Document:

<PAGE>   1
                                                                   Exhibit 10.27

[MCI WORLDCOM LOGO]

                         PRIVATE LINE SERVICE AGREEMENT

This Service Agreement (the "Agreement") for services described below is made
by and between MCI WORLDCOM Communications, Inc., formerly known as and doing
business as WorldCom Technologies, Inc. ("MCI WORLDCOM") and

Customer Name: TELOCITY, INC. (hereinafter "Customer"), with its principal
office at 10355 N. DeAnza Blvd.; Cupertino, CA 95014.

SECTION I: SERVICE AGREEMENT

1.   SERVICE: MCI WORLDCOM will provide the following service (the "Service")
     pursuant to the applicable tariffs of MCI WORLDCOM and its affiliates and
     subsidiaries (the "Tariffs") (choose one):

<TABLE>

     <S>                                         <C>
     [ ] International Private Line              [ ] Digital Private Line (DS0)
     [ ] Managed International Private Line      [ ] Digital Private Line (Fractional DS1)
     [ ] Metro Private Line                      [X] DIGITAL PRIVATE LINE (DS1)
     [ ] Voice Grade Private Line                [ ] Digital Private Line (Fractional DS3)
     [X] SONET (OC-3)                            [X] DIGITAL PRIVATE LINE (DS3)
</TABLE>

     The Tariffs provide terms and conditions of the Service which include, but
     are not limited to, taxes, pricing, discounts, credit approval procedures,
     Customer credits, termination liability, and limitations with respect to
     the assignment of the Service. The Tariffs may be modified from time to
     time by MCI WORLDCOM in accordance with law and thereby affect the Service
     furnished to Customer. In the event of a conflict between the Tariffs and
     this Agreement the terms and conditions of the Tariffs shall control.

2.   EFFECTIVE DATE: For the purposes of this Agreement, (i) if Customer has an
     existing service agreement with MCI WORLDCOM, the "Effective Date" will be
     the next billing cycle following the date this Agreement has been executed
     and Customer has received a satisfactory credit review and approval from
     MCI WORLDCOM's Credit Department, and all security documentation, if any,
     required by MCI WORLDCOM has been properly executed and delivered to MCI
     WORLDCOM (collectively, the "Credit Review"); and (ii) if Customer does not
     have an existing service agreement with MCI WORLDCOM, the "Effective Date"
     will be the date this Agreement has been executed and the Credit Review has
     been completed.

3.   CIRCUITS AND CONNECTIONS: Customer shall receive the following pursuant to
     this Agreement:

                      MCI WORLDCOM DOMESTIC PRIVATE LINE*

<TABLE>
      <S>                 <C>
      DS-1                [*]
      DS-3 Linear         [*]
      DS-3 Restorable     [*]
      OC-3 Linear         [*]
      OC-3 Restorable     [*]
</TABLE>

      * Rates will apply to Inter-exchange Carrier (IXC) charges only
      * Rates will apply to Tier A cities only (all other are ICB)
      * Local access is additional and non-discountable.

                           MCI WORLDCOM LOCAL ACCESS
<TABLE>
<CAPTION>
             SERVICE     TYPE(1)       MILE(2)         PRICING
             <S>         <C>           <C>             <C>
             DS-3        1             0 mile          [*]
             DS-3        1             1 mile          [*]
</TABLE>

     (1) Type I sites consist of sites which are provisioned entirely on MCI
         WORLDCOM's local network.

     (2) Each additional mile is [*] per mile.

4.   REVENUE COMMITMENT: Customer agrees to the following minimum Monthly
     Revenue Commitment ("MRC") of [*] for a forty-five (45)-month term with a
     nine (9) month [ILLEGIBLE] receive the associated rates as set forth in
     Section 3 above and in the applicable Tariffs [ILLEGIBLE].

5.   MONTHLY UNDERUTILIZATION: If Customer's usage fails to meet the MRC,
     Customer will pay [*] of the difference between Customer's usage during
     each month and Customer's MRC. Monthly usage in excess of the MRC cannot be
     carried forward to another month.

                                  Page 1 of 2

     Please mail originals to: MCI WorldCom Sales Contracts Administration,
              500 Clinton Center Drive, Bldg. 4; Clinton, MS 39056

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.

                     CONFIDENTIAL - PROPRIETARY INFORMATION           REV 6/8/99

<PAGE>   2
[MCI WORLDCOM LOGO]

6.   LETTER OF AGENCY ("LOA"): The undersigned hereby authorizes MCI WORLDCOM
     and/or the Local Exchange Company ("LEC"), and/or Foreign
     Telecommunications Provider ("FTP"), if requested by Customer, to provision
     Customer's Local Access. This LOA supersedes all previous LOAs and shall
     remain in effect until canceled by Customer in writing.

7.   COMPLETE AGREEMENT: This Agreement, including the MCI WORLDCOM Application
     for Credit, the Tariffs and any documents incorporated herein by reference,
     constitutes the full understanding of the parties and supersedes any prior
     agreements between the parties relating to the Service. Alterations to this
     Agreement shall render this Agreement null and void. Customer acknowledges
     that MCI WORLDCOM is under no duty, implied or otherwise, to activate the
     Service and will not be subject to liability, if any, under the terms of
     this Agreement until such Service is activated.

8.   SIGNATURE AUTHORIZATION: The parties have duly executed and agreed to be
     bound by this Agreement as evidenced by the signatures of their authorized
     representatives below. Each party represents and warrants to the other that
     the signatory identified beneath its name below has full authority to
     execute this Agreement on its behalf.

ACCEPTED BY:                                   ACCEPTED BY:
TELOCITY, INC.                                 MCI WORLDCOM COMMUNICATIONS, INC.

By:  /s/ [SIGNATURE ILLEGIBLE]                 By: /s/ FRANK GRILLO
   -----------------------------                  ------------------------------

Name: Matt [ILLEGIBLE]                         Name: Frank Grillo,
     ---------------------------                    ----------------------------

Title:  VP Legal                               Title: V.P. Marketing
      --------------------------                     ---------------------------

Date:     10-10-99                             Date:  10-18-99
     ---------------------------                    ----------------------------

                                  Page 2 of 2

     Please mail originals to: MCI WorldCom Sales Contracts Administration,
              500 Clinton Center Drive, Bldg. 4; Clinton, MS 39056

                     CONFIDENTIAL - PROPRIETARY INFORMATION           REV 6/8/99

<PAGE>   3

[WORLDCOM LOGO]               PRIVATE LINE SERVICE              Log #
                                   ORDER FORM                        -----------
                                                                SO #
                                                                     -----------
                                                                     Page 1 of 2
                                                           Today's Date: 7/13/99
                                                     Sales Office: San Francisco

SECTION I: SERVICE AGREEMENT

This Service Agreement (the "Agreement") for services described below is made
by and between WorldCom Technologies, Inc. ("WorldCom") and Customer Name:
Telocity, Inc. (hereinafter "Customer").

1.   SERVICE: WorldCom will provide Private Line service ("Service") pursuant
to the applicable tariffs of WorldCom Network Services, Inc., a wholly owned
subsidiary of WorldCom (the "Tariffs"). The Tariffs provide terms and
conditions of the Service which include, but are not limited to, taxes, credit
approval procedures, Customer credits, termination liability and limitations
with respect to the assignment of the Service. The Tariffs may be modified from
time to time by WorldCom in accordance with law and thereby affect the Service
furnished to Customer.

2.   TERMS AND CONDITIONS: For the convenience of the parties, Service will be
provided by WorldCom subject to the rules and regulations set forth in the
applicable Tariff, in addition to the terms and conditions set forth herein.
(Check the appropriate box.)

(a)  Service Commitment Period ("Service Commitment Period"):
[ ] month to month [ ] 1 Year [ ] 2 Year [X] 3 Year [ ] 4 Year [ ] 5 Year

(b)  Service Location*/Type

<TABLE>
<CAPTION>
     Loc. A NPA-NXX    Loc. Z NPA-NXX     Access Type                      Circuit Type
<S>                    <C>                <C>                              <C>
[*]
</TABLE>
--------
* Additional customer service locations, if applicable, shown on attachment A
  attached hereto and incorporated herein.

(c)  Effective Date: For purposes of this Agreement, (i) if Customer has an
existing service agreement with WorldCom, the "Effective Date" will be the next
billing cycle following the date this Agreement has been executed and Customer
has received a satisfactory credit review and approval from WorldCom's Credit
Department, and all security documentation, if any, required by WorldCom has
been properly executed and delivered to WorldCom (collectively, the "Credit
Review"), and (ii) if Customer does not have an existing service agreement with
WorldCom, the "Effective Date" will be the date this Agreement has been
executed and the Credit Review has been completed.

3.   CHARGES/DISCOUNTS: During the Service commitment period of this Agreement,
Customer shall receive rates and discounts for Service as set forth in the
Tariff.

4.   LETTER OF AGENCY ("LOA"): The undersigned [duly authorized representative
of Customer] hereby authorizes WorldCom and/or the Local Exchange Company
("LEC"), if requested by Customer, to provision Customer's local access. This
LOA supersedes all previous LOAs and shall remain in effect until canceled by
Customer in writing.

This Agreement, including the WorldCom Application for Credit, the Tariffs and
any documents incorporated herein by reference, constitutes the full
understanding of the parties and supersedes any prior agreements between the
parties relating to private line telecommunications services. Alterations to
this Section I of the WORLDCOM PRIVATE LINE SERVICE AGREEMENT/SERVICE ORDER
shall render this Agreement null and void. Activation of Service shall indicate
WorldCom's acceptance of this Agreement.

ATTACHMENT: YES [X]  NO [ ] (see "Private Line Service Agreement")

AS AUTHORIZED AGENT OF CUSTOMER, I AGREE TO THE ABOVE TERMS AND CONDITIONS:

NAME: * Peter Olson                     SIGNATURE: * /s/ PETER OLSON
       ---------------------------                  ------------------------

TITLE: * CTO                            COMPANY/ACCOUNT NAME: Telocity, Inc.
       ---------------------------                            --------------

DATE: 9-13-99
      ----------------------------

NOTE 1: This order is for interconnection with Bell South.

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.
<PAGE>   4
WORLD COM                                                            Page 2 of 2
                                                            Today's Date 9/13/99
                                                  Customer Abbreviation TELOCITY

<TABLE>
<CAPTION>
Service Location/Type
Loc. A NPA-NXX          Loc. Z NPA-NXX   Access Type                    Circuit Type
<S>                     <C>              <C>                            <C>
[*]
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
_______                 _______          [ ] DS-0  [ ] DS-1  [ ] DS-2   [ ] DS-0  [ ] FT-1  [ ] DS-1  [ ] FT-3
</TABLE>
As authorized agent of customer, I agree to the above terms and conditions:

Name: Peter Olson                Signature: /s/ PETER OLSON
      --------------------                  ---------------------
Title: CTO                       Company/Account Name: Telocity, Inc.
      --------------------                             --------------
Date: 9-13-99
      --------------------
696/02/98.1                              This form valid 2/2/98 through 8/31/98.

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.

<PAGE>   5
[MCI LOGO]

                         PRIVATE LINE SERVICE AGREEMENT

This Service Agreement (the "Agreement") for services described below is made by
and between MCI WORLDCOM Communications, Inc., formerly known as and doing
business as WorldCom Technologies, Inc. ("MCI WORLDCOM") and

Customer Name: TELOCITY, INC. (hereinafter "Customer"), with its principal
office at 10355 N. DeAnza Blvd.; Cupertino, CA 95014.

SECTION I: SERVICE AGREEMENT

1. SERVICE: MCI WORLDCOM will provide the following service (the "Service")
   pursuant to the applicable tariffs of MCI WORLDCOM and its affiliates and
   subsidiaries (the "Tariffs") (choose one):

<TABLE>
<S>                                                    <C>
          [ ] International Private Line               [ ] Digital Private Line (DS0)
          [ ] Managed International Private Line       [ ] Digital Private Line (Fractional DS1)
          [ ] Metro Private Line                       [X] DIGITAL PRIVATE LINE (DS1)
          [ ] Voice Grade Private Line                 [ ] Digital Private Line (Fractional DS3)
          [X] SONET (OC-3)                             [X] DIGITAL PRIVATE LINE (DS3)
</TABLE>

   The Tariffs provide terms and conditions of the Service which include, but
   are not limited to, taxes, pricing, discounts, credit approval procedures,
   Customer credits, termination liability, and limitations with respect to the
   assignment of the Service. The Tariffs may be modified from time to time by
   MCI WORLDCOM in accordance with law and thereby affect the Service furnished
   to Customer. In the event of a conflict between the Tariffs and this
   Agreement the terms and conditions of the Tariffs shall control.

2. EFFECTIVE DATE: For the purposes of this Agreement, (i) if Customer has an
   existing service agreement with MCI WORLDCOM, the "Effective Date" will be
   the next billing cycle following the date this Agreement has been executed
   and Customer has received a satisfactory credit review and approval from MCI
   WORLDCOM's Credit Department, and all security documentation, if any,
   required by MCI WORLDCOM has been properly executed and delivered to MCI
   WORLDCOM (collectively, the "Credit Review"); and (ii) if Customer does not
   have an existing service agreement with MCI WORLDCOM, the "Effective Date"
   will be the date this Agreement has been executed and the Credit Review has
   been completed.

3. CIRCUITS AND CONNECTIONS: Customer shall receive the following pursuant to
   this Agreement:

                      MCI WORLDCOM DOMESTIC PRIVATE LINE*
<TABLE>
<S>                      <C>
     DS-1                [*]
     DS-3 Linear         [*]
     DS-3 Restorable     [*]
     OC-3 Linear         [*]
     OC-3 Restorable     [*]
</TABLE>

*Rates will apply to Inter-exchange Carrier (IXC) charges only
*Rates will apply to Tier A cities only (all other are ICB)
*Local access is additional and non-discountable.

                           MCI WORLDCOM LOCAL ACCESS
<TABLE>
<CAPTION>
     SERVICE        TYPE(1)        MILE(2)        PRICING
<S>                 <C>            <C>            <C>
      DS-3            1            0 mile         [*]
      DS-3            1            1 mile         [*]
</TABLE>

(1) Type I sites consist of sites which are provisioned entirely on MCI
    WORLDCOM's local network.

(2) Each additional mile is [*] per mile

4. REVENUE COMMITMENT: Customer agrees to the following minimum monthly revenue
   commitment ("mrc") of [*] Forty-Five (45)-month term with a (9) month ramp
   and shall receive the associated rates as set forth in Section 3 above, and
   in the applicable tariffs.

5. MONTHLY-UNDERUTILIZATION: If Customer's usage fails to meet the MRC,
Customer will pay [*] of the difference between Customer's usage during each
month and Customer's MRC. Monthly usage in excess of the MRC cannot be carried
forward to another month.

                                  Page 1 of 2

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.
<PAGE>   6
[MCI WORLDCOM LOGO]

6.  LETTER OF AGENCY ("LOA"): The undersigned hereby authorizes MCI WORLDCOM
    and/or the Local Exchange Company ("LEC"), and/or Foreign Telecommunications
    Provider ("FTP"), if requested by Customer, to provision Customer's Local
    Access. This LOA supersedes all previous LOAs and shall remain in effect
    until canceled by Customer in writing.

7.  COMPLETE AGREEMENT: This Agreement, including the MCI WORLDCOM Application
    for Credit, the Tariffs and any documents incorporated herein by reference,
    constitutes the full understanding of the parties and supersedes any prior
    agreements between the parties relating to the Service. Alterations to this
    Agreement shall render this Agreement null and void. Customer acknowledges
    that MCI WORLDCOM is under no duty, implied or otherwise, to activate the
    Service and will not be subject to liability, if any, under the terms of
    this Agreement until such Service is activated.

8.  SIGNATURE AUTHORIZATION: The parties have duly executed and agreed to be
    bound by this Agreement as evidenced by the signatures of their authorized
    representatives below. Each party represents and warrants to the other that
    the signatory identified beneath its name below has full authority to
    execute this Agreement on its behalf.

ACCEPTED BY:                            ACCEPTED BY:
TELOCITY, INC.                          MCI WORLDCOM COMMUNICATIONS, INC.

By: /s/ PETER OLSON                     By:
   ---------------------------             ---------------------------------

Name: Peter Olson                       Name: Frank Grillo
   ---------------------------             ---------------------------------

Title:  CTO                             Title: V.P. Marketing
   ---------------------------             ---------------------------------

Date:  9/13/99                          Date:
   ---------------------------             ---------------------------------

                                  Page 2 of 2

<PAGE>   7
[WORLDCOM LOGO]      WORLDCOM MAE(R) ATM SERVICE AGREEMENT

This Service Agreement (the "Agreement") is made by and between WorldCom
Technologies, Inc. ("WorldCom"), located at 515 East Amite, Jackson,
Mississippi 39201-2702, and Telocity ("Customer"), with its principal office at
10355 N. Deanza Blvd., Cupertino, CA 95014, for services described below.

1. SERVICE: WorldCom will provide Customer MAE ATM service consisting of: (i) a
port connection, i.e., access to the WorldCom MAE switching equipment and the
connection of the port to either the local access facilities or to the
Customer's equipment, the permanent virtual circuits or other virtual data
paths assigned to said port, if desired ("MAE Connections") and (ii)
maintenance of the equipment and services provided by WorldCom (collectively
"Service"). The Service is subject to the terms and conditions contained here
and the WorldCom Commercial Application for Credit.

2. TERM: The Term of this Agreement shall be [ ] 1 Year [ ] 2 Years [X] 3 Years
("Term"). Upon expiration of the Term, unless either party gives written notice
to the other party thirty (30) days prior to the end of the Term, the Term will
continue on a month-to-month basis until this Agreement is terminated by either
party on at least thirty (30) days prior written notice to the other party.
Customer shall be liable for all charges associated with actual usage of the
Services during the Term and any extension thereof.

3. EFFECTIVE DATE: For the purposes of this Agreement, (i) if Customer has an
existing service agreement with WorldCom, the "Effective Date" will be the next
billing cycle following the date this Agreement has been fully executed by both
parties and Customer has received a satisfactory credit review and approval
from WorldCom's Credit Department, and all security documentation, if any,
required by WorldCom has been properly executed and delivered to WorldCom
(collectively, the "Credit Review"), and (ii) if Customer does not have an
existing service agreement with WorldCom, the "Effective Date" will be the date
this Agreement has been fully executed by both parties and the Credit Review
has been completed.

4. SERVICE RATES: (Check desired port)

<TABLE>
<CAPTION>

                                   MONTHLY RECURRING        START-UP
SERVICE                                 CHARGE               CHARGE
<S>                                <C>                      <C>

[ ] 45 Mbps ATM port                    [*]                  [*]
[X] 155 Mbps ATM port                   [*]                  [*]
[ ] 622 Mbps ATM port                   [*]                  [*]

ANCILLARY CHARGES

Permanent Virtual Circuit (PVC) moves, adds or changes                $ [*]/PVC
(Charge does not apply to PVCs setup at time of initial
port installation)

Non-Administrative Order Charge/Port
     Pre-engineering                                                  [*]
     Post-engineering                                                 [*]
</TABLE>

Customer purchasing CPE from WorldCom under separate agreement (check
applicable box): [ ] Yes  [X] No

TERM AND VOLUME DISCOUNTS: The following discount schedule applies to the
Monthly Recurring Charge for MAE ATM ports only, as shown in Section 4.

<TABLE>
<CAPTION>

                                                  TERM
                                   ------------------------------------
TOTAL MONTHLY SERVICE CHARGES*     1 YEAR         2 Year         3 Year
<S>                                <C>            <C>            <C>

             $0                     [*]            [*]            [*]
           $2,500                   [*]            [*]            [*]
           $5,000                   [*]            [*]            [*]
           $7,500                   [*]            [*]            [*]
          $10,000                   [*]            [*]            [*]
          $15,000                   [*]            [*]            [*]
          $20,000                   [*]            [*]            [*]
          $30,000                   [*]            [*]            [*]
          $40,000                   [*]            [*]            [*]
          $50,000                   [*]            [*]            [*]
</TABLE>

*Charges set forth in Section 4 of this Agreement excluding local access
monthly recurring and/or installation fees, collocation fees or additional
customer premises equipment costs. Customer shall be responsible for all such
charges associated with the service

258/08/98.3

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.

<PAGE>   8
5. PAYMENT BILLING:

      A.    Payment is due 30 days after date of invoice. Accounts are in
            default if payment is not received within such 30-day period.
            Accounts unpaid 60 days after date of invoice may have their service
            disconnected without further notice to Customer.

            Such disconnection does not relieve Customer from the obligation to
            pay the monthly charge and any applicable cancellation charges. Only
            a written request to terminate Customer's service relieves Customer
            of Customer's obligation to pay the monthly account charge. Accounts
            in default are subject to an interest charge of 1.5% per month on
            the outstanding balance. If Customer's state law does not allow an
            interest rate of 1.5% per month, the maximum allowable rate for
            Customer's state will be charged. Customer agrees to pay WorldCom
            its reasonable expenses, including attorney and collection agency
            fees, incurred in enforcing its rights under this Agreement.

      B.    Billing for Service will commence when the connection from the MAE
            facility is completed to Customer's site or collocation space and IP
            packets can be passed. Service is invoiced monthly in advance.

6. CANCELLATION CHARGE:

      A.    After this Agreement is accepted by WorldCom, Customer may cancel
            all or a portion of the Service if Customer provides written
            notification thereof to WorldCom thirty (30) days in advance of the
            effective date of cancellation. In such case, Customer shall pay to
            WorldCom all charges for Service described herein provided through
            the effective date of such cancellation plus a cancellation charge
            determined as follows: (i) if the Term is one (1) year or less, then
            the cancellation charge shall be an amount equal to the balance of
            the monthly recurring charges (then in effect at the time of
            cancellation) for such canceled Service that otherwise would have
            become due for the unexpired balance of the Term (but in no event
            less than zero); (ii) if the Term is longer than one (1) year and
            such cancellation becomes effective prior to completion of the first
            year of the Term, then the cancellation charge shall be an amount
            equal to the balance of the monthly recurring charges (then in
            effect at the time of cancellation) for such canceled Service that
            otherwise would have become due for the unexpired portion of the
            first year of the Term plus eighty-five percent (85%) of the balance
            of such monthly recurring charges for the remainder of the Term
            beyond the first year; and, (iii) if the Term for the canceled
            Service is longer than one (1) year and such cancellation becomes
            effective after completion of the first year of the Term, then the
            cancellation charge shall be an amount equal to seventy-five percent
            (75%) of the balance of the monthly recurring charges (then in
            effect at the time of cancellation) for such canceled Service that
            otherwise would have become due for the unexpired portion of the
            Term. It is agreed that WorldCom's damages in the event Customer
            cancels Service shall be difficult or impossible to ascertain. The
            aforementioned provision for a cancellation charge is intended to
            establish liquidated damages in the event of a cancellation and is
            not intended as a penalty.

      B.    Service Credits: If Customer notifies WorldCom immediately upon
            failure to access Service and WorldCom determines in its reasonable
            commercial judgment that Service is unavailable to Customer, the
            following will apply: (i) if WorldCom determines that Service is
            unavailable for one (1) or more (but fewer than four) consecutive
            hours during such calendar month, WorldCom, upon Customer's request,
            will credit Customer's account for such month the pro-rated charges
            equal to one (1) day's service, (ii) if WorldCom determines that
            Service is unavailable for four (4) or more hours during such
            calendar month, WorldCom, upon Customer's request, will credit
            Customer's account for such month for the pro-rated charges equal to
            one (1) week's service. This paragraph states WorldCom's sole
            obligation and Customer's exclusive remedy for any unavailability of
            Service. The remedies set forth in this paragraph shall not apply if
            unavailability of Service is due to scheduled maintenance,
            Customer's equipment, Customer access connections, network
            unavailability outside of Service or events of force majeure.
            Credits will not apply to charges for local access or any charges
            for services other than the Service as described in paragraph (i)
            above. Customers with multiple connections to a failed MAE ATM
            facility will not receive credits pursuant to this paragraph if at
            least one connection continues with Service available. Customer's
            account shall not be credited more than once per month pursuant to
            this paragraph.

7. CUSTOMER'S RESPONSIBILITIES:

      A.    Fraudulent Transactions: In the event WorldCom discovers fraudulent
            use of Service (or reasonably believes such fraudulent use exists),
            nothing contained herein shall prohibit WorldCom from taking
            immediate action (without notice to Customer) that is reasonably
            necessary to prevent such fraudulent use of Service from taking
            place, including without limitation, denying or terminating Service
            to and from specific locations.

      B.    Preparation: WorldCom is not responsible for the installation,
            maintenance, compatibility or performance of any equipment or
            software not provided by WorldCom, and Customer shall indemnify
            WorldCom and its affiliates against any infringement claims arising
            out of the use of such third party equipment or software in
            connection with the Service. If such third party equipment or
            software impairs Service, Customer shall remain liable for payment,
            and if such third party equipment is likely to cause hazard or
            service obstruction, Customer shall eliminate such likelihood at
            WorldCom's request.
<PAGE>   9
    C.  Use of Products and Services: Customer shall not, nor shall it permit or
        assist others including Customer's end users and customers to: (i) use
        the Service for any purpose other than that for which it is intended or
        use the Service in violation of any applicable law or regulation or in
        aid of any unlawful act including any use that is harassing, or which
        infringes on another's intellectual property rights, copyrighted
        material, material legally judged to be threatening or obscene, or
        material protected by trade secret, or which otherwise constitutes
        Service abuse, and Customer shall be responsible for any such misuse of
        the Service, (ii) use Service so as to interfere with the use of the MAE
        facility or any other network or the use of any Service by other
        customers or authorized users, (iii) use the Service to access, alter,
        destroy or attempt to access, alter or destroy any information of
        another WorldCom customer, (iv) fail to maintain a suitable environment
        specified by WorldCom, or (v) alter, tamper with, adjust or repair the
        Service. Upon the occurrence of any of the above, WorldCom shall be
        completely released from any liability or obligation to Customer
        relative to the Service and this Agreement, and Customer shall be liable
        to WorldCom for costs or damages incurred by WorldCom resulting
        therefrom. Customer shall indemnify and hold WorldCom harmless against
        any liabilities losses, demands, liabilities, suits or actions including
        any claims resulting from Customer's use of Service, or use of the
        Service by its customers or others throughout Customer's chain of
        distribution, including end users, which damages WorldCom or a third
        party. Customer shall be responsible for communicating with Customer's
        own users of the Service, and for handling all complaints and trouble
        reports made by such users. Customer must comply with reasonable
        security procedures and standards with respect to Customer's own routers
        or switch equipment that interface with Service. WorldCom may (but is
        under no obligation to) communicate security issues to Customer from
        time to time when abuse or misuse is observed or reported by others.
        Customer shall be responsible for compliance with rules governing the
        networks of other WorldCom MAE Service customers which may include
        executing interconnection agreements with such other WorldCom MAE
        Service customers. Customer shall indemnify, defend and hold WorldCom
        harmless, from and against any and all losses, claims, demands,
        liabilities, suits or actions by any WorldCom MAE Service customers to
        the extent such claim, demand, liability, suit or action relates to
        Customers obligations contained herein.

    D.  Customer equipment: Customer agrees to connect only WorldCom certified
        equipment to the MAE ATM switch equipment. This applies whether the
        Service is terminated at collocation space within WorldCom facilities or
        the service is terminated at Customer's premises by use of WorldCom's or
        any other carriers' local access circuits.

    E.  Maintenance: WorldCom reserves the right to perform scheduled and
        emergency maintenance on the MAE facilities and any other equipment used
        to provide the Service. In the case of scheduled maintenance, WorldCom
        agrees to give Customer prior notice of the maintenance outage. In the
        case of emergency maintenance, WorldCom agrees to use its best efforts
        to notify Customer prior to such maintenance outage.

    F.  Peering: WorldCom does not undertake to secure a commercial agreement
        and technical implementation between two Internet service providers to
        exchange Internet traffic between their two networks ("Peering") for
        the Customer. Connection to a MAE does not indicate that Customer will
        be able to transmit traffic to or receive traffic from any other Service
        customer connected to a MAE. WorldCom in no way guarantees Customer that
        any other customer connected to a MAE will remain connected. Before
        WorldCom will provide Customer with Service, Customer must provide
        WorldCom with a copy of a bona fide Peering agreement between Customer
        and a WorldCom MAE Customer.

8.  MODIFICATION OF SERVICES: WorldCom reserves the right to eliminate Service
    offerings and/or modify charges for Service offerings (which charge
    modifications shall not exceed then current generally available WorldCom
    charges for comparable services), upon not less than thirty (30) days prior
    notice to Customer, which notice will state the effective date for the
    charge modifications. In the event WorldCom notifies Customer of the
    elimination of a Service offering and/or an increase in the charge,
    Customer may terminate the affected Service without incurring a
    cancellation charge. In order to cancel that offering, Customer must notify
    WorldCom, in writing, at least fifteen (15) days prior to the effective
    date of the increase in charges.

9.  WARRANTY; DISCLAIMER OF WARRANTIES; LIMITED LIABILITY: CUSTOMER ASSUMES
    TOTAL RESPONSIBILITY FOR CUSTOMER AND CUSTOMER USER'S USE OF THE SERVICES.
    WORLDCOM MAKES NO EXPRESS OR IMPLIED WARRANTIES, REPRESENTATIONS OR
    ENDORSEMENTS REGARDING ANY MERCHANDISE, INFORMATION, PRODUCTS OR SERVICES
    PROVIDED THROUGH THE INTERNET. THE SERVICE IS PROVIDED ON AN "AS IS" AND
    "AS AVAILABLE" BASIS WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR IMPLIED,
    INCLUDING BUT NOT LIMITED TO WARRANTIES OF TITLE, NONINFRINGEMENT OR
    IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
    NO ADVICE OR INFORMATION GIVEN BY WORLDCOM'S EMPLOYEES, AGENTS OR
    CONTRACTORS SHALL CREATE A WARRANTY. UNDER NO CIRCUMSTANCES SHALL WORLDCOM
    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, PUNITIVE OR
    CONSEQUENTIAL DAMAGES THAT RESULT FROM CUSTOMER OR CUSTOMER USERS' USE OF
    OR INABILITY TO ACCESS ANY PART OF THE INTERNET OR CUSTOMER OR CUSTOMER
    USERS' RELIANCE ON OR USE OF INFORMATION, SERVICES OR MERCHANDISE PROVIDED
    ON OR THROUGH THE SERVICE, OR THAT RESULT FROM
<PAGE>   10
     MISTAKES, OMISSIONS, INTERRUPTIONS, DELETION OF FILES, ERRORS, DEFECTS,
     DELAYS IN OPERATION, OR TRANSMISSION, OR ANY FAILURE OF PERFORMANCE. If
     Customer is dissatisfied with the Service, excluding the remedies set
     forth in 8(B), Customer's sole exclusive remedy is to terminate this
     Agreement.

10.  INDEMNIFICATION: Customer agrees to indemnify, hold harmless, and defend
     WoldCom, its respective directors, officers, agents, employees and/or
     representatives from and against any and all claims, demands, causes of
     action, losses, expenses or liabilities, including reasonable attorney's
     fees, on account of injury or death of any person or loss of or damage to
     any and all property arising, directly or indirectly, out of the acts or
     omissions of Customer, any subcontractor, director, officer, agent,
     employee and/or representative of each of them, in the performance of any
     work under this Agreement, except to the extent such cause of action,
     loss, expense or liability is caused solely by the gross negligence of
     WorldCom.

11.  NOTICES: Notices under this Agreement shall be in writing and delivered to
     the person identified below at the offices of the parties as they appear
     below, or as otherwise provided for, by proper notice hereunder. Notices
     will be effective and deemed delivered (i) three (3) business days after
     posting with the United States Postal Service ("U.S. Mail") when mailed by
     certified mail, return receipt requested; (ii) one (1) business day after
     pick-up by a courier service when sent by overnight courier; or (iii) one
     (1) business day after the date of the sender's electronic confirmation of
     receipt when sent by facsimile transmission. The party sending a notice by
     U.S. Mail or overnight courier will bear the postage charges required for
     the selected delivery method. Parties to receive notices are:

           IF TO WORLDCOM:                          IF TO CUSTOMER:

Director of Marketing                   Director, Legal Affairs
-------------------------------------   ----------------------------------------
(NAME - PARTY TO RECEIVE NOTICES)       (NAME - PARTY TO RECEIVE NOTICES)

Address (not P.O. Box address):         Address (not P.O. Box address):

515 East Amite                          10355 N. De Anza Blvd.
-------------------------------------   ----------------------------------------

Fourth Floor
-------------------------------------   ----------------------------------------

Jackson, MS 39201-2702
-------------------------------------   ----------------------------------------

Phone No.: 601-974-8425                 Phone No.: 408-863-6602
           --------------------------              -----------------------------

Fax No.: 601-974-8450                   Fax No.: 408-777-1451
         ----------------------------            -------------------------------

12.  USE OF SERVICE: The provision of Service will not create a partnership or
     joint venture between the parties or result in a joint communications
     service offering to any third parties. Only upon express written consent
     shall Customer be permitted to use WorldCom's name, trademarks, tradename,
     service marks or any other intangible property owned by WorldCom for the
     promotion of Customer's use of the Service.

13.  GENERAL: Customer may not assign this Agreement. Customer may not
     subcontract with other persons or entities to undertake any of Customer's
     obligations that are set forth in this Agreement. Any legal action arising
     out of this Agreement must be brought within one (1) year.

14.  SURVIVAL OF TERMS: The terms and provisions contained in this Agreement
     that by their sense and content are intended to survive the performance
     thereof by the parties hereto shall so survive the completion of
     performance and termination of this Agreement, including, without
     limitation, provisions for indemnification and the making of any and all
     payments due hereunder.

     C.   ENTIRE AGREEMENT: This Agreement, including any documents incorporated
          herein by reference, and the WorldCom Commercial Application for
          Credit, constitutes the full understanding of the parties and
          supersedes any and all previous representations, understandings or
          agreements between the parties and shall prevail notwithstanding any
          variance with terms and conditions of any order submitted.
<PAGE>   11
This Agreement is subject to the Credit Application forms executed in
connection with the services provided herein and sets forth the entire
Agreement and understanding of the parties relating to the subject matter
covered, and supersedes and cancels all prior agreements between Customer and
WorldCom relating to MAE services. Limitations may apply to combining the Term
discount with other special offers. Modifications to the standard terms and
conditions contained in this Agreement are not permitted and shall not be
valid. Activation of Service shall indicate WorldCom's acceptance of this
Agreement Customer acknowledges that WorldCom is under no duty, implied or
otherwise, to activate the Service and will not be subject to liability, if
any, under the terms of this Agreement until such Service is activated. As
authorized agent of Customer, I agree to the above terms and conditions of this
Agreement.

Name: PETER OLSON
      ---------------------------------------------------------------
Company/Account Name: TELOCITY, INC.
                      -----------------------------------------------
Signature: /s/ PETER D. OLSON
           ----------------------------------------------------------
Title: C.T.O.
       --------------------------------------------------------------
Date: 8/23/99
      ------------------------
<PAGE>   12
[WORLDCOM LOGO]                                      CUSTOMER SERVICE ORDER FORM

<TABLE>
<CAPTION>
ORDER

<S>                     <C>                                 <C>                    <C>
   Billed Company Name: Telocity, Inc.                      Customer Desired Date: 10/30/1999
          Service Type: SONET oc3 point-to-point                 Related Order Id:
              Quantity: 1                                           Contract Term: 01
              Order Id: I11267                                      Contract Unit: year
             Initiator: Andrew Robinson                           Billing Address: 10355 N De Anza Blvd. 1st Fl
Initiator Company Name: Telocity, Inc.                                             Cupertino, CA 95014-2027
       Initiator Phone: (408) 863-5656
         Initiator Fax: (408) 777-1451

</TABLE>

<TABLE>
<CAPTION>
LOCATION 1                                                  LOCATION 2

<S>                       <C>                                 <C>                      <C>
                 Address: 10355 N De Anza Blvd                                Address: 55 S Market St
                          Cupertino, CA 95014-2027                                     San Jose, CA 95113-2324

                 Company: Telocity                                            Company: Mae West
                   Floor: 1st     Room: telco                                   Floor: 10      Room: colo 3
        Customer Circuit:                                            Customer Circuit:
             Customer PO:                                                 Customer PO:
      Technical Contract: Andrew Robinson                           Technical Contact: Dan Schafer (7480)
 Technical Contact Phone: (408) 863-6656                      Technical Contact Phone: (415) 395-7480

</TABLE>

<TABLE>
<CAPTION>
DS-0
<S>                                <C>                      <C>
DS0 Service Type:

DS-1                               DS-3                     EQUIPMENT
Line Coding:                       Framed:                  Equipment Type:
    Framing:

</TABLE>

OTHER SERVICES

     Description; optical

REMARKS

     1. please note that location 1 will be added to the network, thus, we
     2. will NOT need a type2 circuit.
     3.

SERVICE CHARGES

<TABLE>
<CAPTION>
                         MONTHLY RECURRING CHARGES                    NON-RECURRING CHARGES
<S>                      <C>            <C>                           <C>             <C>
                         Unit $         Total $                       Unit $          Total $
 Facility Charge:        [*]             [*]                            [*]             [*]
Equipment Charge:        [*]             [*]                            [*]             [*]
   Total Charges:                        [*]                                            [*]

</TABLE>

Customer Approval /s/ PETER OLSON
                 ---------------------------------------------------------------
                 SIGNATURE                              TITLE               DATE

Services which are under the jurisdiction of the Federal Communication (F.C.C.)
will be provided subject to the terms and conditions of applicable Worldcom,
Inc. tariffs on file with the F.C.C.. Services subject to state jurisdiction
will be rendered according to terms and conditions set forth in WorldCom, Inc.
tariffs filed with the applicable regulatory agency of the state in which the
service is provided. All relevant tariff provisions are incorporated by
reference in any customer service order. Tariffs are available for inspection
from the F.C.C. or the state regulatory agency, as appropriate or from
WorldCom, Inc.

                         FOR WORLDCOM INTERNAL USE ONLY
SIGNATURE                            TITLE                                  DATE

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.

<PAGE>   13
                  [WORLDCOM LOGO] CUSTOMER SERVICE ORDER FORM

ORDER
<TABLE>
<S>                                                        <C>
    Billed Company Name: Telocity, Inc.                       Customer Desired Date: 10/30/1999
           Service Type: SONET oc3 point-to-point                  Related Order Id:
               Quantity: 1                                            Contract Term: 01
               Order Id: I11267                                       Contract Unit: year
              Initiator: Andrew Robinson                            Billing Address: 10355 N De Anza Blvd 1st Fl
 Initiator Company Name: Telocity, Inc.                                              Cupertino, CA 95014-2027
        Initiator Phone: (408) 863-6656
          Initiator Fax: (408) 777-1451

LOCATION 1                                                  LOCATION 2

                Address: 10355 N De Anza Blvd                               Address: 55 S Market St
                         Cupertino, CA 95014-2027                                    San Jose, CA 95113-2324

                Company: Telocity                                           Company: Mae West
                  Floor: 1st      Room: telco                                 Floor: 10     Room: colo 3
       Customer Circuit:                                           Customer Circuit:
            Customer PO:                                                Customer PO:
      Technical Contact: andrew robinson                          Technical Contact: Dan Schafer (7480)
Technical Contact Phone: (408) 863-6656                     Technical Contact Phone: (415) 395-7480

     DS-0
     DS0 Service Type:

     DS-1                               DS-3                                         EQUIPMENT

  Line Coding:                      Framed:                                     Equipment Type:
      Framing:

     OTHER SERVICES

       Description: optical
</TABLE>
     REMARKS:

        1:   please note that location 1 will be added to the network, thus, we
        2:   will NOT need a type2 circuit.
        3:

     SERVICE CHARGES
<TABLE>
<CAPTION>
                         Monthly Recurring Charges               Non-Recurring Charges
                           Unit $        Total $                  Unit $      Total $
                         --------       --------                 --------     --------
<S>                      <C>            <C>                      <C>          <C>
 Facility Charge:        [*]               [*]                   [*]             [*]

Equipment Charge:        [*]               [*]                   [*]             [*]

   Total Charges:                          [*]                                   [*]
</TABLE>

Customer Approval  /s/ PETER OLSON
                  --------------------------------------------------------------
                  SIGNATURE                      TITLE                  DATE

Services which are under the jurisdiction of the Federal Communication (F.C.C.)
will be provided subject to the terms and conditions of applicable WorldCom,
Inc. tariffs on file with the F.C.C. Services subject to state jurisdiction will
be rendered according to terms and conditions set forth in WorldCom, Inc.
tariffs filed with the applicable regulatory agency of the state in which the
service is provided. All relevant tariff provisions are incorporated by
reference in any customer service order. Tariffs are available for inspection
from the F.C.C. or the state regulatory agency, as appropriate or from
WorldCom, Inc.

                         FOR WORLDCOM INTERNAL USE ONLY

                  SIGNATURE                      TITLE                  DATE

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.
<PAGE>   14
                  [WORLDCOM LOGO] CUSTOMER SERVICE ORDER FORM

ORDER
<TABLE>
<S>                                                        <C>
    Billed Company Name: Telocity, Inc.                       Customer Desired Date: 10/29/1999
           Service Type: SONET oc3 point-to-point                  Related Order Id:
               Quantity: 1                                            Contract Term: 03
               Order Id: I24283                                       Contract Unit: years
              Initiator: Andrew Robinson                            Billing Address: 10355 N De Anza Blvd 1st Fl
 Initiator Company Name: Telocity, Inc.                                              Cupertino, CA 95014-2027
        Initiator Phone: (408) 863-6656
          Initiator Fax: (408) 777-1451

LOCATION 1                                                  LOCATION 2

                Address: 1919 Gallows Rd.                                   Address: 1755 Old Meadow Rd
                         Vienna, VA 22182-3964                                       McLean, VA 22102-4301

                Company: MFS MAE EAST                                       Company: Level 3 Communications
                  Floor: P1       Room: colo                                  Floor: 1             Room:
       Customer Circuit:                                           Customer Circuit:
            Customer PO:                                                Customer PO:
      Technical Contact: John Milne (2017)                        Technical Contact: Annette Martin
Technical Contact Phone: (703) 506-2017                     Technical Contact Phone: (800) 373-2499

     DS-0
     DS0 Service Type:

     DS-1                               DS-3                                         EQUIPMENT

  Line Coding:                      Framed:                                     Equipment Type:
      Framing:

     OTHER SERVICES

       Description: optical
</TABLE>
     REMARKS:

        1:   this is a new oc-3c between the level3 collocation site at loc2 and
        2:   MAE East at loc1.
        3:

     SERVICE CHARGES
<TABLE>
<CAPTION>
                         Monthly Recurring Charges               Non-Recurring Charges
                           Unit $        Total $                  Unit $      Total $
                         --------       --------                 --------     --------
<S>                      <C>            <C>                      <C>          <C>
 Facility Charge:             [*]            [*]                      [*]          [*]

Equipment Charge:             [*]            [*]                      [*]          [*]

   Total Charges:                            [*]                                   [*]
</TABLE>

Customer Approval  /s/ PETER OLSON
                  --------------------------------------------------------------
                  SIGNATURE                      TITLE                  DATE

Services which are under the jurisdiction of the Federal Communication (F.C.C.)
will be provided subject to the terms and conditions of applicable WorldCom,
Inc. tariffs on file with the F.C.C. Services subject to state jurisdiction will
be rendered according to terms and conditions set forth in WorldCom, Inc.
tariffs filed with the applicable regulatory agency of the state in which the
service is provided. All relevant tariff provisions are incorporated by
reference in any customer service order. Tariffs are available for inspection
from the F.C.C. or the state regulatory agency, as appropriate or from
WorldCom, Inc.

                         FOR WORLDCOM INTERNAL USE ONLY

                  SIGNATURE                      TITLE                  DATE

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.
<PAGE>   15
                  [WORLDCOM LOGO] CUSTOMER SERVICE ORDER FORM

ORDER
<TABLE>
<S>                                                        <C>
    Billed Company Name: Telocity, Inc.                       Customer Desired Date: 10/29/1999
           Service Type: SONET oc3 point-to-point                  Related Order Id:
               Quantity: 1                                            Contract Term: 03
               Order Id: I24283                                       Contract Unit: years
              Initiator: Andrew Robinson                            Billing Address: 10355 N De Anza Blvd 1st Fl
 Initiator Company Name: Telocity, Inc.                                              Cupertino, CA 95014-2027
        Initiator Phone: (408) 863-6656
          Initiator Fax: (408) 777-1451

LOCATION 1                                                  LOCATION 2

                Address: 1919 Gallows Rd.                                   Address: 1755 Old Meadow Rd
                         Vienna, VA 22182-3964                                       McLean, VA 22102-4301

                Company: MFS MAE EAST                                       Company: Level 3 Communications
                  Floor: P1       Room: colo                                  Floor: 1             Room:
       Customer Circuit:                                           Customer Circuit:
            Customer PO:                                                Customer PO:
      Technical Contact: John Milne (2017)                        Technical Contact: Annette Martin
Technical Contact Phone: (703) 506-2017                     Technical Contact Phone: (800) 373-2499

     DS-0
     DS0 Service Type:

     DS-1                               DS-3                                         EQUIPMENT

  Line Coding:                      Framed:                                     Equipment Type:
      Framing:

     OTHER SERVICES

       Description: optical
</TABLE>
     REMARKS:

        1:   this is a new oc-3c between the level3 collocation site at loc2 and
        2:   MAE East at loc1.
        3:

     SERVICE CHARGES
<TABLE>
<CAPTION>
                         Monthly Recurring Charges               Non-Recurring Charges
                           Unit $        Total $                  Unit $      Total $
                         --------       --------                 --------     --------
<S>                      <C>            <C>                      <C>          <C>
 Facility Charge:             [*]            [*]                      [*]          [*]

Equipment Charge:             [*]            [*]                      [*]          [*]

   Total Charges:                            [*]                                   [*]
</TABLE>

Customer Approval  /s/ PETER OLSON
                  --------------------------------------------------------------
                  SIGNATURE                      TITLE                  DATE

Services which are under the jurisdiction of the Federal Communication (F.C.C.)
will be provided subject to the terms and conditions of applicable Worldcom,
Inc. tariffs on file with the F.C.C. Services subject to state jurisdiction will
be rendered according to terms and conditions set forth in WorldCom, Inc.
tariffs filed with the applicable regulatory agency of the state in which the
service is provided. All relevant tariff provisions are incorporated by
reference in any customer service order. Tariffs are available for inspection
from the F.C.C. or the state regulatory agency, as appropriate or from
WorldCom, Inc.

                             FOR WORLDCOM USE ONLY

                  SIGNATURE                      TITLE                  DATE

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.
<PAGE>   16

DIRECTIONS: Fill in information with SHADED AREAS                    TELOCITY
                                                                       LOGO
Vendor: MCI/Worldcom

Telcom Sales

201 Spear Street, 5th Floor, SF, CA 94105

Phone: 415-228-1439
Fax:   415-228-1309

              Purchase
            Request Form

For purchasing department use only:
PO#     CO#     RLS#    CDO:  Y  N
Acct Distribution:

--------------------------------------------------------------------------------
Date Confirmed           Vendor Contact           Required Delivery Date

--------------------------------------------------------------------------------
DATE OF REQUEST       IN CURRENT YEAR'S PLAN?          Requisition #
    8/20/99                    YES                         N/A
--------------------------------------------------------------------------------
REASON FOR PURCHASE (BUSINESS JUSTIFICATION):
MAE - East, MAE - West, Ports & Colo      3 Year Contract
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
Ship Via        F.O.B. Point        Destination         Terms          Taxable

--------------------------------------------------------------------------------
 In-Plant        DEPARTMENT                  Project #                 Buyer
Destination        Network                      N/A                Sonia Colgan
--------------------------------------------------------------------------------
                Special Instructions (If any)

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

--------------------------------------------------------------------------------
           QUANTITY        Vendor        Telocity
 Item     REQUESTED      Part Number    Part Number            DESCRIPTION
--------------------------------------------------------------------------------
  1           1                                         Mae East Port Install
--------------------------------------------------------------------------------
  2           1                                         Mae East Port Monthly
--------------------------------------------------------------------------------
  3           1                                         Mae East Colo
--------------------------------------------------------------------------------
  4           1                                         Mae West Port Install
--------------------------------------------------------------------------------
  5           1                                         Mae West Port Monthly
--------------------------------------------------------------------------------
  6           1                                         Mae West Colo
--------------------------------------------------------------------------------
  7
--------------------------------------------------------------------------------
  8
--------------------------------------------------------------------------------
  9
--------------------------------------------------------------------------------
  10
--------------------------------------------------------------------------------
  11
--------------------------------------------------------------------------------
  12
--------------------------------------------------------------------------------

--------------------------------------------------------
Suggested Unit       Actual Unit
    Price               Price          Extended Amount
--------------------------------------------------------
        [*]                 [*]                [*]
--------------------------------------------------------
        [*]                 [*]                [*]
--------------------------------------------------------
                            [*]                [*]
--------------------------------------------------------
        [*]                 [*]                [*]
--------------------------------------------------------
        [*]                 [*]                [*]
--------------------------------------------------------
                            [*]                [*]
--------------------------------------------------------

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

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

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

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

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

--------------------------------------------------------
TOTAL VALUE OF PURCHASE REQUEST                [*]
--------------------------------------------------------

Andrew Robinson
------------------------    ---------------------------
REQUESTER - PRINT OR TYPE   APPROVAL #1 - PRINT OR TYPE

---------------------------
Approval #2 - Print or Type

SIGNATURES:    /s/ Andrew Robinson
               ------------------------    ---------------------------
               REQUESTER - SIGNATURE       APPROVAL #1 - SIGNATURE

/s/ PETER OLSON
---------------------------
Approval #2 (if necessary)

[*] The Registrant has requested confidential treatment for certain portions of
this exhibit. The omitted portions have been separately filed with the
Commission.<PAGE>   1
                                                                   EXHIBIT 10.28

                        NBCi/TELOCITY OPERATING AGREEMENT

        This Operating Agreement (the "Agreement") is made and entered into as
of December 10, 1999 (the "Effective Date") between NBC Internet, Inc., a
Delaware corporation, with its principal place of business at 225 Bush Street,
San Francisco, California 94104 ("NBCi") and Telocity, Inc., a California
corporation, with its principal place of business at 10355 N. De Anza Boulevard,
Cupertino, California 95014-2027 ("Telocity"). Subject to the provisions of
Section 20.7, Telocity acknowledges that NBCi will fulfill its obligations under
this Agreement itself and through various of its subsidiaries, including Snap!
L.L.C. ("Snap"), a Delaware limited liability company and Xoom.com, Inc.
("Xoom"), a Delaware corporation. The parties hereby agree as follows:

1.      Background.

        1.1.    Telocity is an emerging provider of branded, broadband services,
                currently and primarily provided through DSL, targeted
                specifically at the residential market space. Telocity will
                provide the next-generation of broadband services to consumers
                by deploying the first open, end-to-end platform for delivering
                digital services to, and throughout, the home.

        1.2.    NBCi and/or its subsidiaries operate a search and aggregation
                "portal" site on the Web and a direct marketing site on the Web.

        1.3.    Concurrently with this Agreement, Telocity, NBCi, NBC and others
                have entered into a Series C Preferred Stock Purchase Agreement
                dated December 10, 1999 ("Stock Purchase Agreement").

        1.4.    Concurrently with this Agreement, Telocity and NBC have entered
                into a Letter Agreement dated December 10, 1999 ("Letter
                Agreement") whereby NBC will provide Telocity with certain
                television advertising services.

        1.5.    Concurrently with this Agreement, Telocity and NBCi have entered
                into a Letter Agreement dated December 10, 1999 ("Letter
                Agreement") whereby NBCi will provide Telocity with certain
                television advertising services.

2.      Certain Definitions. As used in this Agreement, the terms set forth
        below shall have the following meanings:

        2.1.    "Above the Fold" means that a particular item on a Web page is
                viewable on a computer screen at an 800 x 600 pixels resolution
                when the User first accesses such Web page, without scrolling
                down to view more of the Web page.

        2.2.    "Additional Interfaces" shall have the meaning set forth in
                Section 4.4.

        2.3.    "Affiliate" means as to any Person, (i) any other Person that
                directly or indirectly controls, owns, is controlled or owned
                by, or is under common control or ownership with such first
                Person, (ii) any subsidiary of such first Person, and (iii) any
                subsidiary of any subsidiary of such first Person. A Person
                shall be

                                       1
<PAGE>   2

                deemed to control another Person if such Person possesses,
                directly or indirectly, the power to direct or cause the
                direction of the management, policies and/or decision making of
                such other Person, whether through the ownership of voting
                securities, by contract or otherwise.

        2.4.    "Co-Branded Site" means the co-branded version of the Enhanced
                Site that will be created in accordance with Section 4 below.

        2.5.    "Content Portal(s)" means the specific aggregations of linked
                content within areas of the Co-Branded Site, which are organized
                around the Telocity Content.

        2.6.    "Enhanced Site" means the enhanced, high-speed version of the
                NBCi Sites focused on rich media content, together with any
                successor site(s) thereof and any co-branded editions of such
                service that have been or may be developed for NBCi's third
                party distribution partners and licensees.

        2.7.    "Impression" means the display of any Promotion on any NBCi
                Site.

        2.8.    "Intellectual Property Right(s)" means any patent, copyright,
                trademark, trade secret, trade dress, mask work, moral right,
                right of attribution or integrity or other intellectual or
                industrial property rights or proprietary rights arising under
                the laws of any jurisdiction (including, without limitation, all
                claims and causes of action for infringement, misappropriation
                or violation thereof and all rights in any registrations and
                renewals).

        2.9.    "Interfaces" means the Front Door Interfaces and the Additional
                Interfaces.

        2.10.   "Last Mile Technologies" means all technologies used to provide
                the last, short-distance link of broadband Internet
                functionality to and from consumers' residences to and from the
                broad telecommunications infrastructure.

        2.11.   "Last Mile Technologies Expenses" means the following Telocity
                expenses incurred in providing Last Mile Technologies as part of
                the Telocity Services through the Co-Branded Site; including,
                without limitation, recurring monthly line cost (which are the
                monthly fees Telocity incurs for last mile connectivity services
                from carriers), nonrecurring telecommunications costs (i.e. RBOC
                costs) and nonrecurring inside wiring costs.

        2.12.   "Launch Date" means the date on which the Co-Branded Site
                functions properly and is made accessible to Users.

        2.13.   "Look and Feel" means the graphical user interface and flow of
                User experience of an Internet site.

        2.14.   "Market Deployment Plan" means the introduction of the Telocity
                Platform in at least thirty-two (32) markets covering
                eighty-five percent (85%) of the DSL-ready homes of Telocity's
                last mile providers in those markets by the end of 2000 and

                                       2
<PAGE>   3

                fifty-one (51) markets covering eighty-five percent (85%) of the
                DSL-ready homes of Telocity's last mile providers in those
                markets by the end of 2001.

        2.15.   "NBC" means the National Broadcasting Company, Inc., a Delaware
                corporation with its principal place of business at 30
                Rockefeller Plaza, New York, New York 10112.

        2.16.   "NBCi Competitor" means any entity or Affiliate thereof listed
                in Exhibit C. NBCi may update this list of competitors
                periodically with the prior written approval of Telocity.

        2.17.   "NBCi's Core Business" means (a) information, navigation and
                content aggregation services distributed primarily through the
                Internet that provide, across more than several topics of
                general interest that do not relate to each other or to a common
                topic, a combination of all or substantially all of the
                following: Internet searching, content aggregation, topical
                interest categories and web directories (a "Portal Service");
                (b) community services distributed, primarily through the
                Internet that offer its members, at a minimum, homepages, e-mail
                and chat rooms (a "Community Service"); or (c) selling or
                marketing a broad range of third party products and services
                primarily through the Internet (an "e-Commerce Service").

        2.18.   "NBCi Aggregate User Data" means any aggregate data collected by
                NBCi or any NBCi subsidiary about Users of broadband services or
                promotions.

        2.19.   "NBCi Marks" means any trademarks, trade names, service marks
                and logos that may be delivered by NBCi to Telocity hereunder.

        2.20.   "NBCi Member" means a User who has registered to become a member
                of one of NBCi's, or one of NBCi's subsidiary's, registration
                based services, including without limitation, the NBCi Sites and
                the free email service available at www.email.com.

        2.21.   "NBCi Product Manager" means an NBCi employee or independent
                contractor holding editorial authority and responsibility for a
                portal, site, collection, area, center or page on the NBCi
                Sites.

        2.22.   "NBCi Properties" means the NBCi Sites and the Co-Branded Site.

        2.23.   "NBCi Services" means the Web-based services offered by NBCi
                through the Co-Branded Site.

        2.24.   "NBCi Sites" means: (i) subject to the "Distributor" (as defined
                in Section 8.1) exclusion in Section 8.1, any and all search and
                aggregation "portal," direct marketing, and commerce Web sites,
                whether operated by NBCi, a subsidiary of NBCi, or a third party
                under an "NBCi" brand, including, without limitation, the Web
                sites located at http://www.snap.com, http://www.xoom.com,
                http://www.nbc.com, and http://www.videoseeker.com, together
                with any mirror sites, any co-branded editions of such site that
                have been or may be developed for

                                       3
<PAGE>   4

                Distributors (other than the Co-Branded Site), and successors to
                the foregoing; (ii) the Enhanced Site, and successors to the
                foregoing; (iii) the International Editions if the parties
                mutually agree in writing pursuant to Section 8.2; (iv) any
                third party Web sites hosted by NBCi; and (v) if NBCi so elects
                within its sole discretion, the Web site located at
                http://www.nbci.com and successors thereto, and NBC's network of
                affiliate Web stations' Web sites, as updated from time to time
                by NBCi in its sole discretion.

        2.25.   "NBCi Wires" means NBCi's email newsletters sent by NBCi or an
                subsidiary to NBCi Members.

        2.26.   "Network Operation Expenses" means fees and monthly depreciation
                cost of network equipment related to the Telocity Services
                including, cost of tail circuits, co-location fees, bandwidth
                capacity costs, POP driven costs, and other network costs (which
                are NOC capital costs, subscriber driven costs, transit costs,
                fixed data exchange costs and monthly backbone costs).

        2.27.   "OSS" means Telocity's operational service and support system
                described in Exhibit B plus the modifications that may be made
                from time to time to such operational service and support
                system.

                2.28. "Overlapping Services" means those products and services
        each party offers to its customers (e.g., utility and communication
        products and services) that share a significant degree of commonality.

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

                2.30. "Promotions" means (i) banners, buttons, windows, portals,
        front door windows, text links, and other promotions that are offered by
        NBCi now or in the future and link directly to the Telocity Sites and/or
        Co-Branded Site from the NBCi Sites; and/or (ii) text links within email
        newsletters distributed by NBCi (including, without limitation, NBCi
        Wires) and other promotions that are offered by NBCi now or in the
        future and link directly to the Telocity Sites and/or Co-Branded Site.

                2.31. "Shipping and Handling Expenses" means all of Telocity's
        shipping and handling expenses incurred in shipping the Gateway to
        Subscribers.

                2.32. "Subscriber Fees" means all fees paid by Subscribers for a
        Telocity Service.

                2.33. "Telocity Aggregate User Data" means any aggregate data
        collected by Telocity or any Telocity subsidiary about Users of
        broadband services or promotions.

                2.34. "Telocity Competitor" means any entity listed in Exhibit
        D. Telocity may update this list of competitors periodically with the
        prior written approval of NBCi.

                                       4
<PAGE>   5

        2.35.   "Telocity Content" means Telocity's and its licensors' text
                links, logos, graphic links, and other materials, tools,
                content, or text that are delivered by Telocity to NBCi
                hereunder.

        2.36.   "Telocity's Core Business" means the provision of next
                generation, Subscriber-based broadband services to consumers
                emphasizing convenience, utility and ease of use. Telocity is
                deploying the first open, end-to-end platform for delivering
                these services to its Subscribers, both to the home and
                throughout the home which provides an infrastructure for
                delivering value-added services to Subscribers.

        2.37.   "Telocity Database" means User Profile Data and any other
                information relating to Users of the Telocity Sites or the
                Co-Branded Site or other customers of Telocity or purchasers of
                Telocity Services who have had information about them collected
                or otherwise obtained by Telocity, or for Telocity's use or
                benefit, for the purpose of direct marketing or other
                communication activities, and all updates or additional
                information that may be added to such database during the Term.

        2.38.   "Telocity Fraction" for a quarter means (a) the total number of
                pages displayed by the Co-Branded Site for during the quarter,
                divided by (b) the total number of pages displayed by the entire
                NBCi Properties for such period; provided, however, that at such
                time as NBCi distinguishes between broadband and narrow band
                editions in its ad serving accounting, item (b) shall be limited
                to the pages displayed by the broadband editions of the NBCi
                Properties for such period.

        2.39.   The "Telocity Gateway" (or the "Gateway") means the gateway
                described in Exhibit B, plus the modifications that may be made
                from time to time to such gateway.

        2.40.   "Telocity Marks" means Telocity's and its licensors' trademarks,
                trade names, service marks and logos that may be delivered by
                Telocity to NBCi hereunder.

        2.41.   "Telocity Network" means Telocity's network described in Exhibit
                B plus the modifications that may be made from time to time to
                such network.

        2.42.   "Telocity Only Service" means a Telocity service that is not an
                Overlapping Service.

        2.43.   "Telocity Services" means any and all services and products
                offered through the Telocity Platform.

        2.44.   "Telocity Sites" means the Internet site operated by Telocity at
                http://www.telocity.com, together with any mirror sites, which
                shall not provide products or services competitive with those
                offered on the Co-Branded Site.

        2.45.   "Telocity Users" means all Users described in the Telocity
                Database.

        2.46.   "Telocity Window" means a window on the Front Door Interfaces as
                described in Section 4.3.

                                       5
<PAGE>   6

        2.47.   "Term" means the term of this Agreement as defined in Section
                12.1.

        2.48.   "User" means any end-user of the Web.

        2.49.   "User Profile Data" means data regarding a User provided by the
                User on the NBCi Sites, the Telocity Sites or the Co-Branded
                Site or otherwise to NBCi or Telocity: the User's name,
                password, hint question, hint answer, birthday, zip code,
                country, time zone and gender.

        2.50.   "Web" means the World Wide Web part of the Internet.

3.      Telocity Platform.

        3.1.    Proprietary Technology. Telocity and/or (to the best of
                Telocity's knowledge) its licensors own, and over the
                course of the Term shall own pursuant to Section 13.8,
                various patents and other Intellectual Property Rights
                in certain technology that enable Telocity to create and
                operate the Telocity Platform and provide the Telocity
                Services (the "Proprietary Technology"), including, but
                not limited to, the following:

                3.1.1   the automated personal computer/telephone-based loop
                        qualification for a customer's DSL line qualification,
                        Web-based customer sign-up, and Web-based system for
                        deployment, provisioning and customer support.

                3.1.2   The Gateway combines a DSL modem, an analog modem, and a
                        microprocessor unit that automates installation,
                        customer support and service upgrades. The Gateway
                        allows a consumer who subscribes to a Telocity Service
                        (a "Subscriber") to split the broadband Internet
                        connection to multiple devices within the home. The
                        Gateway allows for the measuring, metering and billing
                        of both subscription and value added services provided
                        to the Subscriber.

        3.2.    Telocity Platform Described. Telocity has developed and is using
                the Proprietary Technology to provide to consumers a broadband
                Internet distribution platform consisting of the Gateway, the
                Telocity Network, and OSS (collectively, the "Telocity
                Platform") that will facilitate the delivery of broadband
                Internet access services to, and throughout, the home. The
                Telocity Platform is an "always on", automated broadband service
                platform that is available to consumers utilizing the Gateway.
                Telocity will use the Telocity Platform to deploy broadband
                Internet service to the home initially via DSL, but also via
                other means of high data rate connections to the home such as
                cable, wireless local loop, satellite and any such delivery
                platforms that may emerge as reasonably accepted industry
                standards in the future.

        3.3.    Modifications. Telocity agrees to consider in good faith any
                reasonable requests of NBCi to modify the Telocity Platform from
                time to time to improve the Telocity Platform's ability to work
                with the Co-Branded Site and the Interfaces. For purposes of
                this Agreement, all modifications to the Telocity Platform,

                                       6
<PAGE>   7

                including those made pursuant to this Section 3.3, shall be
                deemed to be included within the defined term Telocity Platform.

4.      Co-Branded Site.

        4.1.    Co-Branded Site Described. NBCi will develop the Co-Branded Site
                for use with the Telocity Platform in accordance with this
                Section 4, and Telocity will provide reasonable assistance in
                connection therewith. The Co-Branded Site will be a co-branded
                version of the Enhanced Site focused on instant access to
                information, communications, utility, and entertainment/media
                content and will include, among other things, content and
                services tailored to capitalize on the always on, broadband
                environment. The parties will jointly develop the specifications
                for the Co-Branded Site, and NBCi will create the Co-Branded
                Site according to the joint specifications developed by the
                parties. NBCi, however, will have ultimate decision making
                authority over all aspects of the Co-Branded Site, including the
                content contained therein, subject to compliance with the
                mutually agreed upon specifications.

        4.2.    Front Door Interfaces. NBCi will develop interfaces to the
                Co-Branded Site for: (i) the personal computer; (ii) the
                television; and (iii) devices with flat panel displays in which
                the presentation of information will be similar to that of a
                personal computer (e.g. information appliances), specifically
                designed for the broadband delivery of high-speed Internet
                access over the Telocity Platform (collectively, the "Front Door
                Interfaces"). The parties will collaborate to provide input to
                the development of specifications for the Front Door Interfaces,
                and the specifications will detail a User experience that is
                compatible with the Co-Branded Site. NBCi will create the Front
                Door Interfaces according to the joint specifications developed
                by the parties. NBCi, however, will have ultimate decision
                making authority over all aspects of the Front Door Interfaces
                (other than the Telocity Window), subject to compliance with the
                mutually agreed upon specifications.

        4.3.    Telocity Window. The Telocity Window will appear on the Front
                Door Interfaces at any time there is Telocity Content, Telocity
                Services or Telocity technologies (i.e., technologies and/or
                access to technologies which may appear in an Additional
                Interface) that cannot be effectively integrated into the Front
                Door Interface. The Telocity Window may contain only Telocity
                Content, Telocity Services and Telocity technologies (i.e.,
                technologies and/or access to technologies which may appear in
                an Additional Interface) that cannot be effectively integrated
                into the Front Door Interface at that time. The parties will
                collaborate to provide input to the development of
                specifications for the Telocity Window, including which party
                will host the Telocity Window, and the specifications will
                detail a User experience that is compatible with the Co-Branded
                Site. NBCi will create the Telocity Window according to the
                joint specifications developed by the parties. Telocity,
                however, will have ultimate decision making authority over all
                aspects of the Telocity Window, subject to compliance with the
                mutually agreed upon specifications.

                                       7
<PAGE>   8

        4.4.    Additional Interfaces. The parties anticipate that over time
                different interfaces to the Co-Branded Site or other information
                in addition to the Front Door Interfaces ("Additional
                Interfaces") will be created for other devices (e.g. flat-panel
                displays other than those included within Front Door Interfaces,
                wireless devices (WAP format and future format standards that
                may emerge), personal digital assistants, cordless phones,
                cellular phones, information appliances which do not present
                information in a similar manner to that of a personal computer,
                and other devices that may emerge in the future) (the "Other
                Devices") for use in the home and "on the go" which will
                necessitate that content from the Co-Branded Site or other
                sources be displayed in different formats. For Additional
                Interfaces designed and created by NBCi as set out in Section
                4.5, the parties will jointly develop the specifications for the
                Additional Interfaces with the intention of creating a
                consistent and cohesive User experience across the various
                features and applications offered on the Co-Branded Site. The
                goal with such Additional Interfaces will be to mix the
                functional requirements of the Other Device while maintaining a
                consistent Look and Feel to the Co-Branded Site. However, for
                such Additional Interfaces designed by a party, ultimate
                decision making authority will reside with a party, subject to
                compliance with the mutually agreed upon specifications.

        4.5.    Review and Implementation of Content for Other Devices and
                Additional Interfaces. NBCi and Telocity will jointly develop
                the Top Level Specifications for the design of Additional
                Interfaces. Both parties agree to make good faith efforts to
                analyze the cost and revenue potential for each Other Device and
                share information pertaining to market research, consumer
                behavior, emerging business models, and other such relevant
                information. Prior to beginning the process itself or with a
                third party, Telocity agrees to give NBCi at [*] days after
                delivery of a written request to NBCi to determine whether NBCi
                will provide content from the Co-Branded Site to an Additional
                Interface for an Other Device and design and create the
                Additional Interface for such Other Device. NBCi may, in its
                sole discretion, determine that the aggregation, packaging, and
                design of content from the Co-Branded Site for delivery to a
                specific Other Devices is not commercially and/or strategically
                viable to pursue.

                4.5.1   Should NBCi elect to provide content designed for the
                        Other Device in a manner that is compatible with an
                        Additional Interface and implement the joint
                        specifications for the Additional Interface, NBCi will
                        make commercially reasonable efforts to deliver the
                        content and the Additional Interface within a mutually
                        agreed upon period of time.

                4.5.2   Should NBCi elect to provide content designed for the
                        Other Device in a manner that is compatible with an
                        Additional Interface but not design and create such
                        Additional Interface, (i) NBCi will make commercially
                        reasonable efforts to deliver the content within a
                        mutually agreed upon period and (ii) Telocity may
                        contract with an independent third party, who is not an
                        NBCi Competitor, to provide such Additional Interface
                        design and creation services, provided that such
                        services are delivered to the

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       8
<PAGE>   9

                        Subscriber in such a manner that the Subscriber
                        experiences the same Look and Feel of the Co-Branded
                        Site across the various Interfaces.

                4.5.3   Should NBCi decide to neither provide such content nor
                        design and create such Additional Interface, Telocity
                        shall ask NBCi, for a mutually agreed fee, for NBCi to
                        provide additional resources needed to provide content
                        and create and design such Additional Interface, and if
                        the parties are unable to reach agreement with respect
                        to such fee within ten (10) days, then Telocity may
                        contract with an independent third party, who is not an
                        NBCi Competitor, to provide such services, provided that
                        such services are delivered to the Telocity Subscriber
                        in such a manner that the User experiences the same Look
                        and Feel of the Co-Branded Site, to the extent
                        reasonable, across the various Interfaces.

        4.6.    Co-Branding Features. Each page on the Co-Branded Site will
                include branding for NBCi and Telocity so that the NBCi Marks
                and Telocity Marks are both Above the Fold and are of
                substantially equivalent value and prominence to each other.
                Telocity Services and the customer care features for such
                services will also be prominently displayed on the Co-Branded
                Site. The parties shall mutually agree on the branding for
                content delivered from the Co-Branded Sites to Other Devices and
                the Additional Interfaces.

        4.7.    Launch Date. NBCi and Telocity will use diligent efforts to
                achieve a Launch Date for the Co-Branded Site before [*].

        4.8.    Hosting. Except as expressly set forth in this Agreement, NBCi
                will host the Co-Branded Site and the Front Door Interfaces on
                its servers, on servers within its control, or servers of a
                third party under contract with NBCi and will provide all
                computer hardware, software and personnel necessary to operate
                and maintain the Co-Branded Site as a functional site accessible
                to Users.

        4.9.    Advertising. NBCi shall own and have the right to use or sell
                all of the advertising inventory on the Co-Branded Site, except
                that neither NBCi or any NBCi subsidiary shall display on the
                Co-Branded Site any window or banner advertisements for Telocity
                Competitors. Moreover, other than as expressly set forth herein,
                NBCi shall have the right to display any third party links,
                media, banner advertisements, other promotions, and/or paid or
                unpaid editorial content anywhere on the NBCi Sites.

        4.10.   DNS Redirecting. Except as expressly set forth in this
                Agreement, using Domain Name System redirection, the URL for the
                Co-Branded Site will begin with http://telocity.snap.com.
                Telocity agrees that NBCi will be entitled to count all page
                views of the Co-Branded Site towards NBCi's traffic as measured
                by Media Metrics and other Internet traffic-auditing firms.

        4.11.   Harvesting. Telocity shall provide all Telocity Content as
                required herein pursuant to NBCi's harvesting technical
                specifications, as updated in NBCi's sole

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.
                                       9
<PAGE>   10

                discretion from time to time, including those set forth at
                http://partnermarketing.snap.com/guide/htmlharvest.html
                (Standard HTML Harvest Specifications),
                http://partnermarketing.snap.com/guide/htmlsample.html (Sample
                of HTML harvested content);
                http://partnermarketing.snap.com/Thor/media_mockups.html (Rich
                Media Harvesting Specifications), or any other successor URLs
                designated by Snap. Harvested Telocity Content will maintain the
                Enhanced Sites' Look and Feel and will include branding for
                Telocity using Telocity Marks, in such form and placement as a
                NBCi Product Manager shall determine in his or her sole
                discretion. Telocity shall ensure that all Telocity Content
                remains at all times current by continually providing NBCi with
                timely updates to the Telocity Content. Furthermore, under no
                circumstances shall Telocity Content include any content of a
                NBCi Competitor, reference an NBCi Competitor or a service which
                conflicts with an offering of NBCi.

        4.12.   Exclusivity. During the Term, except as expressly provided
                otherwise in this section, NBCi shall be the exclusive Internet
                content provider to Telocity for the Telocity Platform for
                utility, communications, media and entertainment content
                (collectively, the "Exclusive Content"). In addition, Telocity
                may not enter into any other agreement with third parties for
                provision of Portal Services, Community Service or E-Commerce
                Services on the Telocity Platform during the Term. Further,
                during the Term, Telocity may not own any material equity
                interest in, loan any monies to, or enter into any joint venture
                or partnership with any NBCi Competitor without the consent of
                NBCi. If Telocity identifies a category of products or a content
                area within the Exclusive Content that is then currently not
                provided by NBCi ("Unavailable Content"), Telocity shall notify
                NBCi in writing of such deficiency; provided, however, that
                Telocity may not request a product or content specific to a
                particular vendor. If NBCi does not notify Telocity in writing,
                within [*] of NBCi's receipt of Telocity's notification, of
                NBCi's election to deliver, or is not able to deliver, within a
                mutually agreeable time period from such notification, the
                Unavailable Content, Telocity shall have the right to contract
                with an independent third party for development services to
                produce the Unavailable Content, provided that (i) NBCi is not
                obligated to pay for such incremental services, and (ii) no NBCi
                Competitors may be chosen by Telocity unless the desired product
                or content is only available from an NBCi Competitor. Telocity
                shall select third party content providers that are consistent
                with the same level of quality, experience, and reliability
                offered on the combined Telocity Platform and Co-Branded Site.

        4.13.   Promotional Exclusivity. During the first three (3) years of the
                Term, NBCi will not promote, through co-branded, on-air
                television marketing, any Telocity Competitors offering
                broadband delivery of Internet services. However, NBCi shall
                have the right to terminate the promotional exclusivity set out
                in this section under the following circumstances: (a) Telocity
                fails to launch the Telocity Platform in more than fifty percent
                (50%) of the service markets on an annual basis as designated in
                the Market Deployment Plan, (b) in the event that Patti
                Manuel-Hart should leave the employ of Telocity for any reason
                during the first

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.
                                       10
<PAGE>   11

                three (3) years of the Term, or (c) within eighteen (18) months
                following the Effective Date, Telocity fails to complete a
                Qualifying Offering (as defined in Telocity's Third Amended and
                Restated Articles of Incorporation) or a private placement of
                its debt or equity securities (not including the private
                placement contemplated by the Stock Purchase Agreement) that
                results in net proceeds to Telocity of an amount that will
                enable the continued expansion of the Subscriber base for the
                Telocity Platform at least fifty percent (50%) of the rates set
                forth in the Market Deployment Plan for a period of six (6)
                months following the closing of such Qualifying Offering or
                private placement, as applicable.

        4.14.   Satellite Delivery. Telocity agrees to grant NBCi's Affiliate,
                GE AmeriCom, a right of first negotiation for the delivery of
                the Telocity Service via satellite. This right is strictly for
                the carriage of Telocity Service via satellite. This right does
                not pertain to any content distribution on the Telocity Service.
                Beginning after thirty (30) days following the date that
                Telocity provides GE Americom with written notice of its desire
                to begin such discussions, which shall not be sent by Telocity
                before Telocity is prepared to begin good faith negotiations,
                Telocity shall be free to begin discussions with third parties
                regarding the satellite delivery of the Telocity Services. The
                parties agree that time is of the essence with respect to this
                Section 4.14.

        4.15.   Video Programming and Channels. In the event that, during the
                Term, Telocity or NBCi desires to offer any new class or type of
                video programming or channels (i.e., full motion video of [*] or
                more in length) containing news, sports or entertainment on the
                Telocity Platform or the Co-Branded Site, Telocity or NBCi, as
                the case may be (the "Offering Party"), shall so notify NBC in
                writing. NBC and the Offering Party shall then negotiate
                exclusively and in good faith with one another for a period of
                thirty (30) days following NBC's receipt of such written notice
                concerning the inclusion of video programming or channels of NBC
                and its affiliates (including, for example, anything broadcast
                on the NBC Television Network, all television stations owned and
                operated by NBC or any cable, digital or Internet network owned
                or controlled by NBC or its affiliates). In the event that the
                parties are unable to reach a final agreement during such
                period, then, on the last day of such period, the Offering Party
                shall submit to NBC its final offer, in writing (the "Offer"),
                which offer shall be made in good faith and shall represent the
                price, terms and conditions that the Offering Party reasonably
                expects to receive for such programming or channel in an
                arm's-length transaction with a third party. NBC shall then have
                ten (10) business days to accept or reject the Offer. If NBC
                rejects the Offer, the Offering Party shall be free to negotiate
                with and enter into agreements with third party(s) with respect
                to such video programming or channels. NBC and Telocity
                acknowledge that, in accordance with Section 4.12 hereof, NBCi
                shall be the exclusive Internet content provider to Telocity for
                the Telocity Platform for media and entertainment content and
                that this Section 4.15 does not limit such exclusivity in any
                manner. This Section 4.15 shall not be amended without the
                written consent of NBC.

5.      Product Development; Overlapping Services.

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       11
<PAGE>   12

        5.1.    Product Development. Both parties shall mutually agree to the
                top-level specifications and objectives ("Top Level
                Specifications") for overall jointly developed product offerings
                relating to the Telocity Network, End User Hardware and Software
                Products, and associated software and utilities.

        5.2.    Telocity Network. The parties shall mutually develop the Top
                Level Specifications and requirements of the Telocity Network,
                including content distribution infrastructure, network speed,
                hosting capabilities, usage monitoring and interconnect points,
                for the purpose of supporting a jointly developed product
                offering. Under no circumstances will such collaboration be
                construed to create or grant NBCi or any NBCi Affiliate any
                Intellectual Property Rights in the Telocity Platform or any
                component thereof, such as the Gateway or the OSS. Telocity will
                reasonably consider NBCi's comments with respect to the Telocity
                Network, but Telocity will have the ultimate decision making
                authority with respect to the Telocity Network, subject to
                compliance with the Top Level Specifications. NBCi will
                reasonably consider Telocity's comments with respect to
                advertising serving and tracking, but NBCi will have the
                ultimate decision making authority with respect to the with
                respect to advertising serving and tracking.

        5.3.    End User Hardware and Software Products. The parties shall
                mutually develop the Top Level Specifications and requirements
                of the joint hardware and software offerings (respectively, "End
                User Hardware" and "Software Products"), including Gateway
                capabilities, software installer features, and integration of
                software and services onto the Subscriber's operating system.
                Telocity will reasonably consider in good faith NBCi's comments
                with respect to End User Hardware and Software Products, but
                Telocity will have the ultimate decision making authority with
                respect to the End User Hardware and Software Products, subject
                to compliance with the Top Level Specifications. Under no
                circumstances will such collaboration be construed to create or
                grant NBCi or any NBCi Affiliate any Intellectual Property
                Rights in the Telocity Platform or any component thereof, such
                as the Gateway or the OSS.

        5.4.    New Product/Service Milestones. Telocity agrees to use
                commercially reasonable efforts to introduce at least one new
                product or service for use on the Telocity Platform [*]
                following the Effective Date.

        5.5.    Overlapping Services. Although NBCi's Core Business and
                Telocity's Core Business are distinctly different businesses,
                the parties acknowledge that there is and may nevertheless be
                Overlapping Services. Each party shall share in the revenue
                streams created by the Overlapping Services as set forth in
                Section 10.1. In order to maximize and coordinate the collective
                opportunity presented by Overlapping Services, the parties agree
                as follows:

                5.5.1   If either party has an existing product or service, and
                        the other party wishes to offer an Overlapping Service,
                        then the other party will be free to

                                       12
<PAGE>   13

                set features, pricing and revenue models for such Overlapping
                Service, but will confer with the party with the existing
                product or service.

                5.5.2   In all instances where NBCi releases a generally
                        commercially available full production version of an
                        Overlapping Service which is similar to an existing
                        Telocity Service, then the existing revenue share for
                        the applicable Telocity Services shall be adjusted as
                        provided in Section 10.1. For those Overlapping Services
                        that are non Web-based, NBCi shall design such
                        Overlapping Service to include materially enhanced
                        features and functionality to distinguish the product
                        from the Overlapping Service offered by Telocity.

                5.5.3   In all instances where Telocity releases a generally
                        commercially available full production version of an
                        existing NBCi Service, Telocity shall design such
                        Overlapping Service to include materially enhanced
                        features and functionality to distinguish the product
                        from the Overlapping Service offered by NBCi.

                5.5.4   If an Overlapping Service is identified by either party,
                        then the parties will work together to develop the
                        specifications for integrating the product or services
                        into the Telocity Platform and the Co-Branded Site, as
                        appropriate.

                5.5.5   Any disputes concerning Overlapping Services will be
                        subject to the negotiation procedures described in
                        Section 19. If the negotiation procedures detailed in
                        Section 19 fail, then both parties agree that such
                        "Overlapping Services" will be placed within the
                        Telocity Window. The purpose of such placement will be
                        to minimize the confusion to the Subscriber caused by
                        the placement of two (2) similar products that do not
                        offer distinctly differentiated features or
                        functionality.

6.      Account Management.

        6.1.    Service Quality Milestones. Both parties will mutually agree in
                writing on an annual basis on appropriate performance criteria
                for the Telocity Services and Co-Branded Site.

        6.2.    Billing. Telocity shall be solely responsible for all billing,
                collection services and customer support services with respect
                to all products and services delivered by the parties to
                Subscribers via the Telocity Platform.

        6.3.    Account Management.

                6.3.1.  Account and Contact Managers. For the purposes of this
                        Agreement, [*] shall be NBCi's account manager for
                        Telocity and [*] shall be Telocity's contact manager for
                        NBCi (collectively, the "Managers"). Subject to Section
                        20.12, the Managers shall be the primary

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       13

<PAGE>   14

                        points of contact for inquiries and requests and
                        information related to the activities conducted by
                        either party pursuant to this Agreement. Each Manager
                        shall provide the other with such information and
                        assistance as may be reasonably requested by the other
                        from time to time. Either party to this Agreement may
                        change its designated Manager by giving the other party
                        written notice of such change provided in accordance
                        with Section 20.12.

                6.3.2.  Meetings. Each party shall designate a team of
                        individuals for specific responsibilities of the party
                        under this Agreement, such as technical integration and
                        marketing (collectively, the "Teams"). Each party's Team
                        shall include the active participation of at least one
                        (1) officer at the vice president level. The individuals
                        on the initial Teams are outlined in Exhibit F. Each
                        team will meet on a frequency determined to be necessary
                        by the applicable team, but no less than once per month
                        during the first three (3) years of the Term and
                        approximately at least once per quarter during each year
                        thereafter; each of those Teams shall meet separately at
                        the offices of Telocity or NBCi (with the location to
                        alternate between the two) to monitor and manage the
                        relationship of the parties and any items under this
                        Agreement either party wishes to bring to the attention
                        of the other party.

                6.3.3.  Annual Review. Beginning three (3) years after the
                        Effective Date, the parties will meet on an annual basis
                        to review the business arrangement set out in this
                        Agreement in light of changed industry conditions and
                        other business considerations and mutually agree upon
                        certain milestones to be set forth for the remainder of
                        the Term with respect to both parties' continued
                        performance under this Agreement. Any modifications or
                        amendments to this Agreement relating to such milestones
                        will require the written consent of both Telocity and
                        NBCi.

                6.3.4.  Board Review. NBCi and Telocity agree to review the
                        status of the activities specified in this Agreement at
                        least twice a year during each party's respective board
                        meetings.

7.      Advertising, Marketing and Promotion.

        7.1.    Email Solicitations. During the Term, NBCi will have the
                exclusive right to transmit all direct marketing email
                solicitations to Subscribers as provided in Section 9, except as
                provided in Section 9.4.

        7.2.    Marketing by Telocity. Subject to Section 13.5, Telocity shall
                use commercially reasonable efforts to market the Telocity
                Services in the relevant local markets of the United States, by
                direct marketing to Subscribers by means other than email
                solicitations, including, without limitation, voice messaging in
                the message inbox, print advertising, direct physical mail,
                outdoor, radio and television, and other means of marketing that
                may emerge in the future; provided, however, Telocity

                                       14
<PAGE>   15

                shall not use email in any such marketing activities except as
                provided in Section 9.4. All third party messages included in
                such marketing efforts will contain no content of or reference
                to NBCi Competitors. The third party messages shall not be on
                behalf of any third parties and shall be solely for the purpose
                of promoting or upselling Telocity Services and the Telocity
                Platform; provided, however, that such third party messages may
                include third party products and services (for example, in
                connection with Telocity's affinity program) without NBCi's
                approval from entities that are not NBCi Competitors so long as
                the third party product or service is not in a category for
                which NBCi has an express contractual relationship (of which
                Telocity has notice) with respect to the direct marketing of
                such product or service. NBCi will provide Telocity with a list
                of such relationships within thirty (30) days of the Effective
                Date and will update the list from time to time. Telocity will
                be responsible for all marketing expenses for the Telocity
                Services with the exception of the Promotions described in
                Section 7.5.

        7.3.    Promotional Events. Both parties shall make good faith efforts
                to identify additional promotional events to support the
                Telocity Services (e.g. special product and marketing
                announcements ) and the Co-Branded Site through the use of the
                Co-Branded Site to deliver exclusive broadband content for such
                promotional events to Telocity Subscribers.

        7.4.    Online Promotion Design. Telocity will design and create all
                Telocity Content required for the Promotions in accordance with
                NBCi's technical and editorial guidelines, as updated in NBCi's
                sole discretion from time to time, including those set forth at
                http://www.snap.com/media/ or any successor URL designated by
                NBCi.

        7.5.    Online Promotions. Beginning on the Effective Date, NBCi will
                use commercially reasonable efforts to deliver a total value of
                online promotional value in the aggregate dollar amount of Five
                Million Dollars ($5,000,000) during the first three (3) years of
                the Term through the delivery of Impressions on the NBCi Sites;
                provided, however, that at least fifty percent (50%) of all
                Impressions delivered hereunder shall be delivered to the
                locations of the NBCi Sites as mutually agreed in writing by the
                parties. Except as specified in the foregoing sentence, the
                delivery of the Impressions hereunder and the format of the
                Promotions will be based on a schedule and placement guidelines
                selected by NBCi, in its sole discretion and at the rates set
                forth in the applicable NBCi standard rate card. Any Impression
                not listed in the applicable NBCi standard rate card shall be
                assigned the value of a comparable Impression on such rate card
                by NBCi. If NBCi fails to deliver the required number of
                Impressions during the first three (3) years of the Term,
                Telocity agrees that NBCi shall have an additional six (6)
                months to deliver such Impressions.

8.      Co-Branded and International Editions.

        8.1     Co-Branded Editions. Telocity acknowledges that NBCi produces
                co-branded editions of the NBCi Sites for various resellers,
                distributors, other licensees and/or

                                       15
<PAGE>   16

                joint venture partners (collectively the "Distributors"). In
                some cases, such Distributors are entitled to replace NBCi's
                default content with other content within their own co-branded
                editions of any NBCi Site. Notwithstanding any other provisions
                of this Agreement, if any such Distributor has exercised its
                right to replace Telocity Content with other content, then NBCi
                will not be required to display the Promotions or Telocity
                Content within such Distributor's co-branded edition of the NBCi
                Sites. If NBCi does display the Promotions or Telocity Content
                within a co-branded edition of any NBCi Site, such display will
                be governed by this Agreement.

        8.2     International Editions. NBCi is currently considering creating
                one (1) or more international editions of the NBCi Sites to
                reflect appropriate localized and local partner content
                ("International Editions") and may desire to include localized
                Telocity Content within such International Editions. Upon NBCi's
                request, Telocity agrees to negotiate in good faith regarding
                the terms under which Telocity would agree to amend this
                Agreement to grant NBCi the right to include Telocity Content
                and Promotions on one (1) or more International Editions.

9.      User Profile Data and Direct Marketing.

        9.1.    Data Ownership. Each Subscriber whose User Profile Data is
                collected by a party or its subsidiaries through the Co-Branded
                Site, the Telocity Site or the Telocity Platform, shall be asked
                to consent to the provision of such User Profile Data to the
                other party. Each party shall in its reasonable discretion,
                place and word such consent request on the Co-Branded Site, the
                Telocity Sites and the Telocity Platform, as applicable, and
                shall consider comments from the other party with respect to
                such consent requests. The User Profile Data for each Subscriber
                who so consents shall be provided to the other party and shall
                be jointly owned by NBCi and Telocity. Any data collected
                through the Co-Branded Site for all other Users, except for the
                Telocity Aggregate User Data, shall remain owned solely by NBCi.
                At all times, NBCi will be the sole owner of all User data that
                is collected from the NBCi Sites and Telocity will be the sole
                owner of all User data that is collected from the Telocity
                Sites. NBCi Aggregate User Data and Telocity Aggregate User Data
                shall be jointly owned by NBCi and Telocity. Before a User is
                permitted to become a Subscriber, the User must consent (e.g.,
                in the Telocity terms of service) to the provision of the User's
                User Profile Data to NBCi.

        9.2.    Use of Information and Confidentiality. Each party will have the
                right to use any information provided by the other party subject
                to the confidentiality restrictions set forth in Section 20.4.
                All data collected from Users through the Co-Branded Site, the
                Telocity Sites and the Telocity Platform will be kept
                confidential and not disclosed to non-affiliated third parties
                by each party in accordance with the privacy policy and
                standards established by that party's respective privacy policy.

        9.3.    Direct Marketing. During the Term, NBCi, shall have the
                exclusive right to use (or allow an Affiliate to use, in which
                case all references to "NBCi" in this Section 9 shall refer to
                such Affiliate) the information contained in Telocity

                                       16
<PAGE>   17

                Database for email-based direct marketing purposes as set forth
                in this Section (with the exception of customer correspondence
                specifically pertaining to non-commercial communications with
                Subscribers, including, but not limited to, customer service,
                billing and technical support). NBCi shall have a right to
                execute, or cause to be executed, promotional email offers to
                all or some of the Users described in the Telocity Database.
                Such email offers shall be drafted by NBCi following a mutually
                agreed upon template, approved by Telocity (and such approval
                shall not be unreasonably withheld) and will appear to come from
                "Telocity and Snap"; provided, however, each email will not be
                subject to Telocity's approval. Such email messages may have
                links to the NBCi Sites or the Co-Branded Site, as NBCi shall
                decide in its sole discretion. Products offered in such emails
                may include NBCi's products or services or third party products
                and/or services that NBCi has the right to offer, and NBCi shall
                select all of such products to be offered in its sole
                discretion. NBCi agrees that any direct marketing solicitations
                to Subscribers will not include advertisements or commercial
                messages for Telocity Competitors. NBCi may choose to distribute
                emails to some or all Users in Telocity Database. NBCi shall
                also have the option to create and host "sell" pages for any
                marketing campaign, arrange for purchase orders to be processed
                and fulfilled, and for customer service and inventory matters to
                be coordinated in relation to the products offered in emails
                distributed pursuant to this Section, as NBCi shall determine in
                its sole discretion. All direct marketing solicitations will
                afford the User with an easy and accessible means to
                unsubscribe. NBCi agrees that co-branded advertisements will not
                include advertisements or commercial messages for Telocity
                Competitors.

        9.4.    Telocity Promotional Offers. Notwithstanding Section 9.3,
                Telocity shall have the right to send (i) emails to Users
                described in Telocity Database solely with respect to the
                billing and administration of the Telocity Services; and (ii)
                periodic email newsletters related to the Telocity Services, but
                such emails and newsletters may not promote services provided by
                an NBCi Competitor. Further, Telocity may present promotional
                offers to its Subscribers with their bill or newsletter (the
                "Promotional Offers"). The Promotional Offers shall not be on
                behalf of any third parties and shall be solely for the purpose
                of promoting or upselling Telocity Services; provided that,
                however, such Promotional Offers may include third party
                products and services (for example, in connection with
                Telocity's affinity program) without NBCi's approval from
                entities that are not NBCi Competitors so long as the third
                party product or service is not in a category for which NBCi has
                an express contractual relationship with respect to such product
                or service. NBCi will provide Telocity with a list of such
                relationships and will update the list from time to time. With
                the exception of the aforementioned emails and newsletters, all
                other emails to Users described in Telocity Database will be
                delivered by NBCi in order to ensure a consistent marketing
                message.

        9.5.    Telocity Database Management. Subject to Telocity's agreements
                with Subscribers, on or before the Launch Date, Telocity will
                electronically send NBCi all User Profile Data then contained in
                the Telocity Database to one (1) or more FTP addresses
                designated by NBCi in a mutually agreed upon format. In the

                                       17
<PAGE>   18

                event that such agreements prohibit the foregoing, Telocity will
                make best efforts to obtain consent of the Subscribers to the
                transfer of the User Profile Data to NBCi. Beginning one (1)
                month following the Launch Date, on a monthly basis, Telocity
                will send NBCi updates of the User Profile Data. Such updates
                will be provided in a mutually agreed-upon format. Both parties
                will use commercially reasonable efforts to implement NBCi's
                universal User registration process by the Launch Date so that
                Users who have registered to become Subscribers do not need to
                again enter their personal data to become NBCi Members. Telocity
                will provide NBCi, on a monthly basis, Telocity's standard
                report containing the Telocity Aggregate User Data.

        9.6.    NBCi Aggregate User Data Management. NBCi will provide Telocity,
                on a monthly basis, NBCi's standard report containing the NBCi
                Aggregate User Data.

10.     Payments and Credits.

        10.1.   Revenue Sharing.

                10.1.1  Telocity Only Services. Beginning on the Launch Date,
                        Telocity shall pay to NBCi, on a quarterly basis, ten
                        percent (10%) of the net revenues actually received by
                        Telocity for the basic Telocity internet access service.
                        For purposes of this Section 10.1.1, net revenues shall
                        mean gross revenues less a cost of goods sold figure
                        based on the following items: (i) Last Mile Technologies
                        Expenses, (ii) Shipping and Handling Expenses, and (iii)
                        Network Operations Expenses, but excluding all Gateway
                        rebate expenses, which shall be treated as customer
                        acquisition costs by Telocity.

                10.1.2  Value-Added Services. Telocity will pay, on a quarterly
                        basis, ten percent (10%) of the net revenues actually
                        received by Telocity for value-added services, which are
                        Telocity subscriber services other than internet access.
                        For the first eighteen (18) months after the Effective
                        Date, net revenues shall mean gross revenues less a cost
                        of goods sold figure based on the following items: (i)
                        Last Mile Technologies Expenses, (ii) Shipping and
                        Handling Expenses, and (iii) Network Operations
                        Expenses, but excluding all Gateway rebate expenses,
                        which shall be treated as customer acquisition costs by
                        Telocity. After eighteen (18) months from the Effective
                        Date, net revenues for value-added services will be
                        calculated as gross revenues less a cost of goods sold
                        figure arrived at in accordance with generally accepted
                        accounting principles.

                10.1.3  Overlapping Services. At such time as a value-added
                        service is an Overlapping Service, Telocity will pay
                        NBCi, on a quarterly basis, forty percent (40%) of the
                        net revenues referenced in Section 10.1.2 actually
                        received from revenues generated by the Overlapping
                        Service provided by Telocity.

                                       18
<PAGE>   19

                10.1.4  NBCi Services. NBCi shall pay Telocity, on a quarterly
                        basis, forty percent (40%) of the net revenues actually
                        received by NBCi or its subsidiaries derived from (i)
                        all revenue from advertising running on the Co-Branded
                        Site (including, but not limited to, banner ads and
                        windows) multiplied by the Telocity Fraction; (ii)
                        anchor tenancies and other tenancies that are solely on
                        the Co-Branded Site; (iii) e-Commerce Services
                        (including but not limited to, targeted e-mails and
                        product sales, fees for "host and sell" pages, and
                        transaction fees from national online merchants)
                        attributable to Subscribers (NBCi will make best efforts
                        to ensure that such revenues can be attributed to
                        Telocity Subscribers); and (iv) subscription and pay per
                        view media (including but not limited to, music, video,
                        gaming, and other media services) attributable to
                        Telocity Users. For purposes of this Section 10.1.4,
                        "net revenues" shall mean gross revenues actually
                        received by NBCi or its subsidiaries, less, as
                        applicable, agency fees, selling expenses, returns, bad
                        debt expenses, revenue sharing expenses payable to third
                        parties, content fees, licensing fees, fraud,
                        commissions and service fees. After eighteen (18) months
                        from the Effective Date, net revenues for NBCi Services
                        will be calculated as gross revenues less a cost of
                        goods sold figure arrived at in accordance with
                        generally accepted accounting principles.

                10.1.5  Unavailable Content. In the event that Telocity chooses
                        to contract with an independent third party for
                        Unavailable Content, NBCi shall receive forty percent
                        (40%) of the gross revenues actually received from the
                        placements of such Unavailable Content within the
                        Telocity Platform, less, as applicable, agency fees,
                        selling expenses, returns, bad debt expenses, revenue
                        sharing expenses payable to third parties, content fees,
                        licensing fees, fraud, commissions and service fees.

        10.2.   Bundled Services. Telocity may offer bundled services from time
                to time that will be priced less than the aggregate price for
                all the component parts. In order to calculate the net revenues
                due NBCi for purposes of Section 10.1 based on the sale of the
                bundled Telocity Services, the parties will jointly determine
                the appropriate net revenue share for each item in the bundle,
                determine the ratio of the relative value of each item in the
                bundle based on the price of all items when purchased
                individually and apply such ratio to the revenue generated by
                the bundled offering. For example, assume a bundled Telocity
                Service package consisting of ten (10) discrete Telocity
                Services (seven (7) of which are Telocity Only Services and
                three (3) are Overlapping Services that meet the criteria of
                Section 5.5.2) costs a Subscriber One Hundred Dollars ($100) a
                month. Purchasing these ten (10) discrete Telocity Services
                individually would cost the Subscriber Two Hundred Dollars
                ($200) a month. If the three (3) Overlapping Services
                individually priced cost Fifty Dollars ($50) per month, the
                ratio would be twenty-five percent (25%) for the Overlapping
                Services. Therefore the net revenue share payable to NBCi by
                Telocity for the three (3) Overlapping Services would be 40% of
                25% of the net revenues for such $100 and the net revenue share
                payable to NBCi by Telocity for the 7 Telocity Only Services
                would be 10% of

                                       19
<PAGE>   20

                75% of the net revenues for such $100. NBCi shall have the
                right, exercisable in its reasonable discretion, to permit
                Telocity to bundle NBCi Services (such as pay-per-view movies)
                with Telocity Services; provided, however, that NBCi will have
                the right in its sole discretion to establish the price to
                Telocity for such bundled NBCi Services, and Telocity shall have
                the right in its sole discretion to price the overall bundle to
                the Subscriber.

        10.3.   Payment. Payments under this Agreement will be made by check or
                wire transfer of immediately available funds. All amounts due
                from one party to another party hereunder shall be due and
                payable [*] in which such amount can be reasonably accrued in
                accordance with generally accepted accounting principles.

        10.4.   Warrants. Upon execution of this Agreement, Telocity will issue
                to NBCi a warrant to purchase 1,039,122 shares of Series C
                Preferred Stock, in the form attached hereto as Exhibit G and,
                to NBC, a warrant to purchase 850,191 shares of Series C
                Preferred Stock, in the form attached hereto as Exhibit G.

11.     Records and Audits.

        11.1.   Accounting Standards. It is expressly understood and agreed by
                the parties that all computations relating to the determination
                of the amounts due and payable pursuant to this Agreement shall
                be made in accordance with nationally recognized and generally
                accepted accounting principles and practices that are recognized
                as such by the American Institute of Certified Public
                Accountants acting through its Accounting Principles Board or by
                the Financial Accounting Standards Board ("F.A.S.B.") or through
                other appropriate boards or committees thereof and shall be
                consistently applied for all periods after the Effective Date.
                The parties will recognize topline revenues related to this
                Agreement based generally upon principles for revenue
                recognition used by F.A.S.B. for accounting practices, and the
                SEC for reporting practices.

        11.2.   Audit Rights. Each party agrees to keep accurate books of
                account and records at its principal place of business covering
                all transactions relating to this Agreement. Each party or any
                duly authorized representative shall have the right, at all
                reasonable hours of the day, but no more than once a year, to
                audit, each of the other party's books of account and records
                and all other documents and material in the possession or under
                the control of such other party, whether in electronic format or
                otherwise, with respect to the subject matter and the terms of
                this Agreement and to make copies and extracts thereof; provided
                that no such audit may include any periods more than three years
                prior to the date of audit. In the event that any such audit
                reveals an underpayment by the audited party, the audited party
                shall immediately remit payment to appropriate party in the
                amount of such underpayment plus interest calculated at a rate
                of one and one-half (1 1/2%) per month, or the maximum rate
                allowed by law, compounded daily, calculated from the date such
                payments were actually due until the date when such payment is
                in fact actually made. Further, in the event that any such

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       20
<PAGE>   21
                underpayment is greater than [*] of the amount due for the
                period being audited, the audited party shall reimburse the
                party conducting the audit for the reasonable costs and expenses
                of such audit. All books of account and records of each party
                covering all transactions relating to this Agreement shall be
                retained by such party for at least three (3) years after the
                expiration or termination of this Agreement, as the case may be,
                for possible inspection and/or audit by the other parties.

12.     Term; Termination.

        12.1.   Term. The term of this Agreement will begin on the Effective
                Date and end on the last day of the fifteenth (15TH) year after
                the Effective Date, unless otherwise terminated as set forth in
                this Agreement (the "Term").

        12.2.   Termination for Cause. Either NBCi or Telocity may terminate
                this Agreement at any time by giving written notice of
                termination to the other party if any other party commits a
                material breach of its obligations hereunder, including a
                material breach of a relevant party's privacy policy, that is
                not cured within sixty (60) days after notice thereof from the
                non-breaching party.

        12.3.   Termination for Insolvency. Either party may terminate this
                Agreement upon sixty (60) days notice, and shall have no further
                obligation under this Agreement, if the other party becomes
                insolvent; makes an assignment for the benefit of creditors;
                makes or sends notice of a bulk transfer; calls a meeting of its
                creditors with respect to its inability to pay its obligations
                owed to such creditors on customary terms; defaults under any
                agreement, document or instrument relating to the party's
                indebtedness for borrowed money; or ceases to do business as a
                going concern; or if a petition is filed by or against the party
                under any bankruptcy or insolvency laws which is not dismissed
                within ninety (90) days of the date of filing.

        12.4.   Competitor Termination. NBCi may terminate this Agreement at any
                time by giving written notice of termination to Telocity if
                Telocity experiences a change in its ownership, such that an NBC
                Competitor (as defined in the Stock Purchase Agreement) or an
                NBCi Competitor, directly or indirectly, holds an equity
                interest greater than thirty-three (33) percent in Telocity, or
                otherwise acquires control of Telocity, or if Telocity is
                acquired by or merges with an NBCi Competitor. NBCi shall have
                the right to exercise the termination right set forth in this
                Section 12.4 for up to three (3) months after the occurrence of
                the event that triggered such a termination right.

        12.5.   Termination by NBCi. NBCi may terminate this Agreement at any
                time by giving written notice of termination to Telocity if
                within eighteen (18) months following the Effective Date,
                Telocity fails to complete a Qualifying Offering (as defined in
                Telocity's Third Amended and Restated Articles of Incorporation)
                or a private placement of its debt or equity securities (not
                including the private placement contemplated by the Stock
                Purchase Agreement) that results in net proceeds to

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       21
<PAGE>   22

                Telocity of an amount that will enable the continued expansion
                of the Subscriber base for the Telocity Platform at least fifty
                percent (50%) of the rates set forth with the Market Deployment
                Plan for a period of six (6) months following the closing of
                such Qualifying Offering or private placement, as applicable.

        12.6.   Consequences of Termination. Upon the termination or expiration
                of this Agreement, all licenses granted hereunder shall
                immediately terminate and each party shall return or destroy all
                Confidential Information of the other party in its possession.
                Neither party shall be liable to the other for damages of any
                sort resulting solely from any termination of this Agreement in
                accordance with its terms.

13.     Intellectual Property.

        13.1    Ownership.

                13.1.1  Telocity Materials. NBCi acknowledges that Telocity and
                        its licensors own and shall own all rights, title and
                        interest in the Telocity Marks, Telocity Content, the
                        Telocity Window and its specifications, Additional
                        Interfaces developed by Telocity without NBCi (except as
                        provided in Section 13.4), Telocity Sites, Proprietary
                        Technology (collectively referred to as "Telocity
                        Materials"). NBCi acknowledges that it has no, and shall
                        receive under this Agreement no, ownership rights in the
                        Telocity Materials. In the event NBCi or any of its
                        subsidiaries, by operation of law or otherwise obtains
                        any Intellectual Property Rights in the Telocity
                        Materials, NBCi shall, or cause its subsidiaries to,
                        irrevocably assign to Telocity and its successors and
                        assigns any of NBCi's or its subsidiaries' right, title
                        and interest thereto, including without limitation, any
                        and all worldwide copyrights and patent rights and all
                        renewals and extensions and divisionals, continuations
                        in part and foreign applications and registrations
                        thereof and for all uses and purposes whatsoever.

                13.1.2  NBCi Materials. Telocity acknowledges that NBCi, and its
                        licensors own and shall own all rights, title and
                        interest in the NBCi Marks, the NBCi Sites, Co-Branded
                        Site (except the Telocity Content contained therein),
                        the Front Door Interfaces, the specifications to such
                        Front Door Interfaces, the Additional Interfaces
                        developed by NBCi without Telocity (except as provided
                        in Section 13.4), and the specifications to such
                        Additional Interfaces (collectively referred to as "NBCi
                        Materials"). Telocity acknowledges that it has no, and
                        shall receive under this Agreement no, ownership rights
                        in the NBCi Materials. In the event Telocity by
                        operation of law or otherwise obtains any Intellectual
                        Property Rights in the NBCi Materials, Telocity shall
                        irrevocably assign to NBCi and its successors and
                        assigns of any and all of Telocity's right, title and
                        interest thereto, including without limitation any and
                        all worldwide copyrights and any and all renewals and
                        extensions thereof and for all uses and purposes
                        whatsoever.

                                       22
<PAGE>   23

                13.1.3  Jointly Developed Additional Interfaces. Except for (i)
                        Additional Interfaces developed by Telocity without
                        NBCi, (ii) Additional Interfaces developed by NBCi
                        without Telocity and (iii) Section 13.4, each party
                        acknowledges that the other party jointly owns all
                        jointly developed Additional Interfaces and all
                        specifications to such Additional Interfaces, and
                        neither party shall have an obligation of accounting to
                        the other with respect to such jointly developed
                        Additional Interfaces and specifications thereto.

        13.2    Telocity Marks and Content. Telocity hereby grants to NBCi and
                its subsidiaries a non-exclusive, non-transferable, royalty-free
                license, effective throughout the Term, (i) to use, display and
                publish the Telocity Marks and Telocity Content, and (ii)to
                modify and create derivative works of the Telocity Content,
                solely for purposes of rescaling. In the event the International
                Editions are deemed included within this Agreement pursuant to
                Section 8.2, Telocity hereby further grants to NBCi and its
                subsidiaries a non-exclusive, non-transferable, royalty-free
                license, effective throughout the Term, to modify and create
                derivative works of the Telocity Content solely as permitted
                hereunder. In the event the International Editions are deemed
                included within this Agreement pursuant to Section 8.2, Telocity
                shall in good faith modify the Telocity Marks to incorporate
                changes reasonably suggested by NBCi for the relevant target
                audience (e.g., complying with local laws or avoiding the use of
                offensive terms in the local language). Any use of the Telocity
                Marks by NBCi must comply with any reasonable usage guidelines
                communicated by Telocity to NBCi from time to time. Nothing
                contained in this Agreement will give NBCi any right, title or
                interest in or to the Telocity Content, Telocity Marks or the
                goodwill associated therewith, except for the limited usage
                rights expressly provided above. Telocity will have the right to
                approve all marketing materials used by NBCi that use the
                Telocity Marks in any way. NBCi acknowledges that Telocity is
                the sole and exclusive owner of the Telocity Marks. NBCi shall
                use Telocity Marks so that they create a separate and distinct
                impression from any other trademark that may be used on
                materials bearing the Telocity Marks. NBCi agrees that all use
                of the Telocity Marks by NBCi shall inure to the benefit of and
                be on behalf of Telocity and its licensors.

        13.3    Proprietary Technology. Telocity hereby grants NBCi and its
                subsidiaries (and, to the extent necessary for NBCi to perform
                hereunder, to subcontractors designated by NBCi, which are not
                Telocity Competitors) a non-exclusive, non-transferable
                royalty-free right and license during the Term to access and/or
                use the Proprietary Technology, including related documentation,
                methodology and tools, whether existing as of the Effective Date
                or developed by Telocity after the Effective Date, to enable
                NBCi to fulfill its obligations hereunder. Any subcontractors
                who receive a license under this provision shall first have
                signed a written agreement at least as protective of Telocity's
                rights as the terms and conditions of Section 20.4.

                                       23
<PAGE>   24

        13.4    Integration Technologies. Telocity acknowledges that NBCi and
                its licensors own and shall own all rights, title and interest
                in the technology used to integrate the Telocity Window into the
                Front Door Interfaces and that such technology shall constitute
                NBCi Materials for purposes of this Agreement; provided,
                however, if NBCi has to develop specific technology to integrate
                the Telocity Window into the Front Door Interfaces, then the
                parties shall jointly own such technology. If in designing and
                creating an Additional Interface, NBCi has to develop specific
                technology to design and create the Additional Interface, then
                the parties shall jointly own such technology. With respect to
                any such jointly owned technology neither party shall have an
                obligation to accounting to the other.

        13.5    NBCi's License Grants. NBCi hereby grants to Telocity a
                non-exclusive, non-transferable, royalty free license, effective
                throughout the Term, to use, display and publish the NBCi Marks
                as permitted in Section 7.2 and to use, reproduce and display
                the NBCi Marks in advertising, marketing and promotion of the
                Co-Branded Site, the Telocity Platform and the Telocity
                Services. Any use of the NBCi Marks by Telocity must comply with
                any reasonable editorial and usage guidelines communicated to
                Telocity by NBCi from time to time. Telocity shall submit for
                approval to NBCi, and NBCi shall have the sole right of approval
                over any uses of the NBCi Marks; provided that NBCi shall use
                the same standard of approval as it applies to any proposed use
                by NBCi or its subsidiaries and provided, further, that
                following approval of a particular format and purpose of use,
                Telocity shall be deemed to have continuing approval in the
                specific manner and for the format and purpose of use approved
                without the necessity of seeking specific approvals for each
                additional use. Nothing contained in this Agreement will give
                Telocity any right, title or interest in or to the NBCi Marks or
                the goodwill associated therewith, except for the limited usage
                rights expressly provided above. Telocity acknowledges and
                agrees that, as between Telocity and NBCi, NBCi or its licensors
                are the sole owners of all rights in and to the NBCi Marks. NBCi
                will have the right to approve all marketing materials used by
                Telocity that use the NBCi Marks in any way. Telocity agrees
                that all use of the NBCi Marks by Telocity shall inure to the
                benefit of and be on behalf of NBCi and its licensors.

        13.6    General Limitation. Neither party will use the other party's
                proprietary marks in a manner that disparages the other party or
                its products or services, or portrays the other party or its
                products or services in a false, competitively adverse or poor
                light. If a party is authorized to use the other party's
                proprietary marks, the party will comply with the other party's
                requests as to the use of the other party's proprietary marks
                and will avoid any action that diminishes the value of such
                marks. Either party's unauthorized use of the other's
                proprietary marks is strictly prohibited.

        13.7    General Reservation. Neither party grants any license to the
                other except as specifically set forth in this Section 13.
                Except as is expressly set forth under this

                                       24
<PAGE>   25

                Section 13, both parties expressly reserve all of their right,
                title and interest in their respective Intellectual Property
                Rights.

        13.8    Protection of Telocity Platform. Telocity agrees to use
                commercially reasonable efforts to protect the Telocity Platform
                through owning and/or licensing all Intellectual Property Rights
                therein and to use commercially reasonable efforts to maintain
                and enforce the same.

14.     Responsibility for the Sites and Products. Telocity acknowledges and
        agrees that, as between Telocity and NBCi, Telocity will be solely
        responsible for any claims or other losses associated with or resulting
        from the marketing or operation of the Telocity Platform and the
        Telocity Sites and the offer or sale of any Telocity Services by
        Telocity or through Telocity Sites or Co-Branded Site, or through emails
        delivered for Telocity by NBCi. NBCi acknowledges and agrees that, as
        between NBCi and Telocity, NBCi will be solely responsible for any
        claims or other losses associated with or resulting from the marketing
        or operation of the NBCi Properties and the NBCi Services and the offer
        or sale of any NBCi Services by Telocity or by NBCi.

15.     Telocity Representations and Warranties.

        15.1    Telocity represents and warrants: (i) Telocity possesses
                sufficient right, title, interest and license in or to all
                Intellectual Property Rights embodied in or used in connection
                with the Telocity Marks, the Telocity Content, the Telocity
                Platform, and the Telocity Site to perform its obligations
                hereunder; (ii) Telocity has full power and authority to grant
                the licenses in Sections 13.2 and 13.3 above; (iii) Telocity's
                use of the Co-Branded Site, the Telocity Platform and the
                Telocity Services pursuant to the license granted it in Section
                13.5 above shall in no way constitute an infringement or other
                violation of an Intellectual Property Right or any other right
                of any third party; and (iv) the execution of this Agreement by
                Telocity, and the performance by Telocity of its obligations and
                duties hereunder, do not and will not violate any agreement to
                which Telocity is a party or by which it is otherwise bound.

        15.2    EXCEPT AS EXPRESSLY SET FORTH IN SECTION 15.1 ABOVE, TELOCITY
                MAKES NO REPRESENTATIONS OR WARRANTIES, AND HEREBY SPECIFICALLY
                DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES, EXPRESS, IMPLIED OR
                STATUTORY, REGARDING THE TELOCITY CONTENT, TELOCITY MARKS,
                TELOCITY PLATFORM, TELOCITY SERVICES AND TELOCITY SITES,
                INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
                PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY RIGHTS AND
                IMPLIED WARRANTIES ARISING FROM COURSE OF DEALING OR COURSE OF
                PERFORMANCE, OR AS MAY BE SET FORTH IN EXHIBIT B.

16.     NBCi Representations and Warranties.

                                       25
<PAGE>   26

        16.1    NBCi represents and warrants to Telocity: (i) NBCi possesses
                sufficient right, title, interest and license in or to all
                Intellectual Property Rights (excluding rights to third party
                content, for example, user-generated content) embodied in or
                used in connection with the Front Door Interface and the
                Co-Branded Site to perform its obligations hereunder; (ii) NBCi
                has full power and authority to grant the licenses in Sections
                13.5 above; (iii) NBCi's use of the Telocity Marks, Telocity
                Content and Proprietary Technology pursuant to the license
                granted it in Sections 13.2 and 13.3 above shall in no way
                constitute an infringement or other violation of an Intellectual
                Property Right or any other right of any third party; and (iv)
                the execution of this Agreement by NBCi, and the performance by
                NBCi of its obligations and duties hereunder, do not and will
                not violate any agreement to which NBCi is a party or by which
                it is otherwise bound.

        16.2    EXCEPT AS EXPRESSLY SET FORTH IN SECTION 16.1 ABOVE, NBCi MAKES
                NO REPRESENTATIONS OR WARRANTIES, AND HEREBY SPECIFICALLY
                DISCLAIMS ANY REPRESENTATIONS OR WARRANTIES, EXPRESS, IMPLIED OR
                STATUTORY, REGARDING THE NBCi MARKS, NBCi PROPERTIES AND NBCi
                SERVICES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
                FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
                PARTY RIGHTS AND IMPLIED WARRANTIES ARISING FROM COURSE OF
                DEALING OR COURSE OF PERFORMANCE.

17.     LIMITATION OF DAMAGES. EXCEPT FOR SECTION 18, NO PARTY WILL BE LIABLE
        FOR ANY SPECIAL, INDIRECT, CONSEQUENTIAL OR INCIDENTAL DAMAGES ARISING
        OUT OF OR RELATED TO THIS AGREEMENT, HOWEVER CAUSED AND ON ANY THEORY OF
        LIABILITY (INCLUDING NEGLIGENCE), AND EVEN IF SUCH PARTY HAS BEEN
        ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

18.     Mutual Indemnification.

        18.1.   Indemnification by NBCi. NBCi shall indemnify, defend and hold
                Telocity and its officers, directors, employees and agents
                harmless from and against any costs, losses, liabilities and
                expenses, including all court costs, reasonable expenses and
                reasonable attorney's fees (collectively, "Losses") that
                Telocity may suffer, incur or be subjected to by reason of any
                legal action, proceeding, arbitration or other claim by a third
                party, whether commenced or threatened, arising out of or as a
                result of (i) the operation of the NBCi Properties, (ii) the
                transmission of emails or other solicitations by NBCi or any
                NBCi subsidiary to a Subscriber in violation of any applicable
                privacy policy or legislation or anti-spamming statutes, (iv)
                Telocity's use of the NBCi Marks in accordance with this
                Agreement, (v) any claim that the intellectual property of NBCi
                or any NBCi subsidiary infringes an Intellectual Property Right
                of any third party (except in cases where Telocity is required
                to indemnify NBCi under Section 18.2), and (vi) the use or
                disclosure of User Profile Data in violation of this Agreement
                or any applicable law or regulation.

                                       26
<PAGE>   27

        18.2.   Indemnification by Telocity. Telocity shall indemnify, defend
                and hold NBCi, and its Affiliates, officers, directors,
                employees and agents, harmless from and against any Losses that
                NBCi or its Affiliates may suffer, incur or be subjected to by
                reason of any legal action, proceeding, arbitration or other
                claim by a third party, whether commenced or threatened, arising
                out of or as a result of (i) the use of the Telocity Content,
                Telocity Marks or Proprietary Technology by NBCi and/or its
                Affiliates in accordance with this Agreement; (ii) the operation
                of the Telocity Sites or Telocity Platform; (iii) the offer or
                sale of Telocity Services by Telocity on or through Telocity
                Sites or the Co-Branded Site or any emails sent by NBCi or a
                third party pursuant to Section 9.3, (iv) any claim that the
                intellectual property of Telocity or any Telocity subsidiary or
                provided by Telocity hereunder (including the Proprietary
                Technology), Telocity Sites or Telocity Content infringes an
                Intellectual Property Right of any third party, (v) the use or
                disclosure of User Profile Data in violation of this Agreement
                or any applicable law or regulation, or (vi) the violation of
                any telecommunications laws, rules or regulations by Telocity.

        18.3.   Indemnification Procedures. If any party entitled to
                indemnification under this Section (an "Indemnified Party")
                makes an indemnification request to the other, the Indemnified
                Party shall permit the other party (the "Indemnifying Party") to
                control the defense, disposition or settlement of the matter at
                its own expense; provided that the Indemnifying Party shall not,
                without the consent of the Indemnified Party enter into any
                settlement or agree to any disposition that imposes an
                obligation on the Indemnified Party that is not wholly
                discharged or dischargeable by the Indemnifying Party, or
                imposes any conditions or obligations on the Indemnified Party
                other than the payment of monies that are readily measurable for
                purposes of determining the monetary indemnification or
                reimbursement obligations of Indemnifying Party. The Indemnified
                Party shall notify the Indemnifying Party promptly of any claim
                for which Indemnifying Party is responsible and shall cooperate
                with the Indemnifying Party in every commercially reasonable way
                to facilitate defense of any such claim; provided that the
                Indemnified Party's failure to notify Indemnifying Party shall
                not diminish Indemnifying Party's obligations under this Section
                except to the extent that Indemnifying Party is materially
                prejudiced as a result of such failure. An Indemnified Party
                shall at all times have the option to participate in any matter
                or litigation through counsel of its own selection and at its
                own expense.

19.     Alternative Dispute Resolution. Unless the parties otherwise agree in
        writing and except as qualified in Section 5.5.5, any dispute,
        controversy, disagreement or claim, regardless of the legal or equitable
        theory involved, arising out of or with reference to this Agreement
        (each, a "Dispute") shall be settled in accordance with the terms of
        this Section 19. Other than as expressly provided otherwise in this
        Agreement, the parties will act in good faith and use commercially
        reasonable efforts to resolve any Dispute between the parties or any of
        their respective subsidiaries under or related to this Agreement or any
        document executed pursuant to this Agreement or any of the transactions
        contemplated hereby within ten (10) days of notice by one party to the
        other of a specific dispute. Upon the expiration of such initial ten
        (10) day period, if a Dispute

                                       27
<PAGE>   28

        has not been resolved by the parties, the parties shall submit such
        Dispute to the parties' chief executive officers, who shall meet within
        an additional ten (10) day period to discuss the resolution of such
        Dispute in good faith. Such meeting shall continue for a minimum of two
        (2) business days, unless the dispute is resolved prior to the
        expiration of such two (2) day period. Except as provided in Section
        5.5.5, upon the expiration of the second ten (10) day period, if such
        Dispute remains unresolved, each party may seek any remedy available to
        it at law or otherwise. Neither party will seek, nor will be entitled to
        seek, outside resolution of the Dispute until after expiration of the
        second ten (10) day period.

20.     Miscellaneous.

        20.1.   Assignment. NBCi shall have the right to assign all of its
                rights and liabilities hereunder to an Affiliate or to any
                person or entity that (i) acquires all or substantially all of
                NBCi's operating assets (whether by asset sale, stock sale,
                merger or otherwise) or (ii) results from a merger or
                reorganization of NBCi pursuant to any plan of merger or
                reorganization. Telocity shall have the right to assign all of
                its rights and liabilities hereunder to any person or entity
                that (i) acquires all or substantially all of Telocity's
                operating assets (whether by asset sale, stock sale, merger or
                otherwise) or (ii) results from a merger or reorganization of
                Telocity pursuant to any plan of merger or reorganization;
                provided, however, that such person or entity is not an NBCi
                Competitor.

        20.2.   Relationship of Parties. This Agreement will not be construed to
                create a joint venture, partnership or the relationship of
                principal and agent between any of the parties hereto, nor to
                impose upon any party any obligations for any losses, debts or
                other obligations incurred by another party except as expressly
                set forth herein.

        20.3.   Applicable Law. This Agreement will be construed in accordance
                with and governed by the laws of the State of California,
                without regard to principles of conflicts of law. Litigation of
                disputes under this Agreement shall be conducted in the state or
                federal courts for the Northern District of California. The
                parties hereto consent to the jurisdiction of any local, state
                or federal court in which an action is commenced and located in
                accordance with the terms of this Section 20.3 and that is
                located in the Northern District of California. The parties
                further agree not to disturb such choice of forum, and if not
                residing in such state, waive the personal service of any and
                all process upon them, and consent that such service of process
                may be made by certified or registered mail, return receipt
                requested, addressed to the parties as set forth herein.

        20.4.   Confidentiality. In connection with the activities contemplated
                by this Agreement, each party may have access to confidential or
                proprietary technical or business information of another party,
                including without limitation (i) proposals, ideas or research
                related to possible new products or services; (ii) financial
                statements and other financial information; (iii) any reporting
                information in Section 11 herein; and (iv) the terms of this
                Agreement and the relationship among the parties; (collectively,
                "Confidential Information"). Each party will

                                       28
<PAGE>   29

                take reasonable precautions to protect the confidentiality of
                each of the other party's Confidential Information, which
                precautions will be at least equivalent to those taken by such
                party to protect its own Confidential Information. Except as
                required by law or as necessary to perform under this Agreement,
                no party will knowingly disclose the Confidential Information of
                any other party or use such Confidential Information for its own
                benefit or for the benefit of any third party. Each party's
                obligations in this Section with respect to any portion of
                another party's Confidential Information shall terminate when
                the party seeking to avoid its obligation under such Section can
                document that: (i) it was in the public domain at or subsequent
                to the time it was communicated to the receiving party
                ("Recipient") by the disclosing party ("Discloser") through no
                fault of Recipient; (ii) it was rightfully in Recipient's
                possession free of any obligation of confidence at or subsequent
                to the time it was communicated to Recipient by Discloser; (iii)
                it was developed by employees or agents of Recipient
                independently of and without reference to any information
                communicated to Recipient by Discloser; (iv) it was communicated
                by the Discloser to an unaffiliated third party free of any
                obligation of confidence; or (v) the communication was in
                response to a valid order by a court or other governmental body,
                was otherwise required by law or was necessary to establish the
                rights of either party under this Agreement.

        20.5.   Press Release. No party will make any public statement or other
                announcement (including without limitation, issuing a press
                release) or pre-briefing any member of the press or other third
                party) relating to the terms or existence of this Agreement
                without the prior written approval of the other parties.
                Notwithstanding the foregoing and Section 20.4, the parties
                shall issue an initial joint press release, the timing and
                wording of which will be subject to each party's reasonable
                approval (which shall not be unreasonably withheld or delayed),
                regarding the relationship between the parties.

        20.6.   Injunctive Relief. Each party agrees that in the event of a
                breach or alleged breach of Sections 20.4 or 20.5 above that the
                other parties shall not have an adequate remedy at law,
                including monetary damages, and that the other parties shall
                consequently be entitled to seek a temporary restraining order,
                injunction, or other form of equitable relief against the
                continuance of such breach, in addition to any and all remedies
                to which any other party shall be entitled.

        20.7.   Subsidiaries. Each party unconditionally guarantees to the other
                party the performance of all obligations by any of its
                subsidiaries under the Agreement (including, without limitation,
                payment obligations), as amended from time to time, or any other
                obligation of any subsidiary to the other party, now existing or
                hereafter arising. If either party's subsidiary does not perform
                such obligation, such party shall immediately perform such
                obligation.

        20.8.   Captions and Section Headings. Captions and section headings
                used in this Agreement are for convenience only and are not a
                part of this Agreement and shall not be used in construing it.

                                       29
<PAGE>   30

        20.9.   Survival. Termination or expiration of this Agreement for any
                reason shall not release any party from any liabilities or
                obligations set forth in this Agreement which (i) the parties
                have expressly agreed shall survive any such termination or
                expiration, or (ii) remain to be performed or by their nature
                would be intended to be applicable following any such
                termination or expiration.

        20.10.  Force Majeure. If any party shall be delayed in its performance
                of any obligation hereunder or be prevented entirely from
                performing any such obligation due to causes or events beyond
                its reasonable control, including without limitation any act of
                God, fire, strike or other labor problem, such delay or
                non-performance shall be excused and the time for performance
                shall be extended to include the period of such delay or
                non-performance.

        20.11.  Consents and Approvals. Except where expressly provided as being
                in the sole discretion of a party, where agreement, approval,
                acceptance, consent, confirmation, notice or similar action by
                either party is required under this Agreement, such action shall
                not be unreasonably delayed or withheld. An approval or consent
                given by a party under this Agreement shall not relieve the
                other party from responsibility for complying with the
                requirements of this Agreement, nor shall it be construed as a
                waiver of any rights under this Agreement, except as and to the
                extent otherwise expressly provided in such approval or consent.

        20.12.  Notices. All notices or other communications that shall or may
                be given pursuant to this Agreement, shall be in writing, in
                English, shall be sent by certified or registered air mail with
                postage prepaid, return receipt requested, by facsimile,
                overnight express mail, or by hand delivery. Such communications
                shall be deemed given and received upon confirmation of receipt,
                if sent by facsimile; the day after delivery if by overnight
                express mail; or upon delivery if hand delivered; or upon
                receipt of mailing, if sent by certified or registered mail; and
                shall be addressed to the parties as set forth above on the
                first page of this Agreement and to the attention of the Legal
                Department, with a Copy to the Office of the President, if to
                Telocity; and to the attention of the Legal Department, with a
                copy to the Office of the President, if to NBCi; or to such
                other addresses or persons as the parties may designate in
                writing from time to time.

        20.13.  Third Party Beneficiary. The parties hereto agree that NBC shall
                be a third party beneficiary of this Agreement for purposes of
                Section 4.15.

        20.14.  Counterparts. This Agreement may be executed in one or more
                counterparts, each of which shall be deemed a duplicate original
                and all of which, when taken together, shall constitute one and
                the same document.

        20.15.  Entire Agreement. This Agreement constitutes and contains the
                entire agreement between the parties with respect to the subject
                matter hereof and supersedes any prior or contemporaneous oral
                or written agreements. This Agreement may not be amended except
                in writing signed by all parties. Each party acknowledges and

                                       30
<PAGE>   31

                agrees that the other has not made any representations,
                warranties or agreements of any kind, except as expressly set
                forth herein. All exhibits attached to this Agreement are
                incorporated hereby and shall be treated as if set forth herein.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed by
their duly authorized representatives on the dates indicated below.

NBC INTERNET, INC.                      TELOCITY, INC.

By: /s/ EDMOND SANCTIS                  By: /s/ PATTI HART
   ----------------------------------      ----------------------------------
   (Signature)                             (Signature)

Name: Edmond Sanctis                    Name: Patti Hart
     --------------------------------        --------------------------------
     (Please print)                          (Please print)

Title:                                  Title:
      -------------------------------         -------------------------------

Date:                                   Date:
     --------------------------------        --------------------------------

FOR PURPOSES OF SECTION 4.14 AND 10.4:

NATIONAL BROADCASTING COMPANY, INC.

By: /s AUTHORIZED SIGNATORY
   ----------------------------------
   (Signature)

Name: Authorized Officer
     --------------------------------
     (Please print)

Title:
      -------------------------------

Date:
     --------------------------------

                                       31
<PAGE>   32

                                    EXHIBIT A

                           [INTENTIONALLY LEFT BLANK]

                                       32
<PAGE>   33

                                    EXHIBIT B

                              OSS, NETWORK, GATEWAY

OSS

     Telocity's back-end operational system is a customer focused web-enabled
business process that ties together all of the Company's functional departments
including sales, customer service, marketing, billing, accounting, line
qualification and order fulfillment. It is technically based on a best-of-breed
approach utilizing standard products for customer relationship management,
billing, for network monitoring and order processing. Using Telocity's automated
back office process, customers can self-subscribe for service without requiring
interaction. Once an order has been placed, the customer information is
populated in real-time to information technology systems within the Company.
After the customer completes the automated line test to determine if the phone
line qualifies for the broadband service, the Telocity back office system can
handle order provisioning for the central office cross connect. Simultaneously,
Telocity's residential gateway modem is automatically sent to the customer. With
these internal information systems, Telocity is able to retrieve real-time order
status, customer and financial information.

     Telocity's OSS design is based on "best-of-breed" approach. The Company has
selected the best packages from order entry to billing and integrated them with
the customer as the focus point. [*].

NETWORK

     The Company is in the process of deploying a high performance network
IP-based network backbone starting at OC-3 capacity.

The Telocity network features the following:

o    A nationwide, managed delivery platform for broadband content, based on
     open Internet standards, with QoS between consumers and partners, including
     local caching, proxy and media server support. Four levels of QoS from
     Internet access to voice based quality.

o    Peering and transit arrangements with major backbone partners

o    Local media distribution centers with caching via satellite feed and local
     media servers for high speed distribution. Extensible to support new
     caching mechanism and media distribution schemas.

o    IP-protocol based high-speed connectivity to the Internet and to Telocity's
     nationwide backbone for partners, supporting various carrier mechanisms
     from ATM, xDSL up to point-to-point high-speed circuits.

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       33
<PAGE>   34

     The Company has negotiated agreements for long-haul capacity from national
carriers to form the basis of its nationwide backbone. In addition, the Company
has executed last-mile interconnection agreements with major last mile
providers.

     Telocity's network and OSS are managed and monitored on a 24x7 basis. The
Company's network operations center is located in Cupertino, California. From
this center, Telocity provides end-to-end network monitoring and management
using advanced network management tools 24 hours a day, 7 days a week. This
enhances Telocity's ability to address performance issues before they affect the
end-user experience and allows the Company to remotely install and/or upgrade a
customer's requested suite of products. During first half of 2000, Telocity
intends to establish a back-up data center in a low cost region within the
United States. The network operations center, customer service center and the
data center have a back-up generator and a battery back-up.

GATEWAY

     Telocity's residential gateway, which includes the DSL modem, provides for
a simple installation. Once a phone line has been DSL activated in the home, the
residential gateway is shipped to the customer. It does not require installation
of any special cards in the computer or require a site visit by a computer
technician. To activate the DSL service, the customer simply plugs a phone line
into the modem, plugs the modem into the back of the computer and then follows
the automated instructions on the computer screen.

     The simplicity behind Telocity's next-generation broadband services is
embodied in its intelligent device called the Telocity residential gateway. The
device combines a DSL modem, an analog modem and a microprocessor unit that
automates installation, customer support and service upgrades. The residential
gateway is a small standalone unit that operates independent of the user's
computer's operating system and does not require a network interface card to be
installed in the computer. As a result, the always-on Internet connection of the
DSL service remains in operation even if the computer crashes or shuts down. The
gateway and Telocity's integrated back office system combine to fully automate
installing, configuring, and upgrading service, including service level upgrades
and the addition of new features and services.

Key benefits of the residential gateway design include:

o    Automated broadband residential gateway

o    Advanced application and service offerings through automated software
     downloading

o    Interoperability with industry standard DSLAMs for ADSL, SDSL and G.Lite

o    Intelligence to download the necessary software to support future advanced
     applications

o    Flexible PC connectivity with universal Parallel, Ethernet and USB ports

o    Speeds scale from 320 Kbps to 1.1 Mbps for SDSL, and up to 8 Mbps for ADSL

The Company expects to extend services throughout the home with the following
features:

                                       34
<PAGE>   35

o    Home networking through the existing telephone wire

o    Wireless home connectivity

o    Automation through X10 integration

                                       35
<PAGE>   36

                                    EXHIBIT C

[*]

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       36
<PAGE>   37

                                    EXHIBIT D

                              TELOCITY COMPETITORS

[*]

[*] The Registrant has requested confidential treatment for certain portions of
    this exhibit. The omitted portions have been separately filed with the
    Commission.

                                       37
<PAGE>   38

                                    EXHIBIT E

                           [INTENTIONALLY LEFT BLANK]

                                       38
<PAGE>   39

                                    EXHIBIT F

                                      TEAMS

The parties shall mutually agree in writing on the contents of this Exhibit F
within thirty (30) days of the Effective Date of the Agreement.

                                       39
<PAGE>   40

                                    EXHIBIT G

                                FORM OF WARRANTS

                                       40
<PAGE>   41
THE SECURITIES EVIDENCED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED
UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH
SECURITIES, THE SALE IS MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR THE
COMPANY RECEIVES AN OPINION OF COUNSEL FOR THE HOLDER OF SUCH SECURITIES
REASONABLY SATISFACTORY TO THE COMPANY STATING THAT SUCH SALE, TRANSFER,
ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS
DELIVERY REQUIREMENTS OF SUCH ACT.

No.____________

                       WARRANT TO PURCHASE PREFERRED STOCK
                                       of
                                 TELOCITY, INC.

                         (void after December 13, 2004)

        1. Number of Shares Subject to Warrant. FOR VALUE RECEIVED, on and after
the Commencement Date (as defined below), and subject to the terms and
conditions herein set forth, the Holder (as defined below) is entitled to
purchase from Telocity, Inc., a California corporation (the "Company"), at any
time before 5:00 p.m. California time on December 13, 2004 ("Termination Date"),
at a price per share equal to the Warrant Price (as defined below), the Warrant
Stock (as defined below and subject to adjustments as described below) upon
exercise of this Warrant pursuant to Section 6 hereof.

        2. Definitions. As used in this Warrant, the following terms shall have
the definitions ascribed to them below:

               a. "Commencement Date" shall mean December 13, 1999.

               b. "Holder" shall mean NBC Internet, Inc.

               c. "Securities" shall mean fully paid and non-assessable shares
of Series C Preferred Stock of the Company, or after an initial public offering
in which all outstanding shares of Preferred Stock convert into Common Stock,
Common Stock of the Company.

               d. "Warrant Price" shall be equal to $5.24 per share.

               e. "Warrant Stock" shall mean the Securities purchasable upon
exercise of this Warrant or issuable upon conversion of this Warrant. The total
number of shares to be issued upon exercise of the Warrant, subject to
adjustment as described in Section 3 below, shall equal 1,039,122 shares.

        2. Adjustments and Notices. The Warrant Price shall be subject to
adjustment from time to time in accordance with the following provisions:

<PAGE>   42

               a. Subdivision, Stock Dividends or Combinations. In case the
Company shall at any time subdivide the outstanding shares of the Securities or
shall issue a stock dividend with respect to the Securities, the Warrant Price
in effect immediately prior to such subdivision or the issuance of such dividend
shall be proportionately decreased, and in case the Company shall at any time
combine the outstanding shares of the Securities, the Warrant Price in effect
immediately prior to such combination shall be proportionately increased,
effective at the close of business on the date of such subdivision, dividend or
combination, as the case may be.

               b. Reclassification, Exchange, Substitution, In-Kind
Distribution. Upon any reclassifications, exchange, substitution, or other event
that results in a change of the number and/or class of the securities issuable
upon exercise or conversion of this Warrant or upon the payment of a dividend in
securities or property other than Securities, the Holder shall be entitled to
receive, upon exercise or conversion of this Warrant, the number and kind of
securities and property that the Holder would have received for the Securities
if this Warrant had been exercised immediately before the record date for such
reclassification, exchange, substitution, or other event or immediately prior to
the record date for such dividend. The Company or its successor shall promptly
issue to the Holder a new Warrant for such new securities or other property. The
new Warrant shall provide for adjustments which shall be as nearly equivalent as
may be practicable to the adjustments provided for in this Section 3 including,
without limitation, adjustments to the Warrant Price and to the number of
securities or property issuable upon exercise of the new Warrant. The provisions
of this Section 3(b) shall similarly apply to successive reclassifications,
exchanges, substitutions, or other events and successive dividends.

               c. Reorganization, Merger etc. In case of any merger or
consolidation of the Company into or with another corporation, the Company, or
such successor or purchasing corporation, as the case may be, shall, as a
condition to closing any such reorganization, merger or sale, duly execute and
deliver to the Holder hereof a new warrant so that the Holder shall have the
right to receive, at a total purchase price not to exceed that payable upon the
exercise of the unexercised portion of this Warrant, and in lieu of the shares
of the Securities theretofore issuable upon exercise of this Warrant, the kind
and amount of shares of stock, other securities, money and property receivable
upon such reorganization, merger or sale by the Holder of the number of shares
of Securities then purchasable under this Warrant. Such new warrant shall
provide for adjustments that shall be as nearly equivalent as may be practicable
to the adjustments provided for in this Section 3. The provisions of this
subparagraph (c) shall similarly apply to successive reorganizations, mergers
and sales.

               d. No Impairment. The Company shall not, by amendment of its
Articles of Incorporation or through a reorganization, transfer of assets,
consolidation, merger, dissolution, issue, or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed under this Warrant by the Company, but
shall at all times in good faith assist in carrying out of all the provisions of
this Section 3 and in taking all such action as may be necessary or appropriate
to protect the Holder's rights under this Section 3 against impairment. If the
Company takes any action affecting the Securities other than as described above
that adversely affects the Holder's rights under this Warrant, the Warrant Price
shall be adjusted downward by an amount equal to the diminution in value of the
Warrant (including any unrealized gain) as a result of such action.

<PAGE>   43

               e. Notice. Upon any adjustment of the Warrant Price and any
increase or decrease in the number of shares of the Securities purchasable upon
the exercise or conversion of this Warrant, then, and in each such case, the
Company, as promptly as practicable thereafter, shall give written notice
thereof to the Holder of this Warrant at the address of such Holder as shown on
the books of the Company which notice shall state the Warrant Price as adjusted
and the increased or decreased number of shares purchasable upon the exercise or
conversion of this Warrant, setting forth in reasonable detail the method of
calculation of each. The Company further agrees to notify the Holder of this
Warrant in writing of a reorganization, merger or sale in accordance with
Section 3(c) hereof at least forty-five (45) days prior to the effective date
thereof. The Company also agrees to notify the Holder of this Warrant in writing
of a proposed public offering at least thirty (30) days prior to the effective
date thereof.

               f. Fractional Shares. No fractional shares shall be issuable upon
exercise or conversion of the Warrant and the number of shares to be issued
shall be rounded to the nearest whole share.

        3. No Shareholder Rights. This Warrant, by itself, as distinguished from
any shares purchased hereunder, shall not entitle its Holder to any of the
rights of a shareholder of the Company.

        4. Reservation of Stock; Taxes.

               a. On and after the Commencement Date, the Company will reserve
from its authorized and unissued Securities a sufficient number of shares to
provide for the issuance of Warrant Stock upon the exercise or conversion of
this Warrant and shall reserve from its authorized and unissued Common Stock a
sufficient number of shares to provide for the issuance of Common Stock upon the
conversion of the Warrant Stock. Issuance of this Warrant shall constitute full
authority to the Company's officers who are charged with the duty of executing
stock certificates to execute and issue the necessary certificates for shares of
Warrant Stock issuable upon the exercise or conversion of this Warrant.

               b. The Company covenants that all Securities that may be issued
upon the exercise of rights represented by this Warrant will, upon exercise, be
fully paid and nonassessable and free from all taxes, liens and charges in
respect of the issue (other than taxes in respect of any transfer occurring
contemporaneously with such issue). The Company shall pay any and all United
States federal, state and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of the certificates
representing Securities issued hereunder.

        5. Exercise of Warrant. This Warrant may be exercised in whole or part
by the Holder, at any time after the date hereof prior to the termination of
this Warrant, by the surrender of this Warrant, together with the Notice of
Exercise and Investment Representation Statement in the forms attached hereto as
Attachments 1 and 2, respectively, duly completed and executed at the principal
office of the Company, specifying the portion of the Warrant to be exercised and
accompanied by payment in full of the Warrant Price in cash or by check with
respect to the shares of Warrant Stock being purchased. This Warrant shall be
deemed to have been exercised immediately prior to the close of business on the
date of its surrender for exercise as provided

<PAGE>   44

above, and the person entitled to receive the shares of Warrant Stock issuable
upon such exercise shall be treated for all purposes as Holder of such shares of
record as of the close of business on such date. As promptly as practicable
after such date (but no later than fifteen (15) days after such date), the
Company shall issue and deliver to the person or persons entitled to receive the
same a certificate or certificates for the number of full shares of Warrant
Stock issuable upon such exercise. If the Warrant shall be exercised for less
than the total number of shares of Warrant Stock then issuable upon exercise,
promptly after surrender of the Warrant upon such exercise (but no later than
fifteen (15) days after such surrender), the Company will execute and deliver a
new Warrant, dated the date hereof, evidencing the right of the Holder to the
balance of the Warrant Stock purchasable hereunder upon the same terms and
conditions set forth herein.

        6. Conversion.

               a. In lieu of exercising this Warrant or any portion hereof, the
Holder hereof shall have the right to convert this Warrant or any portion hereof
into Warrant Stock by executing and delivering to the Company at its principal
office the written Notice of Conversion and Investment Representation Statement
in the forms attached hereto as Attachments 2 and 3, specifying the portion of
the Warrant to be converted, and accompanied by this Warrant. The number of
shares of Warrant Stock to be issued to the Holder upon such conversion shall be
computed using the following formula:

                                X = (P)(Y)(A-B)/A

where                 X =    the number of shares of Securities to be issued to
                             the Holder for the portion of the Warrant being
                             converted.

                      P =    the portion of the Warrant being converted
                             expressed as a decimal fraction.

                      Y =    the total number of shares of Securities issuable
                             upon exercise of the Warrant in full.

                      A =    the Fair Market Value of one share of Warrant
                             Stock.

                      B =    the Warrant Price on the date of conversion.

               b. For purposes of this Section 6, "Fair Market Value" shall
mean:

                      (i) the closing price of shares of the Company's common
               stock quoted on the Nasdaq National Market or the closing price
               quoted on any exchange on which such shares are listed, whichever
               is applicable, on the trading day immediately preceding the date
               of delivery of the notices pursuant to this Section 3 (it being
               understood that the original Warrant may be surrendered on the
               subsequent day if such original Warrant is provided to an
               overnight courier service (eg, Federal Express) on the date of
               delivery of such notices), or

                      (ii) if the Company's common stock is not listed on the
               Nasdaq National Market or on an exchange, the fair market value
               of one share of common

<PAGE>   45

               stock as determined in good faith by the Company's Board of
               Directors.; provided, however, that if the Holder shall dispute
               the market price as determined by the Board, the Holder and the
               Company may retain an independent expert mutually agreed upon in
               good faith by the Holder and the Board (an "Independent Expert").
               The determination of market price by the Independent Expert shall
               be final, binding and conclusive on the Company and the Holder.
               All costs and expenses of the Independent Expert shall be borne
               by the Holder unless the determination of fair market value is
               more favorable to such Holder by 5% or more, in which case, all
               such costs and expenses shall be borne by the Company.

               c. Any portion of this Warrant that is converted shall be
immediately canceled. This Warrant or any portion hereof shall be deemed to have
been converted immediately prior to the close of business on the date of its
surrender for conversion as provided above, and the person entitled to receive
the shares of Warrant Stock issuable upon such conversion shall be treated for
all purposes as the Holder of such shares of record as of the close of business
on such date. As promptly as practicable after such date (but no later than
fifteen (15) days after such date), the Company shall issue and deliver to the
person or persons entitled to receive the same a certificate or certificates for
the number of full shares of Warrant Stock issuable upon such conversion. If the
Warrant shall be converted for less than the total number of shares of Warrant
Stock then issuable upon conversion, promptly after surrender of the Warrant
upon such conversion (but no later than fifteen (15) days after such surrender),
the Company will execute and deliver a new Warrant, dated the date hereof,
evidencing the right of the Holder to the balance of the Warrant Stock
purchasable hereunder upon the same terms and conditions set forth herein.
Notwithstanding anything to the contrary contained herein, the Holder may elect
to receive a net issuance of Securities pursuant to this Section 6 when
converting this Warrant in part.

        7. Transfer of Warrant. This Warrant may be transferred or assigned by
the Holder hereof in whole or in part to an affiliate of the Holder if (i) the
transferee agrees in writing to be subject to the terms of this Warrant; and
(ii) the transferee delivers written notice of such transfer to the Company.
Upon any partial transfer, the Company will at its expense issue and deliver to
the Holder a new Warrant of like tenor, in the name of the Holder, which shall
be exercisable for such number of Securities that were not so transferred.

        8. Representations and Warranties. The Company hereby makes all the
representations and warranties set forth in Section 3 of the Series C Preferred
Stock Purchase Agreement dated as of the date hereof among the Company, the
Holder and certain other investors (the "Series C Preferred Stock Purchase
Agreement"). The Holder hereby makes all the representations and warranties set
forth in Section 4 of the Series C Preferred Stock Purchase Agreement.

        9. Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt by
the Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
surrender and cancellation of this Warrant, if mutilated, the Company will make
and deliver a new Warrant of like tenor and dated as of such cancellation or
delivery, in lieu of this Warrant.

<PAGE>   46

        10. Saturdays, Sundays, Holidays, etc. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday or a Sunday or shall be a legal holiday in San
Francisco, California, then such action may be taken or such right may be
exercised on the next succeeding day not a legal holiday in San Francisco,
California.

        11. Termination. This Warrant shall terminate on 5:00 p.m. California
time on the Termination Date.

        12. Miscellaneous. This Warrant shall be governed by the laws of the
State of California, as such laws are applied to contracts to be entered into
and performed entirely in California. The headings in this Warrant are for
purposes of convenience and reference only, and shall not be deemed to
constitute a part hereof. Neither this Warrant nor any term hereof may be
changed or waived orally, but only by an instrument in writing signed by the
Company and the Holder of this Warrant. The terms and provisions of this Warrant
shall inure to the benefit of, and be binding upon, the Company, the Holder and
their respective successors and assigns. All notices and other communications
from the Company to the Holder of this Warrant shall be delivered personally or
mailed by first class mail, postage prepaid, to the address furnished to the
Company by the Holder in the Series C Preferred Stock Purchase Agreement, or to
such other address as the Holder or any transferee or assignee thereof shall
have furnished to the Company in writing, and if mailed shall be deemed given
three days after deposit in the United States mail.

        ISSUED:December 13, 1999

                                        TELOCITY, INC.

                                        By:
                                           -------------------------------------
                                             Patti Hart, President

<PAGE>   47

                                  Attachment 1

                               NOTICE OF EXERCISE

TO:     TELOCITY, INC.

        1. The undersigned hereby elects to purchase shares of the Warrant Stock
of Telocity, Inc. pursuant to the terms of the attached Warrant, and tenders
herewith payment of the purchase price in full.

        2. Please issue a certificate or certificates representing said shares
of Warrant Stock in the name of the undersigned or in such other name as is
specified below:

                    ----------------------------------------
                                     (Name)

                    ----------------------------------------
                                    (Address)

-------------------------               ----------------------------------------
(Date)                                  (Name of Warrant Holder)

                                        By:
                                            ------------------------------------

                                        Title:
                                              ----------------------------------

<PAGE>   48

                                  Attachment 2

                       INVESTMENT REPRESENTATION STATEMENT

                            Shares of the Securities
                     (as defined in the attached Warrant) of
                                 TELOCITY, INC.

        In connection with the purchase of the above-listed securities, the
undersigned hereby represents to Telocity, Inc. (the "Company") as follows:

        (a) The securities to be received upon the exercise of the Warrant (the
"Securities") will be acquired for investment for its own account, not as a
nominee or agent, and not with a view to the sale or distribution of any part
thereof, and the undersigned has no present intention of selling, granting
participation in or otherwise distributing the same, but subject, nevertheless,
to any requirement of law that the disposition of its property shall at all
times be within its control. By executing this Statement, the undersigned
further represents that it does not have any contract, undertaking, agreement or
arrangement with any person to sell, transfer, or grant participations to such
person or to any third person, with respect to any Securities issuable upon
exercise of the Warrant.

        (b) The undersigned understands that the Securities issuable upon
exercise of the Warrant at the time of issuance may not be registered under the
Securities Act of 1933, as amended (the "Act"), and applicable state securities
laws, on the ground that the issuance of such securities is exempt pursuant to
Section 4(2) of the Act and state law exemptions relating to offers and sales
not by means of a public offering, and that the Company's reliance on such
exemptions is predicated on the undersigned's representations set forth herein.

        (c) Except for a transfer by the undersigned, in the event the
undersigned is a partnership, to a limited or general partner of such
partnership, the undersigned agrees that in no event will it make a disposition
of any Securities acquired upon the exercise of the Warrant unless and until (i)
it shall have notified the Company of the proposed disposition, and (ii) it
shall have furnished the Company with an opinion of counsel reasonably
satisfactory to the Company and Company's counsel to the effect that (A)
appropriate action necessary for compliance with the Act and any applicable
state securities laws has been taken or an exemption from the registration
requirements of the Act and such laws is available, and (B) the proposed
transfer will not violate any of said laws. Notwithstanding the foregoing, no
opinion of counsel shall be required for any transfer to an affiliate (as such
term is defined in Rule 405 of the Act) of the undersigned.

        (d) The undersigned acknowledges that an investment in the Company is
highly speculative and represents that it is able to fend for itself in the
transactions contemplated by this Statement, has such knowledge and experience
in financial and business matters as to be capable of evaluating the merits and
risks of its investments, and has the ability to bear the economic risks
(including the risk of a total loss) of its investment. The undersigned
represents that it has had the opportunity to ask questions of the Company
concerning the Company's business and assets and to obtain any additional
information which it considered necessary to verify the

<PAGE>   49

accuracy of or to amplify the Company's disclosures, and has had all questions
which have been asked by it satisfactorily answered by the Company.

        (e) The undersigned acknowledges that the Securities issuable upon
exercise of the Warrant must be held indefinitely unless subsequently registered
under the Act or an exemption from such registration is available. The
undersigned is aware of the provisions of Rule 144 promulgated under the Act
which permit limited resale of shares purchased in a private placement subject
to the satisfaction of certain conditions, including, among other things, the
existence of a public market for the shares, the availability of certain current
public information about the Company, the resale occurring not less than one
year after a party has purchased and paid for the security to be sold, the sale
being through a "broker's transaction" or in transactions directly with a
"market makers" (as provided by Rule 144(f)) and the number of shares being sold
during any three-month period not exceeding specified limitations.

        Dated:
              ----------------------

                                        ----------------------------------------
                                        (Typed or Printed Name)

                                        By:
                                           -------------------------------------
                                             (Signature)

                                        ----------------------------------------
                                        (Title)

<PAGE>   50

                                  Attachment 3

                              NOTICE OF CONVERSION

TO:     TELOCITY, INC.

        1. The undersigned hereby elects to acquire shares of the Securities of
Telocity, Inc. pursuant to the terms of the attached Warrant, by conversion of
percent ( %) of the Warrant.

        2. Please issue a certificate or certificates representing said shares
of Securities in the name of the undersigned or in such other name as is
specified below:

                    ----------------------------------------
                                     (Name)

                    ----------------------------------------
                                    (Address)

-------------------------               ----------------------------------------
(Date)                                  (Name of Warrant Holder)

                                        By:
                                            ------------------------------------

                                        Title:
                                              ----------------------------------

<PAGE>   51

THE SECURITIES EVIDENCED BY THIS WARRANT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED
UNLESS THERE IS AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT COVERING SUCH
SECURITIES, THE SALE IS MADE IN ACCORDANCE WITH RULE 144 UNDER THE ACT, OR THE
COMPANY RECEIVES AN OPINION OF COUNSEL FOR THE HOLDER OF SUCH SECURITIES
REASONABLY SATISFACTORY TO THE COMPANY STATING THAT SUCH SALE, TRANSFER,
ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS
DELIVERY REQUIREMENTS OF SUCH ACT.

No.____________

                       WARRANT TO PURCHASE PREFERRED STOCK
                                       of
                                 TELOCITY, INC.

                         (void after December 13, 2004)

        1. Number of Shares Subject to Warrant. FOR VALUE RECEIVED, on and after
the Commencement Date (as defined below), and subject to the terms and
conditions herein set forth, the Holder (as defined below) is entitled to
purchase from Telocity, Inc., a California corporation (the "Company"), at any
time before 5:00 p.m. California time on December 13, 2004 ("Termination Date"),
at a price per share equal to the Warrant Price (as defined below), the Warrant
Stock (as defined below and subject to adjustments as described below) upon
exercise of this Warrant pursuant to Section 6 hereof.

        2. Definitions. As used in this Warrant, the following terms shall have
the definitions ascribed to them below:

               a. "Commencement Date" shall mean December 13, 1999.

               b. "Holder" shall mean National Broadcasting Company, Inc.

               c. "Securities" shall mean fully paid and non-assessable shares
of Series C Preferred Stock of the Company, or after an initial public offering
in which all outstanding shares of Preferred Stock convert into Common Stock,
Common Stock of the Company.

               d. "Warrant Price" shall be equal to $5.24 per share.

               e. "Warrant Stock" shall mean the Securities purchasable upon
exercise of this Warrant or issuable upon conversion of this Warrant. The total
number of shares to be issued upon exercise of the Warrant, subject to
adjustment as described in Section 3 below, shall equal 850,191 shares.

        2. Adjustments and Notices. The Warrant Price shall be subject to
adjustment from time to time in accordance with the following provisions:

<PAGE>   52

               a. Subdivision, Stock Dividends or Combinations. In case the
Company shall at any time subdivide the outstanding shares of the Securities or
shall issue a stock dividend with respect to the Securities, the Warrant Price
in effect immediately prior to such subdivision or the issuance of such dividend
shall be proportionately decreased, and in case the Company shall at any time
combine the outstanding shares of the Securities, the Warrant Price in effect
immediately prior to such combination shall be proportionately increased,
effective at the close of business on the date of such subdivision, dividend or
combination, as the case may be.

               b. Reclassification, Exchange, Substitution, In-Kind
Distribution. Upon any reclassifications, exchange, substitution, or other event
that results in a change of the number and/or class of the securities issuable
upon exercise or conversion of this Warrant or upon the payment of a dividend in
securities or property other than Securities, the Holder shall be entitled to
receive, upon exercise or conversion of this Warrant, the number and kind of
securities and property that the Holder would have received for the Securities
if this Warrant had been exercised immediately before the record date for such
reclassification, exchange, substitution, or other event or immediately prior to
the record date for such dividend. The Company or its successor shall promptly
issue to the Holder a new Warrant for such new securities or other property. The
new Warrant shall provide for adjustments which shall be as nearly equivalent as
may be practicable to the adjustments provided for in this Section 3 including,
without limitation, adjustments to the Warrant Price and to the number of
securities or property issuable upon exercise of the new Warrant. The provisions
of this Section 3(b) shall similarly apply to successive reclassifications,
exchanges, substitutions, or other events and successive dividends.

               c. Reorganization, Merger etc. In case of any merger or
consolidation of the Company into or with another corporation, the Company, or
such successor or purchasing corporation, as the case may be, shall, as a
condition to closing any such reorganization, merger or sale, duly execute and
deliver to the Holder hereof a new warrant so that the Holder shall have the
right to receive, at a total purchase price not to exceed that payable upon the
exercise of the unexercised portion of this Warrant, and in lieu of the shares
of the Securities theretofore issuable upon exercise of this Warrant, the kind
and amount of shares of stock, other securities, money and property receivable
upon such reorganization, merger or sale by the Holder of the number of shares
of Securities then purchasable under this Warrant. Such new warrant shall
provide for adjustments that shall be as nearly equivalent as may be practicable
to the adjustments provided for in this Section 3. The provisions of this
subparagraph (c) shall similarly apply to successive reorganizations, mergers
and sales.

               d. No Impairment. The Company shall not, by amendment of its
Articles of Incorporation or through a reorganization, transfer of assets,
consolidation, merger, dissolution, issue, or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed under this Warrant by the Company, but
shall at all times in good faith assist in carrying out of all the provisions of
this Section 3 and in taking all such action as may be necessary or appropriate
to protect the Holder's rights under this Section 3 against impairment. If the
Company takes any action affecting the Securities other than as described above
that adversely affects the Holder's rights under this Warrant, the Warrant Price
shall be adjusted downward by an amount equal to the diminution in value of the
Warrant (including any unrealized gain) as a result of such action.

<PAGE>   53

               e. Notice. Upon any adjustment of the Warrant Price and any
increase or decrease in the number of shares of the Securities purchasable upon
the exercise or conversion of this Warrant, then, and in each such case, the
Company, as promptly as practicable thereafter, shall give written notice
thereof to the Holder of this Warrant at the address of such Holder as shown on
the books of the Company which notice shall state the Warrant Price as adjusted
and the increased or decreased number of shares purchasable upon the exercise or
conversion of this Warrant, setting forth in reasonable detail the method of
calculation of each. The Company further agrees to notify the Holder of this
Warrant in writing of a reorganization, merger or sale in accordance with
Section 3(c) hereof at least forty-five (45) days prior to the effective date
thereof. The Company also agrees to notify the Holder of this Warrant in writing
of a proposed public offering at least thirty (30) days prior to the effective
date thereof.

               f. Fractional Shares. No fractional shares shall be issuable upon
exercise or conversion of the Warrant and the number of shares to be issued
shall be rounded to the nearest whole share.

        3. No Shareholder Rights. This Warrant, by itself, as distinguished from
any shares purchased hereunder, shall not entitle its Holder to any of the
rights of a shareholder of the Company.

        4. Reservation of Stock; Taxes.

               a. On and after the Commencement Date, the Company will reserve
from its authorized and unissued Securities a sufficient number of shares to
provide for the issuance of Warrant Stock upon the exercise or conversion of
this Warrant and shall reserve from its authorized and unissued Common Stock a
sufficient number of shares to provide for the issuance of Common Stock upon the
conversion of the Warrant Stock. Issuance of this Warrant shall constitute full
authority to the Company's officers who are charged with the duty of executing
stock certificates to execute and issue the necessary certificates for shares of
Warrant Stock issuable upon the exercise or conversion of this Warrant.

               b. The Company covenants that all Securities that may be issued
upon the exercise of rights represented by this Warrant will, upon exercise, be
fully paid and nonassessable and free from all taxes, liens and charges in
respect of the issue (other than taxes in respect of any transfer occurring
contemporaneously with such issue). The Company shall pay any and all United
States federal, state and local taxes and other charges that may be payable in
connection with the preparation, issuance and delivery of the certificates
representing Securities issued hereunder.

        5. Exercise of Warrant. This Warrant may be exercised in whole or part
by the Holder, at any time after the date hereof prior to the termination of
this Warrant, by the surrender of this Warrant, together with the Notice of
Exercise and Investment Representation Statement in the forms attached hereto as
Attachments 1 and 2, respectively, duly completed and executed at the principal
office of the Company, specifying the portion of the Warrant to be exercised and
accompanied by payment in full of the Warrant Price in cash or by check with
respect to the shares of Warrant Stock being purchased. This Warrant shall be
deemed to have been exercised immediately prior to the close of business on the
date of its surrender for exercise as provided

<PAGE>   54

above, and the person entitled to receive the shares of Warrant Stock issuable
upon such exercise shall be treated for all purposes as Holder of such shares of
record as of the close of business on such date. As promptly as practicable
after such date (but no later than fifteen (15) days after such date), the
Company shall issue and deliver to the person or persons entitled to receive the
same a certificate or certificates for the number of full shares of Warrant
Stock issuable upon such exercise. If the Warrant shall be exercised for less
than the total number of shares of Warrant Stock then issuable upon exercise,
promptly after surrender of the Warrant upon such exercise (but no later than
fifteen (15) days after such surrender), the Company will execute and deliver a
new Warrant, dated the date hereof, evidencing the right of the Holder to the
balance of the Warrant Stock purchasable hereunder upon the same terms and
conditions set forth herein.

        6. Conversion.

               a. In lieu of exercising this Warrant or any portion hereof, the
Holder hereof shall have the right to convert this Warrant or any portion hereof
into Warrant Stock by executing and delivering to the Company at its principal
office the written Notice of Conversion and Investment Representation Statement
in the forms attached hereto as Attachments 2 and 3, specifying the portion of
the Warrant to be converted, and accompanied by this Warrant. The number of
shares of Warrant Stock to be issued to the Holder upon such conversion shall be
computed using the following formula:

                                X = (P)(Y)(A-B)/A

where                   X = the number of shares of Securities to be issued to
                            the Holder for the portion of the Warrant being
                            converted.

                        P = the portion of the Warrant being converted expressed
                            as a decimal fraction.

                        Y = the total number of shares of Securities issuable
                            upon exercise of the Warrant in full.

                        A = the Fair Market Value of one share of Warrant Stock.

                        B = the Warrant Price on the date of conversion.

               b. For purposes of this Section 6, "Fair Market Value" shall
mean:

                      (i) the closing price of shares of the Company's common
               stock quoted on the Nasdaq National Market or the closing price
               quoted on any exchange on which such shares are listed, whichever
               is applicable, on the trading day immediately preceding the date
               of delivery of the notices pursuant to this Section 3 (it being
               understood that the original Warrant may be surrendered on the
               subsequent day if such original Warrant is provided to an
               overnight courier service (eg, Federal Express) on the date of
               delivery of such notices), or

                      (ii) if the Company's common stock is not listed on the
               Nasdaq National Market or on an exchange, the fair market value
               of one share of common

<PAGE>   55

                stock as determined in good faith by the Company's Board of
                Directors.; provided, however, that if the Holder shall dispute
                the market price as determined by the Board, the Holder and the
                Company may retain an independent expert mutually agreed upon in
                good faith by the Holder and the Board (an "Independent
                Expert"). The determination of market price by the Independent
                Expert shall be final, binding and conclusive on the Company and
                the Holder. All costs and expenses of the Independent Expert
                shall be borne by the Holder unless the determination of fair
                market value is more favorable to such Holder by 5% or more, in
                which case, all such costs and expenses shall be borne by the
                Company.

               c. Any portion of this Warrant that is converted shall be
immediately canceled. This Warrant or any portion hereof shall be deemed to have
been converted immediately prior to the close of business on the date of its
surrender for conversion as provided above, and the person entitled to receive
the shares of Warrant Stock issuable upon such conversion shall be treated for
all purposes as the Holder of such shares of record as of the close of business
on such date. As promptly as practicable after such date (but no later than
fifteen (15) days after such date), the Company shall issue and deliver to the
person or persons entitled to receive the same a certificate or certificates for
the number of full shares of Warrant Stock issuable upon such conversion. If the
Warrant shall be converted for less than the total number of shares of Warrant
Stock then issuable upon conversion, promptly after surrender of the Warrant
upon such conversion (but no later than fifteen (15) days after such surrender),
the Company will execute and deliver a new Warrant, dated the date hereof,
evidencing the right of the Holder to the balance of the Warrant Stock
purchasable hereunder upon the same terms and conditions set forth herein.
Notwithstanding anything to the contrary contained herein, the Holder may elect
to receive a net issuance of Securities pursuant to this Section 6 when
converting this Warrant in part.

        7. Transfer of Warrant. This Warrant may be transferred or assigned by
the Holder hereof in whole or in part to an affiliate of the Holder if (i) the
transferee agrees in writing to be subject to the terms of this Warrant; and
(ii) the transferee delivers written notice of such transfer to the Company.
Upon any partial transfer, the Company will at its expense issue and deliver to
the Holder a new Warrant of like tenor, in the name of the Holder, which shall
be exercisable for such number of Securities that were not so transferred.

        8. Representations and Warranties. The Company hereby makes all the
representations and warranties set forth in Section 3 of the Series C Preferred
Stock Purchase Agreement dated as of the date hereof among the Company, the
Holder and certain other investors (the "Series C Preferred Stock Purchase
Agreement"). The Holder hereby makes all the representations and warranties set
forth in Section 4 of the Series C Preferred Stock Purchase Agreement.

        9. Loss, Theft, Destruction or Mutilation of Warrant. Upon receipt by
the Company of evidence reasonably satisfactory to it of the loss, theft,
destruction or mutilation of this Warrant, and in case of loss, theft or
destruction, of indemnity or security reasonably satisfactory to it, and upon
surrender and cancellation of this Warrant, if mutilated, the Company will make
and deliver a new Warrant of like tenor and dated as of such cancellation or
delivery, in lieu of this Warrant.

<PAGE>   56

        10. Saturdays, Sundays, Holidays, etc. If the last or appointed day for
the taking of any action or the expiration of any right required or granted
herein shall be a Saturday or a Sunday or shall be a legal holiday in San
Francisco, California, then such action may be taken or such right may be
exercised on the next succeeding day not a legal holiday in San Francisco,
California.

        11. Termination. This Warrant shall terminate on 5:00 p.m. California
time on the Termination Date.

        12. Miscellaneous. This Warrant shall be governed by the laws of the
State of California, as such laws are applied to contracts to be entered into
and performed entirely in California. The headings in this Warrant are for
purposes of convenience and reference only, and shall not be deemed to
constitute a part hereof. Neither this Warrant nor any term hereof may be
changed or waived orally, but only by an instrument in writing signed by the
Company and the Holder of this Warrant. The terms and provisions of this Warrant
shall inure to the benefit of, and be binding upon, the Company, the Holder and
their respective successors and assigns. All notices and other communications
from the Company to the Holder of this Warrant shall be delivered personally or
mailed by first class mail, postage prepaid, to the address furnished to the
Company by the Holder in the Series C Preferred Stock Purchase Agreement, or to
such other address as the Holder or any transferee or assignee thereof shall
have furnished to the Company in writing, and if mailed shall be deemed given
three days after deposit in the United States mail.

        ISSUED:December 13, 1999

                                 TELOCITY, INC.

                                 By:
                                    -------------------------------
                                     Patti Hart, President

<PAGE>   57

                                  Attachment 1

                               NOTICE OF EXERCISE

TO: TELOCITY, INC.

        1. The undersigned hereby elects to purchase _________ shares of the
Warrant Stock of Telocity, Inc. pursuant to the terms of the attached Warrant,
and tenders herewith payment of the purchase price in full.

        2. Please issue a certificate or certificates representing said shares
of Warrant Stock in the name of the undersigned or in such other name as is
specified below:

                    ----------------------------------------
                                     (Name)

                    ----------------------------------------
                                    (Address)
-------------------------------                  -------------------------------
(Date)                                           (Name of Warrant Holder)

                                                 By:
                                                    ----------------------------

                                                 Title:
                                                       -------------------------

<PAGE>   58

                                  Attachment 2

                       INVESTMENT REPRESENTATION STATEMENT

                            Shares of the Securities
                     (as defined in the attached Warrant) of
                                 TELOCITY, INC.

        In connection with the purchase of the above-listed securities, the
undersigned hereby represents to Telocity, Inc. (the "Company") as follows:

        (a) The securities to be received upon the exercise of the Warrant (the
"Securities") will be acquired for investment for its own account, not as a
nominee or agent, and not with a view to the sale or distribution of any part
thereof, and the undersigned has no present intention of selling, granting
participation in or otherwise distributing the same, but subject, nevertheless,
to any requirement of law that the disposition of its property shall at all
times be within its control. By executing this Statement, the undersigned
further represents that it does not have any contract, undertaking, agreement or
arrangement with any person to sell, transfer, or grant participations to such
person or to any third person, with respect to any Securities issuable upon
exercise of the Warrant.

        (b) The undersigned understands that the Securities issuable upon
exercise of the Warrant at the time of issuance may not be registered under the
Securities Act of 1933, as amended (the "Act"), and applicable state securities
laws, on the ground that the issuance of such securities is exempt pursuant to
Section 4(2) of the Act and state law exemptions relating to offers and sales
not by means of a public offering, and that the Company's reliance on such
exemptions is predicated on the undersigned's representations set forth herein.

        (c) Except for a transfer by the undersigned, in the event the
undersigned is a partnership, to a limited or general partner of such
partnership, the undersigned agrees that in no event will it make a disposition
of any Securities acquired upon the exercise of the Warrant unless and until (i)
it shall have notified the Company of the proposed disposition, and (ii) it
shall have furnished the Company with an opinion of counsel reasonably
satisfactory to the Company and Company's counsel to the effect that (A)
appropriate action necessary for compliance with the Act and any applicable
state securities laws has been taken or an exemption from the registration
requirements of the Act and such laws is available, and (B) the proposed
transfer will not violate any of said laws. Notwithstanding the foregoing, no
opinion of counsel shall be required for any transfer to an affiliate (as such
term is defined in Rule 405 of the Act) of the undersigned.

        (d) The undersigned acknowledges that an investment in the Company is
highly speculative and represents that it is able to fend for itself in the
transactions contemplated by this Statement, has such knowledge and experience
in financial and business matters as to be capable of evaluating the merits and
risks of its investments, and has the ability to bear the economic risks
(including the risk of a total loss) of its investment. The undersigned
represents that it has had the opportunity to ask questions of the Company
concerning the Company's business and assets and to obtain any additional
information which it considered necessary to verify the

<PAGE>   59

accuracy of or to amplify the Company's disclosures, and has had all questions
which have been asked by it satisfactorily answered by the Company.

        (e) The undersigned acknowledges that the Securities issuable upon
exercise of the Warrant must be held indefinitely unless subsequently registered
under the Act or an exemption from such registration is available. The
undersigned is aware of the provisions of Rule 144 promulgated under the Act
which permit limited resale of shares purchased in a private placement subject
to the satisfaction of certain conditions, including, among other things, the
existence of a public market for the shares, the availability of certain current
public information about the Company, the resale occurring not less than one
year after a party has purchased and paid for the security to be sold, the sale
being through a "broker's transaction" or in transactions directly with a
"market makers" (as provided by Rule 144(f)) and the number of shares being sold
during any three-month period not exceeding specified limitations.

        Dated:
              -------------------------------

                                      -------------------------------
                                      (Typed or Printed Name)

                                      By:
                                         ----------------------------
                                           (Signature)

                                      -------------------------------
                                      (Title)

<PAGE>   60

                                  Attachment 3

                              NOTICE OF CONVERSION

TO: TELOCITY, INC.

        1. The undersigned hereby elects to acquire _________ shares of the
Securities of Telocity, Inc. pursuant to the terms of the attached Warrant, by
conversion of ____ percent (__%) of the Warrant.

        2. Please issue a certificate or certificates representing said shares
of Securities in the name of the undersigned or in such other name as is
specified below:

                      ------------------------------------
                                     (Name)

                      ------------------------------------
                                    (Address)

Dated:
      -------------------------------

                                             -------------------------------
                                             (Typed or Printed Name)

                                              By:
                                                 ---------------------------
                                                   (Signature)

                                             -------------------------------
                                             (Title)

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00000-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00000-of-00352.parquet"}]]