  STATEMENT   AND,  IN  EACH  CASE,  IN   ACCORDANCE   WITH  THE
                  APPLICABLE SECURITIES LAWS OF  ANY  STATE OF THE UNITED STATES
                  OR ANY OTHER APPLICABLE JURISDICTION AND

                                 Page 37 of 162
<PAGE>


                  (3)      AGREES  THAT IT WILL  DELIVER TO EACH  PERSON TO WHOM
                  THIS NOTE OR AN INTEREST  HEREIN  IS   TRANSFERRED   A  NOTICE
                  SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

                  AS USED HEREIN,  THE TERMS "OFFSHORE  TRANSACTION" AND "UNITED
STATES"  HAVE THE MEANINGS  GIVEN TO THEM BY RULE 902 OF  REGULATION S UNDER THE
SECURITIES  ACT. THE  INDENTURE  CONTAINS A PROVISION  REQUIRING  THE TRUSTEE TO
REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING.

                  Each Global Note,  whether or not a Series A Note,  shall also
bear the following legend on the face thereof:

                  THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER  REFERRED  TO AND IS  REGISTERED  IN THE NAME OF A  DEPOSITARY  OR A
NOMINEE OF A DEPOSITARY OR A SUCCESSOR DEPOSITARY. TRANSFERS OF THIS GLOBAL NOTE
SHALL BE LIMITED TO TRANSFERS IN WHOLE,  BUT NOT IN PART,  TO NOMINEES OF CEDE &
CO. OR TO A  SUCCESSOR  THEREOF OR SUCH  SUCCESSOR'S  NOMINEE AND  TRANSFERS  OF
PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO  TRANSFERS  MADE IN  ACCORDANCE
WITH THE RESTRICTIONS SET FORTH IN SECTIONS 3.06 AND 3.07 OF THE INDENTURE.

                  UNLESS  THIS   CERTIFICATE   IS  PRESENTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY, A NEW YORK CORPORATION  ("DTC"),
TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER,  EXCHANGE,  OR PAYMENT
AND ANY SUCH  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.

                                   PSINET INC.


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


                       10% SENIOR NOTE DUE 2005, SERIES A

                            CUSIP NO. ______________

                     No. __________ $_______________________


                  PSINet  Inc.,  a  New  York  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  _______________
United  States  dollars on  February  15,  2005,  at the office or agency of the
Company  referred to below,  and to pay interest thereon from April 13, 1998, or
from the most recent  Interest  Payment Date to which  interest has 



                                 Page 38 of 162
<PAGE>

been paid or duly  provided for,  semiannually  on August 15 and February 15, in
each year,  commencing August 15, 1998 at the rate of 10% per annum,  subject to
adjustments  as described in the second  following  paragraph,  in United States
dollars, until the principal hereof is paid or duly provided for. Interest shall
be computed on the basis of a 360-day year comprised of twelve 30-day months.

                  The Holder of this Series A Note is  entitled to the  benefits
of the  Registration  Rights  Agreement  between  the  Company  and the  Initial
Purchasers,  dated as of April 13, 1998, pursuant to which, subject to the terms
and  conditions  thereof,  the Company is obligated to  consummate  the Exchange
Offer pursuant to which the Holder of this Note shall have the right to exchange
this Note for 10% Senior Notes due 2005,  Series B (herein  called the "Series B
Notes") in like principal amount as provided therein. The Series A Notes and the
Series B Notes are together referred to as the "Notes".  The Series A Notes rank
pari passu in right of payment with the Series B Notes.

                  In  the  event  that  (a)  the  Exchange  Offer   Registration
Statement is not filed with the  Commission on or prior to the date specified in
the Registration Rights Agreement, (b) the Exchange Offer Registration Statement
is not declared  effective on or prior to the date specified in the Registration
Rights  Agreement,  (c) the Exchange Offer is not consummated on or prior to the
date specified in the Registration  Rights  Agreement,  (d) if obligated to file
the  Shelf  Registration  Statement,   the  Company  fails  to  file  the  Shelf
Registration  Statement with the Commission on or prior to the date specified in
the  Registration  Rights  Agreement,   (e)  if  obligated  to  file  the  Shelf
Registration  Statement,  the  Shelf  Registration  Statement  is  not  declared
effective  on or  prior  to  the  date  specified  in  the  Registration  Rights
Agreement,  or (f)  the  Shelf  Registration  Statement  or the  Exchange  Offer
Registration  Statement  is  declared  effective  but  thereafter  ceases  to be
effective or usable in connection  with resales of the Series A Notes during the
periods specified in the Registration Rights Agreement (each such event referred
to in clauses (a)  through (f) above,  a  "Registration  Default"),  the Company
agrees to pay to each Holder of Series A Notes liquidated  damages  ("Liquidated
Damages") in an amount equal to $0.05 per week per $1,000 in principal amount of
Series A Notes held by such  Holder for each week or  portion  thereof  that the
Registration Default continues for the first 90 day period immediately following
the occurrence of such Registration  Default.  The amount of Liquidated  Damages
shall increase by an additional $0.05 per week per $1,000 in principal amount of
Series  A Notes  with  respect  to  each  subsequent  90 day  period  until  all
Registration  Defaults  have been cured,  up to a maximum  amount of  Liquidated
Damages of $0.50 per week per $1,000 in principal  amount of Series A Notes. The
Company  shall  not be  required  to pay  Liquidated  Damages  for more than one
Registration  Default at any given time.  Following the cure of all Registration
Defaults,  the accrual of Liquidated Damages shall cease. All accrued Liquidated
Damages  shall  be paid by the  Company  to  holders  entitled  thereto  by wire
transfer  to the  accounts  specified  by them or by  mailing  checks  to  their
registered address if no such accounts have been specified.

                  The interest so payable,  and punctually paid or duly provided
for, on any Interest Payment Date will, as provided in the Indenture hereinafter
referred  to, be paid to the Person in whose name this Note (or any  Predecessor
Notes) is  registered  at the close of business  on the Regular  Record Date for
such  interest,  which  shall be the August 1 or  February  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, and interest on
such defaulted interest at the interest rate borne by the Series A Notes, to the
extent lawful, shall forthwith cease to be payable to the Holder on such Regular
Record  Date,  and may  either be paid to the Person in whose name this Note (or
any  Predecessor  Notes) 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 Notes not less than 10 days
prior to such Special  Record  Date,  or be paid at any time in any other lawful
manner not  inconsistent  with the  requirements  of any securities  exchange on
which the Notes may be listed,  and upon such  notice as may be required by 



                                 Page 39 of 162
<PAGE>

this Indenture not inconsistent  with the requirements of such exchange,  all as
more fully provided in this Indenture.

                  Payment of the principal of, premium, if any, and interest on,
this Note,  and exchange or transfer of the Note,  will be made at the office or
agency of the Company in the City of New York maintained for that purpose (which
initially  will be the Trustee c/o Harris  Trust  Company of New York,  77 Water
Street,  New  York,  NY  10005),  or at such  other  office  or agency as may be
maintained  for such  purpose,  or, at the  option of the  Company,  payment  of
interest  may be made by check  mailed to the  address  of the  Person  entitled
thereto as such address shall appear on the Note  Register,  and provided,  that
payment by wire transfer of  immediately  available  funds will be required with
respect to principal of and interest on all Global Notes and all other Notes the
Holders of which shall have provided wire transfer  instructions  to the Company
or the Paying  Agent.  Such  payment  shall be 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.

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

                  Unless the certificate of authentication  hereon has been duly
executed  by  the  Trustee   referred  to  on  the  reverse  hereof  or  by  the
authenticating  agent appointed as provided in the Indenture by manual signature
of an  authorized  signer,  this Note shall not be entitled to any benefit under
the Indenture, or be valid or obligatory for any purpose.

                  IN WITNESS WHEREOF,  the Company has caused this instrument to
be duly executed by the manual or facsimile signature of its authorized officers
and its corporate seal to be affixed or reproduced hereon.

                                            PSINET INC.


[Seal]                                      By:___________________________
                                            Title:________________________

Attest:


- ----------------------------
Authorized Officer






                                 Page 40 of 162
<PAGE>


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION


                  This  is one of the  10%  Senior  Notes  due  2005,  Series  A
referred to in the within-mentioned Indenture.

                            WILMINGTON TRUST COMPANY,
                                   as Trustee



                                            By:  _______________________________
                                                       Authorized Signer

Dated:


                       OPTION OF HOLDER TO ELECT PURCHASE



                  If  you  wish  to  have  this  Note  purchased  by the Company
pursuant to Section 10.12 or Section  10.14,  as  applicable,  of the Indenture,
check the Box: [_].

                  If you wish to have a portion of  this  Note  purchased by the
Company  pursuant  to  Section  10.12 or  Section  10.14 as  applicable,  of the
Indenture, state the amount (in original principal amount):

                       $ ---------------.


Date:  ___________________


                                          Your Signature:  _____________________


(Sign exactly as your name appears on the other side of this Note)


Signature Guarantee:  __________________________________


[Signature must be guaranteed by an eligible Guarantor Institution (banks, stock
brokers,  savings and loan associations and credit unions) with membership in an
approved  guarantee  medallion  program  pursuant  to  Securities  and  Exchange
Commission Rule 17Ad-15]

                  The form of the face of any Series B Notes  authenticated  and
delivered hereunder shall be substantially as follows:

                  [Legend if Note is a Global Note]

                                 Page 41 of 162
<PAGE>


                  THIS SECURITY IS A GLOBAL  SECURITY  WITHIN THE MEANING OF THE
INDENTURE  HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITARY
OR A NOMINEE OF A DEPOSITARY OR A SUCCESSOR DEPOSITARY. TRANSFERS OF THIS GLOBAL
SECURITY SHALL BE LIMITED TO TRANSFERS IN WHOLE, BUT NOT IN PART, TO NOMINEES OF
CEDE & CO. OR TO A SUCCESSOR  THEREOF OR SUCH SUCCESSOR'S  NOMINEE AND TRANSFERS
OF  PORTIONS  OF THIS  GLOBAL  SECURITY  SHALL BE LIMITED TO  TRANSFERS  MADE IN
ACCORDANCE  WITH THE  RESTRICTIONS  SET FORTH IN  SECTIONS  3.06 AND 3.07 OF THE
INDENTURE.

                  UNLESS  THIS   CERTIFICATE   IS  PRESENTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY, A NEW YORK CORPORATION  ("DTC"),
TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER,  EXCHANGE,  OR PAYMENT
AND ANY SUCH  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.




                                 Page 42 of 162
<PAGE>




                                   PSINET INC.



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


                       10% SENIOR NOTE DUE 2005, SERIES B


                            CUSIP NO. ______________


No. __________                                       $_______________________


                  PSINET  INC.,  a  New  York  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 _______________ United
States  dollars on  February  15,  2005,  at the office or agency of the Company
referred to below,  and to pay interest thereon from April 13, 1998, or from the
most  recent  Interest  Payment  Date to which  interest  has been  paid or duly
provided for, semiannually on August 15 and February 15 in each year, commencing
August 15, 1998 at the rate of 10% per annum,  in United States  dollars,  until
the principal  hereof is paid or duly provided for;  provided that to the extent
interest  has not been paid or duly  provided  for with  respect to the Series A
Note  exchanged  for this  Series B Note,  interest  on this Series B Note shall
accrue  from the most  recent  Interest  Payment  Date to which  interest on the
Series A Note which was  exchanged  for this Series B Note has been paid or duly
provided  for.  Interest  shall  be  computed  on the  basis of a  360-day  year
comprised of twelve 30-day months.

                  This Series B Note was issued  pursuant to the Exchange  Offer
pursuant  to which the 10% Senior  Notes due 2005,  Series A (herein  called the
"Series A Notes")  in like  principal  amount  were  exchanged  for the Series B
Notes.  The Series B Notes rank pari passu in right of payment with the Series A
Notes.

                  The interest so payable,  and punctually paid or duly provided
for, on any Interest Payment Date will, as provided in the Indenture hereinafter
referred  to, be paid to the Person in whose name this Note (or any  Predecessor
Notes) is  registered  at the close of business  on the Regular  Record Date for
such  interest,  which  shall be the August 1 or  February  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, and interest on
such defaulted interest at the interest rate borne by the Series B Notes, to the
extent lawful, shall forthwith cease to be payable to the Holder on such Regular
Record  Date,  and may  either be paid to the Person in whose name this Note (or
any  Predecessor  Notes) 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 Notes not less than 10 days
prior to such Special  Record  Date,  or be paid at any time in any other lawful
manner not  inconsistent  with the  requirements  of any securities  exchange on
which the Notes may be listed,  and upon such  notice as may be required by such
exchange, all as more fully provided in this Indenture.

                  Payment of the principal of, premium, if any, and interest on,
this Note,  and exchange or transfer of the Note,  will be made at the office or
agency of the Company in the City of New York maintained for such purpose (which
initially  will be the Trustee c/o Harris  Trust  Company of New York,  



                                 Page 43 of 162
<PAGE>

77 Water Street,  New York, NY 10005),  or at such other office or agency as may
be  maintained  for such  purpose,  or at such other  office or agency as may be
maintained  for such  purpose,  or, at the  option of the  Company,  payment  of
interest  may be made by check  mailed to the  address  of the  Person  entitled
thereto as such address shall appear on the Note  Register,  and provided,  that
payment by wire transfer of  immediately  available  funds will be required with
respect to principal of and interest on all Global Notes and all other Notes the
Holders of which shall have provided wire transfer  instructions  to the Company
or the Paying  Agent.  Such  payment  shall be 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.

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

                  Unless the certificate of authentication  hereon has been duly
executed  by  the  Trustee   referred  to  on  the  reverse  hereof  or  by  the
authenticating  agent appointed as provided in the Indenture by manual signature
of an  authorized  signer,  this Note shall not be entitled to any benefit under
the Indenture, or be valid or obligatory for any purpose.

                  IN WITNESS WHEREOF,  the Company has caused this instrument to
be duly executed by the manual or facsimile signature of its authorized officers
and its corporate seal to be affixed or reproduced hereon.

                                            PSINET INC.


[Seal]                                      By:_________________________________
                                            Title:______________________________

Attest:


- ----------------------------
Authorized Officer


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION



                  This  is one of the  10%  Senior  Notes  due  2005,  Series  B
referred to in the within-mentioned Indenture.

                                            WILMINGTON TRUST COMPANY
                                                as Trustee


                                            By:  _______________________________
                                                       Authorized Signer

Dated:


                                 Page 44 of 162
<PAGE>

                       OPTION OF HOLDER TO ELECT PURCHASE



                  If  you  wish  to  have  this  Note  purchased  by the Company
pursuant to Section 10.12 or Section  10.14,  as  applicable,  of the Indenture,
check the Box: [_].

                  If you wish to have a portion of  this Note  purchased by  the
Company  pursuant  to  Section  10.12 or  Section  10.14 as  applicable,  of the
Indenture, state the amount (in original principal amount):

                       $ ---------------.


Date:  ___________________          Your Signature:  _____________________


(Sign exactly as your name appears on the other side of this Note)


Signature Guarantee:  __________________________________


[Signature must be guaranteed by an eligible Guarantor Institution (banks, stock
brokers,  savings and loan associations and credit unions) with membership in an
approved  guarantee  medallion  program  pursuant  to  Securities  and  Exchange
Commission Rule 17Ad-15]

Form of Reverse of Notes.

                  The  form  of the  reverse  of the  Series  A Notes  shall  be
substantially as follows:

                                   PSINET INC.
                       10% Senior Note due 2005, Series A

                  This  Note is one of a duly  authorized  issue of Notes of the
Company designated as its 10% Senior Notes due 2005, Series A (herein called the
"Notes"),  limited  (except as otherwise  provided in the Indenture  referred to
below) in aggregate principal amount to $600,000,000,  issued under, entitled to
the  benefits of and  subject to the terms of an  indenture  (herein  called the
"Indenture")  dated as of April 13,  1998,  between the  Company and  Wilmington
Trust Company,  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,  any Guarantors,  the Trustee and the Holders of the Notes,  and of
the terms upon which the Notes are, and are to be, authenticated and delivered.

                  The Indenture  contains  provisions for defeasance at any time
of (a)  the  entire  Indebtedness  on the  Notes  and  (b)  certain  restrictive
covenants  and  related  Defaults  and  Events  of  Default,  in each  case upon
compliance with certain conditions set forth therein.

                  The Notes are  subject to  redemption  at any time on or after
February 15, 2002,  at the option of the  Company,  in whole or in part,  on not
less than 30 nor more than 60 days'  prior  notice,  in  amounts of $1,000 or an
integral  multiple  thereof,  at the following  redemption  prices (expressed as


                                 Page 45 of 162
<PAGE>

percentages of the principal  amount),  if redeemed  during the 12-month  period
beginning February 15 of the years indicated below:


                                                         Redemption
                        Year                                Price
                        ----                              ---------
                        2002                               105.0%
                        2003                               102.5%
                        2004                               100.0%

and  thereafter at 100% of the  principal  amount,  in each case,  together with
accrued and unpaid  interest,  if any, to the  Redemption  Date  (subject to the
rights of Holders of record on relevant record dates to receive  interest due on
an Interest Payment Date).

                  In addition, at any time on or prior to February 15, 2001, the
Company may, at its option,  use the net  proceeds of one or more Public  Equity
Offerings or the sale of Capital  Stock (other than  Disqualified  Stock) of the
Company  to a  Strategic  Investor  in a single  transaction  or in a series  of
related  transactions,  to redeem  up to an  aggregate  of 35% of the  aggregate
principal amount of Notes originally  issued under the Indenture at a redemption
price equal to 110.0% of the aggregate  principal  amount thereof,  plus accrued
and unpaid interest  thereon,  if any, to the Redemption Date;  provided that at
least 65% aggregate  principal amount of Notes remains  outstanding  immediately
after  the  occurrence  of such  redemption.  In order to effect  the  foregoing
redemption,  the Company must mail a notice of  redemption no later than 45 days
after the  closing of the  related  Public  Equity  Offering  or to a  Strategic
Investor and must consummate  such  redemption  within 60 days of the closing of
the Public Equity Offering or sale to a Strategic Investor.

                  If less than all of the Notes are to be redeemed,  the Trustee
shall select the Notes or portions thereof to be redeemed pro rata, by lot or by
any other method the Trustee shall deem fair and reasonable.

                  Upon the  occurrence  of a Change of  Control,  subject to the
terms of the  Indenture,  each Holder may  require the Company to purchase  such
Holder's  Notes  in whole  or in part in  integral  multiples  of  $1,000,  at a
purchase  price  in cash in an  amount  equal  to 101% of the  principal  amount
thereof,  plus  accrued and unpaid  interest,  if any, to the date of  purchase,
pursuant to a Change of Control  Offer in  accordance  with the  procedures  set
forth in the Indenture.

                  Under  certain  circumstances,  subject  to the  terms  of the
Indenture,  in the event the Net Cash Proceeds  received by the Company from any
Asset Sale, which proceeds are not used to repay any Pari Passu  Indebtedness of
the Company or any Subsidiary  (including the repurchase of Notes) or which will
be invested in Telecommunications Assets, exceeds a specified amount the Company
will be required to apply such proceeds by making an offer to purchase Notes and
certain Indebtedness ranking pari passu in right of payment to the Notes.

                  In the case of any redemption of Notes in accordance  with the
Indenture,  interest  installments  whose Stated  Maturity is on or prior to the
Redemption Date will be payable to the Holders of such Notes of record as of the
close of business on the  relevant  Regular  Record Date or Special  Record Date
referred to on the face hereof. Notes (or portions thereof) for whose redemption
and payment  



                                 Page 46 of 162
<PAGE>

provision is made in accordance  with the Indenture shall cease to bear interest
from and after the Redemption Date.

                  In the event of redemption of this Note in accordance with the
Indenture in part only, a new Note or Notes for the  unredeemed  portion  hereof
shall be issued in the name of the Holder hereof upon the cancellation hereof.

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

                  The  Indenture  permits,  with certain  exceptions  (including
certain  amendments  permitted  without  the  consent of any Holders and certain
amendments  which  require the consent of all the Holders) as therein  provided,
the amendment  thereof and the modification of the rights and obligations of the
Company and any Guarantors and the rights of the Holders under the Indenture and
the Notes and any Guarantees at any time by the Company and the Trustee with the
consent of the Holders of at least a majority in aggregate  principal  amount of
the  Notes at the time  Outstanding.  The  Indenture  also  contains  provisions
permitting the Holders of at least a majority in aggregate  principal  amount of
the  Notes  (100%  of  the  Holders  in  certain   circumstances)  at  the  time
Outstanding,  on behalf of the Holders of all the Notes, to waive  compliance by
the Company and any Guarantors with certain  provisions of the Indenture and the
Notes and any  Guarantees  and certain past Defaults under the Indenture and the
Notes and any Guarantees and their  consequences.  Any such consent or waiver by
or on behalf of the Holder of this Note shall be  conclusive  and  binding  upon
such Holder and upon all future Holders of this Note and of any Note 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 Note.

                  No reference  herein to the Indenture and no provision of this
Note or of the  Indenture  shall alter or impair the  obligation of the Company,
any Guarantor or any other obligor on the Notes (in the event such  Guarantor or
such other obligor is obligated to make payments in respect of the Notes), which
is absolute and  unconditional,  to pay the principal of,  premium,  if any, and
interest  on,  this  Note 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 Note is registrable in the
Note Register,  upon surrender of this Note for  registration of transfer at the
office or agency of the  Company in the  Borough of  Manhattan,  The City of New
York,  duly endorsed by, or accompanied  by a written  instrument of transfer in
form  satisfactory  to the Company and the Note  Registrar duly executed by, the
Holder hereof or its attorney duly  authorized in writing,  and thereupon one or
more new Notes, of authorized denominations and for the same aggregate principal
amount, will be issued to the designated transferee or transferees.

                  Certificated securities shall be transferred to all beneficial
holders in exchange for their beneficial interests in the Rule 144A Global Notes
or the Regulation S Global Notes if (x) the Depositary notifies the Company that
it is unwilling or unable to continue as  depository  for such Global Note and a
successor depository is not appointed by the Company within 90 days or (y) there
shall have occurred and be continuing an Event of Default and the Note Registrar
has received a request from the Depositary.  Upon any such issuance, the Trustee
is  required to register  such  certificated  Series A Notes in the name of, and
cause the same to be delivered to, such Person or Persons (or the nominee of any
thereof).  All such certificated Series A Notes would be required to include the
Private Placement Legend.

                  Series  A Notes in  certificated  form  are  issuable  only in
registered  form  without  coupons in  denominations  of $1,000 and any integral
multiple  thereof.   As  provided  in  the  Indenture  and  subject  to  certain
limitations  therein set forth,  the Series A Notes are  exchangeable for a like
aggregate principal 



                                 Page 47 of 162
<PAGE>

amount of Notes of a differing  authorized  denomination,  as  requested  by the
Holder surrendering the same.

                  At any time when the  Company is not subject to Sections 13 or
15(d) of the Exchange  Act,  upon the written  request of a Holder of a Series A
Note,  the  Company  will  promptly  furnish  or  cause  to  be  furnished  such
information as is specified pursuant to Rule 144A(d)(4) under the Securities Act
(or  any  successor  provision  thereto)  to  such  Holder  or to a  prospective
purchaser  of such  Series  A Note  who  such  Holder  informs  the  Company  is
reasonably believed to be a "Qualified  Institutional  Buyer" within the meaning
of Rule 144A under the  Securities  Act,  as the case may be, in order to permit
compliance by such Holder with Rule 144A under the Securities Act.

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

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

                  THIS NOTE SHALL BE GOVERNED  BY AND  CONSTRUED  IN  ACCORDANCE
WITH THE LAWS OF THE  STATE OF NEW YORK,  WITHOUT  REGARD  TO  CONFLICTS  OF LAW
PRINCIPLES THEREOF.

                  All terms used in this Note which are defined in the Indenture
and not otherwise defined herein shall have the meanings assigned to them in the
Indenture.

                  [The Transferee Certificate, in the form of Appendix I hereto,
will be attached to the Series A Note.]

                  The  form  of the  reverse  of the  Series  B Notes  shall  be
substantially as follows:

                                   PSINET INC.
                       10% Senior Note due 2005, Series B
                  This  Note is one of a duly  authorized  issue of Notes of the
Company designated as its 10% Senior Notes due 2005, Series B (herein called the
"Notes"),  limited  (except as otherwise  provided in the Indenture  referred to
below) in aggregate principal amount to $600,000,000,  issued under, entitled to
the  benefits of and  subject to the terms of an  indenture  (herein  called the
"Indenture")  dated as of April 13,  1998,  between the  Company and  Wilmington
Trust Company,  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,  any Guarantors,  the Trustee and the Holders of the Notes,  and of
the terms upon which the Notes are, and are to be, authenticated and delivered.

                  The Indenture  contains  provisions for defeasance at any time
of (a)  the  entire  Indebtedness  on the  Notes  and  (b)  certain  restrictive
covenants  and  related  Defaults  and  Events  of  Default,  in each  case upon
compliance with certain conditions set forth therein.

                                 Page 48 of 162
<PAGE>


                  The Notes are  subject to  redemption  at any time on or after
February 15, 2002,  at the option of the  Company,  in whole or in part,  on not
less than 30 nor more than 60 days'  prior  notice,  in  amounts of $1,000 or an
integral  multiple  thereof,  at the following  redemption  prices (expressed as
percentages of the principal  amount),  if redeemed  during the 12-month  period
beginning February 15 of the years indicated below:


                                                         Redemption
                        Year                                Price
                        ----                             ----------
                        2002                               105.0%
                        2003                               102.5%
                        2004                               100.0%

and  thereafter at 100% of the  principal  amount,  in each case,  together with
accrued and unpaid  interest,  if any, to the  Redemption  Date  (subject to the
rights of Holders of record on relevant record dates to receive  interest due on
an Interest Payment Date).

                  In addition, at any time on or prior to February 15, 2001, the
Company may, at its option,  use the net  proceeds of one or more Public  Equity
Offerings or the sale of Capital  Stock (other than  Disqualified  Stock) of the
Company  to a  Strategic  Investor  in a single  transaction  or in a series  of
related  transactions,  to redeem  up to an  aggregate  of 35% of the  aggregate
principal amount of Notes originally  issued under the Indenture at a redemption
price equal to 110.0% of the aggregate  principal  amount thereof,  plus accrued
and unpaid interest  thereon,  if any, to the Redemption Date;  provided that at
least 65% aggregate  principal amount of Notes remains  outstanding  immediately
after  the  occurrence  of such  redemption.  In order to effect  the  foregoing
redemption,  the Company must mail a notice of  redemption no later than 45 days
after the  closing of the  related  Public  Equity  Offering  or to a  Strategic
Investor and must consummate  such  redemption  within 60 days of the closing of
the Public Equity Offering or sale to a Strategic Investor.

                  If less than all of the Notes are to be redeemed,  the Trustee
shall select the Notes or portions thereof to be redeemed pro rata, by lot or by
any other method the Trustee shall deem fair and reasonable.

                  Upon the  occurrence  of a Change of  Control,  subject to the
terms of the  Indenture,  each Holder may  require the Company to purchase  such
Holder's  Notes  in whole  or in part in  integral  multiples  of  $1,000,  at a
purchase  price  in cash in an  amount  equal  to 101% of the  principal  amount
thereof,  plus  accrued and unpaid  interest  if any,  to the date of  purchase,
pursuant to Change of Control Offer and in accordance  with the  procedures  set
forth in the Indenture.

                  Under  certain  circumstances,  subject  to the  terms  of the
Indenture,  in the event the Net Cash Proceeds  received by the Company from any
Asset Sale, which proceeds are not used to repay any Pari Passu  Indebtedness of
the Company or any Subsidiary  (including the repurchase of Notes) or which will
be invested  in  Telecommunications  Assets,  exceeds a  specified  amount,  the
Company  will be required to apply such  proceeds by making an offer to purchase
Notes and  certain  Indebtedness  ranking  pari passu in right of payment to the
Notes.

                                 Page 49 of 162
<PAGE>


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

                  In the event of redemption of this Note in accordance with the
Indenture in part only, a new Note or Notes for the  unredeemed  portion  hereof
shall be issued in the name of the Holder hereof upon the cancellation hereof.

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

                  The  Indenture  permits,  with certain  exceptions  (including
certain  amendments  permitted  without  the  consent of any Holders and certain
amendments  which  required  the  consent  of  all of the  Holders)  as  therein
provided,  the  amendment  thereof  and  the  modification  of  the  rights  and
obligations  of the  Company  and any  Guarantors  and the rights of the Holders
under the Indenture and the Notes and any  Guarantees at any time by the Company
and the  Trustee  with the  consent of the  Holders  of at least a  majority  in
aggregate  principal amount of the Notes at the time Outstanding.  The Indenture
also  contains  provisions  permitting  the  Holders of at least a  majority  in
aggregate  principal  amount  of the  Notes  (100%  of the  Holders  in  certain
circumstances)  at the time  Outstanding,  on behalf of the  Holders  of all the
Notes,  to waive  compliance  by the Company  and any  Guarantors  with  certain
provisions of the Indenture  and the Notes and any  Guarantees  and certain past
Defaults  under  the  Indenture  and the  Notes  and any  Guarantees  and  their
consequences.  Any such  consent or waiver by or on behalf of the Holder of this
Note  shall be  conclusive  and  binding  upon such  Holder  and upon all future
Holders of this Note and of any Note  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 Note.

                  No reference  herein to the Indenture and no provision of this
Note or of the  Indenture  shall alter or impair the  obligation of the Company,
any Guarantor or any other obligor on the Notes (in the event such  Guarantor or
such other obligor is obligated to make payments in respect of the Notes), which
is absolute and unconditional, to pay the principal of, and premium, if any, and
interest  on,  this  Note 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 Note is registrable in the
Note Register,  upon surrender of this Note for  registration of transfer at the
office or agency of the  Company in the  Borough of  Manhattan,  The City of New
York,  duly endorsed by, or accompanied  by a written  instrument of transfer in
form  satisfactory  to the Company and the Note  Registrar duly executed by, the
Holder hereof or its attorney duly  authorized in writing,  and thereupon one or
more new Notes, of authorized denominations and for the same aggregate .

                  Certificated securities shall be transferred to all beneficial
holders in exchange for their beneficial  interests in the Series B Global Notes
if (x) the  Depositary  notifies  the Company  that it is unwilling or unable to
continue as  depository  for such Global Note and a successor  depository is not
appointed by the Company  within 90 days or (y) there shall have occurred and be
continuing  an Event of Default and the Note  Registrar  has  received a request
from the Depositary. Upon any such issuance, the Trustee is required to register
such  certificated  Series  B Notes in the name  of,  and  cause  the same to be
delivered to, such Person or Persons (or the nominee of any thereof).

                                 Page 50 of 162
<PAGE>


                  Series  B Notes in  certificated  form  are  issuable  only in
registered  form  without  coupons in  denominations  of $1,000 and any integral
multiple  thereof.   As  provided  in  the  Indenture  and  subject  to  certain
limitations  therein set forth,  the Series B Notes are  exchangeable for a like
aggregate principal amount of Notes of a differing authorized  denomination,  as
requested by the Holder surrendering the same.

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

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

                  THIS NOTE SHALL BE GOVERNED  BY AND  CONSTRUED  IN  ACCORDANCE
WITH THE LAWS OF THE  STATE OF NEW YORK,  WITHOUT  REGARD  TO  CONFLICTS  OF LAW
PRINCIPLES THEREOF.

         All terms used in this Note which are defined in the  Indenture and not
otherwise  defined  herein  shall  have  the  meanings  assigned  to them in the
Indenture.

         [The Transferee Certificate, in the form of Appendix II hereto, will be
attached to the Series B Note.]

                                  ARTICLE III
                                    The Notes

                  Section 3.01. Title and Terms.

                  The  aggregate   principal   amount  of  Notes  which  may  be
authenticated  and delivered  under this Indenture is limited to $600,000,000 in
principal  amount of Notes,  except for Notes  authenticated  and delivered upon
registration  of  transfer  of, or in exchange  for, or in lieu of,  other Notes
pursuant to Section 3.03, 3.04, 3.05,  3.06, 3.07, 3.08, 9.06,  10.12,  10.14 or
11.08.

                  The Notes  shall be known and  designated  as the "10%  Senior
Notes  due 2005" of the  Company.  The  Stated  Maturity  of the Notes  shall be
February 15, 2005, and the Notes shall each bear interest at the rate of 10% per
annum,  as such  interest  rate may be adjusted as set forth in the Notes,  from
April 13, 1998, or from the most recent Interest  Payment Date to which interest
has been paid,  payable  semiannually on August 15 and February 15 in each year,
commencing August 15, 1998, until the principal thereof is paid or duly provided
for.  Interest  on any overdue  principal,  interest  (to the extent  lawful) or
premium, if any, shall be payable on demand.

                  The principal of, premium,  if any, and interest on, the Notes
shall be payable  and the Notes shall be  exchangeable  and  transferable  at an
office or  agency of the  Company  in the City of New York  maintained  for such
purposes  (which  initially  will be the Trustee c/o Harris Trust Company of New
York,  88 Pine  Street,  19th Floor,  Wall Street  Plaza,  New York,  NY 10005);
provided,  however,  that  payment of interest  may be made at the option of the
Company by check mailed to addresses of the Persons entitled thereto as shown on
the Note Register.

                                 Page 51 of 162
<PAGE>


                  For all purposes hereunder,  the Series A Notes and the Series
B Notes  will be  treated  as one  class  and are  together  referred  to as the
"Notes."  The Series A Notes rank pari passu in right of payment with the Series
B Notes.

                  The  Notes  shall be  subject  to  repurchase  by the  Company
pursuant to an Offer as provided in Section 10.12.

                  Holders  shall  have  the  right to  require  the  Company  to
purchase  their Notes,  in whole or in part, in the event of a Change of Control
pursuant to Section 10.14.

                  The Notes shall be redeemable as provided in Article XI and in
the Notes.

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

                  Section 3.02. Denominations.

                  The Notes  shall be  issuable  only in fully  registered  form
without coupons and only in  denominations  of $1,000 and any integral  multiple
thereof.

                  Section 3.03. Execution, Authentication, Delivery and Dating.

                  The Notes shall be executed on behalf of the Company by one of
its Chairman of the Board, its President, its Chief Executive Officer, its Chief
Financial  Officer  or one of its  Vice  Presidents  under  its  corporate  seal
reproduced   thereon   attested  by  its  Secretary  or  one  of  its  Assistant
Secretaries.  The signatures of any of these officers on the Notes may be manual
or facsimile.

                  Notes   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 Notes or did
not hold such offices at the date of such Notes.

                  At any time and from  time to time  after  the  execution  and
delivery  of this  Indenture,  the Company  may  deliver  Notes  executed by the
Company  to the  Trustee  (with or  without  Guarantees  endorsed  thereon)  for
authentication,  together  with a  Company  Order  for  the  authentication  and
delivery of such Notes;  and the Trustee in  accordance  with such Company Order
shall  authenticate  and make  available  for delivery such Notes as provided in
this Indenture and not otherwise.

                  Each Note shall be dated the date of its authentication.

                  No Note or Guarantee endorsed thereon shall be entitled to any
benefit under this  Indenture or be valid or obligatory  for any purpose  unless
there appears on such Note a certificate of authentication  substantially in the
form provided for herein duly executed by the Trustee by manual  signature of an
authorized  officer,  and such  certificate  upon any Note  shall be  conclusive
evidence, and the only evidence,  that such Note has been duly authenticated and
delivered hereunder and is entitled to the benefits of this Indenture.

                  In case the  Company  or any  Guarantor,  pursuant  to Article
VIII,   shall,  in  a  single   transaction  or  through  a  series  of  related
transactions,  be  consolidated or merged with or into any other Person or shall
sell,  assign,  convey,   transfer,   lease  or  otherwise  dispose  of  all  or
substantially all of its 



                                 Page 52 of 162
<PAGE>

properties  and assets to any Person,  and the successor  Person  resulting from
such  consolidation or surviving such merger,  or into which the Company or such
Guarantor  shall have been  merged,  or the  successor  Person  which shall have
participated  in the  sale,  assignment,  conveyance,  transfer,  lease or other
disposition as aforesaid,  shall have executed an indenture  supplemental hereto
with the Trustee  pursuant to Article VIII,  any of the Notes  authenticated  or
delivered prior to such consolidation,  merger,  sale,  assignment,  conveyance,
transfer,  lease or other  disposition may, from time to time, at the request of
the successor  Person,  be exchanged for other Notes 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 Notes  surrendered
for such exchange and of like principal  amount;  and the Trustee,  upon Company
Request  of the  successor  Person,  shall  authenticate  and  deliver  Notes as
specified  in such request for the purpose of such  exchange.  If Notes shall at
any time be  authenticated  and delivered in any new name of a successor  Person
pursuant  to  this  Section  3.03  in  exchange  or  substitution  for  or  upon
registration of transfer of any Notes,  such successor  Person, at the option of
the Holders but without  expense to them,  shall provide for the exchange of all
Notes at the time Outstanding for Notes  authenticated and delivered in such new
name.

                  The Trustee may appoint an authenticating  agent acceptable to
the Company to  authenticate  Notes on behalf of the Trustee.  Unless limited by
the terms of such appointment,  an authenticating  agent may authenticate  Notes
whenever  the  Trustee  may  do  so.  Each   reference  in  this   Indenture  to
authentication  by  the  Trustee  includes  authentication  by  such  agent.  An
authenticating  agent has the same rights as any Note  Registrar or Paying Agent
to deal with the Company and its Affiliates.

         If an officer whose  signature is on a Note no longer holds that office
at the time  the  Trustee  authenticates  such  Note  such  Note  shall be valid
nevertheless.

                  Section 3.04. Temporary Notes.

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

                  If  temporary  Notes  are  issued,   the  Company  will  cause
definitive  Notes  to  be  prepared  without   unreasonable   delay.  After  the
preparation of definitive  Notes,  the temporary Notes shall be exchangeable for
definitive  Notes upon surrender of the temporary  Notes at the office or agency
of the Company  designated for such purpose  pursuant to Section 10.02,  without
charge  to the  Holder.  Upon  surrender  for  cancellation  of any  one or more
temporary Notes, the Company shall execute and the Trustee (in accordance with a
Company Order for the  authentication of such Notes) shall authenticate and make
available  for  delivery  in  exchange  therefor  a  like  principal  amount  of
definitive Notes of authorized  denominations.  Until so exchanged the temporary
Notes  shall in all  respects  be  entitled  to the  same  benefits  under  this
Indenture as definitive Notes.

                  Section  3.05.  Registration,  Registration  of  Transfer  and
Exchange.

                  The Company  shall cause the Trustee to keep, so long as it is
the Note Registrar,  at the Corporate Trust Office of the Trustee, or such other
office as the Trustee may designate, a register (the register maintained in such
office or in any other  office or agency  designated  pursuant to Section  10.02
being herein sometimes referred to as the "Note Register") in which,  subject to
such  reasonable  regulations as the Note  Registrar may prescribe,  the Company
shall  provide for the  registration  of Notes 



                                 Page 53 of 162
<PAGE>

and of transfers of Notes.  The Trustee shall initially be the "Note  Registrar"
for the purpose of registering  Notes and transfers of Notes as herein provided.
The  Company  may  change the Note  Registrar  or  appoint  one or more  co-Note
Registrars  without notice.  

                  Upon surrender for registration of transfer of any Note at the
office or agency of the  Company  designated  pursuant  to  Section  10.02,  the
Company shall execute, and the Trustee shall (in accordance with a Company Order
for the  authentication  of such  Notes)  authenticate  and make  available  for
delivery, in the name of the designated  transferee or transferees,  one or more
new Notes of the same series of any authorized denomination or denominations, of
a like aggregate principal amount.

                  Furthermore,   any  Holder  of  the  Global  Note  shall,   by
acceptance of such Global Note, agree that transfers of beneficial  interests in
such Global Note may be effected only through a book-entry  system maintained by
the  Holder  of such  Global  Note  (or its  agent),  and  that  ownership  of a
beneficial interest in a Note shall be required to be reflected in a book entry.

                  At the option of the Holder,  Notes may be exchanged for other
Notes of any  authorized  denomination  or  denominations,  of a like  aggregate
principal amount,  upon surrender of the Notes to be exchanged at such office or
agency.  Whenever any Notes are so surrendered  for exchange,  the Company shall
execute,  and the  Trustee  shall (in  accordance  with a Company  Order for the
authentication  of such Notes)  authenticate  and make  available  for delivery,
Notes of the same  series  which the Holder  making the  exchange is entitled to
receive;  provided  that  Series A Notes  may be  exchanged  for  Series B Notes
pursuant to the terms of the  Exchange  Offer;  and  provided  further,  that no
exchange  of Series A Notes for Series B Notes  shall  occur  until an  Exchange
Offer  Registration   Statement  shall  have  been  declared  effective  by  the
Commission  and the  Company  shall have  provided  to the Trustee an Opinion of
Counsel that the Exchange Offer Registration Statement is effective.  The Series
A Notes exchanged for Series B Notes shall be canceled.

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

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

                  No  service   charge  shall  be  made  to  a  Holder  for  any
registration of transfer, exchange or redemption of Notes, except for any tax or
other  governmental  charge that may be imposed in connection  therewith,  other
than exchanges  pursuant to Sections 3.03,  3.04, 3.05,  9.06,  10.12,  10.15 or
11.08 not involving any transfer.

                  Neither the Company nor the Trustee  shall be required  (a) to
issue,  register the transfer of or exchange any Note during a period  beginning
at the opening of business 15 days before the mailing of a notice of  redemption
of the Notes selected for redemption under Section 11.04 and ending at the close
of business on the day of such  mailing or (b) to  register  the  transfer of or
exchange any Note so selected  for  redemption  in whole or in part,  except the
unredeemed portion of Notes being redeemed in part.

                  Every Note shall be subject to the  restrictions  on  transfer
provided  in the  legend  required  to be set  forth  on the  face of each  Note
pursuant to Section 2.02, and the  restrictions  set forth in this Section 3.05,
and the Holder of each Note,  by such Holder's  acceptance  thereof (or interest
therein), agrees to be bound by such restrictions on transfer.

                                 Page 54 of 162
<PAGE>


                  Except  as  provided  in the  preceding  paragraph,  any  Note
authenticated  and delivered  upon  registration  of transfer of, or in exchange
for, or in lieu of, any Global  Note,  whether  pursuant to this  Section  3.05,
Section 3.04, 3.08, 9.06 or 11.08 or otherwise,  shall also be a Global Note and
bear the legend specified in Section 2.02.

                  Section 3.06. Book Entry Provisions for Global Notes.

                  (a)      Each  Global  Note initially  shall (i) be registered
in the name of the nominee of the  Depositary,  (ii) be  deposited  with,  or on
behalf of, the Depositary or with the Trustee, as custodian for such Depositary,
and (iii) bear legends as set forth in Section 2.02.

                  Members  of,  or  participants  in,  the  Depositary   ("Agent
Members")  shall have no rights under this  Indenture with respect to any Global
Note held on their behalf by the Depositary, or the Trustee as its custodian, or
under such Global Note, and the  Depositary  may be treated by the Company,  the
Trustee  and any agent of the Company or the  Trustee as the  absolute  owner of
such Global Note for all purposes  whatsoever.  Notwithstanding  the  foregoing,
nothing  herein  shall  prevent  the  Company,  the  Trustee or any agent of the
Company or the Trustee from giving effect to any written certification, proxy or
other authorization  furnished by the Depositary or shall impair, as between the
Depositary and its Agent Members the operation of customary  practices governing
the exercise of the rights of a holder of any Note.

                  (b)      Interests of beneficial owners  in a Global Note may 
be  transferred in accordance  with the  applicable  rules and procedures of the
Depositary and the provisions of Section 3.12.  Transfers of a Global Note shall
be limited to  transfers of such Global Note in whole,  but not in part,  to the
Depositary, its successors or their respective nominees, except (i) as otherwise
provided in Section 3.12,  and (ii)  certificated  notes shall be transferred to
all beneficial  owners in exchange for their beneficial  interests in the Global
Note in the  event  that (A) the  Depositary  notifies  the  Company  that it is
unwilling  or unable to  continue  as  Depositary  for the Global  Notes and the
Company  is unable  to  locate a  qualified  successor  within 90 days,  (B) the
Depositary ceases to be a "Clearing  Agency"  registered under the Exchange Act,
(C) the Company,  at its option,  notifies the Trustee in writing that it elects
to cause the  issuance  of  certificated  Notes,  or (D) an Event of Default has
occurred  and is  continuing  and the  Trustee has  received a request  from the
Depositary.

                  (c)      If any Global Note is to be exchanged for other Notes
or canceled in whole,  it shall be surrendered by or on behalf of the Depositary
or its nominee to the Trustee,  as Note Registrar,  for exchange or cancellation
as provided in this Article III. If any Global Note is to be exchanged for other
Notes or canceled in part,  or if another Note is to be exchanged in whole or in
part for a beneficial  interest in any Global Note,  then either (i) such Global
Note shall be so surrendered  for exchange or  cancellation  as provided in this
Article III or (ii) the principal  amount  thereof shall be reduced or increased
by an amount equal to the portion  thereof to be so  exchanged  or canceled,  or
equal to the  principal  amount  of such  other  Note to be so  exchanged  for a
beneficial  interest  therein,  as the case may be,  by means of an  appropriate
adjustment made on the records of the Trustee, as Note Registrar,  whereupon the
Trustee,  in  accordance  with the  Applicable  Procedures,  shall  instruct the
Depositary or its authorized  representative to make a corresponding  adjustment
to its records.  Upon any such  surrender or  adjustment  of a Global Note,  the
Trustee shall, subject to this Section 3.06(c) and as otherwise provided in this
Article III,  authenticate  and deliver any Notes  issuable in exchange for such
Global Note (or any portion  thereof) to or upon the order of, and registered in
such  names  as  may  be  directed  by,  the   Depositary   or  its   authorized
representative.  Upon  the  request  of  the  Trustee  in  connection  with  the
occurrence  of any of the  events  specified  in the  preceding  paragraph,  the
Company  shall  promptly  make  available to the Trustee a reasonable  supply of
Notes that are not in the form of Global Notes. The Trustee shall be entitled to
rely upon any order,  direction or request of the  Depositary or its  authorized
representative  which is  given or



                                 Page 55 of 162
<PAGE>

made  pursuant to this Article III if such order,  direction or request is given
or made in accordance with the Applicable Procedures.

                  (d)      Every  certificated Note  authenticated and delivered
upon  registration  of transfer  of, or in exchange  for or in lieu of, a Global
Note or any portion thereof,  whether pursuant to this Article III or otherwise,
shall be  authenticated  and  delivered  in the form of,  and shall be, a Global
Note,  unless such certificated Note is registered in the name of a Person other
than the Depositary for such Global Note or a nominee thereof.

                  (e)      The  Depositary or its nominee,  as registered  owner
of a Global Note, shall be the Holder of such Global Note for all purposes under
the Indenture and the Notes, and owners of beneficial interests in a Global Note
shall hold such interests  pursuant to the Applicable  Procedures.  Accordingly,
any such owner's beneficial interest in a Global Note will be shown only on, and
the transfer of such interest shall be effected only through, records maintained
by the Depositary or its nominee or its Participants.

                  Section 3.07. Special Transfer and Exchange Provisions.

                  (a)      Certain   Transfers  and  Exchanges.   Transfers  and
exchanges  of Notes  and  beneficial  interests  in a Global  Note of the  kinds
specified  in this  Section  3.07  shall be made  only in  accordance  with this
Section 3.07.

                           (i)      Rule 144A Global Note to Regulation S Global
Note. If the owner of a beneficial  interest in the Rule 144A Global Note wishes
at any time to transfer such interest to a Person who wishes to acquire the same
in the form of a  beneficial  interest in the  Regulation  S Global  Note,  such
transfer  may be  effected  only  in  accordance  with  the  provisions  of this
paragraph and subject to the Applicable Procedures. Upon receipt by the Trustee,
as Note  Registrar,  of (a) an order given by the  Depositary or its  authorized
representative  directing that a beneficial  interest in the Regulation S Global
Note in a specified  principal  amount be credited to a specified  Participant's
account and that a beneficial  interest in the Rule 144A Global Note in an equal
principal amount be debited from another specified Participant's account and (b)
a Regulation S Certificate in the form of Exhibit A hereto,  satisfactory to the
Trustee and duly executed by the owner of such  beneficial  interest in the Rule
144A Global Note or his attorney duly  authorized in writing,  then the Trustee,
as Note  Registrar,  shall reduce the  principal  amount of the Rule 144A Global
Note and increase the principal  amount of the  Regulation S Global Note by such
specified principal amount as provided in Section 3.06(c).

                           (ii)     Regulation S Global Note to Rule 144A Global
Note.  If the owner of a  beneficial  interest in the  Regulation  S Global Note
wishes at any time to transfer  such  interest to a Person who wishes to acquire
the same in the form of a beneficial interest in the Rule 144A Global Note, such
transfer may be effected only in accordance with this paragraph (ii) and subject
to the Applicable Procedures. Upon receipt by the Trustee, as Note Registrar, of
(a) an order given by the Depositary or its authorized  representative directing
that a beneficial interest in the Rule 144A Global Note in a specified principal
amount be credited to a specified  Participant's  account and that a  beneficial
interest in the Regulation S Global Note in an equal principal amount be debited
from  another  specified  Participant's  account and (b) if such  transfer is to
occur during the Restricted  Period, a Restricted Notes  Certificate in the form
of Exhibit B hereto,  satisfactory to the Trustee and duly executed by the owner
of such beneficial interest in the Regulation S Global Note or his attorney duly
authorized in writing,  then the Trustee,  as Note  Registrar,  shall reduce the
principal  amount of the  Regulation S Global Note and  increase  the  principal
amount  of the Rule  144A  Global  Note by such  specified  principal  amount as
provided in Section 3.06(c).

                                 Page 56 of 162
<PAGE>


                           (iii)    Exchanges between Global Note and Non-Global
Note. A beneficial interest in a Global Note may be exchanged for a Note that is
not a Global  Note as  provided  in  Section  3.07(b),  provided  that,  if such
interest  is a  beneficial  interest in the Rule 144A  Global  Note,  or if such
interest  is a  beneficial  interest  in the  Regulation  S Global Note and such
exchange is to occur during the Restricted Period, then such interest shall bear
the Private Placement Legend (subject in each case to Section 3.07(b)).

                  (b)      Private Placement Legends. Rule 144A  Notes and their
Successor  Notes and Regulation S Notes and their  Successor  Notes shall bear a
Private Placement Legend, subject to the following:

                           (i)      subject  to  the  following  clauses of this
Section 3.07(b), a Note or any portion thereof which is exchanged, upon transfer
or  otherwise,  for a Global Note or any portion  thereof shall bear the Private
Placement Legend borne by such Global Note while represented thereby;

                           (ii)     subject  to  the  following clauses of  this
Section 3.07(b), a new Note which is not a Global Note and is issued in exchange
for another Note (including a Global Note) or any portion thereof, upon transfer
or otherwise, shall bear the Private Placement Legend borne by such other Note;

                           (iii)    Series B Notes, and all other Notes  sold or
otherwise disposed of pursuant to an effective  registration statement under the
Securities Act, together with their respective Successor Notes, shall not bear a
Private Placement Legend;

                           (iv)     at any  time after the  Notes may be  freely
transferred  without  registration  under the  Securities  Act or without  being
subject to  transfer  restrictions  pursuant to the  Securities  Act, a new Note
which does not bear a Private  Placement Legend may be issued in exchange for or
in lieu of a Note (other than a Global Note) or any portion  thereof which bears
such a legend if the Trustee  has  received an  Unrestricted  Notes  Certificate
substantially  in the form of Exhibit C hereto,  satisfactory to the Trustee and
duly  executed  by the  Holder  of  such  legended  Note  or his  attorney  duly
authorized in writing, and after such date and receipt of such certificate,  the
Trustee  shall  authenticate  and deliver  such a new Note in exchange for or in
lieu of such other Note as provided in this Article III;

                           (v)      a  new  Note which does not  bear a  Private
Placement  Legend may be issued in exchange for or in lieu of a Note (other than
a Global  Note) or any  portion  thereof  which  bears  such a legend if, in the
Company's judgment, placing such a legend upon such new Note is not necessary to
ensure compliance with the registration  requirements of the Securities Act, and
the Trustee,  at the direction of the Company,  shall  authenticate  and deliver
such a new Note as provided in this Article III; and

                           (vi)     notwithstanding  the foregoing provisions of
this Section 3.07(b), a Successor Note of a Note that does not bear a particular
form of Private  Placement  Legend shall not bear such form of legend unless the
Company  has  reasonable  cause  to  believe  that  such  Successor  Note  is  a
"restricted security" within the meaning of Rule 144, in which case the Trustee,
at the  direction  of the  Company,  shall  authenticate  and deliver a new Note
bearing a  Private  Placement  Legend in  exchange  for such  Successor  Note as
provided in this Article III. By its  acceptance of any Note bearing the Private
Placement  Legend,  each Holder of such a Note  acknowledges the restrictions on
transfer of such Note set forth in this  Indenture and in the Private  Placement
Legend and  agrees  that it will  transfer  such Note only as  provided  in this
Indenture

                                 Page 57 of 162
<PAGE>


                  The Note Registrar shall retain copies of all letters, notices
and other  written  communications  received  pursuant  to Section  3.06 or this
Section 3.07. 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 written notice to the Note Registrar.

                  In the event that  Regulation S is amended  during the term of
this Indenture to alter the  applicable  holding  period,  all reference in this
Indenture  to a holding  period for  Non-U.S.  Persons will be deemed to include
such amendment.

                  Section 3.08. Mutilated, Destroyed, Lost and Stolen Notes.

                  If (a) any mutilated Note is  surrendered  to the Trustee,  or
(b) the Company and the Trustee  receive  evidence to their  satisfaction of the
destruction,  loss or theft of any Note,  and there is delivered to the Company,
any Guarantor or the Trustee,  such security or indemnity,  in each case, as may
be  required  by them to save each of them  harmless,  then,  in the  absence of
notice to the  Company,  any  Guarantor  or the Trustee  that such Note has been
acquired by a bona fide purchaser,  the Company shall execute and upon a Company
Request the Trustee shall  authenticate  and make  available  for  delivery,  in
exchange for any such mutilated Note or in lieu of any such  destroyed,  lost or
stolen Note, a replacement  Note of like tenor and principal  amount,  bearing a
number not contemporaneously outstanding.

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

                  Upon the issuance of any replacement Notes under this Section,
the Company may require the payment of a sum sufficient to pay all  documentary,
stamp or similar issue or transfer taxes or other governmental  charges that may
be imposed in relation  thereto and any other  expenses  (including the fees and
expenses of the Trustee) connected therewith.

                  Every replacement Note issued pursuant to this Section in lieu
of any destroyed,  lost or stolen Note shall  constitute an original  additional
contractual  obligation  of the  Company and any  Guarantor,  whether or not the
destroyed,  lost or stolen Note 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 Notes 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 Notes.

                  Section 3.09. Payment of Interest; Interest Rights Preserved.

                  Interest on any Note which is payable,  and is punctually paid
or duly provided for, on the Stated  Maturity of such interest  shall be paid to
the Person in whose name the Note (or any  Predecessor  Notes) is  registered at
the close of business on the Regular Record Date for such interest payment.

                  Any  interest  on  any  Note  which  is  payable,  but  is not
punctually  paid or duly provided for, on the Stated  Maturity of such interest,
and interest on such  defaulted  interest at the then  applicable  interest rate
borne by the Notes, to the extent lawful (such  defaulted  interest and interest
thereon herein collectively called "Defaulted Interest"),  shall forthwith cease
to be payable to the  Holder on the  Regular  Record  Date;  and such  Defaulted
Interest may be paid by the Company,  at its election in each case,  as provided
in Subsection (a) or (b) below:

                                 Page 58 of 162
<PAGE>


                  (a)      The  Company   may  elect  to  make  payment  of  any
Defaulted  Interest  to the  Persons in whose  names the Notes (or any  relevant
Predecessor  Notes) 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 Note and the date (not less
than 30 days after such notice) of the proposed  payment (the  "Special  Payment
Date"),  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 Special Payment Date, such money when deposited to
be held in trust for the  benefit  of the  Persons  entitled  to such  Defaulted
Interest as in this  Subsection  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 Special
Payment  Date 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 in
writing  of such  Special  Record  Date.  In the name and at the  expense of the
Company,  the  Trustee  shall  cause  notice  of the  proposed  payment  of such
Defaulted   Interest  and  the  Special  Record  Date  therefor  to  be  mailed,
first-class  postage prepaid, to each Holder at its address as it appears in the
Note Register,  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
and Special Payment Date therefor having been so mailed, such Defaulted Interest
shall be paid to the  Persons in whose  names the Notes are  registered  on such
Special  Record Date and shall no longer be payable  pursuant  to the  following
Subsection (b).

                  (b)      The  Company   may   make  payment of  any  Defaulted
Interest in any other lawful manner not  inconsistent  with the  requirements of
any securities  exchange on which the Notes may be listed,  and upon such notice
as may be required by this Indenture not  inconsistent  with the requirements of
such  exchange,  if, after written notice given by the Company to the Trustee of
the proposed payment  pursuant to this Subsection,  such payment shall be deemed
practicable by the Trustee.  Subject to the foregoing provisions of this Section
3.09, each Note delivered under this Indenture upon  registration of transfer of
or in  exchange  for or in lieu of any other  Note  shall  carry  the  rights to
interest  accrued and unpaid,  and to accrue,  which were  carried by such other
Note.

                  Section 3.10. CUSIP Numbers.

                  The Company in issuing  the Notes may use "CUSIP"  numbers (if
then  generally  in use),  and the  Company,  or the  Trustee  on  behalf of the
Company,  shall use CUSIP  numbers in notices of  redemption  or  exchange  as a
convenience to Holders; provided, however, that any such notice shall state that
no  representation  is made as to the  correctness  of such  numbers  either  as
printed on the Notes or as contained in any notice of redemption or exchange and
that reliance may be placed only on the other identification  numbers printed on
the Notes; and provided further,  however,  that failure to use CUSIP numbers in
any  notice  of  redemption  or  exchange  shall  not  affect  the  validity  or
sufficiency of such notice.

                  Section 3.11. Persons Deemed Owners.

                  Prior  to  due  presentment  of a  Note  for  registration  of
transfer, the Company, any Guarantor,  the Trustee and any agent of the Company,
any  Guarantor  or the  Trustee  may treat the  Person in whose name any Note is
registered  as the owner of such Note for the  purpose of  receiving  payment of
principal of,  premium,  if any, and (subject to Section 3.09) interest on, such
Note and for all other purposes whatsoever, whether or not such Note is overdue,
and  neither  the  Company,  any  Guarantor,  the  Trustee  nor any agent of the
Company,  any  Guarantor  or the  Trustee  shall be  affected  by  notice to the
contrary.

                                 Page 59 of 162
<PAGE>


                  Section 3.12. Cancellation.

                  All  Notes  surrendered  for  payment,  purchase,  redemption,
registration  of transfer or exchange  shall be delivered to the Trustee and, if
not  already  canceled,  shall be  promptly  canceled by it. The Company and any
Guarantor  may at any time  deliver to the  Trustee for  cancellation  any Notes
previously  authenticated  and  delivered  hereunder  which the  Company or such
Guarantor may have acquired in any manner whatsoever, and all Notes so delivered
shall be promptly  canceled by the Trustee.  No Notes shall be  authenticated in
lieu of or in exchange for any Notes  canceled as provided in this Section 3.12,
except as expressly permitted by this Indenture.  All canceled Notes held by the
Trustee shall,  at the option of the Trustee,  be (a) returned to the Company or
(b)  destroyed,  in which case the Trustee shall  provide a  certificate  to the
Company  identifying  the Notes that have been  destroyed..  The  Trustee  shall
provide  the  Company a list of all Notes that have been  canceled  from time to
time as requested by the Company.

                  Section 3.13. Computation of Interest.

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

                                   ARTICLE IV
                       Defeasance and Covenant Defeasance

                  Section  4.01.   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 Notes,  elect to have either  Section 4.02 or Section
4.03 be applied to all of the  Outstanding  Notes (the "Defeased  Notes"),  upon
compliance with the conditions set forth below in this Article IV.

                  Section 4.02. Defeasance and Discharge.

                  Upon the Company's  exercise  under Section 4.01 of the option
applicable  to this Section  4.02,  the Company,  each  Guarantor  and any other
obligor upon the Notes, if any, shall be deemed to have been discharged from its
obligations  with respect to the Defeased  Notes on the date the  conditions set
forth in Section 4.04 below are satisfied (hereinafter,  "defeasance"). For this
purpose,  such defeasance  means that the Company,  each Guarantor and any other
obligor  upon the Notes shall be deemed to have paid and  discharged  the entire
Indebtedness represented by the Defeased Notes, which shall thereafter be deemed
to be "Outstanding" only for the purposes of Section 4.05 and the other Sections
of this  Indenture  referred to in (a) and (b) below,  and to have satisfied all
its other  obligations under such Notes and this Indenture insofar as such Notes
are concerned  (and the Trustee,  at the expense of the Company and upon Company
Request,  shall execute proper instruments  acknowledging the same),  except for
the  following  which shall  survive  until  otherwise  terminated or discharged
hereunder:  (a) the rights of Holders of Defeased Notes to receive,  solely from
the trust fund  described  in  Section  4.04 and as more fully set forth in such
Section,  payments in respect of the principal of, premium, if any, and interest
on, such Notes,  when such payments are due, (b) the Company's  obligations with
respect to such Defeased Notes under Sections 3.04, 3.05, 3.08, 10.02 and 10.03,
(c) the rights,  powers, trusts, duties and immunities of the Trustee hereunder,
including,  without limitation, the Trustee's rights under Section 6.07, and (d)
this  Article IV.  Subject to  compliance  with this Article IV, the Company may
exercise its option under this Section 4.02  notwithstanding  the prior exercise
of its option under Section 4.03 with respect to the Notes.

                                 Page 60 of 162
<PAGE>


                  Section 4.03. Covenant Defeasance.

                  Upon the Company's  exercise  under Section 4.01 of the option
applicable  to this  Section  4.03,  the  Company  and each  Guarantor  shall be
released  from its  obligations  under any  covenant or  provision  contained or
referred to in Sections  10.05 through 10.22,  inclusive,  and the provisions of
clauses (iii) and (v) of Section  8.01(a) with respect to the Defeased  Notes on
and after the date the  conditions set forth in Section 4.04 below are satisfied
(hereinafter, "covenant defeasance"), and the Defeased Notes shall thereafter be
deemed  to be not  "Outstanding"  for the  purposes  of any  direction,  waiver,
consent or declaration or Act of Holders (and the  consequences  of any thereof)
in connection with such covenants, but shall continue to be deemed "Outstanding"
for all other purposes  hereunder.  For this purpose,  such covenant  defeasance
means that, with respect to the Defeased  Notes,  the Company and each Guarantor
may omit to comply  with and shall  have no  liability  in  respect of any term,
condition  or  limitation  set forth in any such  Section,  whether  directly or
indirectly,  by reason of any reference  elsewhere herein to any such Section or
by reason of any reference in any such Section to any other provision  herein or
in any other document and such omission to comply shall not constitute a Default
or an Event of Default under Section 5.01(c) but, except as specified above, the
remainder of this Indenture and such Defeased Notes shall be unaffected thereby.

                  Section 4.04. Conditions to Defeasance or Covenant Defeasance.

                  The following shall be the conditions to application of either
Section 4.02 or Section 4.03 to the Defeased Notes:

                  (a)      The  Company  shall  irrevocably  have  deposited  or
caused to be deposited  with the Trustee 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  Notes,  (1) cash in
United States dollars,  (2) U.S.  Government  Obligations,  or (3) a combination
thereof,  in such amounts as will be sufficient,  in the opinion of a nationally
recognized  firm of independent  public  accountants or a nationally  recognized
investment banking firm expressed in a written  certification  thereof delivered
to the Trustee, to pay and discharge,  and which shall be applied by the Trustee
to pay and discharge,  the principal of,  premium,  if any, and interest on, the
Defeased  Notes, on the Stated Maturity of such principal or interest (or on any
date after  February  15, 2002 (such date being  referred to as the  "Defeasance
Redemption  Date"),  if at or prior to electing  to  exercise  either its option
applicable to Section 4.02 or its option applicable to Section 4.03, the Company
has delivered to the Trustee an irrevocable  notice to redeem the Defeased Notes
on  the  Defeasance  Redemption  Date).  For  this  purpose,   "U.S.  Government
Obligations"  means  securities  that are (I) direct  obligations  of the United
States of America  for the timely  payment of which its full faith and credit is
pledged or (II)  obligations of a Person  controlled or supervised by and acting
as an agency or  instrumentality  of the  United  States of  America  the timely
payment  of which is  unconditionally  guaranteed  as a full  faith  and  credit
obligation  by the United  States of America,  which,  in either  case,  are not
callable  or  redeemable  at the  option of the issuer  thereof,  and shall also
include a depository  receipt issued by a bank (as defined in Section 3(a)(2) of
the  Securities  Act),  as custodian  with  respect to any such U.S.  Government
Obligation  or a specific  payment of  principal of or interest on any such U.S.
Government  Obligation  held by such  custodian for the account of the holder of
such  depository  receipt,  provided  that  (except  as  required  by law)  such
custodian is not authorized to make any deduction from the amount payable to the
holder of such  depository  receipt from any amount received by the custodian in
respect of the U.S.  Government  Obligation or the specific payment of principal
of or interest on the U.S.  Government  Obligation  evidenced by such depository
receipt;

                  (b)      In  the  case  of an election under Section 4.02, the
Company shall have delivered to the Trustee an Opinion of Independent Counsel in
the United States  stating that (1) the Company has received  from, or there has
been published by, the Internal  Revenue  Service a ruling or (2) since the date


                                 Page 61 of 162
<PAGE>

hereof,  there has been a change in the  applicable  federal  income tax law, in
either case to the effect that,  and based  thereon such Opinion of  Independent
Counsel in the United States shall confirm that, the Holders of the  Outstanding
Notes 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;

                  (c)      In the case of  an  election  under Section 4.03, the
Company shall have delivered to the Trustee an Opinion of Independent Counsel in
the United States to the effect that the Holders of the  Outstanding  Notes 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;

                  (d)      No Default or Event of Default (other  than a Default
or Event of Default under this  Indenture  resulting from the borrowing of funds
to be applied to such deposit) shall have occurred and be continuing on the date
of such deposit or insofar as Section  5.01(h) or (i) is concerned,  at any time
during  the period  ending on the 91st day after the date of  deposit  (it being
understood  that  this  condition  shall  not  be  deemed  satisfied  until  the
expiration of such period);

                  (e)      Such  defeasance  or  covenant defeasance  shall  not
cause the Trustee for the Notes to have a  conflicting  interest for purposes of
the Trust  Indenture Act with respect to any other  securities of the Company or
any Guarantor;

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

                  (g)      Such   defeasance  or  covenant  defeasance shall not
result in the trust arising from such deposit constituting an investment company
within the meaning of the  Investment  Company Act of 1940,  as amended,  unless
such  trust  shall be  registered  under  such Act or exempt  from  registration
thereunder;

                  (h)      The  Company shall  have  delivered to the Trustee an
Opinion of Independent Counsel in the United States to the effect that after the
91st day  following  the  deposit,  the trust  funds  will not be subject to the
effect of any applicable bankruptcy, insolvency,  reorganization or similar laws
affecting creditors' rights generally;

                  (i)      The  Company  shall  have  delivered  to the  Trustee
an  Officers'  Certificate  stating that the deposit was not made by the Company
with the intent of preferring the holders of the Notes or any Guarantee over the
other  creditors of the Company or any  Guarantor  with the intent of defeating,
hindering,  delaying or  defrauding  creditors of the Company,  any Guarantor or
others;

                  (j)      No event or condition shall exist that would  prevent
the Company  from making  payments of the  principal  of,  premium,  if any, and
interest  on the Notes on the date of such  deposit or at any time ending on the
91st day after the date of such

deposit; and

                  (k)      The  Company  shall  have  delivered  to the  Trustee
an Officers'  Certificate  and an Opinion of Independent  Counsel,  each stating
that all  conditions  precedent  provided for relating to either the  defeasance
under  Section 4.02 or the covenant  defeasance  under Section 4.03 (as the case
may be) have been complied with.  Opinions of Counsel or Opinions of Independent
Counsel  required  to be  



                                 Page 62 of 162
<PAGE>


delivered  under  this  Section  shall  be  in  form  and  substance  reasonably
satisfactory  to the Trustee may have  qualifications  customary for opinions of
the type required and counsel  delivering such opinions may rely on certificates
of the Company or  government or other  officials  customary for opinions of the
type  required,  which  certificates  shall be  limited  as to  matters of fact,
including that various financial covenants have been complied with.

                  Section 4.05. Deposited Money and U.S. Government  Obligations
to Be Held in Trust; Other Miscellaneous Provisions.

                  Subject to the  provisions  of the last  paragraph  of Section
10.03, all United States dollars and U.S. Government  Obligations (including the
proceeds thereof) deposited with the Trustee pursuant to Section 4.04 in respect
of the  Defeased  Notes  shall be held in trust and applied by the  Trustee,  in
accordance with the provisions of such Notes and this Indenture, to the payment,
either directly or through any Paying Agent (excluding the Company or any of its
Affiliates acting as Paying Agent), as the Trustee may determine, to the Holders
of such Notes of all sums due and to become due thereon in respect of principal,
premium, if any, and interest,  but such money need not be segregated from other
funds except to the extent required by law.

                  The Company shall pay and  indemnify  the Trustee  against any
tax,  fee or other  charge  imposed on or assessed  against the U.S.  Government
Securities  deposited  pursuant to Section  4.04 or the  principal  and interest
received in respect  thereof  other than any such tax, fee or other charge which
by law is imposed,  assessed  or for the account of the Holders of the  Defeased
Notes.

                  Anything in this Article IV to the  contrary  notwithstanding,
the Trustee  shall  deliver or pay to the Company from time to time upon Company
Request any United States dollars or U.S.  Government  Securities  held by it as
provided in Section 4.04 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 defeasance or covenant defeasance.

                  Section 4.06. Reinstatement.

                  If the  Trustee or Paying  Agent is unable to apply any United
States dollars or U.S. Government Obligations in accordance with Section 4.02 or
4.03,  as the case may be, by reason  of any order or  judgment  of any court or
governmental  authority  enjoining,  restraining or otherwise  prohibiting  such
application,  then the Company's  obligations under this Indenture and the Notes
and any  Guarantor's  obligations  under  any  Guarantee  shall be  revived  and
reinstated,  with  present  and  prospective  effect,  as though no deposit  had
occurred  pursuant to Section 4.02 or 4.03,  as the case may be, until such time
as the Trustee or Paying  Agent is  permitted  to apply all such  United  States
dollars or U.S. Government  Obligations in accordance with Section 4.02 or 4.03,
as the case may be; provided,  however, that if the Company makes any payment to
the Trustee or Paying Agent of principal of, premium, if any, or interest on any
Note following the reinstatement of its obligations, the Trustee or Paying Agent
shall  promptly  pay any such amount to the Holders of the Notes and the Company
shall be  subrogated  to the rights of the Holders of such Notes to receive such
payment from the United States dollars and U.S.  Government  Obligations held by
the Trustee or Paying Agent.

                                 Page 63 of 162
<PAGE>



                                   ARTICLE V
                                    Remedies

                  Section 5.01. 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):

                  (a)      there shall  be  a default  in  the  payment  of  any
interest on any Note when it becomes due and  payable,  and such  default  shall
continue for a period of 30 days;

                  (b)      there  shall  be  a  default  in  the  payment of the
principal  of  (or  premium,  if  any,  on)  any  Note  at  its  Maturity  (upon
acceleration,   optional  or  mandatory   redemption,   required  repurchase  or
otherwise);

                  (c)      (i)  there  shall  be  a  default in the performance,
or breach,  of any covenant or agreement of the Company or any  Guarantor  under
this Indenture,  the Escrow Agreement,  the Registration Rights Agreement or any
Guarantee (other than a default in the performance,  or breach, of a covenant or
agreement which is specifically dealt with in clause (a), (b) or in clause (ii),
(iii) or (iv) of this clause (c)) and such default or breach shall  continue for
a period of 30 days after written notice has been given,  by certified mail, (x)
to the  Company by the  Trustee  or (y) to the  Company  and the  Trustee by the
Holders of at least 25% in aggregate  principal amount of the outstanding Notes;
(ii) there shall be a default in the  performance or breach of the provisions of
Article VIII; (iii) the Company shall have failed to make or consummate an Offer
in accordance  with the provisions of Section  10.12;  or (iv) the Company shall
have failed to make or consummate a Change of Control  Offer in accordance  with
the provisions of Section 10.14;

                  (d)      (i)      any default by the Company or any Subsidiary
in the payment of the principal,  premium, if any, or interest has occurred with
respect to amounts in excess of $10 million  under any  agreement,  indenture or
instrument evidencing Indebtedness when the same shall become due and payable in
full and such default shall have continued after any applicable grace period and
shall not have been cured or waived  and,  if not  already  matured at its final
maturity in accordance  with its terms,  the holder of such  Indebtedness  shall
have the right to accelerate  such  Indebtedness or (ii) any event of default as
defined in any  agreement,  indenture or  instrument  of the Company  evidencing
Indebtedness  in excess of $10 million shall have occurred and the  Indebtedness
thereunder,  if not already matured at its final maturity in accordance with its
terms, shall have been accelerated;

                  (e)      any  Guarantee  shall for any reason cease to be, or 
shall for any reason be asserted in writing by any  Guarantor or the Company not
to be, in full force and effect and  enforceable  in accordance  with its terms,
except to the extent contemplated by this Indenture and any such Guarantee;

                  (f)      one or  more  judgments,  orders  or decrees for  the
payment  of  money in  excess  of $10  million,  either  individually  or in the
aggregate,  shall  be  rendered  against  the  Company  not paid or  covered  by
financially  sound  third- party  insurers,  or any  Subsidiary  or any of their
respective  properties  and is not discharged and there shall have been a period
of 60  consecutive  days during which a stay of  enforcement of such judgment or
order, by reason of an appeal or otherwise, shall not be in effect;

                  (g)      any  holder or holders of   at least $10  million  in
aggregate  principal  amount of  Indebtedness  of the Company or any  Subsidiary
after a  default  under  such  Indebtedness  shall  notify  the  



                                 Page 64 of 162
<PAGE>

Trustee of its  commencement  of  proceedings  to foreclose on any assets of the
Company or any  Subsidiary  that have been pledged to or for the benefit of such
holder or holders to secure such Indebtedness or shall commence proceedings,  or
take any action (including by way of set-off), to retain in satisfaction of such
Indebtedness  or to collect on, seize,  dispose of or apply in  satisfaction  of
Indebtedness,  assets  of the  Company  or any  Subsidiary  (including  funds on
deposit or held pursuant to lock- box and other similar arrangements);

                  (h)      there  shall  have  been  the  entry  by  a  court of
competent  jurisdiction  of (i) a decree or order for  relief in  respect of the
Company or any Significant Subsidiary in an involuntary case or proceeding under
any applicable Bankruptcy Law or (ii) a decree or order adjudging the Company or
any Significant  Subsidiary  bankrupt or insolvent,  or seeking  reorganization,
arrangement,  adjustment or  composition  of or in respect of the Company or any
Significant  Subsidiary under any applicable federal or state law, or appointing
a custodian,  receiver,  liquidator,  assignee, trustee,  sequestrator (or other
similar  official)  of the  Company  or  any  Significant  Subsidiary  or of any
substantial part of their respective  properties,  or ordering the winding up or
liquidation of their respective affairs, and any such decree or order for relief
shall  continue  to be in  effect,  or any such other  decree or order  shall be
unstayed and in effect, for a period of 60 consecutive days; or

                  (i)      the  Company or any Significant Subsidiary  commences
a voluntary case or proceeding under any applicable  Bankruptcy Law or any other
case or proceeding to be adjudicated bankrupt or insolvent,  (ii) the Company or
any Significant Subsidiary consents to the entry of a decree or order for relief
in respect of the Company or such Significant  Subsidiary in an involuntary case
or proceeding under any applicable  Bankruptcy Law or to the commencement of any
bankruptcy or insolvency case or proceeding against it, (iii) the Company or any
Significant   Subsidiary   files  a  petition  or  answer  or  consent   seeking
reorganization  or relief under any  applicable  federal or state law,  (iv) the
Company  or any  Significant  Subsidiary  (1)  consents  to the  filing  of such
petition or the appointment of, or taking possession by, a custodian,  receiver,
liquidator,  assignee, trustee,  sequestrator or similar official of the Company
or such  Significant  Subsidiary  or of any  substantial  part of the  Company's
Consolidated properties, (2) makes an assignment for the benefit of creditors or
(3) admits in writing its  inability  to pay its debts  generally as they become
due or (v) the Company or any Significant  Subsidiary takes any corporate action
in furtherance of any such actions in this paragraph (i); or

                  (j)      the Company  challenges the Lien on the  Collateral  
under  the  Escrow  Agreement  prior  to such  time as the  Collateral  is to be
released to the Company, or the Escrow Agreement becomes, or the Company asserts
that the Escrow  Agreement  is,  invalid  or  unenforceable,  otherwise  than in
accordance with its terms.

                  Section  5.02.   Acceleration  of  Maturity;   Rescission  and
Annulment.

                  (a)      If  an  Event  of  Default  (other  than  an Event of
Default specified in Sections 5.01(h) and (i) with respect to the Company) shall
occur and be  continuing  with  respect to this  Indenture,  the  Trustee or the
Holders  of not less than 25% in  aggregate  principal  amount of the Notes then
Outstanding  may, and the Trustee at the request of such Holders shall,  declare
all unpaid  principal of, premium,  if any, and accrued interest on all Notes to
be due and payable, by a notice in writing to the Company (and to the Trustee if
given  by the  Holders  of the  Notes)  and  upon  any  such  declaration,  such
principal,   premium,  if  any,  and  interest  shall  become  due  and  payable
immediately.  If an Event of Default  specified  in clause (h) or (i) of Section
5.01 occurs with  respect to the Company and is  continuing,  then all the Notes
shall ipso facto become and be due and payable immediately in an amount equal to
the principal amount of the Notes, together with accrued and unpaid interest, if
any, to the date the Notes become due and payable,  without any  declaration  or
other act on the part of the Trustee or any 



                                 Page 65 of 162
<PAGE>

Holder.  Thereupon,  the Trustee may, at its discretion,  proceed to protect and
enforce  the  rights  of  the  Holders  of the  Notes  by  appropriate  judicial
proceedings.

                  (b)      After a declaration  of  acceleration with respect to
the Notes, but before a judgment or decree for payment of the money due has been
obtained by the Trustee as hereinafter in this Article provided,  the Holders of
a majority in aggregate  principal amount of the Notes  Outstanding,  by written
notice to the Company and the  Trustee,  may rescind and annul such  declaration
and its consequences if:
                           (i)      the Company has paid or deposited with the 
Trustee a sum sufficient to pay:

                                    (1)     all  sums  paid or  advanced  by the
Trustee  under  this  Indenture  and  the  reasonable  compensation,   expenses,
disbursements and advances of the Trustee, its agents and counsel,

                                    (2)     all    overdue   interest   on   all
Outstanding Notes,

                                    (3) the principal of and premium, if any, on

any Outstanding  Notes which have become due otherwise than by such  declaration
of acceleration and interest thereon at a rate borne by the Notes, and

                                    (4)     to  the  extent that payment of such
interest  is lawful,  interest  upon  overdue  interest at the rate borne by the
Notes; and

                           (ii)     all  Events  of  Default,  other   than  the
non-payment  of  principal  of the Notes  which  have  become due solely by such
declaration  of  acceleration,  have been cured or waived as provided in Section
5.13. No such rescission shall affect any subsequent Default or impair any right
consequent thereon.

                  (c)      The Company shall notify the Trustee within 30 days 
of the occurrence of any Default unless such Default shall have been cured.  The
Company shall deliver to the Trustee,  on or before a date not more than 60 days
after the end of each fiscal quarter and not more than 120 days after the end of
each fiscal  year,  a written  statement as to  compliance  with the  Indenture,
including whether or not any default has occurred that is not cured.

                  Section  5.03.   Collection  of  Indebtedness  and  Suits  for
Enforcement by Trustee.

                  The Company and each Guarantor covenant that if

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

                  (b)      default  is made in the  payment of the  principal of
or premium, if any, on any Note at the Stated Maturity thereof,  the Company and
such Guarantor will,  upon demand of the Trustee,  pay to it, for the benefit of
the Holders of such Notes,  the whole  amount then due and payable on such Notes
for principal and premium, if any, and interest,  with interest upon the overdue
principal and premium,  if any, and, to the extent that payment of such interest
shall be legally enforceable, upon overdue installments of interest, at the rate
borne by the Notes;  and, in addition  thereto,  such further amount as shall be
sufficient  to cover  the  costs  and  expenses  of  collection,  including  the
reasonable  compensation,  expenses,  disbursements and advances of the Trustee,
its agents and counsel.

                                 Page 66 of 162
<PAGE>


                  If the Company or any Guarantor,  as the case may be, fails to
pay such amounts forthwith upon such demand, the Trustee, in its own name and as
trustee  of an express  trust,  may  institute  a  judicial  proceeding  for the
collection  of the sums so due and unpaid and may prosecute  such  proceeding to
judgment or final  decree,  and may enforce the same  against the Company or any
Guarantor or any other obligor upon the Notes and collect the moneys adjudged or
decreed to be payable in the manner  provided by law out of the  property of the
Company, any Guarantor or any other obligor upon the Notes, 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 under this  Indenture,  the Escrow  Agreement or any Guarantee by
such appropriate private or judicial  proceedings as the Trustee shall deem most
effectual to protect and enforce such rights, including seeking recourse against
any Guarantor  pursuant to the terms of any Guarantee,  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 therein,  or to enforce any other proper
remedy,  including,  without limitation,  seeking recourse against any Guarantor
pursuant to the terms of a  Guarantee,  or to enforce any other  proper  remedy,
subject  however to Section  5.12.  No  recovery of any such  judgment  upon any
property  of the  Company or any  Guarantor  shall  affect or impair any rights,
powers or remedies of the Trustee or the Holders.

                  Section 5.04. 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,
including  any  Guarantor,  upon the Notes or the  property of the Company or of
such other obligor or their creditors,  the Trustee (irrespective of whether the
principal of the Notes shall then be due and payable as therein  expressed or by
declaration or otherwise and irrespective of whether the Trustee shall have made
any demand on the  Company  for the payment of overdue  principal  or  interest)
shall  be  entitled  and  empowered,  by  intervention  in  such  proceeding  or
otherwise,

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

                  (b)      to collect and receive  any  moneys or other property
payable or  deliverable  on any such claims and to distribute  the same; and any
custodian,  receiver,  assignee,  trustee,  liquidator,  sequestrator or 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, its agents and counsel, and any other
amounts due the Trustee under Section 6.07.

                  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
Notes 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

                                 Page 67 of 162
<PAGE>


                  Section 5.05. Trustee May Enforce Claims without Possession of
Notes.

                  All  rights of action and claims  under  this  Indenture,  the
Notes or the Guarantees  may be prosecuted  and enforced by the Trustee  without
the possession of any of the Notes 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, its agents and counsel, be
for the  ratable  benefit  of the  Holders of the Notes in respect of which such
judgment has been recovered.

                  Section 5.06. Application of Money Collected.

                  Any money collected by the Trustee pursuant to this Article or
the Escrow  Agreement  or  otherwise  on behalf of the  Holders  or the  Trustee
pursuant to this Article or the Escrow  Agreement or through any  proceeding  or
any  arrangement or  restructuring  in anticipation or in lieu of any proceeding
contemplated by this Article or the Escrow  Agreement shall be applied,  subject
to  applicable  law, in the following  order,  at the date or dates fixed by the
Trustee and, in case of the  distribution of such money on account of principal,
premium,  if any, or interest,  upon  presentation of the Notes 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 6.07 and to the Escrow Agent pursuant to the Escrow Agreement;

                  SECOND:  To the  payment  of  the  amounts then due and unpaid
upon the Notes for principal, premium, if any, and interest, 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 Notes for principal, premium, if any, and interest; and

                  THIRD:   The  balance,  if  any,  to  the  Person  or  Persons
entitled thereto, including the Company, provided that all sums due and owing to
the Holders, the Trustee and the Escrow Agent have been paid in full as required
by this Indenture.

                  Section 5.07. Limitation on Suits.

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

                  (a)      such Holder has previously  given  written  notice to
the Trustee of a continuing Event of Default and

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

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

                  (d)      the  Trustee  for  30 days after  its receipt of such
notice, request and offer (and if requested,  provision) of indemnity has failed
to institute any such proceeding; and

                                 Page 68 of 162
<PAGE>


                  (e)      no direction  inconsistent  with such written request
has been given to the  Trustee  during  such  30-day  period by the Holders of a
majority in principal  amount of the Outstanding  Notes; it being understood and
intended that no one or more Holders shall have any right in any manner whatever
by virtue of, or by availing of, any  provision of this  Indenture,  any Note or
any Guarantee 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, any Note or any Guarantee,  except
in the manner  provided in this Indenture and for the equal and ratable  benefit
of all the Holders.

                  Section  5.08.  Unconditional  Right  of  Holders  to  Receive
Principal, Premium and Interest.

                  Notwithstanding  any other  provision in this  Indenture,  the
Holder of any Note shall have the right based on the terms stated herein,  which
is absolute and unconditional,  to receive payment of the principal of, premium,
if any, and (subject to Section  3.09)  interest on such Note on the  respective
Stated  Maturities  expressed  in such Note (or,  in the case of  redemption  or
repurchase, on the Redemption Date or the repurchase 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 5.09. Restoration of Rights and Remedies.

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

                  Section 5.10. Rights and Remedies Cumulative.

                  No right or remedy  herein  conferred  upon or reserved to the
Trustee or to the  Holders is  intended  to be  exclusive  of any other right or
remedy,  and every right and remedy  shall,  to the extent  permitted by law, be
cumulative  and in addition to every other right and remedy  given  hereunder or
now or hereafter  existing at law or in equity or  otherwise.  The  assertion or
employment of any right or remedy hereunder, or otherwise, shall not prevent the
concurrent assertion or employment of any other appropriate right or remedy.

                  Section 5.11. Delay or Omission Not Waiver.

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

                  Section 5.12. Control by Holders.

                  The Holders of not less than a majority in aggregate principal
amount of the Outstanding  Notes shall have the right to direct the time, method
and place of conducting any  proceeding  for exercising any remedy  available to
the Trustee, or exercising any trust or power conferred on the Trustee, provided
that

                                 Page 69 of 162
<PAGE>


                  (a)      such direction shall not be in conflict with any rule
of law or with this Indenture (including, without limitation, Section 5.07), the
Escrow Agreement or any Guarantee,  expose the Trustee to personal liability, or
be unduly prejudicial to Holders not joining therein; and

                  (b)      subject to the  provisions  of  Section  315 of the 
Trust  Indenture Act, the Trustee may take any other action deemed proper by the
Trustee which is not inconsistent with such direction.

                  Section 5.13. Waiver of Past Defaults.

                  The Holders of not less than a majority in aggregate principal
amount of the Outstanding  Notes may on behalf of the Holders of all Outstanding
Notes waive any past Default hereunder and its consequences, except a Default

                  (a)      in the payment of the principal of, premium, if any, 
or interest on any Note; or

                  (b)      in respect of a covenant or a provision hereof which 
under this  Indenture  cannot be modified or amended  without the consent of the
Holder of each Note Outstanding affected by such modification or amendment. Upon
any such  waiver,  such Default  shall cease to exist,  and any Event of Default
arising  therefrom shall be deemed to have been cured, for every purpose of this
Indenture; but no such waiver shall extend to any subsequent or other Default or
impair any right consequent thereon.

                  Section 5.14. Undertaking for Costs.

                  All parties to this  Indenture  agree,  and each Holder of any
Note by his  acceptance  thereof shall be deemed to have agreed,  that any court
may in its discretion  require,  in any suit for the enforcement of any right or
remedy under this  Indenture,  or in any suit against the Trustee for any action
taken, suffered or omitted by it as Trustee, the filing by any party litigant in
such suit of an  undertaking  to pay the costs of such suit, and that such court
may in its discretion assess reasonable costs,  including reasonable  attorneys'
fees,  against any party litigant in such suit,  having due regard to the merits
and good faith of the claims or defenses  made by such party  litigant,  but the
provisions  of this  Section  shall  not  apply  to any suit  instituted  by the
Trustee,  to any suit instituted by any Holder, or group of Holders,  holding in
the aggregate more than 10% in principal amount of the Outstanding  Notes, or to
any suit  instituted  by any Holder for the  enforcement  of the  payment of the
principal  of,  premium,  if any,  or  interest  on,  any Note on or  after  the
respective  Stated  Maturities  expressed  in  such  Note  (or,  in the  case of
redemption, on or after the Redemption Date).

                  Section 5.15. Waiver of Stay, Extension or Usury Laws.

                  Each of the Company and the Guarantors,  if any, covenants (to
the extent that it may lawfully do so) that it will not at any time insist upon,
or plead, or in any manner whatsoever claim or take the benefit or advantage of,
any stay or extension law or any usury or other law wherever enacted,  now or at
any time hereafter in force,  which would prohibit or forgive the Company or any
Guarantor from paying all or any portion of the principal of,  premium,  if any,
or interest on the Notes contemplated herein or in the Notes or which may affect
the covenants or the performance of this Indenture;  and each of the Company and
the  Guarantors,  if any,  (to the  extent  that it may  lawfully  do so) hereby
expressly waives all benefit or advantage of any such law, and covenants that it
will not hinder,  delay or impede the  execution of any power herein  granted to
the  Trustee,  but will suffer and permit the  execution  of every such power as
though no such law had been enacted.

                                 Page 70 of 162
<PAGE>


                  Section 5.16. Remedies Subject to Applicable Law.

                  All rights, remedies and powers provided by this Article V may
be exercised  only to the extent that the exercise  thereof does not violate any
applicable  provision of law in the  premises,  and all the  provisions  of this
Indenture are intended to be subject to all applicable  mandatory  provisions of
law which may be  controlling  in the  premises  and to be limited to the extent
necessary so that they will not render this Indenture invalid,  unenforceable or
not entitled to be recorded,  registered  or filed under the  provisions  of any
applicable law.

                                   ARTICLE VI
                                   The Trustee

                  Section 6.01. Duties of Trustee.

                  Subject to the  provisions  of Trust  Indenture  Act  Sections
315(a) through 315(d):

                  (a)      if   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 its exercise
thereof as a prudent person would exercise or use under the circumstances in the
conduct of his own affairs;

                  (b)      except during the continuance of an Event of Default:

                           (1)      the Trustee need perform only those duties 
as are  specifically set forth in this Indenture and no covenants or Obligations
shall be implied in this Indenture that are adverse to the Trustee; and

                           (2)      in   the  absence of  bad  faith  or willful
misconduct 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 or the Escrow  Agreement.  However,  the Trustee
shall  examine the  certificates  and opinions to determine  whether or not they
conform to the requirements of this Indenture or the Escrow Agreement;

                  (c)      the Trustee may not be relieved from liability for 
its own negligent  action,  its own negligent failure to act, or its own willful
misconduct, except that:

                           (1)      this   Subsection  (c)  does  not  limit the
effect of Subsection (b) of this Section 6.01;

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

                           (3)      the   Trustee   shall  not  be  liable  with
respect to any  action it takes or omits to take in good  faith,  in  accordance
with a direction of the Holders of a majority in principal amount of Outstanding
Notes  relating to the time,  method and place of conducting  any proceeding for
any remedy available to the Trustee,  or exercising any trust or power confirmed
upon the Trustee under this Indenture;

                                 Page 71 of 162
<PAGE>


                  (d)      no   provision  of  this   Indenture  or  the  Escrow
Agreement shall require the Trustee to expend or risk its own funds or otherwise
incur any liability. The Trustee shall be under no obligation to exercise any of
its rights or powers, or to perform any duty under this Indenture at the request
of any Holders  unless such Holders  shall have offered to the Trustee  security
and  indemnity,  satisfactory  to the  Trustee,  against any loss,  liability or
expense;

                  (e)      whether   or  not  therein   expressly  so  provided,
every  provision  of this  Indenture  that in any way  relates to the Trustee is
subject to Subsections (a), (b), (c), (d) and (f) of this Section 6.01; and

                  (f)      the Trustee  shall not be liable for interest on any 
money or assets  received by it except as the Trustee may agree in writing  with
the  Company.  Assets held in trust by the Trustee need not be  segregated  from
other assets except to the extent required by law.

                  Section 6.02. Notice of Defaults.

                  Within 90 days  after a  Responsible  Officer  of the  Trustee
receives notice of the occurrence of any Default,  the Trustee shall transmit by
mail to all Holders and any other Persons  entitled to receive reports  pursuant
to Section  313(c) of the Trust  Indenture  Act,  as their  names and  addresses
appear in the Note  Register,  notice  of such  Default  hereunder  known to the
Trustee, unless such Default shall have been cured or waived; provided, however,
that,  except in the case of a  Default  in the  payment  of the  principal  of,
premium,  if any, or interest on any Note or a Default in complying  with any of
the  provisions  of the Escrow  Agreement,  the Trustee  shall be  protected  in
withholding  such  notice  if and so long as a trust  committee  of  Responsible
Officers of the Trustee in good faith  determines  that the  withholding of such
notice is in the interest of the Holders.

                  Section 6.03. Certain Rights of Trustee.

                  Subject to the  provisions  of Section  6.01  hereof and Trust
Indenture Act Sections 315(a) through 315(d):

                  (a)      the Trustee may rely and shall be protected in acting
or  refraining  from acting upon receipt by it of 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,  and the Trustee need not  investigate  any fact or
matter stated therein;

                  (b)      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;

                  (c)      before the  Trustee  acts  or refrains  from  acting,
it may require an Officer's  Certificate  or an Opinion of Counsel or both.  The
Trustee  shall  not be liable  for any  action it takes or omits to take in good
faith reliance on such Officer's  Certificate or Opinion of Counsel. The Trustee
may consult with counsel of its  selection and any advice of such counsel or any
Opinion of Counsel shall be full and complete  authorization  and  protection in
respect of any action  taken,  suffered or omitted by it hereunder in good faith
and in reliance thereon in accordance with such advice or Opinion of Counsel;

                  (d)      the Trustee  shall be under no obligation to exercise
any of the  rights  or  powers  vested  in it by this  Indenture  or the  Escrow
Agreement  at the request or  direction  of any of the Holders  



                                 Page 72 of 162
<PAGE>

pursuant  to this  Indenture,  unless  such  Holders  shall have  offered to the
Trustee  security or indemnity  satisfactory  to the Trustee  against the costs,
expenses and liabilities which might be incurred thereby;

                  (e)      the  Trustee shall not be liable for any action taken
or omitted by it in good faith and believed by it to be authorized or within the
discretion,  rights or powers conferred upon it by this Indenture other than any
liabilities  arising out of the negligence,  bad faith or willful  misconduct of
the Trustee;

                  (f)      the   Trustee  shal   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, approval,  appraisal,  bond, debenture,  note, coupon,  security or other
paper or  document  unless  requested  in writing to do so by the Holders of not
less  than  a  majority  in  aggregate   principal  amount  of  the  Notes  then
Outstanding;  provided  that,  if the payment  within a  reasonable  time to the
Trustee of the costs, expenses or liabilities likely to be incurred by it in the
making of such  investigation is, in the opinion of the Trustee,  not reasonably
assured  to the  Trustee  by the  security  afforded  to it by the terms of this
Indenture, the Trustee may require reasonable indemnity against such expenses or
liabilities as a condition to proceeding;  the reasonable expenses of every such
investigation  so  requested  by the  Holders of not less than 25% in  aggregate
principal  amount of the Notes  Outstanding  shall be paid by the Company or, if
paid by the Trustee or any predecessor  Trustee,  shall be repaid by the Company
upon demand;  provided,  further,  the Trustee in its  discretion  may make such
further inquiry or investigation  into such facts or matters as it may deem 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;  provided, further, that no
permissive  power,  right or  remedy  conferred  upon  the  Trustee  under  this
Indenture  shall be construed to impose a duty to exercise such power,  right or
remedy; and

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

                  Section   6.04.   Trustee  Not   Responsible   for   Recitals,
Dispositions of Notes or Application of Proceeds Thereof.

                  The  recitals  contained  herein and in the Notes,  except 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 shall not be responsible for and makes no  representations as to the
validity or sufficiency of this Indenture, the Escrow Agreement or of the Notes,
and it shall not be  responsible  for any statement or recital in this Indenture
or any statement in the Notes or any other document  executed in connection with
the sale of the Notes or  pursuant  to this  Indenture,  except that the Trustee
represents  that it is duly authorized to execute and deliver this Indenture and
the  Escrow  Agreement,  authenticate  the Notes  and  perform  its  obligations
hereunder and that the statements made by it in any Statement of Eligibility and
Qualification  on Form T-1 supplied to the Company are true and accurate subject
to the  qualifications  set forth therein.  The Trustee shall not be accountable
for the use or application by the Company of Notes or the proceeds thereof.

                  Section 6.05. Trustee and Agents May Hold Notes;  Collections;
etc.

                  The Trustee,  any Paying  Agent,  Note  Registrar or any other
agent of the Company,  in its individual or any other  capacity,  may become the
owner or pledgee of Notes, with the same rights it would have if it were not the
Trustee,  Paying Agent, Note Registrar or such other agent and, subject to 



                                 Page 73 of 162
<PAGE>

Trust  Indenture Act Sections 310 and 311, may  otherwise  deal with the Company
and receive, collect, hold and retain collections from the Company with the same
rights it would have if it were not the Trustee, Paying Agent, Note Registrar or
such other agent.  Any Paying  Agent,  other than the Trustee,  holding funds or
securities  in trust for the benefit of the Holders or the Trustee shall give to
the Trustee notice of any default by any obligor upon the Notes in the making of
any such  payment.  The Escrow  Agent  shall have the same rights as the Trustee
under this Section 6.05.

                  Section 6.06. Money Held in Trust.

                  All  moneys  received  by the  Trustee  shall,  until  used or
applied as herein  provided,  be held in trust for the  purposes  for which they
were received,  but need not be segregated from other funds except to the extent
required  by  mandatory  provisions  of law.  Except  for  funds  or  securities
deposited with the Trustee pursuant to Article IV, the Trustee shall be required
to invest all moneys  received by the  Trustee,  until used or applied as herein
provided,  in Cash Equivalents in accordance with the directions of the Company;
provided, however, that nothing herein shall be deemed to require the Trustee or
any other Person  acting as Paying Agent to invest or pay interest on funds held
for the payment of any Notes after the Maturity  thereof.  The Trustee shall not
be liable for any gain or loss on funds or securities deposited with the Trustee
and invested or maintained by the Trustee in accordance  with the  directions of
the Company.

                  Section 6.07.  Compensation and Indemnification of Trustee and
Its Prior Claim.

                  The Company  covenants  and agrees to pay to the Trustee  from
time to time,  and the Trustee  shall be entitled to, such  compensation  as the
parties shall agree in writing from time to time 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) and the  Company
covenants  and  agrees to pay or  reimburse  the  Trustee  and each  predecessor
Trustee upon its request for all reasonable expenses, disbursements and advances
incurred  or made by or on behalf of the Trustee in  accordance  with any of the
provisions of this  Indenture  (including the  reasonable  compensation  and the
expenses and  disbursements  of its counsel and of all agents and other  persons
not regularly in its employ) except any such expense, disbursement or advance as
may arise from its negligence, bad faith or willful misconduct.

                  The Company also covenants and agrees to indemnify the Trustee
and each predecessor Trustee, and their respective officers,  directors,  agents
and employees, for, and to hold it harmless against, any claim, loss, liability,
tax, assessment or other governmental charge (other than taxes applicable to the
Trustee's  compensation  hereunder) or expense incurred without negligence,  bad
faith or willful  misconduct on its part,  arising out of or in connection  with
the acceptance or  administration  of this Indenture or the trusts hereunder and
its duties  hereunder,  including  enforcement  of this Section  6.07,  and also
including  any  liability  which the Trustee may incur as a result of failure to
withhold,  pay or report any tax,  assessment or other governmental  charge, and
the costs and expenses of defending itself against or investigating any claim or
liability in connection with the exercise or performance of any of its powers or
duties hereunder.

                  The  obligations  of the Company  under this  Section  6.07 to
compensate and indemnify the Trustee and each predecessor  Trustee and to pay or
reimburse  the Trustee and each  predecessor  Trustee for  reasonable  expenses,
disbursements and advances shall constitute an additional  obligation  hereunder
and shall  survive the  satisfaction  and  discharge of this  Indenture  and the
resignation or removal of the Trustee and each predecessor  Trustee. As security
for the  performance of the  obligations of the Company under this Section 6.07,
the  Trustee  shall have a lien prior to the Notes upon all  property  and funds
held or  collected  by the Trustee as such,  except  funds held in trust for the
benefit of the Holders of particular Notes.

                                 Page 74 of 162
<PAGE>


                  When the Trustee incurs expenses or renders  services after an
Event of Default  specified  in Section  5.01(i)  occurs,  the  expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute administrative expenses under any Bankruptcy
Law without any need to demonstrate  substantial  contribution  under Bankruptcy
Law.

                  Section 6.08. Conflicting Interests.

                  The Trustee shall comply with the provisions of Section 310(b)
of the Trust Indenture Act.

                  Section 6.09. Trustee Eligibility.

                  There shall at all times be a Trustee hereunder which shall be
eligible to act as trustee under Trust  Indenture  Act Section  310(a) and which
shall have a combined  capital  and  surplus  of at least  $100,000,000,  to the
extent there is an  institution  eligible  and willing to serve.  If the Trustee
does not have a Corporate  Trust Office in The City of New York, the Trustee may
appoint an agent in The City of New York reasonably acceptable to the Company to
conduct any activities which the Trustee may be required under this Indenture to
conduct in The City of New York. If such Trustee  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  6.09,  the  combined  capital and surplus of such
corporation  shall be deemed to be its combined capital and surplus as set forth
in its most recent report of condition so published.  If at any time the Trustee
shall cease to be eligible in  accordance  with the  provisions  of this Section
6.09,  the Trustee  shall resign  immediately  in the manner and with the effect
hereinafter specified in this Article.

                  Section  6.10.   Resignation   and  Removal;   Appointment  of
Successor Trustee.

                  (a)      No  resignation or  removal of  the  Trustee  and  no
appointment  of a  successor  trustee  pursuant  to this  Article  shall  become
effective  until the acceptance of  appointment  by the successor  trustee under
Section 6.11.

                  (b)      The  Trustee, or  any trustee or  trustees  hereafter
appointed,  may at any time  resign  by giving  written  notice  thereof  to the
Company.  Upon receiving such notice or resignation,  the Company shall promptly
appoint a successor trustee by written  instrument  executed by authority of the
Board of  Directors  of the  Company,  a copy of which shall be delivered to the
resigning  Trustee and a copy to the  successor  trustee.  If an  instrument  of
acceptance by a successor  trustee shall not have been  delivered to the Trustee
within 30 days after the giving of such  notice of  resignation,  the  resigning
Trustee  may,  or any  Holder  who has been a bona fide  Holder of a Note 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.  Such court may  thereupon,  after such notice,  if any, as it may deem
proper, appoint and prescribe a successor trustee.

                  (c)      The  Trustee may be removed at any time for any cause
or for  no  cause  by an Act of the  Holders  of not  less  than a  majority  in
aggregate  principal amount of the Outstanding  Notes,  delivered to the Trustee
and to the Company.

                  (d)      If at any time:

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

                                 Page 75 of 162
<PAGE>


                           (2)      the Trustee shall cease to be eligible under
Section  6.09 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 Note 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 case, (i) the Company
by a Board  Resolution may remove the Trustee,  or (ii) subject to Section 5.14,
the  Holder of any Note who has been a bona  fide  Holder of a Note 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. Such court may thereupon, after such notice,
if any,  as it may deem proper and  prescribe,  remove the Trustee and appoint 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 and shall comply with the applicable  requirements of Section
6.11. If, within 60 days after such resignation, removal or incapability, or the
occurrence of such vacancy, the Company has not appointed a successor Trustee, a
successor  trustee shall be appointed by the Act of the Holders of a majority in
principal  amount of the  Outstanding  Notes  delivered  to the  Company and the
retiring  Trustee.  Such 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  of the Notes and  accepted
appointment in the manner hereinafter provided, the Trustee or the Holder of any
Note who has been a bona fide  Holder  for at least six months  may,  subject to
Section 5.14, on behalf of himself and all others similarly  situated,  petition
any court of competent jurisdiction for the appointment of a successor trustee.

                  The  Company  shall give notice of each  resignation  and each
removal of the Trustee and each  appointment  of a successor  trustee by mailing
written  notice of such  event by  first-class  mail,  postage  prepaid,  to the
Holders of Notes as their names and addresses appear in the Note Register.  Each
notice shall  include the name of the  successor  trustee and the address of its
Corporate Trust Office or agent hereunder.

                  Section 6.11. 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 as if  originally  named as
Trustee hereunder;  but, nevertheless,  on the written request of the Company or
the successor trustee, upon payment of its charges pursuant to Section 6.07 then
unpaid, such retiring Trustee shall pay over to the successor trustee all moneys
at the time held by it  hereunder  and shall  execute and deliver an  instrument
transferring  to such  successor  trustee all such  rights,  powers,  duties and
obligations.  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 and powers.

                  No  successor  trustee  with respect to the Notes shall accept
appointment  as  provided  in  this  Section  6.11  unless  at the  time of such
acceptance such successor  trustee shall be eligible to act as trustee under the
provisions of Trust  Indenture Act Section  310(a) and this Article VI and shall
have a 



                                 Page 76 of 162
<PAGE>

combined capital and surplus of at least  $10,000,000 and have a Corporate Trust
Office or an agent selected in accordance with Section 6.09.

                  Upon  acceptance of  appointment  by any successor  trustee as
provided in this  Section  6.11,  the Company  shall give notice  thereof to the
Holders of the Notes,  by mailing such notice to such Holders at their addresses
as they shall appear on the Note  Register.  If the acceptance of appointment is
substantially  contemporaneous with the appointment,  then the notice called for
by the preceding  sentence may be combined with the notice called for by Section
6.10. If the Company  fails to give such notice within 10 days after  acceptance
of appointment by the successor trustee,  the successor trustee shall cause such
notice to be given at the expense of the Company.

                  Section 6.12. Merger, Conversion,  Consolidation or Succession
to Business.

                  Any  corporation  into  which  the  Trustee  may be  merged or
converted or with which it may be  consolidated,  or any  corporation  resulting
from any merger,  conversion  or  consolidation  to which the Trustee shall be a
party,  or  any  corporation  succeeding  to  all  or  substantially  all of the
corporate  trust  business of the Trustee  (including  the trust created by this
Indenture) shall be the successor of the Trustee  hereunder,  provided that such
corporation  shall be eligible under Trust Indenture Act Section 310(a) and this
Article  VI  and  shall  have  a  combined  capital  and  surplus  of  at  least
$100,000,000  and  have  a  Corporate  Trust  Office  or an  agent  selected  in
accordance  with Section  6.09,  without the execution or filing of any paper or
any further act on the part of any of the parties hereto.

                  In  case at the  time  such  successor  to the  Trustee  shall
succeed to the trusts created by this Indenture any of the Notes shall have been
authenticated but not delivered, any such successor to the Trustee may adopt the
certificate of authentication of any predecessor  Trustee and deliver such Notes
so authenticated; and, in case at that time any of the Notes shall not have been
authenticated,  any successor to the Trustee may authenticate  such Notes either
in the  name  of any  predecessor  hereunder  or in the  name  of the  successor
trustee;  and in all such cases such certificate shall have the full force which
it is anywhere in the Notes or in this Indenture  provided that the  certificate
of the Trustee shall have;  provided that the right to adopt the  certificate of
authentication of any predecessor  Trustee or to authenticate  Notes in the name
of any  predecessor  Trustee  shall apply only to its successor or successors by
merger, conversion or consolidation.

                  Section  6.13.   Preferential  Collection  of  Claims  Against
Company.

                  If and when the  Trustee  shall be or become a creditor of the
Company (or other obligor under the Notes),  the Trustee shall be subject to the
provisions of the Trust Indenture Act regarding the collection of claims against
the Company  (or any such other  obligor).  A Trustee  who has  resigned or been
removed  shall be subject to Trust  Indenture  Act Section  311(a) to the extent
indicated therein.

                                   ARTICLE VII
                Holders' Lists and Reports by Trustee and Company

                  Section 7.01.  Company to Furnish  Trustee Names and Addresses
of Holders. The Company will furnish or cause to be furnished to the Trustee.

                  (a)      semiannually,  not  more  than  15  days  after  each
Regular Record Date, a list, in such form as the Trustee may reasonably require,
of the names and addresses of the Holders as of such Regular Record Date; and

                                 Page 77 of 162
<PAGE>


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

provided,  however,  that  if and so  long  as the  Trustee  shall  be the  Note
Registrar, no such list need be furnished.

                  Section 7.02. Disclosure of Names and Addresses of Holders.

                  Holders  may  communicate  pursuant  to  Trust  Indenture  Act
Section  312(b)  with other  Holders  with  respect to their  rights  under this
Indenture or the Notes,  and the Trustee  shall comply with Trust  Indenture Act
Section  312(b).  The Company,  the Trustee,  the Note  Registrar  and any other
Person shall have the protection of Trust Indenture Act Section 312(c). Further,
every  Holder of Notes,  by  receiving  and  holding  the same,  agrees with the
Company and the Trustee that neither the Company nor the Trustee or any agent of
either of them  shall be held  accountable  by reason of the  disclosure  of any
information  as to the names and  addresses  of the Holders in  accordance  with
Trust  Indenture  Act  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 Trust Indenture
Act Section 312.

                  Section 7.03. Reports by Trustee.

                  (a)      Within 60 days after  May 15 of each  year commencing
with the first May 15 after the issuance of Notes,  the Trustee,  if so required
under the Trust  Indenture Act,  shall  transmit by mail to all Holders,  in the
manner and to the extent provided in Trust Indenture Act Section 313(c), a brief
report  dated as of such May 15 in  accordance  with  and  with  respect  to the
matters  required by Trust Indenture Act Section 313(a).  The Trustee shall also
transmit  by mail to all  Holders,  in the manner and to the extent  provided in
Trust Indenture Act Section  313(c),  a brief report in accordance with and with
respect to the matters required by Trust Indenture Act Section 313(b)(2).

                  (b)      A copy of each report transmitted to Holders pursuant
to this Section 7.03 shall, at the time of such  transmission,  be mailed to the
Company  and filed with each stock  exchange,  if any,  upon which the Notes are
listed  and also with the  Commission.  The  Company  will  notify  the  Trustee
promptly if the Notes are listed on any stock exchange.

                  Section 7.04. Reports by Company.

                  The Company and any Guarantor, as the case may be, shall:

                  (a)      file  with  the Trustee,  within 15  days  after  the
Company or any Guarantor,  as the case may be, is required to file the same with
the Commission,  copies of the annual reports and of the information,  documents
and other  reports (or copies of such  portions of any of the  foregoing  as the
Commission may from time to time by rules and regulations  prescribe)  which the
Company or any Guarantor may be required to file with the Commission pursuant to
Section 13 or  Section  15(d) of the  Exchange  Act;  or, if the  Company or any
Guarantor, as the case may be, is not required to file information, documents or
reports  pursuant to either of said  Sections,  then it shall (i) deliver to the
Trustee annual audited financial statements of the Company and its Subsidiaries,
prepared on a Consolidated  basis in conformity with GAAP, within 120 days after
the end of each fiscal year of the Company,  and (ii) file with the Trustee and,
to the extent permitted by law, the Commission, in accordance with the rules and
regulations  prescribed  from  time  to  time  by the  Commission,  such  of the
supplementary  and  periodic  information,  documents  and reports  which may be
required  pursuant  to 



                                 Page 78 of 162
<PAGE>

Section 13 of the Exchange Act in respect of a security listed and registered on
a national  securities  exchange as may be prescribed  from time to time in such
rules and regulations;

                  (b)      file   with  the  Trustee  and  the  Commission,   in
accordance  with the rules and  regulations  prescribed from time to time by the
Commission,  such additional information,  documents and reports with respect to
compliance  by the  Company  or any  Guarantor,  as the  case  may be,  with the
conditions  and covenants of this Indenture as are required from time to time by
such rules and regulations  (including such  information,  documents and reports
referred to in Trust Indenture Act Section 314(a)); and

                  (c)      within 15  days  after  the filing  thereof  with the
Trustee,  transmit  by mail  to all  Holders  in the  manner  and to the  extent
provided  in  Trust  Indenture  Act  Section  313(c),   such  summaries  of  any
information,  documents  and reports  required to be filed by the Company or any
Guarantor,  as the  case  may  be,  pursuant  to  Section  10.20  hereunder  and
subsections (a) and (b) of this Section as are required by rules and regulations
prescribed from time to time by the Commission.

                                   ARTICLE VIII
                      Consolidation, Merger, Sale of Assets

                  Section 8.01.  Company and Guarantors May  Consolidate,  etc.,
Only on Certain Terms.

                  (a)      The  Company  will  not, in  a  single transaction or
through a series of related transactions, consolidate with or merge with or into
any other Person or sell, assign, convey,  transfer,  lease or otherwise dispose
of all or substantially  all of its properties and assets to any Person or group
of affiliated  Persons, or permit any of its Subsidiaries to enter into any such
transaction or series of related  transactions if such  transaction or series of
related  transactions,  in the  aggregate,  would result in a sale,  assignment,
conveyance,  transfer,  lease or disposition of all or substantially  all of the
properties  and assets of the Company  and its  Subsidiaries  on a  Consolidated
basis to any other Person or group of affiliated Persons, unless at the time and
after giving effect thereto:

                           (i)      either  (a)  the   Company   will   be   the
continuing  corporation in the case of a consolidation  or merger  involving the
Company  or  (b)  the  Person  (if  other  than  the  Company)  formed  by  such
consolidation  or into which the Company is merged or the Person which  acquires
by  sale,  assignment,   conveyance,  transfer,  lease  or  disposition  all  or
substantially  all  of  the  properties  and  assets  of  the  Company  and  its
Subsidiaries  on  a  Consolidated  basis  (the  "Surviving  Entity")  will  be a
corporation  duly  organized and validly  existing  under the laws of the United
States of America, any state thereof or the District of Columbia and such Person
expressly  assumes,   by  a  supplemental   indenture,   in  a  form  reasonably
satisfactory to the Trustee, all the obligations of the Company under the Notes,
this Indenture,  the Escrow Agreement and the Registration Rights Agreement,  as
the case may be, and the Notes,  this  Indenture,  the Escrow  Agreement and the
Registration  Rights  Agreement  will  remain  in full  force  and  effect as so
supplemented;

                           (ii)     immediately after  giving   effect  to  such
transaction on a pro forma basis (and treating any  Indebtedness  not previously
an  obligation  of the  Company or any of its  Subsidiaries  which  becomes  the
obligation  of the  Company  or any of its  Subsidiaries  as a  result  of  such
transaction as having been incurred at the time of such transaction), no Default
or Event of Default will have occurred and be continuing;


                                 Page 79 of 162
<PAGE>


                           (iii)    immediately   after  giving  effect to  such
transaction  on a pro forma basis,  the Company (or the Surviving  Entity if the
Company is not the continuing obligor hereunder) could incur $1.00 of additional
Indebtedness (other than Permitted Indebtedness) under Section 10.08(a);

                           (iv)     at   the  time   of   the transaction,  each
Guarantor,  if any, unless it is the other party to the  transactions  described
above,  will have by supplemental  indenture  confirmed that its Guarantee shall
apply to such Person's obligations under this Indenture and under the Notes;

                           (v)      at the time of  the  transaction the Company
or the Surviving Entity will have delivered,  or caused to be delivered,  to the
Trustee,  in form and  substance  reasonably  satisfactory  to the  Trustee,  an
Officers'  Certificate  and an Opinion of Counsel,  each to the effect that such
consolidation,  merger, sale, assignment,  conveyance,  transfer, lease or other
transaction and the  supplemental  indenture in respect thereof comply with this
Indenture.

                  (b)      Notwithstanding   the  foregoing,  the  provisions of
Section  8.01(a)  shall not apply to (i) a merger or  consolidation  between  or
among the Company and any one or more of its Wholly-Owned Subsidiaries, and (ii)
a merger or  consolidation  of the  Company  into any  Person  in a  transaction
designed  solely for the purpose of  effecting a change in the  jurisdiction  of
incorporation of the Company within the United States of America.

                  Section 8.02. Successor Substituted.

                  In the event of any transaction (other than a lease) described
in and complying with the conditions listed in Section 8.01 in which the Company
is not the  Surviving  Person,  such  Surviving  Person shall succeed to, and be
substituted  for, and may exercise every right and power of, the Company and the
Company  shall be  discharged  from all  obligations  and  covenants  under this
Indenture,   the  Notes,  the  Escrow  Agreement  and  the  Registration  Rights
Agreement.

                                   ARTICLE IX
                             Supplemental Indentures

                  Section 9.01.  Supplemental  Indentures and Agreements without
Consent of Holders.

                  Without  the  consent  of  any  Holders,   the  Company,   the
Guarantors,  if any, and any other obligor under the Notes when  authorized by a
Board Resolution,  and the Trustee, at any time and from time to time, may enter
into  one  or  more  indentures  supplemental  hereto  or  agreements  or  other
instruments with respect to any Guarantee, in form and substance satisfactory to
the Trustee, for any of the following purposes:

                  (a)      to  evidence the  succession  of  another  Person  to
the Company or a  Guarantor  and the  assumption  by any such  successor  of the
covenants  of the  Company  or  such  Guarantor  herein  and in the  Notes,  the
Registration  Rights  Agreement,  the Escrow  Agreement  and in any Guarantee in
accordance with Article VIII;

                  (b)      to add to the covenants of the Company, any Guarantor
or any other  obligor  upon the  Notes for the  benefit  of the  Holders,  or to
surrender any right or power  conferred upon the Company or any Guarantor or any
other  obligor upon the Notes,  as  applicable,  herein,  in the Notes or in any
Guarantee;

                                 Page 80 of 162
<PAGE>



                  (c)      to cure any  ambiguity,  or to correct or  supplement
any  provision  herein  or in  any  supplemental  indenture,  the  Notes  or any
Guarantee which may be defective or inconsistent with any other provision herein
or any  supplemental  indenture or in the Notes or any  Guarantee or to make any
other  provisions  with  respect  to  matters or  questions  arising  under this
Indenture,  any  supplemental  indenture,  the Notes or any Guarantee;  provided
that, in each case, such provisions  shall not adversely  affect the interest of
the Holders;

                  (d)      to  comply with the requirements of the Commission in
order to effect or maintain the  qualification of this Indenture under the Trust
Indenture Act, as contemplated by Section 9.05 or otherwise;

                  (e)      to add  a  Guarantor pursuant to  the requirements of
Section 10.13;

                  (f)      to   evidence  and  provide  the  acceptance  of  the
appointment of a successor trustee hereunder; or

                  (g)      to   mortgage,   pledge,   hypothecate   or   grant a
security  interest  in favor of the  Trustee  for the  benefit of the Holders as
additional  security  for the payment and  performance  of the  Company's or any
Guarantor's Indenture Obligations,  in any property, or assets, including any of
which are  required  to be  mortgaged,  pledged or  hypothecated,  or in which a
security  interest is  required  to be granted to the  Trustee  pursuant to this
Indenture or otherwise.

                  Section 9.02.  Supplemental  Indentures  and  Agreements  with
Consent of Holders.

                  Except as permitted by Section  9.01,  with the consent of the
Holders of at least a majority in aggregate  principal amount of the Outstanding
Notes, by Act of said Holders delivered to the Company, each Guarantor,  if any,
and the  Trustee,  the  Company and each  Guarantor  (if a party  thereto)  when
authorized by Board Resolutions, and the Trustee may (i) enter into an indenture
or  indentures  supplemental  hereto or  agreements  or other  instruments  with
respect to any Guarantee in form and substance  satisfactory to the Trustee, for
the purpose of adding any  provisions  to or amending,  modifying or changing in
any manner or eliminating any of the provisions of this Indenture,  the Notes or
any Guarantee (including but not limited to, for the purpose of modifying in any
manner  the  rights  of the  Holders  under  this  Indenture,  the  Notes or any
Guarantee) or (ii) waive  compliance with any provision in this  Indenture,  the
Notes or any Guarantee  (other than waivers of past Defaults  covered by Section
5.13 and waivers of  covenants  which are covered by Section  10.21);  provided,
however,  that no such  supplemental  indenture,  agreement or instrument shall,
without the consent of the Holder of each Outstanding Note affected thereby:

                  (a)      change the Stated  Maturity  of the  principal of, or
any installment of interest on, or change to an earlier date any redemption date
of, or waive a default in the payment of the  principal or interest on, any such
Note or reduce the principal  amount thereof or the rate of interest  thereon or
any premium payable upon the redemption  thereof, or change the coin or currency
in which the  principal  of any Note or any premium or the  interest  thereon is
payable,  or impair the right to institute suit for the  enforcement of any such
payment on or after the Stated Maturity  thereof (or, in the case of redemption,
on or after the Redemption Date);

                  (b)      amend, change or modify the obligation of the Company
to make and consummate an Offer with respect to any Asset Sale or Asset Sales in
accordance  with  Section  10.12 or the  obligation  of the  Company to make and
consummate  a Change of  Control  Offer in the event of a Change of  Control  in
accordance with Section 10.14,  including,  in each case, amending,  changing or
modifying any definitions relating thereto

                                 Page 81 of 162
<PAGE>



                  (c)      reduce  the   percentage   in  principal   amount  of
the  Outstanding  Notes,  the consent of whose  Holders is required for any such
supplemental  indenture,  or the consent of whose  Holders is  required  for any
waiver or compliance with certain provisions of this Indenture;

                  (d)      modify any of the  provisions  of this  Section  9.02
or Section 5.13 or 10.21,  except to increase the percentage of such Outstanding
Notes required for any such actions or to provide that certain other  provisions
of this Indenture cannot be modified or waived without the consent of the Holder
of each such Note affected thereby;

                  (e)      except as   otherwise  permitted  under Article VIII,
consent to the  assignment or transfer by the Company or any Guarantor of any of
its rights and obligations hereunder;

                  (f)      amend   or   modify  any  of  the  provisions of this
Indenture in any manner which  subordinates  the Notes issued hereunder in right
of payment to any other  Indebtedness of the Company or which  subordinates  any
Guarantee in right of payment to any other Indebtedness of the Guarantor issuing
such Guarantee; or

                  (g)      modify the  provisions  of the  Escrow  Agreement  or
this  Indenture  relating to the Collateral in any manner adverse to the Holders
or release any of the Collateral from the Lien under the Escrow Agreement (other
than in accordance with its terms) or permit any other  obligation to be secured
by the Collateral.

                  Upon the written request of the Company and each Guarantor, if
any, accompanied by a copy of Board Resolutions authorizing the execution of any
such supplemental  indenture or Guarantee,  and upon the filing with the Trustee
of evidence of the consent of Holders as aforesaid,  the Trustee shall join with
the Company and each Guarantor in the execution of such  supplemental  indenture
or Guarantee.

                  It shall not be  necessary  for any Act of Holders  under this
Section  9.02  to  approve  the  particular  form of any  proposed  supplemental
indenture or Guarantee or agreement or instrument relating to any Guarantee, but
it shall be sufficient if such Act shall approve the substance thereof.

                  Section 9.03.   Execution  of   Supplemental   Indentures  and
Agreements.

                  In executing,  or accepting the additional  trusts created by,
any supplemental  indenture,  agreement,  instrument or waiver permitted by this
Article IX or the modifications thereby of the trusts created by this Indenture,
the Trustee  shall be entitled to receive,  and (subject to Trust  Indenture Act
Sections 315(a) through 315(d) and Section 6.03 hereof) shall be fully protected
in relying upon, an Opinion of Counsel and an Officers' Certificate stating that
the  execution  of such  supplemental  indenture,  agreement  or  instrument  is
authorized  or  permitted by this  Indenture.  The Trustee may, but shall not be
obligated  to,  enter  into  any  such  supplemental  indenture,   agreement  or
instrument  which affects the Trustee's own rights,  duties or immunities  under
this Indenture, any Guarantee or otherwise.

                  Section 9.04. Effect of Supplemental Indentures.

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

                                 Page 82 of 162
<PAGE>



                  Section 9.05. Conformity with Trust Indenture Act.

                  Every supplemental indenture executed pursuant to this Article
IX shall  conform  to the  requirements  of the Trust  Indenture  Act as then in
effect.

                  Section 9.06. Reference in Notes to Supplemental Indentures.

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

                  Section 9.07. Notice of Supplemental Indentures.

                  Promptly after the execution by the Company, any Guarantor and
the Trustee of any supplemental  indenture pursuant to the provisions of Section
9.02, the Company shall give notice  thereof to the Holders of each  Outstanding
Note  affected,  in the manner  provided for in Section  1.06,  setting forth in
general terms the substance of such supplemental  indenture.  Any failure of the
Company to mail such notice, or any defect therein,  shall not, however,  in any
way impair or affect the validity of any such supplemental indenture.

                                   ARTICLE X
                                   Covenants

                  Section 10.01. Payment of Principal, Premium and Interest.

                  The Company  shall duly and  punctually  pay the principal of,
premium,  if any, and interest on the Notes in accordance  with the terms of the
Notes and this Indenture.

                  Section 10.02. Maintenance of Office or Agency.

                  The Company shall maintain an office or agency where Notes may
be  presented or  surrendered  for  payment.  The Company also will  maintain an
office or agency  (which  shall be located in the Borough of  Manhattan,  in the
City of New  York,  State  of New  York)  where  Notes  may be  surrendered  for
registration  of transfer,  redemption or exchange and an office or agency where
notices  and  demands  to or upon the  Company  in respect of the Notes and this
Indenture may be served.  The Company hereby initially  designates the office of
Wilmington Trust Company,  c/o Harris Trust Company of New York, 88 Pine Street,
19th Floor,  Wall Street Plaza, New York, New York 10005 as its office or agency
in the Borough of  Manhattan,  City of New York.  The  Company  will give prompt
written  notice to the Trustee of the location and any change in the location of
any such offices or agencies.  If at any time the Company shall fail to maintain
any such required  offices or agencies or shall fail to furnish the Trustee with
the address thereof, such presentations,  surrenders, notices and demands may be
made or served at the office of the Trustee and the Company hereby  appoints the
Trustee such agent as its agent to receive all such  presentations,  surrenders,
notices and demands.

                  The Company may from time to time  designate one or more other
offices or agencies  (in or outside of The City of New York) where the Notes may
be presented or surrendered  for any or all such purposes,  and may from time to
time rescind such  designation.  The Company will give prompt  written 



                                 Page 83 of 162
<PAGE>

notice to the Trustee of any such  designation  or rescission  and any change in
the location of any such office or agency.

                  The Trustee shall initially act as Paying Agent for the Notes.

                  Section 10.03. Money for Note Payments to Be Held in Trust.

                  If the Company or any of its Affiliates  shall at any time act
as Paying  Agent,  it will,  on or  before  each due date of the  principal  of,
premium,  if any, or interest on any of the Notes,  segregate  and hold in trust
for the  benefit of the Holders  entitled  thereto a sum  sufficient  to pay the
principal, 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 will
promptly notify the Trustee of its action or failure so to act.

                  If the  Company  or any of its  Affiliates  is not  acting  as
Paying Agent,  the Company will, on or before each due date of the principal of,
premium, if any, or interest on any of the Notes,  deposit with a Paying Agent a
sum in same day funds  sufficient  to pay the  principal,  premium,  if any,  or
interest  so becoming  due,  such sum to be held in trust for the benefit of the
Persons entitled to such principal, 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.

                  If the Company is not acting as Paying Agent, the Company will
cause each  Paying  Agent  other than the  Trustee to execute and deliver to the
Trustee an  instrument  in which such Paying Agent shall agree with the Trustee,
subject to the provisions of this Section, that such Paying Agent will:

                  (a)      hold  all  sums  held  by  it  for the payment of the
principal of, premium, if any, or interest on the Notes 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;

                  (b)      give   the  Trustee  notice  of  any  Default  by the
Company or any  Guarantor (or any other obligor upon the Notes) in the making of
any payment of principal, premium, if any, or interest on the Notes;

                  (c)      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

                  (d)      acknowledge,  accept  and   agree  to comply in  all 
aspects with the provisions of this Indenture relating to the duties, rights and
disabilities of such Paying Agent.

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

                  Any money  deposited with the Trustee or any Paying Agent,  or
then held by the Company, in trust for the payment of the principal of, premium,
if any, or interest on any Note and remaining unclaimed for two years after such
principal  and  premium,  if any, or interest  has become due and payable  shall
promptly be paid to the Company on Company  Request,  net of any amounts due the
Trustee  or such  Paying  Agent,  as the  case may be,  or (if then  held by the
Company) shall be discharged from such trust;  and the Holder of such Note shall
thereafter,  as an  unsecured  general  creditor,  look only 



                                 Page 84 of 162
<PAGE>

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 the New York Times and
The Wall Street Journal (national edition), and mail to each such Holder, 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  notification,
publication and mailing, any unclaimed balance of such money then remaining will
promptly be repaid to the Company.

                  Section 10.04. Corporate Existence.

                  Subject to Article  VIII,  the Company shall do or cause to be
done all  things  necessary  to  preserve  and keep in full force and effect the
corporate existence and related rights and franchises (charter and statutory) of
the Company and each Subsidiary;  provided,  however, that the Company shall not
be required to preserve any such right or franchise or the  corporate  existence
of any such  Subsidiary if the Board of Directors of the Company shall determine
that the preservation thereof is no longer necessary or desirable in the conduct
of the business of the Company and its  Subsidiaries  as a whole;  and provided,
further,  however,  that the  foregoing  shall not prohibit a sale,  transfer or
conveyance of a Subsidiary or any of the assets of the Company or any Subsidiary
not in violation of the terms of this Indenture.

                  Section 10.05. Payment of Taxes and Other Claims.

                  The  Company  shall  pay or  discharge  or cause to be paid or
discharged, on or before the date the same shall become due and payable, (a) all
taxes,  assessments and governmental  charges levied or imposed upon the Company
or any of its  Subsidiaries  shown to be due on any return of the Company or any
of its  Subsidiaries  or  otherwise  assessed  or upon the  income,  profits  or
property  of  the  Company  or  any of its  Subsidiaries  if  failure  to pay or
discharge  the same could  reasonably  be  expected  to have a material  adverse
effect on the ability of the Company or any Guarantor to perform its obligations
hereunder and (b) all lawful claims for labor, materials and supplies, which, if
unpaid,  would by law become a Lien upon the  property  of the Company or any of
its  Subsidiaries,  except for any Lien  permitted to be incurred  under Section
10.11,  if failure to pay or discharge the same could  reasonably be expected to
have a material adverse effect on the ability of the Company or any Guarantor to
perform its obligations hereunder; provided, however, that the Company shall not
be required to pay or discharge or cause to be paid or discharged  any such tax,
assessment,  charge or claim whose  amount,  applicability  or validity is being
contested  in good faith by  appropriate  proceedings  properly  instituted  and
diligently  conducted and in respect of which appropriate  reserves (in the good
faith judgment of management of the Company) are being  maintained in accordance
with GAAP.

                  Section 10.06. Maintenance of Properties.

                  The Company shall cause all material  properties  owned by the
Company or any of its Subsidiaries or used or held for use in the conduct of its
business or the business of any of its Subsidiaries to be maintained and kept in
good  condition,  repair and working order (ordinary wear and tear excepted) and
supplied  with all  necessary  equipment and will cause to be made all necessary
repairs, renewals, replacements, betterments and improvements thereof, all as in
the  reasonable  judgment of the Company may be consistent  with sound  business
practice and necessary so that the business  carried on in connection  therewith
may be properly conducted at all times; provided,  however, that nothing in this
Section shall prevent the Company from  discontinuing  the maintenance of any of
such  properties if such  discontinuance  is, in the reasonable  judgment of the
Company,  desirable in the conduct of its business or the business of any of its
Subsidiaries;  and provided,  further,  however,  that the  foregoing  shall not

                                 Page 85 of 162
<PAGE>

prohibit a sale, transfer or conveyance of a Subsidiary or any of its properties
or assets in compliance with the terms of this Indenture.

                  Section 10.07. Maintenance of Insurance.

                  The  Company  shall  at all  times  keep  all of its  and  its
Subsidiaries' properties which are of an insurable nature insured with insurers,
believed by the Company in good faith to be financially  sound and  responsible,
against  loss or damage to the extent  that  property  of similar  character  is
usually so insured by corporations similarly situated and owning like properties
in the same general  geographic  areas in which the Company and its Subsidiaries
operate,  except where the failure to do so could not  reasonably be expected to
have a  material  adverse  effect on the  condition  (financial  or  otherwise),
earnings,  business  affairs or prospects  of the Company and its  Subsidiaries,
taken as a whole.

                  Section 10.08. Limitation on Indebtedness.

                  (a)      The Company  shall not, and shall not cause or permit
any Subsidiary to, directly or indirectly,  Incur any  Indebtedness  (other than
the Notes); provided, however, that the Company may Incur Indebtedness,  and the
Company or any Subsidiary may Incur  Acquired  Indebtedness,  if, at the time of
such Incurrence,  the Debt to Annualized Operating Cash Flow Ratio would be less
than or equal to 6.0 to 1.0 prior to April 1, 2001, or less than or equal to 5.5
to 1.0 after April 1, 2001.

                  (b)      The foregoing  limitations  of paragraph  (a) of this
Section  10.08 will not apply to any of the  following,  each of which  shall be
given independent effect:

                           (i)      the  Incurrence by the Company or any of its
Subsidiaries of Indebtedness  (other than Acquired  Indebtedness)  consisting of
Capital  Lease  Obligations,  Purchase  Money  Obligations,  installment  sales,
mortgage  financings or other obligations  incurred for the purpose of financing
all or any part of the purchase price, cost of design, development, acquisition,
construction  or improvement of real or personal  property  (including,  without
limitation,   indefeasible  rights  of  use  or  similar  rights),  tangible  or
intangible,  used  or to be  used  in  connection  with  the  Telecommunications
Business or a credit facility or a master lease arrangement entered into for the
purpose of providing such financing,  provided that such Indebtedness (exclusive
of the interest  portion  thereof and  reasonable  costs of financing)  does not
exceed the lesser of Fair Market Value or the purchase  price and related  costs
of design, development,  acquisition, construction or improvement of such assets
or property at the time of such Incurrence.

                           (ii)     the Incurrence by the Company or any of its 
Subsidiaries of any  Indebtedness,  and any  refinancings  (as defined below) of
such  Indebtedness,   so  long  as  the  aggregate   principal  amount  of  such
Indebtedness shall not exceed $50 million at any one time outstanding;

                           (iii)    the    Incurrence   by    the   Company   of
Indebtedness (other than Acquired Indebtedness) in an aggregate principal amount
not to exceed 2.0 times the sum of the Net Cash Proceeds received by the Company
after the date of the  Indenture  (other than from the issuance of  Disqualified
Stock in any case) in  connection  with any Public  Equity  Offerings or sale of
Capital Stock (other than Disqualified  Stock) to any Strategic  Investor to the
extent that such Net Cash Proceeds have not been used pursuant to clause (a)(ii)
or (b)(viii) of Section 10.09;  provided that such  Indebtedness does not mature
prior to the  Stated  Maturity  of the  Notes or has an  Average  Life to Stated
Maturity at least equal to the Notes;

                           (iv)     the  Incurrence   by   the   Company  or any
Subsidiary of any  Indebtedness  entered into in the ordinary course of business
(a) pursuant to Interest Rate Agreements  entered into to protect the Company or
any Subsidiary against fluctuations in interest rates in respect of Indebtedness
of 


                                 Page 86 of 162
<PAGE>

the Company or any Subsidiary as long as the notional  principal  amount of such
Interest Rate  Agreements do not exceed the aggregate  principal  amount of such
Indebtedness  then  outstanding,  (b) under any  Currency  Hedging  Arrangements
entered into to protect the Company or any Subsidiary  against  fluctuations  in
the value of any currency or (c) under any Commodity Price Protection Agreements
entered into to protect the Company or any Subsidiary  against  fluctuations  in
the price of any commodity;

                           (v)      the  Incurrence  by  the  Company  or any of
its  Subsidiaries  of  Indebtedness  in respect of bid,  performance  or advance
payment bonds, standby letters of credit and appeal or surety bonds entered into
in the ordinary  course of business and not in connection  with the borrowing of
money;

                           (vi)     Indebtedness  outstanding under the Notes or
the Indenture (or  Guarantees  of the Notes issued under the  Indenture),  other
Indebtedness  existing  on the  date  of the  Indenture  or  other  Indebtedness
represented by shares of Series B Preferred Stock issued on or after the date of
the Indenture as a dividend on shares of Series B Preferred Stock outstanding on
the date of the  Indenture  (or shares of Series B Preferred  Stock  issued as a
dividend in respect of any such shares of additional Series B Preferred Stock so
issued);

                           (vii)    the Incurrence of  (a)  Indebtedness  of any
Subsidiary  owed to and  held  by the  Company  or  another  Subsidiary  and (b)
Indebtedness of the Company owed to and held by any Subsidiary or represented by
a guarantee of Indebtedness of any Subsidiary which such Subsidiary is otherwise
permitted  to Incur  under the  Indenture;  provided  that upon  either  (i) the
transfer or other disposition by a Subsidiary or the Company of any Indebtedness
so  permitted  to a Person  other than the Company or a  Subsidiary  or (ii) the
issuance,  sale,  transfer or other  disposition of Capital Stock  (including by
amalgamation,  consolidation  or  merger) of a  Subsidiary  (such that upon such
sale,  transfer or other  disposition  such Subsidiary  would no longer meet the
definition of a Subsidiary)  to a Person other than the Company or a Subsidiary,
the  provisions  of this  clause  (vii)  shall no longer be  applicable  to such
Indebtedness and such Indebtedness  shall be deemed to have been Incurred at the
time of such issue, sale, transfer or other disposition;

                           (viii)   Indebtedness incurred  by the Company or any
Subsidiary under a Permitted  Credit Facility or Debt Securities,  provided that
the aggregate  principal amount at any time outstanding under this clause (viii)
does not exceed $150 million;

                           (ix)     any  amendments, supplements, modifications,
deferrals,  renewals,  extensions,  substitutions,  refundings,  refinancings or
replacements  (collectively,  a "refinancing") of any Indebtedness  described in
clauses (i), (ii),  (iii),  (vi),  (vii) and (viii) above, and this clause (ix),
including  any  successive  refinancings  so long  as the  borrower  under  such
refinancing is the Company or, if not the Company,  the same as the borrower (or
its successor) of the Indebtedness being refinanced and the aggregate  principal
amount of Indebtedness and accrued interest represented thereby (or the accreted
value  thereof  as of  the  date  of  refinancing)  is  not  increased  by  such
refinancing  plus the  lesser of (I) the stated  amount of any  premium or other
payment  required to be paid in connection  with such a refinancing  pursuant to
the terms of the Indebtedness  being refinanced or (II) the amount of premium or
other payment actually paid at such time to refinance the Indebtedness, plus, in
either case, the amount of expenses of the Company or such borrower  incurred in
connection  with  such  refinancing  and,  in the  case  of any  refinancing  of
Indebtedness  that is Subordinated  Indebtedness,  such new Indebtedness is made
subordinated to the Notes at least to the same extent as the Indebtedness  being
refinanced  and such  refinancing  does not  reduce the  Average  Life to Stated
Maturity or the Stated Maturity of such Subordinated Indebtedness.

          (c) For purposes of determining any particular  amount of Indebtedness
under this covenant,  Guarantees,  Liens or obligations  with respect to letters
ofcredit supporting Indebtedness



                                 Page 87 of 162




otherwise included in the determination of such
particular amount shall not be included;  provided,  however, that the foregoing
shall not in any way be deemed to limit the provisions of Section 10.13.

                  (d)      For  purposes  of determining  compliance  with  this
covenant,  in the event that an item of Indebtedness may be Incurred through the
first  paragraph  of this  covenant or by meeting the criteria of one or more of
the types of Indebtedness described in the second paragraph of this covenant (or
the definitions of the terms used therein), the Company, in its sole discretion,
(i) may classify such item of Indebtedness  under and comply with either of such
paragraphs (or any of such  definitions),  as applicable,  (ii) may classify and
divide  such item of  Indebtedness  into more  than one of such  paragraphs  (or
definitions),  as applicable, and (iii) may elect to comply with such paragraphs
(or definitions), as applicable, in any order.

                  Section 10.09. Limitation on Restricted Payments.

                  (a)      The  Company  shall  not, and  shall  not  permit any
Subsidiary to, directly or indirectly:

                           (i)      declare or pay any  dividend on, or make any
distribution on any shares of the Company's  Capital Stock (other than dividends
or distributions  payable solely in shares of its Qualified  Capital Stock or in
options,  warrants or other rights to acquire shares of such  Qualified  Capital
Stock);

                           (ii)     purchase, redeem  or  otherwise  acquire  or
retire for value,  directly or  indirectly,  the Company's  Capital Stock or any
Capital Stock of any  Affiliate of the Company  (other than Capital Stock of any
Wholly-Owned Subsidiary of the Company) or options,  warrants or other rights to
acquire such Capital Stock;

                           (iii)    make    any   principal    payment  on,   or
repurchase, redeem, defease, retire or otherwise acquire for value, prior to any
scheduled principal payment,  sinking fund payment or maturity, any Subordinated
Indebtedness;

                           (iv)     declare or pay any dividend or  distribution
on any  Capital  Stock of any  Subsidiary  to any Person  (other than (a) to the
Company or any of its Wholly-  Owned  Subsidiaries  or (b) to all holders of any
class, series or the same type of Capital Stock of such Subsidiary on a pro rata
basis);  provided  that  in the  case  of  this  clause  (b)  such  dividend  or
distribution shall not constitute Indebtedness or Disqualified Stock;

                           (v)      make  any  Investment  in any  Person (other
than any  Permitted  Investments)  (any of the  foregoing  actions  described in
clauses (i) through (v), other than any such action that is a Permitted  Payment
(as defined below), collectively, "Restricted Payments") (the amount of any such
Restricted  Payment, if other than cash, as determined by the Board of Directors
of the Company, whose determination shall be conclusive and evidenced by a board
resolution),  unless (1) immediately  before and immediately after giving effect
to such proposed Restricted Payment on a pro forma basis, no Default or Event of
Default  shall have  occurred  and be  continuing;  (2)  immediately  before and
immediately after giving effect to such Restricted Payment on a pro forma basis,
the Company could incur $1.00 of additional  Indebtedness  (other than Permitted
Indebtedness) under the provisions described in Section 10.08(a);  and (3) after
giving effect to the proposed  Restricted  Payment,  the aggregate amount of all
such  Restricted  Payments  declared or made after the date of the date  hereof,
does not exceed the sum of the following:

                                 Page 88 of 162
<PAGE>



          (A) (i) the Cumulative  Operating Cash Flow  determined at the time of
such  Restricted  Payment  less(ii)  150% of  cumulative  Consolidated  Interest
Expense  determined for the period (treated as one accounting period) commencing
on the date of the original issue of the Notes and ending on the last day of the
most recent fiscal  quarter  immediately  preceding the date of such  Restricted
Payment for which consolidated  financial information of the Company is required
to be available;

                                    (B) the aggregate Net Cash Proceeds received
after the date of this Indenture by the Company from
the  issuance  or sale  (other  than to any of its  Subsidiaries)  of  Qualified
Capital Stock of the Company or any options, warrants or rights to purchase such
Qualified  Capital Stock of the Company  (except to the extent such proceeds are
used to  purchase,  redeem or otherwise  retire  Capital  Stock or  Subordinated
Indebtedness as set forth below in clause (ii) or (iii) of paragraph (b) below);

                                    (C) the aggregate Net Cash Proceeds received
after the date of this Indenture by the Company
(other than from any of its  Subsidiaries)  upon the  exercise  of any  options,
warrants or rights to purchase Qualified Capital Stock of the Company;

                                    (D) the aggregate Net Cash Proceeds received
after the date of this Indenture by the Company
from the  conversion  or  exchange,  if any, of debt  securities  or  Redeemable
Capital Stock of the Company or its Subsidiaries  into or for Qualified  Capital
Stock of the Company  plus,  to the extent such debt  securities  or  Redeemable
Capital Stock were issued after the date of this Indenture, the aggregate of Net
Cash Proceeds from their original issuance; and

                                    (E)  in  the  case  of  the  disposition  or
repayment of any Investment constituting a Restricted
Payment,  an amount  equal to the lesser of (x) the cash return of capital  with
respect to such Investment  (less the cost of disposition and taxes, if any) and
(y) the initial amount of such Investment.

                  (b)      Notwithstanding  the foregoing,  and  in  the case of
clauses  (ii)  through  (vi)  below,  so long as there is no Default or Event of
Default  continuing,  the foregoing  provisions shall not prohibit the following
actions  (each of clauses (i)  through  (vi) being  referred to as a  "Permitted
Payment"):

                           (i)      the payment of any dividend  within  60 days
after  the date of  declaration  thereof,  if at such date of  declaration  such
payment was  permitted by the  provisions  of paragraph  (a) of this Section and
such  payment  shall  have  been  deemed  to have  been  paid  on  such  date of
declaration;

                           (ii)     the   repurchase,   redemption,   or   other
acquisition  or retirement for value of any shares of any class of Capital Stock
of the Company in exchange  for  (including  any such  exchange  pursuant to the
exercise of a conversion  right or privilege  in  connection  with which cash is
paid in lieu of the issuance of fractional  shares or scrip),  or out of the Net
Cash Proceeds of a  substantially  concurrent  issuance and sale for cash (other
than to a  Subsidiary)  of,  other  shares  of  Qualified  Capital  Stock of the
Company; provided that the Net Cash Proceeds from the issuance of such shares of
Qualified Capital Stock are excluded from clause (3)(B) of paragraph (a) of this
Section 10.09;

                           (iii)    the  repurchase,   redemption,   defeasance,
retirement or acquisition for value or payment of principal of any  Subordinated
Indebtedness or Redeemable Capital Stock in exchange for, or in an amount not in
excess of the Net Cash Proceeds of, a substantially concurrent issuance and sale
for cash (other than to any Subsidiary of the Company) of any Qualified  Capital
Stock of the Company,  provided  that the Net Cash Proceeds from the issuance of
such shares of  Qualified  Capital  Stock are  excluded  from  clause  (3)(B) of
paragraph (a) of this Section 10.09;

                                 Page 89 of 162
<PAGE>



                           (iv)     the  repurchase,   redemption,   defeasance,
retirement,  refinancing,  acquisition  for value or payment of principal of any
Subordinated  Indebtedness  (other than  Redeemable  Capital  Stock) through the
substantially  concurrent  issuance  of  new  Subordinated  Indebtedness  of the
Company,  provided that any such new Subordinated Indebtedness (1) shall be in a
principal  amount that does not exceed the principal amount and accrued interest
thereon  so  refinanced  or  the  accreted  value  thereof  as of  the  date  of
refinancing (or, if such Subordinated  Indebtedness  provides for an amount less
than the principal  amount  thereof to be due and payable upon a declaration  of
acceleration  thereof, then such lesser amount as of the date of determination),
plus the  lesser  of (I) the  stated  amount  of any  premium  or other  payment
required to be paid in connection with such a refinancing  pursuant to the terms
of the  Indebtedness  being  refinanced  or (II) the  amount of premium or other
payment  actually  paid at such time to refinance  the  Indebtedness,  plus,  in
either case, the amount of expenses of the Company  incurred in connection  with
such  refinancing;  (2) has an Average Life to Stated Maturity  greater than the
remaining  Average  Life to  Stated  Maturity  of the  Notes;  (3) has a  Stated
Maturity  for its  final  scheduled  principal  payment  later  than the  Stated
Maturity  for the final  scheduled  principal  payment of the Notes;  and (4) is
expressly  subordinated  in right of  payment  to the Notes at least to the same
extent as the Subordinated Indebtedness to be refinanced;

                           (v)      the   repurchase,  redemption,   defeasance,
retirement,  refinancing,  acquisition  for value or payment  of any  Redeemable
Capital Stock through the  substantially  concurrent  issuance of new Redeemable
Capital  Stock of the Company,  provided  that any such new  Redeemable  Capital
Stock (1) shall have an aggregate  liquidation  preference  that does not exceed
the aggregate  liquidation  preference of the amount so  refinanced;  (2) has an
Average  Life to Stated  Maturity  greater  than the  remaining  Average Life to
Stated  Maturity  of the  Notes;  and (3) has a Stated  Maturity  later than the
Stated Maturity for the final scheduled principal payment of the Notes;

                           (vi)     the  repurchase  of  shares  of, or  options
to purchase  shares of,  common stock of the Company or any of its  Subsidiaries
from  employees,  officers,  consultants  or directors or any former  employees,
officers, consultants or directors of the Company or any of its Subsidiaries (or
permitted transferees of such employees,  officers,  consultants or directors or
former employees, officers, consultants or directors),  pursuant to the terms of
the  agreements  (including  employment  agreements)  or  plans  (or  amendments
thereto)  or  other  arrangements  or  transactions  approved  by the  Board  of
Directors  under  which such  individuals  purchase  or sell or are  granted the
option to purchase or sell, shares of such common stock; provided, however, that
the aggregate  amount of such  repurchases in any calendar year shall not exceed
$1 million and $3 million in the aggregate pursuant to this clause (vi);

                           (vii)    the  (a)    payment  of  dividends  on   the
Company's Series B Preferred Stock (in the form of cash or additional  shares of
Series B Preferred Stock) in an aggregate amount not to exceed $3 million in any
calendar  year  (provided  that such amounts  may, to the extent not  previously
paid, be aggregated  through the period prior to the conversion or redemption of
such  Series B  Preferred  Stock) and (b)  redemption  of any shares of Series B
Preferred Stock  outstanding on the date of the Indenture  (including any shares
of Series B  Preferred  Stock  issued on or after the date of the  Indenture  as
dividends thereon or in respect of such additional shares so issued) pursuant to
the terms of such shares of Series B Preferred Stock as in effect on the date of
the Indenture (or as such terms may be amended, from time to time, to the extent
that any such amendment has been  determined by the Board of Directors,  in good
faith, not to adversely affect the holders of the Notes);

                           (viii)   Investments   in    any    Person    engaged
principally in the Telecommunications  Business on the date of such Investments;
provided that the aggregate amount of any such Investments made pursuant to this
clause (viii) does not exceed the sum of (A) the amount of the Net Cash Proceeds
received  by  the  Company  after  the  date  of  the  Indenture  as  a  capital
contribution  or from the sale of its Capital  Stock  (other  than  Disqualified
Stock) to a Person who is not a Subsidiary of the 



                                 Page 90 of 162
<PAGE>

Company,  except to the  extent  that such Net Cash  Proceeds  are used to Incur
Indebtedness  pursuant to Section  10.08(b)(iii) or to make Restricted  Payments
pursuant to Section  10.09(a)(3),  or Section  10.09(b) (ii), (iii) or (iv) plus
(B) the net  reduction  in  Investments  made  pursuant  to this  clause  (viii)
resulting from  distributions  on or repayments of such  Investments or from the
Net Cash Proceeds from the sale of any such Investments  (except in each case to
the extent any such  payments or proceeds  are  included in the  calculation  of
Consolidated Net Income) or from such Person becoming a Wholly-Owned  Subsidiary
(valued in each case as provided in the definition of "Permitted Investments");

                           (ix)     the payment or declaration of  any  dividend
or the  making  of  any  distribution  on or the  redemption  of  rights  or any
securities issued pursuant to the Company Rights Agreement;

                           (x)      the  payment of cash in lieu of the issuance
of  fractional  shares  pursuant  to any  agreement,  warrant  or option and any
repurchase or other acquisition of fractional shares from time to time; and

                           (xi)     the  acquisition  of Capital  Stock  of  the
Company by the Company in connection with the cashless  exercise of any options,
warrants or similar rights issued by the Company on or prior to January 1, 1998.

                  In determining the amount of Restricted  Payments  permissible
under this covenant,  amounts  expended  pursuant to clauses (i),  (vi),  (vii),
(viii),  (ix) and (x) shall be  included,  without  duplication,  as  Restricted
Payments  and  shall not be  deemed a  Permitted  Payment  for  purposes  of the
calculation required by paragraph (a) of this Section 10.09.

                  Section 10.10. Limitation on Transactions with Affiliates.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Subsidiaries to, directly or indirectly, enter into any transaction or series of
related  transactions  (including,   without  limitation,  the  sale,  purchase,
exchange or lease of assets,  property or  services)  with or for the benefit of
any  Affiliate  of  the  Company  (other  than  the  Company  or a  Wholly-Owned
Subsidiary) unless such transaction or series of related transactions is entered
into in good faith and in writing and (a) such  transaction or series of related
transactions  is on terms  that are no less  favorable  to the  Company  or such
Subsidiary,  as the case may be, than those that would be reasonably expected to
be  available in a  comparable  transaction  in  arm's-length  dealings  with an
unrelated third party,  (b) with respect to any transaction or series of related
transactions  involving  aggregate  value in excess of $5  million,  the Company
delivers  an  Officers'   Certificate  to  the  Trustee   certifying  that  such
transaction  or series of related  transactions  complies with clause (a) above,
and (c) with  respect  to any  transaction  or  series of  related  transactions
involving aggregate value in excess of $10 million,  either (A) such transaction
or series  of  related  transactions  has been  approved  by a  majority  of the
Disinterested  Directors  of the  Company,  or in the  event  there  is only one
Disinterested  Director,  by such  Disinterested  Director,  or (B) the  Company
delivers  to the  Trustee a written  opinion of an  investment  banking  firm of
national  standing  or  other  recognized  independent  expert  with  experience
appraising  the terms and  conditions  of the type of  transaction  or series of
related  transactions  for  which  an  opinion  is  required  stating  that  the
transactions  or series of related  transactions  is fair to the Company or such
Subsidiary from a financial point of view; provided, however, that this covenant
shall  not  apply  to:  (a)   compensation,   severance  and  employee   benefit
arrangements  with any officer,  director or employee of the Company,  including
under any stock  option or stock  incentive  plans,  in the  ordinary  course of
business;  (b) any  transaction  solely  between or among the Company and/or any
Subsidiaries,  if such  transaction  otherwise does not violate the terms of the
Indenture;  (c) any transaction  otherwise permitted by the terms of the section
of the Indenture  described in Section 10.09;  (d) the execution and delivery of
or  payments  made under any tax sharing  agreement  between or among any of 



                                 Page 91 of 162
<PAGE>

the Company and any  Subsidiary;  (e)  licensing or  sublicensing  of use of any
intellectual  property by the Company or any Subsidiary to the Company any other
Subsidiary of the Company or to any Permitted  Joint Venture;  provided that the
licensor  shall  continue  to have access to such  intellectual  property to the
extent  necessary  for the  conduct  of its  business  and,  in the  case of any
Permitted  Joint Venture,  that the terms of any such  arrangement  are fair and
reasonable to the Company or any such  Subsidiary as determined in good faith by
the Board of Directors;  (f) arrangements between the Company and any Subsidiary
of the Company  for the  purpose of  providing  services  or  employees  to such
Subsidiary;  and (g) transactions  undertaken  pursuant to the IXC Agreement and
other agreements entered into in connection  therewith and in effect on the date
hereof (or as such other  agreements  may be amended,  from time to time, to the
extent that any such amendment has been determined by the Board of Directors, in
good faith, not to adversely affect the holders of the Notes).

                  Section 10.11. Limitation on Liens.

                  The Company shall not, and shall not permit any Subsidiary to,
directly or  indirectly,  create,  incur or affirm any Lien of any kind upon any
property  or assets  (including  any  intercompany  notes) of the Company or any
Subsidiary owned on the date hereof,  or acquired after the date hereof,  or any
income or profits  therefrom,  unless the Notes are directly secured equally and
ratably  with (or,  in the case of  Subordinated  Indebtedness,  prior or senior
thereto, with the same relative priority as the Notes shall have with respect to
such Subordinated Indebtedness) the obligation or liability secured by such Lien
except for any Permitted Liens.

                  Section 10.12. Limitation on Sale of Assets.

                  (a)      The Company  will  not,  and will not  permit  any of
its Subsidiaries to, directly or indirectly, consummate an Asset Sale unless (i)
at least 75% of the  consideration  from such Asset Sale is  received in cash or
other comparable  consideration  (as described  below),  and (ii) the Company or
such Subsidiary  receives  consideration at the time of such Asset Sale at least
equal to the Fair  Market  Value of the  shares or assets  subject to such Asset
Sale (as  determined by the Board of Directors of the Company and evidenced in a
board  resolution).  The  following  types  of  consideration  shall  be  deemed
"comparable   consideration"  for  the  purposes  of  this  covenant:  (A)  Cash
Equivalents,  (B)  liabilities  (contingent  or  otherwise)  of the Company or a
Subsidiary  assumed by the transferee (or its designee) such that the Company or
such Subsidiary has no further liability therefor, and (C) any securities, notes
or other  obligations  received by the Company or any such  Subsidiary from such
transferee  that within 60 days after  receipt,  are converted by the Company or
such Subsidiary into cash.

                  (b)      The Company or a  Subsidiary  may, within 365 days of
the Asset  Sale,  invest the Net Cash  Proceeds  thereof  in  Telecommunications
Assets or to repay any Pari Passu  Indebtedness of the Company or any Subsidiary
(including  the  repurchase of Notes).  The amount of such Net Cash Proceeds not
used or  invested  within  365  days of the  Asset  Sale  as set  forth  in this
paragraph constitutes "Excess Proceeds." 

                  (c)      When the  aggregate amount of Excess Proceeds exceeds
$10 million,  the Company will apply the Excess Proceeds to the repayment of the
Notes and any other Pari Passu Indebtedness  outstanding with similar provisions
requiring  the Company to make an offer to purchase such  Indebtedness  with the
proceeds  from any Asset Sale as follows:  (A) the Company will make an offer to
purchase  (an  "Offer")  from all  holders of the Notes in  accordance  with the
procedures set forth in the Indenture in the maximum principal amount (expressed
as a multiple  of $1,000) of Notes that may be  purchased  out of an amount (the
"Note  Amount")  equal to the product of such Excess  Proceeds  multiplied  by a
fraction,  the  numerator of which is the  outstanding  principal  amount of the
Notes,  and the  denominator  of which is the sum of the  outstanding  principal
amount of the Notes and such Pari Passu  



                                 Page 92 of 162
<PAGE>

Indebtedness  (subject  to  proration  in the event such amount is less than the
aggregate  Offered Price (as defined  herein) of all Notes  tendered) and (B) to
the extent required by such Pari Passu  Indebtedness  to permanently  reduce the
principal amount of such Pari Passu Indebtedness, the Company will make an offer
to purchase or otherwise  repurchase or redeem Pari Passu  Indebtedness (a "Pari
Passu Offer") in an amount (the "Pari Passu Debt Amount") equal to the excess of
the Excess  Proceeds  over the Note Amount;  provided  that in no event will the
Company  be  required  to make a Pari Passu  Offer in a Pari  Passu Debt  Amount
exceeding the principal amount of such Pari Passu  Indebtedness  plus the amount
of any premium  required to be paid to repurchase such Pari Passu  Indebtedness.
The offer price for the Notes will be payable in cash in an amount equal to 100%
of the principal amount of the Notes plus accrued and unpaid  interest,  if any,
to the date (the "Offer Date") such Offer is consummated (the "Offered  Price"),
in  accordance  with the  procedures  set forth  herein.  To the extent that the
aggregate Offered Price of the Notes tendered pursuant to the Offer is less than
the  Note  Amount  relating  thereto  or the  aggregate  amount  of  Pari  Passu
Indebtedness that is purchased in a Pari Passu Offer is less than the Pari Passu
Debt Amount,  the Company  will use any  remaining  Excess  Proceeds for general
corporate  purposes.  If the aggregate  principal amount of Notes and Pari Passu
Indebtedness  surrendered  by  holders  thereof  exceeds  the  amount  of Excess
Proceeds,  the  Trustee  shall  select the Notes to be  purchased  on a pro rata
basis. Upon the completion of the purchase of all the Notes tendered pursuant to
an Offer  and the  completion  of a Pari  Passu  Offer,  the  amount  of  Excess
Proceeds, if any, shall be reset at zero.

                  (d)      If  the  Company  becomes obligated  to make an Offer
pursuant to clause (c) above, the Notes and the Pari Passu Indebtedness shall be
purchased by the Company,  at the option of the holders thereof,  in whole or in
part in integral multiples of $1,000, on a date that is not earlier than 30 days
and not  later  than 60 days  from the date the  notice of the Offer is given to
holders,  or such later date as may be necessary  for the Company to comply with
the requirements under the Exchange Act.

                  (e)      The Company will comply with the  applicable  tender 
offer  rules,  including  Rule  14e-1  under  the  Exchange  Act,  and any other
applicable securities laws or regulations in connection with an Offer.

                  Section  10.13.  Limitation  on  Issuances  of  Guarantees  of
Indebtedness.

                  (a)      The Company will not permit any Subsidiary,  directly
or  indirectly,  to guarantee,  assume or in any other manner become liable with
respect to any Pari  Passu  Indebtedness  or  Subordinated  Indebtedness  of the
Company  unless  such   Subsidiary   simultaneously   executes  and  delivers  a
supplemental  indenture to this Indenture providing for a Guarantee of the Notes
on the same terms as the  guarantee  of such  Indebtedness  except that (A) such
guarantee need not be secured unless required  pursuant to Section 10.11 and (B)
if such  Indebtedness is by its terms expressly  subordinated to the Notes,  any
such assumption, guarantee or other liability of such Subsidiary with respect to
such Indebtedness  shall be subordinated to such  Subsidiary's  Guarantee of the
Notes at least to the same extent as such  Indebtedness  is  subordinated to the
Notes;  provided  that  this  paragraph  shall  not  apply to any  guarantee  or
assumption of liability of Indebtedness permitted under clauses (i), (ii), (iv),
(v), (vii) and (viii) of paragraph (b) of Section 10.08.

                  (b)      Notwithstanding the  foregoing, any  Guarantee  by  a
Subsidiary  of the  Notes  shall  provide  by its  terms  that it (and all Liens
securing  the same) shall be  automatically  and  unconditionally  released  and
discharged upon any sale,  exchange or transfer,  to any Person not an Affiliate
of  the  Company,  of  all  of  the  Company's  Capital  Stock  in,  or  all  or
substantially  all the assets  of,  such  Subsidiary,  which  transaction  is in
compliance  with the terms of this  Indenture and pursuant to which  transaction
such  Subsidiary  is  released  from  all  guarantees,  if any,  by it of  other
Indebtedness of the Company or any Subsidiaries.

                                 Page 93 of 162
<PAGE>


                  Section 10.14. Purchase of Notes upon a Change of Control.

                  (a)      If a Change of Control shall occur at any time,  then
each Holder shall have the right to require  that the Company  purchase all such
Holder's  Notes  in whole  or in part in  integral  multiples  of  $1,000,  at a
purchase  price (the "Change of Control  Purchase  Price") in cash, in an amount
equal to 101% of the  principal  amount of such Notes or portion  thereof,  plus
accrued and unpaid  interest,  if any, to the date of purchase  (the  "Change of
Control Purchase  Date"),  pursuant to the offer described below in this Section
10.14  (the  "Change  of  Control  Offer")  and in  accordance  with  the  other
procedures set forth in subsections (b), (c), (d) and (e) of this Section 10.14.

                  (b)      Within 30 days of any Change of Control, the Company 
shall notify the Trustee  thereof and give written  notice (a "Change of Control
Purchase  Notice") of such Change of Control to each Holder by first-class mail,
postage prepaid,  at his or her address appearing in the Note Register,  stating
among other things:

                                    (1)     that   a   Change   of   Control has
occurred,  the date of such event, and that such Holder has the right to require
the Company to repurchase such Holder's Notes at the Change of Control  Purchase
Price;

                                    (2)     the circumstances and relevant facts
 regarding such Change of Control;

                                    (3)     that the Change of Control  Offer is
being made pursuant to this Section 10.14 and that all Notes  properly  tendered
pursuant  to the Change of Control  Offer will be  accepted  for  payment at the
Change of Control Purchase Price;

                                    (4)     the Change of Control Purchase Date,
which shall be a Business Day no earlier than 30 days and not later than 60 days
from the date such  notice is  mailed,  or such later  date as is  necessary  to
comply with requirements under the Exchange Act;

                                    (5)     the   Change  of   Control  Purchase
Price;

                                    (6)     the   names   and  addresses  of the
Paying Agent and the offices or agencies referred to in Section 10.02;

                                    (7)     that Notes  must be  surrendered  on
or prior to the  Change of  Control  Purchase  Date to the  Paying  Agent at the
office of the  Paying  Agent or to an office or agency  referred  to in  Section
10.02 to collect payment;

                                    (8)  that the  Change  of  Control  Purchase
Price for any Note which has been properly  tendered and not  withdrawn  will be
paid promptly following the Change of Control Offer Purchase Date;

                                    (9)     the  procedures  that a Holder  must
follow to accept a Change of Control Offer or to withdraw such acceptance;

                                    (10)  that  any  Note  not   tendered   will
continue to accrue interest; and

                                    (11) that,  unless the  Company  defaults in
the payment of the Change of Control  Purchase  Price,  any Notes  accepted  for
payment  pursuant to the Change of Control Offer shall cease to accrue  interest
after the Change of Control Purchase Date.

                                 Page 94 of 162
<PAGE>


                  (c)      Upon receipt by the Company  of  the proper tender of
Notes,  the Holder of the Note in respect of which such  proper  tender was made
shall  (unless  the tender of such Note is  properly  withdrawn)  thereafter  be
entitled to receive solely the Change of Control  Purchase Price with respect to
such Note.  Upon surrender of any such Note for purchase in accordance  with the
foregoing  provisions,  such Note shall be paid by the  Company at the Change of
Control Purchase Price;  provided,  however, that installments of interest whose
Stated  Maturity is on or prior to the Change of Control  Purchase Date shall be
payable  to the  Holders  of  such  Notes,  or one or  more  Predecessor  Notes,
registered as such on the relevant  Regular Record Dates  according to the terms
and the  provisions  of Section  3.09.  If any Note  tendered  for  purchase  in
accordance  with the  provisions of this Section 10.14 shall not be so paid upon
surrender thereof,  the principal thereof (and premium,  if any, thereon) shall,
until paid,  bear interest from the Change of Control  Purchase Date at the rate
borne by such Note. Holders electing to have Notes purchased will be required to
surrender such Notes to the Paying Agent at the address  specified in the Change
of  Control  Purchase  Notice  prior to 5:00 p.m.  (New York  time) at least one
Business Day prior to the Change of Control  Purchase  Date. Any Note that is to
be purchased  only in part shall be  surrendered to a Paying Agent at the office
of such Paying Agent (with, if the Company, the Note Registrar or the Trustee so
requires,  due  endorsement  by, or a written  instrument  of  transfer  in form
satisfactory  to the Company and the Note Registrar or the Trustee,  as the case
may be,  duly  executed by the Holder  thereof or such  Holder's  attorney  duly
authorized  in writing),  and the Company  shall  execute and the Trustee  shall
authenticate  and deliver to the Holder of such Note,  without service charge to
the Holder, one or more new Notes of any authorized denomination as requested by
such Holder in an aggregate  principal amount equal to, and in exchange for, the
portion  of the  principal  amount  of  the  Note  so  surrendered  that  is not
purchased.

                  (d)      The Company  shall (i) not  later  than the Change of
Control  Purchase Date,  accept for payment Notes or portions  thereof  tendered
pursuant  to the Change of Control  Offer,  (ii) not later than 12:00 a.m.  (New
York time) on the Change of Control  Purchase Date,  deposit with the Trustee or
with a Paying  Agent an amount of money in same day funds (or New York  Clearing
House  funds if such  deposit is made  prior to the  Change of Control  Purchase
Date)  sufficient to pay the aggregate  Change of Control  Purchase Price of all
the Notes or  portions  thereof  which are to be  purchased  as of the Change of
Control Purchase Date and (iii) not later than 12:00 a.m. (New York time) on the
Change of  Control  Purchase  Date,  deliver to the  Paying  Agent an  Officers'
Certificate  stating the aggregate principal amount of Notes or portions thereof
being purchased by the Company.  The Paying Agent shall promptly mail or deliver
to Holders  of Notes so  accepted  payment  in an amount  equal to the Change of
Control  Purchase Price of the Notes  purchased  from each such Holder,  and the
Company shall execute and the Trustee shall  promptly  authenticate  and mail or
deliver to such Holders a new Note equal in principal  amount to any unpurchased
portion of the Note  surrendered.  Any Notes not so  accepted  shall be promptly
mailed or delivered by the Paying Agent at the  Company's  expense to the Holder
thereof. The Company will publicly announce the results of the Change of Control
Offer on the Change of Control  Purchase  Date.  For  purposes  of this  Section
10.14, the Company shall choose a Paying Agent which shall not be the Company.

                  (e)      A  tender  made  in  response  to a Change of Control
Purchase Notice may be withdrawn if the Company or its agent receives, not later
than 5:00 p.m.  (New York time) one  Business Day prior to the Change of Control
Purchase Date, a signed letter, delivered to the address specified in the change
of Control Purchase Notice specifying, as applicable:

                                    (1)     the name of the Holder;

                                    (2)     the certificate  number  of the Note
in respect of which such notice of withdrawal is being submitted;


                                 Page 95 of 162
<PAGE>
                                    (3)     the principal  amount  of  the  Note
(which shall be $1,000 or an integral multiple  thereof)  delivered for purchase
by the Holder as to which such notice of withdrawal is being submitted;

                                    (4)     a   statement  that  such  Holder is
withdrawing  his election to have such principal  amount of such Note purchased;
and

                                    (5)     the   principal  amount,  if any, of
such Note (which shall be $1,000 or an integral  multiple  thereof) that remains
subject to the original  Change of Control  Purchase Notice and that has been or
will be delivered for purchase by the Company.

                  (f)      Subject to applicable  escheat  laws, the Trustee and
the Paying Agent shall  return to the Company any cash that  remains  unclaimed,
together  with  interest or  dividends,  if any,  thereon,  held by them for the
payment of the Change of Control Purchase Price; provided, however, that, (x) to
the extent that the aggregate  amount of cash deposited by the Company  pursuant
to clause (ii) of paragraph (d) above  exceeds the  aggregate  Change of Control
Purchase  Price of the  Notes or  portions  thereof  to be  purchased,  then the
Trustee shall hold such excess for the Company and (y) unless otherwise directed
by the Company in writing,  promptly after the Business Day following the Change
of Control Purchase Date the Trustee shall return any such excess to the Company
together with interest, if any, thereon.

                  (g)      The Company shall comply, to  the extent  applicable,
with the applicable tender offer rules,  including Rule 14e-1 under the Exchange
Act, and any other applicable  securities laws or regulations in connection with
a Change of Control Offer.

                  Notwithstanding  the  foregoing,   the  Company  will  not  be
required to make a Change of Control  Offer if a third party makes the Change of
Control Offer, in the manner,  at the times and otherwise in compliance with the
requirements set forth in this Indenture applicable to a Change of Control Offer
made by the  Company  and  purchases  all the  Notes  validly  tendered  and not
withdrawn under such Change of Control Offer.

                  Section 10.15. Limitation on Sale-Leaseback Transactions.

                  (a)      The  Company  wil   not,  and  will  not  permit  any
Subsidiary  of  the  Company  to,   directly  or  indirectly,   enter  into  any
Sale-Leaseback  Transaction  with respect to any property or assets (whether now
owned or hereafter  acquired),  unless (i) the sale or transfer of such property
or assets  to be  leased  is  treated  as an Asset  Sale and  complies  with the
provisions  of Section  10.12 and (ii) the Company or such  Subsidiary  would be
entitled  under  Section  10.08  to  incur  any  Indebtedness  (with  the  lease
obligations   being  treated  as  Indebtedness   for  purposes  of  ascertaining
compliance  with this  covenant  unless such lease is properly  classified as an
operating lease under GAAP) in respect of such Sale-Leaseback Transaction.

                  (b)      The foregoing restriction   does  not  apply  to  any
Sale-Leaseback  Transaction if (i) the lease is for a period,  including renewal
rights, not in excess of three years; (ii) the transaction is solely between the
Company and any Wholly Owned Subsidiary or any  Wholly-Owned  Subsidiary and any
other Wholly-Owned  Subsidiary;  and (iii) the transaction is consummated within
180 days of the  acquisition by the Company or its Subsidiary of the property or
assets subject to such  sale-leaseback or entered into within 180 days after the
purchase or  substantial  completion  of the  construction  of such  property or
assets  (or 270  days  in the  event  that  the  only  condition  delaying  such
consummation is the receipt of applicable regulatory approvals).

                                 Page 96 of 162
<PAGE>


                  Section  10.16  Limitation  on Issuance and Sale of Subsidiary
Capital Stock.

                  The Company will not permit (a) any  Subsidiary of the Company
to issue any Capital Stock, except for (i) Capital Stock issued or sold to, held
by or transferred to the Company or a Wholly-Owned Subsidiary,  and (ii) Capital
Stock issued by a Person prior to the time (A) such Person becomes a Subsidiary,
(B) such Person merges with or into a Subsidiary or (C) a Subsidiary merges with
or into such Person; provided that such Capital Stock was not issued or incurred
by such  Person  in  anticipation  of the type of  transaction  contemplated  by
subclause  (A), (B) or (C)  (excluding  for purposes of this proviso,  shares of
Capital Stock issued in connection with customary accelerated vesting provisions
contained in option or similar plans or agreements  which are  accelerated  as a
result of a change of control of such Person and which  option or similar  plans
were not adopted or implemented  solely in anticipation of or in connection with
such  transaction)  or (b) any Person (other than the Company or a  Wholly-Owned
Subsidiary) to acquire  Capital Stock of any Subsidiary  from the Company or any
Subsidiary,  except,  in the case of clause (a) or (b), (1) upon the acquisition
of all the  outstanding  Capital Stock of such Subsidiary in accordance with the
terms hereof,  (2) if, immediately after giving effect to such issuance or sale,
such Subsidiary would no longer  constitute a Subsidiary,  and any Investment in
such Person  remaining  after giving  effect to such issuance or sale would have
been  permitted to be made under the  provisions of Section 10.09 if made on the
date of such issuance or sale, (3) issuances of director's qualifying shares, or
sales to foreign  nationals of shares of Capital Stock of foreign  Subsidiaries,
to the extent  required by applicable  law or to maintain the limited  liability
status of such foreign  Subsidiaries  or, (4) issuances or sales of common stock
of a Subsidiary,  provided that the Company or such  Subsidiary  applies the Net
Cash Proceeds, if any, in a manner which does not violate the provisions of this
Indenture to the extent  applicable  (excluding  for  purposes of this  proviso,
shares of Capital Stock issued in connection with customary  accelerated vesting
provisions  contained  in  option  or  similar  plans or  agreements  which  are
accelerated  as a result of a change of control of such Person and which  option
or similar plans were not adopted or implemented solely in anticipation of or in
connection with such transaction).

                  Section  10.17  Limitation  on  Dividends  and  Other  Payment
Restrictions Affecting Subsidiaries.

                  The  Company  will  not,  and  will  not  permit  any  of  its
Subsidiaries to, directly or indirectly,  create or otherwise cause or suffer to
exist or become  effective any  encumbrance or restriction on the ability of any
Subsidiary  to (i) pay dividends or make any other  distribution  on its Capital
Stock,  (ii) pay any Indebtedness  owed to the Company or any other  Subsidiary,
(iii)  make any  Investment  in the  Company  or any  other  Subsidiary  or (iv)
transfer any of its properties or assets to the Company or any other Subsidiary,
except for:

                  (a)      any encumbrance or restriction,  with  respect  to  a
Subsidiary that is not a Subsidiary of the Company on the date of the Indenture,
in existence at the time such Person becomes a Subsidiary of the Company and not
incurred in connection  with,  or in  contemplation  of, such Person  becoming a
Subsidiary;

                  (b)      encumbrances or restrictions

                           (i)      by reason of applicable law,

                           (ii)     under this Indenture, or

                           (iii)  in  any  agreement,  instrument  or  indenture
governing  or  relating  to  Indebtedness  in  respect of any  Permitted  Credit
Facility;

                                 Page 97 of 162
<PAGE>


                  (c)      customary  non-assignment  provisions of any contract
or lease of any Subsidiary entered into in the ordinary course of business;

                  (d)      encumbrances or  restrictions  imposed   pursuant  to
Indebtedness or contracts  entered into in connection with Permitted  Liens, but
solely to the extent such encumbrances or restrictions affect property or assets
subject to such Permitted Lien;

                  (e)      any  encumbrance or  restriction imposed pursuant  to
contracts  for the sale of assets with respect to the assets to be sold pursuant
to such contract; and

                  (f)      any encumbrance  or  restriction existing  under  any
agreement that extends,  renews,  refunds  refinances or replaces the agreements
containing the encumbrances or restrictions in the foregoing clauses (a) through
(e), or in this clause (f),  provided that the terms and  conditions of any such
encumbrances or  restrictions  are no more  restrictive in any material  respect
than those under or pursuant to the agreement  evidencing  the  Indebtedness  so
extended, renewed, refinanced or replaced.

                  Section 10.18 Limitations on Unrestricted Subsidiaries.

                  The   Company   will  not  make,   and  will  not  permit  its
Subsidiaries  to make, any Investment in  Unrestricted  Subsidiaries  if, at the
time thereof,  the aggregate amount of such Investments  would exceed the amount
of Restricted  Payments then permitted to be made pursuant to Section 10.09. Any
Investments in Unrestricted  Subsidiaries  permitted to be made pursuant to this
covenant will be treated as a Restricted  Payment in  calculating  the amount of
Restricted Payments made by the Company.

                  Section 10.19 Provision of Financial Statements.

                  After the earlier to occur of the consummation of the Exchange
Offer and the 150th  calendar day  following  the date of original  issue of the
Notes,  whether or not the  Company is subject to Section  13(a) or 15(d) of the
Exchange Act, the Company will, to the extent  permitted under the Exchange Act,
file  with the  Commission  the  annual  reports,  quarterly  reports  and other
documents which the Company would have been required to file with the Commission
pursuant  to  Sections  13(a) or  15(d) if the  Company  were so  subject,  such
documents to be filed with the Commission on or prior to the date (the "Required
Filing  Date") by which the  Company  would have been  required  so to file such
documents if the Company were so subject. The Company will also in any event (x)
within 15 days of each Required Filing Date (i) transmit by mail to all Holders,
as their names and addresses  appear in the Note Register,  without cost to such
Holders and (ii) file with the Trustee copies of the annual  reports,  quarterly
reports and other  documents  which the Company would have been required to file
with the  Commission  pursuant to Sections 13(a) or 15(d) of the Exchange Act if
the  Company  were  subject to either of such  Sections  and (y) if filing  such
documents by the Company with the Commission is not permitted under the Exchange
Act,  promptly  upon  written  request  and  payment of the  reasonable  cost of
duplication  and delivery,  supply copies of such  documents to any  prospective
Holder at the Company's cost. If any Guarantor's  financial  statements would be
required to be included in the financial  statements filed or delivered pursuant
to this  Indenture if the Company were subject to Section  13(a) or 15(d) of the
Exchange Act, the Company shall include such Guarantor's financial statements in
any filing or delivery pursuant to the Indenture. In addition, so long as any of
the Notes remain outstanding, the Company will make available to any prospective
purchaser  of Notes or  beneficial  owner of Notes in  connection  with any sale
thereof the information  required by Rule  144A(d)(4)  under the Securities Act,
until the earlier of such time as the Company has completed  its Exchange  Offer
or such time as the Holders  thereof have disposed of such Notes  pursuant to an
effective registration statement under the Securities Act.

                                 Page 98 of 162
<PAGE>



                  Section 10.20.     Statement by Officers as to Default.

                  (a)      The Company will deliver to the Trustee, on or before
a date not more than 120 days after the end of each  fiscal  year of the Company
ending after the date hereof,  and 60 days after the end of each fiscal  quarter
ending  after the date  hereof,  a  written  statement  signed by the  principal
executive officer,  principal financial officer or principal  accounting officer
of the  Company  in his or her  capacity  as an officer  of the  Company,  as to
compliance herewith,  including whether or not, after a review of the activities
of the  Company  during  such  year  and of the  Company's  performance  and the
performance  of each  Guarantor,  if any,  under  this  Indenture,  to the  best
knowledge  (based on such review) of the signers  thereof,  the Company and each
Guarantor, if any, have fulfilled all of their respective obligations and are in
compliance  with all  conditions and covenants  under this Indenture  throughout
such year  and,  if there has been a Default  specifying  each  Default  and the
nature and status  thereof  and any  actions  being  taken by the  Company  with
respect thereto.

                  (b)      When any Default or Event of Default has occurred and
is continuing,  or if the Trustee or any Holder or the trustee for or the holder
of any other evidence of Indebtedness of the Company or any Subsidiary gives any
notice or takes any other action with respect to a claimed default,  the Company
shall  deliver to the  Trustee by  registered  or  certified  mail or  facsimile
transmission followed by an originally executed copy of an Officers' Certificate
specifying such Default,  Event of Default,  notice or other action,  the status
thereof and what  actions the Company is taking or proposes to take with respect
thereto, within five Business Days after the occurrence of such Default or Event
of Default.

                  Section 10.21 Waiver of Certain Covenants.

                  The Company may omit in any particular instance to comply with
any covenant or condition set forth in Sections 10.06 through  10.11,  10.12(a),
10.13,  10.15  through  10.20 and 10.22,  if,  before or after the time for such
compliance,  the  Holders of not less than a  majority  in  aggregate  principal
amount of the Notes at the time Outstanding shall, by Act of such Holders, waive
such  compliance in such  instance with such covenant or provision,  but no such
waiver shall extend to or affect such covenant or condition except to the extent
so  expressly  waived,  and,  until such  waiver  shall  become  effective,  the
obligations  of the Company and the duties of the Trustee in respect of any such
covenant or condition shall remain in full force and effect.

                  Section 10.22 Limitation on Business.

                  The  Company  will  not,  and  will  not  permit  any  of  the
Subsidiaries   to,  engage  in  a  business   which  is  not   substantially   a
Telecommunications Business.

                  Section 10.23 Deposit of Funds with Escrow Agent.

                  (a)      On the Issue Date, the Company shall deposit with the
Escrow Agent funds in the amount of  $138,700,000.  All Collateral shall be held
in the Escrow  Account  until  permitted to be disbursed  pursuant to the Escrow
Agreement  and then shall be  disbursed  strictly in  accordance  with the terms
thereof.

                  (b)      Pending release of  the  Escrow  Funds as provided in
the Escrow  Agreement,  the Escrow  Funds will be  invested  in U.S.  Government
Securities  or  temporarily  in Cash  Equivalents,  of the type  referred  to in
clauses (ii) and (iv) of the definition  thereof,  as  specifically  directed in
writing  by the  Company.  Any  interest  or other  profit  resulting  from such
investment will be deposited in the Escrow Account.

                                 Page 99 of 162
<PAGE>


                                   ARTICLE XI
                               Redemption of Notes

                  Section 11.01. Rights of Redemption.

                  (a)      The  Notes are  subject  to  redemption  at any  time
on or after  February  15, 2002,  at the option of the  Company,  in whole or in
part, subject to the conditions,  and at the Redemption Prices, specified in the
form of  Note,  together  with  accrued  and  unpaid  interest,  if any,  to the
Redemption  Date (subject to the right of Holders of record on relevant  Regular
Record  Dates and  Special  Record  Dates to receive  interest  due on  relevant
Interest Payment Dates and Special Payment Dates)

                  (b)      In addition,  at any time prior to February 15, 2001,
the Company may, at its option,  use the Net Cash Proceeds of one or more Public
Equity Offerings or the sale of Capital Stock (other than Disqualified Stock) of
the Company to a Strategic  Investor in a single  transaction  or in a series of
related  transactions,  to redeem  up to an  aggregate  of 35% of the  aggregate
principal amount of Notes originally issued under this Indenture at a redemption
price equal to 110.0% of the of the principal  amount thereof,  plus accrued and
unpaid interest thereon,  if any, to the Redemption Date; provided that at least
65% aggregate  principal amount of Notes remains  outstanding  immediately after
the occurrence of such redemption.  In order to effect the foregoing redemption,
the Company must mail a notice of  redemption no later than 45 after the closing
of the related Public Equity  Offering or sale to a Strategic  Investor and must
consummate  such  redemption  within 60 days of the closing of the Public Equity
Offering or sale to a Strategic Investor.

                  Section 11.02. Applicability of Article.

                  Redemption  of  Notes  at  the  election  of  the  Company  or
otherwise, as permitted or required by any provision of this Indenture, shall be
made in accordance with such provision and this Article XI.

                  Section 11.03. Election to Redeem; Notice to Trustee.

                  If the  Company  elects to redeem  Notes  pursuant  to Section
11.01,  it shall  furnish to the Trustee,  at least 15 but not more than 30 days
before notice of any redemption is to be mailed to Holders (or such shorter time
as may be  satisfactory  to the  Trustee),  (x) a Company Order and an Officer's
Certificate stating (i) that the Company has elected to redeem Notes pursuant to
Section  11.01,  (ii) the date notice of  redemption is to be mailed to Holders,
(iii) the redemption  date, (iv) the aggregate  principal  amount of Notes to be
redeemed,  (v) the redemption prices for such Notes and (vi) the amount, if any,
of accrued and unpaid interest  (including  Liquidated  Damages, if any) on such
Notes as of the  redemption  date and (y) an Opinion of Counsel that the Company
is entitled to redeem the Notes pursuant to Section 11.01.

                  Section 11.04. Selection by Trustee of Notes to Be Redeemed.

                  If less than all the Notes are to be redeemed,  the particular
Notes or portions thereof to be redeemed shall be selected not more than 30 days
prior to the  Redemption  Date.  The Trustee  shall select the Notes or portions
thereof to be redeemed pro rata, by lot or by any other method the Trustee shall
deem fair and reasonable. The amounts to be redeemed shall be equal to $1,000 or
any integral multiple thereof. The Trustee shall promptly notify the Company and
the Note Registrar in writing of the Notes  selected for redemption  and, in the
case of any Notes selected for partial redemption,  the principal amount thereof
to be redeemed. For all purposes of this Indenture, unless the context otherwise
requires,  all provisions  relating to redemption of Notes shall relate,  in the
case of any Note  redeemed or to be



                                Page 100 of 162
<PAGE>

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

                  Section 11.05. Notice of Redemption.

                  Notice  of  redemption  shall be given  by  first-class  mail,
postage prepaid, mailed not less than 30 days nor more than 60 days prior to the
Redemption  Date,  to each  Holder  of  Notes  to be  redeemed,  at its  address
appearing in the Note Register. All notices of redemption shall state:

                  (a)      the Redemption Date;

                  (b)      the Redemption Price;

                  (c)      if  less  than  all   Outstanding   Notes  are  to be
redeemed, the identification of the particular Notes to be redeemed;

                  (d)      in the  case  of a  Note  to  be  redeemed  in  part,
the principal  amount of such Note to be redeemed and that after the  Redemption
Date upon surrender of such Note,  new Note or Notes in the aggregate  principal
amount equal to the unredeemed portion thereof will be issued;

                  (e)      that Notes called for  redemption must be surrendered
to the Paying Agent to collect the Redemption Price;

                  (f)      that on the  Redemption  Date  the  Redemption  Price
will  become  due and  payable  upon  each such Note or  portion  thereof  to be
redeemed,  and  that  (unless  the  Company  shall  default  in  payment  of the
Redemption Price) interest thereon shall cease to accrue on and after said date;

                  (g)      the  names and addresses  of  the  Paying  Agent  and
the offices or agencies  referred to in Section 10.02 where such Notes are to be
surrendered for payment of the Redemption Price;

                  (h)      the CUSIP number, if any, relating to such Notes; and

                  (i)      the procedures that a Holder must follow to surrender
the Notes to be redeemed.  Notice of  redemption  of Notes to be redeemed at the
election  of the  Company  shall be given by the  Company  or, at the  Company's
written  request,  by the Trustee in the name and at the expense of the Company.
If the Company elects to give notice of redemption, it shall provide the Trustee
with a certificate  stating that such notice has been given in  compliance  with
the requirements of this Section 11.05.

                  The notice if mailed in the manner  herein  provided  shall be
conclusively  presumed  to have been given,  whether or not the Holder  receives
such notice.  In any case,  failure to give such notice by mail or any defect in
the notice to the Holder of any Note  designated for redemption as a whole or in
part shall not affect the validity of the  proceedings for the redemption of any
other Note.

                  Section 11.06. Deposit of Redemption Price.

                  On or prior to any Redemption  Date, the Company shall deposit
with the  Trustee  or with a Paying  Agent  (or,  if the  Company  or any of its
Affiliates is acting as Paying Agent, segregate and hold in trust as provided in
Section  10.03)  an  amount  of money in same day  funds  sufficient  to pay the
Redemption  Price of, and  (except if the  Redemption  Date shall be an Interest
Payment  Date or Special  Payment  Date)  accrued  interest on, all the Notes or
portions  thereof which are to be redeemed on that



                                Page 101 of 162
<PAGE>

date.  The Paying  Agent shall  promptly  mail or deliver to Holders of Notes so
redeemed  payment  in an  amount  equal to the  Redemption  Price  of the  Notes
purchased  from each such  Holder.  All money,  if any,  earned on funds held in
trust by the Trustee or any Paying Agent prior to the  Redemption  Date shall be
remitted to the Company.  For purposes of this Section 11.06,  the Company shall
choose a Paying Agent which shall not be the Company.

                  Section 11.07. Notes Payable on Redemption Date.

                  Notice of redemption having been given as aforesaid, the Notes
so to be redeemed shall, on the Redemption  Date,  become due and payable at the
Redemption  Price  therein  specified  and from and after such date  (unless the
Company  shall  default  in the  payment  of the  Redemption  Price and  accrued
interest) such Notes shall cease to bear  interest.  Holders will be required to
surrender the Notes to be redeemed to the Paying Agent at the address  specified
in the notice of  redemption  at least one Business Day prior to the  Redemption
Date.  Upon  surrender of any such Note for  redemption in accordance  with said
notice,  such Note shall be paid by the Company at the Redemption Price together
with  accrued  interest  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 Notes,  or one or more  Predecessor
Notes,  registered  as such on the  relevant  Regular  Record  Dates and Special
Record Dates according to the terms and the provisions of Section 3.09.

                  If any Note  called for  redemption  shall not be so paid upon
surrender  thereof for  redemption,  the principal and premium,  if any,  shall,
until paid,  bear  interest from the  Redemption  Date at the rate borne by such
Note.

                  Section 11.08. Notes Redeemed in Part.

                  Any  Note  which  is to be  redeemed  only  in part  shall  be
surrendered  to the  Paying  Agent at the office or agency  maintained  for such
purpose  pursuant to Section 10.02 (with, if the Company,  the Note Registrar or
the Trustee so requires, due endorsement by, or a written instrument of transfer
in form satisfactory to the Company,  the Note Registrar or the Trustee,  as the
case may be, duly executed by, the Holder thereof or such Holder's attorney duly
authorized  in writing),  and the Company shall  execute,  and the Trustee shall
authenticate  and deliver to the Holder of such Note without service  charge,  a
new Note or Notes, of any authorized denomination as requested by such Holder in
aggregate principal amount equal to, and in exchange for, the unredeemed portion
of the principal of the Note so surrendered that is not redeemed.

                                  ARTICLE XII
                           Satisfaction and Discharge

                  Section 12.01. Satisfaction and Discharge of Indenture.

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

                  (a)      either   (1)        all     the    Notes  theretofore
authenticated  and  delivered  (other than (i) lost,  stolen or destroyed  Notes
which have been  replaced or paid as provided in Section  3.08 or (ii) all Notes
whose payment has theretofore  been deposited in trust or segregated and held in
trust by the


                                Page 102 of 162
<PAGE>

Company and  thereafter  repaid to the Company or discharged  from such trust as
provided in Section 10.03) have been delivered to the Trustee for  cancellation;
or

                                    (2)     all   such   Notes  not  theretofore
delivered to the Trustee for cancellation (i) have become due and payable,  (ii)
will become due and payable at their  Stated  Maturity  within one year or (iii)
are to be called for redemption  within one year under  arrangements  reasonably
satisfactory  to the  Trustee  for the  giving of notice  of  redemption  by the
Trustee in the name, and at the expense, of the Company;  and the Company or any
Guarantor has  irrevocably  deposited or caused to be deposited with the Trustee
as trust funds in trust an amount in United States dollars sufficient to pay and
discharge the entire Indebtedness on the Notes not theretofore  delivered to the
Trustee for  cancellation,  including  the principal  of,  premium,  if any, and
accrued interest on, such Notes at such Maturity,  Stated Maturity or Redemption
Date;

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

                  (c)      the Company has delivered to the Trustee an Officers'
Certificate  and an  Opinion  of  Independent  Counsel,  in form  and  substance
reasonably  satisfactory  to the Trustee,  each stating that (i) all  conditions
precedent  herein relating to the  satisfaction  and discharge  hereof have been
complied  with and (ii) such  satisfaction  and  discharge  will not result in a
breach or violation of, or  constitute a default  under,  this  Indenture or any
other  material  agreement or instrument to which the Company,  any Guarantor or
any  Subsidiary  is a party  or by  which  the  Company,  any  Guarantor  or any
Subsidiary is bound.

                  Notwithstanding  the  satisfaction and discharge  hereof,  the
obligations  of the Company to the  Trustee  under  Section  6.06 and, if United
States dollars shall have been deposited with the Trustee  pursuant to subclause
(2) of subsection  (a) of this Section  12.01,  the  obligations  of the Trustee
under Section 12.02 and the last paragraph of Section 10.03 shall survive.

                  Section 12.02. Application of Trust Money.

                  Subject to the  provisions  of the last  paragraph  of Section
10.03, all United States dollars  deposited with the Trustee pursuant to Section
12.01  shall  be held in  trust  and  applied  by it,  in  accordance  with  the
provisions of the Notes and this Indenture,  to the payment,  either directly or
through any Paying Agent  (including the Company acting as its own Paying Agent)
as the Trustee may determine,  to the Persons entitled thereto, of the principal
of,  premium,  if any, and interest on, the Notes for whose  payment such United
States dollars have been deposited with the Trustee.

                                  ARTICLE XII
                             Collateral and Security

                  Section 13.01. Escrow Agreement.

                  The due and  punctual  payment  of the  first  five  scheduled
interest payments on the Notes, when and as the same shall be due and payable on
an Interest Payment Date or by acceleration  shall be secured as provided in the
Escrow  Agreement  which the  Company,  the Escrow  Agent and the  Trustee  have
entered  into  simultaneously  with the  execution of this  Indenture.  Upon the
acceleration  of the  Maturity  of the Notes prior to the payment in full of the
first five scheduled interest payments, the Escrow Agent shall, upon the receipt
of written notice from the Trustee, as agent for the Trustee, foreclose upon the
Collateral. Each Holder of Notes, by its acceptance thereof, consents and agrees
to the  terms  of the  Escrow  Agreement  (including,  without  limitation,  the
provisions providing for foreclosure and 



                                Page 103 of 162
<PAGE>

disbursement  of Collateral) as the same may be in effect or may be amended from
time to time in  accordance  with its terms and the terms hereof and  authorizes
and directs the Escrow Agent and the Trustee to enter into the Escrow  Agreement
and to perform its obligations and exercise its rights  thereunder in accordance
therewith.  The  Company  shall  deliver  to the  Trustee  copies of the  Escrow
Agreement,  and shall do or cause to be done all such acts and  things as may be
necessary  or proper,  or as may be  required  by the  provisions  of the Escrow
Agreement,  to assure and confirm to the Trustee  the  security  interest in the
Collateral  contemplated  by the Escrow  Agreement or any part thereof,  as from
time to time  constituted,  so as to render the same  available for the security
and benefit of this Indenture  with respect to, and of, the Notes,  according to
the intent and purposes  expressed in the Escrow  Agreement.  The Company  shall
take any and all actions  reasonably  required to cause the Escrow  Agreement to
create and maintain (to the extent possible under  applicable  law), as security
for the obligations of the Company hereunder,  a security interest in and on all
the  Collateral,  in favor of the  Trustee,  for the  benefit of the  Holders of
Notes.  Neither the Escrow Agent nor the Trustee  shall have any  responsibility
for perfecting or maintaining the perfection of the Trustee's  security interest
in the Collateral or for filing any instrument, document or notice in any public
office at any time or times.

                  Section 13.02. Recording and Opinions.

                  (a)      The   Company   shall   furnish   to   the    Trustee
simultaneously  with the execution and delivery of this  Indenture an Opinion of
Counsel  either (i) stating  that in the opinion of such  counsel all action has
been taken or such  action  which is  required  to be taken with  respect to the
recording,  registering  and filing of this Indenture,  financing  statements or
other  instruments  necessary to make effective a security  interest in favor of
the Trustee for the benefit of the Holders of the Notes, or (ii) stating that in
the opinion of such counsel no such action is  necessary  to make such  security
interest effective.

                  (b)      To the extent, if any, Section  314(b)  of the  Trust
Indenture  Act is  applicable,  the Company shall furnish to the Trustee on each
anniversary of the Issue Date (upon receipt of written notice from Escrow Agent)
until the date upon which the balance of Escrow Funds shall have been reduced to
zero,  an Opinion of Counsel,  dated as of such date,  complying in all respects
with Section 314(b) of the Trust Indenture Act.

                  Section 13.03. Release of Collateral.
 
                  (a)      Subject  to  subsections  (b),  (c) and (d) of   this
Section 13.03, the Collateral may be released from the security interest created
by the Escrow  Agreement  only in accordance  with the  provisions of the Escrow
Agreement.

                  (b)      Except  to the  extent  that  any  security  interest
on proceeds of  Collateral  is  automatically  released by  operation of Section
9-306 of the Uniform  Commercial Code or other similar law, no Collateral  shall
be released from the security interest created by the Escrow Agreement  pursuant
to the provisions of the Escrow Agreement,  other than as provided in the Escrow
Agreement.

                  (c)      At   any   time when  an Event of Default  shall have
occurred  and be  continuing  and the  Maturity  of the  Notes  shall  have been
accelerated  (whether by  declaration  or  otherwise),  no  Collateral  shall be
released pursuant to the provisions of the Escrow  Agreement,  and no release of
Collateral  in  contravention  of this  Section  13.03(c)  shall be effective as
against the Holders of Notes,  except for the  disbursement  of all Escrow Funds
(as  defined  in the  Escrow  Agreement)  and other  Collateral  to the  Trustee
pursuant to Section 6(b)(iv) of the Escrow Agreement.

                                Page 104 of 162
<PAGE>


                  (d)      To the extent, if any, applicable,  the Company shall
cause  Section  314(d) of the Trust  Indenture  Act,  relating to the release of
property or securities from the security interest of the Escrow Agreement, to be
complied with.

                  Section  13.04.  Authorization  of  Actions to Be Taken by the
Trustee Under the Escrow Agreement.

                  Subject to the  provisions  of Section 6.01 and Section  6.03,
the Trustee may,  without the consent of the Holders of Notes,  on behalf of the
Holders of Notes, take all actions it deems necessary or appropriate in order to
(a) enforce any of the terms of the Escrow Agreement and (b) collect and receive
any and all  amounts  payable  in  respect  of the  obligations  of the  Company
hereunder. The Trustee shall have power to institute and maintain such suits and
proceedings as it may deem expedient to prevent any impairment of the Collateral
by any acts that may be unlawful or in violation of the Escrow Agreement or this
Indenture,  and such suits and  proceedings as the Trustee may deem expedient to
preserve or protect its  interests and the interests of the Holders of Notes and
the Escrow Agent in the  Collateral  (including  power to institute and maintain
suits or  proceedings  to restrain the  enforcement  of or  compliance  with any
legislative  or  other  governmental  enactment,  rule  or  order  that  may  be
unconstitutional or otherwise invalid if the enforcement of, or compliance with,
such enactment, rule or order would impair the security interest hereunder or be
prejudicial to the interests of the Holders of Notes or of the Trustee).

                  Section  13.05.  Authorization  of  Receipt  of  Funds  by the
Trustee Under the Escrow Agreement.

                  The Trustee is authorized to receive any funds for the benefit
of the  Holders  of Notes  disbursed  under the  Escrow  Agreement,  and to make
further  distributions  of such funds to the Holders of Notes  according  to the
provisions of this Indenture.

                  Section 13.06. Termination of Security Interest.

                  Upon the  earliest  to occur of (i) the date  upon  which  the
balance of Escrow  Funds and other  Collateral  shall have been reduced to zero,
(ii) the  payment of the first five  scheduled  interest  payments on the Notes,
(iii) legal  defeasance of all  Outstanding  Notes  pursuant to Section 4.02 and
(iv) covenant  defeasance of all Outstanding Notes pursuant to Section 4.03, the
Trustee  shall,  at the written  request of the  Company,  release the  security
interest in the Collateral  pursuant to this Indenture and the Escrow  Agreement
upon the Company's  compliance  with the  provisions of the Trust  Indenture Act
pertaining to release of collateral.




                                Page 105 of 162
<PAGE>




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



                                    PSINET INC.


Attest:  /s/ David N. Kunkel        By:  /s/  Edward D. Postal
             Secretary              Name:  Edward D. Postal
                                    Title: Senior Vice President and 
                                           Chief Financial Officer



                                    WILMINGTON TRUST COMPANY


Attest:  /s/ Roseline K. Maney      By:   /s/ Bruce L. Bisson
              Asst. Secretary       Name:  Bruce L. Bisson
                                    Title: Vice President




                                Page 106 of 162
<PAGE>




                                    EXHIBIT A

                            REGULATION S CERTIFICATE

         (For transfers pursuant to Section 307(a)(i) of the Indenture)

Wilmington Trust Company
Rodney Square North
1100 North Market Street
Wilmington, DE 19890-0001

                  Re: 10% Senior Notes due 2005 of PSINet Inc. (the "Notes")

                  Reference is made to the Indenture, dated as of April 13, 1998
(the  "Indenture"),  between PSINet Inc. (the  "Company")  and Wilmington  Trust
Company,  as  Trustee.  Terms used  herein and  defined in the  Indenture  or in
Regulation S or Rule 144 under the U.S.  Securities Act of 1933 (the "Securities
Act") are used herein as so defined. This certificate relates to US$____________
principal amount of Notes,  which are evidenced by the following  certificate(s)
(the "Specified Notes"):

                                     CUSIP No(s). ___________________________

                                      CERTIFICATE No(s)._____________________

                  The person in whose name this  certificate  is executed  below
(the  "Undersigned")  hereby certifies that either (i) it is the sole beneficial
owner  of the  Specified  Notes  or  (ii)  it is  acting  on  behalf  of all the
beneficial  owners of the Specified  Notes and is duly  authorized by them to do
so. Such beneficial  owner or owners are referred to herein  collectively as the
"Owner."  The  Specified  Notes are  represented  by a Global  Note and are held
through the Depositary or an Agent Member in the name of the Undersigned,  as or
on behalf of the Owner.  The Owner has  requested  that the  Specified  Notes be
transferred to a person (the "Transferee") who will take delivery in the form of
a Regulation S Global Note. In connection  with such transfer,  the Owner hereby
certifies that,  unless such transfer is being effected pursuant to an effective
registration  statement  under  the  Securities  Act,  it is being  effected  in
accordance  with  Rule 904 or Rule 144  under  the  Securities  Act and with all
applicable  securities  laws  of the  states  of the  United  States  and  other
jurisdictions. Accordingly, the Owner hereby further certifies as follows:

                  (1)      Rule   904   Transfers.  If  the  transfer  is  being
effected in  accordance with Rule 904:

                           (A)      the   Owner  is  not a  distributor  of  the
Specified Notes, an affiliate of the Company or any such distributor or a person
acting on behalf of any of the foregoing;

                           (B)      the  offer  of  the Specified  Notes was not
made to a person in the United States;

                           (C)      either







                                       A-1

                                Page 107 of 162
<PAGE>


                                    (i)     at   the   time  the  buy  order was
originated,  the  Transferee  was outside the United States or the Owner and any
person acting on its behalf reasonably  believed that the Transferee was outside
the United States, or

                                    (ii)    the  transaction  is being  executed
in, on or through the  facilities  of the Eurobond  market,  as regulated by the
Association  of  International  Bond  Dealers,  or another  designated  offshore
securities market described in Rule 902(a) of Regulation S and neither the Owner
nor any  person  acting  on its  behalf  knows  that  the  transaction  has been
prearranged with a buyer in the United States;

                           (D)      no  "directed  selling  efforts"  within the
meaning of Rule 902(b) of Regulation S have been made in the United States by or
on behalf of the Owner or any affiliate thereof;

                           (E)      if the  Owner  is a  dealer  in  securities,
as defined in Section  2(12) of the  Securities  Act, or has  received a selling
concession, fee or other remuneration in respect of the Specified Notes, and the
transfer is to occur during the restricted period, then:

                                    (i)     neither  the   Owner  nor any person
acting on behalf of the Owner knows that the  Transferee of the Specified  Notes
is a U.S. person; and

                                    (ii)    if the Owner or any person acting on
the Owner's behalf knows that the Transferee is a dealer,  as defined in Section
2(12) of the Securities Act, or is a person receiving a selling concession,  fee
or other  remuneration in respect of the Specified  Notes, the Owner or a person
acting on the Owner's behalf has sent to the Transferee a confirmation  or other
notice  stating  that the  Specified  Notes may be offered  and sold  during the
Restricted  Period only:  (x) in accordance  with  Regulation S; (y) pursuant to
registration of the Specified Notes under the Securities Act; or (z) pursuant to
an available exemption from the registration requirements of the Securities Act;
and

                                    (iii)   the  transaction is  not  part  of a
plan or scheme to evade the registration requirements of the Securities Act.

                  (2)      Rule 144 Transfers.

                  If the transfer is being effected pursuant to Rule 144:

                           (A)      the  transfer  is  occurring after a holding
period of at least one year  (computed in accordance  with paragraph (d) of Rule
144) has elapsed  since the Specified  Notes were acquired by the Owner,  and is
being  effected in accordance  with the  applicable  amount,  manner of sale and
notice requirements of Rule 144; or

                           (B)      the transfer is occurring  after a holding 
period of at least two years has elapsed since the Specified Notes were acquired
by the Owner and the Owner is not, and during the preceding three months has not
been, an affiliate of the Company.


                                       A-2


                                Page 108 of 162
<PAGE>


                  This certificate and the statements  contained herein are made
for your benefit and the benefit of the Company and the Initial Purchasers.

Dated:  __________________

                  (Print the name of the Undersigned, as such term is defined in
the third paragraph of this certificate.)

By:_____________________________________________________
         Name:
         Title:

         (If the  Undersigned  is a corporation,  partnership or fiduciary,  the
title of the person signing on behalf of the Undersigned must be stated.)


                                      A-3

                                Page 109 of 162
<PAGE>




                                    EXHIBIT B

                          RESTRICTED NOTES CERTIFICATE


        (For transfers pursuant to Section 3.07(a)(ii) of the Indenture)

Wilmington Trust Company
Rodney Square North
1100 North Market Street
Wilmington, DE 19890-0001

                  Re: 10% Senior Notes due 2005 of PSINet Inc. (the "Notes")

                  Reference is made to the Indenture, dated as of April 13, 1998
(the  "Indenture"),  between PSINet Inc. (the  "Company")  and Wilmington  Trust
Company,  as Trustee.  Terms used herein and defined in the Indenture or in Rule
144A or Rule 144 under the U.S.  Securities Act of 1933 (the  "Securities  Act")
are used  herein as so defined.  This  certificate  relates to  US$_____________
principal amount of Notes,  which are evidenced by the following  certificate(s)
(the "Specified Notes"):

                           CUSIP No(s). ___________________________

                           ISIN No(s). (If any.)______________________

                           CERTIFICATE No(s). ____________________

                  The person in whose name this  certificate  is executed  below
(the  "Undersigned")  hereby certifies that either (i) it is the sole beneficial
owner  of the  Specified  Notes  or  (ii)  it is  acting  on  behalf  of all the
beneficial  owners of the Specified  Notes and is duly  authorized by them to do
so. Such beneficial  owner or owners are referred to herein  collectively as the
"Owner".  The  Specified  Notes are  represented  by a Global  Note and are held
through the Depositary or an Agent Member in the name of the Undersigned,  as or
on behalf of the Owner.  The Owner has  requested  that the  Specified  Notes be
transferred to a person (the "Transferee") who will take delivery in the form of
a Restricted Note. In connection with such transfer,  the Owner hereby certifies
that,   unless  such  transfer  is  being  effected  pursuant  to  an  effective
registration  statement  under  the  Securities  Act,  it is being  effected  in
accordance  with  Rule  144A  or  Rule  144  under  the  Securities  Act and all
applicable  securities  laws  of the  states  of the  United  States  and  other
jurisdictions.
Accordingly, the Owner hereby further certifies as follows:

                  (1)      Rule  144A  Transfers.  If   the  transfer  is  being
effected in accordance with Rule 144A:

                           (A)      the Specified Notes are being transferred to
a person that the Owner and any person acting on its behalf  reasonably  believe
is a "qualified  institutional buyer" within the meaning of Rule 144A, acquiring
for its own account or for the account of a qualified institutional buyer; and

                           (B)      the  Owner  and   any  person  acting on its
behalf have taken  reasonable  steps to ensure that the Transferee is aware that
the Owner may be relying on Rule 144A in connection with the transfer; and


                                       B-1

                                Page 110 of 162
<PAGE>




                  (2)      Rule 144 Transfers. If the transfer is being effected
 pursuant to Rule 144:

                           (A)      the  transfer is occurring  after  a holding
period of at least one year  (computed in accordance  with paragraph (d) of Rule
144) has elapsed  since the  Specified  Notes were  acquired by the Owner and is
being  effected in accordance  with the  applicable  amount,  manner of sale and
notice requirements of Rule 144; or

                           (B)      the transfer  is occurring  after a  holding
period of at least two years has elapsed since the Specified Notes were acquired
by the Owner,  and the Owner is not, and during the  preceding  three months has
not been, an affiliate of the Company.

                  This certificate and the statements  contained herein are made
for your benefit and the benefit of the Company and the Initial Purchasers.




Dated:

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

                  (Print the name of the Undersigned, as such term is defined in
the third paragraph of this certificate.)

By:_____________________________________________________
         Name:
         Title:

                  (If  the   Undersigned  is  a   corporation,   partnership  or
fiduciary,  the title of the person signing on behalf of the Undersigned must be
stated.)




                                       B-2

                                Page 111 of 162
<PAGE>


                                    EXHIBIT C

                         UNRESTRICTED NOTES CERTIFICATE

    (For removal of Securities Act Legends pursuant to Section 3.07(b)of the
                                   Indenture)


Wilmington Trust Company
Rodney Square North
1100 North Market Street
Wilmington, DE 19890-0001


                  Re: 10% Senior Notes due 2005 of PSINet Inc. (the "Notes")

Reference  is  made  to  the  Indenture,   dated  as  of  April  13,  1998  (the
"Indenture"),  between PSINet Inc. (the "Company") and Wilmington Trust Company,
as Trustee.  Terms used herein and defined in the Indenture or in Rule 144 under
the U.S.  Securities  Act of 1933 (the  "Securities  Act") are used herein as so
defined.

                  This certificate relates to US$_____________  principal amount
of Notes,  which are evidenced by the following  certificate(s)  (the "Specified
Notes"):

CUSIP No(s). __________________________

CERTIFICATE No(s). ____________________

                  The person in whose name this  certificate  is executed  below
(the  "Undersigned")  hereby certifies that either (i) it is the sole beneficial
owner  of the  Specified  Notes  or  (ii)  it is  acting  on  behalf  of all the
beneficial  owners of the Specified  Notes and is duly  authorized by them to do
so. Such beneficial  owner or owners are referred to herein  collectively as the
"Owner".  If the Specified Notes are represented by a Global Note, they are held
through the Depositary or an Agent Member in the name of the Undersigned,  as or
on behalf of the Owner.  If the Specified  Notes are not represented by a Global
Note, they are registered in the name of the Undersigned, as or on behalf of the
Owner.  The Owner has requested that the Specified  Notes be exchanged for Notes
bearing  no  Private  Placement  Legend  pursuant  to  Section  3.07(b)  of  the
Indenture. In connection with such exchange, the Owner hereby certifies that the
exchange is occurring  after a holding period of at least two years (computed in
accordance with paragraph (d) of Rule 144) has elapsed since the Specified Notes
were acquired by the Owner, and the Owner is not, and during the preceding three
months has not been,  an affiliate of the Company.  The Owner also  acknowledges
that any future transfers of the Specified Notes must comply with all applicable
securities laws of the states of the United States and other jurisdictions.

                  This certificate and the statements  contained herein are made
for your benefit and the benefit of the Company and the Initial Purchasers.

Dated:  _________________

                  (Print the name of the Undersigned, as such term is defined in
the third paragraph of this certificate.)


By:____________________________________
         Name:
         Title:

                                      C-1

                                Page 112 of 162
<PAGE>



                  (If  the   Undersigned  is  a   corporation,   partnership  or
fiduciary,  the title of the person signing on behalf of the Undersigned must be
stated.)



                                      C-2

                                Page 113 of 162
<PAGE>



                                   APPENDIX I

                            [FORM OF TRANSFER NOTICE]

                  FOR VALUE RECEIVED, the undersigned  registered  holder hereby
sell(s), assign(s) and transfer(s) unto

Insert Taxpayer  Identification   No.   ________________________________________
- --------------------------------------------------------------------------------
__________________________________________________________________________
(Please  print or  typewrite  name and address  including  zip code of assignee)
__________________________________________________________________________   the
within  Note and all rights  thereunder,  hereby  irrevocably  constituting  and
appointing _____________________________________________________________________
attorney  to transfer  such Note on the books of the Company  with full power of
substitution  in the premises.  [THE  FOLLOWING  PROVISION TO BE INCLUDED ON ALL
CERTIFICATES   FOR   SERIES  A  NOTES   EXCEPT   PERMANENT   OFFSHORE   PHYSICAL
CERTIFICATES].  In connection  with any transfer of this Note occurring prior to
the date which is the earlier of the date of an effective Registration Statement
or April 13, 1999, the undersigned  confirms that without  utilizing any general
solicitation or general advertising that:

                  [Check One]

                  [_]  (a)  this  Note  is  being   transferred   in  compliance
with the  exemption  from  registration  under the  Securities  Act of 1933,  as
amended, provided by Rule 144A thereunder or

                  [_]  (b)  this  Note  is  being   transferred  other  than  in
accordance  with (a) above and documents are being  furnished  which comply with
the conditions of transfer set forth in this Note and the Indenture.  If none of
the foregoing boxes is checked, the Trustee or other Note Registrar shall not be
obligated to register  this Note in the name of any Person other than the Holder
hereof unless and until the conditions to any such transfer of registration  set
forth herein and in Section 3.07 of the Indenture shall have been satisfied.

Date: ________________________________________________________


NOTICE:  The  signature  to this  assignment  must  correspond  with the name as
written upon the face of the  within-mentioned  instrument in every  particular,
without alteration or any change whatsoever.

Signature Guarantee:

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

[Signature must be guaranteed by an eligible Guarantor Institution (banks, stock
brokers,  savings and loan associations and credit unions) with membership in an
approved  guarantee  medallion  program  pursuant  to  Securities  and  Exchange
Commission Rule 17Ad-15.]

 TO BE  COMPLETED  BY  PURCHASER  IF  (a)  ABOVE  IS  CHECKED.  The  undersigned
represents  and warrants that it is purchasing  this Note 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, as amended,  and is aware
that the sale 



                                Page 114 of 162
<PAGE>

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  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 authorized signatory




                                Page 115 of 162
<PAGE>




                                   APPENDIX II

                         FORM OF TRANSFEREE CERTIFICATE

           I or we assign and transfer this Note to:

           Please insert social security or other identifying number of assignee

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

           Print or type name, address and zip code of assignee

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

and   irrevocably   appoint   __________________________________________________
[Agent],  to  transfer  this  Note on the  books of the  Company.  The Agent may
substitute another to act for him.

Dated  __________________________

Signed  _________________________

                  (Sign  exactly as name appears on the other side of this Note)
[Signature must be guaranteed by an eligible Guarantor Institution (banks, stock
brokers,  savings and loan associations and credit unions) with membership in an
approved  guarantee  medallion  program  pursuant  to  Securities  and  Exchange
Commission Rule 17 Ad-15]




                                Page 116 of 162



                                                                     Exhibit 4.2



                              SERIES A GLOBAL NOTE

                  THIS NOTE (OR ITS  PREDECESSOR)  HAS NOT BEEN REGISTERED UNDER
THE U.S.  SECURITIES  ACT OF 1933,  AS  AMENDED  (THE  "SECURITIES  ACT"),  AND,
ACCORDINGLY,  MAY NOT BE OFFERED,  SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHIN
THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS,  EXCEPT
AS SET FORTH IN THE NEXT SENTENCE.  BY ITS ACQUISITION HEREOF OR OF A BENEFICIAL
INTEREST HEREIN, THE HOLDER:

                  (1)  REPRESENTS  THAT  (A)  IT IS A  "QUALIFIED  INSTITUTIONAL
                  BUYER" (AS DEFINED IN RULE 144A UNDER THE  SECURITIES  ACT) (A
                  "QIB")  OR  (B) IT  HAS  ACQUIRED  THIS  NOTE  IN AN  OFFSHORE
                  TRANSACTION  IN  COMPLIANCE   WITH   REGULATION  S  UNDER  THE
                  SECURITIES ACT,

                  (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE  TRANSFER THIS
                  NOTE EXCEPT (A) TO THE COMPANY OR ANY OF ITS SUBSIDIARIES, (B)
                  TO A  PERSON  WHOM THE  SELLER  REASONABLY  BELIEVES  IS A QIB
                  PURCHASING  FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QIB IN
                  A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (C) IN AN
                  OFFSHORE  TRANSACTION  MEETING THE REQUIREMENTS OF RULE 903 OR
                  904 OF THE  SECURITIES  ACT, (D) IN A TRANSACTION  MEETING THE
                  REQUIREMENTS  OF RULE 144 UNDER  THE  SECURITIES  ACT,  (E) IN
                  ACCORDANCE  WITH  ANOTHER   EXEMPTION  FROM  THE  REGISTRATION
                  REQUIREMENTS  OF THE SECURITIES ACT (AND BASED UPON AN OPINION
                  OF COUNSEL  ACCEPTABLE  TO THE  COMPANY) OR (F) PURSUANT TO AN
                  EFFECTIVE   REGISTRATION  STATEMENT  AND,  IN  EACH  CASE,  IN
                  ACCORDANCE WITH THE APPLICABLE SECURITIES LAWS OF ANY STATE OF
                  THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION AND

                  (3) AGREES  THAT IT WILL  DELIVER TO EACH  PERSON TO WHOM THIS
                  NOTE  OR  AN   INTEREST   HEREIN  IS   TRANSFERRED   A  NOTICE
                  SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

                  AS USED HEREIN,  THE TERMS "OFFSHORE  TRANSACTION" AND "UNITED
STATES"  HAVE THE MEANINGS  GIVEN TO THEM BY RULE 902 OF  REGULATION S UNDER THE
SECURITIES  ACT. THE  INDENTURE  CONTAINS A PROVISION  REQUIRING  THE TRUSTEE TO
REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING.

                  THIS NOTE IS A GLOBAL NOTE WITHIN THE MEANING OF THE INDENTURE
HEREINAFTER  REFERRED  TO AND IS  REGISTERED  IN THE NAME OF A  DEPOSITARY  OR A
NOMINEE OF A DEPOSITARY OR A SUCCESSOR DEPOSITARY. TRANSFERS OF THIS GLOBAL NOTE
SHALL BE LIMITED TO TRANSFERS IN WHOLE,  BUT NOT IN PART,  TO NOMINEES OF CEDE &
CO. OR TO A  SUCCESSOR  THEREOF OR SUCH  SUCCESSOR'S  



                                Page 117 of 162
<PAGE>

NOMINEE AND  TRANSFERS  OF
PORTIONS OF THIS GLOBAL NOTE SHALL BE LIMITED TO  TRANSFERS  MADE IN  ACCORDANCE
WITH THE RESTRICTIONS SET FORTH IN SECTIONS 3.06 AND 3.07 OF THE INDENTURE.

                  UNLESS  THIS   CERTIFICATE   IS  PRESENTED  BY  AN  AUTHORIZED
REPRESENTATIVE OF THE DEPOSITARY TRUST COMPANY, A NEW YORK CORPORATION  ("DTC"),
TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER,  EXCHANGE,  OR PAYMENT
AND ANY SUCH  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.




                                Page 118 of 162
<PAGE>





                                   PSINET INC.


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


                       10% SENIOR NOTE DUE 2005, SERIES A

                            CUSIP NO. ______________

                     No. __________ $_______________________


                  PSINet  Inc.,  a  New  York  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  _______________
United  States  dollars on  February  15,  2005,  at the office or agency of the
Company  referred to below,  and to pay interest thereon from April 13, 1998, or
from the most recent  Interest  Payment Date to which  interest has been paid or
duly  provided  for,  semiannually  on August 15 and  February 15, in each year,
commencing August 15, 1998 at the rate of 10% per annum,  subject to adjustments
as described in the second following paragraph,  in United States dollars, until
the principal hereof is paid or duly provided for. Interest shall be computed on
the basis of a 360-day year comprised of twelve 30-day months.

                  The Holder of this Series A Note is  entitled to the  benefits
of the  Registration  Rights  Agreement  between  the  Company  and the  Initial
Purchasers,  dated as of April 13, 1998, pursuant to which, subject to the terms
and  conditions  thereof,  the Company is obligated to  consummate  the Exchange
Offer pursuant to which the Holder of this Note shall have the right to exchange
this Note for 10% Senior Notes due 2005,  Series B (herein  called the "Series B
Notes") in like principal amount as provided therein. The Series A Notes and the
Series B Notes are together referred to as the "Notes".  The Series A Notes rank
pari passu in right of payment with the Series B Notes.

                  In  the  event  that  (a)  the  Exchange  Offer   Registration
Statement is not filed with the  Commission on or prior to the date specified in
the Registration Rights Agreement, (b) the Exchange Offer Registration Statement
is not declared  effective on or prior to the date specified in the Registration
Rights  Agreement,  (c) the Exchange Offer is not consummated on or prior to the
date specified in the Registration  Rights  Agreement,  (d) if obligated to file
the  Shelf  Registration  Statement,   the  Company  fails  to  file  the  Shelf
Registration  Statement with the Commission on or prior to the date specified in
the  Registration  Rights  Agreement,   (e)  if  obligated  to  file  the  Shelf
Registration  Statement,  the  Shelf  Registration  Statement  is  not  declared
effective  on or  prior  to  the  date  specified  in  the  Registration  Rights
Agreement,  or (f)  the  Shelf  Registration  Statement  or the  Exchange  Offer
Registration  Statement  is  declared  effective  but  thereafter  ceases  to be
effective or usable in connection  with resales of the Series A Notes during the
periods specified in the Registration Rights Agreement (each such event referred
to in clauses (a) through (f) above, a  "Registration  Default"),  to the extent
permitted by applicable  law, the Company agrees to pay to each Holder of Series
A Notes liquidated  damages  ("Liquidated  Damages") in an amount equal to $0.05
per week per $1,000 in  principal  amount of Series A Notes held by such  Holder
for each week or portion thereof that the Registration Default continues for the
first 90 day period  immediately  following the occurrence of such  Registration
Default.  To the extent permitted by law, the amount of Liquidated Damages shall
increase  by an  additional  $0.05 per week per  $1,000 in  principal  amount of
Series  A Notes  with  respect  to  each  subsequent  90 day  period  until  all
Registration  Defaults  have been cured,  up to a maximum  amount of  Liquidated
Damages of $0.50 per week per $1,000 in 



                                Page 119 of 162
<PAGE>

principal  amount of Series A Notes.  The  Company  shall not be required to pay
Liquidated  Damages  for more than one  Registration  Default at any given time.
Following  the cure of all  Registration  Defaults,  the  accrual of  Liquidated
Damages shall cease. All accrued Liquidated Damages shall be paid by the Company
to holders entitled  thereto by wire transfer to the accounts  specified by them
or by mailing checks to their  registered  address if no such accounts have been
specified.

                  The interest so payable,  and punctually paid or duly provided
for, on any Interest Payment Date will, as provided in the Indenture hereinafter
referred  to, be paid to the Person in whose name this Note (or any  Predecessor
Notes) is  registered  at the close of business  on the Regular  Record Date for
such  interest,  which  shall be the August 1 or  February  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, and interest on
such defaulted interest at the interest rate borne by the Series A Notes, to the
extent lawful, shall forthwith cease to be payable to the Holder on such Regular
Record  Date,  and may  either be paid to the Person in whose name this Note (or
any  Predecessor  Notes) 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 Notes not less than 10 days
prior to such Special  Record  Date,  or be paid at any time in any other lawful
manner not  inconsistent  with the  requirements  of any securities  exchange on
which the Notes may be listed,  and upon such  notice as may be required by this
Indenture not inconsistent  with the requirements of such exchange,  all as more
fully provided in this Indenture.

                  Payment of the principal of, premium, if any, and interest on,
this Note,  and exchange or transfer of the Note,  will be made at the office or
agency of the Company in the City of New York maintained for that purpose (which
initially  will be the Trustee c/o Harris  Trust  Company of New York,  77 Water
Street,  New  York,  NY  10005),  or at such  other  office  or agency as may be
maintained  for such  purpose,  or, at the  option of the  Company,  payment  of
interest  may be made by check  mailed to the  address  of the  Person  entitled
thereto as such address shall appear on the Note  Register,  and provided,  that
payment by wire transfer of  immediately  available  funds will be required with
respect to principal of and interest on all Global Notes and all other Notes the
Holders of which shall have provided wire transfer  instructions  to the Company
or the Paying  Agent.  Such  payment  shall be 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.

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

                  Unless the certificate of authentication  hereon has been duly
executed  by  the  Trustee   referred  to  on  the  reverse  hereof  or  by  the
authenticating  agent appointed as provided in the Indenture by manual signature
of an  authorized  signer,  this Note shall not be entitled to any benefit under
the Indenture, or be valid or obligatory for any purpose.



                                Page 120 of 162
<PAGE>





                  IN WITNESS WHEREOF,  the Company has caused this instrument to
be duly executed by the manual or facsimile signature of its authorized officers
and its corporate seal to be affixed or reproduced hereon.

                                            PSINET INC.


[Seal]                                      By:___________________________
                                            Title:________________________

Attest:


- ----------------------------
Authorized Officer





                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION



                  This  is one of the  10%  Senior  Notes  due  2005,  Series  A
referred to in the within-mentioned Indenture.

                            WILMINGTON TRUST COMPANY,
                                   as Trustee



                                          By:  _________________________________
                                                    Authorized Signer

Dated:




                                Page 121 of 162
<PAGE>





                       OPTION OF HOLDER TO ELECT PURCHASE



                  If you  wish  to  have  this  Note  purchased  by the  Company
pursuant to Section 10.12 or Section  10.14,  as  applicable,  of the Indenture,
check the Box: [_].

                  If you wish to have a portion  of this Note  purchased  by the
Company  pursuant  to  Section  10.12 or  Section  10.14 as  applicable,  of the
Indenture, state the amount (in original principal amount):

                           $ ---------------.


Date:  ___________________


                                          Your Signature:  _____________________


(Sign exactly as your name appears on the other side of this Note)


Signature Guarantee:  __________________________________




                                Page 122 of 162
<PAGE>





                                 (Back of Note)

                                   PSINET INC.
                       10% Senior Note due 2005, Series A

                  This  Note is one of a duly  authorized  issue of Notes of the
Company designated as its 10% Senior Notes due 2005, Series A (herein called the
"Notes"),  limited  (except as otherwise  provided in the Indenture  referred to
below) in aggregate principal amount to $600,000,000,  issued under, entitled to
the  benefits of and  subject to the terms of an  indenture  (herein  called the
"Indenture")  dated as of April 13,  1998,  between the  Company and  Wilmington
Trust Company,  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,  any Guarantors,  the Trustee and the Holders of the Notes,  and of
the terms upon which the Notes are, and are to be, authenticated and delivered.

                  The Indenture  contains  provisions for defeasance at any time
of (a)  the  entire  Indebtedness  on the  Notes  and  (b)  certain  restrictive
covenants  and  related  Defaults  and  Events  of  Default,  in each  case upon
compliance with certain conditions set forth therein.

                  The Notes are  subject to  redemption  at any time on or after
February 15, 2002,  at the option of the  Company,  in whole or in part,  on not
less than 30 nor more than 60 days'  prior  notice,  in  amounts of $1,000 or an
integral  multiple  thereof,  at the following  redemption  prices (expressed as
percentages of the principal  amount),  if redeemed  during the 12-month  period
beginning February 15 of the years indicated below:

                                                     Redemption
                        Year                            Pric
                        ----                         ----------
                        2002                           105.0%
                        2003                           102.5%
                        2004                           100.0%

and  thereafter at 100% of the  principal  amount,  in each case,  together with
accrued and unpaid  interest,  if any, to the  Redemption  Date  (subject to the
rights of Holders of record on relevant record dates to receive  interest due on
an Interest Payment Date).

                  In addition, at any time on or prior to February 15, 2001, the
Company may, at its option,  use the net  proceeds of one or more Public  Equity
Offerings or the sale of Capital  Stock (other than  Disqualified  Stock) of the
Company  to a  Strategic  Investor  in a single  transaction  or in a series  of
related  transactions,  to redeem  up to an  aggregate  of 35% of the  aggregate
principal amount of Notes originally  issued under the Indenture at a redemption
price equal to 110.0% of the aggregate  principal  amount thereof,  plus accrued
and unpaid interest  thereon,  if any, to the Redemption Date;  provided that at
least 65% aggregate  principal amount of Notes remains  outstanding  immediately
after  the  occurrence  of such  redemption.  In order to effect  the  foregoing
redemption,  the Company must mail a notice of  redemption no later than 45 days
after the  closing of the  related  Public  Equity  Offering  or to a  Strategic
Investor and must consummate  such  redemption  within 60 days of the closing of
the Public Equity Offering.

                                Page 123 of 162
<PAGE>


                  If less than all of the Notes are to be redeemed,  the Trustee
shall select the Notes or portions thereof to be redeemed pro rata, by lot or by
any other method the Trustee shall deem fair and reasonable.

                  Upon the  occurrence  of a Change of  Control,  subject to the
terms of the  Indenture,  each Holder may  require the Company to purchase  such
Holder's  Notes  in whole  or in part in  integral  multiples  of  $1,000,  at a
purchase  price  in cash in an  amount  equal  to 101% of the  principal  amount
thereof,  plus  accrued and unpaid  interest,  if any, to the date of  purchase,
pursuant to a Change of Control  Offer in  accordance  with the  procedures  set
forth in the Indenture.

                  Under  certain  circumstances,  in  the  event  the  Net  Cash
Proceeds  received by the Company  from any Asset Sale,  which  proceeds are not
used to repay any Pari  Passu  Indebtedness  of the  Company  or any  Subsidiary
(including   the   repurchase   of  Notes)  or  which   will  be   invested   in
Telecommunications  Assets,  exceeds a  specified  amount  the  Company  will be
required  to apply  such  proceeds  by  making an offer  purchase  the Notes and
certain Indebtedness ranking pari passu in right of payment to the Notes.

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

                  In the event of redemption of this Note in accordance with the
Indenture in part only, a new Note or Notes for the  unredeemed  portion  hereof
shall be issued in the name of the Holder hereof upon the cancellation hereof.

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

                  The  Indenture  permits,  with certain  exceptions  (including
certain  amendments  permitted  without  the  consent of any Holders and certain
amendments  which  require the consent of all the Holders) as therein  provided,
the amendment  thereof and the modification of the rights and obligations of the
Company and any Guarantors and the rights of the Holders under the Indenture and
the Notes and any Guarantees at any time by the Company and the Trustee with the
consent of the Holders of at least a majority in aggregate  principal  amount of
the  Notes at the time  Outstanding.  The  Indenture  also  contains  provisions
permitting the Holders of at least a majority in aggregate  principal  amount of
the  Notes  (100%  of  the  Holders  in  certain   circumstances)  at  the  time
Outstanding,  on behalf of the Holders of all the Notes, to waive  compliance by
the Company and any Guarantors with certain  provisions of the Indenture and the
Notes and any  Guarantees  and certain past Defaults under the Indenture and the
Notes and any Guarantees and their  consequences.  Any such consent or waiver by
or on behalf of the Holder of this Note shall be  conclusive  and  binding  upon
such Holder and upon all future Holders of this Note and of any Note 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 Note.

                  No reference  herein to the Indenture and no provision of this
Note or of the  Indenture  shall alter or impair the  obligation of the Company,
any Guarantor or any other obligor on the Notes (in the event such  Guarantor or
such other obligor is obligated to make payments in respect of the Notes), which
is absolute and  unconditional,  to pay the principal of,  premium,  if any, and
interest  on,  this  Note at the  times,  place,  and  rate,  and in the coin or
currency, herein prescribed.

                                Page 124 of 162
<PAGE>


                  As   provided  in  the   Indenture   and  subject  to  certain
limitations  therein set forth,  the transfer of this Note is registrable in the
Note Register,  upon surrender of this Note for  registration of transfer at the
office or agency of the  Company in the  Borough of  Manhattan,  The City of New
York,  duly endorsed by, or accompanied  by a written  instrument of transfer in
form  satisfactory  to the Company and the Note  Registrar duly executed by, the
Holder hereof or its attorney duly  authorized in writing,  and thereupon one or
more new Notes, of authorized denominations and for the same aggregate principal
amount, will be issued to the designated transferee or transferees.

                  Certificated securities shall be transferred to all beneficial
holders in exchange for their beneficial interests in the Rule 144A Global Notes
or the Regulation S Global Notes if (x) the Depositary notifies the Company that
it is unwilling or unable to continue as  depository  for such Global Note and a
successor depository is not appointed by the Company within 90 days or (y) there
shall have occurred and be continuing an Event of Default and the Note Registrar
has received a request from the Depositary.  Upon any such issuance, the Trustee
is  required to register  such  certificated  Series A Notes in the name of, and
cause the same to be delivered to, such Person or Persons (or the nominee of any
thereof).  All such certificated Series A Notes would be required to include the
Private Placement Legend.

                  Series  A Notes in  certificated  form  are  issuable  only in
registered  form  without  coupons in  denominations  of $1,000 and any integral
multiple  thereof.   As  provided  in  the  Indenture  and  subject  to  certain
limitations  therein set forth,  the Series A Notes are  exchangeable for a like
aggregate principal amount of Notes of a differing authorized  denomination,  as
requested by the Holder surrendering the same.

                  At any time when the  Company is not subject to Sections 13 or
15(d) of the Exchange  Act,  upon the written  request of a Holder of a Series A
Note,  the  Company  will  promptly  furnish  or  cause  to  be  furnished  such
information as is specified pursuant to Rule 144A(d)(4) under the Securities Act
(or  any  successor  provision  thereto)  to  such  Holder  or to a  prospective
purchaser  of such  Series  A Note  who  such  Holder  informs  the  Company  is
reasonably believed to be a "Qualified  Institutional  Buyer" within the meaning
of Rule 144A under the  Securities  Act,  as the case may be, in order to permit
compliance by such Holder with Rule 144A under the Securities Act.

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

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

                  THIS NOTE SHALL BE GOVERNED  BY AND  CONSTRUED  IN  ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK,  WITHOUT  REGARD  TO  CONFLICTS  OF LAWS
PRINCIPLES THEREOF.

                  All terms used in this Note which are defined in the Indenture
and not otherwise defined herein shall have the meanings assigned to them in the
Indenture.

 [The Transferee Certificate, in the form of Appendix I hereto, will be attached
to the Series A Note.]




                                Page 125 of 162




                                                                    Exhibit 10.1



                          REGISTRATION RIGHTS AGREEMENT


                           Dated as of April 13, 1998
                                  by and among

                                   PSINet Inc.


                                       and

                     Donaldson, Lufkin & Jenrette Securities
                        Corporation, Merrill Lynch & Co.,
                              Chase Securities Inc.




                                Page 126 of 162
<PAGE>






                  This Registration  Rights Agreement (this "Agreement") is made
and entered  into as of April 13,  1998,  by and among  PSINet  Inc., a New York
corporation  (the  "Company"),  and  Donaldson,  Lufkin  &  Jenrette  Securities
Corporation,  Merrill  Lynch,  Pierce,  Fenner & Smith  Incorporated  and  Chase
Securities  Inc. (each an "Initial  Purchaser" and,  collectively,  the "Initial
Purchasers"), each of whom has agreed to purchase the Company's 10% Senior Notes
due 2005 (the "Notes") pursuant to the Purchase Agreement (as defined below).

                  This  Agreement is made  pursuant to the  Purchase  Agreement,
dated April 13, 1998 (the  "Purchase  Agreement"),  by and among the Company and
the Initial  Purchasers.  In order to induce the Initial  Purchasers to purchase
the Notes, the Company has agreed to provide the  registration  rights set forth
in this  Agreement.  The execution and delivery of this Agreement is a condition
to the  obligations  of the  Initial  Purchasers  set forth in  Section 3 of the
Purchase  Agreement.  Capitalized  terms used herein and not  otherwise  defined
shall have the  meaning  assigned to them the  Indenture,  dated as of April 13,
1998, between the Company and Wilmington Trust Company, as Trustee,  relating to
the Notes and the Exchange Notes (as defined below) (the "Indenture").

                  The parties hereby agree as follows:

                                  ARTICLE XIV
                                   DEFINITIONS

                  As used in this  Agreement,  the following  capitalized  terms
shall have the following meanings:

                  Act:  The Securities Act of 1933, as amended.

                  Affiliate:  As defined in Rule 144 of the Commission under the
 Act.

                  Affiliated Market Maker:  A Broker-Dealer who is  deemed to be
an Affiliate of the Company.

                  Broker-Dealer:   Any  broker or dealer  registered  under  the
Exchange Act.

                  Business  Day: A day other than  Saturday,  Sunday or a day on
which banking institutions located in New York City or in the place in which the
Company  maintains  its  principal  office are  authorized  or obligated by law,
regulation or executive order to be closed.

                  Certificated Securities:  Physical  Notes,  as  defined in the
Indenture.

                  Closing Date:  The date hereof.

                  Commission:  The Securities and Exchange Commission.

                  Consummate:  An Exchange  Offer shall be deemed  "Consummated"
for  purposes  of this  Agreement  upon the  occurrence  of (a) the  filing  and
effectiveness  under  the  Act  of the  Exchange  Offer  Registration  Statement
relating  to the  Exchange  Notes to be issued in the  Exchange  Offer,  (b) the
maintenance of such Exchange Offer Registration Statement continuously effective
and the keeping of the Exchange Offer open for a period not less than the period
required  pursuant to Section 3(b) hereof and (c) the delivery by the Company to
the  Registrar  under the  Indenture  of  Exchange  Notes in the same  aggregate
principal amount as the aggregate  principal amount of Notes validly tendered by
Holders thereof  pursuant to the Exchange Offer. The term  "Consummation"  shall
have a correlative meaning.

                                Page 127 of 162
<PAGE>


                  Consummation Deadline:  As defined in Section 3(b) hereof.

                  Effectiveness Deadline:  As defined in Sections  3(a) and 4(a)
hereof.

                  Exchange Act: The Securities Exchange Act of 1934, as amended.

                  Exchange  Notes:  The  Company's  10%  Senior  Notes  due 2005
to be issued  pursuant to the  Indenture:  (i) in the Exchange  Offer or (ii) as
contemplated by Section 4 hereof.

                  Exchange Offer: The exchange and issuance by the Company of an
aggregate principal amount of Exchange Notes (which shall be registered pursuant
to the Exchange Offer Registration Statement) equal to the outstanding aggregate
principal  amount of Notes that are tendered by such Holders in connection  with
such exchange and issuance.

                  Exchange  Offer  Registration  Statement:   The   Registration
Statement relating to the Exchange Offer, including the related Prospectus.

                  Exempt  Resales:   The   transactions  in  which  the  Initial
Purchasers  propose  to resell  the Notes to  certain  "qualified  institutional
buyers,"  as such term is  defined in Rule 144A  under the Act and  pursuant  to
Regulation S under the Act.

                  Filing Deadline:  As defined in Sections 3(a) and 4(a) hereof.

                  Holders:  As defined in Section 2 hereof.

                  Person:   Any  individual,   corporation,   limited  liability
company, partnership,  joint venture,  association,  joint-stock company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.

                  Prospectus:   The   prospectus   included  in  a  Registration
Statement  at the time such  Registration  Statement is declared  effective,  as
amended or supplemented by any prospectus supplement and by all other amendments
thereto,  including post-effective  amendments, and all material incorporated by
reference into such Offering Memorandum.

                  Recommencement Date: As defined in Section 6(d) hereof.

                  Registration Default:  As defined in Section 5 hereof.

                  Registration  Statement:  Any  registration  statement  of the
Company  relating to (a) an offering of Exchange  Notes pursuant to the Exchange
Offer or (b) the  registration  for  resale of  Transfer  Restricted  Securities
pursuant to the Shelf  Registration  Statement,  in each case, (i) that is filed
pursuant to the  provisions of this  Agreement and (ii) including the Prospectus
included   therein,   all  amendments   and   supplements   thereto   (including
post-effective  amendments)  and  all  exhibits  and  material  incorporated  by
reference therein.

                  Regulation S: Regulation S promulgated under the Act.

                  Shelf Registration Statement:  As defined in Section 4 hereof.

                  Suspension Notice:  As defined in Section 6(d) hereof.


                                Page 128 of 162
<PAGE>


                  TIA:     The Trust  Indenture  Act of 1939 (15 U.S.C.  Section
77aaa-77bbbb) as in effect on the date of the Indenture.

                  Transfer Restricted Securities:  Each Note, until the earliest
to occur of (a) the date on which such Note is exchanged  in the Exchange  Offer
for a Exchange  Note which is  entitled to be resold to the public by the Holder
thereof without complying with the prospectus delivery  requirements of the Act,
(b) the date on which such Note has been disposed of in accordance  with a Shelf
Registration  Statement  (and the purchasers  thereof have been issued  Exchange
Notes),  or (c) the date on which such Note is entitled to be distributed to the
public  pursuant  to Rule 144 under the Act (and  purchasers  thereof  have been
issued  Exchange  Notes),  and each  Exchange  Note until the date on which such
Exchange  Note is  disposed  of by a  Broker-Dealer  pursuant  to the  "Plan  of
Distribution"   contemplated  by  the  Exchange  Offer  Registration   Statement
(including the delivery of the Prospectus contained therein).

                                   ARTICLE XV
                                     HOLDERS

                  A Person  is  deemed  to be a holder  of  Transfer  Restricted
Securities  (each,  a "Holder")  whenever such Person owns  Transfer  Restricted
Securities.

                                  ARTICLE XVI
                            REGISTERED EXCHANGE OFFER


          (a) Unless the Exchange  Offer shall not be  permitted  by  applicable
federal law (after the procedures  set forth in Section  6(a)(i) below have been
complied  with),  the Company  shall (i) cause the Exchange  Offer  Registration
Statement  to be filed  with the  Commission  as soon as  practicable  after the
Closing  Date,  but in no event later than 45 days after the Closing  Date (such
45th day being the "Filing  Deadline"),  (ii) use its best efforts to cause such
Exchange  Offer  Registration  Statement  to become  effective  at the  earliest
possible time (consistent with existing contractual obligations of the Company),
but in no event later than 150 days after the Closing Date (such 150th day being
the "Effectiveness Deadline"),  (iii) in connection with the foregoing, (A) file
all pre-effective  amendments to such Exchange Offer  Registration  Statement as
may be  necessary  in order  to  cause it to  become  effective,  (B)  file,  if
applicable,  a  post-effective  amendment to such  Exchange  Offer  Registration
Statement  pursuant  to Rule 430A  under  the Act and (C)  cause  all  necessary
filings,  if any, in connection with the registration  and  qualification of the
Exchange Notes to be made under the Blue Sky laws of such  jurisdictions  as are
necessary  to  permit  Consummation  of the  Exchange  Offer,  and (iv) upon the
effectiveness  of such  Exchange  Offer  Registration  Statement,  commence  and
Consummate the Exchange  Offer.  The Exchange Offer shall be on the  appropriate
form permitting (i) registration of the Exchange Notes to be offered in exchange
for the Notes  that are  Transfer  Restricted  Securities  and (ii)  resales  of
Exchange Notes by Broker-Dealers that tendered into the Exchange Offer the Notes
that  such  Broker-Dealer  acquired  for its own  account  as a result of market
making  activities  or other  trading  activities  (other  than  Notes  acquired
directly from the Company or any of its  Affiliates) as  contemplated by Section
3(c) below.

          (b) The Company shall use its best efforts to cause the Exchange Offer
Registration  Statement to be effective continuously and shall keep the Exchange
Offer  open for a period  of not less than the  minimum  period  required  under
applicable  federal and state  securities laws to Consummate the Exchange Offer;
provided,  however,  that in no event shall such period be less than 20 Business
Days.  The Company shall cause the Exchange  Offer to comply with all applicable
federal and state  securities  laws. No securities other than the Exchange Notes
shall be included in the  Exchange  Offer  Registration  Statement.  The Company
shall use its best efforts to cause the Exchange  Offer to be Consummated on 



                                Page 129 of 162
<PAGE>

the earliest  practicable date after the Exchange Offer  Registration  Statement
has become  effective,  but in no event later than 30 Business  Days  thereafter
(such 30th day being the "Consummation Deadline").

          (c) The Company shall include a "Plan of Distribution"  section in the
Prospectus  contained in the Exchange Offer Registration  Statement and indicate
therein that any  Broker-Dealer  who holds Transfer  Restricted  Securities that
were acquired for the account of such Broker-Dealer as a result of market-making
activities or other trading  activities (other than Notes acquired directly from
the  Company or any  Affiliate  of the  Company),  may  exchange  such  Transfer
Restricted   Securities   pursuant  to  the  Exchange   Offer;   however,   such
Broker-Dealer may be deemed to be an "underwriter" within the meaning of the Act
and must, therefore, deliver a prospectus meeting the requirements of the Act in
connection with any resales of the Exchange Notes received by such Broker-Dealer
in the Exchange Offer, which prospectus delivery requirement may be satisfied by
the delivery by such  Broker-Dealer of the Prospectus  contained in the Exchange
Offer  Registration  Statement.  Such "Plan of Distribution"  section shall also
contain all other information with respect to such sales by such  Broker-Dealers
that the Commission may require in order to permit such sales pursuant  thereto,
but such  "Plan of  Distribution"  shall  not  name  any such  Broker-Dealer  or
disclose  the  amount  of  Transfer  Restricted  Securities  held  by  any  such
Broker-Dealer,  except to the extent required by the Commission as a result of a
change in policy,  rules or regulations  after the date of this  Agreement.  The
letter of  transmittal  or similar  documentation  to be executed by a Holder in
order to participate in the Exchange Offer will include,  among other things,  a
provision to the effect that,  if the Holder is a  Broker-Dealer  holding  Notes
acquired for its own account as a result of  market-making  activities  or other
trading  activities,  such Holder acknowledges that it will deliver a prospectus
meeting the  requirements  of the Act in connection  with any resale of Exchange
Notes received in respect of Notes pursuant to the Exchange Offer.  

          Because such Broker-Dealer may be deemed to be an "underwriter" within
the meaning of the Act and must,  therefore,  deliver a  prospectus  meeting the
requirements  of the Act in  connection  with its initial  sale of any  Exchange
Notes received by such  Broker-Dealer  in the Exchange Offer,  the Company shall
permit the use of the Prospectus  contained in the Exchange  Offer  Registration
Statement by such Broker-Dealer to satisfy such prospectus delivery requirement.
To the extent necessary to ensure that the prospectus  contained in the Exchange
Offer  Registration  Statement  is  available  for  sales of  Exchange  Notes by
Broker-Dealers,  the Company  agree to use its best efforts to keep the Exchange
Offer Registration Statement continuously effective,  supplemented,  amended and
current as  required by and subject to the  provisions  of Section  6(a) and (c)
hereof and in conformity with the  requirements  of this Agreement,  the Act and
the policies,  rules and regulations of the Commission as announced from time to
time,  for a period of one year from the  Consummation  Deadline or such shorter
period as will terminate when all Transfer Restricted Securities covered by such
Registration  Statement  have been sold  pursuant  thereto.  The  Company  shall
provide  sufficient  copies of the  latest  version of such  Prospectus  to such
Broker-Dealers,  promptly upon request,  and in no event later than two Business
Days after such request, at any time during such period.

                                  ARTICLE XVII
                               SHELF REGISTRATION


          (a) Shelf Registration.  If (i) the Exchange Offer is not permitted by
applicable  law (after the Company has complied with the procedures set forth in
Section 6(a)(i) below) or (ii) if any Holder of Transfer  Restricted  Securities
shall notify the Company  within 20 Business  Days  following  the  Consummation
Deadline that (A) such Holder was  prohibited  by law or Commission  policy from
participating  in the  Exchange  Offer or (B) such  Holder  may not  resell  the
Exchange  Notes  acquired  by it in the  Exchange  Offer to the  public  without
delivering  a prospectus  and the  Prospectus  contained  in the Exchange  Offer
Registration  Statement is not appropriate or available for such resales by such
Holder or 



                                Page 130 of 162
<PAGE>

(C) such Holder is a  Broker-Dealer  and holds Notes acquired  directly from the
Company or any of its Affiliates, then the Company shall: (

               x) cause to be filed, on or prior to 30 days after the earlier of
          (i) the date on which the Company  determines  that the Exchange Offer
          Registration  Statement  cannot be filed as a result of clause  (a)(i)
          above or (ii)  the  date on which  the  Company  receives  the  notice
          specified in clause  (a)(ii)  above (such  earlier  date,  the "Filing
          Deadline"),  a shelf registration statement pursuant to Rule 415 under
          the Act (which may be an amendment to the Exchange Offer  Registration
          statement  (the  "Shelf  Registration  Statement")),  relating  to all
          Transfer  Restricted  Securities,  the  Holders  of which  shall  have
          provided the information required pursuant to Section 4(b) hereof, and
          
               (y) shall use its best  efforts to cause such Shelf  Registration
          Statement to become  effective on or prior to 60 days after the filing
          of the Shelf  Registration  Statement (or such longer  period,  not to
          exceed 150 days after the filing of the Shelf  Registration  Statement
          as may be  necessary  to avoid  conflicts  with  existing  contractual
          obligations  of the  Company)  (such  60th day or  longer  period  the
          "Effectiveness Deadline").

          If,  after  the  Company  has  filed an  Exchange  Offer  Registration
Statement that satisfies the  requirements of Section 3(a) above, the Company is
required  to file and  make  effective  a Shelf  Registration  Statement  solely
because the Exchange Offer is not permitted under applicable  federal law (i.e.,
clause  (a)(i)  above),  then the  filing  of the  Exchange  Offer  Registration
Statement  shall be deemed to  satisfy  the  requirements  of clause  (x) above;
provided  that, in such event,  the Company  shall remain  obligated to meet the
Effectiveness Deadline set forth in clause (y) above.

          To  the  extent  necessary  to  ensure  that  the  Shelf  Registration
Statement  is  available  for sales of  Transfer  Restricted  Securities  by the
Holders  thereof  entitled  to the  benefit of this  Section  4(a) and the other
securities  required  to be  registered  therein  pursuant  to Section  6(b)(ii)
hereof,  the Company  shall use its best efforts to keep any Shelf  Registration
Statement  required by this Section 4(a) continuously  effective,  supplemented,
amended and current as  required  by and subject to the  provisions  of Sections
6(b) and (c) hereof and in conformity  with the  requirements of this Agreement,
the Act and the policies,  rules and  regulations of the Commission as announced
from time to time,  for a period of at least two years (as extended  pursuant to
Section  6(c)(i))  following the Closing  Date,  or such shorter  period as will
terminate  when  all  Transfer  Restricted  Securities  covered  by  such  Shelf
Registration Statement have been sold pursuant thereto.


          (b) Provision by Holders of Certain Information in Connection with the
Shelf Registration  Statement.  No Holder of Transfer Restricted  Securities may
include any of its  Transfer  Restricted  Securities  in any Shelf  Registration
Statement  pursuant to this Agreement  unless and until such Holder furnishes to
the  Company in  writing,  within 10  Business  days after  receipt of a request
therefor,  such  information  as the Company may  reasonably  request for use in
connection  with any Shelf  Registration  Statement or Prospectus or preliminary
prospectus  included therein,  including,  without  limitation,  the information
specified in Item 507 or 508 of Regulation S-K, as applicable, under the Act for
use in  connection  with any  Shelf  Registration  Statement  or  Prospectus  or
preliminary  Prospectus  included  therein.  No  Holder of  Transfer  Restricted
Securities shall be entitled to liquidated  damages pursuant to Section 5 hereof
unless and until such Holder  shall have  provided  all such  information.  Each
selling  Holder as to which any Shelf  Registration  Statement is being effected
agrees to notify the Company as promptly as  practicable  of any  inaccuracy  or
change in information  previously furnished by such Holder to the Company or the
happening  of any  event,  in  either  case  as a  result  of  which  the  Shelf
Registration  Statement  contains  any  untrue  statement  of  a  material  fact
regarding such Holder or the distribution of 



                                Page 131 of 162
<PAGE>

Transfer  Restricted  Securities or omits to state any material  fact  regarding
such Holder or the distribution of such Transfer Restricted  Securities required
to be stated therein or necessary to make the statement therein, in light of the
circumstances  under  which  they are made,  not  misleading  or any  prospectus
relating to such Shelf Registration Statement contains any untrue statement of a
material  fact  regarding  such  Holder  or the  distribution  of such  Transfer
Restricted  Securities or omits to state any material fact regarding such Holder
or the distribution of such Transfer Restricted Securities necessary to make the
statements  therein,  in light of the circumstances  under which they were made,
not  misleading,   and  to  furnish  promptly  to  the  Company  any  additional
information  (i)  required  to  correct  and  update  any  previously  furnished
information  or (ii)  required so that the Shelf  Registration  Statement or any
Prospectus shall not contain any such untrue statement of a material fact or any
such omission to state a material fact.

                                  ARTICLE XVIII
                               LIQUIDATED DAMAGES

          If (i) any  Registration  Statement  required by this Agreement is not
filed with the Commission on or prior to the applicable  Filing  Deadline,  (ii)
any  such  Registration  Statement  has  not  been  declared  effective  by  the
Commission  on or prior to the  applicable  Effectiveness  Deadline,  (iii)  the
Exchange  Offer  has  not  been  Consummated  on or  prior  to the  Consummation
Deadline, or (iv) any Registration Statement required by this Agreement is filed
and declared  effective but shall thereafter cease to be effective or fail to be
usable for its intended purpose without being succeeded  immediately (subject to
the terms of this Agreement) by a post-effective  amendment to such Registration
Statement  that  cures  such  failure  and  that is  itself  declared  effective
immediately  (each such  event  referred  to in  clauses  (i)  through  (iv),  a
"Registration Default"), then the Company hereby agrees to pay to each Holder of
Transfer Restricted  Securities affected thereby liquidated damages in an amount
equal to $.05 per week per $1,000 in  principal  amount of  Transfer  Restricted
Securities  held by such  Holder  for  each  week or  portion  thereof  that the
Registration Default continues for the first 90-day period immediately following
the  occurrence  of such  Registration  Default.  The  amount of the  liquidated
damages shall  increase by an  additional  $.05 per week per $1,000 in principal
amount of Transfer Restricted  Securities with respect to each subsequent 90-day
period until all  Registration  Defaults have been cured, up to a maximum amount
of  liquidated  damages  of $.50 per week per  $1,000  in  principal  amount  of
Transfer Restricted  Securities,  provided that the Company shall in no event be
required to pay liquidated damages for more than one Registration Default at any
given time.  Notwithstanding anything to the contrary set forth herein, (1) upon
filing of the Exchange Offer Registration Statement (and/or, if applicable,  the
Shelf  Registration  Statement),  in  the  case  of  (i)  above,  (2)  upon  the
effectiveness  of  the  Exchange  Offer  Registration   Statement  (and/or,   if
applicable,  the Shelf Registration  Statement),  in the case of (ii) above, (3)
upon Consummation of the Exchange Offer, in the case of (iii) above, or (4) upon
the filing of a  post-effective  amendment to the  Registration  Statement or an
additional  Registration  Statement that causes the Exchange Offer  Registration
Statement (and/or, if applicable,  the Shelf Registration Statement) to again be
declared  effective  or made  usable in the case of (iv) above,  the  liquidated
damages payable with respect to the Transfer  Restricted  Securities as a result
of such clause (i), (ii), (iii) or (iv), as applicable, shall cease.

          All accrued  liquidated  damages shall be paid to the Holders entitled
thereto, in the manner provided for the payment of interest in the Indenture, on
each  Interest  Payment  Date,  as more fully set forth in the Indenture and the
Notes. Notwithstanding the fact that any securities for which liquidated damages
are due cease to be  Transfer  Restricted  Securities,  all  obligations  of the
Company to pay liquidated  damages with respect to such  securities  outstanding
prior to the time such securities  ceased to be Transfer  Restricted  Securities
shall  survive  until  such  time  as  such  obligations  with  respect  to such
securities shall have been satisfied in full.

                                Page 132 of 162
<PAGE>


                                  ARTICLE XIX
                             REGISTRATION PROCEDURES


          (a) Exchange  Offer  Registration  Statement.  In connection  with the
Exchange Offer,  the Company shall (x) comply with all applicable  provisions of
Section  6(c) below,  (y) use its best  efforts to effect such  exchange  and to
permit the resale of  Exchange  Notes by  Broker-Dealers  that  tendered  in the
Exchange Offer Notes that such  Broker-Dealer  acquired for its own account as a
result of its market making  activities or other trading  activities (other than
Notes acquired directly from the Company or any of its Affiliates) being sold in
accordance with the intended method or methods of distribution  thereof, and (z)
comply with all of the following provisions:

          (i) If, following the date hereof there has been announced a change in
          Commission policy with respect to exchange offers such as the Exchange
          Offer, that in the reasonable opinion of counsel to the Company raises
          a substantial  question as to whether the Exchange  Offer is permitted
          by  applicable  federal  law,  the  Company  hereby  agrees  to seek a
          no-action  letter  or other  favorable  decision  from the  Commission
          allowing the Company to Consummate an Exchange Offer for such Transfer
          Restricted  Securities.  The  Company  hereby  agrees  to  pursue  the
          issuance  of  such  a  decision  to the  Commission  staff  level.  In
          connection  with and  subject to the  foregoing,  the  Company  hereby
          agrees to take all such other actions as may be  reasonably  requested
          by the  Commission  or  otherwise  required  in  connection  with  the
          issuance  of  such  decision,   including,   without  limitation,  (A)
          participating  in  telephonic  conferences  with the  Commission,  (B)
          delivering to the Commission staff an analysis  prepared by counsel to
          the Company  setting  forth the legal bases,  if any,  upon which such
          counsel has concluded  that such an Exchange Offer should be permitted
          and (C) diligently pursuing a resolution (which need not be favorable)
          by the Commission  staff.  

          (ii) As a condition to its  participation in the Exchange Offer,  each
          Holder  of  Transfer   Restricted   Securities   (including,   without
          limitation, any Holder who is a Broker Dealer) shall furnish, upon the
          request of the  Company,  prior to the  Consummation  of the  Exchange
          Offer, a written representation to the Company (which may be contained
          in the  letter  of  transmittal  contemplated  by the  Exchange  Offer
          Registration  Statement) to the effect that (A) it is not an Affiliate
          of the  Company,  (B) it is not  engaged  in,  and does not  intend to
          engage in, and has no arrangement or understanding  with any person to
          participate  in, a distribution  of the Exchange Notes to be issued in
          the Exchange  Offer and (C) it is acquiring the Exchange  Notes in its
          ordinary course of business. In addition, all such Holders of Transfer
          Restricted  Securities  shall  otherwise  reasonably  cooperate to the
          extent necessary in the Company's preparations for the Exchange Offer.
          Each Holder using the Exchange  Offer to participate in a distribution
          of the Exchange  Notes  hereby  acknowledges  and agrees that,  if the
          resales  are of  Exchange  Notes  obtained  by such Holder in exchange
          Notes acquired directly from the Company or an Affiliate  thereof,  it
          (1) could  not,  under  Commission  policy as in effect on the date of
          this Agreement,  rely on the position of the Commission  enunciated in
          Morgan  Stanley  and Co.,  Inc.  (available  June 5,  1991)  and Exxon
          Capital Holdings Corporation  (available May 13, 1988), as interpreted
          in the Commission's  letter to Shearman & Sterling dated July 2, 1993,
          and similar no-action letters (including, if applicable, any no-action
          letter  obtained  pursuant to clause (i)  above),  and (2) must comply
          with the registration and prospectus delivery  requirements of the Act
          in  connection  with a secondary  resale  transaction  and that such a
          secondary   resale   transaction  must  be  covered  by  an  effective
          registration   statement   containing  the  selling   security  holder
          information required by Item 507 or 508, as applicable,  of Regulation
          S-K. 

                                Page 133 of 162
<PAGE>


          (iii)  Prior  to  effectiveness  of the  Exchange  Offer  Registration
          Statement,  the Company  shall  provide a  supplemental  letter to the
          Commission  (A) stating that the Company is  registering  the Exchange
          Offer in reliance  on the  position of the  Commission  enunciated  in
          Exxon Capital Holdings  Corporation  (available May 13, 1988),  Morgan
          Stanley and Co., Inc.  (available  June 5, 1991) as interpreted in the
          Commission's letter to Shearman & Sterling dated July 2, 1993, and, if
          applicable,  any  no-action  letter  obtained  pursuant  to clause (i)
          above, (B) including a representation that the Company has not entered
          into any  arrangement or  understanding  with any Person to distribute
          the Exchange  Notes to be received in the Exchange  Offer,  and to the
          extent that the Company is capable of so representing,  to the best of
          the Company's information and belief, each Holder participating in the
          Exchange Offer is acquiring the Exchange Notes in its ordinary  course
          of business and has no arrangement or understanding with any Person to
          participate in the  distribution of the Exchange Notes received in the
          Exchange  Offer  and  (C)  any  other  undertaking  or  representation
          required  by the  Commission  as set  forth  in any  no-action  letter
          obtained pursuant to clause (i) above, if applicable.

          (b)  Shelf  Registration  Statement.  In  connection  with  the  Shelf
Registration Statement, the Company shall (i) (x) comply with all the provisions
of Section 6(c) below and (y) use its best  efforts to effect such  registration
to  permit  the  sale  of the  Transfer  Restricted  Securities  being  sold  in
accordance  with the  intended  method or methods of  distribution  thereof  (as
indicated in the information  furnished to the Company  pursuant to Section 4(b)
hereof),  and  pursuant  thereto  the  Company  will  prepare  and file with the
Commission  a  Registration  Statement  relating  to  the  registration  on  any
appropriate  form under the Act,  which form shall be available  for the sale of
the Transfer  Restricted  Securities in accordance  with the intended  method or
methods  of  distribution  thereof  within the time  periods  and  otherwise  in
accordance with the provisions  hereof;  and (ii) issue, upon the request of any
Holder  or  purchaser  of Notes  covered  by any  Shelf  Registration  Statement
contemplated  by this  Agreement,  Exchange Notes having an aggregate  principal
amount equal to the  aggregate  principal  amount of Notes sold  pursuant to the
Shelf  Registration  Statement and surrendered to the Company for  cancellation;
the Company shall register  Exchange Notes on the Shelf  Registration  Statement
for this purpose and issue the Exchange Notes to the  purchaser(s) of securities
subject to the Shelf  Registration  Statement in the names as such  purchaser(s)
shall  designate.  

          (c) General Provisions.  In connection with any Registration Statement
and any related Prospectus required by this Agreement, the Company shall:

          (i)  use  its  best  efforts  to  keep  such  Registration   Statement
          continuously  effective and provide all requisite financial statements
          for the  period  specified  in  Section 3 or 4 of this  Agreement,  as
          applicable. Upon the occurrence of any event that would cause any such
          Registration  Statement  or the  Prospectus  contained  therein (A) to
          contain  an untrue  statement  of  material  fact or omit to state any
          material fact necessary to make the statements  therein not misleading
          or  (B)  not  to be  effective  and  usable  for  resale  of  Transfer
          Restricted  Securities  during the period  required by this Agreement,
          the Company  shall file  promptly  an  appropriate  amendment  to such
          Registration  Statement curing such defect,  and, if Commission review
          is  required,  use its best  efforts  to cause  such  amendment  to be
          declared effective as soon as practicable.  

          (ii)  prepare  and  file  with  the  Commission  such  amendments  and
          post-effective  amendments to the applicable Registration Statement as
          may be necessary to keep such Registration Statement effective for the
          applicable  period set forth in Section 3 or 4 hereof, as the case may
          be; cause the Prospectus to be supplemented by any required Prospectus


                                Page 134 of 162
<PAGE>

          supplement,  and as so  supplemented  to be filed pursuant to Rule 424
          under the Act, and to comply fully with the  applicable  provisions of
          Rules  424,  430A and 462,  as  applicable,  under the Act in a timely
          manner;  and comply with the provisions of the Act with respect to the
          disposition of all securities  covered by such Registration  Statement
          during the applicable period in accordance with the intended method or
          methods  of  distribution  by the  sellers  thereof  set forth in such
          Registration  Statement or supplement to the Prospectus; 

          (iii) advise each Holder and each Initial Purchaser who is required to
          deliver  a  prospectus  in  connection  with  sales or  market  making
          activities (an "Affiliated  Market Maker")  promptly and, if requested
          by such Holder or Person, confirm such advice in writing, (A) when the
          Prospectus or any Prospectus  supplement or  post-effective  amendment
          has been  filed,  and,  with  respect to any  applicable  Registration
          Statement or any post-effective  amendment thereto,  when the same has
          become effective,  (B) of any request by the Commission for amendments
          to the  Registration  Statement or  amendments or  supplements  to the
          Prospectus or for additional  information relating thereto, (C) of the
          issuance  by  the   Commission  of  any  stop  order   suspending  the
          effectiveness  of the  Registration  Statement under the Act or of the
          suspension by any state securities  commission of the qualification of
          the  Transfer  Restricted  Securities  for  offering  or  sale  in any
          jurisdiction,  or the  initiation  of any  proceeding  for  any of the
          preceding purposes,  (D) of the existence of any fact or the happening
          of any event that makes any  statement of a material  fact made in the
          Registration  Statement,  the Prospectus,  any amendment or supplement
          thereto or any document  incorporated by reference  therein untrue, or
          that  requires  the  making  of any  additions  to or  changes  in the
          Registration  Statement  in order to make the  statements  therein not
          misleading, or that requires the making of any additions to or changes
          in the  Prospectus  in order to make the  statements  therein,  in the
          light of the circumstances under which they were made, not misleading.
          If at any time the  Commission  shall issue any stop order  suspending
          the  effectiveness  of  the  Registration   Statement,  or  any  state
          securities  commission or other  regulatory  authority  shall issue an
          order suspending the qualification or exemption from  qualification of
          the Transfer Restricted  Securities under state securities or Blue Sky
          laws,  the Company shall use its best efforts to obtain the withdrawal
          or lifting of such order at the earliest  practical time; 

          (iv) subject to Section 6(c)(i),  if any fact or event contemplated by
          Section  6(c)(iii)(D)  above shall exist or have  occurred,  prepare a
          supplement or post-effective  amendment to the Registration  Statement
          or  related  Prospectus  or  any  document   incorporated  therein  by
          reference or file any other  required  document so that, as thereafter
          delivered to the  purchasers of Transfer  Restricted  Securities,  the
          Prospectus will not contain 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;  

          (v)  furnish  to each  Holder  and  each  Affiliated  Market  Maker in
          connection  with such exchange or sale, if any, before filing with the
          Commission,  copies of any  Registration  Statement or any  Prospectus
          included  therein  or  any  amendments  or  supplements  to  any  such
          Registration   Statement  or  Prospectus   (including   all  documents
          incorporated   by   reference   after  the  initial   filing  of  such
          Registration Statement), which documents will be subject to the review
          and comment of such Holders in connection  with such sale, if any, for
          a period of at least five Business Days, and the Company will not file
          any such  Registration  Statement or  Prospectus  or any  amendment or
          supplement to any such Registration Statement or Prospectus (including
          all such  documents  incorporated  by reference) to which 



                                Page 135 of 162
<PAGE>

          such Holders shall  reasonably  object within five Business Days after
          the  receipt  thereof.  A Holder  shall be deemed  to have  reasonably
          objected to such  filing if such  Registration  Statement,  amendment,
          Prospectus  or  supplement,  as  applicable,  as proposed to be filed,
          contains an untrue  statement of a material fact or omits to state any
          material fact necessary to make the statements  therein not misleading
          or fails to comply with the applicable  requirements  of the Act which
          has been  specifically  identified by such Holder or Affiliated Market
          Maker; (vi) promptly prior to the filing of any document that is to be
          incorporated by reference into a Registration Statement or Prospectus,
          provide  copies of such  document to each  Holder and each  Affiliated
          Market Maker in  connection  with such  exchange or sale, if any, make
          the  Company's  representatives  available  at  reasonable  times  for
          discussion of such document and other customary due diligence matters,
          and include  such  information  in such  document  prior to the filing
          thereof as such Holders may reasonably request;  

          (vii) make  available,  at reasonable  times,  for  inspection by each
          Holder and each Affiliated Market Maker and any attorney or accountant
          retained by such Holders all  financial and other  records,  pertinent
          corporate  documents of the Company and cause the Company's  officers,
          directors and employees to supply all information reasonably requested
          by any such Holder or attorney or accountant  in connection  with such
          Registration   Statement  or  any  post-effective   amendment  thereto
          subsequent  to the  filing  thereof  and  prior to its  effectiveness;
          provided, however, that such Persons shall first agree in writing with
          the Company that any information  that is reasonably and in good faith
          designated  by the Company in writing as  confidential  at the time of
          delivery  of  such  information  shall  be kept  confidential  by such
          Persons,  unless (i)  disclosure  of such  information  is required by
          court or administrative  order or is necessary to respond to inquiries
          of regulatory  authorities,  (ii)  disclosure of such  information  is
          required by law  (including any  disclosure  requirements  pursuant to
          federal  securities  laws  in  connection  with  the  filing  of  such
          Registration  Statement  or the  use of any  Prospectus),  (iii)  such
          information  becomes generally available to the public other than as a
          result of a disclosure  or failure to safeguard  such  information  by
          such Person or (iv) such information  becomes available to such Person
          from a source  other than the  Company and its  subsidiaries  and such
          source is not known, after due inquiry,  by such Person to be bound by
          a  confidentiality  agreement;  provided  further,  that the foregoing
          investigation  shall be  coordinated  on behalf of such Persons by one
          representative  designated  by and on behalf of such  Persons  and any
          such   confidential   information   shall  be   available   from  such
          representative  to such  Persons  so long as any  Person  agrees to be
          bound by such  confidentiality  agreement;  

          (viii) if requested by any Holders in connection with such exchange or
          sale  or  any  Affiliated  Market  Maker,   promptly  include  in  any
          Registration  Statement or  Prospectus,  pursuant to a  supplement  or
          post-effective  amendment  if  necessary,  such  information  as  such
          Holders may reasonably  request to have included  therein,  including,
          without limitation, information relating to the "Plan of Distribution"
          of the Transfer Restricted  Securities and the use of the Registration
          Statement or Prospectus  for market making  activities,  except to the
          extent  that the  Company,  upon  receipt of an  opinion  of  counsel,
          reasonably  believes  that the  inclusion  of such  information  could
          result in a violation of federal or state  securities  laws;  and make
          all required filings of such Prospectus  supplement or  post-effective
          amendment as soon as practicable  after the Company is notified of the
          matters to be included in such Prospectus supplement or post-effective
          amendment;  



                                Page 136 of 162
<PAGE>

          (ix) furnish to each Holder in  connection  with such exchange or sale
          and each Affiliated Market Maker, without charge, at least one copy of
          the Registration Statement, as first filed with the Commission, and of
          each  amendment  thereto,  including  all  documents  incorporated  by
          reference therein and all exhibits  (including  exhibits  incorporated
          therein by reference);  

          (x) deliver to each Holder and each Affiliated  Market Maker,  without
          charge,  as many copies of the Prospectus  (including each preliminary
          prospectus)  and any amendment or  supplement  thereto as such Persons
          reasonably  may request;  the Company  hereby  consents to the use (in
          accordance with law) of the Prospectus and any amendment or supplement
          thereto by each selling Holder in connection with the offering and the
          sale of the Transfer  Restricted  Securities covered by the Prospectus
          or  any  amendment  or  supplement   thereto  and  all  market  making
          activities of such  Affiliated  Market Maker, as the case may be; 

          (xi) upon the  request  of any  Holder,  enter  into  such  agreements
          (including underwriting  agreements) and make such representations and
          warranties  as are  customarily  made by  issuers to  underwriters  in
          primary  underwritten  offerings  and take all such  other  actions in
          connection   therewith  in  order  to  expedite  or   facilitate   the
          disposition  of the  Transfer  Restricted  Securities  pursuant to any
          applicable  Registration  Statement  contemplated by this Agreement as
          may be reasonably  requested by any Holder in connection with any sale
          or resale pursuant to any applicable  Registration  Statement. In such
          connection,  and also in connection  with market making  activities by
          any Affiliated Market Maker, the Company shall:

upon  request of any Holder  furnish (or in the case of  paragraphs  (2) and (3)
below,  use its best  efforts  to cause to be  furnished)  to each  Holder  upon
Consummation  of the  Exchange  Offer or upon  the  effectiveness  of the  Shelf
Registration  Statement, in such substance and scope and as are customarily made
by issuers to underwriters in primary  underwritten  offerings,  as the case may
be:  

          Section 19.02. a certificate, dated such date, signed on behalf of the
Company by (x) the President or any Vice President and (y) a principal financial
or accounting officer of the Company,  confirming,  as of the date thereof,  the
matters set forth in Sections 6(y), 9(a) and 9(b) of the Purchase  Agreement and
such other similar matters as such Holders may reasonably request;

          Section  19.03.  an  opinion,  dated the date of  Consummation  of the
Exchange Offer or the date of effectiveness of the Shelf Registration Statement,
as the case may be, of counsel for the Company covering matters similar to those
set forth in paragraph (e) of Section 9 of the Purchase Agreement and such other
matters as such  Holder may  reasonably  request,  and in any event  including a
statement to the effect that such counsel has  participated in conferences  with
officers  and  other  representatives  of the  Company,  representatives  of the
independent   public   accountants   for   the   Company,    the   underwriters'
representatives and the underwriters' counsel in connection with the preparation
of such Registration  Statement and the related Prospectus,  and have considered
the matters required to be stated therein and the statements  contained therein,
although such counsel has not independently verified the accuracy,  completeness
or fairness of such statements; and that such counsel advises that, on the basis
of the  foregoing  (relying as to  materiality  to the extent such counsel deems
appropriate  upon the  statements of officers and other  representatives  of the
Company and without  independent check or  verification),  no facts came to such
counsel's  attention  that caused such  counsel to believe  that the  applicable
Registration   Statement,  at  the  time  such  Registration  Statement  or  any
post-effective  amendment  thereto  became  effective  and,  in the  case of the
Exchange Offer  Registration  Statement,  as of the date of  Consummation of the
Exchange Offer,  contained an untrue  statement of a material fact or omitted to
state a material  fact  required to be stated  therein or  necessary to make the
statements  therein not  misleading,  or that the  



                                Page 137 of 162
<PAGE>

Prospectus  contained in such Registration  Statement as of its date and, in the
case of the opinion dated the date of  Consummation of the Exchange Offer, as of
the date of  Consummation,  contained an untrue  statement of a material fact or
omitted  to state a  material  fact  necessary  in order to make the  statements
therein,  in the light of the  circumstances  under  which they were  made,  not
misleading.  Without limiting the foregoing, such counsel may state further that
such  counsel  assumes  no  direct or  indirect  responsibility,  explicitly  or
implicitly, for, and has not independently verified, the accuracy,  completeness
or fairness of the financial  statements  (including,  without  limitation,  pro
forma financial statements), notes and schedules and other financial, numerical,
statistical  and accounting  information  and data included in any  Registration
Statement contemplated by this Agreement or the related Prospectus;  and Section

          19.04. a customary  comfort letter,  dated the date of Consummation of
the Exchange Offer, or as of the date of effectiveness of the Shelf Registration
Statement,  as the case may be, from the Company's independent  accountants,  in
the  customary  form and  covering  matters of the type  customarily  covered in
comfort letters to underwriters in connection with underwritten  offerings,  and
affirming  the matters set forth in the comfort  letters  delivered  pursuant to
Section 9(g) of the Purchase Agreement; and

deliver such other documents and certificates as may be reasonably  requested by
the  selling  Holders or such  Persons to evidence  compliance  with the matters
covered in clause (A) above and with any customary  conditions  contained in the
underwriting  or other  agreement  entered into by the Company  pursuant to this
clause (xi);

          (xii) prior to any public offering of Transfer Restricted  Securities,
          cooperate  with the selling  Holders and their  counsel in  connection
          with the  registration and  qualification  of the Transfer  Restricted
          Securities under the securities or Blue Sky laws of such jurisdictions
          as the  selling  Holders  may request and do any and all other acts or
          things  necessary  or  advisable  to enable  the  disposition  in such
          jurisdictions  of the Transfer  Restricted  Securities  covered by the
          applicable Registration Statement; provided, however, that the Company
          shall not be required to register or qualify as a foreign  corporation
          where it is not now so  qualified  or to take any  action  that  would
          subject it to the  service of process in suits or to  taxation,  other
          than as to  matters  and  transactions  relating  to the  Registration
          Statement, in any jurisdiction where it is not now so subject;

          (xiii) in connection with any sale of Transfer  Restricted  Securities
          that  will  result  in  such   securities  no  longer  being  Transfer
          Restricted  Securities,  cooperate  with the Holders to facilitate the
          timely preparation and delivery of certificates  representing Transfer
          Restricted  Securities  to be sold  and not  bearing  any  restrictive
          legends;  and to register such Transfer Restricted  Securities in such
          denominations  and such names as the  selling  Holders  may request at
          least two  Business  Days  prior to such sale of  Transfer  Restricted
          Securities;

          (xiv) use its best  efforts to cause the  disposition  of the Transfer
          Restricted  Securities  covered by the  Registration  Statement  to be
          registered  with or  approved by such other  governmental  agencies or
          authorities  as may be  necessary  to enable  the  seller  or  sellers
          thereof to consummate  the  disposition  of such  Transfer  Restricted
          Securities, subject to the proviso contained in clause (xii) above;
          

          (xv) provide a CUSIP number for all Transfer Restricted Securities not
          later than the effective  date of a  Registration  Statement  covering
          such Transfer Restricted  Securities and provide the Trustee under the
          Indenture  with  printed  certificates  for  the  



                                Page 138 of 162
<PAGE>

          Transfer  Restricted  Securities  which  are  in a form  eligible  for
          deposit with the Depository Trust Company;

          (xvi)  otherwise  use its best  efforts to comply with all  applicable
          rules and regulations of the Commission,  and make generally available
          to its  security  holders with regard to any  applicable  Registration
          Statement,  as soon as practicable,  a consolidated earnings statement
          meeting  the  requirements  of Rule 158  (which  need not be  audited)
          covering a twelve-month  period  beginning after the effective date of
          the  Registration  Statement (as such term is defined in paragraph (c)
          of Rule 158 under the Act);  

          (xvii) use its best  efforts to cause the  Indenture  to be  qualified
          under  the  TIA  not  later  than  the  effective  date  of the  first
          Registration  Statement  required by this Agreement and, in connection
          therewith,  cooperate  with the Trustee and the Holders to effect such
          changes to the  Indenture as may be required for such  Indenture to be
          so qualified in accordance  with the terms of the TIA; and execute and
          use its best  efforts to cause the Trustee to execute,  all  documents
          that may be required  to effect  such  changes and all other forms and
          documents  required  to be filed with the  Commission  to enable  such
          Indenture to be so qualified in a timely manner;  and 

          (xviii) provide  promptly to each Holder and Affiliated  Market Maker,
          upon request,  each document filed with the Commission pursuant to the
          requirements of Section 13 or Section 15(d) of the Exchange Act.

          (d)  Restrictions  on Holders.  Each Holder agrees by acquisition of a
Transfer  Restricted Security and each Affiliated Market Maker agrees that, upon
receipt of the notice referred to in Section 6(c)(iii)(C) or any notice from the
Company  of the  existence  of  any  fact  of  the  kind  described  in  Section
6(c)(iii)(D) hereof (in each case, a "Suspension Notice"), such Holder or Person
will  forthwith  discontinue   disposition  of  Transfer  Restricted  Securities
pursuant  to the  applicable  Registration  Statement  until (i) such  Holder or
Person  has  received  copies  of  the   supplemented   or  amended   Prospectus
contemplated  by  Section  6(c)(iv)  hereof,  or (ii)  such  Holder or Person is
advised in writing by the Company that the use of the Prospectus may be resumed,
and has  received  copies of any  additional  or  supplemental  filings that are
incorporated  by reference in the Prospectus (in each case, the  "Recommencement
Date").  Each Holder or Person receiving a Suspension  Notice hereby agrees that
it will either (i) destroy any  Prospectuses,  other than permanent file copies,
then in such  Holder's or Person's  possession  which have been  replaced by the
Company with more recently dated Prospectuses or (ii) deliver to the Company (at
the Company's  expense) all copies,  other than permanent  file copies,  then in
such  Holder's  Person's  possession  of the  Prospectus  covering such Transfer
Restricted  Securities that was current at the time of receipt of the Suspension
Notice.  The  time  period  regarding  the  effectiveness  of such  Registration
Statement set forth in Section 3 or 4 hereof,  as applicable,  shall be extended
by a number of days equal to the number of days in the period from and including
the date of  delivery  of the  Suspension  Notice to the date of delivery of the
Recommencement Date.

                                   ARTICLE XX
                              REGISTRATION EXPENSES


          (a)  All  expenses  incident  to  the  Company's   performance  of  or
compliance  with this  Agreement  will be borne by the  Company,  regardless  of
whether  a  Registration   Statement   becomes   effective,   including  without
limitation: (i) all registration and filing fees and expenses; (ii) all fees and
expenses of compliance with federal  securities and state Blue Sky or securities
laws; (iii) all expenses of printing  (including  printing  certificates for the
Exchange Notes to be issued in the Exchange  Offer and printing of 



                                Page 139 of 162
<PAGE>

Prospectuses  whether  for  exchanges,   sales,  market  making  or  otherwise),
messenger and delivery  services and telephone;  (iv) all fees and disbursements
of  counsel  for  the  Company  and one  counsel  for the  Holders  of  Transfer
Restricted Securities as provided in Section 7(b) below; (v) all application and
filing  fees in  connection  with  listing  the  Exchange  Notes  on a  national
securities  exchange or automated  quotation system pursuant to the requirements
hereof;  and (vi) all fees and  disbursements  of independent  certified  public
accountants  of the Company  (including  the  expenses of any special  audit and
comfort letters required by or incident to such performance).  

          The Company will, in any event, bear its internal expenses (including,
without  limitation,  all salaries  and  expenses of its officers and  employees
performing legal or accounting duties), the expenses of any annual audit and the
fees and  expenses of any Person,  including  special  experts,  retained by the
Company.


          (b) In connection  with any  Registration  Statement  required by this
Agreement  (including,  without  limitation,  the  Exchange  Offer  Registration
Statement and the Shelf Registration Statement),  the Company will reimburse the
Initial  Purchasers  and the Holders of Transfer  Restricted  Securities who are
tendering  Notes in the  Exchange  Offer and/or  selling or  reselling  Notes or
Exchange Notes pursuant to the "Plan of Distribution"  contained in the Exchange
Offer Registration Statement or the Shelf Registration Statement, as applicable,
for the  reasonable  fees and  disbursements  of not more than one counsel,  who
shall be Paul,  Hastings,  Janofsky & Walker LLP,  unless  another firm shall be
chosen  by the  Holders  of a  majority  in  principal  amount  of the  Transfer
Restricted  Securities  for whose benefit such  Registration  Statement is being
prepared. 

                                  ARTICLE XXI
                                 INDEMNIFICATION


          (a) The Company agrees to indemnify and hold harmless each Holder, its
directors,  officers and each Person,  if any, who controls such Holder  (within
the meaning of Section 15 of the Act or Section 20 of the  Exchange  Act),  from
and  against any and all  losses,  claims,  damages,  liabilities  or  judgments
(including  without  limitation,   any  legal  or  other  expenses  incurred  in
connection with investigating or defending any matter, including any action that
could give rise to any such losses, claims,  damages,  liabilities or judgments)
caused by any untrue  statement or alleged  untrue  statement of a material fact
contained in any Registration  Statement,  preliminary  prospectus or Prospectus
(or any amendment or supplement  thereto)  provided by the Company to any Holder
or any prospective purchaser of Exchange Notes or registered Notes, or caused by
any omission or alleged omission to state therein a material fact required to be
stated  therein or  necessary  to make the  statements  therein not  misleading,
except  insofar as such losses,  claims,  damages,  liabilities or judgments are
caused by (i) an untrue  statement  or omission or alleged  untrue  statement or
omission that is based upon information relating to any of the Holders furnished
in writing to the Company by any of the Holders or (ii) an untrue  statement  or
alleged  untrue  statement  or omission or alleged  omission in any  preliminary
prospectus that was corrected by the Prospectus and such Holder failed to comply
with such  Prospectus  delivery  requirements  as are  applicable to it and such
loss,  claim,  damage,  liability  or  judgment  would  not have  arisen if such
Prospectus had been so delivered. 

          (b) Each  Holder of  Transfer  Restricted  agrees,  severally  and not
jointly,  to  indemnify  and hold  harmless  the Company and its  directors  and
officers,  and each Person,  if any, who controls (within the meaning of Section
15 of the Act or Section 20 of the Exchange Act) the Company, to the same extent
as the foregoing  indemnity from the Company set forth in section (a) above, but
only (i) with  reference  to  information  relating to such Holder  furnished in
writing to the  Company by such  Holder  expressly  for use in any  Registration
Statement or (ii) if an untrue statement or alleged untrue statement or omission
or  



                                Page 140 of 162
<PAGE>

alleged  omission in any preliminary  prospectus was corrected by the Prospectus
and such Holder failed to comply with such Prospectus  delivery  requirements as
are applicable to it and such loss, claim,  damage,  liability or judgment would
not have arisen if such Prospectus had been so delivered.  In no event shall any
Holder, its directors, officers or any Person who controls such Holder be liable
or responsible  for any amount in excess of the amount by which the total amount
received  by  such  Holder  with  respect  to its  sale of  Transfer  Restricted
Securities  pursuant to a Registration  Statement exceeds (i) the amount paid by
such Holder for such Transfer  Restricted  Securities and (ii) the amount of any
damages that such  Holder,  its  directors,  officers or any Person who controls
such  Holder has  otherwise  been  required  to pay by reason of such  untrue or
alleged  untrue  statement or omission or alleged  omission or failure to comply
with such Prospectus delivery requirements as are applicable to it.

          (c) In case any  action  shall be  commenced  involving  any Person in
respect of which  indemnity may be sought  pursuant to Section 8(a) or 8(b) (the
"indemnified  party"),  the  indemnified  party shall promptly notify the person
against whom such indemnity may be sought (the "indemnifying person") in writing
and the  indemnifying  party shall assume the defense of such action,  including
the employment of counsel  reasonably  satisfactory to the indemnified party and
the payment of all fees and expenses of such counsel,  as incurred  (except that
in the case of any action in respect of which  indemnity may be sought  pursuant
to both  Sections  8(a) and 8(b),  a Holder  shall not be required to assume the
defense of such action  pursuant to this Section 8(c),  but may employ  separate
counsel and  participate  in the defense  thereof,  but the fees and expenses of
such counsel,  except as provided below, shall be at the expense of the Holder).
Any  indemnified  party shall have the right to employ  separate  counsel in any
such action and participate in the defense thereof, but the fees and expenses of
such  counsel  shall be at the expense of the  indemnified  party unless (i) the
employment of such counsel shall have been specifically authorized in writing by
the indemnifying  party, (ii) the indemnifying party shall have failed to assume
the  defense of such action or employ  counsel  reasonably  satisfactory  to the
indemnified  party or (iii) the named parties to any such action  (including any
impleaded  parties)  include  both the  indemnified  party and the  indemnifying
party,  and the  indemnified  party shall have been advised by such counsel that
there may be one or more legal defenses available to it which are different from
or additional to those  available to the  indemnifying  party (in which case the
indemnifying party shall not have the right to assume the defense of such action
on behalf of the indemnified  party).  In any such case, the indemnifying  party
shall not,  in  connection  with any one 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 fees and expenses of
more than one separate firm of attorneys (in addition to any local  counsel) for
all  indemnified  parties and all such fees and expenses  shall be reimbursed as
they are incurred. Such firm shall be designated in writing by a majority of the
Holders, in the case of the parties indemnified pursuant to Section 8(a), and by
the Company in the case of parties  indemnified  pursuant to Section  8(b).  The
indemnifying  party shall indemnify and hold harmless the indemnified party from
and against any and all losses,  claims,  damages,  liabilities and judgments by
reason of any settlement of any action (i) effected with its written  consent or
(ii) effected without its written consent if the settlement is entered into more
than 20 Business Days after the indemnifying party shall have received a request
from the  indemnified  party  for  reimbursement  for the fees and  expenses  of
counsel  (in any case where  such fees and  expenses  are at the  expense of the
indemnifying party) and, prior to the date of such settlement,  the indemnifying
party  shall  have  failed  to  comply  with  such  reimbursement   request.  No
indemnifying  party shall,  without the prior written consent of the indemnified
party,  effect  any  settlement  or  compromise  of, or  consent to the entry of
judgment with respect to, any pending or  threatened  action in respect of which
the  indemnified  party  is  or  could  have  been  a  party  and  indemnity  or
contribution  may be or could  have been  sought  hereunder  by the  indemnified
party,   unless  such  settlement,   compromise  or  judgment  (i)  includes  an
unconditional release of the indemnified party from all liability on claims that
are or could  have  been the  subject  matter of such  action  and (ii) does not
include a statement as to or an admission of fault,  culpability or a failure to
act,  by or on behalf  of the  indemnified  party.  


                                Page 141 of 162
<PAGE>

          (d) To the  extent  that  the  indemnification  provided  for in  this
Section 8 is  unavailable  to an  indemnified  party in respect  of any  losses,
claims,  damages,  liabilities  or  judgments  referred  to  therein,  then each
indemnifying  party,  in lieu of  indemnifying  such  indemnified  party,  shall
contribute to the amount paid or payable by such  indemnified  party as a result
of such losses, claims, damages, liabilities or judgments (i) in such proportion
as is appropriate to reflect the relative benefits  received by the Company,  on
the one hand,  and the Holders,  on the other hand,  from their sale of Transfer
Restricted  Securities or (ii) if the  allocation  provided by clause 8(d)(i) is
not permitted by applicable law, in such proportion as is appropriate to reflect
not only the relative  benefits referred to in clause 8(d)(i) above but also the
relative fault of the Company,  on the one hand, and of the Holder, on the other
hand, in connection  with the  statements  or omissions  which  resulted in such
losses, claims, damages, liabilities or judgments, as well as any other relevant
equitable  considerations.  The relative fault of the Company,  on the one hand,
and of the Holder, on the other hand, shall be determined by reference to, among
other things,  whether the untrue or alleged untrue statement of a material fact
or the  omission  or alleged  omission to state a material  fact  relates to (A)
information  supplied by the Company on the one hand,  or by the Holder,  on the
other hand, or (B) an untrue  statement or alleged untrue  statement or omission
or alleged  omission therein that was corrected by the Prospectus and any Holder
failed to comply with such Prospectus delivery requirements as are applicable to
it and such loss, claim, damage,  liability or judgment would not have arisen if
such  Prospectus  had  been so  delivered,  and the  parties'  relative  intent,
knowledge,  access to  information  and  opportunity  to correct or prevent such
statement or omission.  The amount paid or payable by a party as a result of the
losses,  claims,  damages,  liabilities and judgments referred to above shall be
deemed to include,  subject to the limitations set forth in the second paragraph
of Section 8(a), any legal or other fees or expenses reasonably incurred by such
party in connection  with  investigating  or defending any action or claim.  

          The  Company  and each  Holder  agree  that it  would  not be just and
equitable if  contribution  pursuant to this Section 8(d) were determined by pro
rata  allocation  (even if the  Holders  were  treated  as one  entity  for such
purpose) or by any other method of allocation which does not take account of the
equitable considerations referred to in the immediately preceding paragraph. The
amount  paid or  payable  by an  indemnified  party as a result  of the  losses,
claims,  damages,  liabilities  or  judgments  referred  to in  the  immediately
preceding  paragraph shall be deemed to include,  subject to the limitations set
forth above, any legal or other expenses reasonably incurred by such indemnified
party in connection with investigating or defending any matter.  Notwithstanding
the provisions of this Section 8, no Holder, its directors,  its officers or any
Person, if any, who controls such Holder shall be required to contribute, in the
aggregate, any amount in excess of the amount by which the total amount received
by such  Holder  with  respect  to the sale of  Transfer  Restricted  Securities
pursuant to a Registration  Statement exceeds (i) the amount paid by such Holder
for such Transfer Restricted Securities and (ii) the amount of any damages which
such  Holder has  otherwise  been  required  to pay by reason of such  untrue or
alleged  untrue  statement or omission or alleged  omission or failure to comply
with such  Prospectus  delivery  requirements as are applicable to it. No person
guilty of fraudulent  misrepresentation  (within the meaning of Section 11(f) of
the Act) shall be entitled to contribution from any person who was not guilty of
such  fraudulent  misrepresentation.  The  Holders'  obligations  to  contribute
pursuant  to this  Section  8(c) are  several in  proportion  to the  respective
principal amount of Transfer Restricted Securities held by each Holder hereunder
and not joint.



                                Page 142 of 162
<PAGE>

          (e) The Company agrees that the indemnity and contribution  provisions
of this Section 8 shall apply to Affiliated Market Makers to the same extent, on
the same conditions, as it applies to Holders.

                                  ARTICLE XXII
                               144A and RULE 144

               The Company agrees with each Holder,  for so long as any Transfer
Restricted  Securities  remain  outstanding  and  during any period in which the
Company (i) is not subject to Section 13 or 15(d) of the  Exchange  Act, to make
available,  upon request of any Holder,  to such Holder or  beneficial  owner of
Transfer  Restricted  Securities  in  connection  with any sale  thereof and any
prospective  purchaser of such Transfer Restricted Securities designated by such
Holder or beneficial  owner,  the information  required by Rule 144A(d)(4) under
the Act in  order to  permit  resales  of such  Transfer  Restricted  Securities
pursuant  to Rule  144A,  and (ii) is  subject  to  Section  13 or 15 (d) of the
Exchange Act, to make all filings  required  thereby in a timely manner in order
to permit resales of such Transfer Restricted Securities pursuant to Rule 144.

                                 ARTICLE XXIII
                                  MISCELLANEOUS


          (a) Remedies.  The Company acknowledges and agrees that any failure by
it to comply with its  obligations  under  Sections 3 and 4 hereof may result in
material  irreparable  injury  to  the  Initial  Purchasers  or the  Holders  or
Affiliated  Market Makers for which there is no adequate  remedy at law, that it
will not be possible to measure damages for such injuries precisely and that, in
the  event  of any  such  failure,  the  Initial  Purchasers  or any  Holder  or
Affiliated  Market  Makers  may  obtain  such  relief  as  may  be  required  to
specifically  enforce the Company's  obligations  under Sections 3 and 4 hereof.
The  Company  further  agrees to waive the  defense in any  action for  specific
performance  that a  remedy  at  law  would  be  adequate.  

          (b) No Inconsistent Agreements.  The Company will not, on or after the
date of this Agreement,  enter into any agreement with respect to its securities
that is inconsistent with the rights granted to the Holders in this Agreement or
otherwise conflicts with the provisions hereof.  Except as set forth on Schedule
A attached  hereto,  there are no agreements  between the Company and any Person
granting  such Person any  registration  rights with respect to its  securities.
Except as set forth on  Schedule A attached  hereto,  the rights  granted to the
Holders  hereunder do not conflict with the rights granted to the holders of the
Company's  securities  under any  agreement  in effect on the date  hereof. 

          (c) Amendments  and Waivers.  The provisions of this Agreement may not
be amended,  modified or supplemented,  and waivers or consents to or departures
from the provisions  hereof may not be given unless (i) in the case of Section 5
hereof and this Section  10(c)(i),  the Company has obtained the written consent
of Holders of all  outstanding  Transfer  Restricted  Securities and (ii) in the
case of all other  provisions  hereof,  the  Company  has  obtained  the written
consent of Holders of a majority of the outstanding principal amount of Transfer
Restricted  Securities  (excluding  Transfer  Restricted  Securities held by the
Company or its Affiliates).  Notwithstanding the foregoing,  a waiver or consent
to departure from the provisions  hereof that relates  exclusively to the rights
of Holders whose Transfer  Restricted  Securities are being tendered pursuant to
the Exchange  Offer,  and that does not affect directly or indirectly the rights
of other Holders whose  Transfer  Restricted  Securities  are not being tendered
pursuant to such  Exchange  Offer,  may be given by the Holders of a majority of
the outstanding  principal amount of Transfer  Restricted  Securities subject to
such Exchange  Offer.  



                                Page 143 of 162
<PAGE>

          (d) Third Party Beneficiary.  The Holders and Affiliated Market Makers
shall be third party  beneficiaries to the agreements made hereunder between the
Company,  on the one hand,  and the Initial  Purchasers,  on the other hand, and
shall have the right to enforce such agreements  directly to the extent they may
deem such enforcement necessary or advisable to protect its rights or the rights
of Holders and Affiliated Market Makers hereunder. 

          (e)  Notices.  All notices and other  communications  provided  for or
permitted hereunder shall be made in writing by hand-delivery,  first-class mail
(registered or certified,  return receipt requested),  telex, telecopier, or air
courier guaranteeing overnight delivery:

          (i)     if to a Holder,  at the  address  set forth on the  records of
          the Registrar under the Indenture,  with a copy to the Registrar under
          the Indenture; and

          (ii)   if to the Company:
                 PSINet Inc. 
                 510 Huntmar Park Drive 
                 Herndon, VA  20170-5100

                  Telecopier No.:          (703) 904-9527
                  Attention: David N. Kunkel
                               Senior Vice President and General Counsel

                  With a copy to:

                  Nixon, Hargrave, Devans & Doyle LLP
                  437 Madison Avenue
                  New York, NY 10022

                  Telecopier No.:          (212) 940-3111
                  Attention:  Richard F. Langan, Jr.

                  All such  notices and  communications  shall be deemed to have
been duly given:  at the time delivered by hand, if personally  delivered;  five
Business Days after being  deposited in the mail,  postage  prepaid,  if mailed;
when receipt  acknowledged,  if  telecopied;  and on the next  business  day, if
timely delivered to an air courier guaranteeing overnight delivery.

                  Copies of all such  notices,  demands or other  communications
shall be concurrently  delivered by the Person giving the same to the Trustee at
the address specified in the Indenture.

                  Upon  the  date of  filing  of the  Exchange  Offer or a Shelf
Registration  Statement,  as the  case may be,  notice  shall  be  delivered  to
Donaldson,  Lufkin & Jenrette Securities  Corporation,  on behalf of the Initial
Purchasers (in the form attached hereto as Exhibit A) and shall be addressed to:
Attention:  Louise Guarneri (Compliance Department),  277 Park Avenue, New York,
New York 10172.


          (f) 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  limitation and without the need for an express  assignment,
subsequent Holders;  provided, that nothing herein shall be deemed to permit any
assignment,  transfer or other disposition of Transfer Restricted  Securities in
violation of the terms hereof or of the Purchase Agreement or the Indenture.  If
any transferee of any Holder shall acquire Transfer



                                Page 144 of 162
<PAGE>

Restricted  Securities in any manner  permitted by this Agreement,  the Purchase
Agreement  and the  Indenture,  whether by operation of law or  otherwise,  such
Transfer Restricted Securities shall be held subject to all of the terms of this
Agreement,  the Purchase Agreement and the Indenture,  and by taking and holding
such Transfer Restricted Securities, such Person shall be conclusively deemed to
have  agreed to be bound by and to perform  all of the terms and  provisions  of
this  Agreement,  the  Purchase  Agreement  and  the  Indenture,  including  the
restrictions on resale set forth in this Agreement,  the Purchase  Agreement and
the Indenture, and such Person shall be entitled to receive the benefits hereof.

          (g)  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. 

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

          (i) 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 CONFLICTS OF LAW RULES THEREOF.

          (j) Severability.  In the event that any one or more of the provisions
contained  herein,  or the  application  thereof  in any  circumstance,  is held
invalid, illegal or unenforceable,  the validity, legality and enforceability of
any such  provision  in every  other  respect  and of the  remaining  provisions
contained  herein  shall  not  be  affected  or  impaired  thereby.  

          (k) Entire  Agreement.  This Agreement is intended by the parties as a
final  expression of their agreement and intended to be a complete and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the  subject  matter  contained  herein.  There are no  restrictions,  promises,
warranties  or  undertakings,  other than those set forth or  referred to herein
with  respect to the  registration  rights  granted with respect to the Transfer
Restricted  Securities.  This  Agreement  supersedes  all prior  agreements  and
understandings between the parties with respect to such subject matter.



                                Page 145 of 162
<PAGE>




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

                                            PSINET INC.


                                            By: /s/ Edward D. Postal
                                            Name: Edward D. Postal
                                            Title: Senior Vice President
                                                    and Chief Financial Officer



                                            DONALDSON, LUFKIN & JENRETTE
                                            SECURITIES CORPORATION


                                            By: /s/ Ronald F. Zampolin
                                            Name: Ronald F. Zampolin
                                            Title: Vice President



                                            MERRILL LYNCH, PIERCE,
                                            FENNER & SMITH INCORPORATED


                                            By: /s/ Joseph B. Sheehan
                                            Name: Joseph B. Sheehan
                                            Title: Director



                                            CHASE SECURITIES INC.


                                            By: /s/ Kristen B. Selvala
                                            Name: Kristen B. Selvala
                                            Title: Vice President



                                Page 146 of 162
<PAGE>




                                    EXHIBIT A

                               NOTICE OF FILING OF
                      EXCHANGE OFFER REGISTRATION STATEMENT


To:        Donaldson, Lufkin & Jenrette Securities Corporation
           277 Park Avenue
           New York, New York  10172
           Attention:  Louise Guarneri (Compliance Department)
           Fax: (212) 892-7272

From:    PSINet Inc.
         10% Senior Notes due 2005


Date: ___, 199_

         For your information only (NO ACTION REQUIRED):

         Today,  ______,  199_, we filed [an Exchange  Registration  Statement/a
Shelf Registration  Statement] with the Securities and Exchange  Commission.  We
currently expect this registration  statement to be declared effective within __
business days of the date hereof.




                                Page 147 of 162


                                                                    Exhibit 10.2






                            INTEREST ESCROW AGREEMENT



                                      Among



                            WILMINGTON TRUST COMPANY
                        (as "Escrow Agent" and "Trustee")



                                       and



                                   PSINET Inc.
                                   ("Company")



                                 April 13, 1998


                                Page 148 of 162
<PAGE>


                            INTEREST ESCROW AGREEMENT


                  INTEREST ESCROW AGREEMENT ("Agreement"), dated as of April 13,
1998 by and among  WILMINGTON  TRUST COMPANY,  a Delaware  banking  corporation,
escrow agent (together with any Subcustodian (as defined below), "Escrow Agent")
and as trustee for the  benefit of the  holders of the Notes (as defined  below)
under the Indenture (as defined below) (the  "Trustee"),  and PSINET INC., a New
York corporation (the "Company").

                                    RECITALS
                           A.  Pursuant to that  certain  Indenture  dated as of
                  April 13, 1998,  by and among the Company and the Trustee (the
                  "Indenture"),  the Company has issued  $600,000,000  aggregate
                  principal  amount of its 10% Senior  Notes due 2005  (together
                  with the notes issued in connection  with the Exchange  Offer,
                  the "Notes").

                           B. The parties are  entering  into this  Agreement to
                  set forth the conditions upon which,  and the manner in which,
                  funds will be disbursed from the Interest Escrow Account to be
                  established  pursuant to this  Agreement and released from the
                  security  interest and lien  described in Section 6(a) of this
                  Agreement.


                                    AGREEMENT

                  NOW,  THEREFORE,  for good  and  valuable  consideration,  the
receipt and  sufficiency  of which are hereby  acknowledged,  the parties hereto
agree as follows:

         1. Defined Terms.  Capitalized terms used herein but not defined herein
shall have the meaning given in the Indenture.  In addition to any other defined
terms used  herein,  the  following  terms shall  constitute  defined  terms for
purposes of this Agreement and shall have the meanings set forth below:

                  "Acceptable  Replacement  Escrow  Agent"  means a  corporation
organized and doing  business  under the laws of the United States of America or
of any state thereof  authorized under such laws to exercise  corporate  trustee
power,  subject to supervision or examination by federal or state  authority and
having a combined  capital and surplus of at least $100  million as set forth in
its most recent published annual report of condition.

                  "Affiliates" means, as applied to any Person, any other Person
directly or indirectly  controlling,  controlled by, or under direct or indirect
common control with,  such Person.  For purposes of this  definition,  "control"
(including,  with correlative meanings, the terms "controlling," "controlled by"
and  "under  common  control  with"),  as  applied  to  any  Person,  means  the
possession,  directly  or  indirectly,  of the  power to  direct  or  cause  the
direction of the  management  and policies of such Person,  whether  through the
ownership of voting securities, by contract or otherwise.

                  "Available  Funds" means (A) the sum of (i) the Initial Escrow
Amount and (ii) interest and other amounts earned,  if any, or dividends paid on
the funds in the Interest Escrow Account (including  holdings of U.S. Government
Securities),  less (B) the aggregate  disbursements  previously made pursuant to
this Agreement.

                  "Collateral"  hall  have the  meaning  given  in  Section 6(a)
hereof.

                  "Escrow Agent"  has  the  meaning set  forth  in Section  2(a)
hereof.


                                Page 149 of 162
<PAGE>


                  "Escrow Account Statement" shall  have the  meaning  given  in
Section 2(g).

                  "Initial Escrow Amount" means $138.7 million.

                  "Interest Escrow Account" means the escrow account established
pursuant to Section 2.

                  "Issue Date" means April 13, 1998.

                  "Payment Notice and Disbursement  Request" means a notice sent
by the Trustee to the Escrow Agent  requesting a disbursement  of funds from the
Interest Escrow Account,  in  substantially  the form of Exhibit A hereto.  Each
Payment  Notice and  Disbursement  Request  shall be signed by an officer of the
Trustee.

                  "U.S.  Government  Securities" mean securities that are direct
obligations of the United States of America, the payment of which its full faith
and credit is pledged.

         2.    Interest Escrow Account, Escrow Agent.

         (a)   Appointment of Escrow Agent.  The Trustee and the Company  hereby
appoint  Wilmington  Trust Company,  and Wilmington Trust Company hereby accepts
appointment, as escrow agent (the "Escrow Agent") under the terms and conditions
of this  Agreement.  The term  "Escrow  Agent"  shall be deemed to  include  any
successor to, or Subcustodian located in the State of New York  ("Subcustodian")
appointed by, the Escrow Agent.

         (b)   Establishment of Interest Escrow Account.

                  (i)  Concurrently  with the  execution  and  delivery  hereof,
Escrow Agent shall establish the Interest Escrow Account, a non-interest bearing
account,  at the office of the Escrow Agent or Subcustodian in New York. Subject
to the security  interest  granted  therein for the benefit of the Trustee,  and
subject to the other terms and conditions of this Agreement,  all funds accepted
by Escrow  Agent  pursuant  to this  Agreement  shall be held for the  exclusive
benefit of the Trustee, for the ratable benefit of the holders of the Notes. All
such funds shall be held in the  Interest  Escrow  Account  until  disbursed  in
accordance with the terms hereof. The Interest Escrow Account, and the funds and
any U.S. Government  Securities and permitted Cash Equivalents and proceeds held
therein by the Escrow  Agent,  shall be deemed to be under the sole dominion and
control of Escrow  Agent for the benefit of the Trustee for the ratable  benefit
of the holders of the Notes and all such funds shall be held by the Escrow Agent
separate and apart from all other funds of or held by the Escrow Agent,  subject
to Section 5. Concurrently  with the execution and delivery hereof,  the Company
shall deliver the Initial Escrow Amount to the Escrow Agent for deposit into the
Interest Escrow Account against the Escrow Agent's  written  acknowledgment  and
receipt of the Initial Escrow Amount.  The Escrow Agent hereby  acknowledges the
security  interest in the  Collateral in favor of the Trustee as a secured party
for the ratable  benefit of the holders of the Notes.  The Escrow Agent does not
have any interest in the  Collateral  except as escrow holder for the benefit of
the  Trustee for the  ratable  benefit of the holders of the Notes.  The parties
acknowledge  that  this  Agreement  is  intended  to  establish  control  of the
Collateral  in favor of the Escrow  Agent for the  benefit  of  Trustee  for the
ratable  benefit of the holders of the Notes in  accordance  and for purposes of
Section 8-106 of the Uniform Commercial Code.

         The Company  shall pay or  reimburse  the Escrow Agent upon request for
any transfer  taxes or other taxes,  fees,  charges or expenses  relating to the
Collateral incurred in connection herewith and shall indemnify and hold harmless
the Escrow Agent from any amounts that it is obligated to pay in the way of such
taxes,  fees,  charges or  expenses.  Any  payments of income from the  Interest
Escrow  Account shall 



                                Page 150 of 162
<PAGE>

be  subject to  withholding  regulations  then in force  with  respect to United
States taxes.  The parties hereto will provide the Escrow Agent with appropriate
W-9  forms for tax I.D.  number  certifications,  or W-8 forms for  non-resident
alien  certifications.   It  is  understood  that  the  Escrow  Agent  shall  be
responsible  for  income  reporting  only  with  respect  to  income  earned  on
investment of funds which are part of the Collateral and is not  responsible for
any  other  reporting.   This  paragraph  shall  survive   notwithstanding   any
termination of this Escrow Agreement or the resignation of the Escrow Agent.

         (c)   Escrow Agent Compensation.

                  (i) Escrow Agent and any Acceptable  Replacement  Escrow Agent
shall be compensated  pursuant to a separate  agreement  between the Company and
Escrow Agent or such Acceptable Replacement Escrow Agent.

                  (ii) To the extent not paid by the  Company  when due,  Escrow
Agent shall be entitled to disburse from the Interest Escrow Account all amounts
due to Escrow Agent as compensation for services to be performed by Escrow Agent
under this Agreement (as determined by agreement with the Company or pursuant to
this Section 2(c)(ii)).

         (d)   Investment of Funds in Interest Escrow Account.   Funds deposited
in the  Interest  Escrow  Account  shall be  invested  and  reinvested  upon the
following terms and conditions:

                  (iii) Acceptable Investments.  Funds deposited in the Interest
Escrow Account (including proceeds of any U.S. Government Securities at maturity
and interest and other earnings paid on any such investments)  shall be invested
by the  Escrow  Agent  in U.S.  Government  Securities  or  temporarily  in Cash
Equivalents  of the type referred to in clauses (ii) and (iv) of the  definition
of Cash Equivalents in the Indenture,  in accordance with the Company's  written
instructions to the Escrow Agent  accompanied by a certification  of the Company
that such  investments are in accordance  with the terms of this paragraph.  The
Company  shall so instruct the Escrow Agent in a manner such that the Company in
its sole discretion  determines at such time is in accordance with the Indenture
and will generate  sufficient funds available without any further deposit by the
Company of funds or securities  into the Interest Escrow Account (other than the
reinvestment of funds in U.S. Government Securities,  Cash Equivalents permitted
herein and funds held in the form of cash as U.S. Government  Securities mature)
to cover all interest due on the  outstanding  Notes,  as such interest  becomes
due, for each Interest  Payment Date occurring from the Issue Date and ending on
(and  including)  the fifth such  Interest  Payment  Date.  Any U.S.  Government
Securities  constituting  Collateral  maintained  with the Federal  Reserve Bank
shall be  transferred  to a book-entry  account in the name of the Escrow Agent,
for the benefit of the  Trustee  for the  ratable  benefit of the holders of the
Notes,  (subject  to Section 3 and  Section  5). The Escrow  Agent shall have no
responsibility for determining whether funds held in the Interest Escrow Account
shall have been invested in such a manner so as to comply with the  requirements
of the second  sentence of this clause (i) or the  Indenture,  and shall have no
responsibility  for, and the Company  indemnifies  and holds harmless the Escrow
Agent from any liability in connection  with, any gain or loss on any investment
made  pursuant to this clause (i) or the lack of sufficient  funds  available in
the Interest  Escrow  Account to cover all interest or other  amounts due on any
Interest Payment Date or otherwise.

                  (iv) Security Interest in Investments.  No investment of funds
in the Interest Escrow Account shall be made unless the Company has certified to
Escrow  Agent upon  advice of legal  counsel  that,  upon such  investment,  the
Trustee will have a perfected  security  interest in the  applicable  investment
(such  advice of legal  counsel  relating  solely to the manner of  perfecting a
security  interest in a particular  type of investment,  but not to whether such
perfection  has been achieved in the  instance).  A certificate as to a class of
investments  need not be  issued  with  respect  to  individual  investments  in
securities  in that class if the  certificate  applicable  to the class  remains
accurate with respect to such individual  investments, 



                                Page 151 of 162
<PAGE>

which continued accuracy the Escrow Agent may conclusively  assume.  When and if
the  Indenture is qualified  under the Trust  Indenture  Act of 1939, as amended
(the  "TIA"),  to the  extent,  if  any,  that  Section  314(b)  of  the  TIA is
applicable,  on such date and on each annual  anniversary of such date until the
date upon which the balance of the  Available  Funds shall have been  reduced to
zero,  each of the  Trustee  and the Escrow  Agent  shall  receive an opinion of
counsel to the Company, dated each such date as applicable,  which opinion shall
meet the requirements of Section 314(b) of the TIA.

                  (v) Interest and Dividends.  Subject to the security  interest
granted  therein for the  benefit of the Trustee for the ratable  benefit of the
holders of the Notes,  and  subject to the other  terms and  conditions  of this
Agreement,  all interest and other amounts  earned and  dividends  paid on funds
invested  in such U.S.  Government  Securities  in  accordance  with the written
instructions  of the Company shall be deposited in the Interest  Escrow Account,
and commingled with the funds therein,  for the exclusive benefit of the Trustee
for the ratable benefit of the holders of the Notes (subject to Sections 3 and 5
hereof)  and shall be  reinvested  in  accordance  with the terms  hereof at the
Company's written instruction and subject to disbursement as provided herein.

         (e)   Limitation on Escrow Agent's Responsibilities.

                  (vi)  Escrow  Agent's  duties  and  responsibilities  shall be
limited to those  expressly set forth in this  Agreement.  Without  limiting the
foregoing,  the Escrow Agent shall  maintain  continuous  exclusive  possession,
dominion and control of cash included in the  Collateral and will cause the U.S.
Government  Securities  to  be  registered  in  the  book-entry  system  of  and
transferred to an account of the Escrow Agent or a sub-agent of the Escrow Agent
at the Federal Reserve Bank.  Escrow Agent shall not be subject to, or obligated
to recognize,  any agreement other than this Agreement to which the Company, the
Trustee,  or either of them may be a party.  References in this Agreement to any
such agreement are for identification and definitional purposes only.

                  (vii)  Escrow Agent shall have no  obligation  with respect to
the  Interest  Escrow  Account  other  than to  follow  faithfully  instructions
contained in this Agreement or delivered to Escrow Agent in accordance with this
Agreement.  Escrow Agent may rely and act upon any written notice,  instruction,
direction,  request,  waiver,  consent,  receipt,  or other  paper  or  document
("Instructions")  which it  believes  in good  faith to be  genuine  and what it
purports to be.  Escrow Agent shall be subject to no  liability  with respect to
the form, execution, or validity of any such Instruction. The Escrow Agent shall
not be liable for  verifying  the  accuracy  of any  certifications  made by the
Company or the Trustee,  including without limitation, in any Payment Notice and
Disbursement Request, pursuant to Section 2(d)(ii) hereof, or otherwise.

                  (viii)  Escrow  Agent  shall  not be  liable  for any error of
judgment,  or for any act done or step taken or omitted by it in good faith,  or
for any mistake of fact or law, or for doing anything  which,  in good faith, it
may do or refrain from doing in  connection  with the Interest  Escrow  Account,
except in each case in the event of Escrow  Agent's  gross  negligence or wilful
misconduct.

         (f)   Substitution of Escrow Agent.

                  (ix) The Company shall have the right to cause Escrow Agent to
be relieved of its duties  hereunder and to select a substitute  escrow agent to
serve  hereunder  (provided  such  substitute  escrow  agent  is  an  Acceptable
Replacement  Escrow  Agent),  upon the  expiration of thirty (30) days following
delivery of written notice of substitution to Escrow Agent and the Trustee. Upon
selection of such substitute  escrow agent, such substitute escrow agent and the
parties  hereto  other than the  substituted  escrow  agent  shall enter into an
agreement  substantially  identical to this  Agreement and,  thereafter,  Escrow
Agent  shall be  relieved of its duties and  obligations  to perform  hereunder,
except that Escrow  



                                Page 152 of 162
<PAGE>

Agent shall  transfer to the substitute  escrow agent upon request  therefor all
funds and U.S.  Government  Securities  maintained by Escrow Agent hereunder and
copies  of all  books,  records,  plans and other  documents  in Escrow  Agent's
possession  relating  to  such  funds  or  U.S.  Government  Securities  or this
Agreement.  

                  (x) Escrow Agent,  or any substitute  escrow agent, may at any
time resign and be discharged of its duties and obligations under this Agreement
by giving at least sixty (60) days' notice to the Company and the  Trustee.  The
Company  shall  appoint an  Acceptable  Replacement  Escrow Agent or  substitute
escrow agent within such sixty day period.

                  (xi) If the Company fails to appoint a substitute escrow agent
as required under  paragraph  (ii) above,  Escrow Agent shall deliver all assets
held in the Escrow Account to an Acceptable  Replacement  Escrow Agent of either
its choosing or as appointed by a court upon application therefor, or to a court
as directed.

                  (xii) Escrow Agent shall be discharged from any further duties
under this  Agreement upon its transfer of the assets held in the Escrow Account
to an Acceptable Replacement Escrow Agent.

         (g)   Interest Escrow Account Statement. The Escrow Agent shall deliver
to the Company and the Trustee a monthly statement setting forth with reasonable
particularity  the Collateral  then held by the Escrow Agent,  and the manner in
which such funds are invested (the "Escrow  Account  Statement").  The books and
records of the Escrow Agent with respect to the Interest Escrow Account shall be
open to inspection  and audit at  reasonable  times during  reasonable  business
hours by the Trustee and the Company or their  respective  representatives.  The
parties  hereto  irrevocably  instruct  Escrow Agent that on the first date upon
which the balance in the Interest Escrow Account  (including the holdings of all
U.S.  Government  Securities) is reduced to zero,  Escrow Agent shall deliver to
the Company and to the Trustee a notice that the balance in the Interest  Escrow
Account has been reduced to zero.

         (h)   Other Powers of Escrow Agent.

                  (xiii) Escrow Agent may register any  investments  held by the
Interest  Escrow  Account in its nominee  name  without  increase or decrease of
liability.

                  (xiv)  Escrow  Agent may consult  with and obtain  advice from
legal counsel in the event of any dispute or question as to the  construction of
any of the  provisions of this  Agreement or any of Escrow  Agent's duties under
this  Agreement,  and Escrow  Agent shall incur no  liability  in acting in good
faith in accordance with the advice of such counsel.  The fees for  consultation
with such counsel shall be a proper  expense  chargeable to the Interest  Escrow
Account without a Payment Notice and Disbursement Request,  provided that Escrow
Agent provides the Company with prior written notice of any such charge.

         (i)   Incumbency  Certificate. The Company  and the Trustee  each shall
provide a certificate  to Escrow Agent as to the  incumbency  and  signatures of
those individuals  authorized to provide from time to time instructions relating
to the Interest Escrow Account or to execute  documents to be provided to Escrow
Agent.  The Company and the Trustee also shall  promptly  notify Escrow Agent of
any changes to such a  certificate.  Escrow  Agent may rely on the  accuracy and
completeness  of any  such  certificate  unless  and  until it has  received  an
acceptable replacement certificate. All certificates provided under this Section
2(i)  shall  be  executed  by the  applicable  party's  corporate  secretary  or
assistant  secretary  or, if the party does not have a  corporate  secretary  or
assistant secretary, by an authorized officer.

         3.    Disbursements.


                                Page 153 of 162
<PAGE>

         (a)   Disbursements.  At least five  (5)  Business  Days  prior to each
Interest Payment Date described in Section 2(d)(i),  the Trustee shall submit to
the  Escrow  Agent  a  completed   Payment  Notice  and   Disbursement   Request
substantially  in the form of Exhibit A hereto and the Escrow Agent shall,  upon
acceptance of such Payment Notice and  Disbursement  Request,  and provided that
there are sufficient  funds in the Interest Escrow  Account,  disburse the funds
requested  to the  Trustee  for payment to the Holders of the Notes at or before
11:00  a.m.  New York  City  time on the  Interest  Payment  Date for  which the
completed  Payment Notice and  Disbursement  Request was  submitted.  The Escrow
Agent shall  notify the Trustee and the Company as soon as  reasonably  possible
(but not  later  than two (2)  Business  Days  from the date of  receipt  of the
Payment Notice and Disbursement  Request) if any Payment Notice and Disbursement
Request is rejected or not conforming  with the  requirements  of this Agreement
and the  reason(s)  therefor.  Escrow Agent shall have no obligation to make any
payment or disbursement  in connection with any Payment Notice and  Disbursement
Request  to the  extent,  if any,  which  there  are  insufficient  funds in the
Interest  Escrow  Account.  The Escrow  Agent and the Trustee  will  communicate
expeditiously and use their best effort to cure any defect therein.

         (b)   Retired Notes.  In the  event  a portion of  the Notes  has  been
retired by the Company and submitted to the Trustee for  cancellation  and there
is no Event of Default under the Indenture,  funds  representing the excess over
the amount  sufficient to pay interest  through and including the fifth Interest
Payment Date on the Notes not so retired and any amounts due to the Escrow Agent
shall,  upon written  request of the Trustee to the Escrow Agent, be paid to the
Company.  The Trustee  shall  provide  such notice to the Escrow  Agent (i) upon
receipt of notice of similar effect from, and  certification  of such retirement
by, the Company,  which notice and certification shall be provided to the Escrow
Agent and (ii) upon the  Company's  compliance  with the  release of  collateral
provisions of the TIA to the extent applicable.

         (c)   Excess Amounts. Notwithstanding anything in this Agreement to the
contrary,  so  long as no  Event  of  Default  shall  have  occurred  and  being
continuing,  at such time as all interest due on the Notes through and including
the fifth  Interest  Payment  Date on the  Notes  has been  paid to the  Holders
thereof  pursuant to the  Indenture and in  accordance  herewith,  and all other
amounts due and owing under this Agreement and the Indenture,  including but not
limited to the compensation,  expenses, disbursements and advances of the Escrow
Agent and the Trustee or their  agents or counsel,  upon the written  request of
the  Trustee,  the Escrow  Agent shall  disburse  all  remaining  funds and U.S.
Government  Securities  and permitted Cash  Equivalents  in the Interest  Escrow
Account to the Company and pending  such  disbursement  shall hold such funds or
securities  for the  Company,  except  that no such  disbursement  shall be made
unless the Company has  certified  to the Escrow Agent that all interest due and
payable on the Notes from time to time  outstanding  through and  including  the
fifth Interest Payment Date has been paid to the Holders thereof pursuant to the
Indenture and in accordance  with this Agreement and the Company has indemnified
the Escrow  Agent,  its  officers,  directors,  employees  and  agents,  for any
liability, loss or expense in connection therewith.

         (d)   Acceleration.  Upon the acceleration of the maturity of the Notes
prior to the payment in full of the first five scheduled interest payments,  the
Escrow Agent  shall,  upon the receipt of written  notice from the  Trustee,  as
agent  for the  Trustee,  foreclose  upon the  Collateral  and  shall  apply the
proceeds of such  foreclosure in accordance  with Section 5.06 of the Indenture.
The  Escrow  Agent  shall  be  entitled  to   reimbursement   of  all  expenses,
disbursements  and  advances  incurred  or made by it in  connection  with  such
foreclosure and application of proceeds.

         4.    Escrow Agent. The  Escrow  Agent's  responsibility  and liability
under this Agreement shall be limited as follows:  (i) the Escrow Agent does not
represent, warrant or guaranty to the holders of the Notes from time to time the
performance  of the Company or the Trustee;  (ii) the Escrow Agent shall have no
responsibility  to the Company or the  holders of the Notes or the Trustee  from
time to time as a 



                                Page 154 of 162
<PAGE>

consequence  of  performance or  nonperformance  by the Escrow Agent  hereunder,
except for any gross negligence or willful misconduct of the Escrow Agent; (iii)
the Company  shall remain  solely  responsible  for all aspects of the Company's
business and conduct;  and (iv) the Escrow Agent is not  obligated to supervise,
inspect or inform  the  Company or any third  party of any  matter  referred  to
above.

                  No implied  covenants or  obligations  shall be inferred  from
this Agreement  against the Escrow Agent, nor shall the Escrow Agent be bound by
the provisions of any agreement  beyond the specific terms hereof.  Specifically
and without limiting the foregoing,  the Escrow Agent shall in no event have any
liability in connection  with its investment,  reinvestment  or liquidation,  in
good  faith  and in  accordance  with the  terms  hereof,  of any  funds or U.S.
Government  Securities held by it hereunder,  including,  without limitation any
liability for any delay not resulting from gross negligence or wilful misconduct
in such investment, reinvestment or liquidation, or for any loss of principal or
income incident to any such delay.

                  The Escrow  Agent shall be entitled to rely upon any  judicial
order  or   judgment,   upon  any  written   opinion  of  counsel  or  upon  any
certification,  instruction,  notice,  or other  writing  delivered to it by the
Company or the  Trustee in  compliance  with the  provisions  of this  Agreement
without being required to determine the  authenticity  or the correctness of any
fact stated therein or the propriety or validity of service thereof.  The Escrow
Agent may act in reliance upon any instrument  comporting with the provisions of
this Agreement or signature believed by it to be genuine and may assume that any
person  purporting  to give notice or receipt or advice or make any statement or
execute any  document in  connection  with the  provisions  hereof has been duly
authorized to do so.

                  The Escrow  Agent may act  pursuant to the  written  advice of
counsel  chosen by it with respect to any matter  relating to this Agreement and
(subject  to  Section  4(a)(ii))  shall not be liable  for any  action  taken or
omitted in accordance with such advice.

                  The Escrow  Agent shall not be called upon to advise any party
as to selling or retaining,  or taking or refraining from taking any action with
respect to, any securities or other  property  deposited  hereunder.  The Escrow
Agent shall not be responsible for or incur any liability in connection with the
performance  of any investment  made at the  discretion of the Company,  for any
other loss or gain in the Interest  Escrow  Account,  or for the  sufficiency of
funds in the Interest Escrow Account to cover interest payments on the Notes.

                  In the event the Escrow  Agent in good faith is in doubt as to
what action to take under this  Agreement  with respect to any funds or property
deposited hereunder, the Escrow Agent shall be entitled to refuse to comply with
any and all  claims,  demands  or  instructions  with  respect  to such funds or
property,  and the Escrow Agent shall not be or become liable for its failure or
refusal to comply with conflicting claims,  demands or instructions.  The Escrow
Agent shall be entitled to refuse to act until either any conflicting or adverse
claims or demands  shall have been  finally  determined  by a court of competent
jurisdiction  or  settled  by  agreement   between  the  conflicting   claimants
(including the Company)  directing the payment or delivery of funds or property.
The  Escrow  Agent  may in  addition  elect in its sole  option to  commence  an
interpleader  action or seek other judicial relief or orders as the Escrow Agent
may deem necessary.

                  No provision of this Agreement  shall require the Escrow Agent
to expend or risk its own funds or otherwise incur any liability .

         5.    Indemnity.  The Company shall indemnify, hold harmless and defend
Escrow Agent and the Trustee, and their respective directors,  officers,  agents
and  employees,  from and  against  any and all  claims,  actions,  obligations,
liabilities and expenses, including defense costs, investigative fees and costs,


                                Page 155 of 162
<PAGE>

legal  fees,  and  claims for  damages,  arising  from  Escrow  Agent's  and the
Trustee's respective performance under this Agreement, except to the extent that
such  liability,  expense  or  claim  is  directly  attributable  to  the  gross
negligence or wilful  misconduct of such indemnified  person. In connection with
any claim, action, obligation, liability or expense for which indemnification is
sought by the Escrow  Agent  hereunder,  the Escrow  Agent  shall be entitled to
recover its costs and expenses as incurred from funds  available in the Interest
Escrow Account.

Grant of Security Interest; Instructions to Escrow Agent.

         (e)   The Company hereby irrevocably grants a first  priority  security
interest in, pledges,  assigns and sets over to the Trustee all of the Company's
right,  title and interest in the Initial  Escrow  Amount,  the Interest  Escrow
Account, all funds held therein and all U.S. Government Securities and permitted
Cash Equivalents and replacements  thereof and proceeds of each of the foregoing
held by or on behalf of the Escrow Agent including,  without limitation,  any of
the foregoing which is a certificated  or  uncertificated  security,  a security
entitlement,  a securities account,  investment  property,  a financial asset, a
Treasury security (including any Treasury STRIPS (Separate Trading of Registered
Interest and  Principal of  Securities)  (collectively,  the  "Collateral"),  to
secure all obligations  and  indebtedness of the Company under the Notes and any
other obligation now or hereafter arising, of every kind and nature, owed by the
Company under the Indenture to the Holders of the Notes or the Trustee.

         (f)   The  Company  and  the Trustee hereby  irrevocably  instruct  the
Escrow Agent to and the Escrow Agent will:  (i)(A)  maintain  sole and exclusive
possession,  dominion and control over funds in the Interest  Escrow Account for
the benefit of the  Trustee for the ratable  benefit of the holders of the Notes
as  required  herein  and (B) take all  applicable  steps set  forth in  Section
2(d)(i) and 2(d)(ii);  (ii) maintain all of the Collateral free and clear of all
liens,  security  interests,  safekeeping or other  charges,  demands and claims
against  Escrow Agent of any nature  whatsoever  now or hereafter  existing,  in
favor of anyone  other than the Escrow  Agent and the  Trustee;  (iii)  promptly
notify the Trustee if Escrow Agent  becomes aware that any person other than the
Trustee  has a lien or  security  interest  upon any  portion of the  Collateral
(other than any claim which Escrow  Agent may have  against the Interest  Escrow
Account for unpaid fees and expenses);  and (iv) immediately  disburse all funds
held in the Interest  Escrow  Account to the Trustee and  transfer  title to all
U.S.  Government  Securities  held by Escrow Agent hereunder to the Trustee upon
written  notice by the Trustee to Escrow  Agent  (without  any consent  from the
Company)  that as a result  of an Event of  Default  under  the  Indenture,  the
indebtedness  represented by the Notes has been  accelerated  and has become due
and payable.

         (g)   Any money and U.S. Government Securities collected by the Trustee
pursuant to Section  6(b)(iii) of the Indenture  shall be applied as provided in
Section 5.06 of the Indenture.

         (h)   Upon  demand, the Company will execute and deliver to the Trustee
such  instruments  and documents as the Trustee may reasonably deem necessary or
advisable to confirm or perfect the rights of the Trustee  under this  Agreement
and the Trustee's interest in the Collateral.

         (i)   The Company  hereby appoints the Trustee as its  attorney-in-fact
effective  upon and during the  continuance  of a Default or an Event of Default
under the  Indenture  with full  power of  substitution  to do any act which the
Company is obligated  hereunder to do, and the Trustee may exercise  such rights
as the Company might exercise with respect to the Collateral and take any action
in the Company's name to protect the Trustee's security interest hereunder.

         6.    Termination. This Agreement shall terminate automatically ten(10)
days  following  disbursement  of all funds  remaining  in the  Interest  Escrow
Account  (including  the  proceeds of any U.S.  Government  Securities),  unless
sooner  terminated by agreement of the parties  hereto (in  accordance  with 



                                Page 156 of 162
<PAGE>

the terms hereof, not in violation of the Indenture),  provided,  however,  that
the  obligations of the Company under Section 5 of this Agreement  shall survive
termination of this Agreement or the resignation or removal of the Escrow Agent;
provided,  further,  however,  that until such tenth day, this Agreement (or any
permitted  successor  agreement)  will remain in effect and the Company will use
its reasonable best efforts to cause there to be an escrow agent  (including any
permitted  successor  thereto)  acting  hereunder  (or under any such  permitted
successor agreement).

         7.    Miscellaneous.

         (j)   Waiver.  Any  party  hereto  may specifically waive any breach of
this  Agreement by any other  party,  but no such waiver shall be deemed to have
been given  unless such waiver is in  writing,  signed by the waiving  party and
specifically designating the breach waived, nor shall any such waiver constitute
a continuing waiver of similar or other breaches.

         (k)   Invalidity.   If,  for any reason whatsoever,  any one or more of
the  provisions  of this  Agreement  shall be held or deemed to be  inoperative,
unenforceable   or  invalid  in  a  particular  case  or  in  all  cases,   such
circumstances shall not have the effect of rendering any of the other provisions
of this Agreement  inoperative,  unenforceable or invalid,  and the inoperative,
unenforceable  or invalid  provision shall be construed as if it were written so
as to effectuate, to the maximum extent possible, the parties' intent.

         (l)   Assignment.   This Agreement is  personal  to the parties hereto,
and the rights and duties of any party hereunder shall not be assignable  except
with the prior written consent of the other parties,  provided however, that the
Escrow  Agent  may , in  accordance  with the  terms  of  Agreement,  appoint  a
Subcustodian  hereunder.  In any event,  this  Agreement  shall  inure to and be
binding upon the parties and their successors and permitted assigns.

         (m)   Benefit.  The parties  hereto, the holders of the Notes and their
permitted  assigns,  but no others,  shall be bound  hereby and  entitled to the
benefits hereof.

         (n)   Time. Time is of the essence in each provision of this Agreement 
of which time is an element.

         (o)   Choice of Law. The existence, validity,  construction,  operation
and effect of any and all terms and provisions of this Agreement  (including the
security interest created hereby and perfection  thereof) shall be determined in
accordance  with and  governed  by the laws of the  State of New  York,  without
giving effect to conflict of law principles thereof.

         (p)   Entire Agreement;  Amendments. This Agreement contains the entire
agreement  among the  parties  with  respect to the  subject  matter  hereof and
supersedes any and all prior agreements, understandings and commitments, whether
oral or written.  This Agreement may be amended only by a writing signed by duly
authorized representatives of all parties.

         (q)   Notices.   All  notices  and  other  communications  required  or
permitted to be given or made under this Agreement shall be in writing and shall
be deemed to have been duly given and  received,  regardless of when and whether
received,  either:  (a) on the day of hand  delivery;  (b) three  business  days
following the day sent, when sent by United States  certified mail,  postage and
certification fee prepaid,  return receipt  requested,  or (c) the next business
day  following  the day timely  delivered to a recognized  next-day air courier,
addressed as follows:

                  To Escrow Agent:

                                Page 157 of 162
<PAGE>


                  Wilmington Trust Company
                  1100 North Market Street
                  Wilmington, DE 19890-0001
                  Attention: Corporate Trust Administration

                  To the Trustee:

                  Wilmington Trust Company
                  1100 North Market Street
                  Wilmington, DE 19890-0001
                  Attention: Corporate Trust Administration



                  To the Company:

                  PSINet Inc.
                  510 Huntmar Park Drive
                  Herndon, Virginia 20170-5100
                  Attention:  Chief Financial Officer

                  with a copy to:

                  Nixon, Hargrave, Devans & Doyle LLP
                  437 Madison Avenue
                  New York, NY 10022
                  Attention: Richard F. Langan, Jr., Esq.

or at such  other  address  as the  specified  entity  most  recently  may  have
designated in writing in accordance  with this section to the others;  or (d) by
facsimile  transmission to the Escrow Agent at (302) 651-8882, to the Trustee at
(302) 651-8882, and to the Company at (703) 397-5396 and (703) 397-5349.

         (r)   Counterparts.  This Agreement  may be  executed  in  one or  more
counterparts,  each of  which  shall  be  deemed  an  original  but all of which
together shall constitute one and the same instrument.

         (s)   Captions. Captions in this Agreement are for convenience only and
shall not be considered or referred to in resolving  questions of interpretation
of this Agreement.

         (t)   Authority of  the  Company;  Valid  and  Binding  Agreement.  The
Company  hereby  represents  and  warrants  that  this  Agreement  has been duly
authorized,  executed  and  delivered on its behalf and  constitutes  the legal,
valid and  binding  obligation  of the  Company.  The  execution,  delivery  and
performance of this Agreement by the Company does not violate any applicable law
or  regulation  to which the Company is subject and does not require the consent
of any  governmental  or other  regulatory body to which the Company is subject,
except for such  consents and  approvals  as have been  obtained and are in full
force and effect.

         (u)   Authority of the Escrow  Agent and the Trustee; Valid and Binding
Agreement.  Each of the  Escrow  Agent and the  Trustee  hereby  represents  and
warrants and this Agreement has been duly authorized,  executed and delivered on
its behalf and constitutes its legal, valid and binding obligation.


                                Page 158 of 162
<PAGE>


                                             [SIGNATURE PAGE FOLLOWS]



                                Page 159 of 162
<PAGE>




                  IN WITNESS  WHEREOF,  the parties have  executed and delivered
this Interest Escrow Agreement as of the date first above written.


ESCROW AGENT:     WILMINGTON TRUST COMPANY


                                             By:  /s/ Thomas P. Laskarsis
                                                 Name:  Thomas P. Laskarsis
                                                 Title: Vice President


TRUSTEE: WILMINGTON TRUST COMPANY


                                             By:  /s/ Thomas P. Laskarsis
                                                 Name:  Thomas P. Laskarsis
                                                 Title: Vice President


COMPANY: PSINET INC.

                                             By:  /s/ Edward D. Postal
                                                 Name:  Edward D. Postal
                                                 Title: Senior Vice President
                                                     and Chief Financial Officer




                                Page 160 of 162
<PAGE>






                                    Exhibit A
                 Form of Payment Notice and Disbursement Request

                           [Letterhead of the Trustee]
                                     [Date]
Wilmington Trust Company
1100 North Market Street
Wilmington, DE 19890-0001
Attention: Corporate Trust Administration

         Re:  Disbursement Request No. ___
               [indicate whether revised]

Ladies and Gentlemen:

                  We refer to the Interest Escrow Agreement ("Escrow Agreement")
dated as of April 13, 1998 by and among Wilmington Trust Company, as Trustee and
Escrow Agent, and PSINET Inc., a New York  corporation  (the "Company").  Unless
otherwise specified,  capitalized terms used herein shall have the meaning given
in the Escrow Agreement.

                  This  letter  constitutes  a Payment  Notice and  Disbursement
Request under the Escrow Agreement.

                  [Choose one of the following, as applicable]

                  [The undersigned hereby notifies you that a scheduled interest
payment in the amount of  $_________  will become due on  ___________,  ____ and
requests a  disbursement  of funds  contained in the Interest  Escrow Account in
such amount to the Holders of the Notes  pursuant to Section  3(a) of the Escrow
Agreement.]

                  [The  undersigned  hereby  notifies  you that  Notes  equaling
$_________ in aggregate principal amount have been retired and authorizes you to
release  $________ of funds in the Interest Escrow Account to the Company (to an
account  designated  by the Company in  writing),  which amount  represents  the
amount  permitted to be released in  accordance  with Section 3(b) of the Escrow
Agreement.]

                  [The  undersigned  hereby notifies you that all amounts due on
the Notes up to and  through  _____________  have  been  paid from the  Interest
Escrow  Account  in  accordance  with the  Indenture  (as  defined in the Escrow
Agreement)  and  authorizes  you to release to the Company all  remaining  funds
contained in the Interest Escrow Account.]

                  [In accordance with Section 6(b)(iv) of the Escrow  Agreement,
the  undersigned  hereby notifies you that there has been an acceleration of the
maturity of the Notes.  Accordingly,  you are hereby  requested  to disburse all
remaining  funds  contained in the Interest  Escrow  Account to the Trustee such
that the balance in the Interest Escrow Account is reduced to zero.]

                  In connection with the requested disbursement, the undersigned
hereby notifies you that:

                  1.       [The Notes have not, as a result of an Event of 
                  Default  (as defined in the  Indenture), been accelerated and 
                  become due and payable.]

                                Page 161 of 162
<PAGE>


                  2.       All prior  disbursements  to the Trustee  from the
                  Interest Escrow Account have been applied.

                  3.       [Add wire instructions for payment to Trustee.]

                  The  Escrow  Agent is  entitled  to rely on the  foregoing  in
disbursing funds relating to this Payment Notice and Disbursement Request.


                                    WILMINGTON TRUST COMPANY
                                        as Trustee


                                    By:_________________________________________
                                       Name:
                                       Title:



                                Page 162 of 162


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