Document:

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                                                                   Exhibit 10.20

                      PREFERRED STOCK OR COMMON STOCK, AS
                  APPLICABLE, PURCHASE WARRANT ISSUED IN FAVOR
                            OF NORTEL NETWORKS INC.

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                       PREFERRED STOCK OR COMMON STOCK, AS
                          APPLICABLE, PURCHASE WARRANT

     THIS WARRANT AND THE SHARES OF PREFERRED STOCK OR COMMON STOCK, AS
     APPLICABLE, WHICH MAY BE PURCHASED PURSUANT TO THE EXERCISE OF THIS WARRANT
     HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE
     "ACT"), AND SUCH SECURITIES MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED
     OR DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION UNDER
     THE ACT AND THE RULES AND REGULATIONS THEREUNDER. THE SALE OR OTHER
     DISPOSITION OF THIS WARRANT AND THE SHARES OF PREFERRED STOCK OR COMMON
     STOCK, AS APPLICABLE, WHICH MAY BE PURCHASED PURSUANT TO THE EXERCISE OF
     THIS WARRANT IS RESTRICTED BY A RIGHT OF FIRST OFFER AND CO-SALE AGREEMENT,
     AS AMENDED, FROM TIME TO TIME, AMONG CERTAIN STOCKHOLDERS OF THE ISSUER AND
     THE ISSUER (THE "AGREEMENT"). A COPY OF THE AGREEMENT IS AVAILABLE FOR
     INSPECTION DURING NORMAL BUSINESS HOURS AT THE PRINCIPAL EXECUTIVE OFFICE
     OF THE ISSUER.

NO. W-3                                              VOID AFTER EXPIRATION DATE
                                                             (AS DEFINED BELOW)

                                     WARRANT

                  TO PURCHASE 51,230 SHARES OF PREFERRED STOCK
                       OR COMMON STOCK, AS APPLICABLE, OF

                              ELASTIC NETWORKS INC.

                              Dated August __, 2000

     THIS WARRANT CERTIFIES THAT, for value received, NORTEL NETWORKS INC. or
its permitted transferees or assigns (the "Holder") is entitled to

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purchase from Elastic Networks Inc., a Delaware corporation (the "Company"), up
to 51,230 fully paid and nonassessable shares (the "Shares") (as adjusted
pursuant to SECTION 3 below) of (i) prior to the date of completion of an
initial firm commitment underwritten public offering of common stock of the
Company which results in net proceeds to the Company of at least $35,000,000 (a
"QIPO"), Series B Redeemable Convertible Participating Preferred Stock, $.01 par
value ("Preferred Stock"), of the Company and (ii) at or following the
completion of a QIPO, common stock, $.01 par value ("Common Stock"), of the
Company, at an exercise price equal to $7.32 per share (the "Exercise Price"),
or, in case an adjustment of the Exercise Price has taken place pursuant to the
provisions of SECTION 3 below, in each case at the Exercise Price as last
adjusted and in effect on the date this Warrant is exercised.

     This Warrant shall expire at 5:00 p.m., Atlanta, Georgia time, on the third
anniversary of the date of this Warrant (the "Expiration Date").

     SECTION 1. EXERCISE AND PAYMENT.

         SECTION 1.1 EXERCISE. On or after the date hereof, the purchase rights
represented by this Warrant may be exercised by the Holder, in whole or in part,
by the surrender of this Warrant (together with a duly executed exercise notice
(the "Notice of Exercise") in the form attached hereto as EXHIBIT A-1) at the
principal office of the Company, and by the payment to the Company, by wire
transfer, of an amount equal to the aggregate Exercise Price of the Shares being
purchased.

         SECTION 1.2 NET ISSUE ELECTION. The Holder may elect to receive,
without the payment by the Holder of any additional consideration, shares equal
to the value of this Warrant or any portion hereof by the surrender of this
Warrant or such portion (together with a duly executed exercise notice (the "Net
Issue Notice of Exercise") in the form attached hereto as EXHIBIT A-2) at the
principal office of the Company. Thereupon, the Company shall issue to the
Holder such number of shares of Preferred Stock or Common Stock, as applicable,
as is computed using the following formula:

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

where

          X  = the number of shares to be issued to the Holder pursuant to
               this SECTION 1.2.

          Y  = the number of shares covered by this Warrant in respect of
               which the net issue election is made pursuant to this SECTION
               1.2.

          A  = the Fair Market Value of one share of Preferred Stock or Common
               Stock, as applicable, as determined in accordance with SECTION 6

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               hereof, as at the time the net issue election is made pursuant to
               this SECTION 1.2.

          B  = the Exercise Price in effect under this Warrant at the time the
               net issue election is made pursuant to this SECTION 1.2.

         SECTION 1.3 STOCK CERTIFICATES. In the event of the exercise of all or
any portion of this Warrant, certificates for the shares of Preferred Stock or
Common Stock, as applicable, so purchased shall be delivered to the Holder by
the Company at its own expense (including the payment by the Company of any
applicable issue taxes or governmental charges imposed in connection with the
issuance or delivery of the Preferred Stock or Common Stock, as applicable, but
excluding applicable transfer taxes if the shares of Preferred Stock or Common
Stock, as applicable, are to be issued to anyone other than the registered
holder of this Warrant) within a reasonable time, which shall in no event be
later than fifteen (15) days thereafter and, unless this Warrant has been fully
exercised or has expired, a new Warrant representing the Shares with respect to
which this Warrant shall not have been exercised shall also be issued to the
Holder within such time.

               If this Warrant shall be surrendered for exercise within any
period during which the transfer books for shares of the Preferred Stock or
Common Stock, as applicable, or other securities purchasable upon the exercise
of this Warrant are closed for any purpose, the Company shall not be required to
make delivery of certificates for the securities purchasable upon such exercise
until the date of the reopening of said transfer books.

     SECTION 2. STOCK FULLY PAID; RESERVATION OF SHARES. All of the Shares
issuable upon the exercise of this Warrant will, upon issuance and receipt of
the Exercise Price therefor, be fully paid and nonassessable with no personal
liability attaching to the ownership thereof, and free and clear of all taxes,
liens, encumbrances and charges with respect to the issue thereof. During the
period within which this Warrant may be exercised, the Company shall at all
times have authorized and reserved for issuance sufficient shares of its
Preferred Stock or Common Stock, as applicable, to provide for the exercise of
this Warrant.

     SECTION 3. ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF SHARES. The number
and kind of securities purchasable upon the exercise of this Warrant and the
Exercise Price therefor shall be subject to adjustment from time to time upon
the occurrence of certain events, as follows:

         SECTION 3.1 ADJUSTMENTS FOR SUBDIVISIONS OF PREFERRED STOCK OR COMMON
STOCK, AS APPLICABLE. If the number of shares of Preferred Stock or Common
Stock, as applicable, outstanding at any time is increased by a stock dividend
payable in shares of Preferred Stock or Common Stock, as applicable, or by a
subdivision or split up of stock, then the Exercise Price then in effect shall,
concurrently with the effectiveness of such dividend, subdivision or split up,
be proportionately decreased so that the number of shares of Preferred Stock or
Common Stock, as applicable, issuable upon exercise of

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this Warrant shall be increased in proportion to such increase of outstanding
shares of Preferred Stock or Common Stock, as applicable.

         SECTION 3.2 ADJUSTMENTS FOR COMBINATIONS OF PREFERRED STOCK OR COMMON
STOCK, AS APPLICABLE. If the number of shares of Preferred Stock or Common
Stock, as applicable, outstanding at any time is decreased by a combination of
the outstanding shares of Preferred Stock or Common Stock, as applicable, then
the Exercise Price then in effect shall, concurrently with the effectiveness of
such combination, be proportionately increased so that the number of shares of
Preferred Stock or Common Stock, as applicable, issuable upon exercise of this
Warrant shall be decreased in proportion to such decrease in outstanding shares
of Preferred Stock or Common Stock, as applicable.

         SECTION 3.3 ADJUSTMENTS FOR STOCK DIVIDENDS AND OTHER DISTRIBUTIONS. In
the event the Company at any time or from time to time makes or fixes a record
date for the determination of holders of Preferred Stock or Common Stock, as
applicable, entitled to receive any distribution (excluding any repurchases of
securities by the Company not made on a pro rata basis from all holders of any
class of the Company securities) payable in property (other than cash) or in
securities of the Company (other than shares of Preferred Stock or Common Stock,
as applicable), then and in each such event this Warrant shall represent the
right to acquire, in addition to the number of shares of the security receivable
upon the exercise of this Warrant, and without payment of any additional
consideration therefor, the amount of such property (other than cash) or
securities of the Company (other than shares of Preferred Stock or Common Stock,
as applicable) that the Holder would hold on the date of such exercise had it
been the holder of record of the security receivable upon the exercise of this
Warrant on the date hereof and had thereafter, during the period from the date
hereof to and including the date of such exercise, retained such property (other
than cash) or securities of the Company (other than shares of Preferred Stock or
Common Stock, as applicable) during such period.

         SECTION 3.4 ADJUSTMENTS FOR RECLASSIFICATION, EXCHANGE AND
SUBSTITUTION. Except as provided in SECTION 5 upon a Notice Event, if the entire
class or series of Preferred Stock or Common Stock, as applicable, issuable upon
exercise of this Warrant shall be changed into the same or a different number of
shares of any other class or classes of stock, whether by capital
reorganization, reclassification or otherwise (other than a subdivision or
combination of shares provided for above) this Warrant shall thereafter be
exercisable into, in lieu of the number of shares of Preferred Stock or Common
Stock, as applicable, which the Holder would otherwise have been entitled to
receive, a number of shares of such other class or classes of stock equivalent
to the number of shares of Preferred Stock or Common Stock, as applicable, that
would have been subject to receipt by the Holder upon exercise of this Warrant
immediately before that change. In addition, to the extent applicable in any
reorganization or recapitalization, provision shall be made so that the Holder
of this Warrant shall thereafter be entitled to receive upon exercise of this
Warrant the number of shares of stock or other securities or property of the
Company or otherwise, to which a holder of Preferred Stock or Common

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Stock, as applicable, deliverable upon exercise would have been entitled on such
reorganization or recapitalization

         SECTION 3.5 CERTIFICATE AS TO ADJUSTMENTS. In the case of any
adjustment in the Exercise Price or number and type of securities issuable upon
exercise of this Warrant, the Company will promptly give written notice to the
Holder in the form of a certificate, certified and confirmed by an officer of
the Company, setting forth the adjustment in reasonable detail.

     SECTION 4. MERGER, CONSOLIDATION, OR LIQUIDATION; QIPO.

                    (i) If (A) the Company consolidates with or merges into
another entity and is not the survivor, or sells or conveys substantially all of
its property, and (B) in connection therewith, shares of stock, other
securities, property, or cash (collectively, "Merger Consideration") are
issuable or deliverable in exchange for the Company's capital stock, then (C)
the Company shall give the Holder at least 10 days prior written notice of the
consummation of such transaction and (D) the Holder may thereafter acquire in
lieu of the shares of Preferred Stock or Common Stock, as applicable, issuable
upon exercise of this Warrant the Merger Consideration which the Holder could
have received had the Holder then exercised this Warrant in its entirety.

                    (ii) If the Company receives notice that a purchase, tender
or exchange offer has been made to the holders of more than 50% of the
outstanding Preferred Stock or Common Stock, as applicable, (on an as converted
basis), the Company shall give the Holder reasonable notice thereof.

                    (iii) The Company shall give the Holder reasonable prior
written notice of the completion of a QIPO.

         SECTION 5. NOTICE OF CERTAIN EVENTS. In the event (a "Notice Event"):
(a) the Company authorizes the issuance to all holders of any class of its
capital stock rights or warrants to subscribe for or purchase shares of its
capital stock, or any other subscription rights or warrants; (b) the Company
authorizes the distribution to all holders of any class of its capital stock
evidences of indebtedness or assets; (c) of any capital reorganization or
reclassification of the Shares or the Company's Preferred Stock or Common Stock,
as applicable; other than a subdivision or combination of the outstanding
Preferred Stock or Common Stock, as applicable, and other than a change in par
value of the Preferred Stock or Common Stock, as applicable; (d) of any
liquidation or merger to which the Company is a party and for which approval of
any of the Company's stockholders is required, other than a consolidation or
merger in which the Company is a continuing corporation and that does not result
in any reclassification or change of the shares of Preferred Stock or Common
Stock, as applicable, issuable upon the exercise of this Warrant; (e) of the
conveyance or transfer of the Company's properties and assets, substantially as
an entirety; or (f) of the Company's voluntary or involuntary dissolution,
liquidation or winding-up; then the Company shall cause to be mailed by
certified mail to the Holder, at least 10 days prior to the applicable record or
effective date hereinafter specified, a notice stating the dates as of which (x)
the holders of capital stock of record to be entitled to

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receive any such rights, warrants or distributions are to be determined, (y)
such Notice Event is expected to become effective, and (z) it is expected that
Holders of record of Warrants shall be entitled to exchange or sell their shares
of Preferred Stock or Common Stock, as applicable, issuable upon the exercise of
this Warrant for securities or other property, if any, deliverable upon such
Notice Event.

     SECTION 6. FRACTIONAL SHARES. No fractional shares of Preferred Stock or
Common Stock, as applicable, will be issued in connection with any exercise
hereunder. In lieu of such fractional shares the Company shall make a cash
payment therefor based upon the Fair Market Value (as defined below) of the
Preferred Stock or Common Stock, as applicable, on such date. For the purposes
hereof "Fair Market Value" of a share of Preferred Stock or Common Stock, as
applicable, as of a particular date means: (a) if traded on an exchange or the
over-the-counter market, quoted on the Nasdaq National Market or reported by the
National Quotation Bureau, then the most recently reported closing or bid price,
(b) if conversion or exercise is simultaneous with an underwritten public
offering registered under the Act, the initial public offering price (before
deducting commissions, discounts or expenses) per share sold in such offer, and
(c) otherwise, the price, not less than book value, determined in good faith and
in such reasonable manner as prescribed by a majority of Company's Directors,
including at least one director who is not a Company officer or employee (the
"Outside Director").

     SECTION 7. RESTRICTIONS ON TRANSFER.

         SECTION 7.1 RESTRICTIVE LEGEND. Each certificate representing (i) the
Shares and (ii) any other securities issued in respect of the Shares upon any
stock split, stock dividend or recapitalization (collectively, the "Restricted
Securities"), shall be endorsed as follows:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
          AND SUCH SECURITIES MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR
          DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION UNDER
          THE ACT AND THE RULES AND REGULATIONS THEREUNDER. THE SALE OR OTHER
          DISPOSITION OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE IS
          RESTRICTED BY A RIGHT OF FIRST OFFER AND CO-SALE AGREEMENT, AS
          AMENDED, FROM TIME TO TIME, AMONG CERTAIN STOCKHOLDERS OF THE ISSUER
          AND THE ISSUER (THE "AGREEMENT"). A COPY OF THE AGREEMENT IS AVAILABLE
          FOR INSPECTION DURING NORMAL BUSINESS HOURS AT THE PRINCIPAL EXECUTIVE
          OFFICE OF THE ISSUER.

         SECTION 7.2 OWNERSHIP OF WARRANT. The Company may deem and treat the
person in whose name this Warrant is registered as the holder and owner hereof

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(notwithstanding any notations of ownership or writing hereon made by any person
other than the Company) for all purposes and shall not be affected by any notice
to the contrary, until presentation of this Warrant for registration of transfer
as provided in this SECTION 7.

         SECTION 7.3 TRANSFERS. As a condition to the transfer of this Warrant,
each transferee shall execute an assignment substantially in the form attached
hereto as Exhibit B. The Holder may transfer this Warrant subject to compliance
with the terms of the Right of First Offer and Co-Sale Agreement dated as of May
12, 1999 among the Company, Nortel Networks Inc. ("Nortel") and the purchasers
name therein, as amended. The Company may not assign its obligations under this
Warrant without the prior written consent of the Holder.

     SECTION 8. NO RIGHTS OF STOCKHOLDERS. This Warrant does not entitle the
Holder to any voting rights as a stockholder of the Company prior to the
exercise of the Warrant; further, the Holder has no liability as to the Exercise
Price.

     SECTION 9. NO IMPAIRMENT. The Company will not, by amendment of its
Certificate of Incorporation, as amended, or through any 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 hereunder by the
Company, but it will at all times in good faith assist in the carrying out of
all of the provisions of this Warrant and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.

     SECTION 10. 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, in
lieu of this Warrant.

     SECTION 11. 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, then such
action may be taken or such right may be exercised on the next succeeding day
not a Saturday or a Sunday or a legal holiday.

     SECTION 12. MISCELLANEOUS.

         SECTION 12.1 GOVERNING LAW. This Warrant shall be governed by and
construed in all respects in accordance with the laws of the State of Georgia
without giving effect to the conflicts of laws provisions thereof.

         SECTION 12.2 ENTIRE AGREEMENT; AMENDMENT. This Warrant constitutes the
full and entire understanding and agreement between the parties with regard to
the

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subject hereof. Neither this Warrant nor any term hereof may be amended,
waived, discharged, or terminated other than by a written instrument signed by
the party against whom enforcement of any such amendment, waiver, discharge or
termination is sought.

         SECTION 12.3 SUCCESSORS AND ASSIGNS. Except as otherwise provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the permitted successors and assigns, heirs, executors, and administrators
of the Company and the Holder.

         SECTION 12.4 NOTICES, ETC. All notices and other communications
required or permitted hereunder shall be in writing and shall be mailed by
registered or certified mail, postage prepaid, by overnight courier, or
otherwise delivered by hand or by messenger or sent by facsimile and confirmed
by mail, addressed:

                    (i)  if to the Company, at the address of the Company set
forth on the signature page of this Warrant, Attention: Chief Executive Officer
with a copy to W. Tinley Anderson, III, Esq., Hunton & Williams, Bank of America
Plaza, Suite 4100, 600 Peachtree Street, N.E., Atlanta, Georgia 30308; and

                    (ii) if to the Holder, at the address of such Holder set
forth on the signature page of this Warrant.

Each of such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when delivered if
delivered personally, or, if sent by mail or by Federal Express or other
reputable overnight carrier, upon receipt.

         SECTION 12.5 REGISTRATION RIGHTS. With respect to the Shares received
upon any exercise of this Warrant, Nortel and its successors and assigns
pursuant to Section 4 of the Investor Rights Agreement dated as of May 12, 1999
by and among the Company, Nortel and the other parties thereto, as amended (the
"Investor Rights Agreement") shall have the registration rights set forth in
Section 2 of the Investor Rights Agreement.

         SECTION 12.6 HSR ACT. The issuance of the Shares pursuant to the
exercise of this Warrant is subject to the expiration or termination of any
applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended, and the Company shall use its reasonable commercial efforts
to obtain such expiration or termination.

         [THE REMAINDER OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

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Issued this 4th day of August, 2000.

                               ELASTIC NETWORKS INC.

                               By:  /s/ Kevin D. Elop
                                    --------------------------------------
                                    Kevin D. Elop, Chief Financial Officer

                                        Address:  6120 Windward Parkway
                                                  Suite 100
                                                  Alpharetta, Georgia 30005

WARRANT HOLDER:

NORTEL NETWORKS INC.

By: /s/ Mary M. Cross
   ---------------------------
   Name: Mary M. Cross
   Title: President

Address: 200 Athens Way
         Nashville, Tennessee 37228
         Attention:  President

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            THE EXERCISE OF THIS WARRANT IS SUBJECT TO THE APPLICABLE
                 REQUIREMENTS OF THE HART-SCOTT-RODINO ANTITRUST
                      IMPROVEMENTS ACT OF 1976, AS AMENDED.

                                   EXHIBIT A-1

                               NOTICE OF EXERCISE

TO:  ELASTIC NETWORKS INC.

     Attention: Chief Financial Officer

     1.   The undersigned hereby elects to purchase _________ shares of
[Preferred Stock or Common Stock, as applicable] of ELASTIC NETWORKS INC.
pursuant to the terms of this Warrant, and tenders herewith payment of the
purchase price of such shares in full.

     2.   Please issue a certificate or certificates representing said shares of
[Preferred Stock or Common Stock, as applicable] in the name of the undersigned
or in such other name as is specified below:

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

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

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

                                            ------------------------------------
                                                       (Signature)
                                            Title:______________________________

------------------------
         (Date)

                                       10
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            THE EXERCISE OF THIS WARRANT IS SUBJECT TO THE APPLICABLE
                 REQUIREMENTS OF THE HART-SCOTT-RODINO ANTITRUST
                      IMPROVEMENTS ACT OF 1976, AS AMENDED.

                                   EXHIBIT A-2

                          NET ISSUE NOTICE OF EXERCISE

TO:  ELASTIC NETWORKS INC.

     Attention: Chief Financial Officer

     1.   The undersigned hereby elects to purchase _________ shares of
[Preferred Stock or Common Stock, as applicable] of ELASTIC NETWORKS INC.
pursuant to the terms of this Warrant, and hereby elects under SECTION 1.2 to
surrender the right to purchase _______ shares of [Preferred Stock or Common
Stock, as applicable] pursuant to this Warrant for a net issue exercise with
respect to ________ shares of [Preferred Stock or Common Stock, as applicable].

     2.   Please issue a certificate or certificates representing said shares of
[Preferred Stock or Common Stock, as applicable] in the name of the undersigned
or in such other name as is specified below:

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

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

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

                                            ------------------------------------
                                                        (Signature)

                                           Title:_______________________________

-----------------------
        (Date)

                                       11
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                                    EXHIBIT B

                                 ASSIGNMENT FORM
                  (To be signed only upon transfer of Warrant)

     FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ______________________________ (the "Transferee") whose address is
_____________________, the right represented by the attached Warrant to purchase
_________ shares of [Preferred Stock or Common Stock, as applicable] of ELASTIC
NETWORKS INC., to which the attached Warrant relates.

     Dated:____________________

                                    ------------------------------------
                                    (Signature must conform in all respects to
                                    name of Holder as specified on the face of
                                    the Warrant)

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

Signed in the presence of:

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

                                       12<PAGE>

                                                                  Exhibit 10.21

                       PREFERRED STOCK OR COMMON STOCK, AS
                  APPLICABLE, PURCHASE WARRANT ISSUED IN FAVOR
                     OF PEQUOT PRIVATE EQUITY FUND II, L.P.

<PAGE>

                        PREFERRED STOCK OR COMMON STOCK,
                        AS APPLICABLE, PURCHASE WARRANT

          THIS WARRANT AND THE SHARES OF PREFERRED STOCK OR COMMON STOCK, AS
          APPLICABLE, WHICH MAY BE PURCHASED PURSUANT TO THE EXERCISE OF THIS
          WARRANT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
          AMENDED (THE "ACT"), AND SUCH SECURITIES MAY NOT BE OFFERED, SOLD,
          TRANSFERRED, PLEDGED OR DIS-POSED OF IN THE ABSENCE OF SUCH
          REGISTRATION OR AN EXEMPTION UNDER THE ACT AND THE RULES AND
          REGULATIONS THEREUNDER. THE SALE OR OTHER DISPOSITION OF THIS WARRANT
          AND THE SHARES OF PREFERRED STOCK OR COMMON STOCK, AS APPLICABLE,
          WHICH MAY BE PURCHASED PURSUANT TO THE EXERCISE OF THIS WARRANT IS
          RESTRICTED BY A RIGHT OF FIRST OFFER AND CO-SALE AGREEMENT, AS
          AMENDED, FROM TIME TO TIME, AMONG CERTAIN STOCKHOLDERS OF THE ISSUER
          AND THE ISSUER (THE "AGREEMENT"). A COPY OF THE AGREEMENT IS AVAILABLE
          FOR INSPECTION DURING NORMAL BUSINESS HOURS AT THE PRINCIPAL EXECUTIVE
          OFFICE OF THE ISSUER.

NO. W-1                                               VOID AFTER EXPIRATION DATE
                                                              (AS DEFINED BELOW)

                                     WARRANT

                  TO PURCHASE 51,230 SHARES OF PREFERRED STOCK
                       OR COMMON STOCK, AS APPLICABLE, OF

                              ELASTIC NETWORKS INC.

                              Dated August 4, 2000

     THIS WARRANT CERTIFIES THAT, for value received, PEQUOT PRIVATE EQUITY FUND
II, L.P. or its permitted transferees or assigns (the "Holder") is entitled

<PAGE>

to purchase from Elastic Networks Inc., a Delaware corporation (the "Company"),
up to 51,230 fully paid and nonassessable shares (the "Shares") (as adjusted
pursuant to SECTION 3 below) of (i) prior to the date of completion of an
initial firm commitment underwritten public offering of common stock of the
Company which results in net proceeds to the Company of at least $35,000,000 (a
"QIPO"), Series B Redeemable Convertible Participating Preferred Stock, $.01 par
value ("Preferred Stock"), of the Company and (ii) at or following the
completion of a QIPO, common stock, $.01 par value ("Common Stock"), of the
Company, at an exercise price equal to $7.32 per share (the "Exercise Price"),
or, in case an adjustment of the Exercise Price has taken place pursuant to the
provisions of SECTION 3 below, in each case at the Exercise Price as last
adjusted and in effect on the date this Warrant is exercised.

     This Warrant shall expire at 5:00 p.m., Atlanta, Georgia time, on the third
anniversary of the date of this Warrant (the "Expiration Date").

     Section 1. EXERCISE AND PAYMENT.

         Section 1.1 EXERCISE. On or after the date hereof, the purchase rights
represented by this Warrant may be exercised by the Holder, in whole or in part,
by the surrender of this Warrant (together with a duly executed exercise notice
(the "Notice of Exercise") in the form attached hereto as EXHIBIT A-1) at the
principal office of the Company, and by the payment to the Company, by wire
transfer, of an amount equal to the aggregate Exercise Price of the Shares being
purchased.

         Section 1.2 NET ISSUE ELECTION. The Holder may elect to receive,
without the payment by the Holder of any additional consideration, shares equal
to the value of this Warrant or any portion hereof by the surrender of this
Warrant or such portion (together with a duly executed exercise notice (the "Net
Issue Notice of Exercise") in the form attached hereto as EXHIBIT A-2) at the
principal office of the Company. Thereupon, the Company shall issue to the
Holder such number of shares of Preferred Stock or Common Stock, as applicable,
as is computed using the following formula:

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

where

         X =    the number of shares to be issued to the Holder pursuant to
                this SECTION 1.2.

         Y =    the number of shares covered by this Warrant in respect of
                which the net issue election is made pursuant to this SECTION
                1.2.

         A =    the Fair Market Value of one share of Preferred Stock or Common
                Stock, as applicable, as determined in accordance with
                SECTION 6

                                       2
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                hereof, as at the time the net issue election is made pursuant
                to this SECTION 1.2.

         B =    the Exercise Price in effect under this Warrant at the time the
                net issue election is made pursuant to this SECTION 1.2.

         Section 1.3 STOCK CERTIFICATES. In the event of the exercise of all or
any portion of this Warrant, certificates for the shares of Preferred Stock or
Common Stock, as applicable, so purchased shall be delivered to the Holder by
the Company at its own expense (including the payment by the Company of any
applicable issue taxes or governmental charges imposed in connection with the
issuance or delivery of the Preferred Stock or Common Stock, as applicable, but
excluding applicable transfer taxes if the shares of Preferred Stock or Common
Stock, as applicable, are to be issued to anyone other than the registered
holder of this Warrant) within a reasonable time, which shall in no event be
later than fifteen (15) days thereafter and, unless this Warrant has been fully
exercised or has expired, a new Warrant representing the Shares with respect to
which this Warrant shall not have been exercised shall also be issued to the
Holder within such time.

               If this Warrant shall be surrendered for exercise within any
period during which the transfer books for shares of the Preferred Stock or
Common Stock, as applicable, or other securities purchasable upon the
exercise of this Warrant are closed for any purpose, the Company shall not be
required to make delivery of certificates for the securities purchasable upon
such exercise until the date of the reopening of said transfer books.

     Section 2. STOCK FULLY PAID; RESERVATION OF SHARES. All of the Shares
issuable upon the exercise of this Warrant will, upon issuance and receipt of
the Exercise Price therefor, be fully paid and nonassessable with no personal
liability attaching to the ownership thereof, and free and clear of all taxes,
liens, encumbrances and charges with respect to the issue thereof. During the
period within which this Warrant may be exercised, the Company shall at all
times have authorized and reserved for issuance sufficient shares of its
Preferred Stock or Common Stock, as applicable, to provide for the exercise of
this Warrant.

     Section 3. ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF SHARES. The number
and kind of securities purchasable upon the exercise of this Warrant and the
Exercise Price therefor shall be subject to adjustment from time to time upon
the occurrence of certain events, as follows:

         Section 3.1 ADJUSTMENTS FOR SUBDIVISIONS OF PREFERRED STOCK OR COMMON
STOCK, AS APPLICABLE. If the number of shares of Preferred Stock or Common
Stock, as applicable, outstanding at any time is increased by a stock dividend
payable in shares of Preferred Stock or Common Stock, as applicable, or by a
subdivision or split up of stock, then the Exercise Price then in effect shall,
concurrently with the effectiveness of such dividend, subdivision or split up,
be proportionately decreased so that the number of shares of Preferred Stock or
Common Stock, as applicable, issuable upon exercise of

                                       3
<PAGE>

this Warrant shall be increased in proportion to such increase of outstanding
shares of Preferred Stock or Common Stock, as applicable.

         Section 3.2 ADJUSTMENTS FOR COMBINATIONS OF PREFERRED STOCK OR COMMON
STOCK, AS APPLICABLE. If the number of shares of Preferred Stock or Common
Stock, as applicable, outstanding at any time is decreased by a combination of
the outstanding shares of Preferred Stock or Common Stock, as applicable, then
the Exercise Price then in effect shall, concurrently with the effectiveness of
such combination, be proportionately increased so that the number of shares of
Preferred Stock or Common Stock, as applicable, issuable upon exercise of this
Warrant shall be decreased in proportion to such decrease in outstanding shares
of Preferred Stock or Common Stock, as applicable.

         Section 3.3 ADJUSTMENTS FOR STOCK DIVIDENDS AND OTHER DISTRIBUTIONS. In
the event the Company at any time or from time to time makes or fixes a record
date for the determination of holders of Preferred Stock or Common Stock, as
applicable, entitled to receive any distribution (excluding any repurchases of
securities by the Company not made on a pro rata basis from all holders of any
class of the Company securities) payable in property (other than cash) or in
securities of the Company (other than shares of Preferred Stock or Common Stock,
as applicable), then and in each such event this Warrant shall represent the
right to acquire, in addition to the number of shares of the security receivable
upon the exercise of this Warrant, and without payment of any additional
consideration therefor, the amount of such property (other than cash) or
securities of the Company (other than shares of Preferred Stock or Common Stock,
as applicable) that the Holder would hold on the date of such exercise had it
been the holder of record of the security receivable upon the exercise of this
Warrant on the date hereof and had thereafter, during the period from the date
hereof to and including the date of such exercise, retained such property (other
than cash) or securities of the Company (other than shares of Preferred Stock or
Common Stock, as applicable) during such period.

         Section 3.4 ADJUSTMENTS FOR RECLASSIFICATION, EXCHANGE AND
SUBSTITUTION. Except as provided in SECTION 5 upon a Notice Event, if the entire
class or series of Preferred Stock or Common Stock, as applicable, issuable upon
exercise of this Warrant shall be changed into the same or a different number of
shares of any other class or classes of stock, whether by capital
reorganization, reclassification or otherwise (other than a subdivision or
combination of shares provided for above) this Warrant shall thereafter be
exercisable into, in lieu of the number of shares of Preferred Stock or Common
Stock, as applicable, which the Holder would otherwise have been entitled to
receive, a number of shares of such other class or classes of stock equivalent
to the number of shares of Preferred Stock or Common Stock, as applicable, that
would have been subject to receipt by the Holder upon exercise of this Warrant
immediately before that change. In addition, to the extent applicable in any
reorganization or recapitalization, provision shall be made so that the Holder
of this Warrant shall thereafter be entitled to receive upon exercise of this
Warrant the number of shares of stock or other securities or property of the
Company or otherwise, to which a holder of Preferred Stock or Common

                                       4
<PAGE>

Stock, as applicable, deliverable upon exercise would have been entitled on such
reorganization or recapitalization

         Section 3.5 CERTIFICATE AS TO ADJUSTMENTS. In the case of any
adjustment in the Exercise Price or number and type of securities issuable upon
exercise of this Warrant, the Company will promptly give written notice to the
Holder in the form of a certificate, certified and confirmed by an officer of
the Company, setting forth the adjustment in reasonable detail.

         Section 4. MERGER, CONSOLIDATION, OR LIQUIDATION; QIPO.

               (i)  If (A) the Company consolidates with or merges into another
entity and is not the survivor, or sells or conveys substantially all of its
property, and (B) in connection therewith, shares of stock, other securities,
property, or cash (collectively, "Merger Consideration") are issuable or
deliverable in exchange for the Company's capital stock, then (C) the Company
shall give the Holder at least 10 days prior written notice of the consummation
of such transaction and (D) the Holder may thereafter acquire in lieu of the
shares of Preferred Stock or Common Stock, as applicable, issuable upon exercise
of this Warrant the Merger Consideration which the Holder could have received
had the Holder then exercised this Warrant in its entirety.

               (ii) If the Company receives notice that a purchase, tender or
exchange offer has been made to the holders of more than 50% of the outstanding
Preferred Stock or Common Stock, as applicable, (on an as converted basis), the
Company shall give the Holder reasonable notice thereof.

               (iii) The Company shall give the Holder reasonable prior written
notice of the completion of a QIPO.

         Section 5. NOTICE OF CERTAIN EVENTS. In the event (a "Notice Event"):
(a) the Company authorizes the issuance to all holders of any class of its
capital stock rights or warrants to subscribe for or purchase shares of its
capital stock, or any other subscription rights or warrants; (b) the Company
authorizes the distribution to all holders of any class of its capital stock
evidences of indebtedness or assets; (c) of any capital reorganization or
reclassification of the Shares or the Company's Preferred Stock or Common
Stock, as applicable; other than a subdivision or combination of the
outstanding Preferred Stock or Common Stock, as applicable, and other than a
change in par value of the Preferred Stock or Common Stock, as applicable; (d)
 of any liquidation or merger to which the Company is a party and for which
approval of any of the Company's stockholders is required, other than a
consolidation or merger in which the Company is a continuing corporation and
that does not result in any reclassification or change of the shares of
Preferred Stock or Common Stock, as applicable, issuable upon the exercise of
this Warrant; (e) of the conveyance or transfer of the Company's properties
and assets, substantially as an entirety;
or (f) of the Company's voluntary or involuntary dissolution, liquidation or
winding-up; then the Company shall cause to be mailed by certified mail to the
Holder, at least 10 days prior to the applicable record or effective date
hereinafter specified, a notice stating the dates as of which (x) the holders of
capital stock of record to be entitled to

                                       5
<PAGE>

receive any such rights, warrants or distributions are to be determined, (y)
such Notice Event is expected to become effective, and (z) it is expected that
Holders of record of Warrants shall be entitled to exchange or sell their shares
of Preferred Stock or Common Stock, as applicable, issuable upon the exercise of
this Warrant for securities or other property, if any, deliverable upon such
Notice Event.

     Section 6. FRACTIONAL SHARES. No fractional shares of Preferred Stock or
Common Stock, as applicable, will be issued in connection with any exercise
hereunder. In lieu of such fractional shares the Company shall make a cash
payment therefor based upon the Fair Market Value (as defined below) of the
Preferred Stock or Common Stock, as applicable, on such date. For the purposes
hereof "Fair Market Value" of a share of Preferred Stock or Common Stock, as
applicable, as of a particular date means: (a) if traded on an exchange or the
over-the-counter market, quoted on the Nasdaq National Market or reported by the
National Quotation Bureau, then the most recently reported closing or bid price,
(b) if conversion or exercise is simultaneous with an underwritten public
offering registered under the Act, the initial public offering price (before
deducting commissions, discounts or expenses) per share sold in such offer, and
(c) otherwise, the price, not less than book value, determined in good faith and
in such reasonable manner as prescribed by a majority of Company's Directors,
including at least one director who is not a Company officer or employee (the
"Outside Director").

     Section 7. RESTRICTIONS ON TRANSFER.

          Section 7.1 RESTRICTIVE LEGEND. Each certificate representing (i) the
Shares and (ii) any other securities issued in respect of the Shares upon any
stock split, stock dividend or recapitalization (collectively, the "Restricted
Securities"), shall be endorsed as follows:

          THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
          AND SUCH SECURITIES MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR
          DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR AN EXEMPTION UNDER
          THE ACT AND THE RULES AND REGULATIONS THEREUNDER. THE SALE OR OTHER
          DISPOSITION OF THE SECURITIES REPRESENTED BY THIS CERTIFICATE IS
          RESTRICTED BY A RIGHT OF FIRST OFFER AND CO-SALE AGREEMENT, AS
          AMENDED, FROM TIME TO TIME, AMONG CERTAIN STOCKHOLDERS OF THE ISSUER
          AND THE ISSUER (THE "AGREEMENT"). A COPY OF THE AGREEMENT IS AVAILABLE
          FOR INSPECTION DURING NORMAL BUSINESS HOURS AT THE PRINCIPAL EXECUTIVE
          OFFICE OF THE ISSUER.

          Section 7.2 OWNERSHIP OF WARRANT. The Company may deem and treat the
person in whose name this Warrant is registered as the holder and owner hereof

                                       6
<PAGE>

(notwithstanding any notations of ownership or writing hereon made by any person
other than the Company) for all purposes and shall not be affected by any notice
to the contrary, until presentation of this Warrant for registration of transfer
as provided in this SECTION 7.

          Section 7.3 TRANSFERS. As a condition to the transfer of this Warrant,
each transferee shall execute an assignment substantially in the form attached
hereto as Exhibit B. The Holder may transfer this Warrant subject to compliance
with the terms of the Right of First Offer and Co-Sale Agreement dated as of May
12, 1999 among the Company, Nortel Networks Inc. ("Nortel") and the purchasers
name therein, as amended. The Company may not assign its obligations under this
Warrant without the prior written consent of the Holder.

     Section 8. NO RIGHTS OF STOCKHOLDERS. This Warrant does not entitle the
Holder to any voting rights as a stockholder of the Company prior to the
exercise of the Warrant; further, the Holder has no liability as to the Exercise
Price.

     Section 9. NO IMPAIRMENT. The Company will not, by amendment of its
Certificate of Incorporation, as amended, or through any 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 hereunder by the
Company, but it will at all times in good faith assist in the carrying out of
all of the provisions of this Warrant and in the taking of all such action as
may be necessary or appropriate in order to protect the rights of the holder of
this Warrant against impairment.

     Section 10. 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, in
lieu of this Warrant.

     Section 11. 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, then such
action may be taken or such right may be exercised on the next succeeding day
not a Saturday or a Sunday or a legal holiday.

     Section 12. MISCELLANEOUS.

          Section 12.1 GOVERNING LAW. This Warrant shall be governed by and
construed in all respects in accordance with the laws of the State of Georgia
without giving effect to the conflicts of laws provisions thereof.

          Section 12.2 ENTIRE AGREEMENT; AMENDMENT. This Warrant
constitutes the full and entire understanding and agreement between the parties
with regard to the

                                       7
<PAGE>

subject hereof. Neither this Warrant nor any term hereof may be amended, waived,
discharged, or terminated other than by a written instrument signed by the party
against whom enforcement of any such amendment, waiver, discharge or termination
is sought.

          Section 12.3 SUCCESSORS AND ASSIGNS. Except as otherwise provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the permitted successors and assigns, heirs, executors, and administrators
of the Company and the Holder.

          Section 12.4 NOTICES, ETC. All notices and other communications
required or permitted hereunder shall be in writing and shall be mailed by
registered or certified mail, postage prepaid, by overnight courier, or
otherwise delivered by hand or by messenger or sent by facsimile and confirmed
by mail, addressed:

               (i)  if to the Company, at the address of the Company set forth
on the signature page of this Warrant, Attention: Chief Executive Officer with a
copy to W. Tinley Anderson, III, Esq., Hunton & Williams, Bank of America Plaza,
Suite 4100, 600 Peachtree Street, N.E., Atlanta, Georgia 30308; and

               (ii) if to the Holder, at the address of such Holder set forth on
the signature page of this Warrant, with a copy to E. Ann Gill, Esq., Dewey
Ballantine LLP, 1301 Avenue of the Americas, New York, New York 10019.

Each of such notice or other communication shall for all purposes of this
Agreement be treated as effective or having been given when delivered if
delivered personally, or, if sent by mail or by Federal Express or other
reputable overnight carrier, upon receipt.

          Section 12.5 REGISTRATION RIGHTS. With respect to the Shares received
upon any exercise of this Warrant, Pequot Private Equity Fund II, L.P. and its
successors and assigns pursuant to Section 4 of the Investor Rights Agreement
dated as of May 12, 1999 by and among the Company, Nortel and the other parties
thereto, as amended (the "Investor Rights Agreement") shall have the
registration rights set forth in Section 2 of the Investor Rights Agreement.

          Section 12.6 HSR ACT. The issuance of the Shares pursuant to the
exercise of this Warrant is subject to the expiration or termination of any
applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act
of 1976, as amended, and the Company shall use its reasonable commercial efforts
to obtain such expiration or termination.

         [THE REMAINDER OF THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK.]

                                       8
<PAGE>

Issued this 4th day of August, 2000.

                                     ELASTIC NETWORKS INC.

                                     By: /s/ Kevin D. Elop
                                        --------------------------------------
                                        Kevin D. Elop, Chief Financial Officer

                                             Address: 6120 Windward Parkway
                                                      Suite 100
                                                      Alpharetta, Georgia 30005

WARRANT HOLDER:

PEQUOT PRIVATE EQUITY FUND II, L.P.

By: Pequot Capital Management, Inc.,
     its Investment Manager

By: /s/ Kevin E. O'Brien
   ----------------------------------
   Kevin E. O'Brien, General Counsel

Address: 500 Nyala Farm Road
         Westport, Connecticut 06880
         Attention:  David J. Malat and Carol Holley

                                       9
<PAGE>

            THE EXERCISE OF THIS WARRANT IS SUBJECT TO THE APPLICABLE
                 REQUIREMENTS OF THE HART-SCOTT-RODINO ANTITRUST
                      IMPROVEMENTS ACT OF 1976, AS AMENDED.

                                   EXHIBIT A-1

                               NOTICE OF EXERCISE

TO:  ELASTIC NETWORKS INC.

     Attention: Chief Financial Officer

     1.   The undersigned hereby elects to purchase _________ shares of
[Preferred Stock or Common Stock, as applicable] of ELASTIC NETWORKS INC.
pursuant to the terms of this Warrant, and tenders herewith payment of the
purchase price of such shares in full.

     2.   Please issue a certificate or certificates representing said shares of
[Preferred Stock or Common Stock, as applicable] in the name of the undersigned
or in such other name as is specified below:

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

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

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

                                            ------------------------------------
                                                       (Signature)
                                           Title:_______________________________

------------------------
         (Date)

                                       10
<PAGE>

            THE EXERCISE OF THIS WARRANT IS SUBJECT TO THE APPLICABLE
                 REQUIREMENTS OF THE HART-SCOTT-RODINO ANTITRUST
                      IMPROVEMENTS ACT OF 1976, AS AMENDED.

                                   EXHIBIT A-2

                          NET ISSUE NOTICE OF EXERCISE

TO:  ELASTIC NETWORKS INC.

     Attention: Chief Financial Officer

     1.   The undersigned hereby elects to purchase _________ shares of
[Preferred Stock or Common Stock, as applicable] of ELASTIC NETWORKS INC.
pursuant to the terms of this Warrant, and hereby elects under SECTION 1.2 to
surrender the right to purchase _______ shares of [Preferred Stock or Common
Stock, as applicable] pursuant to this Warrant for a net issue exercise with
respect to ________ shares of [Preferred Stock or Common Stock, as applicable].

     2.   Please issue a certificate or certificates representing said shares of
[Preferred Stock or Common Stock, as applicable] in the name of the undersigned
or in such other name as is specified below:

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

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

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

                                            ------------------------------------
                                                        (Signature)

                                           Title:_______________________________

-----------------------
       (Date)

                                       11
<PAGE>

                                    EXHIBIT B

                                 ASSIGNMENT FORM
                  (To be signed only upon transfer of Warrant)

     FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto ______________________________ (the "Transferee") whose address is
_____________________, the right represented by the attached Warrant to purchase
_________ shares of [Preferred Stock or Common Stock, as applicable] of ELASTIC
NETWORKS INC., to which the attached Warrant relates.

     Dated:____________________

                                     ------------------------------------------
                                     (Signature must conform in all respects to
                                     name of Holder as specified on the face of
                                     the Warrant)

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

Signed in the presence of:

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

                                       12

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