Document:

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                                                                   EXHIBIT 10.23

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
CORPORATION RECEIVES AN OPINION OF COUNSEL FOR THE HOLDER OF SUCH SECURITIES
REASONABLY SATISFACTORY TO THE CORPORATION STATING THAT SUCH SALE, TRANSFER,
ASSIGNMENT OR HYPOTHECATION IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS
DELIVERY REQUIREMENTS OF SUCH ACT.

                                                               September 5, 2000

                       WARRANT TO PURCHASE COMMON STOCK
                                      OF
                           ZHONE TECHNOLOGIES, INC.

                        (void after September 5, 2005)

     1.   Number of Shares Subject to Warrant.  For value received and in
          -----------------------------------
consideration of the Holder (as defined below) entering into a co-marketing
agreement between the Holder and Zhone Technologies, Inc., a Delaware
corporation (the "Corporation"), subject to the terms and conditions herein set
forth, Holder (as defined below) is entitled to purchase from the Corporation,
during the times specified herein, at a price per share equal to the Warrant
Price (as defined below), the Warrant Stock (as defined 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.   "Holder" shall mean the Broadband Infrastructure Group
Corporation or its assigns.

          b.   "Securities" shall mean Thirty Thousand (30,000) shares of common
stock of the Corporation subject to adjustment pursuant to Section 8 hereof.

          c.   "Warrant Price" shall be $9.50 per share subject to adjustment
pursuant to Section 8 hereof.

          d.   "Warrant Stock" shall mean the Securities purchasable upon
exercise of this Warrant or issuable upon conversion of this Warrant.

     3.   Fractional Shares.  No fractional shares shall be issuable upon
          -----------------
exercise or conversion of this Warrant and the number of shares to be issued
shall be rounded down to the nearest whole share. If a fractional share interest
arises upon any exercise or conversion of the
<PAGE>

Warrant, the Corporation shall eliminate such fractional share interest by
paying the Holder an amount computed by multiplying the fractional interest by
the fair market value of a full share.

     4.   No Stockholder Rights.  This Warrant, by itself, as distinguished
          ---------------------
from any shares purchased hereunder, shall not entitle the Holder to any of the
rights of a stockholder of the Corporation.

     5.   Reservation of Stock.  The Corporation will reserve from its
          --------------------
authorized and unissued Common Stock a sufficient number of shares to provide
for the issuance of the Warrant Stock upon the exercise or conversion of this
Warrant. Issuance of this Warrant shall constitute full authority to the
Corporation'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.

     6.   Exercise of Warrant.  This Warrant may be exercised 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
Corporation, specifying the portion of the Warrant to be exercised and subject
to paragraph 7 below 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 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, the Corporation 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 and pay for any fractional share
pursuant to Section 3 hereof. 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, the Corporation 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.

     7.   Conversion.  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 Corporation
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 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.
<PAGE>

               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.

     For purposes of this Section 7, the fair market value of one share of the
Corporation's Common Stock shall mean:

               (i)      the closing price per share of the Corporation's Common
     Stock on the principal national securities exchange on which the Common
     Stock is listed or admitted to trading or,

               (ii)     if not listed or traded on any such exchange, the last
     reported sales price per share on the Nasdaq National Market or the Nasdaq
     Small-Cap Market (collectively, "Nasdaq") or,

               (iii)    if not listed or traded on any such exchange or Nasdaq,
     the average of the bid and asked price per share as reported in the "pink
     sheets" published by the National Quotation Bureau, Inc. (the "pink
     sheets") or,

               (iv)     if such quotations are not available, the fair market
     value per share of the Corporation's Common Stock on the date such notice
     was received by the Corporation as reasonably determined by the Board of
     Directors of the Corporation.

     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 holder of such shares of record as of the close of business on
such date.  As promptly as practicable after such date, the Corporation 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 and pay for any fractional share pursuant to
Section 3 hereof.  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, the Corporation 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.
<PAGE>

     8.   Adjustment of Exercise Price and Number of Shares.  The number of
          -------------------------------------------------
shares issuable upon exercise of this Warrant (or any shares of stock or other
securities or property at the time receivable or issuable upon exercise of this
Warrant) and the Warrant Price therefor are subject to adjustment upon the
occurrence of the following events:

          a.   Adjustment for Stock Splits, Stock Dividends, etc.  The Warrant
               -------------------------------------------------
Price and the number of shares issuable upon exercise of this Warrant shall each
be proportionally adjusted to reflect any stock dividend, stock split, reverse
stock split, combination of shares, or other similar event altering the number
of outstanding shares of the Corporation's capital stock.

          b.   Adjustment for Other Dividends and Distributions.  In case the
               ------------------------------------------------
Corporation shall make or issue, or shall fix a record date for the
determination of eligible holders entitled to receive, a dividend or other
distribution with respect to the shares payable in securities of the Corporation
then, and in each such case, the Holder, on exercise of this Warrant at any time
after the consummation, effective date or record date of such event, shall
receive, in addition to the Warrant Stock (or such other stock or securities)
issuable on such exercise prior to such date, the securities of the Corporation
to which such Holder would have been entitled upon such date if such Holder had
exercised this Warrant immediately prior thereto (all subject to further
adjustment as provided in this Warrant).

     9.   Adjustment for Capital Reorganization, Consolidation, Merger, etc.
          -----------------------------------------------------------------
If any capital reorganization, reclassification, recapitalization of the capital
stock of the Corporation, or any consolidation or merger of the Corporation with
or into another corporation, or the sale of all or substantially all of the
Corporation's assets to another corporation shall be effected in such a way that
holders of the Corporation's capital stock will be entitled to receive stock,
securities or assets with respect to or in exchange for the Corporation's
capital stock, in each such case the Holder, upon the exercise of this Warrant,
at any time after the consummation of such capital reorganization,
reclassification, recapitalization, consolidation, merger, or sale, shall be
entitled to receive, in lieu of the stock or other securities and property
receivable upon the exercise of this Warrant prior to such consummation, the
stock or other securities or property to which such Holder would have been
entitled upon such consummation if such Holder had exercised this Warrant
immediately prior to the consummation of such capital reorganization,
reclassification, recapitalization, consolidation, merger, or sale, all subject
to further adjustment as provided in this Section 9; and in each such case, the
terms of this Warrant shall be applicable to the shares of stock or other
securities or property receivable upon the exercise of this Warrant after such
consummation.

     10.  Transfer of Warrant.  This Warrant may be transferred or assigned by
          -------------------
the Holder hereof in whole or in part, subject to the reasonable approval of the
Corporation (which such approval shall not be unreasonably withheld), provided
that the transferor provides, at the Corporation's request, an opinion of
counsel satisfactory to the Corporation that such transfer does not require
registration under the Act and the securities law applicable with respect to any
other applicable jurisdiction.

     11.  "Market Stand-Off" Agreement.  Holder hereby agrees that, during the
          ----------------------------
period of duration (not to exceed one hundred eighty (180) days) specified by
the Corporation and an
<PAGE>

underwriter of Common Stock or other securities of the Company following the
effective date of a registration statement of the Corporation filed under the
Securities Act, it shall not, to the extent requested by the Corporation and
such underwriter, directly or indirectly sell, offer to sell, contract to sell
(including, without limitation, any short sale), grant any option to purchase,
pledge or otherwise transfer or dispose of (other than to donees who agree to be
similarly bound) any securities of the Corporation held by it at any time during
such period except Common Stock included in such registration; provided,
however, that:

               i.     such agreement shall be applicable only to the first such
registration statement of the Company which covers Common Stock (or other
securities) to be sold on its behalf to the public in an underwritten offering;
and

               ii.    such agreement shall not be required unless all executive
officers, directors and holders of 1% or more of the outstanding capital stock
of the Corporation enter into similar agreements.

     In order to enforce the foregoing covenant, the Company may impose stop-
transfer instructions with respect to the Securities of Holder (and the shares
of securities of every other person subject to the foregoing restriction) until
the end of such period.

     12.  Termination.  This Warrant shall terminate and no longer by
          -----------
exercisable at 5:00 p.m. California time, on September 5, 2005.

     13.  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 by California residents.  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 Corporation and the Holder of this Warrant.  All notices and other
communications from the Corporation to the Holder of this Warrant shall be
delivered personally or mailed by first class mail, postage prepaid, to the
address furnished to the Corporation in writing by the last Holder of this
Warrant who shall have furnished an address to the Corporation in writing, and
if mailed shall be deemed given three days after deposit in the United States
mail.

                                Zhone Technologies, Inc.

                                By: /s/  Bruce Ruberg
                                    --------------------------------------------

                                Name:    Bruce Ruberg
                                      ------------------------------------------

                                Title:   Corporate Controller
                                       -----------------------------------------
<PAGE>

                                 Attachment 1

NOTICE OF EXERCISE

TO:  Zhone Technologies, Inc.

1.  The undersigned hereby elects to purchase ________________ shares of the
    Warrant Stock of Zhone Technologies, Inc. pursuant to the terms of the
    attached Warrant, and tenders herewith payment of the purchase price in
    full, together with all applicable transfer taxes, if any.

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>

                                 Attachment 2

                      INVESTMENT REPRESENTATION STATEMENT

                           Shares of the Securities
                    (as defined in the attached Warrant) of
                           Zhone Technologies, Inc.

In connection with the purchase of the above-listed securities, the undersigned
hereby represents to Zhone Technologies, Inc. (the "Corporation") 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 in violation
     of the Securities Act, 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 participation to such person or
     to any third person, with respect to any Securities issuable upon exercise
     of the Warrant in violation of the Securities Act.

(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 Corporation's reliance on such exemptions is predicated on the
     undersigned's representations set forth herein.

(c)  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 Corporation of the proposed disposition and
     shall have furnished the Corporation with a statement of the circumstances
     surrounding the proposed disposition, and (ii) it shall have furnished the
     Corporation with an opinion of counsel satisfactory to the Corporation and
     Corporation'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.

(d)  The undersigned acknowledges that an investment in the Corporation 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 Corporation
<PAGE>

     concerning the Corporation's business and assets and to obtain any
     additional information which it considered necessary to verify the accuracy
     of or to amplify the Corporation's disclosures, and has had all questions
     which have been asked by it satisfactorily answered by the Corporation.

(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 Corporation, 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>

                                 Attachment 3

NOTICE OF CONVERSION

TO:  Zhone Technologies, Inc.

1.  The undersigned hereby elects to acquire ________________ shares of the
    Securities of Zhone Technologies, 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>
<TABLE>
<S>                                                 <C>                                          <C>
                                                                                                                         EXHIBIT 4.3
                                                           Common Stock
                                                          $0.001 Par Value
------------                                                                                                             -----------
   Number                                                                                                                   Shares

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

                                                    [MOTIVE LOGO APPEARS HERE]

                                                    Motive Communications, Inc.

INCORPORATED UNDER THE LAWS                                THIS CERTIFICATE IS TRANSFERABLE IN
OF THE STATE OF DELAWARE                                  NEW YORK, NY AND RIDGEFIELD PARK, NJ            CUSIP 6198OJ 10 4
                                                                                                 SEE REVERSE FOR CERTAIN DEFINITIONS
------------------------------------------------------------------------------------------------------------------------------------
THIS CERTIFIES THAT

IS THE RECORD HOLDER OF
------------------------------------------------------------------------------------------------------------------------------------
                                      FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK OF

Motive Communications, Inc., a Delaware corporation (hereinafter referred to as the "Corporation"), transferable on the books of the
Corporation in person or by duly authorized attorney upon surrender of this certificate properly endorsed. This certificate is not
valid unless countersigned by the transfer agent and registered by the registrar.

     Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

Dated:

                                                [MOTIVE COMMUNICATIONS, INC.                COUNTERSIGNED AND REGISTERED:
                                                CORPORATE SEAL APPEARS HERE]                CHASEMELLON SHAREHOLDER SERVICES, L.L.C.
                                                                                                        TRANSFER AGENT AND REGISTRAR

                                                                                            BY
/s/ LINDA G. HAMANN                     /s/ SCOTT HARMON
      SECRETARY              PRESIDENT AND CHIEF EXECUTIVE OFFICER                                              AUTHORIZED SIGNATURE

</TABLE>
<PAGE>

                          MOTIVE COMMUNICATIONS, INC.

   The Corporation will furnish without charge to each stockholder who so
requests, a copy of the designations, powers, preferences and relative,
participating, optional or other special rights of each class of stock or series
thereof of the Corporation and the qualifications, limitations or restrictions
of such preferences and/or rights.  Such requests may be made to the Secretary
of the Corporation.

   The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

   TEN COM -- as tenants in common      UNIF GIFT MIN ACT -- .....Custodian.....
   TEN ENT -- as tenants by the                              (Cust)      (Minor)
              entireties                                     under Uniform
   JT TEN  -- as joint tenants with                          Gifts to Minors
              right of survivorship                          Act................
              and not as tenants in                                 (State)
              common

    Additional abbreviations may also be used though not in the above list.

        For value received, _________________________ hereby sell, assign
        and transfer unto

           PLEASE INSERT SOCIAL SECURITY OR OTHER
               IDENTIFYING NUMBER OF ASSIGNEE
        --------------------------------------------
        |                                          |
        |                                          |
        --------------------------------------------

        _________________________________________________________________
                 (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
                        INCLUDING ZIP CODE OF ASSIGNEE)

        _________________________________________________________________

        _________________________________________________________________

        __________________________________________________________ shares
        of the stock represented by the within Certificate, and do hereby
        irrevocably constitute and appoint
        ________________________________________________________ Attorney
        to transfer the said stock on the books of the within named
        Corporation with full power of substitution in the premises.

        Dated _______________________________

                        ________________________________________________________
                NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH
                        THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN
                        EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR
                        ANY CHANGE WHATEVER.

           SIGNATURE GUARANTEED:

        BY ____________________________________________________
           THE SIGNATURE(S) MUST BE GUARANTEED BY AN ELIGIBLE
           GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS
           AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH
           MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE
           MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.

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