<PAGE>


                                                                  EXECUTION COPY


                               CAPACITY AGREEMENT

                                     BETWEEN

                         GLOBAL CROSSING BANDWIDTH, INC.

                                       AND

                         JATO COMMUNICATIONS CORPORATION







                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

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                                TABLE OF CONTENTS

<TABLE>
<CAPTION>

SECTION
-------
<S>      <C>
         Definitions
1.       Services; Circuit Term; Circuit Availability Date
2.       Term of the Agreement
3.       Billing and Payment; Minimum Commitments
4.       Billing Disputes
5.       Termination Rights
6.       Warranties and Limitation Of Liability
7.       Indemnification
8.       Representation
9.       Force Majeure
10.      Waivers
11.      Assignment
12.      Confidentiality
13.      Integration
14.      Governing Law
15.      Notices
16.      Compliance with Laws
17.      Survival of Provisions
18.      Unenforceable Provisions
19.      Cumulative Rights and Remedies
20.      Amendments
21.      Non-Solicitation
22.      Authority
23.      Tariffs
</TABLE>

EXHIBITS

Exhibit A     Private Line Rates and Charges
Exhibit B     National Fiber Network POP Location (By Site)
Exhibit C     CarrierConnect-SM- Dedicated Internet Access Services
Exhibit D     CarrierConnect-SM- IP Plus Options and Associated Charges

Schedule I           Ramp Revenue Schedule

Attachment A          Service Order #1


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                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>


                               CAPACITY AGREEMENT

This Capacity Agreement ("AGREEMENT") is entered into between the provider of
service, Global Crossing Bandwidth, Inc. on behalf of itself and its Affiliates
(as such term is defined herein) that may provide a portion of the services
hereunder ("GLOBAL CROSSING"), a California corporation located at 90 Castilian
Drive, Goleta, CA 93117 and Jato Communications Corporation ("Jato" or
"PURCHASER"), a Delaware corporation with its principal place of business
located at 1099 18th Street, Suite 2200 Denver, Colorado 80202 (hereinafter,
Global Crossing and Jato may be referred to in the aggregate as "PARTIES", and
each singularly as a "PARTY".) Upon full execution, this Agreement supercedes
any and all existing Agreements/Addenda between the parties.

                                     PURPOSE

Jato is an Internet Service Provider (ISP) that desires to purchase dedicated
circuit capacity from Global Crossing for use in providing Internet access and
related services to its customers. For valuable consideration, receipt of which
is hereby acknowledged, the Parties hereto agree as follows.

     DEFINITIONS (not otherwise defined in the body of this Agreement or an
attachment).

     A.   "AFFILIATE" means any entity directly or indirectly controlling,
          controlled by or under common control with a Party.

     B.   "BILLING CYCLE" is the Global Crossing billing cycle to which Jato's
          account hereunder is assigned by Global Crossing (a full billing cycle
          approximates 30 days).

     C.   "BUSINESS DAY" is Monday through Friday, 8:00 am to 5:00 PM EST,
          excluding nationally recognized holidays. Unless otherwise stated,
          "DAYS" refers to calendar days.

     D.   "DELINQUENT" (whether capitalized or not) means any invoiced amounts
          not properly disputed under Section 4 of this Agreement and remaining
          unpaid the due date of the invoice.

1.   SERVICES; CIRCUIT TERM; CIRCUIT AVAILABILITY DATE:

     1.1  Global Crossing shall, in accordance with the terms of this Agreement,
          provide Jato with DS-1, DS-3, OC-3 and OC-12 circuit capacity for
          point-to-point private line services and for dedicated Internet access
          services as the same may be ordered by Jato and the order accepted by
          Global Crossing hereunder from time to time. It is understood the
          parties may negotiate for future services that are not currently
          defined in this Agreement. All such circuit capacity is collectively
          referred to as the "SERVICES".

     1.2  Unless one Party provides the other with at least 90 days prior
          written notice of its intent not to renew a circuit after the
          circuit's minimum commitment period expires, then, unless the Parties
          agree otherwise in writing, a circuit shall automatically renew on a
          month-to-month basis at Global Crossing's then-current rates and
          charges for that circuit type.


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                                          Under 17 C.F.R. Sections 200.80(b)(4),
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     1.3  Upon receipt of a complete and accurate service order for a circuit,
          Global Crossing shall notify Jato of its target date for the delivery
          of each circuit (the "ESTIMATED AVAILABILITY DATE"). Any Estimated
          Availability Date given by Global Crossing to Jato shall be subject to
          Global Crossing's then-current standard and expedited interval
          guidelines. Global Crossing shall use reasonable efforts to install
          each circuit on or before the Estimated Availability Date, but the
          inability of Global Crossing to deliver a circuit by such date, or
          within the interval guidelines, shall not be deemed a breach of this
          Agreement by Global Crossing. If Global Crossing fails to make any
          circuit available within 90 days after Global Crossing's confirmed
          delivery date of the service ordered, Jato's sole remedy shall be to
          cancel the service order which pertains to such circuit upon ten days
          prior written notice to Global Crossing. Notwithstanding the
          foregoing, Jato shall also have a remedy wherein any circuit confirmed
          by Global Crossing and subsequently not supplied due to Global
          Crossing' s inability to deliver will count toward a reduction in the
          Quarterly Minimum Charge (defined at Section 3.7). The reduction in
          the Quarterly Minimum Charge shall be calculated by the specific
          monthly value of the specific circuits that Global Crossing is unable
          to provide under the above terms and conditions, multiplied by a
          maximum of six months. Such reduction shall be accounted for in month
          72 of the term hereof.

     1.4  At each end of the city pairs on which Jato orders circuits, as well
          as within the Global Crossing IP POP to which Jato orders circuits,
          Global Crossing shall provide appropriate equipment in its SONET/IP
          POP locations necessary to connect the circuits to Jato's
          Interconnection Facilities. If Jato desires to install its own
          equipment in one or more SONET/IP POP, and Global Crossing , in its
          sole discretion, agrees to such installation, the Parties shall
          execute a collocation agreement acceptable to both Parties. Jato
          agrees that its Interconnection Facilities shall connect to the
          circuits provided by Global Crossing hereunder at the network
          interface points located in the Global Crossing SONET/IP POPs. As used
          herein, the term "INTERCONNECTION FACILITIES" shall mean transmission
          capacity provided by Jato or its third party supplier to extend the
          circuits provided by Global Crossing from a SONET/IP POP to any other
          location (e.g., a local access telephone service provided by a local
          telephone company).

     1.5  For DS-3 and lesser capacity circuits, Global Crossing shall use
          reasonable efforts to order Interconnection Facilities on behalf of
          Jato from Jato's designated supplier at a cost agreed to by Jato in
          writing, provided that Jato furnishes Global Crossing with an
          acceptable letter of agency. Jato shall be billed directly by the
          supplier of such Interconnection Facilities, and shall defend and
          indemnify Global Crossing from any loss or liability incurred by
          Global Crossing as a result of Global Crossing's ordering
          Interconnection Facilities from any third party on Jato's behalf. Jato
          may, at its election, but subject to Global Crossing's prior written
          approval, order its own Interconnection Facilities. If any party other
          than Global Crossing provides Interconnection Facilities, then
          unavailability, incompatibility, delay in installation, or other
          impairment of Interconnection Facilities shall not excuse Jato's
          obligation to pay Global Crossing all rates or charges applicable to
          the circuits, whether or not such circuits are useable by Jato unless
          such unavailability, incompatibility, delay in installation, or other
          impairment of Interconnection Facilities is caused by Global Crossing.
          When such circuit becomes available, billing will recommence
          concurrent with activation. Global Crossing will not order
          Interconnection Facilities on behalf of Jato for OC-N circuits.


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                                          Under 17 C.F.R. Sections 200.80(b)(4),
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2.   TERM OF THE AGREEMENT:

     This Agreement is binding on the Parties upon the date of execution by
     Global Crossing ("EFFECTIVE DATE") and, subject to the early termination
     provisions of this Agreement, shall continue in effect for a period of
     seventy-two (72) months ("INITIAL TERM"). If a circuit remains installed
     beyond the Initial Term of this Agreement, then this Agreement shall remain
     in effect as long as a circuit is installed hereunder.

3.   BILLING AND PAYMENT; MINIMUM COMMITMENTS:

     3.1  Subject to all the terms and conditions of this Agreement, Jato shall
          pay Global Crossing for the Services at the rates and charges set out
          in the Exhibits or as the Parties may otherwise agree in writing. Jato
          will be responsible for applicable taxes and governmental assessments
          with respect to its use of the Services. If Jato is required to
          provide security hereunder, then Global Crossing is not obligated to
          accept orders, or provide or continue to provide any Services or
          circuits, until the required security is received by Global Crossing.
          If Jato is an existing customer of Global Crossing, the rates and
          charges set forth herein shall be effective with Jato's first full
          Billing Cycle following the later of the Effective Date of this
          Agreement or the date Global Crossing receives any security required
          hereunder. Billing for a circuit shall commence upon the earlier to
          occur of (i) 30 days following the date Global Crossing notifies Jato,
          in writing or via electronic transmission, that the ordered circuit
          capacity is available from Global Crossing (regardless of whether or
          not Jato's Interconnection Facilities are installed and operational),
          or (ii) the date the ordered circuit capacity is first utilized by
          Jato (the "SERVICE DATE").

     3.2  Jato shall provide Global Crossing with a letter of credit in the
          amount of $[* * *] as security with respect to its performance under
          this Agreement, which letter of credit shall be provided to the
          Controller of Global Crossing within thirty (30) business days after
          the execution of this Agreement. Assuming timely performance of its
          obligations under this Agreement, the letter of credit shall no longer
          be required of Jato [* * *] after the later of: (a) the execution of
          this Agreement, and (b) the completion of an initial public offering
          by Jato.

     3.3  Jato's initial credit limit hereunder shall be $[* * *]. As long as
          Jato remains in good standing in meeting the payment schedule outlined
          in Schedule I, Jato's credit limit will increase to [* * *]. In the
          event that Jato's consumption accelerates beyond this schedule, Jato
          and Global Crossing agree to negotiate in good faith any additional
          credit requirements. In addition, if Jato is delinquent in payment of
          an invoice and Global Crossing does not have security from Jato in an
          amount equal to Jato's highest invoice over the prior six month period
          (or such lesser period if this Agreement has not been in effect for
          six months), Global Crossing may require security, to be mutually
          agreed upon by the parties, to be negotiated in good faith, from Jato
          in such amount. Any such security shall be provided by Jato to Global
          Crossing within ten Business Days from its receipt of Global
          Crossing's written request for security.


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<PAGE>

     3.4  Monthly recurring charges ("MRC") shall be invoiced by Global Crossing
          on a monthly basis in advance and non-recurring charges shall be
          invoiced in arrears. If the Service Date for any circuit falls on
          other than the first day of any Billing Cycle, the initial charge to
          Jato shall consist of: (i) the pro-rata portion of the applicable
          monthly charge covering the period from the Service Date to the first
          day of the subsequent Billing Cycle, and (ii) the monthly charge for
          the following Billing Cycle. Payment terms are net 30 days from the
          invoice date. Any invoice not paid by its due date shall bear late
          payment fees at the rate of 1-1/2% per month (or such lower amount as
          maybe required by law) until paid.

     3.5  The pricing and terms in Exhibit A applies to the Private Line
          Services provided between the "on-net" nodes set out in the Global
          Crossing SONET POP List attached hereto as Exhibit B. The pricing
          and terms in Exhibits C and D apply to the Dedicated Internet
          Access Services and other services stated on such Exhibits, as
          provided between the [* * *] set out in the Global Crossing IP POP
          List set out in Exhibit C. If Global Crossing's cost in providing
          the Services is increased due to circumstances beyond its
          reasonable control, or Global Crossing elects to pass through any
          governmental or regulatory assessments related to its provision of
          the Services, then Global Crossing may revise the rates and charges
          in this Agreement and any attached Exhibits upon 30 days written
          notice to Jato. Jato may cancel, without further liability (other
          than to pay for the circuit through the date of cancellation), any
          circuits subject to a rate/charge increase (other than increases
          resulting from governmental or regulatory assessments) upon written
          notice to Global Crossing given no later than [* * *] after Jato's
          receipt of the increase notice. Global Crossing agrees to a review
          of pricing every [* * *] for the Services. If the pricing in this
          Agreement is found to be [* * *] than Global Crossing's then
          current standard pricing for Services of the same type, size,
          network configuration and technical characteristics, [* * *].

     3.6  Subject to all of the terms and conditions of this Agreement, Jato
          agrees to pay a quarterly minimum charge (the "QUARTERLY MINIMUM
          CHARGE") as provided in the Ramp Revenue Schedule identified as
          Schedule I. While Schedule I includes monthly amounts, the Parties
          have agreed on a quarterly minimum structure.

          The Quarterly Minimum Charge is intended to be met through the use of
          any services offered by Global Crossing. Global Crossing may not
          currently offer some services that are of interest to Jato; [* * *].
          In addition, provided that Global Crossing procures such services for
          Jato, [* * *] provided to Jato from Global Crossing or a Global
          Crossing Affiliate [* * *]. However, Global Crossing may require, as
          mutually agreed upon by the parties, that a minimum of the Quarterly
          Minimum Charge be met [* * *] provided by Global Crossing, rather than
          its Affiliate, which minimum charge would include, among other things,
          Global Crossing [* * *].

          If Jato's net charges (after any available discounts hereunder) for
          the Services during a quarterly period are less than the Quarterly
          Minimum Charge, Jato shall pay the shortfall. Governmental assessments
          and surcharges, non-recurring charges, operator assistance charges and
          local loop and third party and regulatory pass-through charges are not
          included when calculating Quarterly Minimum Charge. If this Agreement
          is terminated prior to the time the Quarterly Minimum Charge becomes
          effective (other than termination by Jato for an uncured breach by
          Global Crossing), Jato shall be liable for the amount described in
          Section 5.5 hereof.

     3.7  If a circuit is canceled prior to expiration of its minimum term
          commitment, except if canceled by Jato under Section 3.5 hereof, or
          this Agreement is terminated for Global Crossing's uncured breach,
          Jato shall be liable for, and shall pay to Global Crossing upon
          demand, an early termination fee in an amount equal to the applicable
          monthly per circuit minimum charge times the number of months
          remaining on the unexpired term commitment (whether the initial or a
          renewal term) for the circuit.


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                                          Under 17 C.F.R. Sections 200.80(b)(4),
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<PAGE>

     3.8  Jato agrees that any minimum charge shortfall and any early
          termination fees for which it may be liable under this Agreement are
          based on agreed upon minimum commitments on its part and corresponding
          rate concessions on Global Crossing's part, and are not penalties or
          consequential or other damages under Section 6. 4 hereof.

4.   BILLING DISPUTES: Jato shall have the affirmative obligation of providing
     written notice of any dispute with an invoice within 90 days after receipt
     of the invoice by Jato (which notice shall include sufficient detail for
     Global Crossing to investigate the dispute). Jato may withhold payment only
     on amounts so disputed within 30 Business Days after Jato's receipt of the
     invoice. Jato may not withhold payment of amounts disputed after such 30
     Business Day period. If Jato does not report a dispute with respect to an
     invoice within the 90 day period, Jato is deemed to have waived its dispute
     rights for that invoice and to have agreed to pay the same. Provided Jato
     has provided sufficient detail for investigation of the dispute, Global
     Crossing will use reasonable efforts to resolve and communicate its
     resolution of the dispute within 30 Business Days of its receipt of the
     dispute notice. If the dispute is resolved in Global Crossing's favor any
     amounts to be paid by Jato shall be subject to the late payment charges
     under Section 3.4 hereof retroactive to the due date of the disputed
     invoice. Notwithstanding anything herein to the contrary, Jato shall not
     withhold any disputed amounts while its Global Crossing account is
     delinquent.

5.   TERMINATION RIGHTS:

     5.1  Either Party may terminate this Agreement upon the other Party's
          insolvency, dissolution or cessation of business operations.

     5.2  Global Crossing may, upon written notice, immediately terminate this
          Agreement for (i) Jato's failure to pay any delinquent invoice within
          ten days after receipt of written notice from Global Crossing as to
          the delinquency, or (ii) to pay any security or additional security
          within the time-frame required under Section 3.3.

     5.3  In the event of a breach of any material term or condition of this
          Agreement by a Party (other than a failure to pay or provide security
          which is covered under Section 5.2 hereof), the other Party may
          terminate this Agreement upon 30 days written notice, unless the
          breaching Party cures the breach during the 30 day period. A breach
          that cannot be reasonably cured within a 30 day period may be
          addressed by a written waiver of this paragraph signed by the Parties.

     5.4  If this Agreement is terminated prior to expiration of a circuit's
          term commitment, except if terminated by Jato under Section 5.3
          hereof, then Jato shall pay to Global Crossing upon demand an early
          termination fee in an amount equal to the aggregate sum of each
          existing circuit's monthly minimum commitment, times the number of
          months remaining on each circuit's minimum commitment period, based on
          the payment schedule outlined in Schedule I.

     5.5  If this Agreement is terminated prior to expiration of the initial
          term,, except if terminated by Jato under Section 5.3 hereof, then
          Jato shall pay to Global Crossing an amount equal to the sum of the
          remaining Quarterly Minimum Charges for the remaining portion of the
          unexpired term of this Agreement, based on the payment schedule
          outlined in Schedule I. Nothing in sections 3.7, 5.4 or 5.5 is
          intended to require that Jato make a duplicate payment to Global
          Crossing for the same item on termination of this Agreement, during
          the Initial Term or any renewal Term, or to pay an amount higher than
          the highest amount calculated under any of these three individual
          Sections, based on the then-existing remaining circuit commitments or
          remaining Quarterly Minimum Charges.

          (Remainder of page blank.)


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6.   WARRANTIES AND LIMITATION OF LIABILITY:

     6.1  The Services shall be provided by Global Crossing in accordance with
          the Service Level Parameters in this Agreement, as well as with the
          applicable technical standards established for dedicated circuit
          capacity by the telecommunications industry for a digital fiber optic
          network. Further, Global Crossing warrants that Jato's use of the
          Services will not infringe any third party's intellectual property
          rights. The foregoing intellectual property warranty shall not apply,
          and Global Crossing shall have no liability hereunder, to the extent
          that any infringement or claim thereof is based upon use of the
          Services in combination with equipment, software or services not
          provided by Global Crossing where the use of the Services alone would
          not be infringing. EXCEPT AS PROVIDED HEREIN, GLOBAL CROSSING MAKES NO
          OTHER WARRANTY, EXPRESS OR IMPLIED, WITH RESPECT TO TRANSMISSION,
          EQUIPMENT OR SERVICE PROVIDED HEREUNDER, AND EXPRESSLY DISCLAIMS ANY
          WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OR
          FUNCTION.

     6.2  The following Service Level Parameters (SLP) apply only to DS-1,
          DS-3 and OC-3 circuits with term commitments of at least one year
          used for the Dedicated Internet Access Services. The SLP cover (i)
          the [* * *] in the Global Crossing [* * *] which connects directly
          to [* * *] circuit, (ii) the Global Crossing [* * *] the Global
          Crossing [* * *], and (iii) [* * *] within Global Crossing's
          control which provide [* * *] and other functions which enable Jato
          to logically interact with the network. The SLP specifically
          exclude (a) the [* * *] between [* * *] and the Global Crossing
          [* * *], (b) [* * *] equipment either owned by Jato or provided
          through Global Crossing, (c) [* * *], and (d) other Internet
          service provider networks.

          A.   Network Availability of [* * *] measured on a monthly basis for
               Global Crossing's IP access ports and backbone network in the
               contiguous United States.

          B.   Average monthly round-trip transmission latency of no more than
               85 milliseconds within Global Crossing's backbone in the
               contiguous United States.

          C.   Global Crossing's network is monitored on a 24 hours, 7 days per
               week basis. Global Crossing shall use commercially reasonable
               efforts to provide Jato with two day's prior notice of all
               planned outages or scheduled maintenance which may cause
               significant Service degradation, and shall seek to perform
               maintenance during periods of low usage generally.

     6.3  Except as provided in Section 7 below the entire liability of Global
          Crossing for all claims of whatever nature arising out of its failure
          to provide the Services, and not caused by (i) Jato or third parties,
          or (ii) a scheduled or emergency interruption (hereafter an "Outage"),
          shall be a credit for service interruptions greater than 120
          continuous minutes (hereafter an "OUTAGE"). The amount of the credit
          is computed in accordance with the following formula (the "OUTAGE
          CREDIT"):

          [* * *]


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               A.   The Outage Credit shall apply to the charges for [* * *]
                    circuit affected by an Outage; provided, however, that if
                    any portion of the affected circuit remains useable by Jato,
                    the Outage Credit shall not apply to that pro-rata portion
                    of the mileage. The duration of each Outage shall be
                    calculated [* * *] thereof. An Outage shall be deemed to
                    have commenced upon verifiable notification thereof by Jato
                    to Global Crossing, or, when indicated by network control
                    information actually known to Global Crossing network
                    personnel, whichever is earlier. Each Outage shall be deemed
                    to terminate upon restoration of the affected circuit as
                    evidenced by appropriate network tests by Global Crossing.
                    Global Crossing shall give notice to Jato of any scheduled
                    interruption as early as is practicable, and a scheduled
                    outage shall under no circumstance be viewed as an Outage
                    hereunder.

               B.   Outage Credits shall not be granted if the malfunction of
                    any end-to-end circuit is due to an Outage or other defect
                    occurring in Jato's Interconnection Facilities.

               C.   All Outage Credits shall be credited on the next monthly
                    invoice for the affected circuit after receipt of Jato's
                    written request for credit. The total of all Outage Credits
                    applicable to or accruing in any given month shall not
                    exceed the amount payable by Jato to Global Crossing for
                    that same month for the affected circuit.

               D.   The Outage Credit described in this Section shall be the
                    sole and exclusive remedy of Jato in the event of any Outage
                    or other failure in the Services, except [* * *]. In the
                    event of such an Outage, Jato shall be afforded service
                    credits reflecting (and not less than) what Global Crossing
                    provides to other similarly affected carriers (based on the
                    average of the three most recent comparable carrier Outages.
                    .

          6.4  In no event shall either Party be liable to the other Party for
               incidental and consequential damages, loss of goodwill,
               anticipated profit, or other claims for indirect damages in any
               manner related to this Agreement or the Services.

7.   INDEMNIFICATION: Except for claims arising out of the gross negligence or
     willful misconduct of the other Party, each Party shall defend and
     indemnify the other Party and its directors, officers, employees,
     representatives and agents from any and all third party claims, taxes,
     penalties, interest, expenses, damages, third party lawsuits or other
     liabilities (including without limitation, reasonable attorney fees and
     court costs) brought against the indemnified Party, relating to or arising
     out of (i) acts or omissions in the operation of its business, and (ii) its
     material breach of this Agreement; Notwithstanding the foregoing, absent
     its gross negligence or willful misconduct, Global Crossing shall not be
     obligated to indemnify Jato for any third party claims with respect to
     services provided by Jato which may incorporate any of the Services;
     provided that the indemnified party (i) provides the indemnifying party
     prompt notice of the relevant claim, (ii) reasonably cooperates with the
     defense of such claim at the indemnifying party's expense and (iii) gives
     the indemnifying party the right to control the defense and settlement of
     any such claim.

8.   REPRESENTATION: The Parties acknowledge and agree that the relationship
     between them is solely that of independent contractors. Neither Party, nor
     their respective employees, agents or representatives, has any right, power
     or authority to act or create any obligation, express or implied, on behalf
     of the other Party.

9.   FORCE MAJEURE: Other than with respect to failure to make payments due
     hereunder, neither Party shall be liable under this Agreement for delays,
     failures to perform, damages, losses or destruction, or malfunction of any
     equipment, or any consequence thereof, beyond a party's reasonable control
     or caused or occasioned by, or due to fire, earthquake, flood, water, the
     elements, labor disputes or shortages, utility curtailments, power
     failures, explosions, civil disturbances, governmental actions, shortages
     of equipment


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<PAGE>

     or supplies, unavailability of transportation, acts or omissions of third
     parties, or any other cause beyond its reasonable control.

10.  WAIVERS: Failure of either Party to enforce or insist upon compliance with
     the provisions of this Agreement shall not be construed as a general waiver
     or relinquishment of any provision or right under this Agreement.

11.  ASSIGNMENT: Neither Party may assign or transfer its rights or obligations
     under this Agreement without the other Party's written consent, which
     consent may not be unreasonably withheld, except that either Party may
     assign this Agreement to its Affiliates or successor in interest without
     the other Party's consent. Any assignment or transfer without the required
     consent is void.

12.  CONFIDENTIALITY: Each Party agrees that all information furnished to it by
     the other Party, or to which it has access under this Agreement, shall be
     deemed the confidential and proprietary information or trade secrets
     (collectively referred to as "PROPRIETARY INFORMATION") of the Disclosing
     Party and shall remain the sole and exclusive property of the Disclosing
     Party (the Party furnishing the Proprietary Information referred to as the
     "DISCLOSING PARTY" and the other Party referred to as the "RECEIVING
     PARTY"). Each Party shall treat the Proprietary Information and the
     contents of this Agreement in a confidential manner and, except to the
     extent necessary in connection with the performance of its obligations
     under this Agreement, neither Party may directly or indirectly use or
     disclose the Proprietary Information of the Disclosing Party to anyone
     other than its employees on a need to know basis and who agree to be bound
     by the terms of this Section, without the written consent of the Disclosing
     Party. Neither Party will have any obligation with respect to Proprietary
     Information that: (i) is or becomes generally known to the public by any
     means other than a breach of the obligations of a receiving Party; (ii) was
     previously known to the receiving Party or rightly received by a receiving
     Party from a third party; or (iii) is independently developed by or for the
     receiving Party without reference to the disclosing Party's Proprietary
     Information.

13.  INTEGRATION: This Agreement and all Exhibits A-D, Schedule 1 and Attachment
     A, and other attachments are incorporated herein, and represent the entire
     agreement between the Parties with respect to the subject matter hereof,
     and supersede and merge all prior agreements, promises, understandings,
     statements, representations, warranties, indemnities and inducements to the
     making of this Agreement relied upon by either Party, whether written or
     oral.


                                       10
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>

14.  GOVERNING LAW:

     Global Crossing currently maintains regional service and operations
     centers to support customer accounts in [* * *]. This Agreement will be
     construed and enforced in accordance with the law of the state where
     Jato's account is supported, as designated by Global Crossing in this
     Agreement or as designated in Exhibits or amendments to this Agreement,
     without regard to that state's choice of law principles. The Parties
     agree that any action related to this Agreement shall be brought and
     maintained only: (i) in the Superior court of the State of [* * *] for
     the County of [* * *], if the designated customer support center is
     located in [* * *]; (ii) in a Federal or State court of competent
     jurisdiction located in [* * *] County, [* * *], if the designated
     customer support center is located in [* * *]; or (iii) in the Federal
     District Court for the Eastern District of [* * *] or a State court of
     competent jurisdiction located in [* * *] County, [* * *], if the
     designated customer support center is located in [* * *]. The Parties
     each consent to the jurisdiction and venue of such courts and waive any
     right to object to such jurisdiction and venue.

15.  NOTICES: All notices, including but not limited to, demands, requests and
     other communications required or permitted hereunder (not including
     Invoices) shall be in writing and shall be deemed given: (i) when delivered
     in person, (ii) 24 hours after deposit with an overnight delivery service
     for next day delivery, (ii) the same day when sent by facsimile
     transmission during normal business hours, receipt confirmed by sender's
     equipment, or (iii) 72 hours after deposit in the United States mail,
     postage prepaid, registered or certified mail, return receipt requested,
     and addressed to the recipient Party at the address set forth below:

     If to Global Crossing:      Global Crossing Bandwidth, Inc.
                                 180 South Clinton Avenue
                                 Rochester, New York 14646
                                 Attn: Senior Vice President North American
                                       Carrier Services
                                 Facsimile #: 716-232-9168

     with a copy to:             Global Crossing Bandwidth, Inc.
                                 180 South Clinton Avenue
                                 Rochester, New York  14646
                                 Attn: Sharon Posadni, Manager National
                                       Contract Admin.
                                 Facsimile #: 716-454-5825

     If to Jato                  Jato Communications
                                 1099 18th Street, Suite 2200
                                 Denver, Colorado  80202
                                 Attn: Jerry Dinsmore, President & CEO
                                 Fax #: 303-226-8380

16.  COMPLIANCE WITH LAWS: During the term of this Agreement, the Parties shall
     comply with all local, state and federal laws and regulations applicable to
     this Agreement and to their respective businesses. Each Party will obtain
     and maintain at its own expense any licenses, registrations, permits and
     approvals needed for it to perform its duties under this Agreement.

17.  SURVIVAL OF PROVISIONS: Any obligations of the Parties relating to monies
     owed, as well as those provisions relating to confidentiality, limitations
     on liability and indemnification, shall survive termination of this
     Agreement.


                                       11
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>

18.  UNENFORCEABLE PROVISIONS: The illegality or unenforceability of any
     provision of this Agreement does not affect the legality or enforceability
     of any other provision or portion. If any provision or portion of this
     Agreement is deemed illegal or unenforceable for any reason, there shall be
     deemed to be made such minimum change in such provision or portion as is
     necessary to make it valid and enforceable as so modified.

19.  CUMULATIVE RIGHTS AND REMEDIES: Except as may otherwise be provided herein,
     the assertion by a Party of any right or the obtaining of any remedy
     hereunder shall not preclude such Party from asserting or obtaining any
     other right or remedy, at law or in equity, hereunder.

20.  AMENDMENTS: Except as may otherwise be provided herein, any amendments or
     modifications to this Agreement must be in writing and signed by a Global
     Crossing Vice President (or higher level officer) and an authorized officer
     of Jato.

21.  AUTHORITY: Each individual executing below on behalf of a Party hereby
     represents and warrants to the other Party that such individual is duly
     authorized to so execute, and to deliver, this Agreement. By its signature
     below, each Party acknowledges and agrees that sufficient allowance has
     been made for review of this Agreement by respective counsel and that each
     Party has been advised by its legal counsel as to its legal rights, duties
     and obligations under this Agreement.

22.  TARIFFS: The Services are provided [* * *]. If the Services are or become
     [* * *] Jato's rights or obligations hereunder.

GLOBAL CROSSING BANDWIDTH, INC.              JATO COMMUNICATIONS

By: /s/ Brian V. Fitzpatrick                 By: /s/ William D. Myers
    -----------------------------------         --------------------------------
    Brian V. Fitzpatrick, President
North American Carrier Services                      William D. Myers
                                                     Chief Financial Officer

Date: 2/23/00                                Date:
     ----------------------------------           ------------------------------
By: /s/ Charles F. Barker
    -----------------------------------
    Charles F. Barker, C.F.O. Carrier Svcs.

Date: 2/23/00
     ----------------------------------


                                       12
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>


                                                                       Exhibit A
                                                                     Page 1 of 1

                              PRIVATE LINE SERVICE

                                RATES AND CHARGES

Pricing for the Private Line Services is based upon the length of the circuit
term commitment according to the following rate schedule.

<TABLE>
<CAPTION>

   -------------------------------------------------------------------------------------------------
                                                                                        MINIMUM
                                                                                    MONTHLY CHARGE
   CIRCUIT CAPACITY      [* * *] YEAR      [* * *] YEAR TERM   [* * *] YEAR TERM      PER CIRCUIT
                             TERM
   -------------------------------------------------------------------------------------------------
<S>                      <C>               <C>                 <C>                  <C>
       [* * *]             [* * *]            [* * *]              [* * *]              [* * *]
   -------------------------------------------------------------------------------------------------
       [* * *]             [* * *]            [* * *]              [* * *]              [* * *]
   -------------------------------------------------------------------------------------------------
   Notes: Pricing is per [* * *] for specific city pairs.

</TABLE>

<TABLE>
<CAPTION>
----------------------------------------------------------------------------------------------------------------------------
                                   INSTALLATION    INSTALLATION    INSTALLATION
      NON-RECURRING CHARGES        [* * *] YEAR    [* * *] YEARS  [* * *] YEARS*     REARRANGEMENT**          EXPEDITE
----------------------------------------------------------------------------------------------------------------------------
<S>                                <C>             <C>            <C>                <C>                      <C>
             [* * *]                  [* * *]         [* * *]         [* * *]           [* * *]               [* * *]
----------------------------------------------------------------------------------------------------------------------------
             [* * *]                  [* * *]         [* * *]         [* * *]           [* * *]               [* * *]
----------------------------------------------------------------------------------------------------------------------------
</TABLE>


*Installation charges are [* * *].

**Rearrangement is defined to be any move, change or rearrangement of a circuit.
Rearrangement charges are [* * *].

Upon signature of a SONET Service Request (SSR) by Jato, the Parties agree that
the SSR constitutes a firm order and should Jato cancel an ordered circuit(s)
prior to the Service Date, Jato will pay the applicable cancellation charge
below.

<TABLE>
<CAPTION>
---------------------------------------
     CIRCUIT CANCELLATION CHARGES
---------------------------------------
<S>                       <C>
       [* * *]            [* * *]
---------------------------------------
       [* * *]            [* * *]
---------------------------------------
       [* * *]            [* * *]
---------------------------------------
       [* * *]            [* * *]
---------------------------------------
       [* * *]            [* * *]
---------------------------------------
</TABLE>



                                      13
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit B
                                                                     Page 1 of 3

                  NATIONAL FIBER NETWORK POP LOCATION (by Site)

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------------------------------------
                      EXPECTED
       SITE         SERVICE DATE  STATE    LATA                    POP LOCATION                   ZIP CODE     NPA-NXX
<S>                 <C>           <C>      <C>     <C>                                            <C>          <C>
-------------------------------------------------------------------------------------------------------------------------
Akron                 [* * *]       OH      325    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Albany                [* * *]       NY      134    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Albuquerque           [* * *]       NM      664    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Altoona               [* * *]       PA      230    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Anaheim               [* * *]       CA      730    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Anaheim               [* * *]       CA      730    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Atlanta               [* * *]       GA      438    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Austin                [* * *]       TX      558    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Baltimore             [* * *]       MD      238    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Baton Rouge           [* * *]       LA      492    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Battle Creek          [* * *]       MI      348    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Billings              [* * *]       MT      650    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Birmingham            [* * *]       AL      476
-------------------------------------------------------------------------------------------------------------------------
Boise                 [* * *]       ID      652
-------------------------------------------------------------------------------------------------------------------------
Boston                [* * *]       MA      128    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Bowling Green         [* * *]       KY      464    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Bridgeport            [* * *]       CT      920    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Buffalo               [* * *]       NY      140    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Casper                [* * *]       WY      654    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Charlotte             [* * *]       NC      422    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Chattanooga           [* * *]       TN      472    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Chicago               [* * *]       IL      358    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Chico                 [* * *]       CA      724    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Cincinnati            [* * *]       OH      922    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Cleveland             [* * *]       OH      320    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Colorado Springs      [* * *]       CO      658    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Columbus              [* * *]       OH      324    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Dallas                [* * *]       TX      552    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Dayton                [* * *]       OH      328    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Daytona Beach         [* * *]       FL      456    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Denver                [* * *]       CO      656    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Detroit               [* * *]       MI      340    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Des Moines            [* * *]       IA      632    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Eau Claire            [* * *]       WI      352    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
El Paso               [* * *]       TX      540    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Erie                  [* * *]       PA      924    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Eugene                [* * *]       OR      670    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Fort Worth            [* * *]       TX      552    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Fredricksburg         [* * *]       VA      246    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Ft. Lauderdale        [* * *]       FL      460    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Ft. Myers             [* * *]       FL      939    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Green Bay             [* * *]       WI      350    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Greensboro            [* * *]       NC      424    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Greenville            [* * *]       SC      430    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Harrisburg            [* * *]       PA      226    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Helena                [* * *]       MT      648    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Houston               [* * *]       TX      560    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Houston               [* * *]       TX      560    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Indianapolis          [* * *]       IN      336    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Indianapolis          [* * *]       IN      336    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Jackson               [* * *]       MS      482    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------


                                      14
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                      Exhibit B
                                                                    Page 2 of 3

                  NATIONAL FIBER NETWORK POP LOCATION (by Site)

<CAPTION>
-------------------------------------------------------------------------------------------------------------------------
                      EXPECTED
       SITE         SERVICE DATE  STATE    LATA                    POP LOCATION                   ZIP CODE     NPA-NXX
<S>                 <C>           <C>      <C>     <C>                                            <C>          <C>
-------------------------------------------------------------------------------------------------------------------------
Jacksonville          [* * *]       FL      452    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Kansas City           [* * *]       MO      524    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Las Vegas             [* * *]       NV      721
-------------------------------------------------------------------------------------------------------------------------
Lincoln               [* * *]       NE      958    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Los Angeles           [* * *]       CA      730    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Louisville            [* * *]       KY      462    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Macon                 [* * *]       GA      446    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Medford               [* * *]       OR      670    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Melbourne             [* * *]       FL      458    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Miami                 [* * *]       FL      460    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Milwaukee             [* * *]       WI      356    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Minneapolis           [* * *]       MN      628    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Mobile                [* * *]       AL      480    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Nashville             [* * *]       TN      470    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
New London            [* * *]       CT      920    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
New Orleans           [* * *]       LA      490    [* * *]
-------------------------------------------------------------------------------------------------------------------------
New York City         [* * *]       NY      132    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Newark                [* * *]       NJ      224    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Oakland               [* * *]       CA      722    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Oklahoma City         [* * *]       OK      536    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Omaha                 [* * *]       NE      644    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Orlando               [* * *]       FL      458    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Owatonna              [* * *]       MN      620    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Pensacola             [* * *]       FL      448    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Philadelphia          [* * *]       PA      228    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Phoenix               [* * *]       AZ      666    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Phoenix               [* * *]       AZ      666    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Pittsburgh            [* * *]       PA      234    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Portland              [* * *]       OR      672    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Portsmouth            [* * *]       VA      252    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Poughkeepsie          [* * *]       NY      133    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Providence            [* * *]       RI      130    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Raleigh               [* * *]       NC      426    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Redding               [* * *]       CA      724    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Reno                  [* * *]       NV      720    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Richmond              [* * *]       VA      248    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Rochester             [* * *]       NY      974    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Rocky Mt.             [* * *]       NC      951    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Sacramento            [* * *]       CA      726    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Salinas               [* * *]       CA      736    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Salt Lake City        [* * *]       UT      660    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Antonio           [* * *]       TX      566    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Diego             [* * *]       CA      732    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Diego             [* * *]       CA      732    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Francisco         [* * *]       CA      722    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Jose              [* * *]       CA      722    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
San Luis Obispo       [* * *]       CA      740    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Santa Barbara         [* * *]       CA      740    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Seattle               [* * *]       WA      674    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
South Bend            [* * *]       IN      332    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Southfield            [* * *]       MI      340    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------



                                      15
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit B
                                                                     Page 3 of 3

                  NATIONAL FIBER NETWORK POP LOCATION (by Site)

<CAPTION>
-------------------------------------------------------------------------------------------------------------------------
                      EXPECTED
       SITE         SERVICE DATE  STATE    LATA                    POP LOCATION                   ZIP CODE     NPA-NXX
<S>                 <C>           <C>      <C>     <C>                                            <C>          <C>
-------------------------------------------------------------------------------------------------------------------------
Spokane               [* * *]       WA      676    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Springfield           [* * *]       MA      126    [* * *]
-------------------------------------------------------------------------------------------------------------------------
St. Louis             [* * *]       MO      520    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Stamford              [* * *]       CT      920    [* * *]                                         [* * *]
-------------------------------------------------------------------------------------------------------------------------
Sunnyvale             [* * *]       CA      722    [* * *]                                                     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Syracuse              [* * *]       NY      136    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Tallahassee           [* * *]       FL      953    [* * *]
-------------------------------------------------------------------------------------------------------------------------
Tampa                 [* * *]       FL      952    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Toledo                [* * *]       OH      326    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Topeka                [* * *]       KS      534    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Trenton               [* * *]       NJ      222    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Tucson                [* * *]       AZ      668    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Tulsa                 [* * *]       OK      538    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Washington            [* * *]       DC      236    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Waterford             [* * *]       PA      924    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
West Haven            [* * *]       CT      920    [* * *]
-------------------------------------------------------------------------------------------------------------------------
West Palm Beach       [* * *]       FL      460
-------------------------------------------------------------------------------------------------------------------------
Westfield             [* * *]       MA      126    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
White Plains          [* * *]       NY      132    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
White Plains          [* * *]       NY      132    [* * *]                                                     [* * *]
-------------------------------------------------------------------------------------------------------------------------
Youngstown            [* * *]       OH      322    [* * *]                                         [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------
</TABLE>


                                      16
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit C
                                                                     Page 1 of 5

         CARRIERCONNECT-SM- DEDICATED INTERNET ACCESS SERVICES SCHEDULE

                          GLOBAL CROSSING'S IP NETWORK

DEDICATED INTERNET ACCESS SERVICES permit direct access to the Internet via
Global Crossing's nationwide IP network via DS-1, DS-3, or OC-3 dedicated
circuits at speeds ranging from 1.544 mbps to 155 mbps. Connectivity is via the
dedicated circuit between Jato's router to the Global Crossing router located
nearest a Global Crossing SONET-POP. Some Global Crossing Internet services,
including webhosting and e-mail services may be procured through a Global
Crossing Affiliate, which Affiliate may alter its list of offerings and their
nature from time to time.

1.       RATES AND CHARGES.

Pricing for CarrierConnect-SM- Dedicated Internet Access Services is based
upon :

         (i)      the length of the circuit term commitment; and

         (ii)     Jato maintaining, on a monthly basis, [* * *]. If [* * *]
Global Crossing's network, then [* * *].

<TABLE>
<CAPTION>
                         MONTHLY RECURRING CHARGE (MRC)
--------------------------------------------------------------------------
                            [* * *] YEAR    [* * *] YEAR    [* * *] YEAR
CIRCUIT CAPACITY                TERM            TERM            TERM
                                MRC             MRC             MRC
--------------------------------------------------------------------------
<S>                         <C>             <C>             <C>
[* * *]                       [* * *]         [* * *]         [* * *]
--------------------------------------------------------------------------
</TABLE>

NOTES:

      (1) [* * *] access bandwidth start at a minimum of [* * *]
      (2) [* * *] access bandwidth start at a minimum of [* * *]

                           NON-RECURRING CHARGES (NRC)
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------
                          [* * *] YEAR    [* * *] YEAR    [* * *] YEAR     EXPEDITE      CHANGE CHARGE
CIRCUIT CAPACITY              TERM            TERM          TERM NRC        CHARGE
                              NRC              NRC
--------------------------------------------------------------------------------------------------------
<S>                       <C>             <C>             <C>              <C>
        [* * *]             [* * *]          [* * *]        [* * *]         [* * *]         [* * *]
--------------------------------------------------------------------------------------------------------
</TABLE>

NOTE:  A one time fee of [* * *] will be assessed for any de-installation of
       any CarrierConnect-SM- Dedicated Internet Access circuit.

Upon signature of a CarrierConnect-SM- Service Request (CCSR) by Jato, the
Parties agree that the CCSR constitutes a firm circuit order and should Jato
cancel such ordered circuit(s) prior to the Service Date Jato will pay the
applicable cancellation charge below.

<TABLE>
<CAPTION>
---------------------------------------
     CIRCUIT CANCELLATION CHARGES
---------------------------------------
<S>                       <C>
       [* * *]            [* * *]
---------------------------------------
       [* * *]            [* * *]
---------------------------------------
</TABLE>



                                      17
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit C
                                                                     Page 2 of 5

2.       Global Crossing Acceptable Use and Security Policies

         2.1      Jato and its customers shall comply with Global Crossing's
                  Acceptable Use and Security Policies (collectively, the
                  "Policy"), which Policy Global Crossing may modify at any
                  time. The current, complete Policy is available for review at
                  http://www.globalcenter.net/aup/ (Global Crossing may change
                  the Policy and website address via electronic notice). Without
                  limiting the Policy, generally, neither Jato nor its customers
                  may use Global Crossing's network, machines, or services in
                  any manner which:

                  (i)      violates any applicable law, regulation, treaty, or
                           tariff;

                  (ii)     violates the acceptable use policies of any networks,
                           machines; or services which are accessed through
                           Global Crossing's network;

                  (iii)    infringes on the intellectual property rights of
                           others.

                  Prohibited activity includes, but is not limited to,
                  unauthorized use (or attempted unauthorized use) of any
                  machines or networks; denial of service attacks; falsifying
                  header information or user identification or information;
                  monitoring or scanning the networks of others without
                  permission; sending unsolicited bulk e-mail; maintaining an
                  open mail relay; collecting e-mail addresses from the Internet
                  for the purpose of sending unsolicited bulk e-mail or to
                  provide collected addresses to others for that purpose; and
                  transmitting or receiving copyright-infringing or obscene
                  material.

         2.2      Jato and its customers are responsible for the security of
                  their own networks and machines. Global Crossing assumes no
                  responsibility or liability for failures or breach of
                  Jato-imposed protective measures, whether implied or actual.
                  Abuse that occurs as a result of Jato's systems or account
                  being compromised may result in suspension of the Dedicated
                  Internet Access Services or account access by Global Crossing.
                  If a security related problem is escalated to Global Crossing
                  for resolution, Global Crossing will resolve the problem in
                  accordance with its then-current Policy. Without limiting the
                  Policy, generally, the following activities are prohibited:

                  (i)      fraudulent activities of any kind;

                  (ii)     network disruptions of any kind;

                  (iii)    unauthorized access, exploitation, or monitoring.

         2.3      Jato shall be responsible for enforcing the Policy for any
                  third parties (including its customers) accessing the Internet
                  through Jato's use of the Network Services; and shall defend
                  and indemnify Global Crossing with respect to claims related
                  to such third party access.

         2.4      Global Crossing reserves the right to suspend the Dedicated
                  Internet Access Services for Jato's or its customers' failure
                  to comply with the requirements of Global Crossing's
                  then-current Policy. Further, Global Crossing may terminate
                  the Dedicated Internet Access Services for recurring
                  violations of the Policy by Jato or its customers.



                                      18
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit C
                                                                     Page 3 of 5

                 CARRIERCONNECT-SM- DEDICATED INTERNET ACCESS

                                 IP POP LIST

<TABLE>
<CAPTION>
-----------------------------------------------------------
                                              GENERAL
   LATA       POP            CITY           AVAILABILITY
-----------------------------------------------------------
<S>         <C>         <C>                 <C>
 [* * *]    [* * *]     San Francisco         [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]      Los Angeles          [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]       Cleveland           [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]     New York City         [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]     Washington, DC        [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]      Kansas City          [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Seattle            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]       Rochester           [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Denver            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Chicago            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Dallas            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Boston            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]      Philadelphia         [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Atlanta            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Detroit            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Houston            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Phoenix            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Austin            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Raleigh            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]       San Diego           [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Tampa             [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]         Miami             [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]        Orlando            [* * *]
-----------------------------------------------------------
 [* * *]    [* * *]      Minneapolis          [* * *]
-----------------------------------------------------------
</TABLE>



                                      19
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit C
                                                                    Page  4 of 5

                                 SONET-POP LIST

<TABLE>
<CAPTION>
---------------------------------------------------------------   ------------------------------------------------------------
                                          SWITCH       WHIP                                               SWITCH      WHIP
  LATA       ST            CITY           NPA-NXX      HUB          LATA     ST           CITY           NPA-NXX       HUB
---------------------------------------------------------------   ------------------------------------------------------------
<S>          <C>      <C>                 <C>        <C>          <C>        <C>      <C>                <C>
 [* * *]     OH           Akron           [* * *]    [* * *]      [* * *]    NC        Greensboro        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     NY           Albany          [* * *]    [* * *]      [* * *]    SC        Greenville        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     NM        Albuquerque        [* * *]    [* * *]      [* * *]    PA        Harrisburg        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     PA          Altoona          [* * *]    [* * *]      [* * *]    MT          Helena          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     CA          Anaheim          [* * *]    [* * *]      [* * *]    TX         Houston          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     GA          Atlanta          [* * *]    [* * *]      [* * *]    IN       Indianapolis       [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     TX           Austin          [* * *]    [* * *]      [* * *]    MS         Jackson          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     MD         Baltimore         [* * *]    [* * *]      [* * *]    FL       Jacksonville       [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     LA        Baton Rouge        [* * *]    [* * *]      [* * *]    MO       Kansas City        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     MI        Battle Creek       [* * *]    [* * *]      [* * *]    NV        Las Vegas         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     MT          Billings         [* * *]    [* * *]      [* * *]    NE         Lincoln          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     AL         Birmingham        [* * *]    [* * *]      [* * *]    CA       Los Angeles        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     ID           Boise           [* * *]    [* * *]      [* * *]    KY        Louisville        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     MA           Boston          [* * *]    [* * *]      [* * *]    GA          Macon           [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     KY          Bowling          [* * *]    [* * *]      [* * *]    FL          Miami           [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     NY          Buffalo          [* * *]    [* * *]      [* * *]    WI        Milwaukee         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     WY           Casper          [* * *]    [* * *]      [* * *]    MN       Minneapolis        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     NC         Charlotte         [* * *]    [* * *]      [* * *]    AL          Mobile          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     TN        Chattanooga        [* * *]    [* * *]      [* * *]    TN        Nashville         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     IL          Chicago          [* * *]    [* * *]      [* * *]    LA       New Orleans        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     OH         Cincinnati        [* * *]    [* * *]      [* * *]    NY      New York City       [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     OH         Cleveland         [* * *]    [* * *]      [* * *]    NJ          Newark          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     CO          Colorado         [* * *]    [* * *]      [* * *]    CA         Oakland          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     OH          Columbus         [* * *]    [* * *]      [* * *]    OK         Oklahoma         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     TX           Dallas          [* * *]    [* * *]      [* * *]    NE          Omaha           [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     OH           Dayton          [* * *]    [* * *]      [* * *]    FL         Orlando          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     FL          Daytona          [* * *]    [* * *]      [* * *]    FL        Pensacola         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     CO           Denver          [* * *]    [* * *]      [* * *]    PA       Philadelphia       [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     IA         Des Moines        [* * *]    [* * *]      [* * *]    AZ         Phoenix          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     MI          Detroit          [* * *]    [* * *]      [* * *]    PA        Pittsburgh        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     WI         Eau Claire        [* * *]    [* * *]      [* * *]    OR         Portland         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     TX          El Paso          [* * *]    [* * *]      [* * *]    NY       Poughkeepsie       [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     PA            Erie           [* * *]    [* * *]      [* * *]    RI        Providence        [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     OR           Eugene          [* * *]    [* * *]      [* * *]    NC         Raleigh          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     TX         Fort Worth        [* * *]    [* * *]      [* * *]    CA         Redding          [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     FL       Ft. Lauderdale      [* * *]    [* * *]      [* * *]    NV           Reno           [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     FL         Ft. Myers         [* * *]    [* * *]      [* * *]    VA         Richmond         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
 [* * *]     WI         Green Bay         [* * *]    [* * *]      [* * *]    NY        Rochester         [* * *]     [* * *]
---------------------------------------------------------------   ------------------------------------------------------------
</TABLE>



                                      20
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit C
                                                                    Page  5 of 5

                                 SONET-POP LIST
<TABLE>
<CAPTION>
---------------------------------------------------------------
                                          SWITCH       WHIP
  LATA       ST            CITY           NPA-NXX      HUB
---------------------------------------------------------------
<S>          <C>    <C>                   <C>        <C>
 [* * *]     NC        Rocky Mount        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA         Sacramento        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA          Salinas          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     UT         Salt Lake         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     TX        San Antonio        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA         San Diego         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA       San Francisco       [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA          San Jose         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CA    San LuisObispo         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     WA          Seattle          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     IN         South Bend        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     MI         Southfield        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     WA          Spokane          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     MA        Springfield        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     MO         St. Louis         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     CT          Stamford         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     NY          Syracuse         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     FL        Tallahassee        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     FL           Tampa           [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     OH           Toledo          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     KS           Topeka          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     AZ           Tucson          [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     OK           Tulsa           [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     DC         Washington        [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     FL         West Palm         [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     NY        White Plains       [* * *]    [* * *]
---------------------------------------------------------------
 [* * *]     OH         Youngstown        [* * *]    [* * *]
---------------------------------------------------------------
</TABLE>

Global Crossing agrees to provide connectivity from Global Crossing's SONET POPs
to Global Crossing's WHIP POP's at Global Crossing's expense for the following
routes and locations previously engineered and quoted:

                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]
                         [* * *]



                                      21
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit D
                                                                     Page 1 of 3

1.   CarrierConnect-SM- IP Plus

     Global Crossing or a Global Crossing Affiliate will provide Jato with
     Internet access according to the following price schedule:

                         CARRIERCONNECT IP PLUS PRICING

<TABLE>
<CAPTION>
              -----------------------------------------------------------------------------------------------------------------
                      INSTALLATION CHARGES              MONTHLY RECURRING CHARGES                     PRICE/MB
              -----------------------------------------------------------------------------------------------------------------
               [* * *]      [* * *]      [* * *]    [* * *]      [* * *]      [* * *]      [* * *]      [* * *]     [* * *]
                YEAR         YEAR         YEAR       YEAR         YEAR         YEAR         YEAR         YEAR        YEAR
-------------------------------------------------------------------------------------------------------------------------------
  FLLU DS-1    [* * *]      [* * *]      [* * *]    [* * *]      [* * *]      [* * *]      [* * *]      [* * *]     [* * *]
-------------------------------------------------------------------------------------------------------------------------------
    MBPS                                   [* * *] ACCESS REQUIRES A MINIMUM OF [* * *].
-------------------------------------------------------------------------------------------------------------------------------
<S>            <C>          <C>          <C>        <C>          <C>          <C>          <C>          <C>          <C>
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
   [* * *]     [* * *]      [* * *]        $ -      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]      [* * *]
-------------------------------------------------------------------------------------------------------------------------------
</TABLE>


2.  IP Plus Service includes Global Crossing's CarrierConnect-SM- Internet
access service, plus enhanced IP Transit Services. IP Plus is designed to
satisfy the "Routerless" requirements in Jato's off-net cities and includes
provisioning Jato's end users' enhanced IP services, mail, news, and other
applications.

3.  For the term of this Agreement, Jato appoints Global Crossing as its
"Strategic Preferred Supplier" with respect to transport above layer 2
transport, and of IP Transit and IP Plus Services and future services and
applications related thereto as made available and offered by Global Crossing
(hereafter referred to as "Transit Services and Applications"). Transit
Services and Applications do not include [* * *]. "Strategic Preferred
Supplier" means that Global Crossing shall receive a right to bid on all
Transit Services and Applications required by Jato, provided that such bid
must be made in writing. Global Crossing will be the "Strategic Preferred
Supplier" of such Transit Services and Applications; provided however,
acceptance of any bid by Jato shall be contingent upon a



                                      22
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>

determination by Jato, including but not to be limited by pricing, service
level commitments, availability, functionality and marketability, that Global
Crossing products and services are equal to or better than other similar
product and service offerings made available to Jato by third parties. Global
Crossing shall periodically advise Jato of new Transit Services and
Applications introduced or scheduled for introduction. Global Crossing shall
have ten (10) business days after receipt by Global Crossing of a
solicitation for bid notice from Jato to provide to Jato a qualified bid, to
be considered with bids from other qualified parties. Jato shall not enter
into a commitment for Transit Services or Applications without notice to
Global Crossing of a bid opportunity. Such Strategic Preferred Supplier
status shall not apply where [* * *] of the scheduled introduction of such
new Transit Services and Applications; [* * *].



                                      23
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit D
                                                                     Page 2 of 3

2.       Mail Services

         Global Crossing or a Global Crossing Affiliate will provide e-mail
         accounts (storage space, account assignment) to JATO (or to the
         end-user clients of JATO). Global Crossing or a Global Crossing
         Affiliate will provide an initial [* * *] of storage space per user
         account. Global Crossing or a Global Crossing Affiliate will offer
         storage upgrades and end-user provisioning of individual e-mail
         accounts on a [* * *] e-mail server.

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
                                    SUMMARY OF E-MAIL CHARGES
---------------------------------------------------------------------------------------------------
E-MAIL SERVICE                                                       NON-RECURRING CHARGES
---------------------------------------------------------------------------------------------------
<S>                                                                  <C>
New Account Set-up, 1 Year Term                                                 [* * *]
---------------------------------------------------------------------------------------------------
New Account Set-up, 2 Year Term                                                 [* * *]
---------------------------------------------------------------------------------------------------
New Account Set-up, 3 Year Term                                                 [* * *]
---------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------
          BASIC [* * *] MAIL SERVICE,
           ACCESS VIA POP OR WEB MAIL                MONTHLY RECURRING CHARGES
-----------------------------------------------------------------------------------
<S>                                                  <C>
                    1 - 9,999                                 [* * *]
-----------------------------------------------------------------------------------
                 10,000 - 49,999                              [* * *]
-----------------------------------------------------------------------------------
                 50,000 - 99,999                              [* * *]
-----------------------------------------------------------------------------------
                100,000 - 499,999                             [* * *]
-----------------------------------------------------------------------------------
                    500,000+                                  [* * *]
-----------------------------------------------------------------------------------
</TABLE>




<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------
              ADDITIONAL CAPACITY                    MONTHLY RECURRING CHARGES
-----------------------------------------------------------------------------------
<S>                                                  <C>
                    1 - 9,999                                 [* * *]
-----------------------------------------------------------------------------------
                 10,000 - 49,999                              [* * *]
-----------------------------------------------------------------------------------
                 50,000 - 99,999                              [* * *]
-----------------------------------------------------------------------------------
                100,000 - 499,999                             [* * *]
-----------------------------------------------------------------------------------
                    500,000+                                  [* * *]
-----------------------------------------------------------------------------------
</TABLE>


3.       IP Addressing and PVC Provisioning

         After successful completion by JATO and acceptance by Global Crossing
         of the IP Justification Form (GBLX form cs311), Global Crossing or a
         Global Crossing Affiliate will obtain for JATO the IP Addresses
         necessary for JATO's applications. In addition, Global Crossing or a
         Global Crossing affiliate [* * *] into the Global Crossing Internet
         Platform.

                              SUMMARY OF IP CHARGES

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
   #IP ADDRESSES        NON-RECURRING CHARGE        #IP ADDRESSES        NON-RECURRING CHARGE
---------------------------------------------------------------------------------------------------
<S>                     <C>                         <C>                  <C>
         1                     [* * *]                    16                    [* * *]
---------------------------------------------------------------------------------------------------
         2                     [* * *]                    32                    [* * *]
---------------------------------------------------------------------------------------------------
         3                     [* * *]                    64                    [* * *]
---------------------------------------------------------------------------------------------------
         4                     [* * *]                    128                   [* * *]
---------------------------------------------------------------------------------------------------
         8                     [* * *]                    256                   [* * *]
---------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------
                                  SUMMARY OF PVC CHARGES
--------------------------------------------------------------------------------------------------
<S>                                                                 <C>
[* * *] (Non-Recurring Charge)                                      [* * *]
                                                                    [* * *]
--------------------------------------------------------------------------------------------------
</TABLE>




                                      24
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                       Exhibit D
                                                                     Page 3 of 3

4.       News Services

         Global Crossing or a Global Crossing Affiliate will provide for JATO
         News Access, offering individual access to newsgroups, where such
         access can be made commercially available. (End-user clients subscribe
         to Usenet groups using Netscape, Microsoft or other compatible
         newsreaders.) Global Crossing will provide JATO the news server address
         and other information necessary for this access. JATO will provide to
         Global Crossing lists of IPs to allow access (subscribers).

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------
                         SUMMARY OF NEWS ACCESS CHARGES
---------------------------------------------------------------------------------
<S>                                                              <C>
         News Access (Monthly Recurring Charge)                  [* * *]
---------------------------------------------------------------------------------
</TABLE>


5.      DNS (Domain Name Service)

        Global Crossing or a Global Crossing Affiliate will obtain a list of
        requested domain names from JATO. When the names are available (that is,
        not already registered to another account) according to domain name
        registry databases (maintained by InterNIC), Global Crossing will obtain
        on behalf of JATO the requested domain name where such name is available
        and insure that DNS tables are updated to include the domain name.
        (Note: InterNIC will bill JATO directly for the domain name service.
        Currently, InterNIC charges $70 for the initial 2 years and $35 for each
        additional year.)

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------
                            SUMMARY OF DNS CHARGES
-------------------------------------------------------------------------------
<S>                                              <C>
Register New Domain                              [* * *]
-------------------------------------------------------------------------------
Transfer Existing Domain                         [* * *]
-------------------------------------------------------------------------------
Provision Domains on Mail platform               [* * *]
-------------------------------------------------------------------------------
</TABLE>





                                      25
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                      Schedule I
                                                                     Page 1 of 2

              JATO REVENUE SCHEDULE - QUARTERLY COMMITMENT OUTLINE

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------
    RAMP                            MINIMUM                           QUARTERLY          YEAR          YEAR TOTAL
    MONTH          MONTH/YEAR       CHARGE        QUARTER/YEAR         TOTAL            TOTAL           AMOUNT
-----------------------------------------------------------------------------------------------------------------
<S>               <C>               <C>           <C>                 <C>          <C>                  <C>
      1              Feb-00         [* * *]
      2              Mar-00         [* * *]
      3              Apr-00         [* * *]
      4              May-00         [* * *]
      5              Jun-00         [* * *]
      6              Jul-00         [* * *]
      7              Aug-00         [* * *]
      8              Sep-00         [* * *]      [* * *]              [* * *]
      9              Oct-00         [* * *]
     10              Nov-00         [* * *]
     11              Dec-00         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
     12              Jan-01         [* * *]
     13              Feb-01         [* * *]
     14              Mar-01         [* * *]      [* * *]              [* * *]
     15              Apr-01         [* * *]
     16              May-01         [* * *]
     17              Jun-01         [* * *]      [* * *]              [* * *]
     18              Jul-01         [* * *]
     19              Aug-01         [* * *]
     20              Sep-01         [* * *]      [* * *]              [* * *]
     21              Oct-01         [* * *]
     22              Nov-01         [* * *]
     23              Dec-01         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
     24              Jan-02         [* * *]
     25              Feb-02         [* * *]
     26              Mar-02         [* * *]      [* * *]              [* * *]
     27              Apr-02         [* * *]
     28              May-02         [* * *]
     29              Jun-02         [* * *]      [* * *]              [* * *]
     30              Jul-02         [* * *]
     31              Aug-02         [* * *]
     32              Sep-02         [* * *]      [* * *]              [* * *]
     33              Oct-02         [* * *]
     34              Nov-02         [* * *]
     35              Dec-02         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
     36              Jan-03         [* * *]
     37              Feb-03         [* * *]
     38              Mar-03         [* * *]      [* * *]              [* * *]
     39              Apr-03         [* * *]
     40              May-03         [* * *]
     41              Jun-03         [* * *]      [* * *]              [* * *]
     42              Jul-03         [* * *]
     43              Aug-03         [* * *]
     44              Sep-03         [* * *]      [* * *]              [* * *]
     45              Oct-03         [* * *]
     46              Nov-03         [* * *]
----------------------------------------------------------------------------------------------------------------
     47              Dec-03         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------





                                      26
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>



                                                                      Schedule I
                                                                     Page 2 of 2

                              JATO REVENUE SCHEDULE

<CAPTION>
-----------------------------------------------------------------------------------------------------------------
    RAMP                            MINIMUM                           QUARTERLY          YEAR          YEAR TOTAL
    MONTH          MONTH/YEAR       CHARGE        QUARTER/YEAR         TOTAL            TOTAL           AMOUNT
-----------------------------------------------------------------------------------------------------------------
<S>               <C>               <C>           <C>                 <C>          <C>                  <C>
     48              Jan-04         [* * *]
     49              Feb-04         [* * *]

     50              Mar-04         [* * *]      [* * *]              [* * *]
     51              Apr-04         [* * *]
     52              May-04         [* * *]

     53              Jun-04         [* * *]      [* * *]              [* * *]
     54              Jul-04         [* * *]
     55              Aug-04         [* * *]

     56              Sep-04         [* * *]      [* * *]              [* * *]
     57              Oct-04         [* * *]
     58              Nov-04         [* * *]

     59              Dec-04         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
     60              Jan-05         [* * *]
     61              Feb-05         [* * *]

     62              Mar-05         [* * *]      [* * *]              [* * *]
     63              Apr-05         [* * *]
     64              May-05         [* * *]

     65              Jun-05         [* * *]      [* * *]              [* * *]
     66              Jul-05         [* * *]
     67              Aug-05         [* * *]

     68              Sep-05         [* * *]      [* * *]              [* * *]
     69              Oct-05         [* * *]
     70              Nov-05         [* * *]

     71              Dec-05         [* * *]      [* * *]              [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
     72              Jan-06         [* * *]                           [* * *]      [* * *]              [* * *]
----------------------------------------------------------------------------------------------------------------
                                    [* * *]    CONTRACT TOTAL         [* * *]    CONTRACT TOTAL         [* * *]
                            ------------------------------------------------------------------------------------
</TABLE>





                                      27
                                           *** Text Omitted and Filed Separately
                                                Confidential Treatment Requested
                                          Under 17 C.F.R. Sections 200.80(b)(4),
                                                            200.83 and 240.24b-2

<PAGE>


                                                                    Attachment A

               [LOGO]                                             SHARON POSADNI
                                                 Manager National Contract Admin
                                                             Phone: 716-777-4799
                                                               Fax: 716-454-5825

           FRONTIER COMMUNICATIONS OF THE WEST, INC. ("FRONTIER")
                         A GLOBAL CROSSING LTD. COMPANY

                     ----------------------------------
                              SERVICE REQUEST
                     ----------------------------------

To:              Jato Communications Corporation
Attn:            Jerry Dinsmore, President and CEO
Date:            February 2, 2000
Subject:         CarrierConnect-SM- Dedicated Internet Access Service Request
Facsimile #:     303-226-8380

PLEASE SIGN, DATE AND RETURN VIA FACSIMILE TO MY ATTENTION    SERVICE REQUEST #1

================================================================================

By signature below, Jato acknowledges acceptance of this Service Request for
CarrierConnect-SM- Dedicated Internet Access Service under the ISP Capacity
Agreement between Global Crossing Bandwidth, Inc. (f/k/a Frontier Communications
of the West, Inc. ) ("Global Crossing") and Jato Communications Corporation
("Jato" or "Purchaser"), dated simultaneously with this Service Request (the
"Agreement"). All terms and conditions under the Agreement are applicable unless
otherwise stated below and are incorporated herein.

1.       Global Crossing will order and install the following circuit(s) for
         Jato. Jato shall be charged the applicable MRC (as defined below) and
         any other applicable charges as described under the Agreement.

                            CUSTOMER SPECIFIC PRICING

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------
                                                           MRC PER
   QUANTITY                CIRCUIT CAPACITY                  MBPS           TOTAL MRC       TERM
-----------------------------------------------------------------------------------------------------
<S>             <C>                                        <C>              <C>            <C>
      1         [* * *]                                     [* * *]          [* * *]       [* * *]
-----------------------------------------------------------------------------------------------------
      1         [* * *]                                     [* * *]          [* * *]       [* * *]
-----------------------------------------------------------------------------------------------------
      1         [* * *]                                     [* * *]          [* * *]       [* * *]
-----------------------------------------------------------------------------------------------------
      1         [* * *]                                     [* * *]          [* * *]       [* * *]
-----------------------------------------------------------------------------------------------------
      1         [* * *]                                     [* * *]          [* * *]       [* * *]
-----------------------------------------------------------------------------------------------------
</TABLE>

2.       Upon signature by Jato below, the Parties agree that this Service
         Request constitutes a firm circuit order and should Jato cancel the
         above ordered circuit(s) prior to the Service Date as described under
         the Agreement, Jato will pay the applicable cancellation charge below:

<TABLE>
<CAPTION>
------------------------------------------------------------
       CARRIERCONNECT-SM- CIRCUIT CANCELLATION CHARGES
------------------------------------------------------------
<S>                                    <C>
         [* * *]                       [* * *]
------------------------------------------------------------
         [* * *]                       [* * *]
------------------------------------------------------------
</TABLE>

3. The Parties agree that a signed facsimile hereof shall be binding.

         JATO COMMUNICATIONS CORPORATION

         By:  _________________________________
                  Jerry Dinsmore
                  President and CEO

         Date: _______________________________