Document:

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                                                                    EXHIBIT 10.4

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                    AMENDED AND RESTATED FIBER SALE AGREEMENT

                                     BETWEEN

                           PF.NET CORP. ("PURCHASER")

                                       AND

                               AT&T CORP. ("AT&T")

                        ENTERED INTO AS OF JULY 27, 2001

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                                TABLE OF CONTENTS

                                                                           PAGE

ARTICLE I CERTAIN DEFINITIONS................................................1

ARTICLE II SALE OF FIBER IN THE AT&T SYSTEM..................................6

ARTICLE III CONSIDERATION FOR SALE AND PAYMENT TERMS.........................8

ARTICLE IV CONSTRUCTION OF THE AT&T SYSTEM..................................10

ARTICLE V ACCEPTANCE AND TESTING OF PURCHASER STRANDS.......................11

ARTICLE VI DOCUMENTATION....................................................12

ARTICLE VII NETWORK ACCESS AND MAINTENANCE; REGENERATION FACILITIES.........12

ARTICLE VIII OPERATIONS.....................................................13

ARTICLE IX PERMITS; UNDERLYING RIGHTS; RELOCATION...........................13

ARTICLE X USE OF AT&T SYSTEM................................................16

ARTICLE XI INDEMNIFICATION..................................................16

ARTICLE XII LIMITATION OF LIABILITY.........................................18

ARTICLE XIII INSURANCE......................................................18

ARTICLE XIV TAXES AND FRANCHISE, LICENSE AND PERMIT FEES....................20

ARTICLE XV NOTICE...........................................................21

ARTICLE XVI DEFAULTS........................................................23

ARTICLE XVII TERMINATION....................................................25

ARTICLE XVIII FORCE MAJEURE.................................................25

ARTICLE XIX DISPUTE RESOLUTION..............................................26

ARTICLE XX WAIVER...........................................................27

ARTICLE XXI GOVERNING LAW, APPLICABLE LAW...................................27

ARTICLE XXII RULES OF CONSTRUCTION..........................................28

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ARTICLE XXIII ASSIGNMENT AND DARK FIBER TRANSFERS...........................28

ARTICLE XXIV REPRESENTATIONS, WARRANTIES AND ACKNOWLEDGMENTS................30

ARTICLE XXV ENTIRE AGREEMENT; AMENDMENT.....................................32

ARTICLE XXVI BRANDING ISSUES; CONFIDENTIALITY...............................32

ARTICLE XXVII NO PERSONAL LIABILITY.........................................34

ARTICLE XXVIII RELATIONSHIP OF THE PARTIES..................................35

ARTICLE XXIX LATE PAYMENTS..................................................35

ARTICLE XXX SEVERABILITY....................................................35

ARTICLE XXXI COUNTERPARTS...................................................35

Exhibit A:     Links Details, Estimated Delivery Dates and Financial Summary
Exhibit B:     General Route Map
Exhibit C:     Designated Points of Presence (POPs)
Exhibit D:     Construction Specifications
Exhibit E-1:   Fiber Acceptance Criteria
Exhibit E-2:   Technical Specifications
Exhibit F:     AT&T Link Completion and Fiber Transfer
Exhibit G:     Intentionally Deleted
Exhibit H:     Intentionally Deleted
Exhibit I:     Co-Location in AT&T Regeneration or Optical Amplifier Hut
               Locations
Exhibit J:     Cable Maintenance (Plant protection)

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                    AMENDED AND RESTATED FIBER SALE AGREEMENT

      This Amended And Restated Fiber Sale Agreement (this "Agreement") is made
and entered into on this 27th day of July, 2001, by and between PF.Net Corp., a
Delaware corporation ("Purchaser"), and AT&T Corp., a New York corporation
("AT&T").

                               ADDITIONAL RECITALS

      WHEREAS, by Fiber Sales Agreement dated as of December 9, 2000 by and
between Purchaser and AT&T (the "Original Agreement"), the parties set forth
terms and conditions governing the acquisition by Purchaser from AT&T of certain
rights and interests in a continuous fiber optic communication system (the "AT&T
System") connecting the access points between each of the city pairs as
described in Exhibit A hereto and being referred to as the "System Route"); and

      WHEREAS, the parties desire to amend the Original Agreement in certain
respects, and to accomplish such amendments by amending and restating the
Original Agreement;

      NOW, THEREFORE, the parties do hereby amend and restate the Fiber Sale
Agreement in the following manner:

                                    RECITALS

      A.    AT&T owns, has an interest in, or is planning to construct, the AT&T
System.

      B.    Purchaser desires to own various counts of optical Dark Fibers in
certain Links (each as hereinafter defined) in the AT&T System.

      C.    AT&T desires (i) except with respect to the "IRU Links" (as
hereinafter defined) to convey title, effective as of the "Phase Closing Date"
(as hereinafter defined), to Purchaser for various counts of optical Dark Fibers
(to the extent that it has the right to convey the same, and to grant a right to
use any Dark Fibers that it does not have a right to convey), (ii) with respect
to the IRU Links to grant to Purchaser the right to use the various counts of
optical Dark Fiber in such IRU Links, and (iii) to grant to Purchaser the right
to use Associated Personal Property (as hereinafter defined) in certain Links in
the AT&T System, all upon the terms and conditions set forth below.

      Accordingly, in consideration of the mutual promises set forth below and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto hereby agree as follows:

                                   ARTICLE I
                               CERTAIN DEFINITIONS

      The following terms shall have the stated definitions in this Agreement.

      1.1 "AFFILIATE" means with respect to a specified person or entity, any
person or entity that directly or indirectly, through one or more
intermediaries, controls, is controlled by, or is

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under common control with the specified person or entity. For the purposes of
this definition, the term "control" means the possession, directly or
indirectly, or as trustee or executor, of the power to direct or cause the
direction of the management and policies of a person or entity, whether through
ownership of voting securities, as trustee or executor, by contract or credit
arrangements or otherwise.

      1.2 "ALLOCATED PHASE VALUE" shall mean for the Phase 1 Fibers and Phase 2
Fibers in each Link, the amount set forth for such Phase in such Link on Exhibit
A opposite the phrase "Price to Acquire Dark Fiber Phase 1 Delivery" or "Price
to Acquire Dark Fiber Phase 2 Delivery", as applicable.

      1.3 "AT&T SYSTEM" shall have the meaning ascribed thereto in Recital A.

      1.4 "CABLE" means the fiber optic cable, the fiber contained therein, and
associated splicing connections and enclosures, each to be installed by or on
behalf of AT&T as part of the AT&T System.

      1.5 "CONDUIT" means a tube especially constructed for the purpose of
placing and enclosing fiber optic cable.

      1.6 "CONNECTING POINTS" points in the cable route as mutually designated
by the Parties, from time to time, other than termination panels (LGX)
connections for the purpose of extending Subject Strands outside the AT&T
conduit, manholes, hand holes, cable or right of way.

      1.7 "DARK FIBER" means one or more strands of fiber through which no
associated light, signal or light communication transmission is provided to
furnish service.

      1.8 "ESTIMATED DELIVERY DATE" means, with respect to Phase 1 Fibers and
Phase 2 Fibers in each Link of the AT&T System to be delivered hereunder, the
date set forth in Exhibit A hereto under the column "Estimated Delivery Date
Phase 1" or "Estimated Delivery Date Phase 2" (as applicable) with respect to
such Phase for such Link, as any such date may be extended for and during the
period of any delay described in Article XVIII; provided, however, that
Purchaser may request that the Estimated Delivery Date with respect to Phase 1
and/or Phase 2 in a Link or Links be earlier than the applicable date(s) set
forth in Exhibit A, and if AT&T, in its sole discretion, agrees on such earlier
Estimated Delivery Date, the term Estimated Delivery Date shall mean the earlier
Estimated Delivery Date so established by mutual agreement of the parties, in
which event Exhibit A shall be amended as may be necessary to reflect such
earlier Estimated Delivery Date.

      1.9 "FIBER" means filaments of dielectric material designed for the
purpose of light-wave transmission.

      1.10 "FIBER MILES" with respect to a Link (or Phase in such Link) shall
mean the number of Strands in such Link (or Phase thereof) multiplied by the
number of miles covered by such Link.

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      1.11 "GOVERNMENTAL AUTHORITY" means any legislature, agency, bureau,
branch, department, division, commission, court, tribunal, magistrate, justice,
multi-national organization, quasi-governmental body, or other similar
recognized organization or body of any federal, state, county, municipal, local,
or foreign government or other similar recognized organization or body
exercising similar powers or authority.

      1.12 "IMPOSITIONS" means all taxes, fees, levies, imposts, duties, charges
or withholdings of any nature (including, without limitation, gross receipts
taxes and franchise, license and permit fees), together with any penalties,
fines or interest thereon.

      1.13 "IRU LINKS" shall mean the following numbered Links (the numbers
designating each Link in the AT&T System being those set forth on Exhibit A) for
which the parties have agreed that only a right of use shall be granted to
Purchaser, regardless of whether AT&T might have the legal right to sell all or
part of the Subject Strands in such Links: (a) Link 5, but only with respect to
that portion of such Link between Tampa to Fort Myers, and between Fort Myers
and Miami, (b) Link 25B1, (c) Link 31, (d) Link 32A, (e) Link 32B, (f) Link 32C,
(g) Link 33.1, (h) Link 33.2, (i) Link 35, (j) Link 37A, and (k) Link 49.

      1.14 "LGX PANEL" means terminating equipment that will accommodate various
numbers of strand(s) of Fiber being normally used to terminate and create test
access to individual Fiber strand(s); This panel does not provide any
electronics or other devices that light fiber for use.

      1.15 "LINK" means the subdivisions of the AT&T System by the two terminus
city locations as set forth on Exhibit A and identified by Link number on each
page of Exhibit A.

      1.16 ""LIT FIBER" means Strands with respect to which an associated light,
signal or light communication transmission has been provided.

      1.17 "OPTICAL AMPLIFIER HUTS": means the AT&T physical site where optical
amplifiers are deployed to boost optical signal strength to offset fiber loss;
no provision is available for terminating traffic at an Optical Amplifier Hut.

      1.18 "ORDER" means any order, ruling, decision, verdict, decree, writ,
subpoena, mandate, precept, command, directive, consent, approval, award,
judgment, injunction, or other similar determination or finding by, before, or
under the supervision of any Governmental Authority, arbitrator, or mediator.

      1.19 "PARTIES" means, collectively, AT&T and Purchaser.

      1.20 "PAYMENT DATE" shall mean each of the dates on which a payment of the
Purchase Price is to be made.

      1.21 "PHASE" shall refer to one of the two stages in which Fibers are to
be delivered under this Agreement (such stages being designated as Phase 1 or
Phase 2) as set forth on Exhibit A hereto with respect to each Link.

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      1.22 "PHASE CLOSING DATE" shall mean the date on which the Phase Purchase
Price shall have been paid and the transfer of the Fibers in the applicable
Phase for the relevant Link to Purchaser shall have occurred hereunder.

      1.23 "PHASE 1 FIBERS" shall mean those Fibers to be delivered during Phase
1 for a Link as set forth on Exhibit A with respect to each Link under the
column "Estimated Delivery Date Phase 1".

      1.24 "PHASE 2 FIBERS" shall mean those Fibers to be delivered during Phase
2 for each Link as set forth on Exhibit A with respect to each Link under the
column "Estimated Delivery Date Phase 2".

      1.25 "POP" means various point of presence at locations along the System
Route where Purchaser may request space to install Purchaser's equipment as
described in the POP Co-Location Agreement and the addresses of which are among
those listed in Exhibit C.

      1.26 "REGENERATION FACILITIES HUT" means the AT&T physical site where all
the optical channels on Dense Wavelength Division Multiplex systems must be
regenerated to compensate for accumulated signal impairments.

      1.27 "SEGMENT" means the part of a Link which is defined by a single set
of rights, whether through a single owner and a single right of way granting
document.

      1.28 "SPAN" means the fiber length between two (2) Optical Amplifier (OA)
Hut(s) LGX Panel(s), between an OA Hut and Regeneration (REGEN) Facilities
Hut(s) LGX Panel(s) or between an OA and an AT&T or Purchaser POP LGX Panel(s).

      1.29 "STRANDS" means individual Fiber optic strands within the AT&T
System.

      1.30 "SUBJECT STRANDS" shall mean the various number of Strands sold to
Purchaser or for which Purchaser has been granted the right of use as set forth
in Exhibit A pursuant to this Agreement including Additional Installed Fibers.

      1.31 "TELECOMMUNICATIONS" shall have the meaning as used and interpreted
in 47 U.S.C. Section.153(2)(43).

      1.32 "THIRD PARTY CLAIM" shall mean a claim asserted by a person, not a
Party or an Affiliate of the Party. It shall not include a claim if such third
party's knowledge of facts giving rise to such claim was derived, in whole or in
part, by a disclosure made subsequent to the date hereof by the Purchaser (or
any Affiliate thereof), if a reasonably prudent person would believe that such
disclosure could lead to an otherwise Third Party Claim other than a disclosure
made (i) pursuant to an order from an appropriate governmental entity or (ii) in
a deposition or other discovery proceeding (iii) as reasonably deemed necessary
in an unrelated claim or (iv) that is legally required to be made to any
regulatory authority or to holders or prospective purchasers of Purchaser's
securities (including, without limitation, in a 144A offering memorandum or
prospectus).

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      1.33  The following terms shall have the meaning given such terms in the
Sections set forth beside such terms:

            (a) "Action" in Section 11.3;
            (b) "Additional Defenses" in Section 11.3;
            (c) "Additional Payment" in Section 3.1(b);
            (d) "Agreement" in the Preamble;
            (e) "Applicable Period" in Section 24.2;
            (f) "Associated Personal Property" in Section 2.1;
            (g) "AT&T" in the Preamble;
            (h) "Completion Notice" in Section 5.2;
            (i) "Confidential Information" in Section 26.4;
            (j) "Disclosing Party" in Section 26.4;
            (k) "Event of Default" in Sections 16.2, 16.4, and 16.5;
            (l) "Existing Properties" in Section 23.3;
            (m) "Existing Underlying Rights" in Section 10.1;
            (n) "Fiber Acceptance Criteria" in Section 5.1;
            (o) "Fiber Acceptance Date" in Section 5.2;
            (p) "Finally Determined Taxes and Fees" in Section 14.7;
            (q) "Initial Payment" in Section 3.1;
            (r) "Installation Delay" in Section 4.5;
            (s) "Interest Holder" in Section 9.3;
            (t) "Intermediary" in Section 23.3;
            (u) "Material Deviation" in Section 2.2;
            (v) "Material Fiber Deviation" in Section 24.2;
            (w) "Net Income Based Impositions" in Section 14.5;
            (x) "Notice" in Section 19.1;
            (y) "Officers" in Section 19.1;
            (z) "Payment Default" in Section 16.1;
            (aa) "Phase Purchase Price in Section 3.3;
            (bb) "Potentially Responsible Parties" in Section 4.5;
            (cc) "Proposed Transferee" in Section 23.2(a);
            (dd) "Purchase Price" in Section 3.1;
            (ee) "Purchased Assets" in Section 2.1;
            (ff) "Purchaser" in the Preamble;
            (gg) "Purchaser Review Period" in Section 5.2;
            (hh) "Purchaser's Optional Fiber" in Section 2.4;
            (ii) "Purchaser Strands" in Section 2.1;
            (jj) "Receiving Party" in Section 26.4;
            (kk) "Regulations" in Section 18.1;
            (ll) "Reimbursable Imposition Amount" in Section 14.4;
            (mm) "Right of First Refusal" in Section 23.2(a);
            (nn) "Space Agreement" in Section 2.1;
            (oo) "System Route" in Recital A;
            (pp) "Total RU Portion" in Section 2.1;
            (qq) "Transfer" in Section 23.2;

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            (rr) "Transfer Notice" in Section 23.2(a);
            (ss) "Underlying Rights" in Section 9.1;
            (tt) "Upgraded Subdivision" in Section 2.4.
            (uu) "IRU Links" in Section 2.1

                                   ARTICLE II
                        SALE OF FIBER IN THE AT&T SYSTEM

      2.1 Effective with respect to a Phase 1 Fiber or Phase 2 Fiber for each
particular Link delivered by AT&T to Purchaser hereunder upon the occurrence of
the applicable Phase Closing Date, AT&T hereby agrees to sell to Purchaser, and
Purchaser hereby agrees to purchase from AT&T, (i) except with respect to the
IRU Links, either (a) ownership of and title to the Subject Strands as described
in Exhibit A, or (b) with respect to any Subject Strands located on any Segment
or Link (or other portion of the AT&T System) in which AT&T does not have the
right to sell the Subject Strands as described in Exhibit A, the right to use
such Subject Strands on such Segment (or other portion) for the purposes set
forth herein and (ii) with respect to the IRU Links, the right to use such
Subject Strands on each Link for the purposes set forth herein (the IRU Links
and the portion of the AT&T System provided for in subclause (i)(b) above being
call the "Total RU Portion), the rights in clauses (i) and (ii) to be made
available to Purchaser in the AT&T System in the Links and along the System
Route more specifically described in the maps included in Exhibit B hereto; and
(iii) with respect to the rights under each of clauses (i) and (ii) above, a
license for such Subject Strands to occupy the Conduit in which such Strands are
located, and to the extent provided in Article VII herein and Exhibit I attached
hereto, associated Regeneration Facilities (collectively, the "Associated
Personal Property"), all on the terms and subject to the covenants and
conditions set forth herein (all of the assets and rights described in this are
collectively, the "Purchased Assets"). Those Segments (other than IRU Links) in
which AT&T does not believe it has the right to sell Strands shall be set forth
on a schedule to be delivered to Purchaser on or before December 31, 2001. The
rights in the Fibers acquired by Purchaser pursuant to this Agreement are
referred to collectively as the "Purchaser Strands." The Parties recognize and
agree that Purchaser shall acquire no ownership interest pursuant to the terms
of this Agreement in the fiber optic cable and sheaths in which the Strands are,
or are to be, located. Nothing contained in this Agreement shall grant to
Purchaser any right to enter onto the lands on which the AT&T System is or will
be located, or otherwise physically take possession of, or exercise physical
dominion over, the AT&T System, except as set forth in Exhibit I. It is
recognized and agreed that Purchaser has and shall have no right to use Fibers
included in a Phase for any Link prior to the applicable Phase Closing Date.

      2.2 The Parties acknowledge and agree that the specific route of any Link
that has not been finally designed or engineered, or with respect to which a
right-of-way agreement has not been obtained as of the date hereof, is subject
to final determination by AT&T, based on specific engineering, right-of-way,
permitting, authorization and other requirements; provided, however, that (i) no
deviation in the route of any Link as set forth in the maps included in Exhibit
B shall result in a Material Deviation (as defined below) in the System Route as
set forth in Exhibit B; and (ii) once the final route of any Link has been so
determined, AT&T shall deliver to Purchaser corresponding revisions to the
relevant maps included in Exhibit B hereto. AT&T shall exercise commercially
reasonable efforts to provide prompt notice to Purchaser of any Material
Deviation. As used herein, the term "Material Deviation" shall mean a deviation
in the

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general route of a Link that (A) modifies the System Route architecture in a
manner that breaks a ring, creates a spur or breaks the contiguous nature of
Links or (B) otherwise results in the AT&T System not having the POPs set forth
on Exhibit C.

      2.3 It is understood and agreed as between the Parties, that
notwithstanding any other provision of this Agreement except with respect to the
IRU Links, the sale by AT&T to Purchaser of the Purchased Assets shall be
treated as a sale and purchase for accounting and federal and all applicable
state and local tax purposes, and that from and after the Phase Closing Date
with respect to the Fibers so delivered on such date, Purchaser shall be treated
as the owner of the Purchaser Strands and the other Purchased Assets. The
Parties agree to file their respective income tax returns, property tax returns
and other returns and reports for their respective taxes on such basis and,
except as otherwise required by law, not to take any positions inconsistent
therewith.

      2.4 From and after the Phase 2 Closing Date for each Link (other than
Fibers installed prior to January 1, 2000, for which the rights set forth herein
shall apply from and after the date hereof), if AT&T should choose to install
additional fibers ("Purchaser's Optional Fibers") in all or any portion of such
Link (an "Upgraded Subdivision"), then Purchaser may, at its option in
accordance with the further provisions of this section, participate in all such
fiber placement through the installation of Dark Fiber in such Upgraded
Subdivision of the type it designates in all or any portion of the AT&T System
in which AT&T makes any such upgrade. Purchaser may install any number of fibers
in the Upgraded Subdivision but the number of the Purchaser Optional Fibers
installed pursuant to this Section 2.4 shall not exceed two hundred percent
(200%) (subject to the further provisions hereof) of the total number of Subject
Strands described under Purchaser's Phase 1 Fibers and Purchaser's Phase 2
Fibers in Exhibit A. AT&T shall provide Purchaser notice of its intention to
install such Additional Installed Fiber, and Purchaser shall have the right,
within 90 days after the receipt after such notice, to give written notice to
AT&T of its election to participate in the Additional Installed Fiber in such
Upgraded Subdivision, and if it is electing to do so, the number of Fibers it
elects to have AT&T install. Such written election shall be made by Purchaser
with respect to each Upgraded Subdivision, and shall only apply to the first
Additional Installed Fiber in any Upgraded Subdivision. Should Purchaser fail to
make any written election within the 90 day period, it shall be deemed to have
elected not to participate in the Additional Installed Fiber in such Upgraded
Subdivision. No election made with respect to any Upgraded Subdivision shall
affect Purchaser's election with respect to subsequent Upgraded Subdivision of
such Link or other Links. Purchaser shall reimburse AT&T for the proportional
share of the price of Dark Fiber including shipping, taxes, installation,
splicing and testing installed pursuant to this Section 2.4 (based upon the
number of Fibers which it elects to install to the total number of Fibers
installed by AT&T in such conduit in such Upgraded Subdivision (the
"proportionate completion cost"). With respect to any Upgraded Subdivision in
which Purchaser elects to participate, AT&T shall provide notice not less than
ninety (90) days prior to the completion of such installation an estimate of the
proportionate completion cost, and of the estimated date of which it anticipates
the installation to commence (a "commencement date"). Purchaser shall make
payment to AT&T of the estimated proportionate completion cost on or before the
commencement date, which shall be subject to a true up following the completion
of the installation of the Additional Installed Fiber in such Upgraded
Subdivision, to take place within 90 days following the completion of such
installation. If Purchaser shall fail to make payment for both such Fiber and
for the estimated

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proportionate completion cost on or before the expiration of thirty (30) days
after such commencement date, then AT&T may proceed to sell any such Additional
Installed Fiber in the Upgraded Subdivision, with any proceeds received in such
sale to be offset against the damages otherwise resulting from Purchaser's
failure to make such payment. It is provided, however, that with respect to any
Upgraded Subdivisions in (i) Link 15 between San Jose, California and San
Francisco, (ii) Link 54 between Newark, New Jersey and New York City and (iii)
Link 49 (New York City Metro), Purchaser may only elect to install up to that
number of Purchaser Optional Fibers pursuant to this Section 2.4 which equals
100% of the total number of Phase 1 Fibers and Phase 2 Fibers described on
Exhibit A with respect to such Links. In the event that AT&T does not have a
suitable conduit available for the installation of additional fibers as of the
Phase 2 Closing Date for such Link pursuant to this agreement, AT&T shall credit
an amount equal to One Hundred Fifty ($150) dollars per mile for each of the
Purchaser Optional Fibers described in Exhibit A for all such Links. Such credit
shall be accounted for in the true up described in Section 3.1 below.

                                  ARTICLE III
                    CONSIDERATION FOR SALE AND PAYMENT TERMS

      3.1 (a) In consideration of the sale of the Purchased Assets hereunder by
AT&T to Purchaser, Purchaser agrees to pay or cause to be paid to AT&T in cash
the sum of US One Hundred Ten Million Eight Hundred Ninety Two Thousand Nine
Hundred Sixty Dollars ($110,892,960), subject to adjustment as set forth below,
for all of the Links (which includes for each such Link, the Purchaser Optional
Fibers), which shall be paid as follows: (i) US Eleven Million One Hundred Fifty
Three Thousand Two Hundred Sixteen Dollars ($11,153,216), which shall be payable
by wire transfer within ten (10) days of the execution of this Agreement and US
Ten Million Dollars ($10,000,000) which shall be payable by wire transfer on
June 30, 2001 (together the "Initial Payment") and subject to Section 17 herein,
shall be applied (until fully credited) against the next payments due to AT&T on
the Phase Closing Dates; (ii) US One Million Dollars ($1,000,000) (the "Phase 2
Initial Payment") which shall be payable by wire transfer on July 30, 2004 and
(iii) the Phase Purchase Price for the respective Phases in each Links (less the
Initial Payment and the Phase 2 Initial Payment, as appropriate), to be paid on
the applicable Phase Closing Dates, except with respect to the IRU Links which
will be paid as set forth in paragraph (b) below. Each Phase Purchase Price
shall be subject to a true up no later than ninety (90) days after each Phase
Closing Date, based upon the difference between the estimated mileage for the
applicable Link as set forth in Exhibit A and the actual mileage for such Link
as constructed; provided however, that no such adjustment for Link 18 shall
exceed three percent (3%) of the total of "Price to Acquire Dark Fiber Phase 1
Delivery" and "Price to Acquire Dark Fiber Phase 2 Delivery" as set forth for
such Link on such Exhibit A. The aggregate adjustment to be made pursuant to the
preceding sentence shall be reflected by an increase or decrease to the final
payment due to AT&T.

      (b) The Phase Purchase Price for Phase 1 of each of the IRU Links shall be
payable in equal amounts, the first to be payable on the Phase 1 Closing Date,
and the remainder on the anniversary dates of the Phase 1 Closing Date for such
Links ("Additional Payment Dates") in the years set forth on Exhibit A therefor
(but not including the year of the Estimated Delivery Date Phase 2, as set forth
in such exhibit) for which an amount is set forth under the columns "2002
Payments", "2003 Payments" or "2004 Payments"(the "Payment Years"); provided,

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however, that if the Phase 1 Closing Date with respect to a Link does not occur
in the same year as the Estimated Delivery Date Phase 1, the Payment Years shall
be adjusted to reflect the appropriate years of the succeeding anniversary
date(s) of the actual Phase 1 Closing Date. It is further provided that if any
Additional Payment Date does not fall on a Business day, such Additional Payment
Date shall occur on the next business day following such anniversary date. Each
of the payments of the Phase Purchase Price for Phase 1 for the IRU Links, if
made, shall entitle Purchaser to the use of the Fibers included in such Phase
for such IRU Links as contemplated hereby for the period commencing on the date
such payment is due to the next Additional Payment Date; provided, however, that
if the final payment for Fibers in Phase 1 is made on the relevant Additional
Payment Date, the rights of Purchaser in the Fibers in such Phase for such IRU
Link shall remain in force and effect for the duration of the Underlying Rights
(as such Underlying Rights may be extended (or assigned to Purchaser) pursuant
to the terms of Section 9.2(b) hereof). The Phase Purchase Price for Phase 2 of
each of the IRU Links shall be payable in full on the Phase 2 Closing Date.

      3.2 All payments in excess of five thousand ($5,000) to be made by either
party hereunder shall be made by wire transfer of immediately available funds in
United States dollars to the account or accounts of the payee in writing from
time to time.

      3.3 The Phase Closing Date with respect to Phase 1 Fibers for each Link
shall occur within thirty (30) calendar days after the Fiber Acceptance Date for
such Link, at a time to be specified by AT&T in a notice to Purchaser, which
shall specify the applicable Links and the Allocated Phase Value thereof. The
Phase Closing Date with respect to Phase 2 Fibers for each Link shall occur on
the Estimated Delivery Date Phase 2 (as set forth on Exhibit A), as such
Estimated Delivery Date may be extended pursuant to the terms of Article XVIII
hereof. On the Phase Closing Date (except with respect to the IRU Links),
Purchaser shall pay to AT&T in cash amount equal to the Allocated Phase Value of
the applicable Phase for such Link(s) (the "Phase Purchase Price"). Upon receipt
of the Phase Purchase Price, AT&T shall execute and deliver to Purchaser any
transfer documents relating to the Fibers in the applicable Phase in such Link
and the related Purchased Assets which may be reasonably requested by Purchaser,
which transfer documents shall not provide to Purchaser any representations,
warranties or covenants not otherwise specifically provided herein, all of which
shall survive the Phase Closing Date and not merge into such transfer documents.

      3.4 Notwithstanding the provisions of Section 3.3 above, Purchaser may
extend the Phase Closing Date(s) with respect to Phase 1 Fibers for one or more
Links to a date not later than ninety (90) days after the Fiber Acceptance
Date(s) for any such Phase, provided that Purchaser has given AT&T written
notice of its intention to do so not less that sixty (60) days prior to the
Estimated Delivery Date for that Link. In the event that Purchaser exercises its
right to extend a Phase 1 Closing Date, such notice must be accompanied by a
down payment of ten percent (10%) of the Phase 1 Purchase Price for such Link in
order for such Notice to be effective.

      3.5 Concurrently with the execution of this Agreement, the Parties have
executed and delivered the POP Co-Location Agreement, which shall be effective
as of the date hereof. The consideration payable to AT&T as set forth in this
Article III shall be separate from, and in addition to, the consideration
payable under the POP Co-Location Agreement and Exhibit I.

                                       9

<Page>

                                   ARTICLE IV
                         CONSTRUCTION OF THE AT&T SYSTEM

      4.1 AT&T has effected or shall effect the design, engineering,
installation, and construction of those portions of the AT&T System as of the
date hereof in accordance with the System Route (as it may be modified pursuant
to Section 2.2) and in conformity with (i) the construction specifications set
forth in Exhibit D and E1 and (ii) the manufacturer's specifications set forth
in Exhibit E2.

      4.2 Subject to extension for delays described in Article XVIII, AT&T shall
complete or cause to be completed at AT&T's sole cost and expense, all
construction, installation, and satisfactory Fiber acceptance testing for each
of the Links, including the provision of such Regeneration Facilities on such
Link as are required to be provided pursuant to the Exhibit I and the
Co-Location Agreement, by the applicable Estimated Delivery Date; provided
however that the only remedies for failure to comply with this section are set
forth in Section 4.5 below.

      4.3 Except as may be provided herein, AT&T shall, at AT&T's sole cost and
expense, including Impositions procure all materials to be incorporated in and
to become a permanent part of the AT&T System, including, without limitation,
the Regeneration Facilities required to be provided pursuant to the Space
Agreement.

      4.4 AT&T shall perform, at AT&T's sole cost and expense, substantially in
accordance with AT&T's customary standards and practices and as deemed necessary
or appropriate in AT&T's reasonable business judgment, all supervisory and
inspection services relating to the construction of the AT&T System. During the
course of the construction period of any Link not yet completed, AT&T shall
prepare and provide to Purchaser a construction schedule and progress reports
periodically. Upon reasonable notice to AT&T, Purchaser shall have the right,
but not the obligation, to inspect the construction of each Link, including the
installation, splicing and testing of the Purchaser Strands incorporated
therein, during the course and at the time of the relevant design, construction
and installation period during regular business hours.

      4.5 If the completion of the construction, installation, satisfactory
Fiber acceptance testing and a Completion Notice for the Subject Strands
concerning a particular Link for Phase 1 Fibers has not occurred or been given
by the Estimated Delivery Date for such Phase 1 Fibers as set forth on Exhibit A
("Installation Delay"), AT&T will diligently pursue any action it may have
against any contractors, subcontractors and other third parties who may be
responsible for such Installation Delay ("Potentially Responsible Parties") to
the same extent that it would if AT&T owned the entire interest in the AT&T
System. In the event that AT&T does not provide a satisfactory Completion Notice
prior to ninety (90) days after the Estimated Delivery Date Phase 1 for any
particular Link subject to Article 18.1, then Purchaser shall be entitled to the
following as Liquidated Damages: Beginning on the ninety first day after the
Estimated Delivery Date Phase 1, Seventy Five Thousand ($75,000) Dollars per
month for each Link not completed, subject to a limit (the "Cap") of five
percent (5%) of the total Allocated Phase Value for Phase 1 and Phase 2 of such
Link set forth on Exhibit A. If the Completion Notice is not given by the
earlier of (a) the date on which the Cap for such Link is reached, unless AT&T
elects, at its discretion, to waive the Cap and continue the payment, or (b) the
expiration of eight (8) months

                                       10

<Page>

from the Estimated Delivery Date Phase 1, Purchaser may elect to delete such
Link from this Agreement and be refunded any deposit made by Purchaser with
respect to such Link. Upon Purchaser's written request, AT&T shall make
available for inspection by Purchaser, at AT&T's offices during regular business
hours, upon reasonable notice to AT&T with such notification to be made at least
fourteen (14) business days in advance, copies of all information, documents,
agreements, reports, permits, drawings and specifications generated, obtained or
acquired by AT&T in performing its duties pursuant to this Article IV that are
material to the sale of the Purchased Assets to Purchaser, subject only to the
conditions that (i) the terms of each such document or the legal restrictions
applicable to such information or document permit disclosure; provided however
that AT&T would represent that no such documents omitted would contain
information which would result in a material adverse effect on the Subject
Strands.

      4.6 If requested by Purchaser, AT&T shall deliver to Purchaser as built
drawings with respect to any Link with reasonable promptness after receiving
such a request.

                                   ARTICLE V
                   ACCEPTANCE AND TESTING OF PURCHASER STRANDS

      5.1 Prior to the Purchaser's acceptance of any Link, AT&T has completed or
shall have completed testing on such Link to determine whether the Purchaser
Strands meet the technical specifications provided in Exhibit E1 and E2. Such
testing shall be conducted in accordance with the fiber acceptance testing
procedures specified in Exhibit E-1 ("Fiber Acceptance Criteria") and shall
progress span by span along each Link as cable splicing progresses, so that test
results may be reviewed in a timely manner. For any Links or portions thereof
where fiber acceptance testing has not yet been completed; and if notified by
Purchaser in writing not less than fourteen (14) days in advance of the date
that such testing is estimated to take place according to a schedule to be
supplied by AT&T to Purchaser. Upon request therefor by Purchaser, AT&T shall
provide Purchaser with the available testing schedule indicating AT&T's current
view of the time and location for each fiber acceptance testing for Span(s)
between LGX Panel locations. To the extent that the applicable testing schedule
is not available when requested by Purchaser, AT&T shall advise Purchaser of the
time at which it expects such schedule to be available. Purchaser shall have the
right to arrange with the AT&T personnel coordinating fiber testing to observe
such testing by arranging to be at the specified test location(s) when AT&T is
conducting such fiber testing. It shall be the Purchaser's obligation to
coordinate any such visits in accordance with AT&T's current schedule.

      5.2 When AT&T reasonably determines in good faith that the Purchaser
Strands with respect to an entire Link are installed and operating in conformity
with the applicable specifications set forth in Exhibit(s) E-1 and E-2 including
provisioning of required space for the Purchaser's initial requirements in
AT&T's Regeneration and Optical Amplifier Huts for the purpose of placement of
the Purchaser's Optical Amplifier and associated equipment (provided that AT&T
has been notified in writing of the Purchaser's racking and power requirements
at least sixty (60) days in advance of the Estimated Delivery Date Phase 1 for
such Link), AT&T shall promptly provide written notice (a "Completion Notice")
of same to Purchaser accompanied by the acceptance test results containing the
HSLGX to HSLGX loss readings in CD Rom or written format, if not previously
provided. It is provided, however, that if (a) the Estimated Delivery Date Phase
1 is extended pursuant to the provisions of Article XVIII hereof,

                                       11

<Page>

or (b) if the Phase Closing Date for Phase 1 Fibers with respect to such Link
shall be extended, Purchaser's notice with respect to its racking and spacing
requirements shall be deemed timely as long as the same is given to AT&T sixty
(60) days in advance of the extended Estimated Delivery Date or the revised
Phase 1 Closing Date, as applicable. In no event will AT&T deliver a Completion
Notice with respect to any Link prior to the Estimated Delivery Date for the
entire Link without the written consent of Purchaser. Purchaser shall, within
fourteen (14) days of receipt of the Completion Notice, either reject the
Completion Notice specifying, in good faith, the reasons for rejection or give
AT&T written notice of acceptance (the period from the date of Purchaser's
receipt of the Completion Notice to the date of AT&T's receipt of Purchaser's
notice of rejection or acceptance being referred to herein as the "Purchaser
Review Period"). In the event Purchaser rejects the Completion Notice, AT&T
shall promptly, and not later than twenty-one (21) days, and at no cost to
Purchaser, commence to remedy the defect or failure. Thereafter AT&T shall again
give Purchaser a Completion Notice with respect to such Purchaser Strands. If
Purchaser again rejects the Completion Notice, either Party may elect to refer
this matter to the dispute resolution procedure set forth in Article XIX. Any
failure by Purchaser to timely reject a Completion Notice as set forth above
shall conclusively be a deemed acceptance of such Completion Notice for purposes
of this Agreement. The date when Purchaser accepts or is deemed to have accepted
a Completion Notice with respect to a Link is herein defined as the "Fiber
Acceptance Date." Notwithstanding anything to the contrary in this Agreement,
Purchaser may only reject any specific Completion Notice for defects or failures
in the Fiber delivered or remedial work performed pursuant to that Completion
Notice, and may not reject any specific Completion Notice for defects or
failures in Fiber delivered or remedial work performed pursuant to an earlier
Completion Notice which Purchaser did not specifically identify in a rejection
of that earlier Completion Notice.

                                   ARTICLE VI
                                  DOCUMENTATION

      6.1 INTENTIONALLY DELETED

                                  ARTICLE VII
             NETWORK ACCESS AND MAINTENANCE; REGENERATION FACILITIES

      7.1 AT&T and Purchaser shall on the date hereof enter into the POP
Co-Location Agreement. Exhibit I relates to AT&T's hut locations that provide
for the co-location of Purchaser's equipment, the interconnection of the Subject
Strands, the provision by AT&T of Regeneration OP/ Amp Facilities and other
equipment necessary for the use of the Subject Strands, and the operation and
maintenance of the AT&T System. Access to the Purchaser's fibers following
acceptance shall be made at an LGX Panel or at other termination devices that
are substantially the same as an LGX Panel unless otherwise agreed upon.

            (a) From and after the Phase Closing Date with respect to Fibers
      included in the applicable Phase for a Link, the maintenance of the
      portion of the AT&T System comprising the Fibers in such Phase shall be
      provided in accordance with the maintenance requirements and procedures
      set forth in the Plant Protection Maintenance Agreement (Exhibit J). The
      fees and costs for Plant Protection are set forth in Exhibit J.

                                       12

<Page>

            (b) In the event the Purchaser requires future connections to the
      cable at new LGX Panels or Connecting Points in the cable requested by
      Purchaser, the connecting points requested by the Purchaser will be
      subject to AT&T's consent, prior to permitting such access. The Connecting
      Points in a Link will be limited based on the Parties' mutual agreement
      regarding fiber optic loss criteria, manhole and hand hole access and the
      number of splice points and slack loops left in the cable. This access
      shall be made by cable stub or other substantially similar method and
      taken to the Purchaser requested handoff point which will be outside of
      AT&T's cable, manholes, hand holes, right of way or other like facilities.
      The consent required by AT&T hereunder shall not be unreasonably withheld
      and shall be consistent with sound management and engineering practices.

            (c) AT&T will perform or cause to perform any such connections.

            (d) For any future cable connections required in the Subject Fibers
      by the Purchaser, Purchaser shall notify AT&T in writing not less than
      ninety (90) days in advance of the date the connection is requested to be
      completed. Planned cable intrusions (PCI) or other work activities
      contemplated by this section and the actual connection date will be
      coordinated by the Parties and unless restricted by law, government
      entities, right of way owners or permitting agencies, will be completed no
      later than thirty (30) days after the requested date by Purchaser unless
      mutually agreed by both Parties.

            (e) In addition to the Purchase Price payable under Article III
      above, Purchaser shall reimburse AT&T for cable connection at the actual
      costs thereof including materials used and labor plus 15% which amount(s)
      shall be paid by the Purchaser within thirty (30) days of the date of
      receipt for the invoice provided by AT&T.

                                  ARTICLE VIII
                                   OPERATIONS

      8.1 To the extent consistent with the other provisions of this Agreement,
Purchaser shall have full and complete control and responsibility for
determining any network and service configuration or designs, routing
configurations, re-grooming, rearrangement or consolidation of channels or
circuits and all related functions with regard to the use of Purchaser's Fibers.

                                   ARTICLE IX
                     PERMITS; UNDERLYING RIGHTS; RELOCATION

      9.1 AT&T covenants and agrees that it shall obtain during the course of
construction of, and in any event on or before the completion of Conduit
installation with respect to, each Link to be delivered hereunder, all rights,
licenses, permits, authorizations, and approvals (including, without limitation,
any necessary local, state, federal or tribal authorizations and environmental
permits) that are necessary in order to permit AT&T to construct, install,
operate and maintain and transfer the license for the Subject strands to occupy
the Conduit in which the Subject Strands are (or shall be) located to be
encompassed in such Link and construct, install,

                                       13

<Page>

operate maintain and convey ownership or the right of use of the Subject Strands
for the purposes set forth herein (collectively, the "Underlying Rights"). In
the event that AT&T fails to fulfill its obligations in the preceding sentence,
the Purchaser's sole remedy will be as set forth in this Section 9.1 (except as
set forth in 11.1.1 of this Agreement). If a Third Party Claim shall be asserted
with respect to a Link, which would if the facts alleged therein were true
result in AT&T not having the legal right to permit the Subject Strands to be
located on the lands covered by the Underlying Rights and/or transfer the
license for the Subject Strands to occupy the conduit to Purchaser or other wise
prevent Purchaser from being entitled to the interests in the subject Strands
contemplated by clause (i) and (ii) in Article 2.1 (a "Loss of Rights"), AT&T
shall defend such Third Party Claim at its sole cost and expense, and shall
indemnify Purchaser against any damages that might be assessed against Purchaser
arising from such Third Party Claim except to the extent arising from acts or
omissions of Purchaser. If such Third Party Claim results in a Loss of Rights,
then AT&T shall either (a) acquire the necessary legal right to permit the
Subject Strands to be located on the lands comprising such Segment, (b) relocate
such Segment at AT&T's sole cost and expense in accordance with the provisions
of Section 9.3 below, or (c) be responsible for all actual damages sustained by
Purchaser (without giving effect to the provisions of Article XII hereof) as a
result of the Loss of Rights regarding such Segment, but in no event shall such
damages with respect to any Segment(s) in a Link exceed the "Proportionate Part
(as hereinafter defined) of the Phase Purchase Price attributed to such Link. As
used herein, the term "Proportionate Part" shall mean (A) with respect to a Loss
of Rights occurring within 10 years from the Phase Closing Date, as determined
separately with respect to each Phase (the "10 Year Period"), 100% of the Phase
Purchase Price attributable to Fibers included in such Phase for such Link, and
(B) with respect to a Loss of Rights occurring after the 10 Year Period, that
portion of the Phase Purchase Price attributable to the applicable Link,
multiplied by the following fraction: (A) the numerator of such fraction shall
be the remainder derived by subtracting from 180 the number of months which have
elapsed (if any) from the Ten Year Period to the date that the Loss of Rights
causes Purchaser to terminate its use of the Fibers in the applicable Phase for
such Link; (B) the denominator of such fraction shall be 180. The remedies set
forth in this section shall be Purchaser's sole remedies with respect to all
matters covered by this Section 9.1, without regard to whether such matter might
otherwise constitute an actionable breach of a covenant hereunder or a default
of AT&T hereunder.

      9.2 AT&T further covenants and agrees that, with respect to each
Underlying Right that is necessary in order to own the Purchaser Strands sold
hereunder, and to permit Purchaser to exercise its rights to use the Associated
Property:

            (a) AT&T shall observe and perform, in all material respects, its
      obligations under each document, agreement or instrument granting or
      conveying such Underlying Right to AT&T; and

            (b) If the stated term of such Underlying Right expires less than
      twenty seven years (27) from December 9, 2000, then prior to such
      expiration, AT&T shall exercise any renewal rights it has, and shall
      exercise its best effort to obtain any renewal rights thereunder, or
      otherwise acquire such extensions, additions and/or replacements as may be
      necessary, in order to cause the stated term thereof to be continued for
      an additional period or periods lasting until the earlier of (A) twenty
      seven (27) years from December 9, 2000 or (B) the expiration of the
      economically useful life of the applicable Subject

                                       14

<Page>

      Strands, as reasonably determined by Purchaser. In the event that AT&T has
      the right to renew the term of such Underlying Rights for a term extending
      beyond twenty seven (27) years from the date hereof, or the economic
      useful life of the Subject Strands and chooses not to exercise such
      rights, AT&T shall assign the right to Purchaser to the extent it has the
      right to do so, then Purchaser shall have the right at its sole cost and
      expense to exercise such renewal rights for the Purchasers Subject
      Strands. With respect to the Total RU Portion, the term of the right of
      use to be acquired by Purchaser therein shall be for the full term of the
      Underlying Rights of AT&T therein, with AT&T having the same obligations
      (and Purchaser having the same rights) under this Section 9.2(b)
      pertaining to such Total RU Portion as exist under this section with
      respect to the remainder of the Subject Strands. It is provided, however,
      that notwithstanding any other provision hereof, with respect to Links
      33.1 and 33.2, while AT&T agrees to exercise any renewal rights it may
      have or to assign any renewal rights it does not intend to exercise to
      Purchaser with respect to such Links, AT&T shall have no obligations to
      obtain any renewal rights (or extensions, additions and/or replacements
      thereto) with respect to the Underlying Rights in such Link.

      9.3 If, after the Phase Closing Date with respect to any portion of a
Link, AT&T is required to relocate all or part of a Link by a third party with
legal authority to so require (including, without limitation, the grantor of an
Underlying Right), Purchaser shall reimburse AT&T for its proportionate share of
the costs of such relocation of the portion of the Link so relocated, reduced by
such amount, if any, of the portion of such costs as are reimbursed to AT&T by
the party requiring such relocation, as follows: (i) if the affected portion of
the Link includes any Conduit other than the Conduit housing the Subject Strands
for which AT&T is responsible for relocation costs, the total costs of
relocation of the Conduits (e.g., relocation of the Conduits only without regard
to whether the Conduits contain fibers) shall be allocated based on the overall
number of Conduits relocated; (ii) such costs allocated to the Conduit carrying
the Purchaser Strands plus the costs associated with the relocation of the Fiber
shall be further allocated to Purchaser based on Purchaser's proportionate share
of (A) all costs of Fiber acquisitions, splicing and testing, prorated based on
the total fiber count in the affected Cable, as so relocated, and (B) all other
costs associated with the relocation of the Conduit housing the affected Cable,
prorated based on (x) the total number of owners (including AT&T) and holders of
a right of use or equivalent interests (including long-term lessees) (each, an
"Interest Holder") in the affected Cable, as so relocated and (y) the numbers of
fibers to which such owners' interest relates. If such relocation is necessary
as a result of a Third Party Claim of AT&T's failure to fulfill its obligations
as set forth in Section 9.1 or a failure of AT&T to observe and perform its
obligations under such Underlying Rights or this Agreement, then any such
relocation shall be at AT&T's sole cost and expense. For a period of one (1)
year from the date such relocation is commenced, Purchaser shall have the right
to review and audit all costs incurred in connection with such relocation. If
requested by Purchaser, AT&T shall deliver to Purchaser updated as built
drawings with respect to the relocated Link. Any condemnation or taking under
the power of eminent domain of all or any portion of a Link shall be deemed a
relocation required by a third party with legal authority to so require, and
such affected Link, or portion thereof, shall be relocated in accordance with
this Section 9.3 and any condemnation proceeds received by AT&T (net of all
costs incurred by AT&T in connection therewith) shall be applied to such
relocation as provided above.

                                       15

<Page>

      9.4 Notwithstanding the other provisions of this Agreement, all
franchises, operational licenses and other similar governmental approvals
required for the use of the Strands for Purchaser's business, shall be
Purchaser's sole responsibility.

                                   ARTICLE X
                               USE OF AT&T SYSTEM

      10.1 INTENTIONALLY DELETED

      10.2 Purchaser represents, warrants and covenants that it will use the
Purchased Assets in compliance with (i) all applicable government codes,
ordinances, laws, rules, regulations and/or restrictions, and (ii) the
Underlying Rights.

      10.3 AT&T agrees and acknowledges that, except as provided in the Space
Agreement, it has no right to use the Purchaser Strands included in any Phase
from and after the Phase Closing Date through the remainder of the period in
which Purchaser's rights hereunder in the applicable Purchaser Strands shall
remain in force and effect pursuant to the other terms hereof.

      10.4 Purchaser shall keep any and all of the AT&T System, other than the
Purchased Assets, free from any liens, rights or claims of any third party
attributable to Purchaser.

      10.5 Purchaser and AT&T shall promptly notify each other of any matters
pertaining to, or of the occurrence (or impending occurrence) of, any event
which could give rise to any damage or impending damage to, or loss of, the AT&T
System that are known to such Party. Without limiting the generality of the
foregoing, AT&T shall promptly forward to Purchaser a copy of any notice of
default received by AT&T with respect to its obligations under any Underlying
Right if such default is not promptly cured by AT&T and would, if not cured,
materially and adversely affect the Purchased Assets.

      10.6 Purchaser shall not use the Subject Strands in a way which physically
interferes in any way with or adversely affects the use of the Fibers or Cable
of any other person or entity using the AT&T System, it being expressly
acknowledged that the AT&T System includes or will include other participants,
including AT&T and other owners or users of Strands or Fiber and
telecommunication system operations. AT&T shall not use, or permit any third
party to use, any other Fibers in the AT&T System in a way which materially
interferes with or adversely affects the use of the Purchaser Strands.

      10.7 Purchaser and AT&T each agree to cooperate with and support the other
in complying with any requirements applicable to their respective rights and
obligations hereunder by any governmental or regulatory agency or authority.

                                   ARTICLE XI
                                 INDEMNIFICATION

      11.1 (a) Subject to the provisions of Articles XII and XVI, AT&T hereby
releases and agrees to indemnify, defend, protect and hold harmless Purchaser,
its affiliates and each of their employees, officers and directors, from and
against, and assumes liability for:

                                       16

<Page>

            (i) any injury, loss or damage to any person or entity (including
      Purchaser), or to the tangible property or facilities of any person or
      entity (including reasonable attorneys' fees and costs) to the extent
      arising out of or resulting a default by AT&T in the performance of its
      obligations or breach of its representations under this Agreement; and

            (ii) any claims, liabilities or damages, including reasonable
      attorneys' fees and costs, arising out of any violation by AT&T of any
      regulation, rule, statute or court order of any local, state or federal
      governmental agency, court or body in connection with the performance of
      its obligations under this Agreement.

      (b) Subject to the provisions of Articles XII and XVI, Purchaser hereby
releases and agrees to indemnify, defend, protect and hold harmless AT&T, its
affiliates and each of their employees, officers and directors, from and
against, and assumes liability for:

            (i) any injury, loss or damage to any person or entity (including
      AT&T), or to the tangible property or facilities of any person or entity
      (including reasonable attorneys' fees and costs) to the extent arising out
      of or resulting from a default by Purchaser in the performance of its
      obligations or breach of its representations under this Agreement
      (including, without limitation, any default by Purchaser in the
      performance of its obligations under Article X with respect to its use of
      the AT&T System); and

            (ii) any claims, liabilities or damages, including reasonable
      attorneys' fees and costs, arising out of any violation by Purchaser of
      any regulation, rule, statute or court order of any local, state or
      federal governmental agency, court or body in connection with its use of
      the Purchased Assets or the performance of its obligations under this
      Agreement.

      11.2 The Parties agree to promptly provide each other with notice of any
lawsuit, judicial, administrative or other dispute resolution action or
proceeding, or claim of which it becomes aware and which it believes may result
in an indemnification obligation hereunder (each, an "Action"); PROVIDED that
the failure to provide any such notice shall not affect the indemnifying Party's
indemnification obligation unless the indemnifying Party is actually prejudiced
by the failure to receive such notice. After receipt of any such notice, if the
indemnifying Party shall agree to do so, then the indemnifying Party shall be
entitled, (i) to take control of the defense and investigation of such Action,
(ii) to employ and engage attorneys of its own choice to handle and defend the
same, at the indemnifying Party's cost, risk and expense unless the named
parties to such action or proceeding include both the indemnifying Party and the
indemnified Party and the indemnified Party has been advised in writing by
counsel that there may be one or more legal defenses available to such
indemnified Party that are different from or additional to those available to
the indemnifying Party ("Additional Defenses"), in which case the indemnified
Party shall also have the right to employ its own counsel in any such case to
deal with its Additional Defenses with the reasonable fees and expenses of such
counsel being borne by the indemnifying Party, and (iii) to compromise or settle
such Action, which compromise or settlement shall be made only with the written
consent of the indemnified Party, such consent not to be unreasonably withheld.
Notwithstanding anything in this Section 11.3 to the contrary, (i) if there is a
reasonable probability that an indemnifiable claim may materially

                                       17

<Page>

adversely affect the indemnified Party, other than as a result of money damages
or other money payments, the indemnified Party shall have the right to
participate in such defense, compromise or settlement and the indemnifying Party
shall not, without the indemnified Party's written consent (which consent shall
not be unreasonably withheld), settle or compromise any indemnifiable claim or
consent to entry of any judgment in respect thereof unless such settlement,
compromise or consent includes as an unconditional term thereof the giving by
the claimant or the plaintiff to the indemnified Party a release from all
liability in respect of such indemnifiable claim.

      11.3 Nothing contained herein shall operate as a limitation on the right
of either Party to bring an action for damages against any third party,
including but not limited to indirect, special or consequential damages, lost
revenues and profits based on any acts or omissions of such third party as such
acts or omissions may affect the construction, operation or use of the Subject
Strands or the AT&T System; PROVIDED, HOWEVER, that each Party shall, execute
such documents and do whatever else may be reasonably necessary to enable the
other Party to pursue any such action against such third party. The obligations
of the Parties under this Article XI shall survive any termination of this
Agreement.

                                  ARTICLE XII
                             LIMITATION OF LIABILITY

      12.1 Notwithstanding any provision of this Agreement to the contrary,
except to the extent caused by its own willful misconduct, neither Party shall
be liable to the other Party for any special, incidental, indirect, punitive or
consequential damages, whether foreseeable or not, arising out of, or in
connection with such Party's failure to perform its respective obligations or
breach of its respective representations hereunder, including, but not limited
to, loss of profits or revenue (whether arising out of transmission
interruptions or problems, any interruption or degradation of service or
otherwise), cost of capital, or claims of customers, in each case whether
occasioned by any construction, reconstruction, relocation, repair or
maintenance performed by, or failed to be performed by, the other Party or any
other cause whatsoever, including breach of contract, breach of warranty,
negligence, or strict liability, all claims with respect to which such special,
incidental, indirect, punitive or consequential damages are hereby specifically
waived. Nothing contained herein shall be construed to affect AT&T's obligations
as set forth in Section 4.5, which the Parties acknowledge are the sole rights
and remedies for Installation Delays.

                                  ARTICLE XIII
                                    INSURANCE

      13.1 During the construction period with respect to any Link, and until
the initial Phase Closing Date with respect thereto, AT&T shall maintain and
require its subcontractors to procure and maintain in force the following
insurance coverage from companies lawfully approved to do business in the state
where the construction will be performed:

            (a) not less than $5,000,000 combined single-limit commercial
      general liability insurance, on an occurrence basis, for personal injury
      and property damage, including, without limitation, injury or damage
      arising from the operation of equipment and liability for completed
      operations;

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<Page>

            (b) workers' compensation insurance in amounts required by
      applicable law and employers' liability insurance with a limit of at least
      $1,000,000 per claim;

            (c) automobile liability insurance covering death or injury to any
      person or persons, or damage to property arising from the operation of
      vehicles, with limits of not less than $2,000,000 per occurrence;

            (d) umbrella liability insurance shall be provided with combined
      single limit for bodily injury and property damage of not less than
      $50,000,000 per occurrence and annual aggregate; and

            (e) any other insurance coverage's, including railroad protective
      liability insurance with combined single limit for bodily injury and
      property damage of not less than $2,000,000 per occurrence and $6,000,000
      annual aggregate, required pursuant to AT&T's right-of-way agreements with
      railroads or other third parties.

      13.2 AT&T shall require its subcontractors who are engaged in connection
with the construction of the AT&T System to maintain insurance in the types and
amounts as would be obtained by a prudent person to provide adequate protection
against loss. In all circumstances, AT&T shall require its subcontractors to
carry a minimum limit of $1,000,000 per occurrence or claim and in the aggregate
in commercial general liability, and employers' liability, as well as workers'
compensation insurance in amounts required by applicable law. Purchaser shall be
listed as an additional insured on all policies set forth above, except workers'
compensation. AT&T shall provide to Purchaser a certificate of insurance
evidencing such insurance coverage. Evidence of insurance furnished shall
contain a clause stating Purchaser "shall be notified in writing prior to any
cancellation of, or any material change or new exclusions in the policy."

      13.3 Following the initial Phase Closing Date with respect to each Link,
each Party shall procure and maintain in force, at its own expense:

            (a) not less than $5,000,000 combined single limit commercial
      general liability insurance, on an occurrence basis, for personal injury
      and property damage, including, without limitation, injury or damage
      arising from the operation of vehicles or equipment and liability for
      completed operations;

            (b) workers' compensation insurance in amounts required by
      applicable law and employers' liability insurance with a limit of at least
      $1,000,000 per claim;

            (c) automobile liability insurance covering death or injury to any
      person or persons, or damage to property arising from the operation of
      vehicles, with limits of not less than $2,000,000 per occurrence;

            (d) umbrella liability insurance shall be provided with combined
      single limit for bodily injury and property damage of not less than
      $50,000,000 per occurrence and annual aggregate; and

            (e) any other insurance coverages with combined single limit for
      bodily injury and property damage of not less than $2,000,000 per
      occurrence and $6,000,000 annual

                                       19

<Page>

      aggregate, specifically required of such party pursuant to AT&T's
      right-of-way agreements with railroads or other third parties.

      13.4 Both Parties expressly acknowledge that a Party shall be deemed to be
in compliance with the provisions of this Article XIII if it maintains an
approved self insurance program providing for a retention of up to $1,000,000.
If either Party provides any of the foregoing coverages on a claims-made basis,
such policy or policies shall be for at least a three-year extended reporting or
discovery period. Unless otherwise agreed, Purchaser's and AT&T's insurance
policies shall be obtained and maintained with companies rated "A" and financial
size Category Class VII or better by Best's Key Rating Guide and each Party
shall provide the other with an insurance certificate confirming compliance with
this requirement for each policy providing such required coverage.

      13.5 In the event either Party fails to obtain the required insurance or
to obtain the required certificates from any contractor and a claim is made or
suffered, such Party shall indemnify and hold harmless the other Party from any
and all claims for which the required insurance would have provided coverage.
Further, in the event of any such failure which continues after seven (7) days'
written notice thereof by the other Party, such other Party may, but shall not
be obligated to, obtain such insurance and will have the right to be reimbursed
for the cost of such insurance by the Party failing to obtain such insurance.

      13.6 In the event coverage is denied or reimbursement of a properly
presented claim is disputed by the carrier for insurance provided above, the
Party carrying such coverage shall make good-faith efforts to pursue such claim
with its carrier.

      13.7 Each of Purchaser and AT&T shall obtain from the insurance companies
providing the coverages required by this Agreement the permission of such
insurers to allow such Party to waive all rights of subrogation, and such Party
does hereby waive all rights of said insurance companies to subrogation, against
the other Party, its parent corporation, affiliates, subsidiaries, assignees,
officers, directors, and employees or any other person or entity entitled to
indemnity under this Agreement.

                                  ARTICLE XIV
                  TAXES AND FRANCHISE, LICENSE AND PERMIT FEES

      14.1 As used in this Article 14, "Tax" or "Taxes" shall mean any and all
taxes, fees, franchise fees, assessments, charges, duties, levies, charges or
withholdings of any nature, together with any penalties, fines or interest
thereon, imposed by any authority having the power to tax, including any city,
county, state or federal governmental or quasi-governmental agency or taxing
district.

      14.2 It is understood and agreed as between the Parties, that
notwithstanding any other provision of this Agreement, the sale by AT&T to
Purchaser of the Purchased Assets shall be treated as a sale and purchase for
federal, state, local and foreign Tax purposes, and that from and after the
Phase Closing Date with respect to any Fibers delivered to Purchaser in
connection with such closing, Purchaser shall be treated as the owner of the
Purchaser Strands so delivered and the other Purchased Assets for all Tax
purposes. The Parties agree to file their respective

                                       20

<Page>

income Tax returns, property Tax returns and other returns and reports for their
respective Taxes on such basis and, except as otherwise required by law, not to
take any positions inconsistent therewith. Purchaser shall be responsible for
all sales, use and other similar Taxes properly applicable to the Purchaser in
connection with the purchase of the Strands and other Purchased Assets. AT&T
shall be responsible for all sales, use and other similar Taxes properly
applicable to AT&T in connection with construction of the AT&T System, including
Taxes imposed on AT&T's purchase of Dark Fiber and other materials incorporated
into the AT&T System.

      14.3 From and after the Phase Closing Date with respect to any Fibers
delivered to Purchaser in connection with such closing, Purchaser shall be
responsible for any and all sales, use, income, gross receipts or other Tax
assessed on the basis of revenues received by Purchaser pursuant to its use of
the Purchaser Strands so delivered and the other Purchased Assets.

      14.4 From and after the Phase Closing Date with respect to any Fibers
delivered to Purchaser in connection with such closing, Purchaser shall be
solely responsible for any real or personal property Taxes arising from the use
of the Purchaser Strands so delivered and the other Purchased Assets.

      14.5 To the extent a Party possesses rights that would exempt it from any
taxation, the Parties shall cooperate in good faith so as to allow such Party
the opportunity to benefit from any such exemption from Taxes.

      14.6 Except as set forth in Section 14.2, Purchaser shall be responsible
for all Taxes properly levied or imposed upon the purchaser in connection with
the purchase of the Strands and other Purchased Assets. AT&T shall be
responsible for all Taxes properly levied or imposed upon the seller in
connection with the sale of the Strands and other Purchased Assets.

                                   ARTICLE XV
                                     NOTICE

      15.1 Unless otherwise provided herein, all notices and communications
concerning this Agreement shall be addressed to the other party as follows:

            If to AT&T:       AT&T Corp.
                              ATTENTION: Stephen R. Allen
                              Division Manager-Network Services
                              900 Route 202/206
                              Post Office Box 752
                              Bedminster, New Jersey  07921
                              Telephone No.: 908-234-8760
                              Facsimile No.: 908-234-8445

            with a copy to:   AT&T Corp.
                              ATTENTION: General Attorney-Network Services
                              Room 3244J1
                              295 North Maple Avenue
                              Basking Ridge, New Jersey  07920

                                       21

<Page>

                              Telephone No.: 908-221-7178
                              Facsimile No.: 908-221-7198

                              AT&T Corp.
                              ATTENTION: Jim Bradley
                              900 Route 202-206
                              3C213
                              Bedminster, NJ 07921
                              Telephone No: 908-234-8574
                              Facsimile:908-234-8445
                              E-Mail: jmbradley@att.com

            If to Purchaser:  PF.Net Corp.
                              ATTENTION: Name: Kirby G. Pickle Jr.
                              Title: President & Chief Executive Officer
                              1800 Alexander Bell Drive
                              4th Floor
                              Reston, VA 20191
                              Telephone No.: 703-262-7200
                              Facsimile No.: 703-391-6804

            with a copy to:   PF.Net Corp.
                              ATTENTION:  Phillip Wright
                              Title:  Vice-President Legal
                              500 Kenrick
                              Suite A-5
                              Houston, TX 77060
                              Telephone No.: 281-260-4014
                              Facsimile No.: 703-260-4063

or at such other address as either Party may designate from time to time in
writing to the other Party.

      15.2 Unless otherwise provided herein, notices shall be hand delivered,
sent by registered or certified U.S. mail, postage prepaid, or by commercial
overnight delivery service, or transmitted by facsimile, and shall be deemed
served or delivered to the addressee or its office when received at the address
for notice specified above when hand delivered, upon confirmation of sending
when sent by fax, on the day after being sent when sent by overnight delivery
service, or three (3) days after deposit in the mail when sent by U.S. mail.

      15.3 All invoices concerning payment obligations due to AT&T pursuant to
this Agreement shall be addressed to Purchaser as follows:

            PF.Net Corp.
            ATTENTION: Name: David Taylor
            Title: Vice President & Chief Financial Officer
            1800 Alexander Bell Drive

                                       22

<Page>

            4th Floor
            Reston, VA 20191
            Telephone No.: 703-262-7200
            Facsimile No.: 703-391-6804

      15.4 All questions concerning payment obligations due to Purchaser or AT&T
pursuant to this Agreement shall be addressed to AT&T as follows:

            AT&T Corp.
            ATTENTION: Name: Carol Hawkins
            Title: General Manager AT&T Business Services
            3W 101
            300 Atrium Drive
            Somerset, NJ 08873
            Telephone No.: 732-805-5715
            Facsimile No.: 732-805-6112
            E-Mail : cahawkins@att.com

                                  ARTICLE XVI
                                    DEFAULTS

      16.1 With respect to all payments required to be made by Purchaser
hereunder, including, without limitation, payment of the Purchase Price and all
other amounts payable by Purchaser hereunder, in the event Purchaser shall fail
to make a payment by the date due and payable hereunder, from and after such
date such unpaid amount shall bear interest until paid at a rate equal to the
rate set forth in Article XXIX. In the event any payment of any portion of the
Purchase Price is not paid on the Payment Date (including, without limitation
any Additional Payments with respect to IRU Links) on which it is due (a
"Payment Default") and remains unpaid for a period of thirty (30) days after the
respective Payment Date, and the amount thereof is not in bona fide dispute so
long as any amount due and not in dispute is paid, then at the expiration of
such thirty (30) day period, then AT&T may elect to terminate this Agreement by
giving Purchaser notice of its election to do so, and upon such termination all
rights of Purchaser in (a) all Fibers (other than Phase 1 Fibers in an IRU Link)
as to which a Phase Closing Date shall not have occurred, and (b) subject to the
provisions of Section 17.3 below, all Phase 1 Fibers comprising a Phase included
in an IRU Links as to which all payments due on the Additional Payment Dates
with respect to such Phase shall not have been made, shall terminate.

      16.2 An "Event of Default" shall exist if any of the following shall
occur: (i) the making by Purchaser of a general assignment for the benefit of
its creditors; (ii) the filing by Purchaser of a voluntary petition in
bankruptcy; (iii) the filing by Purchaser of any petition or answer seeking,
consenting to, or acquiescing in reorganization, arrangement, adjustment,
composition, liquidation, dissolution, or similar relief; or (iv) if an
involuntary petition in bankruptcy or other insolvency protection is filed
against Purchaser and the same is not dismissed within such ninety (90) days.

      16.3 Each of the following shall be deemed a default by Purchaser under
this Agreement:

                                       23

<Page>

            (a) Failure by Purchaser to perform or observe any other terms,
      covenant, agreement or condition of this Agreement on the part of
      Purchaser to be performed and such default continues for a period of
      forty-five (45) days after written notice thereof from AT&T; PROVIDED,
      HOWEVER that if such default cannot be cured within such forty-five (45)
      day period, this period will be extended for an additional period (but not
      in excess of one hundred twenty (120) days) if Purchaser commences to cure
      such default within such forty-five (45) day period and proceeds
      diligently thereafter to effect such cure);

            (b) If Purchaser uses the Purchaser Strands in violation of any law
      or any unlawful act or undertaking if any such violation could be
      attributed to AT&T or otherwise result in an adverse effect on AT&T or the
      AT&T System;

            (c) If Purchaser uses any portion of AT&T's System without having
      first been issued a required license therefor if any resulting violation
      or other breach thereof could be attributed to AT&T or otherwise result in
      an adverse effect on AT&T or the AT&T System; or

            (d) If any authorization which lawfully may be required of Purchaser
      by any governmental or private authority, other than Underlying Rights,
      for the Purchaser's Strands within AT&T's System is denied or revoked if
      any resulting violation or other breach thereof could be attributed to
      AT&T or otherwise result in an adverse effect on AT&T or the AT&T System.

      16.4 AT&T shall give prompt written notice to Purchaser of the occurrence
of any default by Purchaser under Section 16.3. If a default by Purchaser (other
than a Payment Default or an Event of Default as set forth in Section 16.2)
shall occur and shall have not have been cured with a period of forty five (45)
days after AT&T shall have given Purchaser written notice of such failure, an
"Event of Default" shall exist; PROVIDED, HOWEVER, that where such failure
cannot reasonably be cured within such forty five (45) day period, this period
will be extended, for an additional period (but not in excess of one hundred
twenty (120) days) if Purchaser commences to cure such default within such
forty-five (45) day period and proceeds diligently thereafter to effect such
cure).

      16.5 The following events or occurrences shall constitute a default by
AT&T under this Agreement:

            (a) Failure by AT&T to perform or observe any other terms, covenant,
      agreement or condition of this Agreement on the part of AT&T to be
      performed and such default continues for a period of forty-five (45) days
      after written notice thereof from Purchaser (provided that if such default
      cannot be cured within such forty-five (45) day period, this period will
      be extended, for an additional period (but not in excess of one hundred
      twenty (120) days) if AT&T commences to cure such default within such
      forty-five (45) day period and proceeds diligently thereafter to effect
      such cure);

                                       24

<Page>

            (b) If AT&T uses the AT&T System in violation of any law or any
      unlawful act or undertaking, if such violation could be attributed to
      Purchaser or otherwise result in an adverse effect on Purchaser or the
      Purchaser Strands.

      16.6 Purchaser shall give prompt written notice to AT&T of the occurrence
of any default by AT&T under this Agreement. If any such default shall occur and
continues for forty-five (45) days after receipt of such notice (provided that
if such default cannot be cured within such forty-five (45) day period, this
period will be extended, for an additional period (but not in excess of one
hundred twenty (120) days) if AT&T continues to cure such default within such
forty-five (45) day period and proceeds diligently thereafter to effect such
cure), an "Event of Default" shall exist.

      16.7 Upon the occurrence of an Event of Default by Purchaser or AT&T,
except as otherwise provided in Section 16.1 (or as otherwise set forth in this
Agreement), the non defaulting Party may (i) take such action as it determines,
in its sole discretion, to be necessary to correct the default and, subject to
Section 12.1, recover from the other Party its reasonable costs incurred in
correcting such default, and (ii) pursue any legal remedies it may have under
applicable law or principles of equity relating to such default, including
specific performance or termination of this Agreement.

                                  ARTICLE XVII
                                   TERMINATION

      17.1 [INTENTIONALLY DELETED]

      17.2 [INTENTIONALLY DELETED]

      17.3 No termination or expiration of this Agreement shall affect the
rights or obligations of any party hereto (i) with respect to any then existing
defaults or the obligation to make any payment due hereunder prior to
termination or (ii) pursuant to Article XI, Article XII, Article XIII or Article
XIV herein, which shall survive the expiration or termination hereof or (iii)
with respect to (A) Fibers other than Phase 1 Fibers in IRU Links (but including
Phase 2 Fibers in IRU Links) as to which the Phase Closing Date shall have
occurred, (B) Phase 1 Fibers included in IRU Links as to which all payments due
with respect to such Fibers on the Additional Payment Dates shall have been
made, and (C) the right of use in Phase 1 Fibers included in IRU Links, for
which all applicable payments theretofore due have been made, for the period of
time from and after the last Payment Date on which payments regarding Fibers in
such IRU Link have been made to the next Additional Payment Date.

      17.4 [INTENTIONALLY DELETED]

                                 ARTICLE XVIII
                                  FORCE MAJEURE

      18.1 Neither Party shall be in default under this Agreement if and to the
extent that any failure or delay in such Party's performance of one or more of
its obligations hereunder is caused by any of the following conditions (and such
Party's performance of such obligation or

                                       25

<Page>

obligations shall be excused and extended for and during the period of any such
delay): act of God; fire; flood; fiber, Cable, or other material failure,
shortage or unavailability or other delay in delivery not resulting from the
responsible party's failure to timely place orders therefor (it being expressly
acknowledged that the Cable that is being acquired for and installed in the AT&T
System and that will include the Subject Strands must include higher Fiber
counts than that necessary solely for the Subject Strands in order to permit
completion of the entire AT&T System); lack of or delay in transportation;
government codes, ordinances, laws, rules, regulations or restrictions
(collectively, "Regulations"); war or civil disorder; strikes or other labor
disputes; failure of a third party to grant or recognize an Underlying Right
during the installation of the AT&T System, or any other cause beyond the
reasonable control of such Party. The Party claiming relief under this Article
XVIII shall notify the other Party in writing of the existence of the event
relied on and the cessation or termination of said event and shall continue to
exercise commercially reasonable efforts to overcome such event of force
majeure. Neither Party's obligations will be excused for more than one hundred
eighty (180) days for any force majeure event(s) on a single Link.

                                  ARTICLE XIX
                               DISPUTE RESOLUTION

      19.1 Except as provided in Section 19.3 concerning Intellectual Property
Issues, any and all controversies or claims of any nature arising out of or
relating to this Agreement or the breach, termination or validity thereof,
whether based on contract, tort, statute, fraud, misrepresentation or any other
legal or equitable theory (the "Claim") shall be resolved solely and exclusively
by arbitration by the CPR Institute for Dispute Resolution ("CPR") in accordance
with the provisions of this paragraph and the CPR Rules for Non-Administered
Arbitration to the extent such rules do not conflict with this paragraph and
Agreement. The Respondent's notice of defense shall be served upon the Claimant
within ten (10) days after the Respondent receives (in the case of an
arbitration commenced against AT&T, notice of arbitration shall not be deemed
received unless it references this Agreement and is sent to AT&T's General
Attorney Network Services, with copy to the persons to whom any notices under
this Agreement must be sent, if any) the notice of arbitration (the date of
receipt of notice of arbitration being "Commencement"). The arbitration shall be
conducted by one (1) arbitrator mutually selected by the Parties from a CPR
Panel. If the Parties cannot mutually agree upon the arbitrator within fifteen
(15) days after Commencement, the Parties shall notify CPR and an arbitrator
knowledgeable in the legal and technical aspects of the Claim shall be appointed
by CPR within twenty-five (25) days of Commencement. The arbitrator shall
strictly limit discovery to the production of documents directly relevant to the
facts alleged in the notices of arbitration and defense and, if depositions are
required, each Party shall be limited to three (3) depositions of no longer than
three (3) hours each. The Parties shall disclose source code if the arbitrator
decides that the award may depend upon the analysis of such source code. If the
arbitrator decides to hold an evidentiary hearing, each party's presentation of
its case, including its direct and rebuttal testimony, shall be limited to three
(3) days. The arbitrator shall issue an order preventing the Parties, CPR and
any other participants to the arbitration from disclosing to any third party any
information obtained via the arbitration, including discovery documents,
evidence, testimony and the award except as may be required by law. All requests
for injunctive relief shall be decided by the arbitrator; provided, however,
that requests for temporary injunctive relief may be submitted to a court of
competent jurisdiction pursuant to Section 21.1 if

                                       26

<Page>

the arbitrator has not yet been appointed. The arbitrator shall have the
authority to modify any injunctive relief granted by such a court.

      19.2 The arbitration award shall: (a) be in writing; (b) state only the
damages and injunctive relief granted, if any; (c) be made final within six (6)
months of Commencement; and (d) be entered by either Party in any court having
competent jurisdiction pursuant to Section 21.1 provided that the Party entering
the award shall request that the court prevent the award from becoming publicly
available except as may be required by law. The arbitrator shall not limit,
expand or otherwise modify the terms of this Agreement and shall not award
punitive or other damages in excess of compensatory damages. The arbitrator
shall orally state the reasoning on which the award rests but shall not state
such reasoning in any writing. Each Party shall bear its own expenses, but those
related to the compensation of the arbitrator shall be borne equally. The
Parties agree that the existence and contents of the entire arbitration,
including the award, shall be deemed a compromise of a dispute under Rule 408 of
the Federal Rules of Evidence, shall not be discoverable in any proceeding,
shall not be admissible in any court (except for the enforcement thereof) or
arbitration and shall not bind or collaterally estop either Party with respect
to any claim or defense made by any third party.

      19.3 If any Claim, or response to any Claim, includes an allegation that
potentially concerns whether any intellectual property rights (for purposes of
this provision, "intellectual property rights" include any rights protectable
under intellectual property law anywhere throughout the world, including rights
protected under patent, copyright, trade secret or trademark law) owned,
controlled or licensable by AT&T are invalid, unenforceable or not infringed or
misappropriated, or are otherwise limited in scope or application, then AT&T
may, in its sole discretion, elect to have such Claim adjudicated before a court
of competent jurisdiction pursuant to Section 21.1 and Sections 19.1, 19.2, and
19.3 shall not be binding on either Party with respect to such Claim in its
entirety or related Claims, including any portions of such Claim which do not
concern intellectual property rights.

                                   ARTICLE XX
                                     WAIVER

      20.1 The failure of either Party to enforce any of the provisions of this
Agreement, or the waiver thereof in any instance, shall not be construed as a
general waiver or relinquishment on its part of any such provision, but the same
shall nevertheless be and remain in full force and effect.

                                  ARTICLE XXI
                          GOVERNING LAW, APPLICABLE LAW

      21.1 This Agreement shall be governed by and construed in accordance with
the domestic laws of the State of New York, without reference to its choice of
law principles. Any litigation based hereon, or arising out of or in connection
with a default by either Party in the performance of its obligations hereunder,
subject to the arbitration provisions contained in Section 19.2 (including,
without limitation, actions seeking to enforce the decisions of arbitrators),
shall be brought and maintained exclusively in the courts of the State of New
York or in the U.S. District Court for the Southern District of New York, and
each Party hereby

                                       27

<Page>

irrevocable submits to the jurisdiction of such courts for the purpose of any
such litigation and irrevocably agrees to be bound by any judgment rendered
thereby in connection with such litigation.

      21.2 The rights and obligations of the Parties set forth herein shall be
subject to provisions of applicable laws, rules and regulations, including
specifically, but without limitation, the provisions of the Hart Scott Rodino
Antitrust Improvements Act of 1976, as amended ("HSR"). To the extent that
filings under HSR are required in connection with the transactions contemplated
hereby, each Party agrees to make, as promptly as possible, any filing which it
is required to make to comply with HSR, and to pay any fees required in
connection with such filing.

                                  ARTICLE XXII
                              RULES OF CONSTRUCTION

      22.1 The captions or headings in this Agreement are strictly for
convenience and shall not be considered in interpreting this Agreement or as
amplifying or limiting any of its content. Words in this Agreement which import
the singular connotation shall be interpreted as plural, and words which import
the plural connotation shall be interpreted as singular, as the identity of the
Parties or objects referred to may require.

      22.2 Unless expressly defined herein, words having well known technical or
trade meanings shall be so construed. All listing of items shall not be taken to
be exclusive, but shall include other items, whether similar or dissimilar to
those listed, as the context reasonably requires.

      22.3 Except as set forth to the contrary herein, any right or remedy of
Purchaser or AT&T shall be cumulative and without prejudice to any other right
or remedy, whether contained herein or not.

      22.4 Nothing in this Agreement (other than Sections 11.1, 11.2 and 27.1)
is intended to provide any legal rights to anyone not an executing party of this
Agreement.

      22.5 All actions, activities, consents, approvals and other undertakings
of the Parties in this Agreement shall be performed in a reasonable and timely
manner, it being expressly acknowledged and understood that time is of the
essence in the performance of obligations required to be performed by a date
expressly specified herein. Except as specifically set forth herein, for the
purpose of this Agreement the accepted standards and practices of performance
within the telecommunications industry in the relevant market shall be the
measure of a Party's performance.

                                 ARTICLE XXIII
                       ASSIGNMENT AND DARK FIBER TRANSFERS

      23.1 Except as provided below, AT&T shall not assign, encumber or
otherwise transfer this Agreement or all or any portion of its rights or
obligations hereunder to any other person or entity without the prior written
consent of Purchaser, which consent will not be unreasonably

                                       28

<Page>

withheld or delayed. Notwithstanding the foregoing, AT&T shall have the right,
without Purchaser's consent, to (i) subcontract (or otherwise cause a third
party to perform) any of its construction or maintenance obligations hereunder
or (ii) assign or otherwise transfer this Agreement in whole or in part (A) to
any parent, subsidiary or affiliate of AT&T, (B) to any person, firm,
corporation or other entity which shall control, be under the control of or be
under common control with AT&T, (C) to any corporation or other entity into
which AT&T may be merged or consolidated or which purchases all or substantially
all of the stock or assets of AT&T, or (D) to any partnership, joint venture or
other business entity of which AT&T or any wholly owned subsidiary of AT&T owns
at least 50 percent of the equity interests thereof and which cannot make major
decisions without the consent of AT&T; PROVIDED that the assignee or transferee
in any such circumstance shall continue to be subject to all of the provisions
of this Agreement, including without limitation, this Section 23.1; and
PROVIDED, FURTHER that promptly following any such assignment or transfer, AT&T
shall give Purchaser written notice identifying the assignee or transferee. In
the event of any permitted partial assignment of any rights hereunder, AT&T
shall remain the sole point of contact with Purchaser. No permitted partial or
complete assignment shall release or discharge AT&T from its duties and
obligations hereunder.

      23.2 For the purposes of this Section 23.2, "Transfer" shall mean any
sale, assignment or other transfer by Purchaser of all or any portion of its
rights or interests in the Purchased Assets; provided, however, that "Transfer"
shall not include any transfer or assignment permitted under Section 23.2(b)
below. The Purchased Assets, which are subject to transfer, are referred to
herein as the "Transfer Assets".

            (a) Except as otherwise expressly provided in this Section 23.2,
      Purchaser shall retain title to all of the Purchaser Strands for the sale
      or leasing of capacity, or otherwise making capacity thereon available, in
      the ordinary course of its business and that of its wholly owned direct or
      indirect subsidiaries until June 30, 2002. After June 30, 2002, Purchaser
      shall have the right (subject to its compliance with its other obligations
      contained herein, including specifically those contained in Section 3.2)
      to sell the Purchaser Strands as Dark Fibers; provided that Purchaser has
      no rights to transfer or sub-let Dark Fiber co-location pursuant to this
      agreement and the POP Co- Location Agreement with respect to any assigns
      or future Dark Fiber Purchase from the Purchaser.

            (b) Notwithstanding the foregoing, and subject to the provisions of
      Section 23.3 (which provision shall be binding upon any permitted assignee
      or transferee hereunder), Purchaser shall have the right at any time,
      without AT&T's consent, (i) to assign or otherwise transfer this Agreement
      in whole or in part (A) to any subsidiary or affiliate of Purchaser or (B)
      to any person, firm, corporation or other entity which shall control, be
      under the control of or be under common control with Purchaser (C) to any
      corporation or other entity into which Purchaser may be merged or
      consolidated or which purchases all or substantially all of the stock or
      assets of Purchaser, or (D) to any partnership, joint venture or other
      business entity of which Purchaser or any wholly owned subsidiary of
      Purchaser owns at least 50 percent of the equity interests thereof and
      which cannot make major decisions without the consent of Purchaser; and
      (ii) to assign or transfer the rights acquired pursuant to this Agreement
      in Links 21, 24, 33.2, 37.1, 49 and/or 54 to any person or entity;
      provided that the assignee or transferee in any such circumstance
      permitted under clause (i) or (ii) above shall continue to be subject to
      all of

                                       29

<Page>

      the provisions of this Agreement, including without limitation, this
      Section 23.1; and provided further that promptly following any such
      assignment or transfer, Purchaser shall give AT&T written notice
      identifying the assignee or transferee. In the event of any permitted
      partial assignment under clause (i) or any assignment permitted under
      clause (ii) of the preceding sentence, Purchaser shall remain the sole
      point of contact with AT&T. No permitted partial or complete assignment
      shall release or discharge Purchaser from its duties and obligations
      hereunder; provided that the assignee or transferee in any such
      circumstance shall continue to be subject to all of the provisions of this
      Agreement, including without limitation this Section 23.2; and provided
      further that promptly following any such assignment or transfer, Purchaser
      shall give AT&T written notice identifying the assignee or transferee. In
      the event of any permitted partial assignment of any rights hereunder,
      Purchaser shall remain the sole Party and point of contact with AT&T
      hereunder. No permitted partial or complete assignment shall release or
      discharge Purchaser from its duties and obligations hereunder.

      23.3 AT&T and Purchaser recognize that AT&T may desire to obtain
tax-deferred exchange treatment pursuant to Section 1031 of the Internal Revenue
Code, as amended, with respect to certain of the Dark Fibers and Associated
Personal Property which are to be sold hereunder and which are used or held for
use by AT&T in its business as of the date hereof (the "Existing Properties"),
and Purchaser agrees to reasonably cooperate as provided herein in obtaining
such treatment (at no cost or expense to Purchaser). Accordingly,
notwithstanding any provision contained in this Agreement to the contrary, AT&T
may, at its sole option, on or prior to any Phase Closing Date for any relevant
Link, appoint a third party (the "Intermediary") as agent for AT&T with respect
to the transfer of the Existing Properties to Purchaser, and assign its rights
under this Agreement (insofar as they relate to the Existing Properties) to such
Intermediary. If AT&T so elects to appoint an Intermediary, AT&T shall notify
Purchaser, in writing, on or prior to the applicable Phase Closing Date with
respect to the relevant Link, and shall provide Purchaser with copies of all
agreements between AT&T and the Intermediary. If AT&T appoints an Intermediary,
AT&T shall transfer the Existing Properties or such portion thereof as
designated by AT&T to the Intermediary, and Purchaser shall pay such portion of
the Phase Purchase Price determined by AT&T to be allocable with respect to the
Existing Properties (as designated by AT&T) to the Intermediary; provided that
AT&T agrees that such transfer shall be expressly subject to this Agreement, and
that AT&T shall remain liable for performance under this Agreement to the same
extent as if it had not appointed an Intermediary; AND FURTHER PROVIDED that
AT&T agrees under terms reasonably satisfactory to Purchaser, to indemnify and
hold harmless (on an after-tax basis) Purchaser from and against any and all
loss, damage, cost or expense suffered, sustained or incurred by Purchaser in
connection with any such cooperation and/or payment to such Intermediary.

      23.4 This Agreement and each of the Parties' respective rights and
obligations under this Agreement, shall be binding upon and shall inure to the
benefit of the Parties and each of their respective permitted successors and
assigns.

                                  ARTICLE XXIV
                 REPRESENTATIONS, WARRANTIES AND ACKNOWLEDGMENTS

      24.1 Each Party represents and warrants that:

                                       30

<Page>

            (a) it has the full right and authority to enter into, execute,
      deliver and perform its obligations under this Agreement;

            (b) this Agreement constitutes a legal, valid and binding obligation
      enforceable against such Party in accordance with its terms, subject to
      bankruptcy, insolvency, creditors' rights and general equitable
      principles; and

            (c) its execution of and performance under this Agreement shall not
      violate any applicable existing regulations, rules, statutes or court
      orders of any local, state or federal government agency, court or body.

      24.2 AT&T represents and warrants that both the Subject Strands and the
portion of the AT&T System in which the same is located, shall be engineered,
constructed and installed in accordance with the specifications set forth in
Exhibits D and E, and that any deviation from such specifications have not and
shall not result in damage to the Subject Strands; provided that Purchaser's
sole rights and remedies with respect to any such damage to the Subject Strands
shall be for AT&T to repair and correct any Material Fiber Deviations from the
standards set forth in Exhibits D and E at AT&T's sole cost and expense. For
purposes hereof, "Material Fiber Deviation" means a deviation, which has or is
reasonably likely to have a material adverse affect on the operation or
performance of the Subject Strands affected thereby. The representations and
warranties set forth in this Section 24.2 shall terminate and be of no further
force and effect as of the date thirty (30) days prior to the expiration of the
"Applicable Period" (as hereinafter defined) except with respect to claims for
breaches of such representation and warranties as to which Purchaser provides
notice to AT&T not less than thirty (30) days prior to the expiration of the
Applicable Period. As used herein, the term "Applicable Period" shall mean (i)
with respect to Material Fiber Deviations relating to the quality or
characteristics of the Subject Strands, the warranty period obtained by AT&T
with respect to such Fiber, and (ii) with respect to any other material
deviations, the warranty period obtained by AT&T from the applicable contractor
performing the services which are allegedly subject to the material deviation;
provided, however, that if such services were performed by AT&T, the Applicable
Period shall be the warranty period obtained by AT&T from the contractor
providing the largest portion of the construction services on the affected Link.
Notwithstanding the foregoing, "Applicable Period" shall be at least equal to
thirty (30) days after the applicable Completion Notice.

      24.3 The Parties acknowledge and agree that on and after the relevant
Fiber Acceptance Date, Purchaser's sole rights and remedies with respect to any
defect in or failure of the Subject Strands to perform in accordance with the
applicable vendor's or manufacturer's specifications and warranties with respect
to the Subject Strands shall be limited to the particular vendor's or
manufacturer's warranty with respect thereto. In the event any maintenance or
repairs to the AT&T System are required as a result of a breach of any warranty
made by any manufacturers, contractors or vendors, unless Purchaser shall elect
to pursue such remedies itself, AT&T shall pursue all remedies against such
manufacturers, contractors or vendors on behalf of Purchaser, and AT&T shall
reimburse Purchaser's costs for any maintenance Purchaser has incurred as a
result of any such breach of warranty to the extent the manufacturer, contractor
or vendor has paid such costs. It is provided, however that if the applicable
cable warranty shall have been voided by the actions of AT&T, AT&T shall be
responsible to repair or replace the

                                       31

<Page>

Subject Strands if the applicable manufacturer would have been required to do so
but for the action of AT&T. If Purchaser shall elect to pursue such remedies
itself, Purchaser must give AT&T notice of such election before commencing such
pursuit. To the extent the pursuit by Purchaser of such remedies results in any
manufacturer, contractor or vendor agreeing to maintain or repair the AT&T
System, such manufacturer, contractor or vendor must obtain AT&T's consent
(which shall not be unreasonably withheld) as to the time and manner of such
maintenance or repair.

      24.4 The Parties represent and warrant to each other that neither of them
has dealt with any broker or agent in connection with the transaction
contemplated by this Agreement, and each Party shall indemnify, defend and hold
harmless the other from and against any commission or fee claimed by any broker
or agent in connection with this Agreement.

      24.5 EXCEPT AS SPECIFICALLY SET FORTH IN THIS AGREEMENT, AT&T MAKES NO
WARRANTIES REGARDING THE SERVICES OR DELIVERABLES PROVIDED UNDER THIS AGREEMENT
AND MAKES NO WARRANTIES EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

                                  ARTICLE XXV
                           ENTIRE AGREEMENT; AMENDMENT

      25.1 This Agreement constitutes the entire and final agreement and
understanding between the Parties with respect to the interrelated subject
matter hereof and supersedes all prior agreements relating to the subject matter
hereof, which are of no further force or effect. The Exhibits referred to herein
are integral parts hereof and are hereby made a part of this Agreement. To the
extent that any of the provisions of any Exhibit hereto are inconsistent with
the express terms of this Agreement, the terms of this Agreement shall prevail.
This Agreement may only be modified or supplemented by an instrument in writing
executed by a duly authorized representative of each Party and delivered to the
Party relying on the writing.

                                  ARTICLE XXVI
                        BRANDING ISSUES; CONFIDENTIALITY

      26.1 Neither Party shall publish or use any advertising, sales promotions,
or other publicity materials that use the other Party's logo, trademarks, or
service marks without prior written approval of the other Party.

      26.2 Each Party shall have the right to review and approve any publicity
material, press releases, or other public statements by the other Party that
refer to such Party or that describe any aspect of this Agreement. Each Party
agrees not to issue any such publicity materials, press releases, or public
statements without the prior written approval of the other Party.

      26.3 Nothing in this Agreement establishes a license for either Party to
use any of the other Party's brands, marks, or logos without prior written
approval of the other Party.

                                       32

<Page>

      26.4 In connection with this Agreement, either Party may furnish to the
other Party certain information that is proprietary to the furnishing Party or
its licensor and that is marked or otherwise specifically identified as
proprietary or confidential ("Confidential Information"). This Confidential
Information may include, among other things, documentation, data, drawings,
specifications, plans, and other technical or business information. For purposes
of this Section 26.4, the Party that discloses Confidential Information is
referred to as the "Disclosing Party", and the Party that receives Information
is referred to as the "Receiving Party".

      26.5 With respect to Confidential Information disclosed under this
Agreement, the Receiving Party and its employees, contractors or consultants
with a need to know shall:

            (a) hold the Confidential Information in confidence, exercising a
      degree of care not less than the care used by the Receiving Party to
      protect its own proprietary or confidential information that it does not
      wish to place in the public domain; provided, that, in no event shall such
      degree of care be less than reasonable;

            (b) restrict disclosure of the Confidential Information solely to
      those of its employees, contractors and consultants who have a need to
      know in connection with the performance under this Agreement, and not
      disclose the Confidential Information to any other person or entity
      without the prior written consent of the Disclosing Party;

            (c) advise those employees, contractors and consultants with a need
      to know of their obligations with respect to the Confidential Information
      and require such employees, contractors and consultants to honor such
      obligations; and

            (d) use the Confidential Information only in connection with the
      Receiving Party's performance under this Agreement, except as the
      Disclosing Party may otherwise agree in writing.

      26.6 Confidential Information shall be deemed the property of the
Disclosing Party. Upon request of the Disclosing Party, the Receiving Party
shall return all Confidential Information (including copies thereof) received in
tangible form, or shall destroy it and provide written certification of
destruction to the Disclosing Party. Such destruction of Confidential
Information shall include without limitation the erasure of any information that
may have been recorded in any computer's memory or hard disk.

      26.7 Notwithstanding the forgoing, the Receiving Party shall not be
subject to any restriction hereunder with respect to any Confidential
Information which:

            (a) was previously known to the Receiving Party free of any
      obligation to keep it confidential; or

            (b) is or becomes publicly available by means other than
      unauthorized disclosure; or

            (c) is developed by or on behalf of the Receiving Party
      independently of any Confidential Information furnished under this
      Agreement; or

                                       33

<Page>

            (d) is received from a third party whose disclosure does not violate
      any confidentiality obligation.

      26.8 The existence of this Agreement, including its terms and conditions,
and all information that may be disclosed to the Receiving Party pertaining to
the identities, locations, and requirements of the Disclosing Party's customers,
is Confidential Information of the Disclosing Party.

      26.9 The Receiving Party agrees to promptly notify the Disclosing Party of
any inquiry or demand made by any governmental agency or authority or any
inquiry or demand made as a result of any administrative or judicial proceeding
wherein an answer to the same would divulge or tend to divulge any Confidential
Information of the Disclosing Party. The Receiving Party shall not disclose any
Confidential Information in response to any such inquiry or demand unless
required to do so by compulsory process of a court, administrative agency or
other governmental authority. Prior to any such disclosure, the Receiving Party
shall allow the Disclosing Party a reasonable opportunity to secure confidential
treatment of any such Confidential Information by such court, administrative
agency or other governmental authority and shall cooperate with the Disclosing
Party in such effort.

      26.10 Each Party agrees that the Disclosing Party would be irreparably
injured by a breach of Section 26.4 by the Receiving Party or its
representatives and that the Disclosing Party may be entitled to equitable
relief, including injunctive relief and specific performance, in the event of
any breach of the provisions of Section 26.4. Such remedies shall not be deemed
to be the exclusive remedies for a breach of Section 26.4, but shall be in
addition to all other remedies available at law or in equity.

      26.11 Notwithstanding the provisions of this ARTICLE XXVI (other than
Section 26.3), both Parties agree that any disclosure (a) that either Party
hereto reasonably concludes, based on the written opinion of securities counsel,
is legally required to be made to any securities or other regulatory authority
or to holders or prospective purchasers of such Party's securities (including,
without limitation, in a 144A offering memorandum or prospectus) or (b) to
lenders or potential lenders bound by confidentiality undertakings consistent
with market practice in the loan markets, shall not constitute a violation of
this ARTICLE XXVI; provided that (i) such disclosure shall not include any
untrue statement of material fact, or omit to state any material fact required
to be stated or necessary to make such disclosure, in light of the
circumstances, not misleading, and (ii) the disclosing Party shall attempt in
good faith to accommodate all requests of the other Party with respect to such
disclosure that are not contrary to the disclosing Party's legal obligations.
The provisions of the preceding sentence are applicable solely to disclosure of
the terms and conditions of this Agreement. AT&T hereby consents to the filing
of this Agreement with the Security and Exchange Commission without the need for
the written opinion of competent securities counsel.

                                 ARTICLE XXVII
                              NO PERSONAL LIABILITY

      27.1 Each action or claim against any Party arising under or relating to
this Agreement shall be made only against such Party as a corporation, and any
liability relating thereto shall be

                                       34

<Page>

enforceable only against the corporate assets of such Party. No Party shall seek
to pierce the corporate veil or otherwise seek to impose any liability relating
to, or arising from, this Agreement against any shareholder, employee, officer
or director of the other Party. Each of such persons is an intended beneficiary
of the mutual promises set forth in this Article and shall be entitled to
enforce the obligations of this Article.

                                 ARTICLE XXVIII
                           RELATIONSHIP OF THE PARTIES

      28.1 The relationship between Purchaser and AT&T shall not be that of
partners, agents, or joint venturers for one another, and nothing contained in
this Agreement shall be deemed to constitute a partnership or agency agreement
between them for any purposes, including, but not limited to federal income tax
purposes nor shall it merge their assets or liabilities, fiscal or otherwise.
Purchaser and AT&T, in performing any of their obligations hereunder, shall be
independent contractors or independent parties and shall discharge their
contractual obligations at their own risk subject, however, to the terms and
conditions hereof.

                                  ARTICLE XXIX
                                  LATE PAYMENTS

      29.1 In the event a Party shall fail to make any payment under this
Agreement when due, such amounts shall accrue interest, from the date such
payment is due until paid, including accrued interest compounded monthly, at an
annual rate equal to the lesser of (i) the sum of (a) the "prime" corporate base
rate of interest publicly announced from time to time by Chase Bank on the date
any such payment is due and (b) one and one-half percent (1.5%), or (ii) the
highest rate of interest permitted to be charged under applicable law.

                                  ARTICLE XXX
                                  SEVERABILITY

      30.1 If any term, covenant or condition contained herein shall, to any
extent, be invalid or unenforceable in any respect under the laws governing this
Agreement, the remainder of this Agreement shall not be affected thereby, and
each term, covenant or condition of this Agreement shall be valid and
enforceable to the fullest extent permitted by law.

                                  ARTICLE XXXI
                                  COUNTERPARTS

      31.1 This Agreement may be executed in one or more counterparts, all of
which taken together shall constitute one and the same instrument.

                                       35

<Page>

      In confirmation of their consent and agreement to the terms and conditions
contained in this Fiber Sale Agreement and intending to be legally bound hereby,
the Parties have executed this Fiber Sale Agreement as of the date first above
written.

                                    AT&T Corp.

                                    By:   /s/ Kathryn Morrissey
                                         -------------------------------
                                    Name: Kathryn Morrissey

                                    Title: Vice President Sales-Service
                                           Provider Markets

                                    Date:  July 26, 2001
                                          -------------------------------

                                    P.F.Net Corp.

                                    By:  /s/ Donald L. Branscome
                                         -------------------------------
                                    Name: Donald L. Branscome.

                                    Title: Senior Vice President

                                    Date:  July 26, 2001
                                          -------------------------------

                                       36<Page>

                                                                    EXHIBIT 10.5

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 1 of 12

      THE SYMBOL '***' IS USED THROUGHOUT THIS EXHIBIT TO INDICATE THAT THE
PORTION HAS BEEN OMITTED AND FILED SEPARATELY WITH THE COMMISSION.

TO:                               FROM:

PF.Net Corp.                      AT&T Corp.
1800 Alexander Bell Drive         1200 Peachtree Street
4th Floor                         Room 09E30
Reston, VA  20191                 Atlanta, GA  30309
Attn:   Donald L. Branscome       Attn: Lynn O. Pardue

General Purchase Agreement Number 4569177 ("Agreement") between AT&T Corp.
("Company") and PF.Net, Corp. ("Supplier") dated October 29,1999 and as modified
by Amendment Nos. 1 and 2, is further modified by Amendment Number 3 as follows:

1.    ARTICLE 3: STATEMENT OF WORK FOR THE SUPPLY OF LINK(S): The following
      language is added to the Agreement as a new Section 3.1.N through 3.1.U:

       3.1.N  The Links referenced in Section 3.1.E. of the Agreement,
       Amendment 2, are modified to reflect the following:

            CHANGE THE LANGUAGE IN THE FIRST LINE:

                  FROM:       Links 37, 43 and 44

                  TO:         Links 37, 38 and 39

      3.1.O For Page 18, Link 20 of Exhibit B of the Agreement, Amendment 2, the
      Builder Substantially Complete Date and Builder Compete Date are modified
      as follows:

            BUILDER SUBSTANTIALLY COMPLETE DATE:

                  FROM:       January 31, 2001

                  TO:         March 31, 2001

            BUILDER COMPLETE DATE:

                  FROM:       July 31, 2001

                  TO:         September 30, 2001

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 2 of 12

      3.1.P WASHINGTON, DC: On Link 38, the Builder is authorized by AT&T to add
      an additional AT&T POP location, hereinafter referred to as the
      "Washington DC-13th Street Addition" at no additional charge to AT&T. AT&T
      further authorizes Builder to add one (1) one and one-half (1 1/2") inch
      Conduit in addition to the three (3) Conduits already agreed upon to be
      installed, totaling four (4) Conduits, to the section of Link 38 between
      the Washington DC-13th Street Addition and the AT&T POP located at 30 East
      Street SW, Washington DC at no additional charge to AT&T. AT&T's credit
      due from Builder for the elimination of AT&T's requirement for land to
      build an Optical Amplifier at the Santa Ana, CA site has been offset fully
      by the Work to be done in this 3.1.P by Builder.

      3.1.Q CHARLOTTE TELSTAR, NC: On Link 37, the Builder is authorized by AT&T
      to delete the AT&T POP location known as Charlotte Telstar. This AT&T
      Charlotte Telstar POP deletion will be at no decrease in cost to AT&T as
      long as the Work outlined in Section 3.1.P above is completed by Builder
      according to the specifications in this Agreement.

      3.1.R LINK 43 AND LINK 44: AT&T and Builder mutually agree to cancel the
      respective obligations of each party for the following Links and as noted
      in Exhibit B:

            LINK 43: Chicago to Elkhart
            LINK 44:  Toledo to Cleveland

      AT&T will pay Builder the amount of forty percent (40%) of Builder's
      actual documented cost and expense which represents payment in full for
      services rendered prior to the date of termination. The parties agree to
      share ownership of the tangible work product developed prior to the date
      of termination and said work product includes but is not limited to the
      following: line list of tracts of land planned to be crossed by routes,
      engineering drawings, planned route maps, permit applications and permits
      granted, engineering notes and contact reports with permitting agencies
      and any other information which was obtained by the Builder and its
      subcontractors in conjunction with the contract to build these Links and
      is useful in proceeding with future construction of these Routes. AT&T
      shall make payment within thirty (30) days of the date of it's receipt of
      Builders invoice with costs documentation together with the tangible work
      product described herein but in no case prior to January 1, 2002.

      3.1.S REVISION OF LINK 12 PRICING:

      (a)   Builder and AT&T agree to modify the pricing for the construction of
            Link 12 as indicated in Exhibit B attached hereto. The pricing
            indicated in Exhibit B shall become effective immediately for all of
            this Link 12; however, AT&T will continue to pay the pre-Amendment
            #3 Exhibit B price through September 30, 2001, at which time the
            parties will calculate the difference in the price paid by AT&T and
            the price that has been in effect since the signing of this
            Amendment #3 and Builder will issue to AT&T a credit in that amount.
            The credit will be due

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 3 of 12

            to AT&T from Builder on or before 11/1/01. The revised pricing per
            mile for Link 12 shall be Thirty Seven Thousand Three Hundred
            Seventy Dollars ($37,370) per mile for the total of Link 12.

      (b)   AT&T authorizes Builder to supply and install three (3) AT&T
            Conduits in the city of Ft. Worth, TX, for one thousand seven
            hundred fifty (1,750) feet to provide a diverse routing for Link 12.
            The cost for these three (3) additional AT&T Conduits in the city of
            Ft. Worth will be at the fixed price of [***] with construction to
            be completed no later than March 31, 2002, or sooner, if practical;
            providing the city of Ft. Worth agrees to issue to Builder the
            necessary construction permits, including the resolution of any
            license issues with AT&T, if required for the construction permits.
            In the event, the required license and construction permits cannot
            be obtained from the city of Ft. Worth for the route mentioned in
            this Section 3.1.S(b), the parties agree to jointly seek a mutually
            agreed upon alternate route and its pricing.

3.1.T: LINK 4 (ORLANDO, FL TO MIAMI, FL) AND LINK 6 (ELLISVILLE, FL TO ORLANDO,
       FL):

      (a)   For Link 4, the Builder Substantially Complete Date and Builder
            Complete Date shall be modified as follows. It is acknowledged by
            the parties that the Builder Substantially Complete and Builder
            Complete Date for Link 6 remains unchanged.

                  BUILDER SUBSTANTIALLY COMPLETE DATE FOR LINK 4:

                  FROM:       June 30, 2002

                  TO:         September 30, 2002

                  BUILDER COMPLETE DATE FOR LINK 4:

                  FROM:       December 31, 2002

                  TO:         March 31, 2003

      (b)   The parties acknowledge that the construction of Links 4 and 6 are
            dependent upon an agreement with the Florida Turnpike ("FL TPK") to
            grant to AT&T adequate land rights for the construction of Links 4
            and 6 only. To date, AT&T and the FL TPK have reached a verbal
            agreement and are currently negotiating a contract with the FL TPK.
            The proposed contract will require that the FL TPK will grant
            adequate land rights for Links 4 and 6, and AT&T will be required to
            provide facilities as set forth in Exhibit B, Links 4A and 6A
            attached hereto. The Builder has agreed to construct these
            additional facilities provided by AT&T for the FL TPK at the prices,
            terms and conditions as set forth in this Amendment and Exhibit B.
            The parties acknowledge that as the contract with the FL TPK has not
            yet been finalized, AT&T and Builder agree to negotiate in good
            faith any required adjustments to the price, terms and conditions
            based

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 4 of 12

            on the final scope of work using the unit prices listed in "Table:
            Link 4A and 6A Modifications" below. Exhibit B, Links 4A and Link 6A
            contain a reasonable effort between the parties to reach an estimate
            of the work associated with the FL TPK as it is currently known to
            date.

      (c)   For Link 4 from Ft. Pierce to Miami, FL, AT&T will provide to the
            Builder fiber optic cable to be installed in an existing AT&T spare
            conduit located on the FL TPK between Ft. Pierce and the
            intersection with the Route 820 in West Hollywood, FL and on public
            ROW or AT&T ROW from the Route 820 location to AT&T's designated
            Miami POP as set forth in Exhibit B. Builder will verify the
            integrity for use of the existing Conduit, make repairs if required
            according to Article 3.1.T(h), and install the fiber optical cable
            for a cost of [***] per mile. If manholes, hand holes, and/or
            marking is required, pricing for these items will be pursuant to
            the Table set forth below. AT&T will provide to Builder an IRU for
            24 fibers in this section from Ft Pierce to Miami and Builder will
            provide to AT&T an IRU for 12 fibers in the section from Dallas to
            Tulsa currently under construction by Builder.

      (d)   If AT&T and the FL TPK fail to enter into a contract for the
            required land rights to construct Link 4 and/or Link 6 as set forth
            in Section 3.1.T(b) above by October 30, 2001, then one of the
            following two options will commence between the parties: (1) the
            parties may agree to negotiate a new schedule, prices, terms and
            conditions for the Link(s), 4 and/or 6, that was not covered by a
            contract with the FL TPK or (2) either party may terminate the
            respective obligations on the Link(s) not contracted with the FL
            TPK, and AT&T will pay Builder for Work completed on the terminated
            Link(s) up to the date of termination.

      (e)   LINKS 4A AND 6A FL TPK: The "Table: Link 4A and 6A Modifications"
            below itemizes the mutually agreed upon modifications to the prices,
            terms and conditions as further set forth in Exhibit B that will be
            in effect for Links 4 and/or 6 upon the completion of a contract
            between AT&T and FL TPK.

TABLE:  LINK 4A AND 6A MODIFICATIONS

<Table>
<Caption>

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

                SCOPE OF AMENDED WORK ASSOCIATED WITH AT&T AND FLORIDA TURNPIKE ROW AGREEMENT
---------------------------------------------------------------------------------------------------------------
                              LINK 6A: WILDWOOD TO WINDERMERE - FLORIDA TURNPIKE
---------------------------------------------------------------------------------------------------------------
                                                UNIT PRICE     QUANTITIES       PRICE ($)      LOCATION
                                                ($)
---------------------------------------------------------------------------------------------------------------
<S>                                                <C>              <C>         <C>            <C>
Coincident Placement of Second Cable
(provided by AT&T) in existing spare conduit                                                   Wildwood to
(in miles)                                          [***]            38          [***]         Windermere
---------------------------------------------------------------------------------------------------------------
Install Manholes for FTA at cable splice                                                       Wildwood to
points (per splice point)                           [***]            12          [***]         Windermere
---------------------------------------------------------------------------------------------------------------
Install Cable Location Markers for FTA @ 10                                                    Wildwood to
markers per mile (per mile)                         [***]            38          [***]         Windermere
---------------------------------------------------------------------------------------------------------------
TOTAL                                                                            [***]
---------------------------------------------------------------------------------------------------------------
</Table>

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 5 of 12

<Table>
<Caption>

---------------------------------------------------------------------------------------------------------------
                             LINK 4A: WINDERMERE TO FT. PIERCE - FLORIDA TURNPIKE
---------------------------------------------------------------------------------------------------------------
                                                  UNIT PRICE
                                                  ($)          QUANTITIES       PRICE ($)         LOCATION
---------------------------------------------------------------------------------------------------------------
<S>                                                <C>             <C>         <C>             <C>
Engineer Furnish & Install 2 Conduits for                                                      Windermere to
the exclusive use of the Florida Turnpike          [***]           115          [***]          Fort Pierce
---------------------------------------------------------------------------------------------------------------
Install a separate 24 fiber cable in 1 of
the two conduits provided to the Florida                                                       Windermere to
Turnpike for their exclusive use                   [***]           115          [***]          Fort Pierce
---------------------------------------------------------------------------------------------------------------
Engineer Furnish & Install Handhole boxes          [***]           115          [***]          Windermere to
                                                                                               Fort Pierce
---------------------------------------------------------------------------------------------------------------
Furnish and Install Cable location markers @                                                   Windermere to
10 markers per mile                                [***]           115          [***]          Fort Pierce
---------------------------------------------------------------------------------------------------------------
TOTAL                                                                           [***]
---------------------------------------------------------------------------------------------------------------
</Table>

      (f)   FOR LINK 4A--FL TPK: Builder agrees to install one (1) additional
            Conduit for a total of three (3) Conduits to be installed for AT&T
            on Link 4 between Windermere, FL and Ft. Pierce, FL at a cost of
            [***] per mile. In addition, Builder agrees to replace approximately
            one and two tenths (1.2) miles of missing spare Conduit at a fixed
            cost of [***] for the Work.

      (g)   PRICE PER MILE FOR LINKS 4 AND 6: Upon execution of an agreement
            between AT&T and the FL TKP, the prices in Exhibit B, Links 4 and 6
            shall be modified to be at a cost of Thirty Five Thousand Fifty
            Dollars ($35,050) per mile. The Work by Builder as set forth in
            this Article 3.1.T and the Table above are included in the new price
            of Thirty Five Thousand Fifty Dollars ($35,050) per mile.

      (h)   Regarding the Work that Builder will provide in accordance with this
            Agreement on existing AT&T Conduits, it is assumed by both parties
            that the Conduit provided by AT&T is whole and usable for the
            intended purpose of installing fiber optic cable. If during the
            construction, it is discovered by Builder that the AT&T existing
            Conduit is in need of repair, Builder shall proceed with such
            repairs at Builder's cost plus fifteen percent (15%). Builder will
            maintain such records and make such records available upon AT&T's
            request to substantiate the costs and repairs.

3.1.U LINK 37 (ATLANTA, GA TO GREENSBORO, NC):

      (a)   For the section of the Link between Charlotte, NC and Greensboro,
            NC, the parties have agreed to cancel construction as of July 1,
            2001. AT&T will pay Builder the amount of forty percent (40%)
            Builder's actual documented cost and expense which represents
            payment in full for services rendered prior to the date of
            termination. The parties agree to share ownership of the tangible
            work

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 6 of 12

            product developed prior to the date of termination and said work
            product includes but not limited to the following: line list of
            tracts of land planned to be crossed by routes, engineering
            drawings, planned route maps, permit applications and permits
            granted, engineering notes and contact reports with permitting
            agencies and any other information which was obtained by the Builder
            and its subcontractors in conjunction with the contract to build
            these Links and is useful in proceeding with future construction of
            these Routes. AT&T shall make payment within thirty (30) days of the
            date of its receipt of Builder's invoice with costs documentation
            together with the tangible work product described herein but in no
            case prior to January 1, 2002.

      (b)   The Builder shall place The Cable in a separate existing AT&T spare
            Conduit along the Charlotte to Greensboro section of Link 37.

      (c)   The Builder is granted the right by AT&T to construct up to three
            (3) additional Builder's Conduits contained in Link 37 between
            Charlotte to Greensboro as set forth in Exhibit B, and not included
            in the installation of Conduits prior to July 1, 2001. The Builder's
            rights to use the AT&T ROW shall be as provided as a license in the
            format of Exhibit K of the Agreement. During the term of the
            Agreement, if Builder chooses to proceed with the construction as
            set forth in this paragraph (c), and upon AT&T's written notice to
            Builder within sixty (60) days of notice of such Builder
            construction, then AT&T shall have the right to have Builder install
            one or more Conduits on this portion of Link 37 for AT&T's exclusive
            use at a price equal to the fraction of the Builder's total
            reasonable costs which are equal to the fraction of AT&T Conduits to
            the total number of Conduits to be installed by Builder.

2.    Article 3.6 (Regeneration Buildings, OP/AMP Space and Sites) of the
      Agreement is amended to add the following 3.6.A through 3.6.O for only
      those sites identified in "Exhibit 3B: Links and Optical Amplifier
      Locations". Section 3.6.A of this Amendment provides for construction
      services to be provided by Builder to AT&T. The Builder will design,
      construct and install OA buildings that will be approximately twelve feet
      (12') by thirty feet (30') outer dimensions with a total of three hundred
      square feet (300 sq. ft.) of floor space as specified in Exhibit 3A of
      this Amendment. These services are separate and distinct from the sharing
      of and reimbursement of costs described in the remainder of this
      Amendment.

      3.6.A SUPPLY OF OA BUILDINGS: Builder agrees to supply to AT&T new Optical
      Amplifier ("OA") buildings (the "Supplied Services") at the Builder sites
      identified in "Exhibit 3B: Links and Optical Amplifier Locations" (the
      "Shared Sites"). It is contemplated that the new AT&T OA buildings will
      share the slab on which the adjacent Builder buildings are or may be
      located. The Supplied Services to be supplied, in addition to the other
      elements described in Article 3.6.A through 3.6.O, includes but is not
      limited to the following:

            (i)   Planning, engineering, construction and placement of the OA
                  building specified in Exhibit 3A of this Amendment;

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 7 of 12

            (ii)  Supervision and inspection of the pre-fabricated buildings
                  during fabrication and installation of the OA buildings;

            (iii) Assurance that the pre-fabricated OA building supplied by
                  Builder will be in accordance with the drawings and
                  specifications as set forth in Exhibit 3A of this Amendment;

            (iv)  Arrangement and installation of cable conduit for connection
                  to the OA buildings;

            (v)   Necessary engineering and construction services for the
                  purpose of power and communication cables entering and passing
                  through Builder's main building to the AT&T building;

            (vi)  Support the installation of AT&T's cable locating devices and
                  isolation closure in the Builder main OA building and
                  connections to the appropriate equipment in the AT&T building;

      In return for these Supplied Services, AT&T will pay the Builder [***]
      for each OA site constructed by the Builder. All Builder invoices are due
      within thirty (30) days of construction completion and site acceptance by
      AT&T but in no event prior to January 1, 2002.

      Upon mutual agreement by AT&T and Builder, this Section 3.6A may be
      superceded by a separate Construction Services Agreement between the
      Builder and AT&T for the construction of OA sites which would include
      terms substantially similar to the terms described in this amended Section
      3.6.A.

      3.6 B OPTICAL AMPLIFIER SITES: Builder will convey to AT&T adequate land
      rights and space at the Shared Sites for the use and occupation of the OA
      buildings. In addition, Builder will obtain all necessary land use and
      construction permits for the installation of the OA buildings. The nature
      of the rights conveyed to AT&T for the use of the land will be, dependant
      on the nature of Builder's interest in the underlying real estate, either
      fee simple ownership, partial assignment of easement, sub-lease, license
      or such other right of use as permitted by the nature of Builder's
      underlying rights. The land for the OA sites (the OA Land Sites") will be
      provided by Builder so that AT&T will have the right of use (regardless of
      the nature of AT&T's interest in the land) for a period of time no less
      than a period of time equal to Builder's use of the adjacent property but
      no less than forty (40) years from the date of the Agreement. The OA Land
      Sites will be free of restrictive easements or other legal restrictions
      with respect to use so that each party's portion of the OA site can be
      configured in such a way so as to permit the parties the rights to erect
      the parties' building(s) with parking, access and landscaping necessary to
      accommodate each party's respective needs. In the event Builder is unable
      to obtain a permit, license, grant or other right of use from any
      governmental entity or agencies for renewable terms for a minimum of forty
      (40) years, then Builder will obtain the maximum term available by law or
      regulation. In addition to the respective rights and obligations of AT&T
      and Builder that are expressly set forth in

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 8 of 12

      this Amendment Number 3, "Exhibit P: General Terms and Conditions
      Associated with Land Rights of OA Buildings and Services Contract" of this
      Amendment and attached hereto sets forth additional rights and obligations
      of AT&T and Builder, respectively, with respect to the OA land rights and
      will be included in the documents of conveyance from Builder to AT&T to
      the extent necessary. AT&T and Builder agree that if modifications to
      Exhibit P are required this will be by mutual agreement of the parties.

      3.6.C ELECTRICAL POWER FOR OA SITES: After expiration of the three (3)
      year period in which items (i) through (v) of Section 3.6.O are provided
      by Builder at the fixed unit price, Builder will charge AT&T negotiated
      rates for electrical power and building services. AT&T will have the
      option at any time during the term of this Agreement to provide its own
      electrical power upon giving ninety (90) days written notice to Builder of
      AT&T's intention to provide its own power.

      3.6.D EXPANSION OF OA SITE FOR AT&T: To the extent the individual OA site
      layouts permit Builder to reasonably do so in accordance with Exhibit 3B,
      Builder will reserve for AT&T sufficient space and appropriate land
      right(s) for nine hundred square feet (900 sq. ft.) which will consist of
      three (3) additional three hundred square feet (300 sq. ft.) OA buildings
      on Builder's slab for future expansion. Such space reservation will be
      subject to the following condition. After all spaces other than the slab
      spaces reserved for AT&T are used by Builder or sold to third parties;
      Builder may market for sale or use for its own purposes the spaces
      reserved for AT&T only after first providing AT&T the opportunity to
      purchase the space(s) and/or land right(s) for the slab space from
      Builder. Builder shall supply upon request from AT&T additional OA
      buildings conforming to Specifications in Exhibit 3A, within ninety (90)
      days or another time frame mutually agreed upon between the parties at a
      price not to exceed [***] per square foot for a period of three (3) years
      and [***] per square foot for two (2) additional years. AT&T is herewith
      granted the right to purchase and install their own building compatible
      with the adjacent buildings and substantially conforming to the
      specification of Exhibit 3A should AT&T decide to do so.

      3.6.E The terms for the provision of the OA building and the slab space at
      each specified OA site are as follows:

            (i)   AT&T will own the three hundred square foot (300 sq. ft.) OA
                  building, but the land upon which it is constructed is
                  provided by Builder to AT&T through appropriate land rights as
                  set forth in Article 3.6.B of this Amendment to allow for the
                  continuous use, occupation and quiet enjoyment for a term of
                  no less than forty (40) years unless Builder's underlying land
                  rights can only be for a lesser term then Builder shall
                  provide a term for the maximum period of time permitted by
                  such rights.

            (ii)  AT&T will provide appropriate rights to Builder through the
                  AT&T OA building for all cable access through to the adjacent
                  buildings;

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 9 of 12

            (iii) AT&T and AT&T co-location customers will have unrestricted
                  rights of access and egress to its respective three hundred
                  square foot (300 sq. ft.) OA building as well as non-exclusive
                  rights of access to the OA site(s) by way of the access road
                  and pedestrian pathways.

      3.6.F AT&T's Conduits and The Cable will be brought into Builder's main OA
      building at each site. The Cable will be brought into the Optical Service
      Entry Panel ("OSEP") provided by Builder in Builder's main OA building.
      AT&T's Fibers in the outside cable will be spliced to the AT&T Fibers in
      the inside cable (going to the AT&T LGX via the inter-building fiber
      conduit ladder rack) from the OSEP. Builder will provide appropriate
      rights to AT&T for the purpose of installing and maintaining all cables
      (power and communications) which enter Builder's main building and
      pass-through the Builder main building to connect AT&T and its customers
      in the AT&T OA building. Adjacent to the OSEP will be adequate space to
      mount an isolation closure. The office ground will be extended to this
      location to tie into the isolation closure. Additionally, there will be
      adequate space provided by Builder for the mounting of relays provided by
      AT&T for the LMS cable locating system.

      3.6.G In the case of a commercial AC power failure, Builder shall notify
      the AT&T NOC that the commercial AC power has failed, and the status of
      the standby generator and the dispatch of personnel to the appropriate OA
      site. The status of the standby generator's fuel level and estimated
      balance of the run time shall also be communicated to the AT&T NOC. The
      Builder maintenance force shall contact the AT&T NOC to notify the AT&T
      NOC of any alarm indications that may affect AT&T. In the case of a
      failure of the standby generator to automatically start upon the loss of
      commercial AC, Builder shall be responsible for dispatching its
      maintenance personnel to the site to manually start the standby generator
      before the battery reserve is exhausted.

      3.6.H Builder will provide additional DC power, from one hundred eighty
      (180) Amps up to three hundred sixty (360) Amps no later than six (6)
      months from receipt of AT&T's written request for additional power
      conditioned upon the parties reaching mutually acceptable terms and
      conditions.

      3.6.I AT&T will confirm its requirement for power fusing in ten (10) Amp
      increments at acceptance of the OA building or AT&T will provide the
      Builder a minimum of sixty (60) days written notice prior to provision of
      such fusing unless the parties mutually agree upon a different notice
      period.

      3.6.J For an additional three (3) year period after the initial three (3)
      year period from acceptance by AT&T, AT&T will pay and Builder agrees to
      provide increments of ten (10) Amp fuse power at the rate of [***]
      per month per ten (10) Amps. After the six (6) year period, Builder and
      AT&T will mutually agree upon the ten (10) Amp fuse power incremental
      rate based on the average market price charged by other telecom
      co-location providers.

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 10 of 12

      3.6.K If at any time AT&T decides to relocate from the OA building(s)
      provided by the Builder, Builder shall assist AT&T at no cost to Builder
      with planned cable intrusions necessary to extend the AT&T fibers from the
      initial location supplied by Builder to a location on the an OA site owned
      by AT&T.

      3.6.L For those OA sites on the Links identified in Exhibit 3B, Builder
      shall be relieved of its obligation to provide a temporary road, clearing
      and permitting for that portion of the Sites to be conveyed to AT&T. It
      does not relieve Builder of its requirements to provide adequate access
      and egress as set forth in this Article 3.6.

      3.6.M Builder will obtain the right and assign the OA building warranty
      from Rohn to AT&T or in the event, if Builder is unable to assign the
      warranty an acceptable alternative to AT&T will be provided.

      3.6.N Builder will be prepared to provide additional OA buildings to AT&T
      up to ninety (90) day written notice. In the event there are circumstances
      that will restrict Builder's ability to provide such OA buildings, the
      parties will discuss alternate solutions to the mutual agreement of the
      parties. The price for each additional OA building beyond the number set
      forth in Exhibit 3B shall be mutually agreed upon between the parties at
      the time of the request by AT&T for additional OA buildings, however, the
      price for the OA building shall not exceed [***] per square foot including
      installation and associated Work for a period of three (3) years from the
      date of this Amendment and for an additional two (2) years thereafter, the
      price shall not exceed [***] per square foot including installation and
      associated Work. In the event the parties cannot agree upon pricing for
      additional OA buildings, AT&T has the right to acquire and install its own
      OA buildings, providing such buildings substantially equal and of the same
      design as the original OA buildings provided by the Builder.

      3.6.O In consideration of 3.6.B through 3.6.N, Builder will provide the
      following:

            (i)   For three (3) years from acceptance date, -48V DC power at no
                  additional charge to AT&T; AT&T may at its sole decision
                  utilize the Builder provided DC power or provide its own DC
                  power at it's own expense.

            (ii)  For three (3) years from acceptance date, up to one hundred
                  eighty (180) Amps continuous drain at no additional charge to
                  AT&T; provided, however, that should the total demand for
                  Amps, including demands made by AT&T, Builder and third
                  parties, exceed three hundred (300) Amps, AT&T will either
                  share in the cost, on mutually acceptable terms, to upgrade
                  Builder's power system or AT&T will provide its own power.

            (iii) For three (3) years from acceptance date, full building
                  services, including building alarm monitoring at no additional
                  charge to AT&T.

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 11 of 12

            (iv)   Acquisition of land for the location of the OA buildings;
                   and

             (v)   Acquisition of all land use and construction permissions to
                   install the building.

3.    MODIFICATIONS TO EXHIBITS:

      A.    Exhibit B is deleted in its entirety and replaced with the modified
            Exhibit B attached hereto.

      B.    Exhibit 3A and 3B are hereby added to the Agreement and attached
            hereto.

      C.    Exhibit O: Exhibit O is deleted in its entirety and replaced with
            the modified Exhibit O attached hereto.

      D.    Exhibit P: General Terms and Conditions Associated with Land Rights
            of OA Buildings and Services Contract is hereby added to the
            Agreement and attached hereto.

             THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK

<Page>

                                                           Agreement No. 4569177
                                                                 Amendment No. 3
                                                                   Page 12 of 12

This Amendment No. 3 is effective as of the execution of this Amendment by both
parties and shall be incorporated in and shall constitute a part of the
Agreement as if fully set forth therein. EXCEPT AS AMENDED HEREIN, ALL TERMS AND
CONDITIONS OF THE AGREEMENT REMAIN UNCHANGED.

APPROVAL:

ACKNOWLEDGED AND AGREED TO BY:

PF.NET CORP.                           AT&T CORP.

BY       /s/ Donald L. Branscome       BY      /s/ Diana L. Jones
         ----------------------------          ---------------------------------
         (signature)                           (signature)

NAME     DONALD L. BRANSCOME           NAME    DIANA L. JONES

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

TITLE    SENIOR VICE PRESIDENT -       TITLE   GROUP PROCUREMENT DIRECTOR,
         BUSINESS DEVELOPMENT                  AT&T SUPPLIER MANAGEMENT
         ----------------------------          ---------------------------------

DATE      July 27, 2001                DATE     July 25, 2001
         ----------------------------          ---------------------------------
         (typed or printed)                    (typed or printed)

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