Document:

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                                                                   EXHIBIT 10.31

                           FORM OF AMENDMENT NO. 1 TO
                         PURCHASE MONEY PROMISSORY NOTE

         This AMENDMENT NO. 1 (this "Amendment") DATED AS OF JUNE 19, 2002 TO
THE PURCHASE MONEY PROMISSORY NOTE DATED AS OF ___, 2000, AS AMENDED (the
"Note"), by and between TELLIUM, INC., a Delaware corporation (the "Company"),
having its address at 2 Crescent Place, Oceanport, New Jersey 07757, and the
undersigned (the "Borrower").

         WHEREAS, the Company and the Borrower are parties to the Note;

         WHEREAS, in October 2001, the Company and the Borrower agreed to amend
the Note, as set forth in ss.ss. 3 and 4 below, but did not reduce such
agreement to writing; and

         WHEREAS, the Company and the Borrower wish to reduce such agreement to
writing and further amend the Note, this Amendment to be effective as of June
19, 2002, except for ss.ss. 3 and 4 below, which are to be effective as of
October 1, 2001.

         NOW, THEREFORE, in consideration of the foregoing premises and the
mutual covenants herein contained and for other good and valuable consideration,
the receipt and adequacy of which are hereby acknowledged, the parties hereto,
intending to be legally bound, agree as follows:

         1. Capitalized terms used and not otherwise defined in this Amendment
shall have the meanings given to such terms in the Note.

         2. This Amendment is effective as of June 19, 2002, except for ss.ss.3
and 4 below, which were effective as of October 1, 2001.

         3. The second sentence of Section 1 of the Note is hereby amended and
restated to read as follows:

         The interest rate shall float on a quarterly basis and shall equal the
         Internal Revenue Service established short-term Applicable Federal Rate
         for a quarterly compounding period effective for the first month in
         such quarterly period and published in a Revenue Ruling in the
         Cumulative Bulletin in the month preceding the first month in such
         quarterly period, provided that the rate shall not be less than 2.5%
         per annum nor exceed 7.5% per annum.

         4. The definition of Termination Date is hereby amended and restated to
be the fifth anniversary of the date of the Note.

         5. The Company agrees that all payments due under and in connection
with the Note or any other documents or other agreements executed in connection
therewith, or any notes,

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instruments or other evidence of indebtedness issued in exchange therefore or
upon conversion or refinancing thereof (including, without limitation, all
principal, interest, fees, charges, indemnities, costs, expenses, and other
indebtedness arising under or incidental to the Note), collectively (the
"Subordinated Debt"), are subordinated to the prior payment in full of all
present and future obligations, liabilities and indebtedness of the Borrower,
whether now or hereafter due, incurred or created in connection with (i) any
mortgage, home equity, or home improvement loan or similar obligation of the
Borrower, (ii) any consumer credit (as defined in the Truth in Lending Act (15
U.S.C. 1602), as amended from time to time) and (iii) any credit and charge
cards of the Borrower (i, ii, and iii collectively, the "Senior Debt"). Such
subordination is for the benefit of the creditors to whom the Senior Debt is
owed (the "Senior Creditors"). The Company hereby agrees to enter into a
subordination agreement at the request of any Senior Creditor.

         6. The payment of principal and accrued interest on the Note shall be
due in the following installments over five (5) years beginning on the
Termination Date:

         (i) Ten percent (10 %) of the principal and accrued interest shall be
         due on the first year anniversary of the Termination Date;

         (ii) Fifteen percent (15%) of the principal and accrued interest shall
         be due on the second year anniversary of the Termination Date;

         (iii) Twenty percent (20%) of the principal and accrued interest shall
         be due on the third year anniversary of the Termination Date;

         (iv) Twenty-five percent (25%) of the principal and accrued interest
         shall be due on the fourth year anniversary of the Termination Date;
         and

         (v) The remaining balance of the principal and accrued interest shall
         be due on the fifth year anniversary of the Termination Date.

         7. Continuing Effect; No other Amendments. Except as expressly provided
herein, all of the terms and provisions of the Note are and shall remain in full
force and effect. This Amendment is limited to the specific definitions and
sections of the Note specified herein and shall not constitute a consent, waiver
of amendment of, or an indication of the Company's or the Borrower's willingness
to consent to any action requiring consent under or to waive or amend any other
provision of the Note.

         8. Counterparts. This Amendment may be executed in counterparts, each
of which shall be deemed to be an original, but all of which, when taken
together, shall constitute one and the same instrument.

                                     * * * *

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         IN WITNESS WHEREOF, the parties have executed this Amendment on the day
and year first above written.

                            THE COMPANY:

                            TELLIUM, INC.

                            By:
                                 -------------------------------
                                 Name: Michael J. Losch
                                 Title: Chief Financial Officer, Secretary and
                                 Treasurer

                            THE BORROWER:

                            ------------------------------------
                            Name:<PAGE>

                                                                   Exhibit 10.32

                                 -CONFIDENTIAL-

                             ASSIGNMENT OF WARRANTS

         This Assignment of Warrants (this "Assignment") is entered into
effective as of June 26, 2002, by and between Dynegy Connect, L.P., a Delaware
limited partnership (Assignor"), and Tellium, Inc., a Delaware corporation
("Assignee," together with Assignor, the "Parties").

                                R E C I T A L S:

         WHEREAS, Extant, Inc. ("Extant") and Assignee entered into a Purchase
Agreement, made as of September 21, 1999 (as amended, the "Purchase Agreement");
and

         WHEREAS, Extant was acquired by and merged into an affiliate of
Assignor, Dynegy Global Communications, Inc. ("Dynegy Global"), on September 29,
2000; and

         WHEREAS, as part of the merger, substantially all of the assets
formerly held by Extant were contributed by Dynegy Global to Dynegy Connect,
L.P., a Delaware limited partnership owned 80% by subsidiaries of Dynegy Inc.
and 20% by a subsidiary of Telstra, Inc.; and

         WHEREAS, the contributed assets included the Purchase Agreement, except
for the beneficial rights under the warrants granted by Assignee as part of the
Purchase Agreement (the "Warrants"); and

         WHEREAS, the Warrants are now beneficially owned by Assignor (80%) and
Telstra Holdings Pty Limited (20%); and

         WHEREAS, Assignor wishes to sell, assign, transfer, and deliver to
Assignee, and Assignee desires to purchase and receive from Assignor, all of
Assignor's rights, title, and interest in and to the Warrants on the terms set
forth herein;

                              A G R E E M E N T:

         NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants set forth herein, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby mutually acknowledged, the Parties,
intending to be legally bound, hereby agree as follows:

         1. Transfer of Warrants. Subject to the provisions hereof and the
relevant provisions of the Purchase Agreement, Assignor hereby sells, assigns,
transfers, and delivers to Assignee, and Assignee hereby accepts and assumes
from Assignor, all of Assignor's right, title and interest in and to, and al of
Assignor's obligations and liabilities with respect to, the Warrants to purchase
4,180,800 shares of common stock of Tellium, Inc., par value $0.001 per share
(the

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"Assumed Obligations"). Assignee agrees to be bound by and to comply with the
provisions of the Purchase Agreement applicable to it as a substituted
beneficial owner of the Warrants. Without limiting Section 4 below, Assignee
agrees to use commercially reasonable efforts to take all actions necessary to
complete the assignment and transfer of the Warrants in accordance with this
Assignment, the Purchase Agreement, the other documents relating to the
Warrants, Assignee's formation and governance documents, including the stock
register, and all applicable laws.

         2. Consideration. On or before June 26, 2002, Assignee shall pay to
Assignor the sum of FIVE MILLION FIVE HUNDRED THOUSAND DOLLARS ($5,500,000)
("Warrant Purchase Price") for its acquisition of all of Assignor's right,
title, and interest in and to the Warrants and its assumption of the Assumed
Obligations. Payment of the Warrant Purchase Price shall be made by wire
transfer of immediately available funds, in the currency of the United States of
America, to the account designated by Assignor.

         3. Representations. Assignor represents and warrants to Assignee that
Assignor has the right to transfer all of its rights, title, and interest in and
to the Warrants, subject to the terms hereof and the terms of the Purchase
Agreement, and further represents and warrants that there are no liens on its
rights, title, and interest in the Warrants exclusive to the Warrants. Assignor
represents and warrants to Assignee that the execution, delivery, and
performance of the Assignment are within its powers, have been duly authorized
by all necessary action, and do not violate its governing documents, or any
binding agreement between it and any third party (other than Assignee). The
Assignee represents and warrants to Assignor that, by assignment hereof, this
Warrant and the shares of Common Stock to be issued upon exercise hereof are
being acquired for investment and that the Assignee shall not offer, sell, or
otherwise dispose of this Warrant or any shares of stock to be issued upon
exercise hereof except under circumstances which will not result in a violation
of the Securities Act of 1933, as amended, or any state securities laws. THE
PARTIES MAKE NO OTHER REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE
WARRANTS, ANY OF ITS RIGHTS, TITLE, OR INTERESTS THEREIN OR THERETO, OR THIS
ASSIGNMENT, AND ALL SUCH OTHER REPRESENTATIONS AND WARRANTIES, OF ANY KIND OR
CHARACTER, ARE EXPRESSLY DISCLAIMED.

         4. Further Assurances. Each Party, upon request of the other Party,
agrees to execute and deliver such further documents and instruments, and to
perform such further acts, as may be necessary and commercially reasonable to
accomplish and give full effect to this Assignment and the transfer contemplated
hereunder of Assignor's rights, title, and interest in and to, and the Assumed
Obligations with respect to, the Warrants.

         5. Confidentiality; Public Statements.

         (a) Each Party will maintain in confidence, and cause its affiliates
and their respective officers, directors, partners, members, employees, agents,
representatives, and lenders to maintain in confidence, any written, oral or
other information obtained in confidence from the other Party in connection with
this Assignment or the transactions contemplated hereby unless such information
is already known to such Party, is obtained from a person not otherwise bound

                                       -2-

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by a duty of confidentiality, becomes publicly available through no breach of
this Assignment by such Party, or unless the use of such information is
necessary in making any government filing or obtaining any government consent or
approval required for the consummation of the transactions contemplated hereby,
or unless the furnishing or use of such information is required by any legal
proceeding, rule, regulation, applicable law, or the rules of any stock
exchange, provided that prior to furnishing or using such information in
connection with any legal proceeding, rule, regulation, applicable law, or the
rules of any stock exchange, the disclosing Party shall give the non-disclosing
Party prompt written notice in advance of the required disclosure so that an
appropriate protective order may be sought by the non-disclosing Party, if
appropriate. Notwithstanding the foregoing, this Section 5(a) shall not affect
any other confidentiality agreement between the Parties.

         (b) Before a Party or any of their affiliates releases any information
concerning this Assignment or the transactions or matters contemplated hereby
which is intended for or may result in public dissemination thereof, it shall
cooperate with the other Party, shall furnish drafts of all documents or
proposed oral statements to the other Party, provide the other Party the
opportunity to review and comment upon any such documents or statements, and
shall not release or permit the release of any such information without the
written consent of the other Party, except to the extent required by any legal
proceeding, rule, regulation, applicable law or the rules of any securities
exchange or automated quotation system on which its securities or those of its
affiliate are traded.

         6. Release and Indemnity

         (a) Assignee (on behalf of itself and its affiliates) does hereby
release, acquit, and forever discharge Assignor, its affiliates, and their
respective officers, directors, partners, members, employees, agents,
representatives, and lenders (collectively, "Dynegy Released Persons") from any
and all demands, claims, suits, actions, proceedings, and investigations, at
common law, statutory, contractual or otherwise, known or unknown, contingent or
otherwise, suspected or unsuspected, asserted or unasserted, and whether arising
out of written documents, unwritten undertakings, course of conduct, tort,
violations of laws or regulations or otherwise, which the Assignee currently has
or might have against the Dynegy Released Persons, that now exist or may arise
in the future out of any Assumed Obligation (collectively "Claims"). THE CLAIMS
RELEASED SHALL ALSO INCLUDE THOSE CLAIMS ARISING OUT OF THE STRICT LIABILITY OR
THE NEGLIGENCE OF ANY PARTY, INCLUDING BUT NOT LIMITED TO THE DYNEGY RELEASED
PERSONS, WHETHER SUCH NEGLIGENCE BE SOLE, JOINT OR CONCURRENT, ACTIVE OR
PASSIVE. Neither Assignee nor any of its affiliates shall file or bring any
Claim in or before any city, state, federal, or other government court or agency
or arbitration tribunal with respect to any Claim. Assignee shall not transfer
any Claim to any third party.

         (b) Assignee shall defend, indemnify, and hold harmless the Dynegy
Released Persons from and against (i) any and all Claims released herein that
may at any time be asserted by Assignee or by any other person or entity, by
assignment, subrogation or otherwise, by, through, under or on behalf of
Assignee, and for all judgments, damages, losses, fines, penalties, costs, and
expenses, including, without limitation, legal expenses (collectively, "Losses")

                                       -3-

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suffered or incurred by the Dynegy Released Persons in defending against any
Claims, except for Claims or Losses brought by third parties contesting
Assignor's right, title, and interest in the Warrants. The indemnification
rights under this Section 6(b) are independent of and in addition to such rights
and remedies as Assignor and the other Dynegy Released Persons may have at law
or in equity or otherwise for any misrepresentation, breach of warranty, or
failure to fulfill, satisfy, or comply with any agreement, covenant, obligation,
or condition hereunder by Assignee, none of which rights or remedies shall be
affected or diminished hereby.

         7. Miscellaneous.

         (a) Except as otherwise provided or contemplated herein, (i) nothing in
this Assignment, expressed or implied, shall give or be construed to give any
person or entity, other than the Parties and their successors and assigns, any
legal or equitable right, remedy, or claim under or in respect to this
Assignment or under any covenant, condition or provision contained herein, and
(ii) all such covenants, conditions and provisions shall be for the sole benefit
of the Parties.

         (b) EACH PARTY ACKNOWLEDGES AND AGREES (I) THAT IT IS CHARGED WITH
NOTICE AND KNOWLEDGE OF THE TERMS HEREOF, AND (II) THAT IT HAS READ THIS
ASSIGNMENT AND IS FULLY INFORMED AND HAS FULL NOTICE AND KNOWLEDGE OF THE TERMS,
CONDITIONS, AND EFFECT OF THIS ASSIGNMENT. EACH PARTY FURTHER AGREES THAT IT
WILL NOT CONTEST THE VALIDITY OR ENFORCEABILITY OF ANY PROVISONS OF THIS
ASSIGNMENT ON THE BASIS THAT THE PARTY HAD NO NOTICE OR KNOWLEDGE OF SUCH
PROVISION OR THAT SUCH PROVISION IS NOT "CONSPICUOUS".

         (c) Any waiver of any provision of this Assignment must be specifically
expressed in a written agreement signed by the Parties. No waiver, express or
implied, by any Party of any breach or default by the other Party in the
performance of its obligations hereunder shall be deemed or construed to be a
waiver of any other breach or default under this Assignment. Failure on the part
of any Party to complain of any act or omission of any other Party, or to
declare such other party in default irrespective of how long such failure
continues, shall not constitute a waiver hereunder. No notice to or demand on a
defaulting Party shall entitle such defaulting Party to any other or further
notice or demand in similar or other circumstances.

         (d) This Assignment shall be binding upon and inure to the benefit of
the Parties, their legal representatives, and permitted successors and assigns.
This Assignment may not be assigned by a Party without the other Party's written
consent, which shall not be unreasonably withheld or delayed.

         (e) This Assignment shall be subject to, governed by, and construed in
accordance with, the substantive and procedural laws of the state of Texas,
without reference to its principles of conflict of laws.

                                       -4-

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         (f) The terms of this Assignment may not be modified, amended, or
otherwise changed except pursuant to a written agreement signed by both Parties.

         (g) This Assignment may be executed in one or more counterparts, all of
which when taken together shall constitute one and the same instrument. All such
counterparts together shall constitute one instrument.

         (h) All notices, demands, and consents provided for in this Assignment
shall be in writing and shall be given to the Parties at the addresses set forth
below, or at such other addresses as the Party may hereafter specify in writing.

         If to Assignor:

                  Dynegy Connect, L.P.
                  1000 Louisiana, suite 5800
                  Houston, Texas  77002
                  Attn:  James E. Miller
                  Fax:  (713) 767-5010

                  With a copy to:

                  Dynegy Connect, L.P.
                  6446 S. Kenton Street, Suite 170
                  Englewood, CO  80111
                  Attn:  Legal Counsel
                  Fax:  (720) 833-6499

         If to Assignee:

                  Tellium, Inc.
                  2 Crescent Place
                  P.O. Box 901
                  Oceanport, NJ  07757-0901
                  Attn:  President
                  Fax:  (732) 923-9805

Such notices may be delivered by hand or by telex or facsimile or may be mailed,
postage prepaid, by certified or registered mail, by a deposit in a depository
for the receipt of mail regularly maintained by the United States Postal
Service. All notices which are hand delivered or delivered by telex, telegram or
telecopy during the recipient's normal business hours shall be deemed given on
the date of delivery. Notices delivered after normal business hours shall be
deemed given on the business day following the date of delivery. Except as
otherwise provided herein, all notices which are mailed in the manner provided
above shall be deemed given upon receipt.

                                       -5-

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         (i) Each Party shall bear its own expenses and costs incurred in
connection with the preparation, execution, and performance of this Assignment
and the transactions contemplated hereby, including, without limitation, all
fees and expenses of agents, representatives, counsel, and accountants.
Notwithstanding the foregoing, all sales, transfer, and other taxes, fees, or
charges (other than income taxes) arising from, or attributable or related to,
the sale, transfer or assignment to Assignee pursuant to this Assignment
("Taxes") shall be borne by Assignee, and Assignee shall defend, indemnify, and
hold harmless Assignor, its affiliates, and their respective officers,
directors, partners, members, employees, agents, and representatives from and
against any Claims for Taxes and any associated Losses.

         IN WITNESS WHEREOF, Assignor and Assignee have caused this Assignment
to be duly executed as of and on the date first written above by their duly
authorized officers.

                             TELLIUM, INC.

                             By:      /s/ Michael J. Losch
                                ------------------------------------------------
                             Name:  Michael J. Losch
                             Title: CFO, Secretary and Treasurer

                             DYNEGY CONNECT, L.P.

                             By:      /s/ Ken Snyder
                                ------------------------------------------------
                             Name:   Ken Snyder
                             Title:  President

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