Document:

A/B EXCHANGE

                          REGISTRATION RIGHTS AGREEMENT

                           Dated as of April 26, 2000
                                  by and among

                                360networks inc.

               Donaldson, Lufkin & Jenrette Securities Corporation

                              Goldman, Sachs & Co.

                            Bear, Stearns & Co. Inc.

                              Chase Securities Inc.

                     Credit Suisse First Boston Corporation

                        Morgan Stanley & Co. Incorporated

                            Salomon Smith Barney Inc.

                       RBC Dominion Securities Corporation

                            TD Securities (USA) Inc.

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     This Registration Rights Agreement (this "Agreement") is made and entered
into as of April 26, 2000, by and among 360networks inc., a corporation
continued under the laws of Nova Scotia, Canada (the "Company") and Donaldson,
Lufkin & Jenrette Securities Corporation, Goldman, Sachs & Co., Bear, Sterns &
Co. Inc., Chase Securities Inc., Credit Suisse First Boston Corporation, Morgan
Stanley & Co. Incorporated, Salomon Smith Barney Inc., RBC Dominion Securities
Corporation and TD Securities (USA) Inc. (each, an "Initial Purchaser" and,
together, the "Initial Purchasers"), each of whom has agreed to purchase the
Company's US$ 13% Series A Senior Notes due 2008 (the "Series A Dollar Notes"),
pursuant to the Purchase Agreement (as defined below).

     This Agreement is made pursuant to the Purchase Agreement, dated April 20,
2000 (the "Purchase Agreement"), by and among the Company and the Initial
Purchasers. In order to induce the Initial Purchasers to purchase the Series A
Dollar 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 in the Indenture, dated April 26, 2000,
between the Company and HSBC Bank USA, as Trustee, relating to the Series A
Dollar Notes and the Series B Dollar Notes (the "Indenture").

     The parties hereby agree as follows:

1    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 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: Any day except a Saturday, Sunday or other day on which banks
are authorized to close in (a) the City of New York or (b) the city of the
corporate trust office of the Trustee.

     Certificated Securities: Definitive Notes, as defined in the Indenture.

     Closing Date: The date hereof.

     Commission: The Securities and Exchange Commission.

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     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 Series B Dollar
Notes to be issued in the Exchange Offer as evidence of the same underlying
indebtedness as the Series A Dollar Notes, (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 Series B Dollar Notes in the same aggregate principal amount,
and as evidence of the same underlying indebtedness, as the aggregate principal
amount of Series A Dollar Notes tendered by Holders thereof pursuant to the
Exchange Offer.

     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 Offer: The exchange and issuance by the Company of a principal
amount of Series B Dollar Notes (which shall be registered pursuant to the
Exchange Offer Registration Statement) equal to the outstanding principal amount
of Series A Dollar Notes, and as evidence of the same underlying indebtedness,
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
sell the Series A Dollar 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: An individual, partnership, corporation, trust, unincorporated
organization or a government or agency or political subdivision thereof.

     Predecessor Division: The telecommunications division of Ledcor Inc.

     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
Prospectus.

     Recommencement Date: As defined in Section 6(d) hereof.

     Registration Default: As defined in Section 5 hereof.

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     Registration Statement: Any registration statement of the Company relating
to (a) an offering of Series B Dollar Notes pursuant to an 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.

     Rule 144: Rule 144 promulgated under the Act.

     Series B Dollar Notes: The Company's US$ 13% Series B Senior Notes due 2008
containing terms identical in all material respects to the Series A Dollar
Notes, and evidencing the same underlying indebtedness thereof, (except that (a)
interest thereon shall accrue from the last date on which interest was paid on
the Series A Dollar Notes or, if no such interest has been paid, from the date
of their original issue and (b) the transfer restrictions thereon shall be
eliminated to be issued pursuant to the Indenture: (i) in the Exchange Offer or
(ii) as contemplated by Section 4 hereof.

     Shelf Registration Statement: As defined in Section 4 hereof.

     Suspension Notice: As defined in Section 6(d) hereof.

     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 (A) Series A Dollar Note, until the
earliest to occur of (i) the date on which such Series A Dollar Note is
exchanged in the Exchange Offer for a Series B Dollar Note, representing the
same underlying indebtedness as the Series A Dollar Note which is entitled to be
resold to the public by the Holder thereof without complying with the prospectus
delivery requirements of the Act, (ii) the date on which such Series A Dollar
Note has been disposed of in accordance with a Shelf Registration Statement (and
the purchasers thereof have been issued Series B Dollar Notes as evidence of the
same underlying indebtedness), (iii) the date on which such Series A Dollar 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) or (iv) the date on which such
Series A Dollar Note is distributed to the public pursuant to Rule 144 under the
Act.

2    HOLDERS

     A Person is deemed to be a holder of Transfer Restricted Securities (each,
a "Holder") whenever such Person owns Transfer Restricted Securities.

3    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

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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 90 days
after the Closing Date (such 90th day being the "Filing Deadline"), (ii) use its
reasonable best efforts to cause such Exchange Offer Registration Statement to
become effective at the earliest possible time, but in no event later than 180
days after the Closing Date (such 180th 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 Series B Dollar 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 Series
B Dollar Notes to be offered in exchange for the Series A Dollar Notes that are
Transfer Restricted Securities, as evidence of the same underlying indebtedness,
and (ii) resales of Series B Dollar Notes by Broker-Dealers that tendered into
the Exchange Offer Series A Dollar Notes that such Broker-Dealer acquired for
its own account as a result of market making activities or other trading
activities (other than Series A Dollar Notes acquired directly from the Company
or any of its Affiliates) as contemplated by Section 3(c) below.

     (b) The Company shall use its reasonable 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
Series B Dollar Notes shall be included in the Exchange Offer Registration
Statement. The Company shall use its reasonable best efforts to cause the
Exchange Offer to be Consummated on the earliest practicable date after the
Exchange Offer Registration Statement has become effective, but in no event
later than 210 days after the Closing Date (such 210th 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 Series A Dollar Notes
acquired directly from the Company or any Affiliate of the Company), may
exchange such Transfer Restricted Securities pursuant to the Exchange Offer.
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.

     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 Series B
Dollar Notes received by such Broker-Dealer in the Exchange

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Offer, as evidence of the same underlying indebtedness as the Series A Dollar
Notes, 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 Series B Dollar Notes by Broker-Dealers, the Company agrees to use
its reasonable best efforts to keep the Exchange Offer Registration Statement
continuously effective, supplemented, amended and current as required by and
subject to the provisions of Sections 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 (excluding any Exchange Offer Blackout Period (as defined)) 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; provided, further, that the Company may suspend the
effectiveness of the Exchange Offer Registration Statement, in the event that,
and for up to 2 periods of up to 30 consecutive days, but no more than an
aggregate of 45 consecutive days (an "Exchange Offer Blackout Period") if,
(a)(i) an event occurs and is continuing as a result of which the Exchange Offer
Registration Statement would, in the Company's good faith judgment, contain an
untrue statement of a material fact or omit to state a material fact necessary
in order to make the statements therein not misleading and (ii) if the Company
determines in good faith that the disclosure of such event at such time would
have a material adverse effect on the business operations or prospectus of the
Company or (b) the disclosure otherwise relates to a pending material business
transaction which has not yet been publicly disclosed; provided, further, that
the Company shall continue to pay Additional Interest, if any, during the
Exchange Offer Blackout Period. Upon the occurrence of any such suspension, the
Company will use its best efforts to reinstate effectiveness of such Exchange
Offer Registration Statement as soon as practicable. 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 one day after
such request, at any time during such period.

4    SHELF REGISTRATION

     (a) Shelf Registration. If (i) the Exchange Offer is not permitted by
applicable law or Commission Policy (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 of the Exchange Offer 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 Series B Dollar Notes acquired by it in the Exchange
Offer as evidence of the same underlying indebtedness as the Series A Dollar
Notes 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 (C) such Holder is a Broker-Dealer and holds
Series A Dollar 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 and (ii) the date
on which the Company receives the notice specified in clause (a)(ii) above, (but
no earlier than 90 days after the Closing Date) (such earlier date, which shall
not

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be earlier than 90 days after the Closing 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, and

     (y) shall use its reasonable best efforts to cause such Shelf Registration
Statement to become effective on or prior to 90 days after the Filing Deadline
for the Shelf Registration Statement (but no earlier than 210 days after the
Closing Date) (such day being 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).

     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 reasonable 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 as long as any Initial Purchaser is deemed to be an Affiliate of the
Company, but in no event less than the shorter of (i) two years (excluding any
Shelf Blackout period (as defined)) (as extended pursuant to Section 6(d))
following the Closing Date or (ii) the date on which all Transfer Restricted
Securities covered by such Shelf Registration Statement have been sold pursuant
thereto; provided, further, that the Company may suspend the effectiveness of a
Shelf Registration Statement, in the event that, and for up to three periods of
up to 45 consecutive days, but no more than an aggregate of 90 days during any
365 day period (a "Shelf Blackout Period") if, (a)(i) an event occurs and is
continuing as a result of which the Shelf Registration Statement would, in the
Company's good faith judgment, contain an untrue statement of a material fact or
omit to state a material fact necessary in order to make the statements therein
not misleading and (ii) if the Company determines in good faith that the
disclosure of such event at such time would have a material adverse effect on
the business, operations or prospects of the Company or (b) the disclosure
otherwise relates to a pending material business transaction which has not yet
been publicly disclosed; provided, however, that the Company shall not pay
Additional Interest, during any such Shelf Blackout Period. Upon the occurrence
of any such suspension, the Company will use its reasonable best efforts to
reinstate effectiveness of such Shelf Registration Statement as soon as
practicable.

     (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 20 days after receipt of a request therefor, the
information specified in Item 507 or 508 of Regulation S-K, as applicable, of
the Act

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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 additional interest pursuant to Section 5 hereof
unless and until such Holder shall have provided all such information. Each
selling Holder agrees to promptly furnish additional information required to be
disclosed in order to make the information previously furnished to the Company
by such Holder not materially misleading.

5    additional interest

     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 within two days by a post-effective
amendment to such Registration Statement that cures such failure and that is
itself declared effective (within five days of filing such post-effective
amendment to such Registration Statement) (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
additional interest ("Additional Interest") which will accrue and be payable at
the time interest is due on the Series A Dollar Notes and the Series B Dollar
Notes (in addition to the stated interest on the Series A Dollar Notes and the
Series B Dollar Notes) from and including the date such Registration Default
occurs to, but not including, the date on which the applicable Registration
Statement is filed or is declared effective, the Exchange Offer is consummated,
or the applicable Registration Statement is again declared effective or made
usable. During the time that Additional Interest is accruing continuously, the
rate of such Additional Interest shall be 0.50% per annum during the first
90-day period and shall increase by 0.25% per annum for each subsequent 90-day
period, but in no event shall such rate exceed 1.50% per annum in the aggregate
regardless of the number of Registration Defaults. If, after the cure of all
Registration Defaults then in effect, there is a subsequent Registration
Default, the rate of Additional Interest for such subsequent Registration
Default shall initially be 0.50%, regardless of the Additional Interest rate in
effect with respect to any prior Registration Default at the time of the cure of
such Registration Default.

     All accrued Additional Interest shall be paid by the Company to the Holders
entitled thereto in the same manner and on the same date as interest payments on
the Notes, as more fully described in the Indenture. Notwithstanding the fact
that any securities for which Additional Interest are due cease to be Transfer
Restricted Securities, all obligations of the Company to pay Additional Interest
with respect thereto shall survive until such time as such obligations with
respect to such securities shall have been satisfied in full.

6    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 reasonable best efforts to effect such exchange and to
permit the resale of Series B Dollar Notes by

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Broker-Dealers that tendered in the Exchange Offer Series A Dollar Notes that
such Broker-Dealer acquired for its own account as a result of its market making
activities or other trading activities (other than Series A Dollar 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
     (unless in the reasonable opinion of counsel to the Company, the filing of
     such no-action letter is not appropriate). The Company hereby agrees to
     pursue the issuance of such a decision to the Commission staff level. In
     connection with the foregoing, the Company hereby agrees to take all such
     other actions as may be requested by the Commission or otherwise required
     in connection with the issuance of such decision.

          (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
     Series B Dollar Notes to be issued in the Exchange Offer and (C) it is
     acquiring the Series B Dollar Notes in its ordinary course of business. As
     a condition to its participation in the Exchange Offer each Holder using
     the Exchange Offer to participate in a distribution of the Series B Dollar
     Notes shall acknowledge and agree that, if the resales are of Series B
     Dollar Notes obtained by such Holder in exchange for, and as evidence of
     the same underlying indebtedness as, Series A Dollar 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.

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          (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 Series B Dollar Notes to be
     received in the Exchange Offer and that, to the best of the Company's
     information and belief, each Holder participating in the Exchange Offer is
     acquiring the Series B Dollar Notes in its ordinary course of business and
     has no arrangement or understanding with any Person to participate in the
     distribution of the Series B Dollar 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:

          (ii) comply with all the provisions of Section 6(c) below and use its
     reasonable 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

          (iii) issue, upon the request of any Holder or purchaser of Series A
     Dollar Notes covered by any Shelf Registration Statement contemplated by
     this Agreement, Series B Dollar Notes having an aggregate principal amount
     equal to, and representing the same underlying indebtedness as, the
     aggregate principal amount of Series A Dollar Notes sold pursuant to the
     Shelf Registration Statement and surrendered to the Company for
     cancellation; the Company shall register Series B Dollar Notes on the Shelf
     Registration Statement for this purpose and issue the Series B Dollar Notes
     to the purchasers of securities subject to the Shelf Registration Statement
     in the names as such purchasers shall designate.

     (c) General Provisions. In connection with any Registration Statement and
any related Prospectus required by this Agreement, the Company shall:

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          (i) use its reasonable 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 reasonable 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
     supplement, and as so supplemented to be filed pursuant to Rule 424 under
     the Act, and to comply fully with 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 selling 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 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, and (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

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     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 reasonable best efforts to obtain the withdrawal or lifting of such
     order at the earliest possible 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 selling Holder and each Affiliated Market Maker,
     in connection with such 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 Persons 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 such
     Persons shall reasonably object within five Business Days after the receipt
     thereof. Such Person 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 omit to state any material fact necessary to make the
     statements therein not misleading or fails to comply with the applicable
     requirements of the Act;

          (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 selling Holder and each Affiliated
     Market Maker in connection with such sale, if any, make the Company's
     representatives available 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 Persons may reasonably
     request; 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 (a) disclosure of such information is required by court or
     administrative order or is necessary to respond to inquiries of regulatory
     authorities, (b) 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
     such Prospectus), (c) such information becomes generally available to

                                       11
<PAGE>

     the public other than as a result of a disclosure or failure to safeguard
     such information by such Person or (d) such information becomes available
     to such Persons 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;

          (vii) make available, at reasonable times, for inspection by each
     selling Holder and each Affiliated Market Maker and any attorney or
     accountant retained by such Persons, 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 in writing by any such Person, 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;

          (viii) if requested by any selling Holders in connection with such
     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 Persons may reasonably
     request in writing to have included therein, including, without limitation,
     information relating to the "Plan of Distribution" of the Transfer
     Restricted Securities, 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;

          (ix) furnish to each selling Holder in connection with such 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 selling 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 Person 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 and take all such other actions in connection therewith in order
     to expedite or

                                       12
<PAGE>

     facilitate the disposition of the Transfer Restricted Securities pursuant
     to any applicable Registration Statement contemplated by this Agreement as
     may be reasonably requested in writing 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:

               (A) upon written request of any selling Holder or any Affiliated
          Market Maker, furnish (or in the case of paragraphs (2) and (3), use
          its reasonable best efforts to cause to be furnished) to each Person,
          upon Consummation of the Exchange Offer or upon the effectiveness of
          the Shelf Registration Statement, as the case may be:

                    (1) 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(z), 9(a) and 9(b) of the Purchase Agreement and such
               other similar matters as such Persons may reasonably request;

                    (2) 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 Section
               9(e) of the Purchase Agreement and such other matters as such
               Holder may reasonably request, and including, without limitation,
               the paragraph relating to Section 10b-5 under the Exchange Act;
               and

                    (3) On the date of Consummation of the Exchange Offer or the
               date of effectiveness of the Shelf Registration Statement, as
               applicable, customary comfort letters, 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 independent accountants of the Company and the
               Predecessor Division, 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(j) of the Purchase Agreement; and

               (B) deliver such other documents and certificates as may be
          reasonably requested in writing by the such Persons to evidence
          compliance with the matters covered in clause (A) above and with any
          customary conditions contained in any 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

                                       13
<PAGE>

     reasonably request in writing 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 in writing at least two Business Days prior to
     such sale of Transfer Restricted Securities;

          (xiv) use its reasonable 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 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) 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

                                       14
<PAGE>

          (xviii) provide promptly to each Holder and each 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, unless
     already provided.

     (d) Restrictions on Holders. Each Holder and each Affiliated Market Maker
agrees by acquisition of a Transfer Restricted Security 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 Person will forthwith discontinue
disposition of Transfer Restricted Securities pursuant to the applicable
Registration Statement until (i) such Person has received copies of the
supplemented or amended Prospectus contemplated by Section 6(c)(iv) hereof, or
(ii) such 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 Person receiving a Suspension Notice
hereby agrees that it will either (i) destroy any Prospectuses, other than
permanent file copies, then in such 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 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.

7    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 Blue Sky or securities laws of any states
or relevant foreign jurisdictions; (iii) all expenses of printing (including
printing certificates for the Series B Dollar Notes to be issued in the Exchange
Offer, as evidence of the same underlying indebtedness as the Series A Dollar
Notes, and printing of 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; (v) all application and filing fees in
connection with listing the Series B Dollar 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 and the Predecessor Division (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.

                                       15
<PAGE>

     Each Holder shall pay all underwriting discounts and commissions and
transfer taxes, if any, relating to the sale or disposition of such Holder's
Transfer Restricted Securities.

     (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 Series A Dollar Notes in the Exchange Offer and/or selling or
reselling Series A Dollar Notes or Series B Dollar 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 with respect to matters of U.S. law
and one counsel with respect to matters of Canadian law, who shall be Latham &
Watkins and Osler, Hoskin & Harcourt LLP, respectively, 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.

8    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, 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 Series B Dollar Notes or registered Series A
Dollar 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 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;
provided, however, that the foregoing indemnity agreement with respect to any
preliminary prospectus, shall not inure to the benefit of any such person who
failed to deliver a Prospectus (so long as the Prospectus was provided by the
Company to such person in the requisite quantity and on a timely basis to permit
proper delivery) to the person asserting any losses, claims, damages,
liabilities or judgments caused by any untrue statement or alleged untrue
statement of a material fact contained in the preliminary prospectus, 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, if
such material misstatement or omission or alleged material misstatement or
omission was cured in the Prospectus.

     (b) Each Holder of Transfer Restricted Securities 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 8(a) above, but
only with reference to information relating to such Holder furnished in writing
to the Company by such Holder expressly for use in any Registration Statement.
In no event shall any

                                       16
<PAGE>

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.

     (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 with respect to matters of U.S. law and
one separate firm of attorneys with respect to matters of Canadian law (in each
case, 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 twenty 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

                                       17
<PAGE>

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.

     (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
information supplied by the Company, on the one hand, or by the Holder, on the
other hand, 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 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, including any action
that could have given rise to such losses, claims, damages, liabilities or
judgments. 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 received by such Holder with respect to the sale of its Transfer
Restricted Securities pursuant to a Registration Statement exceeds the sum of
(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. 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

                                       18
<PAGE>

pursuant to this Section 8(d) are several in proportion to the respective
principal amount of Transfer Restricted Securities held by each Holder hereunder
and not joint.

     (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.

9    RULE 144A and RULE 144

     For so long as any Notes remain outstanding, the Company shall furnish to
the Holders the information required to be delivered pursuant to Rule 144A(d)(4)
under the Securities Act. Whether or not the Company is subject to Section 13(a)
or 15(d) of the Exchange Act, the Company shall file with the SEC and furnish to
the Holders and the Trustee (i) within 140 days after the end of each fiscal
year, annual reports on Form 20-F or 40-F, as applicable (or any successor
form), containing the information required to be contained therein (or required
in such successor form) and (ii) (a) within 45 days after the end of each of the
first three fiscal quarters of each fiscal year, reports on Form 10-Q or (b)
within 60 days after the end of each of the first three fiscal quarters of each
fiscal year, reports on Form 6-K (or any successor form) which, regardless of
applicable requirements, shall, at a minimum, contain a "Management's Discussion
and Analysis of Financial Condition and Results of Operations."

10   submission to jurisdiction; appointment of agent for service

     To the fullest extent permitted by applicable law, the Company irrevocably
submits to the jurisdiction of any federal or state court the Borough of
Manhattan in the City, County and State of New York, United States of America,
in any suit or proceeding based on or arising under this Agreement (solely in
connection with any such suit or proceeding), and irrevocably agrees that all
claims in respect of such suit or proceeding may be determined in any such
court. The Company irrevocably and fully waives the defense of an inconvenient
forum to the maintenance of such suit or proceeding. The Company agrees that
final judgment in any such suit, action or proceeding brought in such a court
shall be conclusive and binding upon the Company and may be enforced in the
courts of Canada (or any other courts to the jurisdiction of which the Company
is subject) by a suit upon such judgment, provided that service of process is
effected upon the Company in the manner specified herein. The Company hereby
irrevocably designates and appoints CT Corporation System (the "Process Agent"),
as the authorized agent of the Company upon whom process may be served in any
such suit or proceeding, it being understood that the designation and
appointment of CT Corporation System as such authorized agent shall become
effective immediately without any further action on the part of the Company. The
Company represents to the Initial Purchasers that it has notified the Process
Agent of such designation and appointment and that the Process Agent has
accepted the same in writing. The Company hereby irrevocably authorizes and
directs the Process Agent to accept such service. The Company further agrees
that, to the extent permitted by law, service of process upon the Process Agent
and written notice of said service to the Company mailed by prepaid registered
first class mail at its address specified in Section 12 of this Agreement, shall
be deemed in every respect effective service of process upon the Company in any
such suit or proceeding. Nothing herein shall affect the right of any Initial

                                       19
<PAGE>

Purchaser or Affiliated Market Maker or any person controlling such Initial
Purchaser or Affiliated Market Maker or any Indemnified Holder to serve process
in any other manner permitted by law. The Company further agrees to take any and
all action, including the execution and filing of any and all such documents and
instruments as may be necessary to continue such designation and appointment of
the Process Agent in full force and effect so long as the Company has any
outstanding obligations under this Agreement. To the extent that the Company has
or hereafter may acquire any immunity from jurisdiction of any court or from any
legal process (whether through service of note, attachment prior to judgment,
attachment in aid of execution, executor or otherwise) with respect to itself or
its property, the Company hereby irrevocably waives such immunity in respect of
their obligations under this Agreement, to the extent permitted by law.

     The provisions of this Section 10 shall survive any termination of this
Agreement, in whole or in part.

11   obligation currency

     The obligation of the parties to make payments hereunder is in U.S. dollars
(the "Obligation Currency") and such obligation shall not be discharged or
satisfied by any tender or recovery pursuant to any judgment expressed in or
converted into any currency other than the Obligation Currency or any other
realization in such other currency, whether as proceeds of set-off, security,
guarantee, distributions, or otherwise, except to the extent to which such
tender, recovery or realization shall result in the effective receipt by the
party which is to receive such payment of the full amount of the Obligation
Currency expressed to be payable hereunder, and the party liable to make such
payment agrees to indemnify the party which is to receive such payment (as an
additional, separate and independent cause of action) for the amount (if any) by
which such effective receipt shall fall short of the full amount of the
Obligation Currency expressed to be payable hereunder and such obligation to
indemnify shall not be affected by judgment being obtained for any other sums
due under this Agreement.

12   MISCELLANEOUS

     (a) Remedies. The Company acknowledges and agrees that any failure by the
Company 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 Maker 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 for the rights granted
pursuant to the Registration Rights Agreement dated December 23, 1998, among the
Company, Donaldson, Lufkin & Jenrette Securities Corporation and TD Securities
(USA) Inc., the Registration Rights Agreement dated July 28, 1999, among the
Company,

                                       20
<PAGE>

Donaldson, Lufkin & Jenrette Securities Corporation, Morgan Stanley & Co.
Incorporated, Salomon Smith Barney Inc. and TD Securities (USA) Inc. and the
Euro Registration Rights Agreement dated April 28, 2000, among the Company and
the initial purchasers listed thereto, the Company has not previously entered
into any agreement granting any registration rights with respect to its
securities to any Person. The rights granted to the Holders hereunder do not in
any way conflict with and are not inconsistent 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.

     (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:

               360networks inc.
               1510-1066 West Hastings Street
               Vancouver, BC Canada V6E 3X1
               Telecopier No.:  (604) 681-6822
               Attention:  Secretary

               with a copy to:

                                       21
<PAGE>

               Cahill Gordon & Reindel
               80 Pine Street
               New York, New York 10005
               Telecopier No.:  (212) 269-5420
               Attention:  Roger Andrus, Esq.

     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 Restricted Securities in any
manner, whether by operation of law or otherwise, such Transfer Restricted
Securities shall be held subject to all of the terms of this Agreement, 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, including the restrictions on resale set
forth in this Agreement and, if applicable, the Purchase Agreement, 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 LAWS OF THE STATE OF NEW YORK, WITHOUT REGARD TO THE
CONFLICT 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,

                                       22
<PAGE>

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.

                                       23
<PAGE>

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

                                   360networks inc.

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

DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION
GOLDMAN, SACHS & CO.
BEAR, STEARNS & CO. INC.
CHASE SECURITIES INC.
CREDIT SUISSE FIRST BOSTON CORPORATION
MORGAN STANLEY & CO. INCORPORATED
SALOMON SMITH BARNEY INC.
RBC DOMINION SECURITIES CORPORATION
TD SECURITIES (USA) INC.

By:  DONALDSON, LUFKIN & JENRETTE SECURITIES CORPORATION,
      as representative of the several underwriters

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

                                       24
<PAGE>

                                    EXHIBIT A

                               NOTICE OF FILING OF
                    A/B 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:    360networks inc.
         __% Senior Dollar Notes due 2008
         __% Senior Dollar Notes due 2010

Date: _____, 2000

     For your information only (NO ACTION REQUIRED):

     Today, ______, 2000, we filed [an A/B 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.

                                      A-1360networks inc.

                                 EURO 200,000,000

                            13% SENIOR NOTES DUE 2008

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

                                    INDENTURE

                           Dated as of April 28, 2000

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

                                 HSBC Bank USA,
                                     Trustee

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

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page

                                    ARTICLE 1

                          DEFINITIONS AND INCORPORATION
                                  BY REFERENCE

Section 1.01.     Definitions.................................................1
Section 1.02.     Other Definitions..........................................23
Section 1.03.     Incorporation by Reference of Trust Indenture Act..........23
Section 1.04.     Rules of Construction......................................24

                                    ARTICLE 2

                                    THE NOTES

Section 2.01.     Form and Dating............................................24
Section 2.02.     Execution and Authentication...............................25
Section 2.03.     Registrar and Paying Agent.................................25
Section 2.04.     Paying Agent to Hold Money in Trust........................26
Section 2.05.     Holder Lists...............................................26
Section 2.06.     Transfer and Exchange......................................26
Section 2.07.     Replacement Notes..........................................37
Section 2.08.     Outstanding Notes..........................................37
Section 2.09.     Treasury Notes.............................................38
Section 2.10.     Temporary Notes............................................38
Section 2.11.     Cancellation...............................................38
Section 2.12.     Defaulted Interest.........................................38

                                    ARTICLE 3

                            REDEMPTION AND PREPAYMENT

Section 3.01.     Notices to Trustee.........................................39
Section 3.02.     Selection of Notes to Be Redeemed..........................39
Section 3.03.     Notice of Redemption.......................................39
Section 3.04.     Effect of Notice of Redemption.............................40
Section 3.05.     Deposit of Redemption Price................................40
Section 3.06.     Notes Redeemed in Part.....................................40
Section 3.07.     Optional Redemption........................................40
Section 3.08.     Mandatory Redemption.......................................41
Section 3.09.     Offer to Purchase by Application of Excess Proceeds........41

                                      -i-
<PAGE>
                                                                            Page
                                    ARTICLE 4

                                    COVENANTS

Section 4.01.     Payment of Notes...........................................42
Section 4.02.     Maintenance of Office or Agency............................43
Section 4.03.     Reports....................................................43
Section 4.04.     Compliance Certificate.....................................44
Section 4.05.     Taxes; Payment of Additional Amounts.......................44
Section 4.06.     Stay, Extension and Usury Laws.............................45
Section 4.07.     Restricted Payments........................................45
Section 4.08.     Dividend and Other Payment Restrictions Affecting
                    Subsidiaries.............................................49
Section 4.09.     Incurrence of Indebtedness and Issuance of Preferred
                    Stock....................................................50
Section 4.10.     Limitation on Asset Sales..................................53
Section 4.11.     Transactions with Affiliates...............................54
Section 4.12.     Liens......................................................55
Section 4.13.     Corporate Existence........................................55
Section 4.14.     Repurchase at the Option of Holders upon a Change
                    of Control...............................................56
Section 4.15.     No Senior Subordinated Debt................................57
Section 4.16.     Issuances of Guarantees by Restricted Subsidiaries.........57
Section 4.17.     Designation of Restricted and Unrestricted Subsidiaries....58
Section 4.18.     Payments for Consent.......................................58
Section 4.19.     Business Activities........................................58

                                    ARTICLE 5

                                   SUCCESSORS

Section 5.01.     Amalgamation, Merger, Consolidation, or Sale of Assets.....58
Section 5.02.     Successor Corporation Substituted..........................59

                                    ARTICLE 6

                              DEFAULTS AND REMEDIES

Section 6.01.     Events of Default..........................................60
Section 6.02.     Acceleration...............................................61
Section 6.03.     Other Remedies.............................................62
Section 6.04.     Waiver of Past Defaults....................................62
Section 6.05.     Control by Majority........................................62
Section 6.06.     Limitation on Suits........................................62
Section 6.07.     Rights of Holders of Notes to Receive Payment..............63
Section 6.08.     Collection Suit by Trustee.................................63
Section 6.09.     Trustee May File Proofs of Claim...........................63
Section 6.10.     Priorities.................................................63
Section 6.11.     Undertaking for Costs......................................64
Section 6.12.     Indemnification for Judgment Currency Fluctuations.........64

                                      -ii-
<PAGE>
                                                                            Page
                                    ARTICLE 7

                                     TRUSTEE

Section 7.01.     Duties of Trustee..........................................64
Section 7.02.     Rights of Trustee..........................................65
Section 7.03.     Individual Rights of Trustee...............................66
Section 7.04.     Trustee's Disclaimer.......................................66
Section 7.05.     Notice of Defaults.........................................66
Section 7.06.     Reports by Trustee to Holders of the Notes.................66
Section 7.07.     Compensation and Indemnity.................................67
Section 7.08.     Replacement of Trustee.....................................67
Section 7.09.     Successor Trustee by Merger, etc...........................68
Section 7.10.     Eligibility; Disqualification..............................68
Section 7.11.     Preferential Collection of Claims Against Company..........68

                                    ARTICLE 8

                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01.     Option to Effect Legal Defeasance or Covenant Defeasance...69
Section 8.02.     Legal Defeasance and Discharge.............................69
Section 8.03.     Covenant Defeasance........................................69
Section 8.04.     Conditions to Legal or Covenant Defeasance.................70
Section 8.05.     Deposited Money and Government Securities to be Held in
                    Trust; Other Miscellaneous Provisions....................71
Section 8.06.     Repayment to Company.......................................72
Section 8.07.     Reinstatement..............................................72

                                    ARTICLE 9

                        AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01.     Without Consent of Holders of Notes........................72
Section 9.02.     With Consent of Holders of Notes...........................73
Section 9.03.     Compliance with Trust Indenture Act........................74
Section 9.04.     Revocation and Effect of Consents..........................74
Section 9.05.     Notation on or Exchange of Notes...........................74
Section 9.06.     Trustee to Sign Amendments, etc............................75

                                   ARTICLE 9A

                             SATISFACTION AND WAIVER

Section 9.01A     Satisfaction and Discharge of Indenture....................75
Section 9.02A     Application of Trust Money.................................75

                                     -iii-
<PAGE>
                                                                            Page
                                   ARTICLE 10

                                  MISCELLANEOUS

Section 10.01.    Trust Indenture Act Controls...............................76
Section 10.02.    Notices....................................................76
Section 10.03.    Communication by Holders of Notes with Other Holders
                    of Notes.................................................77
Section 10.04.    Certificate and Opinion as to Conditions Precedent.........77
Section 10.05.    Statements Required in Certificate or Opinion..............77
Section 10.06.    Rules by Trustee and Agents................................78
Section 10.07.    No Personal Liability of Directors, Officers, Employees
                    and Stockholders.........................................78
Section 10.08.    Governing Law..............................................78
Section 10.09.    Jurisdiction...............................................78
Section 10.10.    No Adverse Interpretation of Other Agreements..............79
Section 10.11.    Successors.................................................79
Section 10.12.    Severability...............................................79
Section 10.13.    Counterpart Originals......................................79
Section 10.14.    Table of Contents, Headings, etc...........................79

EXHIBITS

Exhibit A         FORM OF NOTE
Exhibit B         FORM OF CERTIFICATE OF TRANSFER
Exhibit C         FORM OF CERTIFICATE OF EXCHANGE
Exhibit D         FORM OF CERTIFICATE OF ACQUIRING INSTITUTIONAL
                  ACCREDITED INVESTOR

                                      -iv-
<PAGE>

                                                                      EXHIBIT A1

     INDENTURE dated as of April 28, 2000, between 360networks inc., a company
continued under the laws of the Province of Nova Scotia, Canada (the "Company"),
and HSBC Bank USA, as trustee (the "Trustee").

     The Company and the Trustee agree as follows for the benefit of each other
and for the equal and ratable benefit of the Holders of the 13% Senior Notes due
2008 (the "Notes"):

                                    ARTICLE 1

                          DEFINITIONS AND INCORPORATION
                                  BY REFERENCE

Section 1.01. Definitions.

     "144A Global Note" means a global note substantially in the form of Exhibit
A hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of, and registered in the name of, the Depositary or
its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Notes sold in reliance on Rule 144A.

     "1998 Notes" means the Company's 12.5% Senior Notes due 2005.

     "1999 Notes" means the Company's 12% Senior Notes due 2009.

     "Acquired Debt" means, with respect to any specified Person:

     (1) Indebtedness of any other Person existing at the time such other Person
is merged with or into or became a Subsidiary of such specified Person; provided
that such Indebtedness was not incurred in connection with, or in contemplation
of, such other Person merging with or into, or becoming a Subsidiary of, such
specified Person; and

     (2) Indebtedness secured by a Lien encumbering any asset acquired by such
specified Person.

     "Additional Interest" has the meaning set forth in Section 5 of the
Registration Rights Agreement.

     "Adjusted Consolidated Cash Flow" means Consolidated Cash Flow minus all
non-cash items increasing Consolidated Net Income for the applicable period to
the extent not previously deducted in computing Consolidated Cash Flow, whether
or not such non-cash items were accrued or incurred in the ordinary course of
business or otherwise.

     "Adjusted Fiber Value" means, at any time after certain Affiliates of
Ledcor Inc. have contributed dark fiber strands to the Company pursuant to the
Undertaking Agreements, an amount equal to U.S. $72.5 million less one-twelfth
(1/12) of such amount for each of such dark fiber strands which has been sold,
leased, contributed or with respect to which an IRU has been granted to any
Person.

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control,"
as used with respect to any Person, shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management or
policies of such Person, whether through the ownership of voting securities, by
agreement or otherwise; provided that beneficial ownership of 10% or more of the
Voting

<PAGE>

Stock of a Person shall be deemed to be control. For purposes of this
definition, the terms "controlling," "controlled by" and "under common control
with" shall have correlative meanings.

     "Agent" means any Registrar, Paying Agent or co-registrar.

     "Applicable Procedures" means, with respect to any transfer or exchange of
or for beneficial interests in any Global Note, the rules and procedures of the
Depositary, Euroclear and Clearstream that apply to such transfer or exchange.

     "Asset Sale" means:

     (1)  the sale, lease, conveyance or other disposition of any assets or
          rights other than any sale, lease, transfer, conveyance, or other
          disposition of telecommunications capacity, transmission rights, or
          other telecommunications services provided over the Company's network
          in the ordinary course of business; provided that the sale, conveyance
          or other disposition of all or substantially all of the assets of the
          Company and its Restricted Subsidiaries taken as a whole will be
          governed by the provisions of Section 4.14 and/or Section 5.01 and not
          by the provisions of Section 4.10; and

     (2)  the issuance of Equity Interests by any of the Company's Restricted
          Subsidiaries or the sale of Equity Interests in any of its
          Subsidiaries,

     Notwithstanding the preceding, the following items shall be deemed not to
be Asset Sales:

     (1)  any single transaction or series of related transactions that: (a)
          involves assets having a fair market value of less than U.S. $1.0
          million; or (b) results in net proceeds to the Company and its
          Restricted Subsidiaries of less than U.S. $1.0 million;

     (2)  a transfer of assets between or among the Company and its Restricted
          Subsidiaries or between Restricted Subsidiaries,

     (3)  Permitted Telecommunication Asset Dispositions;

     (4)  an issuance of Equity Interests by a Restricted Subsidiary to the
          Company or to a Wholly-Owned Restricted Subsidiary;

     (5)  a Permitted Investment or a Restricted Payment that is permitted by
          the provisions of Section 4.07; and

     (6)  sales of Equity Interests by the Company to minority shareholders of
          the Company; provided, such sales do not increase the ownership
          percentage of the minority shareholders of the Company in the Company.

     "Bankruptcy Law" means Title 11, U.S. Code, the Bankruptcy and Insolvency
Act (Canada) or the Companies' Creditors Arrangement Act (Canada) or any similar
federal, provincial, or state law of any jurisdiction relating to bankruptcy,
insolvency, winding up, liquidation, reorganization or relief of debtors.

     "Beneficial Owner" has the meaning assigned to such term in Rule 13d-3 and
Rule 13d-5 under the Exchange Act, except that in calculating the beneficial
ownership of any particular "person" (as such term is used in Section 13(d)(3)
of the Exchange Act), such "person" shall be deemed to have beneficial ownership
of all securi-

                                      -2-
<PAGE>

ties that such "person" has the right to acquire, whether such
right is currently exercisable or is exercisable only upon the occurrence of a
subsequent condition.

     "Board of Directors" means the Board of Directors of the Company, or any
authorized committee of the Board of Directors.

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

     "Broker-Dealer" has the meaning set forth in the Registration Rights
Agreement.

     "Business Day" means any day other than a Legal Holiday.

     "Canadian FOTS" means the 5,400 mile fiber optic network development across
Canada and the Northern United States constructed by Ledcor Inc. and its
Affiliates, as described in the Offering Memorandum.

     "Canadian Taxing Authority" means any federal, provincial, territorial or
other Canadian government or any authority or agency therein or thereof having
power to tax.

     "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at that time be required to be capitalized on a balance sheet in accordance with
GAAP.

     "Capital Stock" means:

     (1)  in the case of a corporation, corporate stock;

     (2)  in the case of an association or business entity, any and all shares,
          interests, participations, rights or other equivalents (however
          designated) of corporate stock;

     (3)  in the case of a partnership or limited liability company, partnership
          or membership interests (whether general or limited); and

     (4)  any other interest or participation that confers on a Person the right
          to receive a share of the profits and losses of, or distributions of
          assets of, the issuing Person.

     "Cash Equivalents" means any of the following:

     (1)  any investment in direct obligations of the United States of America
          or any agency thereof, of any European Union Member or any agency
          thereof or of Canada or any province or agency thereof of obligations
          guaranteed by the United States of America or any agency thereof, of
          any European Union Member or any agency thereof or of Canada or any
          province or agency thereof, in each case with a term of not more than
          one year (provided that any province of Canada must be rated at least
          "R-1" by the Dominion Bond Rating Service Limited);

     (2)  investments in time deposit accounts, term deposit accounts,
          certificates of deposit, money-market deposits, bankers acceptances
          and obligations maturing within one year of the date of acquisition
          thereof issued by a bank or trust company which is organized under the
          laws of the United States of America, any state thereof, any European
          Union Member, Canada or

                                      -3-
<PAGE>

          any province thereof, and which bank or trust company has, or the
          obligations of which bank or trust company is guaranteed by a bank or
          trust company which has, capital, surplus and undivided profits
          aggregating in excess of U.S. $150.0 million (or the foreign currency
          equivalent thereof) and has outstanding debt which is rated "A" (or
          such similar equivalent rating) or higher by at least one "nationally
          recognized statistical rating organization" (as defined in Rule 436
          under the Securities Act) or by Dominion Bond Rating Service Limited
          or Canadian Bond Rating Service, Inc. or any money-market fund
          sponsored by a registered broker dealer or mutual fund distributor;

     (3)  repurchase obligations with a term of not more than 30 days for
          underlying securities of the types described in clause (1) above
          entered into with a bank meeting the qualifications described in
          clause (2) above;

     (4)  investments in commercial paper, maturing not more than 90 days after
          the date of acquisition, issued by a corporation (other than the
          Company or an Affiliate of the Company) organized and in existence
          under the laws of the United States of America, a European Union
          Member or Canada 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 or at least "R-1" by Dominion Bond Rating
          Service Limited or Canadian Bond Rating Service (in the case of a
          Canadian issuer);

     (5)  investments in securities with maturities of six months or less from
          the date of acquisition issued or fully guaranteed by any state,
          commonwealth, territory or province of the United States of America, a
          European Union Member or Canada, or by any political subdivision or
          taxing authority thereof, and rated at least "R-1" by the Dominion
          Bond Rating Service Limited (in the case of a Canadian issuer);

     (6)  investments in money market funds at least 95% of the assets of which
          constitute Cash Equivalents of the kinds described in clauses (1)
          through (5) of this definition; and

     (7)  all obligations of the United States of America, a member state of the
          European Union, Canada or any other sovereign nation which are
          authorized under the terms governing any Indebtedness of the Company
          from time to time outstanding to be deposited in connection with a
          legal defeasance, covenant defeasance or final discharge of such
          Indebtedness.

     "Change of Control" means the occurrence of any of the following:

     (1)  the sale, transfer, conveyance or other disposition (other than by way
          of merger or consolidation), in one or a series of related
          transactions, of all or substantially all of the assets of the Company
          and its Subsidiaries taken as a whole to any "person" (as such term is
          used in Section 13(d)(3) of the Exchange Act) other than a Permitted
          Holder;

     (2)  the adoption of a plan relating to the liquidation or dissolution of
          the Company;

     (3)  the consummation of any transaction (including, without limitation,
          any merger or consolidation) the result of which is that any "person"
          (as defined above), other than a Permitted Holder, becomes the
          Beneficial Owner, directly or indirectly, of more than 50% (the
          "Voting Threshhold") of the Voting Stock of the Company, measured by
          voting power rather than number of shares; provided that if, in the
          opinion of nationally recognized tax counsel to the Company, based on
          a change to the Income Tax Act (Canada) or regulations adopted
          thereunder, the pub-

                                      -4-
<PAGE>

          lished administrative practices of the Canada Customs and Revenue
          Agency or the publication of a judicial decision in each case enacted,
          promulgated or published after the Issue Date, which change in law,
          regulation or publication of an administrative practice or judicial
          decision provides that in reference to a change of control which is an
          acceptable "triggering event" for purposes of subparagraph
          212(1)(b)(vii) of the Income Tax Act (Canada), requiring the Company
          to initiate a Change of Control Offer, that control generally means a
          voting threshold of 50% or less (the "Reduced Voting Threshold"), then
          the Voting Threshold shall be reduced on a prospective basis to such
          Reduced Voting Threshold, but in no event shall the Reduced Voting
          Threshold be less than 35%;

     (4)  the first day on which a majority of the members of the Board of
          Directors of the Company are not Continuing Directors;

     (5)  the Company consolidates with, or merges with or into, any Person, or
          any Person consolidates with, or merges with or into, the Company, in
          any such event pursuant to a transaction in which any of the
          outstanding Voting Stock of the Company is converted into or exchanged
          for cash, securities or other property, other than any such
          transaction where the Voting Stock of the Company outstanding
          immediately prior to such transaction is converted into or exchanged
          for Voting Stock (other than Disqualified Stock) of the surviving or
          transferee Person constituting a majority of the outstanding shares of
          such Voting Stock of such surviving or transferee Person immediately
          after giving effect to such issuance;

     (6)  any Person other than a Permitted Holder shall succeed in having a
          sufficient number of its nominees elected to the Board of Directors of
          the Company such that such nominees will constitute a majority of the
          Company's Board of Directors; or

     (7)  the Company or any of its Restricted Subsidiaries pursuant to or
          within the meaning of Bankruptcy Law:

          (i)  commences a voluntary case,

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

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

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

          (v)  generally is not paying its debts as they become due; or

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

          (i)  is for relief against the Company or any of its Restricted
               Subsidiaries in an involuntary case;

          (ii) appoints a custodian of the Company or any of its Restricted
               Subsidiaries or for all or substantially all of the property of
               the Company or any of its Restricted Subsidiaries; or

          (iii) orders the liquidation of the Company or any of its Restricted
               Subsidiaries;

                                      -5-
<PAGE>

     and the order or decree remains unstayed and in effect for 60 consecutive
     days.

     "Clearstream" means Clearstream Banking, or any successor thereto.

     "Company" means 360networks inc., a company continued under the laws of the
Province of Nova Scotia, Canada, and any and all successors thereto.

     "Concurrent Equity Offering" means the initial public offering by the
Company of its Subordinate Voting Shares made pursuant to a registration
statement on Form F-1 (No. 333-95621) filed with the SEC on January 28, 2000, as
such registration statement is amended or supplemented from time to time.

     "Consolidated Capital Ratio" means, with respect to the Company as of any
date, the ratio of (i) the aggregate consolidated principal amount of
Indebtedness of the Company and its Restricted Subsidiaries then outstanding to
(ii) the Consolidated Net Worth of the Company and its Restricted Subsidiaries
as of such date, in each case as shown on the consolidated balance sheet of the
Company in accordance with GAAP.

     "Consolidated Cash Flow" means, with respect to any Person for any period,
the Consolidated Net Income of such Person for such period plus:

     (1)  provision for taxes based on income or profits of such Person and its
          Restricted Subsidiaries for such period, to the extent that such
          provision for taxes was deducted in computing such Consolidated Net
          Income; plus

     (2)  Fixed Charges of such Person and its Restricted Subsidiaries for such
          period, whether paid or accrued and whether or not capitalized
          (including, without limitation, amortization of debt issuance costs
          and original issue discount, non-cash interest payments, the interest
          component of any deferred payment obligations, the interest component
          of all payments associated with Capital Lease Obligations,
          commissions, discounts and other fees and charges incurred in respect
          of letter of credit or bankers' acceptance financings, and net
          payments, if any, pursuant to Hedging Obligations), to the extent that
          any such expense was deducted in computing such Consolidated Net
          Income; plus

     (3)  depreciation, amortization (including amortization of goodwill and
          other intangibles but excluding amortization of prepaid cash expenses
          that were paid in a prior period) and other non-cash expenses
          (excluding any such non-cash expense to the extent that it represents
          an accrual of or reserve for cash expenses in any future period or
          amortization of a prepaid cash expense that was paid in a prior
          period) of such Person and its Restricted Subsidiaries for such period
          to the extent that such depreciation, amortization and other non-cash
          expenses were deducted in computing such Consolidated Net Income;
          minus

     (4)  non-cash items increasing such Consolidated Net Income for such
          period, other than items that were accrued in the ordinary course of
          business, in each case, on a consolidated basis and determined in
          accordance with GAAP. Notwithstanding the preceding, the provision for
          taxes based on the income or profits of, and the depreciation and
          amortization and other non-cash charges of, a Restricted Subsidiary of
          the Company shall be added to Consolidated Net Income to compute
          Consolidated Cash Flow of the Company only to the extent that a
          corresponding amount would be permitted at the date of determination
          to be dividended to the Company by such Restricted Subsidiary without
          prior approval (that has not been obtained), pursuant to the terms of
          its charter and all agreements, instruments, judgments, decrees,
          orders, statutes, rules and governmental regulations applicable to
          that Subsidiary or its stockholders.

                                      -6-
<PAGE>

     "Consolidated Leverage Ratio" means, with respect to the Company, as of any
date, the ratio of (i) the aggregate amount of Indebtedness of the Company and
its Restricted Subsidiaries then outstanding (other than intercompany debt) to
(ii) the Consolidated Cash Flow of the Company and its Restricted Subsidiaries
on a consolidated basis for the most recently ended four fiscal quarters
immediately preceding the date of determination for which consolidated financial
statements of the Company are available (the "Reference Period").

     In addition to the foregoing, for purposes of this definition,
"Consolidated Cash Flow" shall be calculated on a pro forma basis after giving
effect to the issuance of the Notes and the Dollar Notes and the incurrence of
the Indebtedness (and the application of the proceeds therefrom) giving rise to
the need to make such calculation and any incurrence (and the application of the
proceeds therefrom) or repayment of Indebtedness, other than the incurrence or
repayment of indebtedness for ordinary working capital purposes, at any time
subsequent to the beginning of the Reference Period and on or prior to the date
of determination, as if such occurrence (and the application of the proceeds
thereof), or the repayment, as the case may be, occurred on the first day of the
Reference Period.

     "Consolidated Net Income" means, with respect to any specified Person for
any period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that:

     (1)  the Net Income (but not loss) of any Person that is not a Restricted
          Subsidiary or that is accounted for by the equity method of accounting
          shall be included only to the extent of the amount of dividends or
          distributions paid in cash to the specified Person or a Restricted
          Subsidiary thereof;

     (2)  the Net Income of any Restricted Subsidiary shall be excluded to the
          extent that the declaration or payment of dividends or similar
          distributions by that Restricted Subsidiary of that Net Income is not
          at the date of determination permitted without any prior governmental
          approval (that has not been obtained) or, directly or indirectly, by
          operation of the terms of its charter or any agreement, instrument,
          judgment, decree, order, statute, rule or governmental regulation
          applicable to that Restricted Subsidiary or its stockholders, it being
          understood that the Net Income of any such Restricted Subsidiary for
          such period shall be included in Consolidated Net Income up to the
          aggregate amount of cash that such Restricted Subsidiary could have
          paid pursuant to such dividends or similar distributions during such
          period to the Company or any of its Restricted Subsidiaries;

     (3)  the Net Income of any Person acquired in a pooling of interests
          transaction for any period prior to the date of such acquisition shall
          be excluded;

     (4)  the Net Income (but not loss) of any Unrestricted Subsidiary shall be
          excluded, whether or not distributed to the specified Person or one of
          its Subsidiaries, except for purposes of the provisions of Sections
          4.07 and 4.09 hereof, in which case the Net Income of any Unrestricted
          Subsidiary will be included to the extent it would otherwise be
          included under clause (1) of this definition above; and

     (5)  the cumulative effect of a change in accounting principles shall be
          excluded.

     "Consolidated Net Worth" means, with respect to the Company as of any date,
the sum of (i) the consolidated equity of the common stockholders of the Company
and its Restricted Subsidiaries that are Restricted Subsidiaries as of such date
plus (ii) the respective amounts reported on the Company's balance sheet as of
such date with respect to any series of Preferred Stock (other than Disqualified
Stock) that by its terms is not entitled

                                      -7-
<PAGE>

to the payment of dividends unless such dividends may be declared and paid only
out of net earnings in respect of the year of such declaration and payment, but
only to the extent of any cash received by the Company upon issuance of such
Preferred Stock plus (iii) the Adjusted Fiber Value, less (x) all write-ups
(other than write-ups resulting from foreign currency translations and write-ups
of tangible assets of a going concern business made within 12 months after the
acquisition of such business) subsequent to the Issue Date in the book value of
any asset owned by the Company or a Restricted Subsidiary of the Company, (y)
all outstanding net Investments as of such date in unconsolidated Restricted
Subsidiaries and in Persons that are not Restricted Subsidiaries, and (z) all
unamortized debt discount and expense and unamortized deferred charges as of
such date, all of the foregoing determined in accordance with GAAP.

     "Continuing Director" means, as of any date of determination, any member of
the Board of Directors of the Company who:

     (1)  was a member of such Board of Directors on the Issue Date; or

     (2)  was nominated for election or elected to such Board of Directors with
          the approval of a majority of the Continuing Directors who were
          members of such Board at the time of such nomination or election.

     "Corporate Trust Office of the Trustee" shall be at the address of the
Trustee specified in Section 10.02 hereof or such other address as to which the
Trustee may give notice to the Company.

     "Credit Facilities" means, with respect to the Company or any of its
Restricted Subsidiaries, one or more debt facilities or commercial paper
facilities, in each case with banks or other institutional lenders providing for
loans or letters of credit, in each case, as amended, restated, modified,
renewed, refunded, replaced or refinanced in whole or in part from time to time.

     "Custodian" means the Trustee, as custodian with respect to the Notes in
global form, or any successor entity thereto.

     "Default" means any event that is, or with the passage of time or the
giving of notice or both would be, an Event of Default.

     "Definitive Note" means a certificated Note registered in the name of the
Holder thereof and issued in accordance with Section 2.06 hereof, substantially
in the form of Exhibit A hereto, except that such Note shall not bear the Global
Note Legend and shall not have the "Schedule of Exchanges of Interests in the
Global Note" attached thereto.

     "Depositary" means, with respect to the Global Notes, the Person specified
in Section 2.03 hereof as the Depositary with respect to the Notes, and any and
all successors thereto appointed as depositary hereunder and having become such
pursuant to the applicable provision of this Indenture.

     "Disqualified Stock" means any Capital Stock that, by its terms (or by the
terms of any security into which it is convertible, or for which it is
exchangeable, in each case at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature.

     Notwithstanding the preceding sentence, any Capital Stock that would
constitute Disqualified Stock solely because the holders thereof have the right
to require the Company to repurchase such Capital Stock upon

                                      -8-
<PAGE>

the occurrence of a change of control or an asset sale shall not constitute
Disqualified Stock if the terms of such Capital Stock provide that the Company
may not repurchase or redeem any such Capital Stock pursuant to such provisions
unless such repurchase or redemption complies with provisions of Section 4.07
hereof.

     "Dollar Exchange Notes" means the Dollar Notes issued in an exchange offer
pursuant to Section 2.06(f) of the Dollar Indenture.

     "Dollar Indenture" means the indenture, dated as of April 26, 2000, between
the Company and HSBC Bank USA, as trustee, governing the Dollar Notes.

     "Dollar Notes" means the Company's U.S. Dollar-denominated 13% Senior Notes
due 2008, issued pursuant to the Dollar Indenture.

     "EEA Government Obligation" means direct non-callable obligations of, or
non-callable obligations guaranteed by, any European Union member for the
payment of which obligation or guarantee the full faith and credit of the
respective nation is pledged; provided that such nation has a credit rating at
least equal to that of the highest rated member nation of the European Economic
Area.

     "Eligible Investments" means cash or Cash Equivalents or such other
investment grade debt securities as the Board of Directors shall approve from
time to time; provided, however, that in no event shall any funds required to be
held as Eligible Investments be used, directly or indirectly, to repurchase any
Notes.

     "Equity Interests" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

     "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels
office, as operator of the Euroclear system.

     "European Economic Area" means the member nations of the European Economic
Area pursuant to the Oporto Agreement on the European Economic Area, dated May
2, 1992, as amended.

     "European Union Member" means any country that is or becomes a member of
the European Union or any successor organization thereto.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "Exchange Notes" means the Notes issued in the Exchange Offer pursuant to
Section 2.06(f) hereof.

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

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

     "Existing Indebtedness" means Indebtedness of the Company or any of its
Restricted Subsidiaries outstanding on the Issue Date (other than the Credit
Facilities).

     "Fixed Charges" means, with respect to any Person for any period, the sum,
without duplication, of:

     (1)  the consolidated interest expense of such Person and its Restricted
          Subsidiaries for such period, whether paid or accrued, including,
          without limitation, amortization of debt issuance costs and

                                      -9-
<PAGE>

          original issue discount, non-cash interest payments, the interest
          component of any deferred payment obligations, the interest component
          of all payments associated with Capital Lease Obligations,
          commissions, discounts and other fees and charges incurred in respect
          of letter of credit or bankers' acceptance financings, and net
          payments, if any, pursuant to Hedging Obligations; plus

     (2)  the consolidated interest of such Person and its Restricted
          Subsidiaries that was capitalized during such period; plus

     (3)  any interest expense on Indebtedness of another Person that is
          Guaranteed by such Person or one of its Restricted Subsidiaries or
          secured by a Lien on assets of such Person or one of its Restricted
          Subsidiaries, whether or not such Guarantee or Lien is called upon;
          plus

     (4)  the product of (a) all dividend payments, whether or not in cash, on
          any series of preferred stock (including, without limitation,
          Disqualified Stock) of such Person or any of its Restricted
          Subsidiaries, other than dividend payments on Equity Interests payable
          solely in Equity Interests of the Company (other than Disqualified
          Stock) or to the Company or a Restricted Subsidiary of the Company,
          times (b) a fraction, the numerator of which is one and the
          denominator of which is one minus the then current combined federal,
          state and local statutory tax rate of such Person, expressed as a
          decimal, in each case, on a consolidated basis and in accordance with
          GAAP.

     "Foreign Subsidiary" means any Restricted Subsidiary of the Company which
(i) is not organized under the laws of (x) the United States or any state
thereof, (y) the District of Columbia or (z) Canada or any province thereof and
(ii) conducts substantially all of its business operations outside the United
States of America and Canada.

     "GAAP" means generally accepted accounting principles in the United States
as set forth in the opinions and pronouncements of the Accounting Principles
Board of the American Institute of Certified Public Accountants and statements
and pronouncements of the Financial Accounting Standards Board or in such other
statements by such other entity as have been approved by a significant segment
of the accounting profession, which are in effect from time to time.

     "Global Notes" means, individually and collectively, each of the Restricted
Global Notes and the Unrestricted Global Notes.

     "Global Note Legend" means the legend set forth in Section 2.06(g)(ii),
which is required to be placed on all Global Notes issued under this Indenture.

     "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America, and the payment for which the
United States pledges its full faith and credit.

     "Guarantee" means a guarantee other than by endorsement of negotiable
instruments for collection in the ordinary course of business, direct or
indirect, in any manner including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof, of all or any part of any Indebtedness.

     "Hedging Obligations" means, with respect to any Person, the obligations of
such Person under:

                                      -10-
<PAGE>

     (1)  interest rate swap agreements, interest rate cap agreements and
          interest rate collar agreements; and

     (2)  other agreements or arrangements designed to protect such Person
          against fluctuations in interest rates.

     "Hibernia Subsidiaries" means Worldwide Telecom (USA) Inc., Worldwide
Telecom (Canada) Inc., WTI Telecom (UK) Limited, WTI Telecom (Ireland) Limited,
Worldwide Telecom (Barbados) Inc., Worldwide Telecom (Bermuda) Ltd., Worldwide
Telecom Limited, Worldwide Telecom (Denmark) ApS, WTI Telecom Distribution (UK)
Limited and Worldwide Telecom Distribution (USA) Inc.

     "Indebtedness" means, with respect to any specified Person, any
indebtedness of such Person, whether or not contingent, in respect of:

     (1)  borrowed money;

     (2)  evidenced by bonds, notes, debentures or similar instruments or
          letters of credit (or reimbursement agreements in respect thereof);

     (3)  banker's acceptances;

     (4)  representing Capital Lease Obligations;

     (5)  the balance deferred and unpaid of the purchase price of any property,
          except any such balance that constitutes an accrued expense or trade
          payable; or

     (6)  representing any Hedging Obligations, if and to the extent any of the
          preceding items (other than letters of credit and Hedging Obligations)
          would appear as a liability upon a balance sheet of the specified
          Person prepared in accordance with GAAP. In addition, the term
          "Indebtedness" includes all Indebtedness of others secured by a Lien
          on any asset of the specified Person (whether or not such Indebtedness
          is assumed by the specified Person, which shall be deemed the lesser
          of the full amount of such Indebtedness and the fair market value of
          the property or asset so secured) and, to the extent not otherwise
          included, the Guarantee by such Person of any indebtedness of any
          other Person.

     The amount of any Indebtedness outstanding as of any date shall be:

     (1)  the accreted value thereof, in the case of any Indebtedness issued
          with original issue discount; and

     (2)  the principal amount thereof, together with any interest thereon that
          is more than 30 days past due, in the case of any other Indebtedness.

     "Indenture" means this Indenture, as amended or supplemented from time to
time.

     "Indirect Participant" means a Person who holds a beneficial interest in a
Global Note through a Participant.

     "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act, who are not also QIBs.

                                      -11-
<PAGE>

     "Interest Expense" means, with respect to any Person for any period,
without duplication, the sum of (i) the consolidated interest expense of such
Person and its Restricted Subsidiaries for such period, whether paid or accrued
(including, without limitation, amortization or original issue discount,
non-cash interest payments, the interest component of any deferred payment
obligations, the interest component of all payments associated with Capital
Lease Obligations, commissions, discounts and other fees and charges incurred in
respect of letter of credit or bankers' acceptance financings), all calculated
after taking into account the effect of all Hedging Obligations, and (ii) the
consolidated interest expense of such Person and its Restricted Subsidiaries
that was capitalized during such period, and (iii) any interest expense on
Indebtedness of another Person that is guaranteed by such Person or one of its
Restricted Subsidiaries or secured by a Lien on assets of such Person or one of
its Restricted Subsidiaries (whether or not such Guarantee or Lien is called
upon) and (iv) the product of (a) all dividend payments on any series of
preferred stock of such Person or any of its Restricted Subsidiaries, times (b)
a fraction, the numerator of which is one and the denominator of which is one
minus the then current combined federal, state and local statutory tax rate of
such Person, expressed as a decimal, in each case, on a consolidated basis and
in accordance with GAAP.

     "Investments" means, with respect to any Person, all investments by such
Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel and similar
advances to officers and employees made in the ordinary course of business),
purchases or other acquisitions for consideration of Indebtedness, Equity
Interests or other securities, together with all items that are or would be
classified as investments on a balance sheet prepared in accordance with GAAP.
If the Company or any Restricted Subsidiary of the Company sells or otherwise
disposes of any Equity Interests of any direct or indirect Restricted Subsidiary
of the Company such that, after giving effect to any such sale or disposition,
such Person is no longer a Restricted Subsidiary of the Company, the Company
shall be deemed to have made an Investment on the date of any such sale or
disposition equal to the fair market value of the Equity Interests of such
Restricted Subsidiary not sold or disposed of in an amount determined as
provided in the final paragraph of the provisions of Section 4.07.

     "IRU" means indefeasible rights of use, which is a long-term lease of
approximately 10 or 20 years with option periods thereafter to renew at lower
rates, at the option of the lessee.

     "Issue Date" means the first date on which any Notes were issued under this
Indenture.

     "Legal Holiday" means a Saturday, a Sunday or a day on which banking
institutions in the City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed. If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue on
such payment for the intervening period.

     "Letter of Transmittal" means the letter of transmittal to be prepared by
the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

     "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law,
including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction.

     "Measurement Date" means January 1, 1999.

     "Moody's" means Moody's Investors Service, Inc. or any successor to the
rating agency business thereof.

                                      -12-
<PAGE>

     "Net Income" means, with respect to any Person, the net income (loss) of
such Person and its Restricted Subsidiaries, determined in accordance with GAAP
and before any reduction in respect of preferred stock dividends, excluding,
however:

     (1)  any gain or loss, together with any related provision for taxes on
          such gain or loss, realized in connection with: (a) any Asset Sale; or
          (b) the disposition of any securities by such Person or any of its
          Restricted Subsidiaries or the extinguishment of any Indebtedness of
          such Person or any of its Restricted Subsidiaries; and

     (2)  any extraordinary gain or loss, together with any related provision
          for taxes on such extraordinary gain or loss.

     "Net Proceeds" means the aggregate cash proceeds received by the Company or
any of its Restricted Subsidiaries in respect of any Asset Sale (including,
without limitation, any cash received upon the sale or other disposition of any
non-cash consideration received in any Asset Sale), net of the direct costs
relating to such Asset Sale, including, without limitation, legal, accounting
and investment banking fees, and sales commissions, and any relocation expenses
incurred as a result thereof, taxes paid or payable as a result thereof, in each
case after taking into account any available tax credits or deductions and any
tax sharing arrangements and amounts required to be applied to the repayment of
Indebtedness secured by a Lien on the asset or assets that were the subject of
such Asset Sale.

     "Network" means the fiber optic telecommunications network constructed or
owned from time to time by the Company and its Restricted Subsidiaries.

     "Non-Competition Agreement" means that certain Letter to the Company from
Ledcor Inc., dated as of May 31, 1998, regarding Ledcor Inc.'s agreement not to
compete with the Company in the business of developing or constructing fiber
optic communications infrastructure.

     "Non-Recourse Debt" means Indebtedness:

     (1)  as to which neither the Company nor any of its Restricted Subsidiaries
          (a) provides credit support of any kind (including any undertaking,
          agreement or instrument that would constitute Indebtedness), (b) is
          directly or indirectly liable as a guarantor or otherwise, or (c)
          constitutes the lender; and

     (2)  no default with respect to which (including any rights that the
          holders thereof may have to take enforcement action against an
          Unrestricted Subsidiary) would permit upon notice, lapse of time or
          both any holder of any other Indebtedness (other than the Dollar
          Notes, the Notes, the 1999 Notes, the 1998 Notes or the Credit
          Facilities) of the Company or any of its Restricted Subsidiaries to
          declare a default on such other Indebtedness or cause the payment
          thereof to be accelerated or payable prior to its stated maturity.

     "Non-U.S. Person" means a Person who is not a U.S. Person.

     "Notes" has the meaning assigned to it in the preamble to this Indenture.

     "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

     "Offering" means the offering of the Notes by the Company.

                                      -13-
<PAGE>

     "Offering Memorandum" means that certain Offering Memorandum dated April
20, 2000 pursuant to which the Company offered the Notes and the Dollar Notes.

     "Officer" means, with respect to any Person, the Chairman of the Board, the
Chief Executive Officer, the President, the Chief Operating Officer, the Chief
Financial Officer, the Treasurer, any Assistant Treasurer, the Controller, the
Secretary or any Vice-President of such Person.

     "Officers' Certificate" means a certificate signed on behalf of the Company
by two Officers of the Company, one of whom must be the principal executive
officer, the chief financial officer, or the treasurer of the Company, that
meets the requirements of Section 10.05 hereof.

     "Opinion of Counsel" means an opinion from legal counsel who is reasonably
acceptable to the Trustee, that meets the requirements of Section 10.05 hereof.
The counsel may be an employee of or counsel to the Company, any Subsidiary of
the Company or the Trustee.

     "Parent Companies" means Ledcor Inc., an Alberta corporation, Worldwide
Fiber Holdings Ltd., an Alberta corporation, Ledcor Industries Limited, an
Alberta corporation, Ledcor Limited Partnership, a limited partnership of which
Ledcor Industries Limited is the general partner, and Ledcom Holdings Ltd., an
Alberta corporation.

     "Participant" means, with respect to Euroclear or Clearstream, a Person who
has an account with Euroclear or Clearstream, respectively.

     "Permitted Fiber Investment" means any Investment of up to 12 fibers on any
Segment of the Network.

     "Permitted Holder" means any Parent Company and its Affiliates.

     "Permitted Investments" means:

     (1)  any Investment in the Company or in any Restricted Subsidiary of the
          Company;

     (2)  any Investment in Cash Equivalents;

     (3)  any Investment by the Company or any Restricted Subsidiary of the
          Company in a Person, if as a result of such Investment:

          (a)  such Person becomes a Restricted Subsidiary of the Company; or

          (b)  such Person is merged, consolidated or amalgamated with or into,
               or transfers or conveys substantially all of its assets to, or is
               liquidated into, the Company or a Restricted Subsidiary of the
               Company;

     (4)  any Investment made as a result of the receipt of non-cash
          consideration from an Asset Sale that was made pursuant to and in
          compliance with the provisions of Section 4.10;

     (5)  any Investment made as a result of the receipt of non-cash
          consideration used or useful in a Telecommunications Business from any
          sale, lease, transfer, conveyance or other disposition of
          telecommunications capacity, transmission rights or other
          telecommunications services provided over the Company's network in the
          ordinary course of business which, if treated as an Asset Sale, would
          have been made in compliance with the provisions of Section 4.10;

                                      -14-
<PAGE>

     (6)  advances and loans to officers and employees of the Company or any
          Restricted Subsidiary in an amount not exceeding U.S. $5.0 million any
          one time outstanding;

     (7)  Investments in the form of intercompany Indebtedness to the extent
          permitted under clause (f) of the second paragraph of Section 4.09
          hereof;

     (8)  Hedging Obligations, provided that such Hedging Obligations constitute
          Permitted Indebtedness permitted by clause (g) of the second paragraph
          of Section 4.09 hereof;

     (9)  Investments of the Company or any Restricted Subsidiary existing on
          the Issue Date;

     (10) Investments in securities of trade creditors or customers received
          pursuant to any plan of reorganization or similar arrangement upon the
          bankruptcy or insolvency of such trade creditors or customers; and

     (11) other Investments in any Person having an aggregate fair market value
          (measured on the date each such Investment was made and without giving
          effect to subsequent changes in value), when taken together with all
          other Investments made pursuant to this clause (11) since the Issue
          Date, not to exceed the sum of U.S. $150.0 million plus 33 1/3% of the
          net proceeds of the Concurrent Equity Offering at any one time
          outstanding.

     "Permitted Liens" means:

     (1)  Liens on the assets of the Company and any Restricted Subsidiary of
          the Company securing Indebtedness and other Obligations under Credit
          Facilities that are permitted by the terms of this Indenture to be
          incurred;

     (2)  Liens in favor of the Company or its Restricted Subsidiaries;

     (3)  Liens on property of a Person existing at the time such Person becomes
          a Restricted Subsidiary of the Company or is merged with or into or
          consolidated with the Company or any Restricted Subsidiary of the
          Company; provided that such Liens were in existence prior to the
          contemplation of such Person becoming a Restricted Subsidiary of the
          Company or merger or consolidation and do not extend to any assets
          other than those of such person or the Person merged into or
          consolidated with the Company or the Restricted Subsidiary;

     (4)  Liens on property existing at the time of acquisition thereof by the
          Company or any Restricted Subsidiary of the Company, provided that
          such Liens were in existence prior to the contemplation of such
          acquisition;

     (5)  Liens to secure the performance of statutory obligations, surety or
          appeal bonds, performance bonds or other obligations of a like nature
          incurred in the ordinary course of business;

     (6)  Liens to secure Purchase Money Indebtedness and Vendor Financing
          Indebtedness permitted by clause (d) of the second paragraph of
          Section 4.09 covering only the assets (or portion thereof) acquired
          with such Indebtedness;

     (7)  Liens existing on the Issue Date;

                                      -15-
<PAGE>

     (8)  Liens for taxes, assessments or governmental charges or claims that
          are not yet delinquent or that are being contested in good faith by
          appropriate proceedings promptly instituted and diligently concluded,
          provided that any reserve or other appropriate provision as shall be
          required in conformity with GAAP shall have been made therefor;

     (9)  Liens created for the benefit of the Notes and the Dollar Notes;

     (10) Liens imposed by law or arising by operation of law, including,
          without limitation, landlords' mechanics', carriers' warehousemen's
          materialmen's, suppliers' and vendors' Liens, Liens for master's and
          crew's wages and other similar maritime Liens and mechanics' Liens, in
          each case which are incurred in the ordinary course of business for
          sums not yet delinquent or being contested in good faith, if such
          reserves or other appropriate provisions, if any, as shall be required
          by GAAP shall have been made with respect thereto;

     (11) zoning restrictions, easements, license, covenants, reservations,
          restrictions on the use of real property and defects, irregularities
          and deficiencies in title to real property that do not, individually
          or in the aggregate, materially affect the ability of the Company or
          any Restricted Subsidiary to conduct its business and are incurred in
          the ordinary course of business;

     (12) Liens incurred or pledges and deposits made in the ordinary course of
          business in connection with workers' compensation and unemployment
          insurance and other types of social security;

     (13) Liens to secure any extension, renewal, refinancing or refunding (or
          successive extensions, renewals, refinancings or refundings), in whole
          or in part, of any Indebtedness secured by Liens referred to in the
          foregoing clauses (3), (4), (6), and (7) of this definition, provided
          that such Liens do not extend to any other property of the Company or
          any Restricted Subsidiary and the principal amount of the Indebtedness
          secured by such Lien is not increased;

     (14) judgment Liens not giving rise to an Event of Default so long as such
          Lien is adequately bonded and any appropriate legal proceedings that
          may have been 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;

     (15) Liens securing obligations of the Company under Hedging Obligations
          permitted to be incurred under clause (g) of the second paragraph of
          Section 4.09 or any collateral for the Indebtedness to which such
          Hedging Obligations relate;

     (16) Liens upon specific items of inventory or other goods and proceeds of
          any Person securing such Person's obligations in respect of banker's
          acceptances issued or credited for the account of such Person to
          facilitate the purchase, shipment or storage of such inventory or
          other goods;

     (17) Liens securing reimbursement obligations with respect to commercial
          letters of credit which encumber documents and other property relating
          to such letters of credit and products and proceeds thereof;

     (18) Liens encumbering deposits made to secure obligations arising from
          statutory, regulatory, contractual, or warranty requirements of the
          Company or any of its Restricted Subsidiaries, including rights of
          offset and set-off;

                                      -16-
<PAGE>

     (19) Liens arising out of consignment or similar arrangements for the sale
          of goods in the ordinary course of business;

     (20) any interest or title of a lessor in the Property subject to any lease
          other than a Capital Lease;

     (21) leases or subleases granted to others that do not materially interfere
          with the ordinary course of business of the Company and its Restricted
          Subsidiaries;

     (22) Liens encumbering Property or other assets under construction arising
          from progress or partial payments by a customer or the company or its
          Restricted Subsidiaries relating to such Property or other assets;

     (23) Liens arising from filing Uniform Commercial Code financing statements
          regarding leases, provided that such Liens do not extend to any
          property or assets which are not leased property subject to such
          leases or subleases;

     (24) Liens in favor of customs and revenue authorities arising as a matter
          of law to secure payment of customs duties in connection with the
          importation of goods;

     (25) Liens securing Permitted ROW Indebtedness;

     (26) Liens securing other Indebtedness not exceeding U.S. $5.0 million at
          any time outstanding;

     (27) Liens incurred in the ordinary course of business of the Company or
          any Restricted Subsidiary of the Company with respect to obligations
          that do not exceed U.S. $5.0 million at any one time outstanding and
          that (a) are not incurred in connection with the borrowing of money or
          the obtaining of advances or credit (other than trade credit in the
          ordinary course of business) and (b) do not in the aggregate
          materially detract from the value of the property or materially impair
          the use thereof in the operation of business by the Company or such
          Restricted Subsidiary;

     (28) Liens securing Qualified Subsidiary Indebtedness to the extent
          permitted to be incurred by clause (h) of the second paragraph of
          Section 4.09 hereof; and

     (29) Liens securing Indebtedness which does not exceed 1.5 times the
          Company's Consolidated Cash Flow.

     "Permitted Project Financing Investment" means an Investment by the Company
or any Restricted Subsidiary in any Unrestricted Subsidiary for the purpose of
facilitating the incurrence by such Unrestricted Subsidiary of Non-Recourse Debt
for the purpose of financing a portion of the cost of construction, engineering,
acquisition, installation, development or improvement by such Unrestricted
Subsidiary of any Segment of the Network; provided, however, that the amount of
any such Investment shall not exceed 55% of the total initial capitalization of
any such Unrestricted Subsidiary.

     "Permitted Refinancing Indebtedness" means any Indebtedness of the Company
or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that:

     (1)  the principal amount (or accreted value, if applicable) of such
          Permitted Refinancing Indebtedness does not exceed the principal
          amount of (or accreted value, if applicable), plus accrued

                                      -17-
<PAGE>

          interest on, the Indebtedness so extended, refinanced, renewed,
          replaced, defeased or refunded (plus the amount of reasonable expenses
          incurred in connection therewith);

     (2)  such Permitted Refinancing Indebtedness has a final maturity date
          equal to or later than the final maturity date of, and has a Weighted
          Average Life to Maturity equal to or greater than the Weighted Average
          Life to Maturity of, the Indebtedness being extended, refinanced,
          renewed, replaced, defeased or refunded;

     (3)  if the Indebtedness being extended, refinanced, renewed, replaced,
          defeased or refunded is subordinated in right of payment to the Notes,
          such Permitted Refinancing Indebtedness has a final maturity date
          equal to or later than the final maturity date of, and is subordinated
          in right of payment to, the Notes on terms at least as favorable to
          the Holders of Notes as those contained in the documentation governing
          the Indebtedness being extended, refinanced, renewed, replaced,
          defeased or refunded; and

     (4)  such Indebtedness is incurred either by the Company or by the
          Restricted Subsidiary who is the obligor on the Indebtedness being
          extended, refinanced, renewed, replaced, defeased or refunded.

     "Permitted ROW Indebtedness" means Indebtedness evidencing the deferred
obligation to the seller of any ROW on which any Segment of the Company's
Network is being constructed to pay the purchase price for such ROW; provided,
however, that in no event shall the aggregate principal amount of any such
Indebtedness exceed, with respect to any Segment of the Network, more than 50%
of the total anticipated construction cost of such Segment, as determined by the
Board of Directors in good faith.

     "Permitted Telecommunications Asset Disposition" means the transfer,
conveyance, sale, lease, grant of an IRU or other disposition (each, a
"Disposition") in the ordinary course of business of dark fiber, conduit or
associated infrastructure of the Network, (i) the proceeds of which are treated
as revenues by the Company in accordance with GAAP and (ii) that, in the case of
the sale of dark fiber, would not result in the Company retaining less than (x)
24 fibers per route mile or (y) 12 fibers and one empty conduit per route mile,
in each case, on every Segment of the Network constructed or developed by the
Company (other than the Canadian FOTS in which the Company shall only be
required to retain six fibers per route mile on each Segment), provided,
however, that any Permitted Fiber Investment that results in the Company
retaining a minimum of 12 fibers per route mile (in the case of clause (x)
above) or one empty conduit (in the case of clause (y) above) shall be deemed to
be a Permitted Telecommunications Asset Disposition; provided further that any
subsequent Disposition of such Permitted Fiber Investment shall be deemed to be
an Asset Sale.

     "Permitted Vendor Facilities" means Vendor Financing Indebtedness that is
permitted to include working capital facilities.

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

     "Private Placement Legend" means the legend set forth in Section 2.06(g)(i)
to be placed on all Notes issued under this Indenture except where otherwise
permitted by the provisions of this Indenture.

     "Property" means, with respect to any Person, any interest of such Person
in any kind of property or asset, whether real, personal or mixed, or tangible
or intangible, including Capital Stock in, and other securities of, any other
Person.

                                      -18-
<PAGE>

     "Public Equity Offering" means any underwritten public offering of common
stock of the Company in which the gross proceeds to the Company are at least
U.S. $100.0 million.

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

     "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

     "Qualified Equity Offering" means (A) any underwritten public offering
(other than on Form S-4 or S-8 or any successor forms thereto) of common stock
of the Company in which the gross proceeds to the Company are at least U.S.
$100.0 million; provided, however, that the Concurrent Equity Offering shall not
be deemed to be a Qualified Equity Offering, or (B) the sale by the Company of
its Equity Interests to any Strategic Equity Investor, the net proceeds of which
are at least U.S. $25.0 million.

     "Qualified Subsidiary Indebtedness" means Indebtedness of any Restricted
Subsidiary under one or more senior credit agreements, senior secured loan
agreements or similar senior credit facilities (including any supply or similar
agreement under which the goods to be financed were obtained) entered into from
time to time, including related notes, guarantees, collateral documents,
instruments and agreements executed in connection therewith.

     "Registration Rights Agreement" means the A/B Exchange Registration Rights
Agreement, dated as of April 28, 2000, by and among the Company, Donaldson,
Lufkin & Jenrette Securities Corporation, Goldman Sachs & Co., Bear, Stearns &
Co. Inc., Chase Securities Inc., Credit Suisse First Boston Corporation, Morgan
Stanley & Co. Incorporated, Salomon Smith Barney Inc., RBC Dominion Securities
Corporation and TD Securities (USA) Inc., as such agreement may be amended,
modified or supplemented from time to time.

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

     "Regulation S Global Note" means a global Note bearing the Private
Placement Legend and deposited with or on behalf of the Depositary and
registered in the name of the Depositary or its nominee, issued in a
denomination equal to the outstanding principal amount of the Notes initially
sold in reliance on Rule 903 of Regulation S.

     "Responsible Officer," when used with respect to the Trustee, means any
officer within the Corporate Trust Department of the Trustee (or any successor
group of the Trustee) with direct responsibility for the administration of this
Indenture and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

     "Restricted Definitive Note" means a Definitive Note bearing the Private
Placement Legend.

     "Restricted Global Note" means a Global Note bearing the Private Placement
Legend.

     "Restricted Investment" means an Investment other than a Permitted
Investment.

                                      -19-
<PAGE>

     "Restricted Subsidiary" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary.

     "ROW" means Rights-of-way, licenses and permits (creating a contractual
interest and not an interest in land) from third party landowners and
governmental authorities which permit the holder to install conduit and fiber.

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

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

     "Rule 903" means Rule 903 promulgated under the Securities Act.

     "Rule 904" means Rule 904 promulgated the Securities Act.

     "S&P" means Standard & Poor's Ratings Group, a division of McGraw Hill,
Inc., or any successor to the rating agency business thereof.

     "SEC" means the Securities and Exchange Commission.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Segment" means (x) with respect to the intercity portions of the Network,
the through-portion of the Network between two local networks and (y) with
respect to a local portion of the Network, the entire through-portion of the
Network, excluding the spurs which branch off the through-portion.

     "Shelf Registration Statement" means the Shelf Registration Statement as
defined in the Registration Rights Agreement.

     "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date
hereof.

     "Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations to
repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

     "Strategic Equity Investor" means a corporation, partnership or other
entity engaged in one or more Telecommunications Businesses that has 80% or more
of the voting power of its Capital Stock owned by a Person or Persons that has
or have, as the case may be, at the time of the initial investment in the
Company, an equity market capitalization in excess of U.S. $1.0 billion;
provided that in no event shall any Affiliate of the Company (immediately prior
to the time of such investment) be eligible to be a Strategic Equity Investor.

     "Subsidiary" means, with respect to any Person:

     (1)  any corporation a majority of whose Capital Stock with voting power,
          under ordinary circumstances, to elect directors is, at the date of
          determination, directly or indirectly, owned by such Person (a
          "subsidiary"), by one or more subsidiaries of such Person or by such
          Person and one or more subsidiaries of such Person;

                                      -20-
<PAGE>

     (2)  a partnership in which such Person or a subsidiary of such Person is,
          at the date of determination, a general partner of such partnership;
          or

     (3)  any partnership, limited liability company or other Person in which
          such Person, a subsidiary of such Person or such Person and one or
          more subsidiaries of such Person, directly or indirectly, at the date
          of determination, has (x) at least a majority ownership interest or
          (y) the power to elect or appoint or direct the election or
          appointment of the managing partner or member of such Person or, if
          applicable, a majority of the directors or other governing body of
          such Person.

     "Tax" shall mean any tax, duty, levy, impost, assessment or other
governmental charge (including penalties, interest and any other liabilities
related thereto).

     "Telecommunications Assets" means all assets, rights (contractual or
otherwise) and properties, whether tangible or intangible, used or intended for
use in connection with a Telecommunications Business and the Equity Interests or
Indebtedness of a Person engaged primarily in a Telecommunications Business.

     "Telecommunications Business" means the business of (i) transmitting, or
providing services relating to the transmission of, voice, video or data through
owned or leased terrestrial or submarine transmission facilities and (ii)
constructing, installing, maintaining, creating, developing or marketing
terrestrial or submarine communications related network infrastructure,
components, equipment, software and other devices for use in a
telecommunications business and any other business or opportunity that is
reasonably related or complementary thereto; provided that the determination of
what constitutes a Telecommunications Business shall be made in good faith by
the Board of Directors.

     "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. ss.ss. 77aaa-77bbbb)
as in effect on the date on which this Indenture is qualified under the TIA;
provided, however, that in the event the Trust Indenture Act of 1939 is amended
after such date, then "TIA" means, to the extent required by such amendment, the
Trust Indenture Act of 1939 as so amended.

     "Trustee" means HSBC Bank USA until a successor replaces HSBC Bank USA in
accordance with the applicable provisions of this Indenture and thereafter means
the successor serving hereunder.

     "Undertaking Agreements" means those certain Undertaking Agreements dated
as of May 31, 1998 between the Company (formerly known as Starfiber Inc.) and
786522 Alberta Ltd. pursuant to which 786522 Alberta Ltd. agreed to contribute
12 fiber strands on the Canadian FOTS to the Company in exchange for the
issuance of certain Capital Stock and the Agreement, dated May 28, 1999, as
amended, between the Company and certain affiliates of Ledcor Inc. whereby the
Company agreed to acquire certain fiber optic assets.

     "Unrestricted Definitive Note" means one or more Definitive Notes that do
not bear and are not required to bear the Private Placement Legend.

     "Unrestricted Global Note" means a permanent global Note substantially in
the form of Exhibit A attached hereto that bears the Global Note Legend and that
has the "Schedule of Exchanges of Interests in the Global Note" attached
thereto, and that is deposited with or on behalf of and registered in the name
of the Depositary, representing Notes that do not bear the Private Placement
Legend.

     "Unrestricted Subsidiary" means any Subsidiary of the Company that is
designated by the Board of Directors as an Unrestricted Subsidiary pursuant to a
Board Resolution, but only to the extent that such Subsidiary:

                                      -21-
<PAGE>

     (1)  has no Indebtedness other than Non-Recourse Debt;

     (2)  is not party to any agreement, contract, arrangement or understanding
          with the Company or any Restricted Subsidiary of the Company unless
          the terms of any such agreement, contract, arrangement or
          understanding are no less favorable to the Company or such Restricted
          Subsidiary than those that might be obtained at the time from Persons
          who are not Affiliates of the Company;

     (3)  is a Person with respect to which neither the Company nor any of its
          Restricted Subsidiaries has any direct or indirect obligation to
          maintain or preserve such Person's financial condition or to cause
          such Person to achieve any specified levels of operating results;

     (4)  has not guaranteed or otherwise directly or indirectly provided credit
          support for any Indebtedness of the Company or any of its Restricted
          Subsidiaries; and

     (5)  has at least one director on its board of directors that is not a
          director or executive officer of the Company or any of its Restricted
          Subsidiaries and has at least one executive officer that is not a
          director or executive officer of the Company or any of its Restricted
          Subsidiaries.

     Any designation of a Subsidiary of the Company as an Unrestricted
Subsidiary shall be evidenced to the Trustee by filing with the Trustee a
certified copy of the Board Resolution giving effect to such designation and an
Officers' Certificate certifying that such designation complied with the
preceding conditions and was permitted by the provisions of Section 4.07. If, at
any time, any Unrestricted Subsidiary would fail to meet the preceding
requirements as an Unrestricted Subsidiary, it shall thereafter cease to be an
Unrestricted Subsidiary for purposes of this Indenture and any Indebtedness of
such Subsidiary shall be deemed to be incurred by a Restricted Subsidiary of the
Company as of such date and, if such Indebtedness is not permitted to be
incurred as of such date under Section 4.09, the Company shall be in default of
such covenant. The Board of Directors may at any time designate any Unrestricted
Subsidiary to be a Restricted Subsidiary; provided that such designation shall
be deemed to be an incurrence of Indebtedness by a Restricted Subsidiary of the
Company of any outstanding Indebtedness of such Unrestricted Subsidiary and such
designation shall only be permitted if (1) such Indebtedness is permitted under
the provisions of Section 4.09 hereof, calculated on a pro forma basis as if
such designation had occurred at the beginning of the four-quarter reference
period; and (2) no Default or Event of Default would be in existence following
such designation.

     "U.S. Person" means a U.S. person as defined in Rule 902(o) under the
Securities Act.

     "Vendor Financing Indebtedness" means Indebtedness of the Company incurred
pursuant to any agreements between the Company and one or more vendors or
lessors (or any Affiliate of any such vendor or lessor) of Telecommunications
Assets used or intended for use in a Telecommunications Business by the Company
providing financing for all or any part of the cost of construction,
engineering, acquisition, installation, development or improvement by the
Company or any Restricted Subsidiary of any Telecommunications Assets from any
such vendor or lessor (or any Affiliate of such vendor or lessor) and including
any related notes, Guarantees, collateral documents, instruments and agreements
executed in connection therewith, as the same may be amended, supplemented,
modified or restated from time to time. Vendor Financing Indebtedness shall not
include any working capital facility or Indebtedness to fund interest or other
similar expenses made available by any vendor or lessor.

     "Voting Stock" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the board of
directors of such Person.

                                      -22-
<PAGE>

     "Weighted Average Life to Maturity" means, when applied to any Indebtedness
at any date, the number of years obtained by dividing:

     (1)  the sum of the products obtained by multiplying (a) the amount of each
          then remaining installment, sinking fund, serial maturity or other
          required payments of principal, including payment at final maturity,
          in respect thereof, by (b) the number of years (calculated to the
          nearest one-twelfth) that will elapse between such date and the making
          of such payment; by

     (2)  the then outstanding principal amount of such Indebtedness.

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

Section 1.02. Other Definitions.

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

       "Additional Amounts".......................................       4.05
       "Affiliate Transaction"....................................       4.11
       "Agreement Currency".......................................       6.12
       "Asset Sale Offer".........................................       3.09
       "Authentication Order".....................................       2.02
       "Change of Control Offer"..................................       4.14
       "Change of Control Payment"................................       4.14
       "Change of Control Payment Date"...........................       4.14
       "Covenant Defeasance"......................................       8.03
       "Event of Default".........................................       6.01
       "Guaranteed Indebtedness"..................................       4.16
       "incur"....................................................       4.09
       "Judgment Currency"........................................       6.12
       "Legal Defeasance".........................................       8.02
       "Offer Amount".............................................       3.09
       "Offer Period".............................................       3.09
       "Paying Agent".............................................       2.03
       "Payment Default"..........................................       6.01
       "Permitted Debt"...........................................       4.09
       "Process Agent"............................................      10.09
       "Purchase Date"............................................       3.09
       "Reference Period".........................................       4.09
       "Registrar"................................................       2.03
       "Restricted Payments"......................................       4.07
       "Subsidiary Guarantee".....................................       4.16

Section 1.03. Incorporation by Reference of Trust Indenture Act.

     Whenever this Indenture refers to a provision of the TIA, the provision is
incorporated by reference in and made a part of this Indenture.

                                      -23-
<PAGE>

         The following TIA terms used in this Indenture have the following
meanings:

     "indenture securities" means the Notes;

     "indenture security Holder" means a Holder of a Note;

     "indenture to be qualified" means this Indenture;

     "indenture trustee" or "institutional trustee" means the Trustee; and

     "obligor" on the Notes means the Company and any successor obligor upon the
Notes.

     All other terms used in this Indenture that are defined by the TIA, defined
by TIA reference to another statute or defined by SEC rule under the TIA have
the meanings so assigned to them.

Section 1.04. Rules of Construction.

     (a)  Unless the context otherwise requires:

          (1)  a term has the meaning assigned to it;

          (2)  an accounting term not otherwise defined has the meaning assigned
               to it in accordance with GAAP;

          (3)  "or" is not exclusive;

          (4)  words in the singular include the plural, and in the plural
               include the singular;

          (5)  provisions apply to successive events and transactions;

          (6)  references to sections of or rules under the Securities Act shall
               be deemed to include substitute, replacement of successor
               sections or rules adopted by the SEC from time to time; and

          (7)  references to dollars or $ mean legal currency of the United
               States of America.

     (b) Whenever in this Indenture there is mentioned, in any context, the
payment of principal, premium, if any, redemption price, Change of Control
Payment, offer price or interest, or any other amount payable under or with
respect to any Note, such mention shall be deemed to include mention of the
payment of Additional Amounts to the extent that, in such context, Additional
Amounts are, were or would be payable in respect thereof.

                                    ARTICLE 2

                                    THE NOTES

Section 2.01. Form and Dating.

     (a) General. The Notes and the Trustee's certificate of authentication
thereon shall be substantially in the form of Exhibit A hereto. The Notes may
have notations, legends or endorsements required by law,

                                      -24-
<PAGE>

stock exchange rule or usage. Each Note shall be dated the date of its
authentication. The Notes shall be in denominations of eurodollars1,000 and
integral multiples thereof.

     The terms and provisions contained in the Notes shall constitute, and are
hereby expressly made, a part of this Indenture and the Company and the Trustee,
by their execution and delivery of this Indenture, expressly agree to such terms
and provisions and to be bound thereby. However, to the extent any provision of
any Note conflicts with the express provisions of this Indenture, the provisions
of this Indenture shall govern and be controlling.

     (b) Global Notes. Notes issued in global form shall be substantially in the
form of Exhibit A hereto (including the Global Note Legend thereon and the
"Schedule of Exchanges of Interests in the Global Note" attached thereto). Notes
issued in definitive form shall be substantially in the form of Exhibit A hereto
(but without the Global Note Legend thereon and without the "Schedule of
Exchanges of Interests in the Global Note" attached thereto). Each Global Note
shall represent such of the outstanding Notes as shall be specified therein and
each shall provide that it shall represent the aggregate principal amount of
outstanding Notes from time to time endorsed thereon and that the aggregate
principal amount of outstanding Notes represented thereby may from time to time
be reduced or increased, as appropriate, to reflect exchanges and redemptions.
Any endorsement of a Global Note to reflect the amount of any increase or
decrease in the aggregate principal amount of outstanding Notes represented
thereby shall be made by the Trustee or the Custodian, at the direction of the
Trustee, in accordance with instructions given by the Holder thereof as required
by Section 2.06 hereof.

     (c) Euroclear and Clearstream Procedures Applicable. The provisions of the
"Operating Procedures of the Euroclear System" and "Terms and Conditions
Governing Use of Euroclear" and the "General Terms and Conditions of
Clearstream" and "Customer Handbook" of Clearstream shall be applicable to
transfers of beneficial interests in the Global Notes that are held by
Participants through Euroclear or Clearstream.

Section 2.02. Execution and Authentication.

     One Officer shall sign the Notes for the Company by manual or facsimile
signature.

     If an Officer whose signature is on a Note no longer holds that office at
the time a Note is authenticated, the Note shall nevertheless be valid.

     A Note shall not be valid until authenticated by the manual signature of
the Trustee. The signature shall be conclusive evidence that the Note has been
authenticated under this Indenture.

     The Trustee shall, upon a written order of the Company signed by an Officer
(an "Authentication Order"), authenticate Notes for original issue, up to the
aggregate principal amount of Notes stated in paragraph 4 of the Notes. The
aggregate principal amount of Notes outstanding at any time may not exceed such
amount except as provided in Section 2.07 hereof.

     The Trustee may appoint an authenticating agent acceptable to the Company
to authenticate Notes. 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 an Agent to deal with Holders or an Affiliate of the Company.

Section 2.03. Registrar and Paying Agent.

     The Company shall maintain an office or agency where Notes may be presented
for registration of transfer or for exchange ("Registrar") and an office or
agency where Notes may be presented for payment ("Paying

                                      -25-
<PAGE>

Agent"). The Registrar shall keep a register of the Notes and of their transfer
and exchange. For so long as the Notes are listed on the Luxembourg Stock
Exchange and the rules of such stock exchange so require, the Company will
maintain a Paying Agent in Luxembourg. If a payment date is not a Business Day
at a place of payment, payment may be made at that place on the next succeeding
Business Day and no interest shall accrue with respect to such payment for the
intervening period. The term "Registrar" includes any co-registrar and the term
"Paying Agent" includes any additional paying agent. The Company shall notify
the Trustee in writing of the name and address of any Agent not a party to this
Indenture. If the Company fails to appoint or maintain another entity as
Registrar or Paying Agent, the Trustee shall act as such. The Company or any of
its Subsidiaries may act as Paying Agent or Registrar.

     The Company initially appoints HSBC Bank plc. to act as Depositary with
respect to the Global Notes.

     The Company initially appoints Banque Generale du Luxembourg to act as the
principal Registrar and Paying Agent at its office in Luxembourg, and HSBC Bank
plc. to act as Custodian with respect to the Global Notes at its office in
London. The Company may change the Paying Agent or Registrar without prior
notice to the Holders, and the Company or any of its Subsidiaries may act as
Paying Agent or Registrar; provided, however, that for so long as any Notes are
listed on the Luxembourg Stock Exchange and the rules of such exchange so
require, the Company will publish notice of the change in the Paying Agent in
Luxembourg in a daily newspaper with general circulation in Luxembourg (which is
expected to be the Luxemburger Wort). Any notice regarding Notes to be published
in Luxembourg will be published in the same manner.

Section 2.04. Paying Agent to Hold Money in Trust.

     The Company shall require each Paying Agent other than the Trustee to agree
in writing that the Paying Agent shall hold in trust for the benefit of Holders
or the Trustee all money held by the Paying Agent for the payment of principal,
premium, if any, or interest on the Notes, and shall notify the Trustee of any
default by the Company in making any such payment. While any such default
continues, the Trustee may require a Paying Agent to pay all money held by it to
the Trustee. The Company at any time may require a Paying Agent to pay all money
held by it to the Trustee. Upon payment over to the Trustee, the Paying Agent
(if other than the Company or a Subsidiary) shall have no further liability for
the money. If the Company or a Subsidiary acts as Paying Agent, it shall
segregate and hold in a separate trust fund for the benefit of the Holders all
money held by it as Paying Agent. Upon any bankruptcy or reorganization
proceedings relating to the Company, the Trustee shall serve as Paying Agent for
the Notes.

Section 2.05. Holder Lists.

     The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA ss. 312(a). If the Trustee is
not the Registrar, the Company shall furnish to the Trustee at least seven
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA ss. 312(a).

Section 2.06. Transfer and Exchange.

     (a) Transfer and Exchange of Global Notes. A Global Note may not be
transferred as a whole except by the Depositary to a nominee of the Depositary,
by a nominee of the Depositary to the Depositary or to another nominee of the
Depositary, or by the Depositary or any such nominee to a successor Depositary
or a nominee of such successor Depositary. All Global Notes shall be exchanged
by the Company for Definitive Notes if:

                                      -26-
<PAGE>

          (i) the Company delivers to the Trustee notice from Euroclear or
     Clearstream that it is no longer a clearing agency registered under the
     Exchange Act and, in either case, a successor clearing agency is not
     appointed by the Company within 120 days after the date of such notice from
     Euroclear or Clearstream;

          (ii) the Company in its sole discretion determines that the Global
     Notes (in whole but not in part) should be exchanged for Definitive Notes
     and delivers a written notice to such effect to the Trustee; or

          (iii) the Company delivers to the Trustee notice from the Depositary
     that it is unwilling or unable to continue to act as Depositary and a
     successor Depositary is not appointed by the Company within 120 days.

     Upon the occurrence of any of the preceding events in (i), (ii) or (iii)
above, Definitive Notes shall be issued in such names as the Depositary shall
instruct the Trustee. Global Notes also may be exchanged or replaced, in whole
or in part, as provided in Sections 2.07 and 2.10 hereof. Every Note
authenticated and delivered in exchange for, or in lieu of, a Global Note or any
portion thereof, pursuant to this Section 2.06 or Section 2.07 or 2.10 hereof,
shall be authenticated and delivered in the form of, and shall be, a Global
Note. A Global Note may not be exchanged for another Note other than as provided
in this Section 2.06(a), however, beneficial interests in a Global Note may be
transferred and exchanged as provided in Section 2.06(b), (c) or (f) hereof.

     (b) Transfer and Exchange of Beneficial Interests in the Global Notes. The
transfer and exchange of beneficial interests in the Global Notes shall be
effected through the Depositary, in accordance with the provisions of this
Indenture and the Applicable Procedures. Beneficial interests in the Restricted
Global Notes shall be subject to restrictions on transfer comparable to those
set forth herein to the extent required by the Securities Act. Transfers of
beneficial interests in the Global Notes also shall require compliance with
either subparagraph (i) or (ii) below, as applicable, as well as one or more of
the other following subparagraphs, as applicable:

          (i) Transfer of Beneficial Interests in the Same Global Note.
     Beneficial interests in any Restricted Global Note may be transferred to
     Persons who take delivery thereof in the form of a beneficial interest in
     the same Restricted Global Note in accordance with the transfer
     restrictions set forth in the Private Placement Legend. Beneficial
     interests in any Unrestricted Global Note may be transferred to Persons who
     take delivery thereof in the form of a beneficial interest in an
     Unrestricted Global Note. No written orders or instructions shall be
     required to be delivered to the Registrar to effect the transfers described
     in this Section 2.06(b)(i).

          (ii) All Other Transfers and Exchanges of Beneficial Interests in
     Global Notes. In connection with all transfers and exchanges of beneficial
     interests that are not subject to Section 2.06(b)(i) above, the transferor
     of such beneficial interest must deliver to the Registrar either:

               (A)(1) a written order from a Participant or an Indirect
          Participant given to the Depositary in accordance with the Applicable
          Procedures directing the Depositary to credit or cause to be credited
          a beneficial interest in another Global Note in an amount equal to the
          beneficial interest to be transferred or exchanged; and,

               (A)(2) instructions given in accordance with the Applicable
          Procedures containing information regarding the Participant account to
          be credited with such increase; or,

               (B)(1) a written order from a Participant or an Indirect
          Participant given to the Depositary in accordance with the Applicable
          Procedures directing the Depositary to cause to be

                                      -27-
<PAGE>

          issued a Definitive Note in an amount equal to the beneficial interest
          to be transferred or exchanged; and,

               (B)(2) instructions given by the Depositary to the Registrar
          containing information regarding the Person in whose name such
          Definitive Note shall be registered to effect the transfer or exchange
          referred to in (1) above.

          Upon consummation of an Exchange Offer by the Company in accordance
     with Section 2.06(f) hereof, the requirements of this Section 2.06(b)(ii)
     shall be deemed to have been satisfied upon receipt by the Registrar of the
     instructions contained in the Letter of Transmittal delivered by the holder
     of such beneficial interests in the Restricted Global Notes. Upon receipt
     of an Opinion of Counsel as to the satisfaction of all of the requirements
     for transfer or exchange of beneficial interests in Global Notes contained
     in this Indenture and the Notes or otherwise applicable under the
     Securities Act, the Trustee shall adjust the principal amount of the
     relevant Global Note(s) pursuant to Section 2.06(h) hereof.

          (iii) Transfer of Beneficial Interests to Another Restricted Global
     Note. A beneficial interest in any Restricted Global Note may be
     transferred to a Person who takes delivery thereof in the form of a
     beneficial interest in another Restricted Global Note if the transfer
     complies with the requirements of Section 2.06(b)(ii) above and the
     Registrar receives the following:

               (A) if the transferee will take delivery in the form of a
          beneficial interest in the 144A Global Note, then the transferor must
          deliver a certificate in the form of Exhibit B hereto, including the
          certifications in item (1) thereof; and

               (B) if the transferee will take delivery in the form of a
          beneficial interest in the Regulation S Global Note, then the
          transferor must deliver a certificate in the form of Exhibit B hereto,
          including the certifications in item (2) thereof;

          (iv) Transfer and Exchange of Beneficial Interests in a Restricted
     Global Note for Beneficial Interests in the Unrestricted Global Note. A
     beneficial interest in any Restricted Global Note may be exchanged by any
     holder thereof for a beneficial interest in an Unrestricted Global Note or
     transferred to a Person who takes delivery thereof in the form of a
     beneficial interest in an Unrestricted Global Note if the exchange or
     transfer complies with the requirements of Section 2.06(b)(ii) above and:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder of the beneficial interest to be transferred, in the
          case of an exchange, or the transferee, in the case of a transfer,
          certifies in the applicable Letter of Transmittal that it is not (1) a
          broker-dealer, (2) a Person participating in the distribution of the
          Exchange Notes or (3) a Person who is an affiliate (as defined in Rule
          144) of the Company;

               (B) such transfer is effected pursuant to the Shelf Registration
          Statement in accordance with the Registration Rights Agreement;

               (C) such transfer is effected by a Broker-Dealer pursuant to the
          Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                                      -28-
<PAGE>

                    (1) if the holder of such beneficial interest in a
               Restricted Global Note proposes to exchange such beneficial
               interest for a beneficial interest in an Unrestricted Global
               Note, a certificate from such holder in the form of Exhibit C
               hereto, including the certifications in item (1)(a) thereof; or

                    (2) if the holder of such beneficial interest in a
               Restricted Global Note proposes to transfer such beneficial
               interest to a Person who shall take delivery thereof in the form
               of a beneficial interest in an Unrestricted Global Note, a
               certificate from such holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          If any such transfer is effected pursuant to subparagraph (B) or (D)
     above at a time when an Unrestricted Global Note has not yet been issued,
     the Company shall issue and, upon receipt of an Authentication Order in
     accordance with Section 2.02 hereof, the Trustee shall authenticate one or
     more Unrestricted Global Notes in an aggregate principal amount equal to
     the aggregate principal amount of beneficial interests transferred pursuant
     to subparagraph (B) or (D) above.

          Beneficial interests in an Unrestricted Global Note cannot be
     exchanged for, or transferred to Persons who take delivery thereof in the
     form of, a beneficial interest in a Restricted Global Note.

     (c) Transfer or Exchange of Beneficial Interests for Definitive Notes.

          (i) Beneficial Interests in Restricted Global Notes to Restricted
     Definitive Notes. If any holder of a beneficial interest in a Restricted
     Global Note proposes to exchange such beneficial interest for a Restricted
     Definitive Note or to transfer such beneficial interest to a Person who
     takes delivery thereof in the form of a Restricted Definitive Note, then,
     upon receipt by the Registrar of the following documentation:

               (A) if the holder of such beneficial interest in a Restricted
          Global Note proposes to exchange such beneficial interest for a
          Restricted Definitive Note, a certificate from such holder in the form
          of Exhibit C hereto, including the certifications in item (2)(a)
          thereof;

               (B) if such beneficial interest is being transferred to a QIB in
          accordance with Rule 144A under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (1) thereof;

               (C) if such beneficial interest is being transferred to a
          Non-U.S. Person in an offshore transaction in accordance with Rule 903
          or Rule 904 under the Securities Act, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (2)
          thereof;

               (D) if such beneficial interest is being transferred pursuant to
          an exemption from the registration requirements of the Securities Act
          in accordance with Rule 144 under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (3)(a) thereof;

                                      -29-
<PAGE>

               (E) if such beneficial interest is being transferred to an
          Institutional Accredited Investor in reliance on an exemption from the
          registration requirements of the Securities Act other than those
          listed in subparagraphs (B) through (D) above, a certificate to the
          effect set forth in Exhibit B hereto, including the certifications,
          certificates and Opinion of Counsel required by item (3) thereof, if
          applicable;

               (F) if such beneficial interest is being transferred to the
          Company or any of its Subsidiaries, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (3)(b)
          thereof; or

               (G) if such beneficial interest is being transferred pursuant to
          an effective registration statement under the Securities Act, a
          certificate to the effect set forth in Exhibit B hereto, including the
          certifications in item (3)(c) thereof,

     the Trustee shall cause the aggregate principal amount of the applicable
     Global Note to be reduced accordingly pursuant to Section 2.06(h) hereof,
     and the Company shall execute and the Trustee shall authenticate and
     deliver to the Person designated in the instructions a Definitive Note in
     the appropriate principal amount. Any Definitive Note issued in exchange
     for a beneficial interest in a Restricted Global Note pursuant to this
     Section 2.06(c) shall be registered in such name or names and in such
     authorized denomination or denominations as the holder of such beneficial
     interest shall instruct the Registrar through instructions from the
     Depositary and the Participant or Indirect Participant. The Trustee shall
     deliver such Definitive Notes to the Persons in whose names such Notes are
     so registered. Any Definitive Note issued in exchange for a beneficial
     interest in a Restricted Global Note pursuant to this Section 2.06(c)(i)
     shall bear the Private Placement Legend and shall be subject to all
     restrictions on transfer contained therein.

          (ii) Beneficial Interests in Restricted Global Notes to Unrestricted
     Definitive Notes. A holder of a beneficial interest in a Restricted Global
     Note may exchange such beneficial interest for an Unrestricted Definitive
     Note or may transfer such beneficial interest to a Person who takes
     delivery thereof in the form of an Unrestricted Definitive Note only if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder of such beneficial interest, in the case of an
          exchange, or the transferee, in the case of a transfer, certifies in
          the applicable Letter of Transmittal that it is not (1) a
          broker-dealer, (2) a Person participating in the distribution of the
          Exchange Notes or (3) a Person who is an affiliate (as defined in Rule
          144) of the Company;

               (B) such transfer is effected pursuant to the Shelf Registration
          Statement in accordance with the Registration Rights Agreement;

               (C) such transfer is effected by a Broker-Dealer pursuant to the
          Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the holder of such beneficial interest in a
               Restricted Global Note proposes to exchange such beneficial
               interest for a Definitive Note that does not bear the Private
               Placement Legend, a certificate from such holder in the form of
               Exhibit C hereto, including the certifications in item (1)(b)
               thereof; or

                                      -30-
<PAGE>

                    (2) if the holder of such beneficial interest in a
               Restricted Global Note proposes to transfer such beneficial
               interest to a Person who shall take delivery thereof in the form
               of a Definitive Note that does not bear the Private Placement
               Legend, a certificate from such holder in the form of Exhibit B
               hereto, including the certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          (iii) Beneficial Interests in Unrestricted Global Notes to
     Unrestricted Definitive Notes. If any holder of a beneficial interest in an
     Unrestricted Global Note proposes to exchange such beneficial interest for
     a Definitive Note or to transfer such beneficial interest to a Person who
     takes delivery thereof in the form of a Definitive Note, then, upon
     satisfaction of the conditions set forth in Section 2.06(b)(ii) hereof, the
     Trustee shall cause the aggregate principal amount of the applicable Global
     Note to be reduced accordingly pursuant to Section 2.06(h) hereof, and the
     Company shall execute and the Trustee shall authenticate and deliver to the
     Person designated in the instructions a Definitive Note in the appropriate
     principal amount. Any Definitive Note issued in exchange for a beneficial
     interest pursuant to this Section 2.06(c)(iii) shall be registered in such
     name or names and in such authorized denomination or denominations as the
     holder of such beneficial interest shall instruct the Registrar through
     instructions from the Depositary and the Participant or Indirect
     Participant. The Trustee shall deliver such Definitive Notes to the Persons
     in whose names such Notes are so registered. Any Definitive Note issued in
     exchange for a beneficial interest pursuant to this Section 2.06(c)(iii)
     shall not bear the Private Placement Legend.

     (d) Transfer and Exchange of Definitive Notes for Beneficial Interests in
Global Notes.

          (i) Restricted Definitive Notes to Beneficial Interests in Restricted
     Global Notes. If any Holder of a Restricted Definitive Note proposes to
     exchange such Note for a beneficial interest in a Restricted Global Note or
     to transfer such Restricted Definitive Notes to a Person who takes delivery
     thereof in the form of a beneficial interest in a Restricted Global Note,
     then, upon receipt by the Registrar of the following documentation:

               (A) if the Holder of such Restricted Definitive Note proposes to
          exchange such Note for a beneficial interest in a Restricted Global
          Note, a certificate from such Holder in the form of Exhibit C hereto,
          including the certifications in item (2)(b) thereof;

               (B) if such Restricted Definitive Note is being transferred to a
          QIB in accordance with Rule 144A under the Securities Act, a
          certificate to the effect set forth in Exhibit B hereto, including the
          certifications in item (1) thereof;

               (C) if such Restricted Definitive Note is being transferred to a
          Non-U.S. Person in an offshore transaction in accordance with Rule 903
          or Rule 904 under the Securities Act, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (2)
          thereof;

               (D) if such Restricted Definitive Note is being transferred
          pursuant to an exemption from the registration requirements of the
          Securities Act in accordance with Rule 144 under

                                      -31-
<PAGE>

          the Securities Act, a certificate to the effect set forth in Exhibit B
          hereto, including the certifications in item (3)(a) thereof;

               (E) if such Restricted Definitive Note is being transferred to an
          Institutional Accredited Investor in reliance on an exemption from the
          registration requirements of the Securities Act other than those
          listed in subparagraphs (B) through (D) above, a certificate to the
          effect set forth in Exhibit B hereto, including the certifications,
          certificates and Opinion of Counsel required by item (3) thereof, if
          applicable;

               (F) if such Restricted Definitive Note is being transferred to
          the Company or any of its Subsidiaries, a certificate to the effect
          set forth in Exhibit B hereto, including the certifications in item
          (3)(b) thereof; or

               (G) if such Restricted Definitive Note is being transferred
          pursuant to an effective registration statement under the Securities
          Act, a certificate to the effect set forth in Exhibit B hereto,
          including the certifications in item (3)(c) thereof,

     the Trustee shall cancel the Restricted Definitive Note, increase or cause
     to be increased the aggregate principal amount of, in the case of clause
     (A) above, the appropriate Restricted Global Note, in the case of clause
     (B) above, the 144A Global Note, in the case of clause (C) above, the
     Regulation S Global Note.

          (ii) Restricted Definitive Notes to Beneficial Interests in
     Unrestricted Global Notes. A Holder of a Restricted Definitive Note may
     exchange such Note for a beneficial interest in an Unrestricted Global Note
     or transfer such Restricted Definitive Note to a Person who takes delivery
     thereof in the form of a beneficial interest in an Unrestricted Global Note
     only if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the Holder, in the case of an exchange, or the transferee, in the
          case of a transfer, certifies in the applicable Letter of Transmittal
          that it is not (1) a broker-dealer, (2) a Person participating in the
          distribution of the Exchange Notes or (3) a Person who is an affiliate
          (as defined in Rule 144) of the Company;

               (B) such transfer is effected pursuant to the Shelf Registration
          Statement in accordance with the Registration Rights Agreement;

               (C) such transfer is effected by a Broker-Dealer pursuant to the
          Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the Holder of such Definitive Notes proposes to
               exchange such Notes for a beneficial interest in the Unrestricted
               Global Note, a certificate from such Holder in the form of
               Exhibit C hereto, including the certifications in item (1)(c)
               thereof; or

                    (2) if the Holder of such Definitive Notes proposes to
               transfer such Notes to a Person who shall take delivery thereof
               in the form of a beneficial interest in the Unrestricted Global
               Note, a certificate from such Holder in the form of Exhibit B
               hereto, including the certifications in item (4) thereof;

                                      -32-
<PAGE>

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          Upon satisfaction of the conditions of any of the subparagraphs in
     this Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and
     increase or cause to be increased the aggregate principal amount of the
     Unrestricted Global Note.

          (iii) Unrestricted Definitive Notes to Beneficial Interests in
     Unrestricted Global Notes. A Holder of an Unrestricted Definitive Note may
     exchange such Note for a beneficial interest in an Unrestricted Global Note
     or transfer such Definitive Notes to a Person who takes delivery thereof in
     the form of a beneficial interest in an Unrestricted Global Note at any
     time. Upon receipt of a request for such an exchange or transfer, the
     Trustee shall cancel the applicable Unrestricted Definitive Note and
     increase or cause to be increased the aggregate principal amount of one of
     the Unrestricted Global Notes.

          If any such exchange or transfer from a Definitive Note to a
     beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D)
     or (iii) above at a time when an Unrestricted Global Note has not yet been
     issued, the Company shall issue and, upon receipt of an Authentication
     Order in accordance with Section 2.02 hereof, the Trustee shall
     authenticate one or more Unrestricted Global Notes in an aggregate
     principal amount equal to the principal amount of Definitive Notes so
     transferred.

     (e) Transfer and Exchange of Definitive Notes for Definitive Notes. Upon
request by a Holder of Definitive Notes and such Holder's compliance with the
provisions of this Section 2.06(e), the Registrar shall register the transfer or
exchange of Definitive Notes. Prior to such registration of transfer or
exchange, the requesting Holder shall present or surrender to the Registrar the
Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by its attorney, duly authorized in writing. In addition, the requesting Holder
shall provide any additional certifications, documents and information, as
applicable, required pursuant to the following provisions of this Section
2.06(e).

          (i) Restricted Definitive Notes to Restricted Definitive Notes. Any
     Restricted Definitive Note may be transferred to and registered in the name
     of Persons who take delivery thereof in the form of a Restricted Definitive
     Note if the Registrar receives the following:

               (A) if the transfer will be made pursuant to Rule 144A under the
          Securities Act, then the transferor must deliver a certificate in the
          form of Exhibit B hereto, including the certifications in item (1)
          thereof;

               (B) if the transfer will be made pursuant to Rule 903 or Rule
          904, then the transferor must deliver a certificate in the form of
          Exhibit B hereto, including the certifications in item (2) thereof;
          and

               (C) if the transfer will be made pursuant to any other exemption
          from the registration requirements of the Securities Act, then the
          transferor must deliver a certificate in the form of Exhibit B hereto,
          including the certifications, certificates and Opinion of Counsel
          required by item (3) thereof, if applicable.

                                      -33-
<PAGE>

          (ii) Restricted Definitive Notes to Unrestricted Definitive Notes. Any
     Restricted Definitive Note may be exchanged by the Holder thereof for an
     Unrestricted Definitive Note or transferred to a Person or Persons who take
     delivery thereof in the form of an Unrestricted Definitive Note if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the Holder, in the case of an exchange, or the transferee, in the
          case of a transfer, certifies in the applicable Letter of Transmittal
          that it is not (1) a broker-dealer, (2) a Person participating in the
          distribution of the Exchange Notes or (3) a Person who is an affiliate
          (as defined in Rule 144) of the Company;

               (B) any such transfer is effected pursuant to the Shelf
          Registration Statement in accordance with the Registration Rights
          Agreement;

               (C) any such transfer is effected by a Broker-Dealer pursuant to
          the Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the Holder of such Restricted Definitive Notes
               proposes to exchange such Notes for an Unrestricted Definitive
               Note, a certificate from such Holder in the form of Exhibit C
               hereto, including the certifications in item (1)(d) thereof; or

                    (2) if the Holder of such Restricted Definitive Notes
               proposes to transfer such Notes to a Person who shall take
               delivery thereof in the form of an Unrestricted Definitive Note,
               a certificate from such Holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests, an Opinion of Counsel in form reasonably acceptable to the
     Company to the effect that such exchange or transfer is in compliance with
     the Securities Act and that the restrictions on transfer contained herein
     and in the Private Placement Legend are no longer required in order to
     maintain compliance with the Securities Act.

          (iii) Unrestricted Definitive Notes to Unrestricted Definitive Notes.
     A Holder of Unrestricted Definitive Notes may transfer such Notes to a
     Person who takes delivery thereof in the form of an Unrestricted Definitive
     Note. Upon receipt of a request to register such a transfer, the Registrar
     shall register the Unrestricted Definitive Notes pursuant to the
     instructions from the Holder thereof.

     (f) Exchange Offer. Upon the occurrence of an Exchange Offer in accordance
with the Registration Rights Agreement, the Company shall issue and, upon
receipt of an Authentication Order in accordance with Section 2.02, the Trustee
shall authenticate (i) one or more Unrestricted Global Notes in an aggregate
principal amount equal to the principal amount of the beneficial interests in
the Restricted Global Notes tendered for acceptance by Persons that certify in
the applicable Letters of Transmittal that (x) they are not broker-dealers, (y)
they are not participating in a distribution of the Exchange Notes and (z) they
are not affiliates (as defined in Rule 144) of the Company, and accepted for
exchange in the Exchange Offer and (ii) Definitive Notes in an aggregate
principal amount equal to the principal amount of the Restricted Definitive
Notes accepted for exchange in the Exchange Offer. Concurrently with the
issuance of such Notes, the Trustee shall cause the aggregate principal amount
of the applicable Restricted Global Notes to be reduced accordingly, and the
Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

                                      -34-
<PAGE>

     (g) Legends. The following legends shall appear on the face of all Global
Notes and Definitive Notes issued under this Indenture unless specifically
stated otherwise in the applicable provisions of this Indenture.

          (i) Private Placement Legend.

                    (A) Except as permitted by subparagraph (B) below, each
               Global Note and each Definitive Note (and all Notes issued in
               exchange therefor or substitution thereof) shall bear the legend
               in substantially the following form:

               "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"), (B) IT HAS ACQUIRED THIS NOTE IN AN
               OFFSHORE TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE
               SECURITIES ACT OR (C) IT IS AN INSTITUTIONAL "ACCREDITED
               INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF
               REGULATION D UNDER THE SECURITIES ACT) (AN "IAI"), (2) AGREES
               THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THE 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) TO AN IAI THAT, PRIOR TO SUCH TRANSFER,
               FURNISHES THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN
               REPRESENTATIONS AND AGREEMENTS RELATING TO THE TRANSFER OF THIS
               NOTE (THE FORM OF WHICH CAN BE OBTAINED FROM THE TRUSTEE) AND ,
               IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT
               OF NOTES LESS THAN eurodollars250,000, AN OPINION OF COUNSEL
               ACCEPTABLE TO THE COMPANY THAT SUCH TRANSFER IS IN COMPLIANCE
               WITH THE SECURITIES ACT, (F) 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
               (G) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH
               CASE, IN ACCORDANCE WITH OTHER 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

                                      -35-
<PAGE>

               THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN
               VIOLATION OF THE FOREGOING."

               (B) Notwithstanding the foregoing, any Global Note or Definitive
          Note issued pursuant to subparagraphs (b)(iv), (c)(ii), (c)(iii),
          (d)(ii), (d)(iii), (e)(ii), (e)(iii) or (f) to this Section 2.06 (and
          all Notes issued in exchange therefor or substitution thereof) shall
          not bear the Private Placement Legend.

          (ii) Global Note Legend. Each Global Note shall bear a legend in
     substantially the following form:

     "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
     GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
     BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
     CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS
     MAY BE REQUIRED PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL
     NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a)
     OF THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE
     FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THE INDENTURE."

     (h) Cancellation and/or Adjustment of Global Notes. At such time as all
beneficial interests in a particular Global Note have been exchanged for
Definitive Notes or a particular Global Note has been redeemed, repurchased or
canceled in whole and not in part, each such Global Note shall be returned to or
retained and canceled by the Trustee in accordance with Section 2.11 hereof. At
any time prior to such cancellation, if any beneficial interest in a Global Note
is exchanged for or transferred to a Person who will take delivery thereof in
the form of a beneficial interest in another Global Note or for Definitive
Notes, the principal amount of Notes represented by such Global Note shall be
reduced accordingly and an endorsement shall be made on such Global Note by the
Trustee or by the Depositary at the direction of the Trustee to reflect such
reduction; and if the beneficial interest is being exchanged for or transferred
to a Person who will take delivery thereof in the form of a beneficial interest
in another Global Note, such other Global Note shall be increased accordingly
and an endorsement shall be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such increase.

     (i) General Provisions Relating to Transfers and Exchanges.

          (i) To permit registrations of transfers and exchanges, the Company
     shall execute and the Trustee shall authenticate Global Notes and
     Definitive Notes upon the Company's order or at the Registrar's request.

          (ii) No service charge shall be made to a holder of a beneficial
     interest in a Global Note or to a Holder of a Definitive Note for any
     registration of transfer or exchange, but the Company may require payment
     of a sum sufficient to cover any transfer tax or similar governmental
     charge payable in connection therewith (other than any such transfer taxes
     or similar governmental charge payable upon exchange or transfer pursuant
     to Sections 2.10, 3.06, 3.09, 4.10, 4.14 and 9.05 hereof).

          (iii) The Registrar shall not be required to register the transfer of
     or exchange any Note selected for redemption in whole or in part, except
     the unredeemed portion of any Note being redeemed in part.

                                      -36-
<PAGE>

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

          (v) The Company shall not be required (A) to issue, to register the
     transfer of or to exchange any Notes during a period beginning at the
     opening of business 15 days before the day of any selection of Notes for
     redemption under Section 3.02 hereof and ending at the close of business on
     the day of selection, (B) to register the transfer of or to exchange any
     Note so selected for redemption in whole or in part, except the unredeemed
     portion of any Note being redeemed in part or (C) to register the transfer
     of or to exchange a Note between a record date and the next succeeding
     Interest Payment Date.

          (vi) Prior to due presentment for the registration of a transfer of
     any Note, the Trustee, any Agent and the Company may deem and treat the
     Person in whose name any Note is registered as the absolute owner of such
     Note for the purpose of receiving payment of principal of and interest on
     such Notes and for all other purposes, and none of the Trustee, any Agent
     or the Company shall be affected by notice to the contrary.

          (vii) The Trustee shall authenticate Global Notes and Definitive Notes
     in accordance with the provisions of Section 2.02 hereof.

          (viii) All certifications, certificates and Opinions of Counsel
     required to be submitted to the Registrar pursuant to this Section 2.06 to
     effect a registration of transfer or exchange may be submitted by
     facsimile.

Section 2.07. Replacement Notes.

     If any mutilated Note is surrendered to the Trustee or the Company and the
Trustee receives evidence to its satisfaction of the destruction, loss or theft
of any Note, the Company shall issue and the Trustee, upon receipt of an
Authentication Order, shall authenticate a replacement Note if the Trustee's
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note.

     Every replacement Note is an obligation of the Company issued as evidence
of the same underlying indebtedness as the replaced Note and shall be entitled
to all of the benefits of this Indenture equally and proportionately with all
other Notes duly issued hereunder.

Section 2.08. Outstanding Notes.

     The Notes outstanding at any time are all the Notes authenticated by the
Trustee except for those canceled by it, those delivered to it for cancellation,
those reductions in the interest in a Global Note effected by the Trustee in
accordance with the provisions hereof, and those described in this Section as
not outstanding. Except as set forth in Section 2.09 hereof, a Note does not
cease to be outstanding because the Company or an Affiliate of the Company holds
the Note; however, Notes held by the Company or a Subsidiary of the Company
shall not be deemed to be outstanding for purposes of Section 3.07(b) hereof.

                                      -37-
<PAGE>

     If a Note is replaced pursuant to Section 2.07 hereof, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a protected purchaser.

     If the principal amount of any Note is considered paid under Section 4.01
hereof, it ceases to be outstanding and interest on it ceases to accrue.

     If the Paying Agent (other than the Company, a Subsidiary or an Affiliate
of any thereof) holds, on a redemption date or maturity date, money sufficient
to pay Notes payable on that date, then on and after that date such Notes shall
be deemed to be no longer outstanding and shall cease to accrue interest.

Section 2.09. Treasury Notes.

     In determining whether the Holders of the required principal amount of
Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person directly or indirectly controlling or controlled by or
under direct or indirect common control with the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that a Responsible Officer of the Trustee knows are so owned shall be
so disregarded.

Section 2.10. Temporary Notes.

     Until certificates representing Notes are ready for delivery, the Company
may prepare and the Trustee, upon receipt of an Authentication Order, shall
authenticate temporary Notes. Temporary Notes shall be substantially in the form
of certificated Notes but may have variations that the Company considers
appropriate for temporary Notes and as shall be reasonably acceptable to the
Trustee. Without unreasonable delay, the Company shall prepare and the Trustee
shall authenticate definitive Notes in exchange for temporary Notes.

     Holders of temporary Notes shall be entitled to all of the benefits of this
Indenture.

Section 2.11. Cancellation.

     The Company at any time may deliver Notes to the Trustee for cancellation.
The Registrar and Paying Agent shall forward to the Trustee any Notes
surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes in accordance with its customary procedures. The Company may not
issue new Notes to replace Notes that it has paid or that have been delivered to
the Trustee for cancellation.

Section 2.12. Defaulted Interest.

     If the Company defaults in a payment of interest on any Notes, it shall pay
the defaulted interest in any lawful manner plus, to the extent lawful, interest
payable on the defaulted interest, to the Persons who are Holders on a
subsequent special record date, in each case at the applicable rate provided in
such Notes and in Section 4.01 hereof. The Company shall notify the Trustee in
writing of the amount of defaulted interest proposed to be paid on each Note and
the date of the proposed payment. The Company shall fix or cause to be fixed
each such special record date and payment date, provided that no such special
record date shall be less than 10 days prior to the related payment date for
such defaulted interest. At least 15 days before the special record date, the
Company (or, upon the written request of the Company, the Trustee in the name
and at the expense of the Company) shall mail or cause to be mailed to Holders a
notice that states the special record date, the related payment date and the
amount of such interest to be paid.

                                      -38-
<PAGE>

                                    ARTICLE 3

                            REDEMPTION AND PREPAYMENT

Section 3.01. Notices to Trustee.

     If the Company elects to redeem Notes pursuant to the optional redemption
provisions of Section 3.07 hereof, it shall furnish to the Trustee, at least 30
days but not more than 60 days before a redemption date, an Officers'
Certificate setting forth (i) the clause of this Indenture pursuant to which the
redemption shall occur, (ii) the redemption date, (iii) the principal amount of
Notes to be redeemed and (iv) the redemption price.

Section 3.02. Selection of Notes to Be Redeemed.

     If less than all of the Notes are to be redeemed or purchased in an offer
to purchase at any time, the Trustee shall select the Notes to be redeemed or
purchased among the Holders of such Notes on a pro rata basis.

     The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed. Notes and portions of
Notes selected shall be in amounts of eurodollars1,000 or whole multiples of
eurodollars1,000; except that if all of the Notes of a Holder are to be
redeemed, the entire outstanding amount of Notes held by such Holder, even if
not a multiple of eurodollars1,000, shall be redeemed. Except as provided in the
preceding sentence, provisions of this Indenture that apply to Notes called for
redemption also apply to portions of Notes called for redemption.

Section 3.03. Notice of Redemption.

     Subject to the provisions of Section 3.09 hereof, at least 30 days but not
more than 60 days before a redemption date, the Company shall mail or cause to
be mailed, by first class mail, a notice of redemption to each Holder whose
Notes are to be redeemed at its registered address.

     The notice shall identify the Notes to be redeemed and shall state:

          (a) the redemption date;

          (b) the redemption price;

          (c) if any Note is being redeemed in part, the portion of the
     principal amount of such Note to be redeemed and that, after the redemption
     date upon surrender of such Note, a new Note or Notes in principal amount
     equal to the unredeemed portion shall be issued upon cancellation of the
     original Note;

          (d) the name and address of the Paying Agent;

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

          (f) that, unless the Company defaults in making such redemption
     payment, interest on Notes called for redemption ceases to accrue on and
     after the redemption date;

          (g) the paragraph of the Notes and/or Section of this Indenture
     pursuant to which the Notes called for redemption are being redeemed; and

                                      -39-
<PAGE>

          (h) that no representation is made as to the correctness or accuracy
     of the CUSIP number, if any, listed in such notice or printed on the Notes.

     At the Company's request, the Trustee shall give the notice of redemption
in the Company's name and at its expense; provided, however, that the Company
shall have delivered to the Trustee, at least 45 days prior to the redemption
date, an Officers' Certificate requesting that the Trustee give such notice and
setting forth the information to be stated in such notice as provided in the
preceding paragraph.

Section 3.04. Effect of Notice of Redemption.

     Once notice of redemption is mailed in accordance with Section 3.03 hereof,
Notes called for redemption become irrevocably due and payable on the redemption
date at the redemption price. A notice of redemption may not be conditional.

Section 3.05. Deposit of Redemption Price.

     At or prior to 10:00 a.m., New York City time, on the redemption date, the
Company shall deposit with the Trustee or with the Paying Agent money sufficient
to pay the redemption price of and accrued interest on all Notes to be redeemed
on that date. The Trustee or the Paying Agent shall promptly return to the
Company any money deposited with the Trustee or the Paying Agent by the Company
in excess of the amounts necessary to pay the redemption price of, and accrued
interest on, all Notes to be redeemed.

     If the Company complies with the provisions of the preceding paragraph, on
and after the redemption date, interest shall cease to accrue on the Notes or
the portions of Notes called for redemption. If a Note is redeemed on or after
an interest record date but on or prior to the related interest payment date,
then any accrued and unpaid interest shall be paid to the Person in whose name
such Note was registered at the close of business on such record date. If any
Note called for redemption shall not be so paid upon surrender for redemption
because of the failure of the Company to comply with the preceding paragraph,
interest shall be paid on the unpaid principal, from the redemption date until
such principal is paid, and to the extent lawful on any interest not paid on
such unpaid principal, in each case at the rate provided in the Notes and in
Section 4.01 hereof.

Section 3.06. Notes Redeemed in Part.

     Upon surrender of a Note that is redeemed in part, the Company shall issue
and, upon the Company's written request, the Trustee shall authenticate for the
Holder at the expense of the Company a new Note equal in principal amount to the
unredeemed portion of the Note surrendered.

Section 3.07. Optional Redemption.

     (a) Except as set forth in this Section 3.07, the Company shall not have
the option to redeem the Notes.

     (b) The Company may redeem the Notes in the event the Company becomes
obligated to pay any Additional Amounts as a result of a change in the laws or
regulations of Canada or any Canadian Taxing Authority, or a change in any
official position regarding the application or interpretation thereof, which is
publicly announced or becomes effective on or after the Issue Date. Upon the
occurrence of any such change, the Company may, at any time, redeem all, but not
part, of the Notes at a price equal to 100% of the principal amount thereof,
plus accrued and unpaid interest, if any, to the redemption date.

                                      -40-
<PAGE>

     At any time that the aggregate principal amount of Notes outstanding is
greater than eurodollars100.0 million, any Holder of Notes may, to the extent
that it does not adversely affect the Company's after-tax position, at its
option, waive the Company's compliance with the provisions of Section 4.05;
provided that if any Holder waives such compliance, Company may not redeem that
Holder's Notes pursuant to this Section 3.07.

     (c) Any redemption pursuant to this Section 3.07 shall be made pursuant to
the provisions of Section 3.01 through 3.06 hereof.

Section 3.08. Mandatory Redemption.

     Except as otherwise provided in Section 4.10 or Section 4.14 below, the
Company shall not be required to make mandatory redemption payments with respect
to the Notes.

Section 3.09. Offer to Purchase by Application of Excess Proceeds.

     In the event that the Company shall be required to commence an offer to all
Holders to purchase Notes and pari passu Indebtedness, including the Dollar
Notes, pursuant to Section 4.10 hereof (an "Asset Sale Offer"), it shall follow
the procedures specified below.

     The Asset Sale Offer shall remain open for a period of 20 Business Days
following its commencement and no longer, except to the extent that a longer
period is required by applicable law (the "Offer Period"). No later than five
Business Days after the termination of the Offer Period (the "Purchase Date"),
the Company shall purchase the principal amount of Notes and pari passu
Indebtedness, including the Dollar Notes, required to be purchased pursuant to
Section 4.10 hereof (the "Offer Amount") or, if less than the Offer Amount has
been tendered, all Notes and pari passu Indebtedness tendered in response to the
Asset Sale Offer. Payment for any Notes so purchased shall be made in the same
manner as interest payments are made.

     If the Purchase Date is on or after an interest record date and on or
before the related interest payment date, any accrued and unpaid interest shall
be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

     Upon the commencement of an Asset Sale Offer the Company shall send, by
first class mail, a notice to the Trustee and each of the Holders, with a copy
to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer. The Asset Sale Offer shall be made to all Holders. The notice, which
shall govern the terms of the Asset Sale Offer shall state:

          (a) that the Asset Sale Offer is being made pursuant to this Section
     3.09 and Section 4.10 hereof and the length of time the Asset Sale Offer
     shall remain open;

          (b) the Offer Amount, the purchase price and the Purchase Date;

          (c) that any Note not tendered or accepted for payment shall continue
     to accrue interest;

          (d) that, unless the Company defaults in making such payment, any Note
     accepted for payment pursuant the Asset Sale Offer shall cease to accrue
     interest after the Purchase Date;

          (e) that Holders electing to have a Note purchased pursuant to an
     Asset Sale Offer may elect to have Notes purchased in integral multiples of
     eurodollars1,000 only;

                                      -41-
<PAGE>

          (f) that Holders electing to have a Note purchased pursuant to any
     Asset Sale Offer shall be required to surrender the Note, with the form
     entitled "Option of Holder to Elect Purchase" on the reverse of the Note
     completed, or transfer by book-entry transfer, to the Company, a
     depositary, if appointed by the Company, or a Paying Agent at the address
     specified in the notice at least three days before the Purchase Date;

          (g) that Holders shall be entitled to withdraw their election if the
     Company, the depositary or the Paying Agent, as the case may be, receives,
     not later than the expiration of the Offer Period, a telegram, telex,
     facsimile transmission or letter setting forth the name of the Holder, the
     principal amount of the Note the Holder delivered for purchase and a
     statement that such Holder is withdrawing his election to have such Note
     purchased;

          (h) that, if the aggregate principal amount of Notes surrendered by
     Holders exceeds the Offer Amount, the Company shall select the Notes and
     pari passu Indebtedness, including the Dollar Notes, to be purchased on a
     pro rata basis (with such adjustments as may be deemed appropriate by the
     Company so that only Notes in denominations of eurodollars1,000, or
     integral multiples thereof, shall be purchased); and

          (i) that Holders whose Notes were purchased only in part shall be
     issued new Notes equal in principal amount to the unpurchased portion of
     the Notes surrendered (or transferred by book-entry transfer).

     On or before the Purchase Date, the Company shall, to the extent lawful,
accept for payment, on a pro rata basis to the extent necessary, the Offer
Amount of Notes and pari passu Indebtedness, including the Dollar Notes, or
portions thereof tendered pursuant to the Asset Sale Offer or if less than the
Offer Amount has been tendered, all Notes and such pari passu Indebtedness
tendered, and shall deliver to the Trustee an Officers' Certificate stating that
such Notes or portions thereof were accepted for payment by the Company in
accordance with the terms of this Section 3.09. The Company, the Depositary or
the Paying Agent, as the case may be, shall promptly (but in any case not later
than five days after the Purchase Date) mail or deliver to each tendering Holder
an amount equal to the purchase price of the Notes tendered by such Holder and
accepted by the Company for purchase, and the Company shall promptly issue a new
Note, and the Trustee, upon written request from the Company shall authenticate
and mail or deliver such new Note to such Holder, in a principal amount equal to
any unpurchased portion of the Note surrendered. Any Note not so accepted shall
be promptly mailed or delivered by the Company to the Holder thereof. The
Company shall publicly announce the results of the Asset Sale Offer on the
Purchase Date.

     Other than as specifically provided in this Section 3.09, any purchase
pursuant to this Section 3.09 shall be made pursuant to the provisions of
Sections 3.01 through 3.06 hereof.

                                    ARTICLE 4

                                    COVENANTS

Section 4.01. Payment of Notes.

     The Company shall pay or cause to be paid the principal of, premium, if
any, and interest on the Notes on the dates and in the manner provided in the
Notes. Principal, premium, if any, and interest shall be considered paid on the
date due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Luxembourg time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, and interest then due. The Company shall pay

                                      -42-
<PAGE>

all Additional Interest, if any, in the same manner on the dates and in the
amounts set forth in the Registration Rights Agreement. Whenever in this
Indenture there is mentioned, in any context, the payment of principal, premium,
if any, redemption price, Change of Control Payment, offer price and interest,
or any other amount payable under or with respect to any Note, such mention
shall be deemed to include mention of the payment of Additional Amounts to the
extent that, in such context, Additional Amounts are, were or would be payable
in respect thereof.

     The Company shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue principal at the rate equal to
1% per annum in excess of the then applicable interest rate on the Notes to the
extent lawful; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest
(without regard to any applicable grace period) at the same rate to the extent
lawful.

Section 4.02. Maintenance of Office or Agency.

     The Company shall maintain in the Borough of Manhattan, the City of New
York, an office or agency (which may be an office of the Trustee or an affiliate
of the Trustee, Registrar or co-registrar) where Notes may be surrendered for
registration of transfer or for exchange and where notices and demands to or
upon the Company in respect of the Notes and this Indenture may be served. The
Company shall give prompt written notice to the Trustee of the location, and any
change in the location, of such office or agency. If at any time the Company
shall fail to maintain any such required office or agency or shall fail to
furnish the Trustee with the address thereof, such presentations, surrenders,
notices and demands may be made or served at the Corporate Trust Office of the
Trustee.

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

     The Company hereby designates the Corporate Trust Office of the Trustee as
one such office or agency of the Company in accordance with Section 2.03.

Section 4.03. Reports.

     Whether or not required by the rules and regulations of the SEC, for so
long as any Notes remain outstanding, the Company shall furnish to the Holders
the information required to be delivered pursuant to Rule 144A(d)(4) under the
Securities Act. Whether or not the Company is subject to Section 13(a) or 15(d)
of the Exchange Act, the Company shall file with the SEC and furnish to the
Holders and the Trustee (i) within 140 days after the end of each fiscal year,
annual reports on Form 20-F or 40-F, as applicable (or any successor form),
containing the information required to be contained therein (or required in such
successor form) and (ii) (a) within 45 days after the end of each of the first
three fiscal quarters of each fiscal year, reports on Form 10-Q or (b) within 60
days after the end of each of the first three fiscal quarters of each fiscal
year, reports on Form 6-K (or any successor form) which, regardless of
applicable requirements, shall, at a minimum, contain a "Management's Discussion
and Analysis of Financial Condition and Results of Operations."

                                      -43-
<PAGE>

Section 4.04. Compliance Certificate.

     (a) The Company shall deliver to the Trustee, within 90 days after the end
of each fiscal year, an Officers' Certificate stating that a review of the
activities of the Company and its Subsidiaries during the preceding fiscal year
has been made under the supervision of the signing Officers with a view to
determining whether the Company has kept, observed, performed and fulfilled its
obligations under this Indenture, and further stating, as to each such Officer
signing such certificate, that to the best of his or her knowledge the Company
has kept, observed, performed and fulfilled each and every covenant contained in
this Indenture, including without limitation the obligations set forth in
Section 4.07, and is not in default in the performance or observance of any of
the terms, provisions and conditions of this Indenture (or, if a Default or
Event of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such event has occurred, a description of the event and what
action the Company is taking or proposes to take with respect thereto.

     (b) So long as not contrary to the then current recommendations of the
American Institute of Certified Public Accountants, the year-end financial
statements delivered pursuant to Section 4.03(a) above shall be accompanied by a
written statement of the Company's independent public accountants (who shall be
a firm of established national reputation) that in making the examination
necessary for certification of such financial statements, nothing has come to
their attention that would lead them to believe that the Company has violated
any provisions of Article 4 or Article 5 hereof or, if any such violation has
occurred, specifying the nature and period of existence thereof, it being
understood that such accountants shall not be liable directly or indirectly to
any Person for any failure to obtain knowledge of any such violation. In the
event that, after the Company has used its reasonable best efforts to obtain the
written statement of the Company's independent public accountants required by
the provisions of this paragraph, such statement cannot be obtained, the Company
shall deliver, in satisfaction of its obligations under this Section 4.04, an
Officers' Certificate (A) certifying that it has used its reasonable best
efforts to obtain such required statement but was unable to do so and (B)
attaching the written statement of the Company's accountants that the Company
received in lieu thereof.

     (c) The Company shall, so long as any of the Notes are outstanding, deliver
to the Trustee, forthwith upon any Officer becoming aware of any Default or
Event of Default, an Officers' Certificate specifying such Default or Event of
Default and what action the Company is taking or proposes to take with respect
thereto.

Section 4.05. Taxes; Payment of Additional Amounts.

     The Company shall pay, and shall cause each of its Subsidiaries to pay,
prior to delinquency, all material taxes, assessments, and governmental levies
except such as are contested in good faith and by appropriate proceedings or
where the failure to effect such payment is not adverse in any material respect
to the Holders of the Notes.

     All payments made by or on behalf of the Company on or with respect to the
Notes shall be made without withholding or deduction for any Taxes imposed by
any Canadian Taxing Authority, unless required by law or the interpretation or
administration thereof by the relevant Taxing Authority. If the Company or any
other payor is required to withhold or deduct any amount on account of Taxes
from any payment made on or with respect to the Notes, the Company shall:

          (a) make such withholding or deduction;

                                      -44-
<PAGE>

          (b) remit the full amount deducted or withheld to the relevant
     government authority in accordance with applicable law;

          (c) pay such additional amounts ("Additional Amounts") as may be
     necessary so that the net amount received by each Holder (including
     Additional Amounts) after such withholding or deduction shall not be less
     than the amount the Holder would have received if such Taxes had not been
     withheld or deducted;

          (d) furnish to the Holders, within 30 days after the date the payment
     of any Taxes is due, certified copies of tax receipts evidencing such
     payment by the Company;

          (e) indemnify and hold harmless each Holder (other than an Excluded
     Holder) for the amount of (i) any Taxes paid by such Holder as a result of
     payments made on or with respect to the Notes, (ii) any liability
     (including penalties, interest and expenses) arising therefrom or with
     respect thereto and (iii) any Taxes imposed with respect to any
     reimbursement under (i) or (ii), but excluding any such Taxes on such
     Holder's net income; and

          (f) at least 30 days prior to each date on which any Additional
     Amounts are payable, deliver to the Trustee an Officers' Certificate
     stating the amounts so payable and such other information necessary to
     enable the Trustee to pay such Additional Amounts to Holders on the payment
     date.

     Notwithstanding the foregoing, no Additional Amounts shall be payable to a
Holder in respect of a beneficial owner of a Note (an "Excluded Holder"):

          (a) with which the Company does not deal at arm's length (within the
     meaning of the Income Tax Act (Canada)) at the time of making such payment;
     or

          (b) which is subject to such Taxes by reason of its being connected
     with Canada or any province or territory thereof otherwise than by the mere
     acquisition, holding or disposition of Notes or the receipt of payments
     thereunder.

     The obligation of the Company to make payments of Additional Amounts
pursuant to this Section 4.05 shall survive any termination of this Indenture or
the defeasance of any rights under this Indenture.

Section 4.06. Stay, Extension and Usury Laws.

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

Section 4.07. Restricted Payments.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly:

          (a) declare or pay any dividend or make any other payment or
     distribution on account of the Company's or any of its Restricted
     Subsidiaries' Equity Interests (including, without limitation, any

                                      -45-
<PAGE>

     payment in connection with any merger or consolidation involving the
     Company or any of its Restricted Subsidiaries) or to the direct or indirect
     holders of the Company's or any of its Restricted Subsidiaries' Equity
     Interests in their capacity as such (other than dividends or distributions
     payable in Equity Interests (other than Disqualified Stock) of the Company
     or to the Company or a Restricted Subsidiary of the Company);

          (b) purchase, redeem or otherwise acquire or retire for value
     (including, without limitation, in connection with any merger or
     consolidation involving the Company) any Equity Interests of the Company or
     any direct or indirect parent of the Company (other than any such Equity
     Interests owned by the Company);

          (c) make any payment on or with respect to, or purchase, redeem,
     defease or otherwise acquire or retire for value any Indebtedness that is
     subordinated to the Notes, except a payment of interest or principal at the
     Stated Maturity thereof; or

          (d) make any Restricted Investment (all such payments and other
     actions set forth in clauses (a) through (d) above being collectively
     referred to as "Restricted Payments"),

unless:

          (a) at the time of and after giving effect to such Restricted Payment,
     no Default or Event of Default shall have occurred and be continuing or
     would occur as a consequence thereof; and

          (b) the Company would, at the time of such Restricted Payment and
     after giving pro forma effect thereto as if such Restricted Payment had
     been made at the beginning of the applicable four-quarter period, have been
     permitted to incur at least $1.00 of additional Indebtedness pursuant to
     clause (i) or (ii) of the first paragraph of Section 4.09; and

          (c) such Restricted Payment, together with the aggregate amount of all
     other Restricted Payments made by the Company and its Restricted
     Subsidiaries after the Issue Date (excluding Restricted Payments permitted
     by clauses (b), (c), (d), (f), (g), (h)(i), (i), (j), (k) and (m)) is less
     than the sum, without duplication, of

               (i) Consolidated Cash Flow less 1.5 times Interest Expense for
          the period (taken as one accounting period) from the Issue Date to the
          end of the Company's most recently ended fiscal quarter for which
          internal financial statements are available at the time of such
          Restricted Payment (or, if such Consolidated Cash Flow for such period
          is a deficit, less 100% of such deficit), plus

               (ii) 100% of the aggregate net cash proceeds received by the
          Company (A) since the Issue Date as a contribution to its common
          equity capital or from the issue or sale of Equity Interests of the
          Company (other than Disqualified Stock) or from the issue or sale of
          Disqualified Stock or debt securities of the Company that have been
          converted into or exchanged for such Equity Interests (other than
          Equity Interests (or Disqualified Stock or debt securities) sold to a
          Subsidiary of the Company), plus the aggregate net cash proceeds
          received by the Company upon any such conversion or exchange and (B)
          without duplication, from the sale by the Company of its Subordinate
          Voting Shares in the Concurrent Equity Offering, plus

               (iii) 100% of the net reduction in Investments on and after the
          Issue Date, resulting from payments of interest on Indebtedness,
          dividends, repayments of loan or advances, or

                                      -46-
<PAGE>

          other transfers of property (but only to the extent such interest,
          dividends, repayments or other transfers of property are not included
          in the calculation of Consolidated Net Income), in each case to the
          Company or any of its Restricted Subsidiaries from any Person
          (including, without limitation, from Unrestricted Subsidiaries of the
          Company) or from redesignations of Unrestricted Subsidiaries as
          Restricted Subsidiaries (in each case, valued as provided in the
          definition of "Investments"), not to exceed in the case of any Person
          the amount of Restricted Investments previously made by the Company or
          any of its Restricted Subsidiaries in such Unrestricted Subsidiary
          (subsequent to the Issue Date) and in each such case which was treated
          as a Restricted Payment (other than any such Restricted Payment that
          was made pursuant to the provisions of paragraph (a) through (m)
          below).

          The preceding provisions shall not prohibit:

               (a) the payment of any dividend within 60 days after the date of
          declaration thereof, if at said date of declaration such payment would
          have complied with the provisions of this Indenture;

          (b) the redemption, repurchase, retirement, defeasance or other
     acquisition of any subordinated Indebtedness of the Company or of any
     Equity Interests of the Company or any Restricted Subsidiary in exchange
     for, or out of the net cash proceeds of the substantially concurrent sale
     (other than to a Subsidiary of the Company) of, Equity Interests of the
     Company (other than Disqualified Stock); provided that the amount of any
     such net cash proceeds that are utilized for any such redemption,
     repurchase, retirement, defeasance or other acquisition shall be excluded
     from clause (c)(ii) of the preceding paragraph;

          (c) the defeasance, redemption, repurchase or other acquisition of
     subordinated Indebtedness of the Company with the net cash proceeds from an
     incurrence of Permitted Refinancing Indebtedness; provided that the amount
     of any such net cash proceeds that are utilized for any such defeasance,
     redemption, repurchase or other acquisition shall be excluded from clause
     (c)(ii) of the preceding paragraph;

          (d) Investments made out of the net cash proceeds from the issue and
     sale (other than to a Subsidiary of the Company) of Equity Interests (other
     than Disqualified Stock) of the Company; provided that the amount of any
     such net cash proceeds that are utilized for any such Investment shall be
     excluded from clause (c)(ii) of the preceding paragraph;

          (e) the repurchase, redemption or other acquisition or retirement for
     value of any Equity Interests of the Company pursuant to any management
     equity subscription agreement or stock option agreement and the repurchase
     of Equity Interests of the Company from employees, officers or directors of
     the Company or any of its Restricted Subsidiaries or their authorized
     representatives upon the death, disability or termination of employment of
     such officers, directors and employees in an aggregate amount not to exceed
     U.S. $5.0 million in any calendar year plus (i) the aggregate cash proceeds
     from any issuance during such calendar year of Equity Interests by the
     Company to employees, officers or directors of the Company and its
     Restricted Subsidiaries and (ii) the aggregate cash proceeds received by
     the Company or any of its Restricted Subsidiaries from any payments on life
     insurance policies in which the Company or any of its Restricted
     Subsidiaries is the beneficiary with respect to any employees, officers or
     directors of the Company or its Restricted Subsidiaries which proceeds are
     used to purchase Equity Interests of the Company held by any such
     employees, officers or directors;

                                      -47-
<PAGE>

          (f) Investments in Telecommunications Assets, provided that the
     aggregate fair market value of any such Investment, when taken together
     with all other Investments made pursuant to this clause (f) (measured on
     the date each such Investment was made), does not exceed U.S. $75.0
     million;

          (g) Permitted Fiber Investments in Telecommunications Assets;

          (h) Investments in any Unrestricted Subsidiary of the Company, if
     either (i) such Investment is a Permitted Project Financing Investment or
     (ii) the aggregate fair market value of any such Investment, when taken
     together with all other Investments made pursuant to this subclause h(ii)
     (measured on the date each such Investment was made), does not exceed U.S.
     $20.0 million;

          (i) Investments the payment for which consists exclusively of Equity
     Interests (other than Disqualified Stock) of the Company;

          (j) pro rata dividends or other distributions made by a Restricted
     Subsidiary of the Company to minority stockholders (or owners of an
     equivalent interest in the case of a Restricted Subsidiary that is not a
     corporation);

          (k) an Investment in any Person the primary business of which is
     Telecommunication Business in an amount not to exceed at any one time
     outstanding 20% of the Adjusted Consolidated Cash Flow, if positive,
     accrued on a cumulative basis during the period (taken as one accounting
     period) beginning on the first day of the first full fiscal quarter
     immediately following the Issue Date and ending on the last day of the last
     fiscal quarter preceding the date of such Investment;

          (l) payment when due of cash dividends on preferred stock of any
     Person that merges with or otherwise becomes a Restricted Subsidiary of the
     Company, which preferred stock is not issued in contemplation of such
     merger or other transaction, pursuant to the terms of such preferred stock
     as in effect on the date on which such Person merges with or otherwise
     becomes a Restricted Subsidiary of the Company; provided that the aggregate
     amount of cash dividends paid on any series of preferred stock so acquired
     by the Company pursuant to this clause (l) shall not exceed the aggregate
     liquidation preference of such series; and

          (m) the repurchase of Equity Interests of the Company deemed to occur
     upon the exercise of stock options if such Equity Interests represent a
     portion of the exercise price thereof;

provided, however, that at the time of, and after giving effect to, any
Restricted Payment permitted under clauses (b), (c), (d), (e), (h)(ii), (j), and
(k) above, no Default in the payment of interest on the Notes or Event of
Default exists or would occur as a consequence thereof.

     The amount of all Restricted Payments (other than cash) shall be the fair
market value on the date of the Restricted Payment of the asset(s) or securities
proposed to be transferred or issued by the Company or such Restricted
Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair
market value of any assets or securities that are required to be valued by this
covenant shall be determined by the Board of Directors whose resolution with
respect thereto shall be delivered to the Trustee. The Board of Directors'
determination must be based upon an opinion or appraisal issued by an
accounting, appraisal or investment banking firm of national standing if the
fair market value exceeds $15.0 million. No such opinion or appraisal shall be
required for any Restricted Payment made pursuant to clause (g) above. In any
year in which the Company makes one or more Restricted Payments, the Company
shall include in its compliance certificate to the Trustee pursuant to Section
4.04 hereof, a certification stating that all such Restricted Payments are, or
were, permitted by this Indenture and

                                      -48-
<PAGE>

shall set forth the basis upon which the calculations required by this Section
4.07 were computed, together with a copy of any fairness opinion or appraisal
required hereby.

Section 4.08. Dividend and Other Payment Restrictions Affecting Subsidiaries.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or permit to exist or become
effective any encumbrance or restriction on the ability of any Restricted
Subsidiary to:

          (a) pay dividends or make any other distributions on its Capital Stock
     to the Company or any of the Company's Restricted Subsidiaries, or with
     respect to any other interest or participation in, or measured by, its
     profits, or pay any Indebtedness owed to the Company or any of the
     Company's Restricted Subsidiaries;

          (b) make loans or advances to the Company or any of the Company's
     Restricted Subsidiaries; or

          (c) transfer any of its properties or assets to the Company or any of
     the Company's Restricted Subsidiaries.

     However, the preceding restrictions shall not apply to encumbrances or
restrictions existing under or by reason of:

          (a) Existing Indebtedness as in effect on the Issue Date and any
     amendments, modifications, restatements, renewals, increases, supplements,
     refundings, replacements or refinancings thereof, provided that such
     amendments, modifications, restatements, renewals, increases, supplements,
     refundings, replacement or refinancings are no more restrictive with
     respect to such dividend and other payment restrictions than those
     contained in such Existing Indebtedness, as in effect on the Issue Date;

          (b) the Credit Facilities, this Indenture, the Dollar Indenture, the
     Notes and the Exchange Notes, the Dollar Notes and the Dollar Exchange
     Notes, Qualified Subsidiary Indebtedness and Indebtedness ranking pari
     passu with the Notes; provided that with respect to Indebtedness ranking
     pari passu with the Notes such provisions are no more restrictive than
     those set forth in the Notes;

          (c) applicable law;

          (d) any instrument governing Indebtedness or Capital Stock of a Person
     acquired by the Company or any of its Restricted Subsidiaries as in effect
     at the time of such acquisition (except to the extent such Indebtedness was
     incurred in connection with or in contemplation of such acquisition), which
     encumbrance or restriction is not applicable to any Person, or the
     properties or assets of any Person, other than the Person, or the property
     or assets of the Person, so acquired; provided that, in the case of
     Indebtedness, such Indebtedness was permitted by the terms of this
     Indenture to be incurred;

          (e) customary non-assignment provisions restricting subletting or
     assignment in leases or other agreements entered into in the ordinary
     course of business and consistent with past practices;

          (f) purchase money obligations for property acquired in the ordinary
     course of business that impose restrictions on the property so acquired of
     the nature described in clause (c) of the preceding paragraph;

                                      -49-
<PAGE>

          (g) any agreement for the sale or other disposition of a Restricted
     Subsidiary that restricts distributions by such Restricted Subsidiary
     pending its sale or other disposition, provided that the consummation of
     such transaction would not result in a Default or an Event of Default, that
     such restriction terminates if such transaction is not consummated and that
     the consummation or abandonment of such transaction occurs within one year
     of the date such agreement was entered into;

          (h) Permitted Refinancing Indebtedness, provided that the restrictions
     contained in the agreements governing such Permitted Refinancing
     Indebtedness are no more restrictive than those contained in the agreements
     governing the Indebtedness being refinanced;

          (i) Liens securing Indebtedness otherwise permitted to be incurred
     pursuant to the provisions of Section 4.12 that limit the right of the
     Company or any of its Restricted Subsidiaries to dispose of the assets
     subject to such Lien;

          (j) customary limitations on the disposition or distribution of assets
     or property in joint venture agreements and other similar agreements
     entered into in the ordinary course of business; and

          (k) restrictions on cash or other deposits or net worth imposed by
     customers under contracts entered into in the ordinary course of business.

          (l) encumbrances and restrictions in Indebtedness incurred by Foreign
     Subsidiaries in accordance with Section 4.09; and

          (m) any Indebtedness or any agreement pursuant to which such
     Indebtedness was issued if (A) the encumbrance or restriction applies only
     upon a payment or financial covenant default or event of default contained
     in such Indebtedness or agreement and (B) the encumbrance or restriction is
     not materially more disadvantageous to the Holders of the Notes than is
     customary in comparable financings (as determined in good faith by the
     Board of Directors of the Company).

Section 4.09. Incurrence of Indebtedness and Issuance of Preferred Stock.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee
or otherwise become directly or indirectly liable, contingently or otherwise,
with respect to (collectively, "incur") any Indebtedness (including Acquired
Debt), and the Company shall not issue any Disqualified Stock and shall not
permit any of its Restricted Subsidiaries to issue any shares of preferred
stock; provided, however, that the Company may incur Indebtedness (including
Acquired Debt) and issue Disqualified Stock and any Restricted Subsidiary may
incur Acquired Debt, if either:

          (i) the Consolidated Leverage Ratio at the end of the Company's most
     recently ended full fiscal quarter (the "Reference Period") for which a
     consolidated balance sheet of the Company is available immediately
     preceding the date on which such additional Indebtedness is incurred or
     such Disqualified Stock is issued would have been less than 5.0 to 1.0,
     determined on a pro forma basis (including a pro forma application of the
     net proceeds therefrom), as if the additional Indebtedness had been
     incurred, or the Disqualified Stock had been issued, as the case may be, at
     the beginning of the Reference Period; or

          (ii) the Consolidated Capital Ratio at the end of the Reference Period
     would have been less than 2.0 to 1.0, determined after giving effect to the
     incurrence or issuance of such Indebtedness or Disqualified Stock and, to
     the extent set forth in the definitions used herein, on a pro forma basis

                                      -50-
<PAGE>

     (including, to the extent set forth in the definitions used herein, a pro
     forma application of the net proceeds therefrom).

     The first paragraph of this Section 4.09 shall not prohibit the incurrence
of any of the following items of Indebtedness (collectively, "Permitted Debt"):

          (a) the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness under Credit Facilities or Permitted Vendor
     Facilities; provided that the aggregate principal amount of all
     Indebtedness of the Company and its Restricted Subsidiaries outstanding
     under all Credit Facilities or Permitted Vendor Facilities after giving
     effect to such incurrence (with letters of credit being deemed to have a
     principal amount equal to the maximum potential liability of the Company
     thereunder) does not exceed an amount equal to U.S. $725.0 million less the
     aggregate amount of all Net Proceeds of Asset Sales applied by the Company
     or any of its Restricted Subsidiaries since the Issue Date to permanently
     repay Indebtedness under a Credit Facility pursuant to Section 4.10 hereof;

          (b) the incurrence by the Company and its Restricted Subsidiaries of
     Existing Indebtedness;

          (c) the incurrence by the Company of Indebtedness represented by the
     Notes, the Dollar Notes, the Exchange Notes and the Dollar Exchange Notes;

          (d) the incurrence by the Company or any of its Restricted
     Subsidiaries of Purchase Money Indebtedness and Vendor Financing
     Indebtedness provided (A) that the amount thereof does not exceed 100% of
     the Company's and its Restricted Subsidiaries' aggregate cost (determined
     in accordance with GAAP in good faith by the Board of Directors) of the
     construction, acquisition, development, engineering, installation and
     improvement of the applicable Telecommunications Assets and (B) in the case
     of the incurrence of either Purchase Money Indebtedness or Vendor Financing
     Indebtedness by a Restricted Subsidiary, such Indebtedness shall be
     Qualified Subsidiary Indebtedness;

          (e) the incurrence by the Company or any of its Restricted
     Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the
     net proceeds of which are used to refund, refinance or replace,
     Indebtedness (other than intercompany Indebtedness) that was permitted by
     this Indenture to be incurred under the first paragraph of this Section or
     clauses (b), (c), (d), (l), (n), (o) or (p) of this paragraph;

          (f) the incurrence by the Company or any of its Restricted
     Subsidiaries of intercompany Indebtedness between or among the Company and
     any of its Restricted Subsidiaries and the issuance of preferred stock by a
     Restricted Subsidiary to the Company or another Restricted Subsidiary of
     the Company; provided, however, that:

               (i) if the Company is the obligor on such Indebtedness, such
          Indebtedness must be expressly subordinated to the prior payment in
          full in cash of all Obligations with respect to the Notes; and

               (ii) (A) any subsequent issuance or transfer of Equity Interests
          that results in any such Indebtedness or preferred stock being held by
          a Person other than the Company or a Restricted Subsidiary thereof and
          (B) any sale or other transfer of any such Indebtedness or preferred
          stock to a Person that is not either the Company or a Restricted
          Subsidiary thereof; shall be deemed, in each case, to constitute an
          incurrence of such Indebtedness by the Company or such Restricted
          Subsidiary, as the case may be, that was not permitted by this clause
          (f);

                                      -51-
<PAGE>

          (g) the incurrence by the Company or any of its Restricted
     Subsidiaries of Hedging Obligations that are incurred for the purpose of
     fixing or hedging interest or foreign currency exchange rate risk with
     respect to any floating rate Indebtedness or foreign currency based
     Indebtedness, respectively, that is permitted by the terms of this
     Indenture to be outstanding; provided that the notional amount of any such
     Hedging Obligation does not exceed the amount of Indebtedness or other
     liability to which such Hedging Obligation relates; and provided further
     that such Hedging Obligations are not incurred for speculative purposes;

          (h) the guarantee by the Company or any of its Restricted Subsidiaries
     of Indebtedness of the Company or any Restricted Subsidiary of the Company
     that was permitted to be incurred by another provision of this covenant;

          (i) the accrual of interest, accretion or amortization of original
     issue discount, the payment of interest on any Indebtedness in the form of
     additional Indebtedness with the same terms, and the payment of dividends
     on Disqualified Stock in the form of additional shares of the same class of
     Disqualified Stock; provided, in each such case, that the amount thereof is
     included in Fixed Charges of the Company as accrued;

          (j) the Company and its Restricted Subsidiaries may incur Indebtedness
     solely in respect of bankers acceptances, letters of credit and performance
     bonds or similar arrangements, all in the ordinary course of business
     (other than to the extent not supporting Indebtedness);

          (k) the incurrence by the Company or any of its Restricted
     Subsidiaries arising from agreements of the Company or any of its
     Restricted Subsidiaries providing for indemnification, adjustment of
     purchase price, earn out or other similar obligation, in each case,
     incurred or assumed in connection with the disposition of any business,
     assets or Restricted Subsidiary of the Company or any of its Restricted
     Subsidiaries, other than guarantees of Indebtedness incurred by any Person
     acquiring all or any portion of such business, assets or Restricted
     Subsidiary for the purpose of financing such acquisition;

          (l) the incurrence of Indebtedness by Foreign Subsidiaries not to
     exceed U.S. $50.0 million (or the equivalent amount thereof, in other
     foreign currencies);

          (m) the incurrence by the Company or any of its Restricted
     Subsidiaries of Acquired Debt in an aggregate amount not to exceed U.S.
     $100.0 million at any time outstanding;

          (n) Indebtedness of the Company not to exceed, at any one time
     outstanding, two times the net cash proceeds received by the Company after
     the Measurement Date from the issuance and sale of its Equity Interest
     (other than Disqualified Stock) to a Person that is not a Subsidiary of the
     Company, to the extent such net cash proceeds have not been used pursuant
     to (i) clause (c)(ii) of the first paragraph of Section 4.07 or (ii)
     clauses (b) or (d) of the second paragraph of Section 4.07 to make a
     Restricted Payment; and

          (o) the incurrence by the Company or any of its Restricted
     Subsidiaries of additional Indebtedness in an aggregate principal amount
     (or accreted value, as applicable) at any time outstanding not to exceed
     U.S. $50.0 million.

     Indebtedness or preferred stock of any Person which is outstanding at the
time such Person becomes a Restricted Subsidiary of the Company (including upon
designation of any Subsidiary or other Person as a Restricted Subsidiary) or is
merged with or into or consolidated with the Company or a Restricted Subsidiary
of the

                                      -52-
<PAGE>

Company shall be deemed to have been incurred at the time such Person becomes
such a Restricted Subsidiary of the Company or is merged with or into or
consolidated with the Company or a Restricted Subsidiary of the Company, as
applicable.

     Notwithstanding any other provisions of this Section 4.09, the maximum
amount of Indebtedness that the Company or a Restricted Subsidiary may incur
shall not be deemed to be exceeded solely as a result of fluctuations in the
exchange rates of currencies.

     For purposes of determining compliance with this Section 4.09, in the event
that an item of proposed Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (a) through (p) above, or is
entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall be permitted to classify such item of Indebtedness on the date
of its incurrence, or later reclassify all or a portion of such item of
Indebtedness, in any manner that complies with this Section 4.09.

Section 4.10. Limitation on Asset Sales.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless:

          (a) the Company (or the Restricted Subsidiary, as the case may be)
     receives consideration at the time of such Asset Sale at least equal to the
     fair market value of the assets or Equity Interests issued or sold or
     otherwise disposed of;

          (b) such fair market value is determined by the Company's Board of
     Directors and evidenced by a resolution of the Board of Directors set forth
     in an Officers' Certificate delivered to the Trustee; and

          (c) at least 80% of the consideration therefor received by the Company
     or such Restricted Subsidiary is in the form of cash or Telecommunications
     Assets. For purposes of this provision, each of the following shall be
     deemed to be cash:

               (i) any liabilities (as shown on the Company's or such Restricted
          Subsidiary's most recent balance sheet), of the Company or any
          Restricted Subsidiary (other than contingent liabilities and
          liabilities that are by their terms subordinated to the Notes) that
          are assumed by the transferee of any such assets pursuant to a
          customary novation agreement that releases the Company or such
          Restricted Subsidiary from further liability;

               (ii) any securities, notes or other obligations received by the
          Company or any such Restricted Subsidiary from such transferee that
          are within 180 days converted by the Company or such Restricted
          Subsidiary into cash (to the extent of the cash received in that
          conversion); and

          (d) the Company delivers to the Trustee, with respect to any Asset
     Sale involving aggregate consideration in excess of $100.0 million, an
     opinion as to the fairness to the Company of such Asset Sale from a
     financial point of view issued by an accounting, appraisal or investment
     banking firm of national standing.

     Within 360 days after the receipt of any Net Proceeds from an Asset Sale,
the Company or such Restricted Subsidiary, as applicable, may apply such Net
Proceeds at its option:

                                      -53-
<PAGE>

          (a) to permanently repay or retire

                    (i) secured Indebtedness of the Company, including
               Indebtedness under Credit Facilities, or

                    (ii) Indebtedness of any Restricted Subsidiary of the
               Company (in each case other than any Indebtedness owed to the
               Company or any Restricted Subsidiary); or

          (b) to acquire Telecommunications Assets.

Pending the final application of any such Net Proceeds, the Company may
temporarily reduce revolving credit borrowings or otherwise invest such Net
Proceeds in any manner that is not prohibited by this Indenture.

     Any Net Proceeds from Asset Sales that are not applied or invested as
provided in the preceding paragraph shall constitute Excess Proceeds. When the
aggregate amount of Excess Proceeds exceeds $10.0 million, the Company shall
make an Asset Sale Offer to all Holders of Notes and all holders of other
Indebtedness that is pari passu with the Notes, including the Dollar Notes,
containing provisions similar to those set forth in this Indenture with respect
to offers to purchase or redeem with the proceeds of sales of assets to purchase
the maximum principal amount of Notes and such other pari passu Indebtedness
that may be purchased out of the Excess Proceeds. The offer price in any Asset
Sale Offer shall be equal to 100% of principal amount plus accrued and unpaid
interest, if any, thereon to the date of purchase and shall be payable in cash.
If any Excess Proceeds remain after consummation of an Asset Sale Offer, the
Company may use such Excess Proceeds for any purpose not otherwise prohibited by
this Indenture. If the aggregate principal amount of Notes and such other pari
passu Indebtedness tendered into such Asset Sale Offer exceeds the amount of
Excess Proceeds, the Trustee shall select the Notes to be purchased on a pro
rata basis. Upon completion of each Asset Sale Offer, the amount of Excess
Proceeds shall be reset at zero.

Section 4.11. Transactions with Affiliates.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties, assets or securities to, or purchase any
property or assets from, or enter into or make or amend any transaction,
contract, agreement, understanding, loan, advance or guarantee with, or for the
benefit of, any Affiliate (each, an "Affiliate Transaction"), unless:

          (a) such Affiliate Transaction is on terms that are no less favorable
     to the Company or the relevant Restricted Subsidiary than those that would
     have been obtained in a comparable transaction by the Company or such
     Restricted Subsidiary with a Person that is not an Affiliate; and

          (b) the Company delivers to the Trustee:

               (i) with respect to any Affiliate Transaction or series of
          related Affiliate Transactions involving aggregate consideration in
          excess of U.S. $5.0 million, a Board Resolution certifying that such
          Affiliate Transaction complies with Section 4.11 and that such
          Affiliate Transaction has been approved by a majority of the
          disinterested members of the Board of Directors and is in the best
          interests of the Company or such Restricted Subsidiary; and

               (ii) with respect to any Affiliate Transaction or series of
          related Affiliate Transactions involving aggregate consideration in
          excess of U.S. $10.0 million, an opinion as to the fairness to the
          Holders of such Affiliate Transaction from a financial point of view
          issued by an accounting, appraisal or investment banking firm of
          national standing.

                                      -54-
<PAGE>

     The following items shall not be deemed to be Affiliate Transactions and,
therefore, shall not be subject to the provisions of the prior paragraph:

          (a) reasonable fees and compensation paid to, and indemnity provided
     on behalf of, officers, directors, employees, agents or consultants of the
     Company or any of its Restricted Subsidiaries as determined in good faith
     by the Board of Directors or senior management of the Company;

          (b) transactions between or among the Company and any of the Company's
     Restricted Subsidiaries;

          (c) any sale or other issuance of Equity Interests (other than
     Disqualified Stock) of the Company;

          (d) Restricted Payments that are permitted by the provisions of
     Section 4.07 or by clauses (1), (3), (7), (8) or (9) of the definition of
     "Permitted Investments";

          (e) any agreement or arrangement as in effect on the Issue Date or any
     amendment thereto or any transaction contemplated thereby (including
     pursuant to any amendment thereto) in any replacement agreement or
     arrangement thereto so long as any such amendment or replacement agreement
     or arrangement is not more disadvantageous to the Company or its Restricted
     Subsidiaries, as the case may be, in any material respect than the original
     agreement as in effect on the Issue Date;

          (f) transactions involving aggregate consideration of up to U.S. $25.0
     million between the Company or its Restricted Subsidiaries and Ledcor Inc.
     or any of its Subsidiaries (other than the Company and its Restricted
     Subsidiaries); provided, that the Company delivers to the Trustee a Board
     Resolution stating that such Affiliate Transaction has been approved by a
     majority of the disinterested members of the Board of Directors; and

          (g) transactions with Urbanlink pertaining to the Canadian
     telecommunications arrangements consistent with the description in the
     Offering Memorandum under "Related Party Transactions -- Transactions with
     Ledcor -- Canadian telecommunications arrangements," and any contracts,
     transactions and arrangements in connection therewith.

Section 4.12. Liens.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume or suffer to
exist any Lien of any kind on any asset now owned or hereafter acquired, except
Permitted Liens, without providing that the Notes shall be secured equally and
ratably with the Indebtedness so secured for so long as such obligations are so
secured; provided that if the Indebtedness so secured is subordinated to the
Notes, the Notes shall be secured by a Lien senior to the Lien securing such
secured Indebtedness.

Section 4.13. Corporate Existence.

     Subject to Article 5 hereof, the Company shall do or cause to be done all
things necessary to preserve and keep in full force and effect (i) its corporate
existence, and the corporate, partnership or other existence of each of its
Subsidiaries, in accordance with the respective organizational documents (as the
same may be amended from time to time) of the Company or any such Subsidiary and
(ii) the rights (charter and statutory), licenses and franchises of the Company
and its Subsidiaries; provided, however, that the Company shall not be required
to preserve any such right, license or franchise, or the corporate, partnership
or other existence of any of its Subsidiaries, if the Board of Directors shall
determine that the preservation thereof is no longer desirable in

                                      -55-
<PAGE>

the conduct of the business of the Company and its Subsidiaries, taken as a
whole, and that the loss thereof is not adverse in any material respect to the
Holders of the Notes.

Section 4.14. Repurchase at the Option of Holders upon a Change of Control.

     Upon the occurrence of a Change of Control, each Holder of Notes shall have
the right to require the Company to repurchase all or any part (equal to
eurodollars1,000 or an integral multiple thereof) of that Holder's Notes
pursuant to the Change of Control Offer. In the Change of Control Offer, the
Company shall offer (the "Change of Control Offer") a payment (the "Change of
Control Payment") in cash equal to 101% of the aggregate principal amount of
Notes repurchased plus accrued and unpaid interest, if any, thereon to the date
of purchase.

     Within 20 days following any Change of Control, the Company shall mail a
notice to each Holder (with a copy to the Trustee) describing the transaction or
transactions that constitute the Change of Control and stating:

          (a) the purchase price and the purchase date, which shall not exceed
     30 Business Days from the date such notice is mailed (the "Change of
     Control Payment Date");

          (b) that any Note not tendered shall continue to accrue interest;

          (c) that, unless the Company defaults in the payment of the Change of
     Control Payment, all Notes accepted for payment pursuant to the Change of
     Control Offer shall cease to accrue interest after the Change of Control
     Payment Date;

          (d) that Holders electing to have any Notes purchased pursuant to a
     Change of Control Offer shall be required to surrender the Notes, with the
     form entitled, "Option of Holder to Elect Purchase" on the reverse of the
     Notes completed, to the Paying Agent at the address specified in the notice
     prior to the close of business on the third Business Day preceding the
     Change of Control Payment Date;

          (e) that Holders shall be entitled to withdraw their election if the
     Paying Agent receives, not later than the close of business on the second
     Business Day preceding the Change of Control Payment Date, a telegram,
     telex, facsimile transmission or letter setting forth the name of the
     Holder, the principal amount of Notes delivered for purchase, and a
     statement that such Holder is withdrawing his election to have the Notes
     purchased; and

          (f) that Holders whose Notes are being purchased only in part shall be
     issued new Notes equal in principal amount to the unpurchased portion of
     the Notes surrendered, which unpurchased portion must be equal to
     eurodollars1,000 in principal amount or an integral multiple thereof. The
     Company shall comply with the requirements of Rule 14e-1 under the Exchange
     Act and any other securities laws and regulations thereunder to the extent
     such laws and regulations are applicable in connection with the repurchase
     of the Notes as a result of a Change of Control.

     On the Change of Control Payment Date, the Company shall, to the extent
lawful:

          (a) accept for payment all Notes or portions thereof properly tendered
     pursuant to the Change of Control Offer;

          (b) deposit with the Paying Agent an amount equal to the Change of
     Control Payment plus accrued and unpaid interest, if any, thereon in
     respect of all Notes or portions thereof so tendered; and

                                      -56-
<PAGE>

          (c) deliver or cause to be delivered to the Trustee the Notes so
     accepted together with an Officers' Certificate stating the aggregate
     principal amount of Notes or portions thereof being purchased by the
     Company.

     The Paying Agent shall promptly mail to each Holder of Notes so tendered
the Change of Control Payment plus accrued and unpaid interest, if any, thereon
for such Notes, and the Trustee shall promptly authenticate and mail (or cause
to be transferred by book entry) to each Holder a new Note equal in principal
amount to any unpurchased portion of the Notes surrendered, if any; provided
that each such new Note shall be in a principal amount of eurodollars1,000 or an
integral multiple thereof. The Company shall publicly announce the results of
the Change of Control Offer on or as soon as practicable after the Change of
Control Payment Date.

     The provisions described above that require the Company to make a Change of
Control Offer following a Change of Control shall be applicable regardless of
whether or not any other provisions in this Indenture are applicable. Except as
described above with respect to a Change of Control, this Indenture does not
contain provisions that permit the Holders of the Notes to require that the
Company repurchase or redeem the Notes in the event of a takeover,
recapitalization or similar transaction.

     Notwithstanding any other provision of this Section 4.14, the Company shall
not be required to make a Change of Control Offer upon a Change of Control 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
Notes validly tendered and not withdrawn under such Change of Control Offer.

Section 4.15. No Senior Subordinated Debt.

     Notwithstanding the provisions of Section 4.09 hereof, the Company shall
not incur any Indebtedness (including Permitted Debt) that is contractually
subordinated in right of payment to any other Indebtedness of the Company unless
such Indebtedness is also contractually subordinated in right of payment to the
Notes on substantially identical terms; provided, however, that no Indebtedness
of the Company shall be deemed to be contractually subordinated in right of
payment to any other Indebtedness of the Company solely by virtue of being
unsecured.

Section 4.16. Issuances of Guarantees by Restricted Subsidiaries.

     The Company shall not permit any Restricted Subsidiary, directly or
indirectly, to guarantee, assume or in any other manner become liable with
respect to any Indebtedness of the Company which is pari passu (other than any
Indebtedness incurred under a Credit Facility) with or subordinate in right of
payment to the Notes ("Guaranteed Indebtedness"), unless (i) such Restricted
Subsidiary simultaneously executes and delivers a supplemental indenture to this
Indenture providing for a guarantee (a "Subsidiary Guarantee") of payment of the
Notes by such Restricted Subsidiary and (ii) such Restricted Subsidiary waives
and shall not in any manner whatsoever claim, or take the benefit or advantage
of, any rights of reimbursement, indemnity or subrogation or any other rights
against the Company or any other Restricted Subsidiary as a result of any
payment by such Restricted Subsidiary under its Subsidiary Guarantee; provided
that this paragraph shall not be applicable to any guarantee of any Restricted
Subsidiary that existed at the time such Person became a Restricted Subsidiary
and was not incurred in connection with, or in contemplation of, such Person
becoming a Restricted Subsidiary. If the Guaranteed Indebtedness is (A) pari
passu with the Notes, then the guarantee of such Guaranteed Indebtedness shall
be pari passu with, or subordinated to, the Subsidiary Guarantee or (B)
subordinated to the Notes, then the guarantee of such Guaranteed Indebtedness
shall be subordinated to the Subsidiary Guarantee at least to the extent that
the Guaranteed Indebtedness is subordinated to the Notes.

                                      -57-
<PAGE>

     Notwithstanding the foregoing, any Subsidiary Guarantee by a Restricted
Subsidiary may provide by its terms that it shall be automatically and
unconditionally released and discharged upon (i) any sale, exchange or transfer,
to any Person that is not an Affiliate of the Company, of all of the Company's
and each Restricted Subsidiary's Capital Stock in, or all or substantially all
of the assets of, such Restricted Subsidiary (which sale, exchange or transfer
is not prohibited by this Indenture) or (ii) the release or discharge of the
guarantee which resulted in the creation of such Subsidiary Guarantee, except a
discharge or release by or as a result of payment under such guarantee.

Section 4.17. Designation of Restricted and Unrestricted Subsidiaries.

     The Board of Directors may designate any Restricted Subsidiary to be an
Unrestricted Subsidiary if that designation would not cause a Default. If a
Restricted Subsidiary is designated as an Unrestricted Subsidiary, all
outstanding Investments owned by the Company and its Restricted Subsidiaries in
the Subsidiary so designated shall be deemed to be an Investment made as of the
time of such designation and shall reduce the amount available for Restricted
Payments under the first paragraph of Section 4.07. All such outstanding
Investments shall be valued at their fair market value at the time of such
designation; provided that any determination of fair market value equal to or
greater than U.S. $100.0 million shall be determined by an independent
accounting, appraisal or investment banking firm of national standing. That
designation shall only be permitted if such Restricted Payment would be
permitted at that time and if such Restricted Subsidiary otherwise meets the
definition of an Unrestricted Subsidiary. The Board of Directors may redesignate
any Unrestricted Subsidiary to be a Restricted Subsidiary if the redesignation
would not cause a Default and such redesignation shall increase the amount
available for Restricted Payments under the first paragraph of Section 4.07 as
provided therein or Permitted Investments, as applicable.

     As of the date hereof, all of the Company's subsidiaries other than the
Hibernia Subsidiaries are Restricted Subsidiaries.

Section 4.18. Payments for Consent.

     The Company shall not, and shall not permit any of its Subsidiaries to,
directly or indirectly, pay or cause to be paid any consideration to or for the
benefit of any Holder of Notes for or as an inducement to any consent, waiver or
amendment of any of the terms or provisions of this Indenture or the Notes
unless such consideration is offered to be paid and is paid to all Holders of
the Notes that consent, waive or agree to amend in the time frame set forth in
the solicitation documents relating to such consent, waiver or agreement.

Section 4.19. Business Activities.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, engage to any material extent in any business other than the
Telecommunications Business.

                                    ARTICLE 5

                                   SUCCESSORS

Section 5.01. Amalgamation, Merger, Consolidation, or Sale of Assets.

     The Company shall not, directly or indirectly: (1) amalgamate or
consolidate or merge with or into (whether or not the Company is the surviving
corporation); or (2) or sell, assign, transfer, convey or otherwise dispose of
all or substantially all of its properties or assets in one or more related
transactions to, another Person; unless:

                                      -58-
<PAGE>

          (a) either: (i) the Company is the surviving corporation; or (ii) the
     Person formed by or surviving any such amalgamation, consolidation or
     merger (if other than the Company) or to which such sale, assignment,
     transfer, conveyance or other disposition shall have been made is a
     corporation organized or existing under the laws of Canada or any province
     thereof or the United States, any state thereof or the District of
     Columbia;

          (b) the Person formed by or surviving any such amalgamation,
     consolidation or merger (if other than the Company) or the Person to which
     such sale, assignment, transfer, conveyance or other disposition shall have
     been made assumes all the obligations of the Company under the Notes, the
     Exchange Notes, this Indenture and the Registration Rights Agreement
     pursuant to agreements reasonably satisfactory to the Trustee;

          (c) no Default or Event of Default (or an event that, with the passing
     of time or giving of notice or both, would constitute an Event of Default)
     shall exist or shall occur immediately after giving effect on a pro forma
     basis to such transaction;

          (d) the Company or the Person formed or surviving any such
     amalgamation, consolidation or merger (if other than the Company) or to
     which such sale, assignment, transfer, conveyance or other disposition has
     been made will, on the date of such transaction after giving pro forma
     effect thereto and any related financing transactions as if the same had
     occurred at the beginning of the applicable Reference Period, be permitted
     to incur at least U.S. $1.00 of additional Indebtedness pursuant to the
     Consolidated Leverage Ratio test or the Consolidated Capital Ratio test set
     forth in the first paragraph of Section 4.09;

          (e) the transaction shall not result in the Company or the Person
     formed by or surviving any such amalgamation, consolidation or merger (if
     other than the Company) being required to make any deduction or withholding
     on account of Taxes as described under Section 3.07(c) and Section 4.05
     from any payment under or in respect of the Notes that the Company would
     not have been required to make had such transaction or series of related
     transactions not occurred; and

          (f) the Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that such amalgamation,
     consolidation, merger or transfer and such supplemental indenture, if any,
     comply with this Indenture.

     In addition, the Company may not, directly or indirectly, lease all or
substantially all of its properties or assets, in one or more related
transactions, to any other Person. For purposes of the foregoing, the transfer
(by assignment, sale or otherwise) of all or substantially all of the properties
and assets of one or more Subsidiaries, the Company's interest in which
constitutes all or substantially all of the properties and assets of the
Company, shall be deemed to be the transfer of all or substantially all of the
properties and assets of the Company. The provisions of this Section 5.01 shall
not apply to a sale, assignment, transfer, conveyance or other disposition of
assets between or among the Company and any of its Wholly-Owned Restricted
Subsidiaries.

Section 5.02. Successor Corporation Substituted.

     Upon any amalgamation, consolidation or merger or any sale, assignment,
transfer, lease, conveyance or other disposition of all or substantially all of
the assets of the Company in accordance with Section 5.01, the successor
corporation formed by such amalgamation or consolidation or into which the
Company is merged or to which such transfer is made shall succeed to and (except
in the case of a lease) be substituted for, and may exercise every right and
power of, the Company under this Indenture with the same effect as if such
successor corporation had been named therein as the Company, and (except in the
case of a lease) the Company shall be released from the obliga-

                                      -59-
<PAGE>

tions under the Notes, and this Indenture except with respect to any obligations
that arise from, or are related to, such transaction.

                                    ARTICLE 6

                              DEFAULTS AND REMEDIES

Section 6.01. Events of Default.

     An "Event of Default" occurs if:

          (a) the Company defaults in the payment when due of interest on, or
     Additional Amounts, if any, with respect to, the Notes and such default
     continues for a period of 30 days;

          (b) the Company defaults in the payment when due of principal of or
     premium, if any, on the Notes;

          (c) the Company or any of its Restricted Subsidiaries fails to comply
     with any of the provisions of Article 5 hereof, or any of the provisions of
     Sections 4.07, 4.09 or 4.11;

          (d) the Company or any of its Restricted Subsidiaries fails to observe
     or perform any of the provisions of Sections 4.10 and 4.14 for 15 days
     after notice to the Company by the Trustee or to the Company and the
     Trustee by the Holders of at least 25% of the aggregate principal amount of
     the Notes (including Additional Senior Notes, if any) then outstanding;

          (e) the Company or any of its Restricted Subsidiaries fails to observe
     or perform any other covenant, representation, warranty or other agreement
     in this Indenture or the Notes for 60 days after notice to the Company by
     the Trustee or to the Company and the Trustee by the Holders of at least
     25% of the aggregate principal amount of the Notes then outstanding;

          (f) the Company voluntarily relinquishes any of its rights under the
     Non-Competition Agreement or fails for 30 days after written notice thereof
     has been given to the Company by the Trustee or to the Company and the
     Trustee by the Holders of at least 25% in aggregate principal amount of the
     Notes then outstanding to enforce any of such rights, in each case which is
     materially detrimental to the interests of the Company or the Holders;

          (g) the Company defaults under any mortgage, indenture or instrument
     under which there may be issued or by which there may be secured or
     evidenced any Indebtedness for money borrowed (or the payment of which is
     guaranteed by the Company or any of its Restricted Subsidiaries) whether
     such Indebtedness or guarantee now exists, or is created after the date of
     the Indenture, if that default:

               (i) is caused by a failure to pay principal of or premium, if
          any, on such Indebtedness prior to the expiration of the grace period
          provided in such Indebtedness on the date of such default (a "Payment
          Default"); or

               (ii) results in the acceleration of such Indebtedness prior to
          its express maturity, and, in each case, the principal amount of any
          such Indebtedness, together with the principal amount of any other
          such Indebtedness under which there has been a Payment Default or the
          maturity of which has been so accelerated, aggregates U.S. $10.0
          million or more;

                                      -60-
<PAGE>

          (h) the Company or any of its Restricted Subsidiaries fails to pay
     final judgments which are non-appealable aggregating in excess of U.S.
     $10.0 million (net of applicable insurance coverage which is acknowledged
     in writing by the insurer), which judgments are not paid, discharged or
     stayed for a period of 60 days; and

          (i) the Company or any of its Restricted Subsidiaries pursuant to or
     within the meaning of Bankruptcy Law:

               (i) commences a voluntary case,

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

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

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

               (v) generally is not paying its debts as they become due; or

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

               (i) is for relief against the Company or any of its Restricted
          Subsidiaries in an involuntary case;

               (ii) appoints a custodian of the Company or any of its Restricted
          Subsidiaries or for all or substantially all of the property of the
          Company or any of its Restricted Subsidiaries; or

               (iii) orders the liquidation of the Company or any of its
          Restricted Subsidiaries;

and the order or decree remains unstayed and in effect for 60 consecutive days.

Section 6.02. Acceleration.

     If any Event of Default (other than an Event of Default specified in clause
(i) or (j) of Section 6.01 hereof with respect to the Company, any Restricted
Subsidiary that is a Significant Subsidiary or any group of Restricted
Subsidiaries that, taken together, would constitute a Significant Subsidiary)
occurs and is continuing, the Trustee by notice to the Company or the Holders of
at least 25% in principal amount of the then outstanding Notes by notice to the
Company and the Trustee may declare all the Notes to be due and payable
immediately.

     Notwithstanding the foregoing, if an Event of Default specified in clause
(i) or (j) of Section 6.01 hereof occurs with respect to the Company, any
Restricted Subsidiary that is a Significant Subsidiary or any group of
Restricted Subsidiaries that, taken together, would constitute a Significant
Subsidiary, all outstanding Notes shall be due and payable immediately without
further action or notice. The Holders of a majority in aggregate principal
amount of the then outstanding Notes by written notice to the Trustee may on
behalf of all of the Holders rescind an acceleration and its consequences if the
rescission would not conflict with any judgment or decree and if all existing
Events of Default (except nonpayment of principal, interest or premium that has
become due solely because of the acceleration) have been cured or waived.

                                      -61-
<PAGE>

Section 6.03. Other Remedies.

     If an Event of Default occurs and is continuing, the Trustee may pursue any
available remedy to collect the payment of principal, premium, if any, and
interest on the Notes or to enforce the performance of any provision of the
Notes or this Indenture.

     The Trustee may maintain a proceeding even if it does not possess any of
the Notes or does not produce any of them in the proceeding. A delay or omission
by the Trustee or any Holder of a Note in exercising any right or remedy
accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default. All remedies are
cumulative to the extent permitted by law.

Section 6.04. Waiver of Past Defaults.

     Subject to Section 6.02, Holders of not less than a majority in aggregate
principal amount of the then outstanding Notes by notice to the Trustee may on
behalf of the Holders of all of the Notes waive an existing Default or Event of
Default and its consequences hereunder, except a continuing Default or Event of
Default in the payment of the principal of, premium, if any, or interest on, the
Notes (including in connection with an offer to purchase) (provided, however,
that the Holders of a majority in aggregate principal amount of the then
outstanding Notes may rescind an acceleration and its consequences, including
any related payment default that resulted from such acceleration). 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 6.05. Control by Majority.

     Holders of a majority in principal amount of the then outstanding Notes may
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 it. However, the Trustee may refuse to follow any direction that conflicts
with law or this Indenture that the Trustee determines may be unduly prejudicial
to the rights of other Holders of Notes or that may involve the Trustee in
personal liability. The Trustee may take any other action which it deems proper
that is not inconsistent with any such directive.

Section 6.06. Limitation on Suits.

     A Holder of a Note may pursue a remedy with respect to this Indenture or
the Notes only if:

          (a) the Holder of a Note gives to the Trustee written notice of a
     continuing Event of Default;

          (b) the Holders of at least 25% in principal amount of the then
     outstanding Notes make a written request to the Trustee to pursue the
     remedy;

          (c) such Holder of a Note or Holders of Notes offer and, if requested,
     provide to the Trustee indemnity satisfactory to the Trustee against any
     loss, liability or expense;

          (d) the Trustee does not comply with the request within 60 days after
     receipt of the request and the offer and, if requested, the provision of
     indemnity; and

          (e) during such 60-day period the Holders of a majority in principal
     amount of the then outstanding Notes do not give the Trustee a direction
     inconsistent with the request.

                                      -62-
<PAGE>

     A Holder of a Note may not use this Indenture to prejudice the rights of
another Holder of a Note or to obtain a preference or priority over another
Holder of a Note.

Section 6.07. Rights of Holders of Notes to Receive Payment.

     Notwithstanding any other provision of this Indenture, the right of any
Holder of a Note to receive payment of principal, premium, if any, and interest
on the Note, on or after the respective due dates expressed in the Note
(including in connection with an offer to purchase), or to bring suit for the
enforcement of any such payment on or after such respective dates, shall not be
impaired or affected without the consent of such Holder.

Section 6.08. Collection Suit by Trustee.

     If an Event of Default specified in Section 6.01(a) or (b) occurs and is
continuing, the Trustee is authorized to recover judgment in its own name and as
trustee of an express trust against the Company for the whole amount of
principal of, premium, if any, and interest remaining unpaid on the Notes and
interest on overdue principal and, to the extent lawful, interest and 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.

Section 6.09. Trustee May File Proofs of Claim.

     The Trustee is authorized to file such proofs of claim and 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 the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount due to
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 7.07 hereof. To the extent that the payment of any such compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof out of the estate in
any such proceeding, shall be denied for any reason, payment of the same shall
be secured by a Lien on, and shall be paid out of, any and all distributions,
dividends, money, securities and other properties that the Holders may be
entitled to receive in such proceeding whether in liquidation or under any plan
of reorganization or arrangement or otherwise. 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, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

Section 6.10. Priorities.

     If the Trustee collects any money pursuant to this Article, it shall pay
out the money in the following order:

          First: to the Trustee, its agents and attorneys for amounts due under
     Section 7.07 hereof, including payment of all compensation, expense and
     liabilities incurred, and all advances made, by the Trustee and the costs
     and expenses of collection;

                                      -63-
<PAGE>

          Second: to Holders of Notes for amounts due and unpaid on the Notes
     for principal, premium, if any, and interest, ratably, without preference
     or priority of any kind, according to the amounts due and payable on the
     Notes for principal, premium, if any and interest, respectively; and

          Third: to the Company or to such party as a court of competent
     jurisdiction shall direct.

     The Trustee may fix a record date and payment date for any payment to
Holders of Notes pursuant to this Section 6.10.

Section 6.11. Undertaking for Costs.

     In any suit for the enforcement of any right or remedy under this Indenture
or in any suit against the Trustee for any action taken or omitted by it as a
Trustee, a court in its discretion may require the filing by any party litigant
in the suit of an undertaking to pay the costs of the suit, and the court in its
discretion may assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in the suit, having due regard to the merits and good
faith of the claims or defenses made by the party litigant. This Section does
not apply to a suit by the Trustee, a suit by a Holder of a Note pursuant to
Section 6.07 hereof, or a suit by Holders of more than 10% in principal amount
of the then outstanding Notes.

Section 6.12. Indemnification for Judgment Currency Fluctuations.

     The obligations of the Company to any Holder of Notes shall,
notwithstanding any judgment in a currency (the "Judgment Currency") other than
euros (the "Agreement Currency"), be discharged only to the extent that on the
day following receipt by such Holder of Notes or the Trustee, as the case may
be, of any amount in the Judgment Currency, such Holder of Notes may in
accordance with normal banking procedures purchase the Agreement Currency with
the Judgment Currency. If the amount of the Agreement Currency so purchased is
less than the amount originally to be paid to such Holder of Notes or the
Trustee, as the case may be, in the Agreement Currency, the Company shall pay
the difference and if the amount of the Agreement Currency so purchased exceeds
the amount originally to be paid to such Holder of Notes or the Trustee, as the
case may be, such Holder of Notes or the Trustee, as the case may be, shall pay
to or for the account of the Company such excess, provided that such Holder of
Notes or the Trustee, as the case may be, shall not have any obligation to pay
any such excess as long as a Default by the Company in its obligations under the
Notes or this Indenture has occurred and is continuing, in which case such
excess may be applied by such Holder of Notes to such obligations.

                                    ARTICLE 7

                                     TRUSTEE

Section 7.01. Duties of Trustee.

     (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, as a prudent person would
exercise or use under the circumstances in the conduct of such person's own
affairs.

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

          (i) the duties of the Trustee shall be determined solely by the
     express provisions of this Indenture and the Trustee need perform only
     those duties that are specifically set forth in this Indenture and no
     others, and no implied covenants or obligations shall be read into this
     Indenture against the Trustee; and

                                      -64-
<PAGE>

          (ii) in the absence of bad faith on its part, the Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon certificates or opinions furnished to
     the Trustee and conforming to the requirements of this Indenture. However,
     the Trustee shall examine the certificates and opinions to determine
     whether or not they conform to the requirements of this Indenture.

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

          (i) this paragraph does not limit the effect of paragraph (b) of this
     Section;

          (ii) the Trustee shall not be liable for 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

          (iii) 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
     received by it pursuant to Section 6.05 hereof.

     (d) Whether or not therein expressly so provided, every provision of this
Indenture that in any way relates to the Trustee is subject to paragraphs (a),
(b), and (c) of this Section.

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

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

Section 7.02. Rights of Trustee.

     (a) The Trustee may conclusively rely upon any document believed by it to
be genuine and to have been signed or presented by the proper Person. The
Trustee need not investigate any fact or matter stated in the document.

     (b) Before the Trustee acts or refrains from acting, it may require an
Officers' 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 in reliance on
such Officers' Certificate or Opinion of Counsel. The Trustee may consult with
counsel and the written advice of such counsel or any Opinion of Counsel shall
be full and complete authorization and protection from liability in respect of
any action taken, suffered or omitted by it hereunder in good faith and in
reliance thereon.

     (c) The Trustee may act through its attorneys and agents and shall not be
responsible for the misconduct or negligence of any agent appointed with due
care.

     (d) The Trustee shall not be liable for any action it takes or omits to
take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture.

                                      -65-
<PAGE>

     (e) Unless otherwise specifically provided in this Indenture, any demand,
request, direction or notice from the Company shall be sufficient if signed by
an Officer of the Company.

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

     (g) The Trustee shall not be charged with knowledge of any Default or Event
of Default with respect to the Notes unless either (1) a Responsible Officer of
the Trustee assigned to the Corporate Trust Office of the Trustee (or any
successor division or office) shall have actual knowledge of such Default or
Event of Default or (2) written notice of such Default or Event of Default shall
have been given to the Trustee by the Company or any other obligor on the Notes
or by any Holder of the Notes

Section 7.03. Individual Rights of Trustee.

     The Trustee in its individual or any other capacity may become the owner or
pledgee of Notes and may otherwise deal with the Company or any Affiliate of the
Company with the same rights it would have if it were not Trustee. However, in
the event that the Trustee acquires any conflicting interest it must eliminate
such conflict within 90 days, apply to the SEC for permission to continue as
trustee or resign. Any Agent may do the same with like rights and duties. The
Trustee is also subject to Sections 7.10 and 7.11 hereof.

Section 7.04. Trustee's Disclaimer.

     The Trustee shall not be responsible for and makes no representation as to
the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

Section 7.05. Notice of Defaults.

     If a Default or Event of Default occurs and is continuing and if it is
known to the Trustee, the Trustee shall mail to Holders of Notes a notice of the
Default or Event of Default within 90 days after it occurs. Except in the case
of a Default or Event of Default in payment of principal of, premium, if any, or
interest on any Note, the Trustee may withhold the notice if and so long as a
committee of its Responsible Officers in good faith determines that withholding
the notice is in the interests of the Holders of the Notes.

Section 7.06. Reports by Trustee to Holders of the Notes.

     Within 60 days after each May 15 beginning with the May 15 following the
date of this Indenture, and for so long as Notes remain outstanding, the Trustee
shall mail to the Holders of the Notes a brief report dated as of such reporting
date that complies with TIA ss. 313(a) (but if no event described in TIA ss.
313(a) has occurred within the twelve months preceding the reporting date, no
report need be transmitted). The Trustee also shall comply with TIA ss.
313(b)(2). The Trustee shall also transmit by mail all reports as required by
TIA ss. 313(c).

                                      -66-
<PAGE>

     A copy of each report at the time of its mailing to the Holders of Notes
shall be mailed to the Company and filed with the SEC and each stock exchange on
which the Notes are listed in accordance with TIA ss. 313(d). The Company shall
promptly notify the Trustee when the Notes are listed on any stock exchange.

Section 7.07. Compensation and Indemnity.

     The Company shall pay to the Trustee from time to time reasonable
compensation for its acceptance of this Indenture and services hereunder. The
Trustee's compensation shall not be limited by any law on compensation of a
trustee of an express trust. The Company shall reimburse the Trustee promptly
upon request for all reasonable disbursements, advances and expenses incurred or
made by it in addition to the compensation for its services. Such expenses shall
include the reasonable compensation, disbursements and expenses of the Trustee's
agents and counsel.

     The Company shall indemnify the Trustee against any and all losses,
liabilities or expenses incurred by it arising out of or in connection with the
acceptance or administration of its duties under this Indenture, including the
costs and expenses of enforcing this Indenture against the Company (including
this Section 7.07) and defending itself against any claim (whether asserted by
the Company or any Holder or any other person) or liability in connection with
the exercise or performance of any of its powers or duties hereunder, except to
the extent any such loss, liability or expense may be attributable to its
negligence or bad faith. The Trustee shall notify the Company promptly of any
claim for which it may seek indemnity. Failure by the Trustee to so notify the
Company shall not relieve the Company of its obligations hereunder. The Company
shall defend the claim and the Trustee shall cooperate in the defense. The
Trustee may have separate counsel and the Company shall pay the reasonable fees
and expenses of such counsel. The Company need not pay for any settlement made
without its consent, which consent shall not be unreasonably withheld.

     The obligations of the Company under this Section 7.07 shall survive
resignation or removal of the Trustee and the satisfaction and discharge of this
Indenture.

     To secure the Company's payment obligations in this Section, the Trustee
shall have a Lien prior to the Notes on all money or property held or collected
by the Trustee, except that held in trust to pay principal and interest on
particular Notes. Such Lien shall survive the resignation or removal of the
Trustee and the satisfaction and discharge of this Indenture.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(i) or (j) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

     The Trustee shall comply with the provisions of TIA ss. 313(b)(2) to the
extent applicable.

Section 7.08. Replacement of Trustee.

     A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section.

     The Trustee may resign in writing at any time and be discharged from the
trust hereby created by so notifying the Company. The Holders of a majority in
principal amount of the then outstanding Notes may remove the Trustee by so
notifying the Trustee and the Company in writing. The Company may remove the
Trustee if:

          (a) the Trustee fails to comply with Section 7.10 hereof;

                                      -67-
<PAGE>

          (b) the Trustee is adjudged a bankrupt or an insolvent or an order for
     relief is entered with respect to the Trustee under any Bankruptcy Law;

          (c) a custodian or public officer takes charge of the Trustee or its
     property; or

          (d) the Trustee becomes incapable of acting.

     If the Trustee resigns or is removed or if a vacancy exists in the office
of Trustee for any reason, the Company shall promptly appoint a successor
Trustee. Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount of the then outstanding Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

     If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company, or
the Holders of at least 10% in principal amount of the then outstanding Notes
may petition any court of competent jurisdiction for the appointment of a
successor Trustee.

     If the Trustee, after written request by any Holder who has been a Holder
for at least six months, fails to comply with Section 7.10, such Holder may
petition any court of competent jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee.

     A successor Trustee shall deliver a written acceptance of its appointment
to the retiring Trustee and to the Company. Thereupon, the resignation or
removal of the retiring Trustee shall become effective, and the successor
Trustee shall have all the rights, powers and duties of the Trustee under this
Indenture. The successor Trustee shall mail a notice of its succession to
Holders. The retiring Trustee shall promptly transfer all property held by it as
Trustee to the successor Trustee, provided all sums owing to the Trustee
hereunder have been paid and subject to the Lien provided for in Section 7.07
hereof. Notwithstanding replacement of the Trustee pursuant to this Section
7.08, the Company's obligations under Section 7.07 hereof shall continue for the
benefit of the retiring Trustee.

Section 7.09. Successor Trustee by Merger, etc.

     If the Trustee consolidates, merges or converts into, or transfers all or
substantially all of its corporate trust business to, another corporation, the
successor corporation without any further act shall be the successor Trustee.

Section 7.10. Eligibility; Disqualification.

     There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least U.S. $100
million as set forth in its most recent published annual report of condition.

     This Indenture shall always have a Trustee who satisfies the requirements
of TIA ss. 310(a)(1), (2) and (5). The Trustee is subject to TIA ss. 310(b).

Section 7.11. Preferential Collection of Claims Against Company.

     The Trustee is subject to TIA ss. 311(a), excluding any creditor
relationship listed in TIA ss. 311(b). A Trustee who has resigned or been
removed shall be subject to TIA ss. 311(a) to the extent indicated therein.

                                      -69-
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                                    ARTICLE 8

                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01. Option to Effect Legal Defeasance or Covenant Defeasance.

     The Company may, at the option of the Board of Directors evidenced by a
Board Resolution, at any time, elect to have either Section 8.02 or 8.03 hereof
be applied to all outstanding Notes upon compliance with the conditions set
forth below in this Article Eight.

Section 8.02. Legal Defeasance and Discharge.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under the Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder:

          (a) the rights of Holders of outstanding Notes to receive payments in
     respect of the principal of, premium, if any, and interest on the Notes
     when such payments are due from the trust referred to below;

          (b) the Company's obligations with respect to the Notes concerning
     issuing temporary Notes, registration of Notes, mutilated, destroyed, lost
     or stolen Notes and the maintenance of an office or agency for payment and
     money for security payments held in trust;

          (c) the rights, powers, trusts, duties and immunities of the Trustee,
     and the Company's obligations in connection therewith;

          (d) the Legal Defeasance provisions of this Indenture; and

          (e) the Company's obligation to pay Additional Amounts.

     Subject to compliance with this Article Eight, the Company may exercise its
option under this Section 8.02 notwithstanding the prior exercise of its option
under Section 8.03 hereof.

Section 8.03. Covenant Defeasance.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under the covenants contained in Article 5 and Sections 4.03, 4.07,
4.08, 4.09, 4.10, 4.11, 4.12, 4.14, 4.15 and 4.16 hereof with respect to the
outstanding Notes on and after the date the conditions set forth in Section 8.04
are satisfied (hereinafter, "Covenant Defeasance"), and the Notes shall
thereafter be deemed 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

                                      -69-
<PAGE>

other purposes hereunder (it being understood that such Notes shall not be
deemed outstanding for accounting purposes). For this purpose, Covenant
Defeasance means that, with respect to the outstanding Notes, the Company may
omit to comply with and shall have no liability in respect of any term,
condition or limitation set forth in any such covenant, whether directly or
indirectly, by reason of any reference elsewhere herein to any such covenant or
by reason of any reference in any such covenant to any other provision herein or
in any other document and such omission to comply shall not constitute a Default
or an Event of Default under Section 6.01 hereof, but, except as specified
above, the remainder of this Indenture and such Notes shall be unaffected
thereby. In addition, upon the Company's exercise under Section 8.01 hereof of
the option applicable to this Section 8.03 hereof, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, Sections 6.01(c) through
6.01(e) hereof and Section 6.01(g) hereof shall not constitute Events of
Default.

Section 8.04. Conditions to Legal or Covenant Defeasance.

     The following shall be the conditions to the application of either Section
8.02 or 8.03 hereof to the outstanding Notes:

     In order to exercise either Legal Defeasance or Covenant Defeasance:

          (a) the Company must irrevocably deposit with the Trustee, in trust,
     for the benefit of the Holders of the Notes, cash in legal tender in the
     countries constituting the European Monetary Union or EEA Government
     Obligations, or a combination thereof in such amounts as shall be
     sufficient, in the opinion of a nationally recognized firm of independent
     public accountants, to pay the principal of, premium, if any, and interest
     on the outstanding Notes on the stated maturity or on the applicable
     redemption date, as the case may be, and the Company must specify whether
     the Notes are being defeased to maturity or to a particular redemption
     date;

          (b) in the case of an election under Section 8.02 hereof, the Company
     shall have delivered to the Trustee an Opinion of Counsel reasonably
     acceptable to the Trustee confirming that (a) the Company has received
     from, or there has been published by, the Internal Revenue Service a ruling
     or (b) since the Issue Date, 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 Counsel shall confirm that, the Holders of the
     outstanding Notes shall not recognize income, gain or loss for United
     States federal income tax purposes as a result of such Legal Defeasance and
     shall be subject to United States federal income tax on the same amounts,
     in the same manner and at the same times as would have been the case if
     such Legal Defeasance had not occurred and the Company shall have delivered
     to the Trustee an Opinion of Counsel in Canada reasonably acceptable to the
     Trustee confirming that the Holders of the outstanding Notes shall not
     recognize income, gain or loss for Canadian federal income tax purposes as
     a result of such Legal Defeasance and shall be subject to Canadian federal
     income tax on the same amounts, in the same manner and at the same times as
     would have been the case if such Legal Defeasance had not occurred;

          (c) in the case of an election under Section 8.03 hereof, the Company
     shall have delivered to the Trustee an Opinion of Counsel reasonably
     acceptable to the Trustee confirming that the Holders of the outstanding
     Notes shall not recognize income, gain or loss for United States federal
     income tax purposes as a result of such Covenant Defeasance and shall be
     subject to United States 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 and the Company shall have delivered
     to the Trustee an Opinion of Counsel in Canada reasonably acceptable to the
     Trustee confirming that the Holders of the outstanding Notes shall not
     recognize income, gain or loss for Canadian federal income tax purposes as
     a result of such Covenant Defeasance and shall be subject to Canadian
     federal income tax on the same amounts,

                                      -70-
<PAGE>

     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 shall have occurred and be
     continuing on the date of such deposit (other than a Default or Event of
     Default resulting from the borrowing of funds to be applied to such
     deposit);

          (e) such Legal Defeasance or Covenant Defeasance shall not result in a
     breach or violation of, or constitute a default under, any material
     agreement or instrument (other than this Indenture) to which the Company or
     any of its Restricted Subsidiaries is a party or by which the Company or
     any of its Restricted Subsidiaries is bound;

          (f) 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 over any other creditors of the Company or
     with the intent of defeating, hindering, delaying or defrauding creditors
     of the Company or others; and

          (g) the Company shall have delivered to the Trustee an Officers'
     Certificate and an opinion of counsel, in the case of the Officers'
     Certificate, stating that all conditions precedent relating to the Legal
     Defeasance or the Covenant Defeasance have been complied with and, in the
     case of the opinion of counsel, that the conditions precedent in clauses
     (a) (with respect to the validity and perfection of the security interest),
     (b), (c) and (e) have been complied with and that the trust referred to in
     clause (a) will not be required to register under the Investment Company
     Act of 1940.

Section 8.05. Deposited Money and Government Securities to be Held in Trust;
              Other Miscellaneous Provisions.

     Subject to Section 8.06 hereof, all money and non-callable EEA Government
Obligations (including the proceeds thereof) deposited with the Trustee (or
other qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding 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 (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of the 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 cash or non-callable EEA
Government Obligations deposited pursuant to Section 8.04 hereof or the
principal and interest received in respect thereof other than any such tax, fee
or other charge which by law is for the account of the Holders of the
outstanding Notes.

     Anything in this Article Eight to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon the request of the
Company any money or non-callable EEA Government Obligations held by it as
provided in Section 8.04 hereof which, in the opinion of a nationally recognized
firm of independent public accountants expressed in a written certification
thereof delivered to the Trustee (which may be the opinion delivered under
Section 8.04(a) hereof), are in excess of the amount thereof that would then be
required to be deposited to effect an equivalent Legal Defeasance or Covenant
Defeasance.

                                      -71-
<PAGE>

Section 8.06. Repayment to Company.

     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 be paid to the
Company on its request or (if then held by the Company) shall be discharged from
such trust; and the Holder of such Note shall thereafter look only to the
Company for payment thereof, and all liability of the Trustee or such Paying
Agent with respect to such trust money, and all liability of the Company as
trustee thereof, shall thereupon cease; provided, however, that the Trustee or
such Paying Agent, before being required to make any such repayment, may at the
expense of the Company cause to be published once, in the Luxemburger Wort, the
New York Times and The Wall Street Journal (national edition), 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 or publication, any
unclaimed balance of such money then remaining shall be repaid to the Company.

Section 8.07. Reinstatement.

     If the Trustee or Paying Agent is unable to apply any legal tender in the
countries constituting the European Monetary Union or non-callable EEA
Government Obligations in accordance with Section 8.02 or 8.03 hereof, 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 shall be revived
and reinstated as though no deposit had occurred pursuant to Section 8.02 or
8.03 hereof until such time as the Trustee or Paying Agent is permitted to apply
all such money in accordance with Section 8.02 or 8.03 hereof, as the case may
be; provided, however, that, if the Company makes any payment of principal of,
premium, if any, or interest on any Note following the reinstatement of its
obligations, the Company shall be subrogated to the rights of the Holders of the
Notes to receive such payment from the money held by the Trustee or Paying
Agent.

                                    ARTICLE 9

                        AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01. Without Consent of Holders of Notes.

     Notwithstanding Section 9.02 of this Indenture, the Company and the Trustee
may amend or supplement this Indenture or the Notes without the consent of any
Holder of a Note:

          (a) to cure any ambiguity, defect or inconsistency;

          (b) to provide for uncertificated Notes in addition to or in place of
     certificated Notes;

          (c) to provide for the assumption of the Company's obligations to
     Holders of Notes in the case of a merger or consolidation or sale of all or
     substantially all of the Company's assets pursuant to Article 5 hereof;

          (d) to make any change that would provide any additional rights or
     benefits to the Holders of Notes or that does not adversely affect the
     legal rights under this Indenture of any such Holder; or

          (e) to comply with requirements of the SEC in order to effect or
     maintain the qualification of this Indenture under the TIA.

                                      -72-
<PAGE>

     Upon the request of the Company accompanied by a Board Resolution
authorizing the execution of any such amended or supplemental Indenture, and
upon receipt by the Trustee of the documents described in Section 7.02 hereof,
the Trustee shall join with the Company in the execution of any amended or
supplemental Indenture authorized or permitted by the terms of this Indenture
and to make any further appropriate agreements and stipulations that may be
therein contained, but the Trustee shall not be obligated to enter into such
amended or supplemental Indenture that affects its own rights, duties or
immunities under this Indenture or otherwise.

Section 9.02. With Consent of Holders of Notes.

     Except as provided below in this Section 9.02, the Company and the Trustee
may amend or supplement this Indenture (including Section 3.09, 4.10 and 4.14
hereof) and the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the Notes then outstanding
voting as a single class (including consents obtained in connection with a
tender offer or exchange offer for, or purchase of, the Notes), and, subject to
Sections 6.04 and 6.07 hereof, any existing Default or Event of Default (other
than a Default or Event of Default in the payment of the principal of, premium,
if any, or interest on the Notes, except a payment default resulting from an
acceleration that has been rescinded) or compliance with any provision of this
Indenture or the Notes may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes voting as a single
class (including consents obtained in connection with a tender offer or exchange
offer for, or purchase of, the Notes). Section 2.08 hereof shall determine which
Notes are considered to be "outstanding" for purposes of this Section 9.02.

     Upon the request of the Company accompanied by a Board Resolution
authorizing the execution of any such amended or supplemental Indenture, and
upon the filing with the Trustee of evidence satisfactory to the Trustee of the
consent of the Holders of Notes as aforesaid, and upon receipt by the Trustee of
the documents described in Section 7.02 hereof, the Trustee shall join with the
Company in the execution of such amended or supplemental Indenture unless such
amended or supplemental Indenture directly affects the Trustee's own rights,
duties or immunities under this Indenture or otherwise, in which case the
Trustee may in its discretion, but shall not be obligated to, enter into such
amended or supplemental Indenture.

     It shall not be necessary for the consent of the Holders of Notes under
this Section 9.02 to approve the particular form of any proposed amendment or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

     After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver. 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 amended or supplemental
Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount of the Notes then outstanding may waive
compliance in a particular instance by the Company with any provision of this
Indenture or the Notes. However, without the consent of each Holder affected, an
amendment or waiver under this Section 9.02 may not (with respect to any Notes
held by a non-consenting Holder):

          (a) reduce the principal amount of Notes whose Holders must consent to
     an amendment, supplement or waiver;

          (b) reduce the principal of or change the fixed maturity of any Note
     or alter or waive any of the provisions with respect to the redemption of
     such Note (except as provided above with respect to Sections 4.10 and 4.14
     hereof);

          (c) reduce the rate of or change the time for payment of interest on
     any Note;

                                      -73-
<PAGE>

          (d) waive a Default or Event of Default in the payment of principal of
     or premium, if any, or interest on the Notes (except a rescission of
     acceleration of such Notes by the Holders of at least a majority in
     aggregate principal amount of the then outstanding Notes and a waiver of
     the payment default that resulted from such acceleration);

          (e) make any Note payable in money other than that stated in the
     Notes;

          (f) make any change in the provisions of this Indenture relating to
     waivers of past Defaults or the rights of Holders of the Notes to receive
     payments of principal of or premium, if any, or interest on the Notes;

          (g) waive a redemption payment with respect to any Note (other than a
     payment required by one of the covenants described in Sections 4.10 and
     4.14)

          (h) cause the Notes to become subordinate in right of payment to any
     other Indebtedness or to otherwise reduce the ranking of the Notes;

          (i) make any change that would adversely affect the rights of the
     Holders to receive Additional Amounts;

          (j) modify the obligation of the Company to make a Change of Control
     Offer to purchase Notes after the occurrence of an event which constitutes
     a Change of Control; or

          (k) make any change in the preceding amendment and waiver provisions.

Section 9.03. Compliance with Trust Indenture Act.

     Every amendment or supplement to this Indenture or the Notes shall be set
forth in a amended or supplemental Indenture that complies with the TIA as then
in effect.

Section 9.04. Revocation and Effect of Consents.

     Until an amendment, supplement or waiver becomes effective, a consent to it
by a Holder of a Note is a continuing consent by the Holder of such Note and
every subsequent Holder of such Note or portion of such Note that evidences the
same debt as the consenting Holder's Note, even if notation of the consent is
not made on any Note. However, any such Holder of a Note or subsequent Holder of
a Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective. An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

Section 9.05. Notation on or Exchange of Notes.

     The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated. The Company in
exchange for all Notes may issue and the Trustee shall, upon receipt of an
Authentication Order, authenticate new Notes that reflect the amendment,
supplement or waiver.

     Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

                                      -74-
<PAGE>

Section 9.06. Trustee to Sign Amendments, etc.

     The Trustee shall sign any amended or supplemental Indenture authorized
pursuant to this Article Nine if the amendment or supplement does not adversely
affect the rights, duties, liabilities or immunities of the Trustee. The Company
may not sign an amendment or supplemental Indenture until the Board of Directors
approves it. In executing any amended or supplemental indenture, the Trustee
shall be entitled to receive and (subject to Section 7.01 hereof) shall be fully
protected in relying upon, in addition to the documents required by Section
10.04 hereof, an Officer's Certificate and an Opinion of Counsel stating that
the execution of such amended or supplemental indenture is authorized or
permitted by this Indenture.

                                   ARTICLE 9A

                             SATISFACTION AND WAIVER

Section 9.01A Satisfaction and Discharge of Indenture.

     This Indenture shall be discharged and shall cease to be of further effect
as to all Notes issued hereunder, when either (a) all Notes theretofore
authenticated and delivered (except lost, stolen or destroyed Notes which have
been replaced or paid and Notes for whose payment money has theretofore been
deposited in trust and thereafter repaid to the Company) have been delivered to
the Trustee for cancellation; or (b)(i) all Notes not theretofore delivered to
the Trustee for cancellation have become due and payable by reason of the making
of a notice of redemption or otherwise or will become due and payable within one
year and the Company has irrevocably deposited or caused to be deposited with
the Trustee as trust funds in trust an amount of money ( in legal tender in the
countries constituting the European Monetary Union) sufficient to pay and
discharge the entire Indebtedness on Notes not theretofore delivered to the
Trustee for cancellation for principal, premium, if any, and accrued interest to
the date of maturity or redemption; (ii) no Default or Event of Default with
respect to this Indenture or the Notes shall have occurred and be continuing on
the date of such deposit or shall occur as a result of such deposit and such
deposit shall not result in a breach or violation of, or constitute a default
under, any other instrument to which the Company is a party or by which the
Company or a Subsidiary Guarantor, if any, is bound: (iii) the Company has paid
or caused to be paid all sums payable by it under this Indenture; and (iv) the
Company has delivered irrevocable instructions to the Trustee under this
Indenture to apply the deposited money toward the payment of the Notes at
maturity or the redemption date, as the case may be.

     In addition, the Company shall deliver an Officer's Certificate and an
Opinion of Counsel to the Trustee stating that all conditions precedent to the
satisfaction and discharge of this Indenture have been satisfied.

Section 9.02A Application of Trust Money.

     All money deposited with the Trustee pursuant to Section 9.01A 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 Paying Agent) as the Trustee may determine, to
Persons entitled thereto, of the principal (and premium, if any) and interest
for whose payment such money has been deposited with the Trustee.

     If the Trustee or Paying Agent is unable to apply any money in accordance
with Section 9.01A by reason of any legal proceeding or by reason of any order
or judgement of any court or governmental authority enjoining, restraining or
otherwise prohibiting such application, the Company's obligations under this
Indenture and

                                      -75-
<PAGE>

the Notes shall be revived and reinstated as though such deposit had not
occurred pursuant to Section 9.01A; provided that if the Company has made any
payment of principal of, premium, if any, or interest on any Notes because of
the reinstatement of its obligations, the money shall be subrogated to the
rights of the Holders of such Notes to receive such payment from the Company or
money held by the Trustee or Paying Agent.

                                   ARTICLE 10

                                  MISCELLANEOUS

Section 10.01. Trust Indenture Act Controls.

     If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by TIA ss. 318(c), the imposed duties shall control.

Section 10.02. Notices.

     Any notice or communication by the Company or the Trustee to the others is
duly given if in writing and delivered in Person or mailed by first class mail
(registered or certified, return receipt requested), telex, telecopier or
overnight air courier guaranteeing next day delivery, to the others' address:

                  If to the Company:        360networks inc.
                                            1510-1066 West Hastings Street
                                            Vancouver, BC Canada V6E 3X1
                                            Telecopier No.:  (604) 681-6822
                                            Attention:  Secretary

                  With a copy to:           Cahill Gordon & Reindel
                                            80 Pine Street
                                            New York, New York 10005
                                            Telecopier No.:  (212)701-3000
                                            Attention:  Roger Andrus, Esq.

                  If to the Trustee:        HSBC Bank USA
                                            140 Broadway, 12th Floor
                                            New York, New York 10005-1180
                                            Telecopier No.:  (212) 658-6425
                                            Attention:  Issuer Services

     The Company or the Trustee, by notice to the others may designate
additional or different addresses for subsequent notices or communications.

     All notices and communications (other than those sent to Holders) 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 answered back, if telexed; when receipt acknowledged,
if telecopied; and the next Business Day after timely delivery to the courier,
if sent by overnight air courier guaranteeing next day delivery.

     Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar. Any notice or communication shall also be so mailed to any
Person described in

                                      -76-
<PAGE>

TIA ss. 313(c), to the extent required by the TIA. Failure to mail a notice or
communication to a Holder or any defect in it shall not affect its sufficiency
with respect to other Holders.

     If a notice or communication is mailed in the manner provided above within
the time prescribed, it is duly given, whether or not the addressee receives it.

     If the Company mails a notice or communication to Holders, it shall mail a
copy to the Trustee and each Agent at the same time.

Section 10.03. Communication by Holders of Notes with Other Holders of Notes.

     Holders may communicate pursuant to TIA ss. 312(b) with other Holders with
respect to their rights under this Indenture or the Notes. The Company, the
Trustee, the Registrar and anyone else shall have the protection of TIA ss.
312(c).

Section 10.04. Certificate and Opinion as to Conditions Precedent.

     Upon any request or application by the Company to the Trustee to take any
action under this Indenture, the Company shall furnish to the Trustee:

          (a) an Officers' Certificate in form and substance reasonably
     satisfactory to the Trustee (which shall include the statements set forth
     in Section 10.05 hereof) stating that, in the opinion of the signers, all
     conditions precedent and covenants, if any, provided for in this Indenture
     relating to the proposed action have been satisfied; and

          (b) an Opinion of Counsel in form and substance reasonably
     satisfactory to the Trustee (which shall include the statements set forth
     in Section 10.05 hereof) stating that, in the opinion of such counsel, all
     such conditions precedent and covenants have been satisfied.

Section 10.05. Statements Required in Certificate or Opinion.

     Each certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture (other than a certificate provided
pursuant to TIA ss. 314(a)(4)) shall comply with the provisions of TIA ss.
314(e) and shall include:

          (a) a statement that the Person making such certificate or opinion has
     read such covenant or condition;

          (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 such Person, he or she has
     made such examination or investigation as is necessary to enable him to
     express an informed opinion as to whether or not such covenant or condition
     has been satisfied; and

          (d) a statement as to whether or not, in the opinion of such Person,
     such condition or covenant has been satisfied.

                                      -77-
<PAGE>

Section 10.06. Rules by Trustee and Agents.

     The Trustee may make reasonable rules for action by or at a meeting of
Holders. The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

Section 10.07. No Personal Liability of Directors, Officers, Employees and
               Stockholders.

     No past, present or future director, officer, employee, incorporator or
stockholder of the Company or any of its Subsidiaries as such, shall have any
liability for any obligations of the Company or its Subsidiaries under the
Notes, this Indenture or for any claim based on, in respect of, or by reason of,
such obligations or their creation. Each Holder by accepting a Note waives and
releases all such liability. The waiver and release are part of the
consideration for issuance of the Notes.

Section 10.08. Governing Law.

     THE INTERNAL LAW OF THE STATE OF NEW YORK SHALL GOVERN AND BE USED TO
CONSTRUE THIS INDENTURE, THE NOTES WITHOUT GIVING EFFECT TO APPLICABLE
PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF
ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY.

Section 10.09. Jurisdiction.

     To the fullest extent permitted by applicable law, the Company irrevocably
submits to the jurisdiction of any federal or state court in the City, County
and State of New York, United States of America, in any suit or proceeding based
on or arising under this Indenture (solely in connection with any such suit or
proceeding), and irrevocably agrees that all claims in respect of such suit or
proceeding may be determined in any such court. The Company irrevocably and
fully waives the defense of an inconvenient forum to the maintenance of such
suit or proceeding. The Company hereby irrevocably designates and appoints CT
Corporation System (the "Process Agent"), as the authorized agent of the Company
upon whom process may be served in any such suit or proceeding, it being
understood that the designation and appointment of CT Corporation System as such
authorized agent shall become effective immediately without any further action
on the part of the Company. The Company represents that it has notified the
Process Agent of such designation and appointment and that the Process Agent has
accepted the same in writing. The Company hereby irrevocably authorizes and
directs the Process Agent to accept such service. The Company further agrees
that service of process upon the Process Agent and written notice of said
service to the Company mailed by prepaid registered first class mail or
delivered to the Process Agent at its principal office, shall be deemed in every
respect effective service of process upon the Company in any such suit or
proceeding. Nothing herein shall affect the right of any Holder or any Person
controlling such Holder to serve process in any other manner permitted by law.
The Company further agrees to take any and all action, including the execution
and filing of any and all such documents and instruments as may be necessary to
continue such designation and appointment of the Process Agent in full force and
effect so long as the Company has any outstanding obligations under this
Agreement. To the extent that the Company has or hereafter may acquire any
immunity from jurisdiction of any court or from any legal process (whether
through service of note, attachment prior to judgment, attachment in aid of
execution, executor or otherwise) with respect to itself or its property, the
Company hereby irrevocably waives such immunity in respect of their obligations
under this Indenture, to the extent permitted by law.

                                      -78-
<PAGE>

Section 10.10. No Adverse Interpretation of Other Agreements.

     This Indenture may not be used to interpret any other indenture, loan or
debt agreement of the Company or its Subsidiaries or of any other Person. Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

Section 10.11. Successors.

     All agreements of the Company in this Indenture and the Notes shall bind
its successors. All agreements of the Trustee in this Indenture shall bind its
successors.

Section 10.12. Severability.

     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 10.13. Counterpart Originals.

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

Section 10.14. Table of Contents, Headings, etc.

     The Table of Contents, Cross-Reference Table and Headings of the Articles
and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part of this Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

                         [Signatures on following page]

                                      -79-
<PAGE>

                                   SIGNATURES

Dated as of April 28, 2000

                                      360networks inc.

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

                                      HSBC BANK USA, AS TRUSTEE

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

                                      -80-
<PAGE>

                                                                      EXHIBIT A2

                                 [Face of Note]

                                                      CUSIP/NO. ________/_______

                            13% Senior Notes due 2008

No. ___                                             eurodollars_________________

                                360networks inc.

promises to pay to______________________________________________________________

or registered assigns,

the principal sum of____________________________________________________________

Euros (eurodollars_______________) on May 1, 2008.

Interest Payment Dates: May 1 and November 1

Record Dates: April 15 and October 15

Subject to Restrictions set forth in this Note.

                                      A-1
<PAGE>

Dated:
                                       360networks inc.

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

This is one of the Notes referred to
in the within-mentioned Indenture:

HSBC Bank USA,
as Trustee

By: __________________________________
              Authorized Signatory

                                      A-2
<PAGE>

                                 [Back of Note]
                            13% Senior Notes due 2008

["THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE."](1)

["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"), (B) IT HAS ACQUIRED
THIS NOTE IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH REGULATION S UNDER THE
SECURITIES ACT OR (C) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED
IN RULE 501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN
"IAI"), (2) AGREES THAT IT WILL NOT RESELL OR OTHERWISE TRANSFER THE 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) TO AN IAI THAT, PRIOR TO SUCH TRANSFER, FURNISHES THE
TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS
RELATING TO THE TRANSFER OF THIS NOTE (THE FORM OF WHICH CAN BE OBTAINED FROM
THE TRUSTEE) AND , IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL
AMOUNT OF NOTES LESS THAN U.S. $250,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE
COMPANY THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (F) 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 (G) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT AND, IN EACH CASE, IN
ACCORDANCE WITH OTHER 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."](2)

----------

1        This paragraph should be included only if the Note is issued in global
         form.

2        This paragraph should be removed upon the exchange of Notes for
         Exchange Notes in the Exchange Offer or upon the registration of the
         Notes pursuant to the terms of the Registration Rights Agreement.

                                       A-3
<PAGE>

     Capitalized terms used herein shall have the meanings assigned to them in
the Indenture referred to below unless otherwise indicated.

     1. INTEREST. 360networks inc., a company continued under the laws of Nova
Scotia, Canada (the "Company"), promises to pay interest on the principal amount
of this Note at the rate of 13% per annum from April 28, 2000 until maturity.
The interest rate on the Notes is subject to increase pursuant to the provisions
of the Registration Rights Agreement. The Company will pay interest
semi-annually in arrears on May 1 and November 1 of each year (each an "Interest
Payment Date"), or if any such day is not a Business Day, on the next succeeding
Business Day. Interest on the Notes will accrue from the most recent date to
which interest has been paid or, if no interest has been paid, from the date of
issuance; provided that if there is no existing Default in the payment of
interest, and if this Note is authenticated between a record date referred to on
the face hereof and the next succeeding Interest Payment Date, interest shall
accrue from such next succeeding Interest Payment Date; provided, further, that
the first Interest Payment Date shall be November 1, 2000. The Company shall pay
interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue principal and premium, if any, from time to time on
demand at a rate that is 1% per annum in excess of the rate then in effect; it
shall pay interest (including post-petition interest in any proceeding under any
Bankruptcy Law) on overdue installments of interest (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest will be computed on the basis of a 360-day year of
twelve 30-day months.

     2. METHOD OF PAYMENT. The Company will pay interest on the Notes (except
defaulted interest) to the Persons who are registered Holders of Notes at the
close of business on the April 15 or October 15 next preceding the Interest
Payment Date, even if such Notes are canceled after such record date and on or
before such Interest Payment Date, except as provided in Section 2.12 of the
Indenture with respect to defaulted interest. The Notes will be payable as to
principal, premium, if any, and interest at the office of the Paying Agent in
New York City or, subject to any applicable laws and regulations, at the office
of the Paying Agent in Luxembourg. Payment by wire transfer of immediately
available funds will be required with respect to principal of and interest,
premium on, all Notes. Such payment shall be in such coin or currency of the
countries constituting the European Monetary Union as at the time of payment is
legal tender for payment of public and private debts.

     3. PAYING AGENT AND REGISTRAR. Initially, HSBC Bank USA, the Trustee under
the Indenture, will act as principal Paying Agent and Registrar and Banque
General du Luxembourg will initially act as an additional Paying Agent in
Luxembourg. The Company may change any Paying Agent or Registrar without notice
to any Holder. The Company or any of its Subsidiaries may act in any such
capacity.

     4. INDENTURE. The Company issued the Notes under an Indenture dated as of
April 28, 2000 ("Indenture") between the Company and the Trustee. The terms of
the Notes include those stated in the Indenture and those made part of the
Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S.
Code ss.ss. 77aaa-77bbbb). The Notes are subject to all such terms, and Holders
are referred to the Indenture and such Act for a statement of such terms. To the
extent any provision of this Note conflicts with the express provisions of the
Indenture, the provisions of the Indenture shall govern and be controlling. The
Notes are obligations of the Company limited to eurodollars200 million in
aggregate principal amount.

     5. OPTIONAL REDEMPTION. The Company may redeem the Notes in the event the
Company becomes obligated to pay any Additional Amounts as a result of a change
in the laws or regulations of Canada or any Canadian Taxing Authority, or a
change in any official position regarding the application or interpretation
thereof, which is publicly announced or becomes effective on or after the Issue
Date. Upon the occurrence of any such change, the Company may, at any time,
redeem all, but not part, of the Notes at a price equal to 100% of the principal
amount thereof, plus accrued and unpaid interest, if any, to the redemption
date. The Company will give written notice of any such redemption not less than
30 nor more than 60 days prior to the redemption date.

     6. PAYMENT OF ADDITIONAL AMOUNTS. All payments made by or on behalf of the
Company on or with respect to the Notes shall be made without withholding or
deduction for any Taxes imposed by any Canadian Taxing Authority, unless
required by law or the interpretation or administration thereof by the relevant

                                       A-4
<PAGE>

Taxing Authority. If the Company or any other payor is required to withhold or
deduct any amount on account of Taxes from any payment made on or with respect
to the Notes, the Company shall:

          (a) make such withholding or deduction;

          (b) remit the full amount deducted or withheld to the relevant
     government authority in accordance with applicable law;

          (c) pay such additional amounts ("Additional Amounts") as may be
     necessary so that the net amount received by each Holder (including
     Additional Amounts) after such withholding or deduction shall not be less
     than the amount the Holder would have received if such Taxes had not been
     withheld or deducted;

          (d) furnish to the Holders, within 30 days after the date the payment
     of any Taxes is due, certified copies of tax receipts evidencing such
     payment by the Company;

          (e) indemnify and hold harmless each Holder (other than an Excluded
     Holder) for the amount of (i) any Taxes paid by such Holder as a result of
     payments made on or with respect to the Notes, (ii) any liability
     (including penalties, interest and expenses) arising therefrom or with
     respect thereto and (iii) any Taxes imposed with respect to any
     reimbursement under (i) or (ii), but excluding any such Taxes on such
     Holder's net income; and

          (f) at least 30 days prior to each date on which any Additional
     Amounts are payable, deliver to the Trustee an Officers' Certificate
     stating the amounts so payable and such other information necessary to
     enable the Trustee to pay such Additional Amounts to Holders on the payment
     date.

     Notwithstanding the foregoing, no Additional Amounts shall be payable to a
Holder in respect of a beneficial owner of a Note (an "Excluded Holder"):

          (a) with which the Company does not deal at arm's length (within the
     meaning of the Income Tax Act (Canada)) at the time of making such payment;
     or

          (b) which is subject to such Taxes by reason of its being connected
     with Canada or any province or territory thereof otherwise than by the mere
     acquisition, holding or disposition of Notes or the receipt of payments
     thereunder.

     7. MANDATORY REDEMPTION. Except as otherwise provided in Paragraph 8 below,
the Company shall not be required to make mandatory redemption payments with
respect to the Notes. In addition, the Company is not required to make any
sinking fund payments with respect to the Notes.

     8. REPURCHASE AT OPTION OF HOLDER.

     (a) Upon the occurrence of a Change of Control, each Holder of Notes shall
have the right to require the Company to repurchase all or any part (equal to
eurodollars1,000 or an integral multiple thereof) of that Holder's Notes
pursuant to the Change of Control Offer. In the Change of Control Offer, the
Company will offer (the "Change of Control Offer") a Change of Control Payment
in cash equal to 101% of the aggregate principal amount of Notes repurchased
plus accrued and unpaid interest, if any, thereon to the date of purchase.
Within 20 days following any Change of Control, the Company will mail a notice
to each Holder (with a copy to the Trustee) describing the transaction or
transactions that constitute the Change of Control and offering to repurchase
Notes on the Change of Control Payment Date specified in such notice, pursuant
to the procedures required by the Indenture and described in such notice. The
Company will comply with the requirements of Rule 14e-1 under the Exchange Act
and any other securities laws and regulations thereunder to the extent such laws
and regulations are applicable in connection with the repurchase of the Notes as
a result of a Change of Control.

                                       A-5
<PAGE>

     (b) If the Company or a Subsidiary consummates any Asset Sale, within five
days of each date on which the aggregate amount of Excess Proceeds exceeds U.S.
$10 million, the Company shall commence an offer to all Holders of Notes (an
"Asset Sale Offer") pursuant to Section 3.09 of the Indenture to purchase the
maximum principal amount of Notes and pari passu Indebtedness, including the
Dollar Notes, that may be purchased out of the Excess Proceeds at an offer price
in cash in an amount equal to 100% of the principal amount thereof plus accrued
and unpaid interest thereon, if any, to the date fixed for the closing of such
offer, in accordance with the procedures set forth in the Indenture. To the
extent that the aggregate amount of Notes and such pari passu Indebtedness
tendered pursuant to an Asset Sale Offer is less than the Excess Proceeds, the
Company (or such Subsidiary) may use such deficiency for any purpose not
otherwise prohibited by the Indenture. If the aggregate principal amount of
Notes and such pari passu Indebtedness surrendered by Holders thereof exceeds
the amount of Excess Proceeds, the Trustee shall select the Notes and such pari
passu Indebtedness to be purchased on a pro rata basis. Holders of Notes that
are the subject of an offer to purchase will receive an Asset Sale Offer from
the Company prior to any related purchase date and may elect to have such Notes
purchased by completing the form entitled "Option of Holder to Elect Purchase"
on the reverse of the Notes.

     9. NOTICE OF REDEMPTION. Notice of redemption will be mailed by first class
mail at least 30 days but not more than 60 days before the redemption date to
each Holder whose Notes are to be redeemed at its registered address. Notes in
denominations larger than eurodollars1,000 may be redeemed in part but only in
whole multiples of eurodollars1,000, unless all of the Notes held by a Holder
are to be redeemed. On and after the redemption date interest ceases to accrue
on Notes or portions thereof called for redemption.

     10. DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in denominations of eurodollars1,000 and integral multiples of
eurodollars1,000. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed in
part. Also, the Company need not exchange or register the transfer of any Notes
for a period of 15 days before a selection of Notes to be redeemed or during the
period between a record date and the corresponding Interest Payment Date.

     11. PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated
as its owner for all purposes, other than with respect to the payment of
Additional Amounts.

     12. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the
Indenture or the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the then outstanding
Notes, and any existing default or compliance with any provision of the
Indenture or the Notes may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes. Without the consent
of any Holder of a Note, the Indenture or the Notes may be amended or
supplemented to cure any ambiguity, defect or inconsistency, to provide for
uncertificated Notes in addition to or in place of certificated Notes, to
provide for the assumption of the Company's obligations to Holders of the Notes
in case of a merger or consolidation or sale of all or substantially all of the
Company's assets, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, to comply with the requirements
of the SEC in order to effect or maintain the qualification of the Indenture
under the TIA.

     13. DEFAULTS AND REMEDIES. Events of Default include: (i) default for 30
days in the payment when due of interest on, or Additional Amounts, if any, with
respect to the Notes, (ii) default in payment when due of principal of or
premium, if any, on the Notes, (iii) failure by the Company or any of its
Restricted Subsidiaries to comply with Section 5.01, 4.07, 4.09, or 4.11 of the
Indenture, (iv) failure by the Company or any of its Restricted Subsidiaries for
15 days after notice to the Company by the Trustee or to the Company and the
Trustee by the Holders of at least 25% in principal amount of the Notes then
outstanding to comply with Section 4.10 or 4.14 of the Indenture or the Notes,
(v) failure by the Company or any of its Restricted Subsidiaries for 60 days
after notice to the Company by the Trustee or to the Company and the Trustee by
the Holders of at least 25% in

                                       A-6
<PAGE>

principal amount of the Notes then outstanding to comply with any of the other
agreements in the Indenture or the Notes, (vi) voluntary relinquishment by the
Company of any of its rights under the Non-Competition Agreement or failure by
the Company for 30 days after written notice thereof has been given to the
Company by the Trustee or to the Company and the Trustee by Holders of at least
25% of the aggregate principal amount of the Notes outstanding to enforce any of
such rights, in each case which is materially detrimental to the interests of
the Company or the Holders, (vii) default under certain other agreements
relating to Indebtedness of the Company which default results in the
acceleration of such Indebtedness prior to its express maturity; (viii) certain
final judgments for the payment of money that remain undischarged for a period
of 60 days; (ix) certain events of bankruptcy or insolvency with respect to the
Company or any of its Material Subsidiaries. If any Event of Default occurs and
is continuing, the Trustee or the Holders of at least 25% in principal amount of
the then outstanding Notes may declare all the Notes to be due and payable.
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency, all outstanding Notes will become
due and payable without further action or notice. Holders may not enforce the
Indenture or the Notes except as provided in the Indenture. Subject to certain
limitations, Holders of a majority in principal amount of the then outstanding
Notes may direct the Trustee in its exercise of any trust or power. The Trustee
may withhold from Holders of the Notes notice of any continuing Default or Event
of Default (except a Default or Event of Default relating to the payment of
principal or interest) if it determines that withholding notice is in their
interest. The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may on behalf of the Holders of all of
the Notes waive any existing Default or Event of Default and its consequences
under the Indenture except a continuing Default or Event of Default in the
payment of interest on, or the principal of, the Notes. The Company is required
to deliver to the Trustee annually a statement regarding compliance with the
Indenture, and the Company is required upon becoming aware of any Default or
Event of Default, to deliver to the Trustee a statement specifying such Default
or Event of Default.

     14. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or any
other capacity, may make loans to, accept deposits from, and perform services
for the Company or its Affiliates, and may otherwise deal with the Company or
its Affiliates, as if it were not the Trustee.

     15. NO RECOURSE AGAINST OTHERS. A director, officer, employee, incorporator
or stockholder, of the Company, as such, shall not have any liability for any
obligations of the Company under the Notes or the Indenture or for any claim
based on, in respect of, or by reason of, such obligations or their creation.
Each Holder by accepting a Note waives and releases all such liability. The
waiver and release are part of the consideration for the issuance of the Notes.

     16. GOVERNING LAW. This Note and the Indenture shall be governed by and
construed in accordance with the laws of the State of New York, as applied to
contracts made and performed within the State of New York, without regard to
principles of conflict of laws. Each of the parties hereto and the holders agree
to submit to the jurisdiction of the courts of the State of New York in any
action or proceeding arising out of or relating to this Note.

     17. AUTHENTICATION. This Note shall not be valid until authenticated by the
manual signature of the Trustee or an authenticating agent.

     18. ABBREVIATIONS. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

     19. ADDITIONAL RIGHTS OF HOLDERS OF RESTRICTED GLOBAL NOTES AND RESTRICTED
DEFINITIVE NOTES. In addition to the rights provided to Holders of Notes under
the Indenture, Holders of Restricted Global Notes and Restricted Definitive
Notes shall have all the rights set forth in the A/B Exchange Registration
Rights Agreement dated as of April 28, 2000, among the Company and Donaldson,
Lufkin & Jenrette Securities Corporation, Goldman Sachs & Co., Bear, Stearns &
Co. Inc., Chase Securities Inc., Credit Suisse First Boston Corpo-

                                       A-7
<PAGE>

ration, Morgan Stanley & Co. Incorporated, Salomon Smith Barney Inc., RBC
Dominion Securities Corporation and TD Securities (USA) Inc. (the "Registration
Rights Agreement").

     20. CUSIP NUMBERS. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders. No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

     The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

                           360networks inc.
                           1510-1066 West Hastings Street
                           Vancouver, BC Canada V6E 3X1
                           Attention:  Secretary
                           Telecopier No.:  (604) 681-6822

                                      A-8
<PAGE>

                                 ASSIGNMENT FORM

     To assign this Note, fill in the form below:

(I) or (we) assign and transfer this Note to:___________________________________
                                                (Insert assignee's legal name)

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. no.)
________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

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

and irrevocably appoint_________________________________________________________
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

Date: _______________________

                                  Your Signature:_______________________________
                                                 (Sign exactly as your name
                                                 appears on the face of this
                                                 Note)

Signature Guarantee*: _________________________

* Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                      A-9
<PAGE>

                       OPTION OF HOLDER TO ELECT PURCHASE

     If you want to elect to have this Note purchased by the Company pursuant to
Section 4.10 or 4.14 of the Indenture, check the appropriate box below:

                            Section 4.10             Section 4.14

If you want to elect to have only part of the Note purchased by the Company
pursuant to Section 4.10 or Section 4.14 of the Indenture, state the amount you
elect to have purchased:

                        eurodollars_____________________

Date: _______________________

                                 Your Signature:________________________________
                                                (Sign exactly as your name
                                                appears on the face of this
                                                Note)

                                 Tax Identification No.:________________________

Signature Guarantee*: _________________________

* Participant in a recognized Signature Guarantee Medallion Program (or other
signature guarantor acceptable to the Trustee).

                                      A-10
<PAGE>

             SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE*

     The following exchanges of a part of this Global Note for an interest in
another Global Note or for a Definitive Note, or exchanges of a part of another
Global Note or Definitive Note for an interest in this Global Note, have been
made:

<TABLE>
<CAPTION>
<S>                 <C>                      <C>                      <C>                       <C>
                                                                        Principal Amount of          Signature of
                      Amount of decrease in   Amount of increase in       this Global Note       authorized officer of
                       Principal Amount of    Principal Amount of     following such decrease       Trustee or Note
Date of Exchange       this Global Note        this Global Note            (or increase)              Custodian
----------------      ---------------------   ---------------------   -----------------------    ---------------------

</TABLE>

                                      A-11
<PAGE>

                                                                       EXHIBIT B

                         FORM OF CERTIFICATE OF TRANSFER

360networks inc.
1510-1066 West Hastings Street
Vancouver, BC Canada V6E 3X1

HSBC Bank USA
140 Broadway, 12th Floor
New York, New York 10005-1180

                          Re: 13% Senior Notes due 2008

     Reference is hereby made to the Indenture, dated as of April 28, 2000 (the
"Indenture"), between 360networks inc., as issuer (the "Company"), and HSBC Bank
USA, as trustee. Capitalized terms used but not defined herein shall have the
meanings given to them in the Indenture.

     ___________________, (the "Transferor") owns and proposes to transfer the
Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of eurodollars___________ in such Note[s] or interests (the
"Transfer"), to ___________________________ (the "Transferee"), as further
specified in Annex A hereto. In connection with the Transfer, the Transferor
hereby certifies that:

                             [CHECK ALL THAT APPLY]

     1. |_| Check if Transferee will take delivery of a beneficial interest in
the 144A Global Note or a Definitive Note Pursuant to Rule 144A. The Transfer is
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the beneficial
interest or Definitive Note is being transferred to a Person that the Transferor
reasonably believed and believes is purchasing the beneficial interest or
Definitive Note for its own account, or for one or more accounts with respect to
which such Person exercises sole investment discretion, and such Person and each
such account is a "qualified institutional buyer" within the meaning of Rule
144A in a transaction meeting the requirements of Rule 144A and such Transfer is
in compliance with any applicable blue sky securities laws of any state of the
United States. Upon consummation of the proposed Transfer in accordance with the
terms of the Indenture, the transferred beneficial interest or Definitive Note
will be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the 144A Global Note and/or the Definitive Note and
in the Indenture and the Securities Act.

     2. |_| Check if Transferee will take delivery of a beneficial interest in
the Regulation S Global Note or a Definitive Note pursuant to Regulation S. The
Transfer is being effected pursuant to and in accordance with Rule 903 or Rule
904 under the Securities Act and, accordingly, the Transferor hereby further
certifies that (i) the Transfer is not being made to a person in the United
States and (x) at the time the buy order was originated, the Transferee was
outside the United States or such Transferor and any Person acting on its behalf
reasonably believed and believes that the Transferee was outside the United
States or (y) the transaction was executed in, on or through the facilities of a
designated offshore securities market and neither such Transferor nor any Person
acting on its behalf knows that the transaction was prearranged with a buyer in
the United States, (ii) no directed selling efforts have been made in
contravention of the requirements of Rule 903(b) or Rule 904(b) of Regulation S
under the Securities Act and (iii) the transaction is not part of a plan or
scheme to evade the regist-

                                      B-1
<PAGE>

ration requirements of the Securities Act. Upon consummation of the proposed
transfer in accordance with the terms of the Indenture, the transferred
beneficial interest or Definitive Note will be subject to the restrictions on
Transfer enumerated in the Private Placement Legend printed on the Regulation S
Global Note and/or the Definitive Note and in the Indenture and the Securities
Act.

     3. |_| Check and complete if Transferee will take delivery of a beneficial
interest in a Definitive Note pursuant to any provision of the Securities Act
other than Rule 144A or Regulation S. The Transfer is being effected in
compliance with the transfer restrictions applicable to beneficial interests in
Restricted Global Notes and Restricted Definitive Notes and pursuant to and in
accordance with the Securities Act and any applicable blue sky securities laws
of any state of the United States, and accordingly the Transferor hereby further
certifies that (check one):

          (a) |_| such Transfer is being effected pursuant to and in accordance
     with Rule 144 under the Securities Act;

                                       or

          (b) |_| such Transfer is being effected to the Company or a subsidiary
     thereof;

                                       or

          (c) |_| such Transfer is being effected pursuant to an effective
     registration statement under the Securities Act and in compliance with the
     prospectus delivery requirements of the Securities Act;

                                       or

          (d) |_| such Transfer is being effected to an Institutional Accredited
     Investor and pursuant to an exemption from the registration requirements of
     the Securities Act other than Rule 144A, Rule 144 or Rule 904, and the
     Transferor hereby further certifies that it has not engaged in any general
     solicitation within the meaning of Regulation D under the Securities Act
     and the Transfer complies with the transfer restrictions applicable to
     beneficial interests in a Restricted Global Note or Restricted Definitive
     Notes and the requirements of the exemption claimed, which certification is
     supported by (1) a certificate executed by the Transferee in the form of
     Exhibit D to the Indenture and (2) an Opinion of Counsel provided by the
     Transferor or the Transferee (a copy of which the Transferor has attached
     to this certification), to the effect that such Transfer is in compliance
     with the Securities Act. Upon consummation of the proposed transfer in
     accordance with the terms of the Indenture, the transferred beneficial
     interest or Definitive Note will be subject to the restrictions on transfer
     enumerated in the Private Placement Legend printed on the Restricted Global
     Note and/or the Definitive Notes and in the Indenture and the Securities
     Act.

     4. |_| Check if Transferee will take delivery of a beneficial interest in
an Unrestricted Global Note or of an Unrestricted Definitive Note.

     (a) |_| Check if Transfer is pursuant to Rule 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act. Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred beneficial interest or Definitive
Note will no longer be subject to the restrictions on transfer enumerated in the
Private Placement Legend printed on the Restricted Global Notes, on Restricted
Definitive Notes and in the Indenture.

     (b) |_| Check if Transfer is Pursuant to Regulation S. (i) The Transfer is
being effected pursuant to and in accordance with Rule 903 or Rule 904 under the
Securities Act and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any state of the United
States and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note will no longer be subject to

                                      B-2
<PAGE>

the restrictions on transfer enumerated in the Private Placement Legend printed
on the Restricted Global Notes, on Restricted Definitive Notes and in the
Indenture.

     (c) |_| Check if Transfer is Pursuant to Other Exemption. (i) The Transfer
is being effected pursuant to and in compliance with an exemption from the
registration requirements of the Securities Act other than Rule 144, Rule 903 or
Rule 904 and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any State of the United
States and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred beneficial interest or
Definitive Note will not be subject to the restrictions on transfer enumerated
in the Private Placement Legend printed on the Restricted Global Notes or
Restricted Definitive Notes and in the Indenture.

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

                                     ___________________________________________
                                          [Insert Name of Transferor]

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

Dated: _____________________

                                      B-3
<PAGE>

                       ANNEX A TO CERTIFICATE OF TRANSFER

     1. The Transferor owns and proposes to transfer the following:

                            [CHECK ONE OF (a) OR (b)]

          (a)  |_| a beneficial interest in the:

               (i)  |_| 144A Global Note (ISIN XS0110870606), or

               (ii) |_| Regulation S Global Note (ISIN XS0110871083), or

          (b)  |_| a Restricted Definitive Note.

     2. After the Transfer the Transferee will hold:

                                   [CHECK ONE]

          (a)  |_| a beneficial interest in the:

               (i)  |_| 144A Global Note (ISIN XS0110870606), or

               (ii) |_| Regulation S Global Note (ISIN XS0110871083), or

               (iii) |_| Unrestricted Global Note (ISIN __________); or

          (b)  |_| a Restricted Definitive Note; or

          (c)  |_| an Unrestricted Definitive Note,

     in accordance with the terms of the Indenture.

                                      B-4
<PAGE>

                                                                       EXHIBIT C

                         FORM OF CERTIFICATE OF EXCHANGE

360networks inc
1510-1066 West Hastings Street
Vancouver, BC Canada V6E 3X1

HSBC Bank USA
140 Broadway, 12th Floor
New York, New York 10005-1180

                          Re: 13% Senior Notes due 2008

                               (ISIN ____________)

     Reference is hereby made to the Indenture, dated as of April 28, 2000 (the
"Indenture"), between 360networks inc., as issuer (the "Company"), and HSBC Bank
USA, as trustee. Capitalized terms used but not defined herein shall have the
meanings given to them in the Indenture.

     __________________________, (the "Owner") owns and proposes to exchange the
Note[s] or interest in such Note[s] specified herein, in the principal amount of
eurodollars____________ in such Note[s] or interests (the "Exchange"). In
connection with the Exchange, the Owner hereby certifies that:

     1. Exchange of Restricted Definitive Notes or Beneficial Interests in a
Restricted Global Note for Unrestricted Definitive Notes or Beneficial Interests
in an Unrestricted Global Note

     (a) |_| Check if Exchange is from beneficial interest in a Restricted
Global Note to beneficial interest in an Unrestricted Global Note. In connection
with the Exchange of the Owner's beneficial interest in a Restricted Global Note
for a beneficial interest in an Unrestricted Global Note in an equal principal
amount representing the same underlying indebtedness, the Owner hereby certifies
(i) the beneficial interest is being acquired for the Owner's own account
without transfer, (ii) such Exchange has been effected in compliance with the
transfer restrictions applicable to the Global Notes and pursuant to and in
accordance with the United States Securities Act of 1933, as amended (the
"Securities Act"), (iii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the beneficial interest in an
Unrestricted Global Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

     (b) |_| Check if Exchange is from beneficial interest in a Restricted
Global Note to Unrestricted Definitive Note. In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for an Unrestricted
Definitive Note, the Owner hereby certifies (i) the Definitive Note is being
acquired for the Owner's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to the
Restricted Global Notes and pursuant to and in accordance with the Securities
Act, (iii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act and (iv) the Definitive Note is being acquired in compliance
with any applicable blue sky securities laws of any state of the United States.

     (c) |_| Check if Exchange is from Restricted Definitive Note to beneficial
interest in an Unrestricted Global Note. In connection with the Owner's Exchange
of a Restricted Definitive Note for a bene-

<PAGE>

ficial interest in an Unrestricted Global Note, the Owner hereby certifies (i)
the beneficial interest is being acquired for the Owner's own account without
transfer, (ii) such Exchange has been effected in compliance with the transfer
restrictions applicable to Restricted Definitive Notes and pursuant to and in
accordance with the Securities Act, (iii) the restrictions on transfer contained
in the Indenture and the Private Placement Legend are not required in order to
maintain compliance with the Securities Act and (iv) the beneficial interest is
being acquired in compliance with any applicable blue sky securities laws of any
state of the United States.

     (d) |_| Check if Exchange is from Restricted Definitive Note to
Unrestricted Definitive Note. In connection with the Owner's Exchange of a
Restricted Definitive Note for an Unrestricted Definitive Note, the Owner hereby
certifies (i) the Unrestricted Definitive Note is being acquired for the Owner's
own account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Definitive Note is being acquired in compliance with any applicable
blue sky securities laws of any state of the United States.

     2. Exchange of Restricted Definitive Notes or Beneficial Interests in
Restricted Global Notes for Restricted Definitive Notes or Beneficial Interests
in Restricted Global Notes

     (a) |_| Check if Exchange is from beneficial interest in a Restricted
Global Note to Restricted Definitive Note. In connection with the Exchange of
the Owner's beneficial interest in a Restricted Global Note for a Restricted
Definitive Note with an equal principal amount, the Owner hereby certifies that
the Restricted Definitive Note is being acquired for the Owner's own account
without transfer. Upon consummation of the proposed Exchange in accordance with
the terms of the Indenture, the Restricted Definitive Note issued will continue
to be subject to the restrictions on transfer enumerated in the Private
Placement Legend printed on the Restricted Definitive Note and in the Indenture
and the Securities Act.

     (b) |_| Check if Exchange is from Restricted Definitive Note to beneficial
interest in a Restricted Global Note. In connection with the Exchange of the
Owner's Restricted Definitive Note for a beneficial interest in the [CHECK ONE]
144A Global Note or Regulation S Global Note with an equal principal amount, the
Owner hereby certifies (i) the beneficial interest is being acquired for the
Owner's own account without transfer and (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Restricted Global
Notes and pursuant to and in accordance with the Securities Act, and in
compliance with any applicable blue sky securities laws of any state of the
United States. Upon consummation of the proposed Exchange in accordance with the
terms of the Indenture, the beneficial interest issued will be subject to the
restrictions on transfer enumerated in the Private Placement Legend printed on
the relevant Restricted Global Note and in the Indenture and the Securities Act.

                                      C-2
<PAGE>

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

                                   ________________________________________
                                        [Insert Name of Transferor]

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

Dated: _________________

                                      C-3
<PAGE>

                                                                       EXHIBIT E

                            FORM OF CERTIFICATE FROM
                   ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR

360networks inc.
1510-1066 West Hastings Street
Vancouver, BC Canada V6E 3X1

HSBC Bank USA
140 Broadway, 12th Floor
New York, New York 10005-1180

                          Re: 13% Senior Notes due 2008

     Reference is hereby made to the Indenture, dated as of April 28, 2000 (the
"Indenture"), between 360networks inc., as issuer (the "Company"), and HSBC Bank
USA, as trustee. Capitalized terms used but not defined herein shall have the
meanings given to them in the Indenture.

     In connection with our proposed purchase of eurodollars____________
aggregate principal amount of:

     (a) |_| a beneficial interest in a Global Note, or

     (b) |_| a Definitive Note,

     we confirm that:

     1. We understand that any subsequent transfer of the Notes or any interest
therein is subject to certain restrictions and conditions set forth in the
Indenture and the undersigned agrees to be bound by, and not to resell, pledge
or otherwise transfer the Notes or any interest therein except in compliance
with, such restrictions and conditions and the United States Securities Act of
1933, as amended (the "Securities Act").

     2. We understand that the offer and sale of the Notes have not been
registered under the Securities Act, and that the Notes and any interest therein
may not be offered or sold except as permitted in the following sentence. We
agree, on our own behalf and on behalf of any accounts for which we are acting
as hereinafter stated, that if we should sell the Notes or any interest therein,
we will do so only (A) to the Company or any subsidiary thereof, (B) in
accordance with Rule 144A under the Securities Act to a "qualified institutional
buyer" (as defined therein), (C) to an institutional "accredited investor" (as
defined below) that, prior to such transfer, furnishes (or has furnished on its
behalf by a U.S. broker-dealer) to you and to the Company a signed letter
substantially in the form of this letter and an Opinion of Counsel in form
reasonably acceptable to the Company to the effect that such transfer is in
compliance with the Securities Act, (D) outside the United States in accordance
with Rule 904 of Regulation S under the Securities Act, (E) pursuant to the
provisions of Rule 144(k) under the Securities Act or (F) pursuant to an
effective registration statement under the Securities Act, and we further agree
to provide to any person purchasing the Definitive Note or beneficial interest
in a Global Note from us in a transaction meeting the requirements of clauses
(A) through (E) of this paragraph a notice advising such purchaser that resales
thereof are restricted as stated herein.

                                      E-1
<PAGE>

     3. We understand that, on any proposed resale of the Notes or beneficial
interest therein, we will be required to furnish to you and the Company such
certifications, legal opinions and other information as you and the Company may
reasonably require to confirm that the proposed sale complies with the foregoing
restrictions. We further understand that the Notes purchased by us will bear a
legend to the foregoing effect.

     4. We are an institutional "accredited investor" (as defined in Rule
501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and have
such knowledge and experience in financial and business matters as to be capable
of evaluating the merits and risks of our investment in the Notes, and we and
any accounts for which we are acting are each able to bear the economic risk of
our or its investment.

     5. We are acquiring the Notes or beneficial interest therein purchased by
us for our own account or for one or more accounts (each of which is an
institutional "accredited investor") as to each of which we exercise sole
investment discretion.

     You and the Company are entitled to rely upon this letter and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any administrative or legal proceedings or official inquiry with
respect to the matters covered hereby.

                                   ____________________________________________
                                      [Insert Name of Accredited Investor]

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

Dated: ___________________

                                      E-2

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