Document:

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                                                                   EXHIBIT 10.20

                       FORM OF INDEMNIFICATION AGREEMENT

         INDEMNIFICATION AGREEMENT dated as of January 1, 2001, by and between
Northfield Laboratories Inc., a Delaware corporation (the "Company"), and the
undersigned executive officer of the Company (the "Indemnified Party").

         The Indemnified Party serves as an executive officer of the Company.
The Company's Certificate of Incorporation permits the Company to indemnify the
directors, officers, employees and agents of the Company. The Company's
Certificate of Incorporation and Section 145 of the Delaware General Corporation
Law, as amended from time to time (the "Delaware Law"), also permit agreements
between the Company and its directors, officers, employees and agents for the
indemnification of such persons by the Company.

         In recognition of the past services provided to the Company by the
Indemnified Party, and in order to induce the Indemnified Party to continue to
serve as an officer of the Company, the Company has determined to enter into
this Agreement with the Indemnified Party.

         NOW, THEREFORE, in consideration of the Indemnified Party's continued
service as an officer of the Company, the parties hereto agree as follows:

         Section 1. Definitions. For purposes of this Agreement:

         "Change in Control" means a change in control of the Company of a
nature that would be required to be reported in response to Item 1(a) of the
Current Report on Form 8-K, as in effect as of the date of this Agreement,
promulgated pursuant to Section 13 or 15(d) of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), whether or not the Company is then
subject to the reporting requirements of the Exchange Act; provided that,
without limitation, such a change in control will be deemed to have occurred if:

                  (a) there is consummated any sale, lease, exchange or other
         transfer (in one transaction or a series of related transactions) of
         all or substantially all of the Company's assets;

                  (b) the stockholders of the Company approve any plan or
         proposal of liquidation or dissolution of the Company;

                  (c) there is consummated any consolidation or merger of the
         Company in which the Company is not the surviving or continuing
         corporation, or pursuant to which shares of the Company's Common Stock
         would be converted into cash, securities or other property, other than
         a merger of the Company in which the holders of the Company's Common
         Stock immediately prior to the merger have, directly or indirectly, at
         least an 80% ownership interest in the outstanding Common Stock of the
         surviving corporation immediately after the merger;

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                  (d) any "person" or "group" (as such terms are used in Section
         13(d) and 14(d) of the Exchange Act) becomes the "beneficial owner" (as
         defined in Rule 13d-3 under the Exchange Act), directly or indirectly,
         of securities of the Company representing 15% or more of the combined
         voting power of the Company's then outstanding voting securities
         ordinarily having the right to vote for the election of directors; or

                  (e) individuals who, as of the date of this Agreement,
         constitute the Board of Directors of the Company (the "Board"
         generally, and as of the date hereof, the "Incumbent Board") cease for
         any reason to constitute a majority of the Board; provided that any
         individual becoming a director subsequent to the date of this Agreement
         whose election, or nomination for election by the Company's
         stockholders, was approved by a vote of at least three-quarters of the
         directors comprising the Incumbent Board will be, for purposes of this
         Agreement, considered as though such individual were a member of the
         Incumbent Board; provided further that, notwithstanding the foregoing,
         an individual whose initial assumption of office as a director is in
         connection with any actual or threatened "solicitation" of "proxies"
         (as such terms are defined in Rule 14a-1 of Regulation 14A promulgated
         under the Exchange Act) by any "person" or "group" (as such terms are
         used in Section 13(d) and 14(d) of the Exchange Act) other than the
         Incumbent Board will not be considered as a member of the Incumbent
         Board for purposes of this Agreement.

         "Disinterested Director" means a director of the Company who is not and
was not a party to the Proceeding with respect to which indemnification is
sought by the Indemnified Party pursuant to this Agreement.

         "Expenses" includes all reasonable attorneys' fees, retainers, court
costs, transcript costs, fees of experts, witness fees, travel expenses,
duplicating costs, printing and binding costs, telephone charges, postage,
delivery service fees, and all other disbursements or expenses of the types
customarily incurred in connection with prosecuting, defending, preparing to
prosecute or defend, investigating, participating in or being or preparing to be
a witness in a Proceeding.

         "Independent Counsel" means a law firm, or a member of a law firm, that
is experienced in matters of corporation law and neither presently is, nor in
the past five years has been, retained to represent (a) the Company or the
Indemnified Party in any matter material to either such party (other than with
respect to matters concerning the Indemnified Party under this Agreement or of
other indemnified parties under similar indemnification agreements), or (b) any
other party to the Proceeding giving rise to a claim for indemnification under
this Agreement. Notwithstanding the foregoing, the term "Independent Counsel"
will not include any person who, under the applicable standards of professional
conduct then prevailing, would have a conflict of interest in representing
either the Company or the Indemnified Party in an action to determine the
Indemnified Party's rights under this Agreement. The Company agrees to pay the
reasonable fees of the Independent Counsel referred to above and to fully
indemnify such counsel against any and all Expenses, claims, liabilities and
damages arising out of or relating to the Agreement or its engagement pursuant
hereto.

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         "Proceeding" means any threatened, pending or completed action, suit,
arbitration, mediation, alternate dispute resolution mechanism, investigation,
inquiry, administrative hearing or any other actual, threatened or completed
proceeding, whether brought by or in the right of the Company or otherwise, and
whether civil, criminal, administrative or investigative, in which the
Indemnified Party was, is or may be involved as a party or otherwise by reason
of the fact that the Indemnified Party is or was a director, officer, employee
or agent of the Company or is or was serving as a director, officer, employee,
agent or fiduciary of any other corporation, partnership, joint venture, trust,
employee benefit plan or other enterprise, in each case whether or not the
Indemnified Party continues to serve in the same capacity at the time any
liability or Expense is incurred for which indemnification may be sought under
this Agreement, including any such proceeding based on events or occurrences
prior to the date of this Agreement.

         Section 2. Indemnification. The Company agrees to indemnify and hold
harmless the Indemnified Party to the full extent authorized or permitted by the
provisions of the Delaware Law and the Company's Certificate of Incorporation.
In furtherance of the foregoing, and without limiting the generality thereof,
the Company agrees to indemnify the Indemnified Party against all Expenses,
judgments, penalties, fines and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with any Proceeding or
any claim, issue or matter therein, if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the Company
and, with respect to any criminal Proceeding, had no reasonable cause to believe
his conduct was unlawful; provided that in connection with any Proceeding by or
in the right of the Company to procure a judgment in its favor, no
indemnification against such Expenses will be made in respect of any claim,
issue or matter in such Proceeding as to which the Indemnified Party is adjudged
to be liable to the Company, unless and to the extent that the Court of Chancery
of the State of the Delaware or the court in which such Proceeding has been
brought or is pending determines that such indemnification may be made. To the
extent that the Indemnified Party is a party to and is successful, on the merits
or otherwise, in any Proceeding, he will be indemnified to the maximum extent
permitted by law against all Expenses actually and reasonably incurred by him or
on his behalf in connection therewith. If the Indemnified Party is not wholly
successful in any Proceeding but is successful, on the merits or otherwise, as
to one or more but less than all claims, issues or matters in such Proceeding,
the Company will indemnify the Indemnified Party against all Expenses actually
and reasonably incurred by him or on his behalf in connection with each
successfully resolved claim, issue or matter. For purposes of this Section 2,
the termination of any claim, issue or matter in such a Proceeding by dismissal,
with or without prejudice, will be deemed to be a successful result as to such
claim, issue or matter.

         Section 3. Indemnification for Expenses as Witness. To the extent the
Indemnified Party is, by reason of the fact that the Indemnified Party is or was
a director, officer, employee or agent of the Company or is or was serving as a
director, officer, employee, agent or fiduciary of any other corporation,
partnership, joint venture, trust, employee benefit plan or other enterprise, a
witness in any action, suit, arbitration, mediation, alternate dispute
resolution mechanism, investigation, inquiry, administrative hearing or other
proceeding, whether civil, criminal, administrative or investigative, to which
the Indemnified Party is not a party, the Company

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agrees to indemnify the Indemnified Party against all Expenses reasonably
incurred by him or on his behalf in connection therewith.

         Section 4. Contribution. If the indemnification provided in Section 2
is unavailable and may not be paid to the Indemnified Party for any reason, then
in respect to any Proceeding in which the Company is jointly liable with the
Indemnified Party (or would be if joined in such Proceeding), the Company agrees
to contribute to the amount of Expenses, judgments, fines and amounts paid in
settlement actually and reasonably incurred and paid or payable by the
Indemnified Party in such proportion as is appropriate to reflect (a) the
relative benefits received by the Company and by the Indemnified Party from the
transaction from which such Proceeding arose and (b) the relative fault of the
Company and the Indemnified Party in connection with the events which resulted
in such Expenses, judgments, fines or settlement amounts, as well as any other
relevant equitable considerations. The relative fault of the Company and the
Indemnified Party will be determined by reference to, among other things, the
parties' relative intent, knowledge, access to information and opportunity to
correct or prevent the circumstances resulting in such Expenses, judgments,
fines or settlement amounts. The Company agrees that it would not be just and
equitable if contribution pursuant to this Section 4 were determined by pro rata
allocation or any other method of allocation that does not take account of the
foregoing equitable considerations.

         Section 5. Advancement of Expenses. The Company agrees to advance all
Expenses reasonably incurred by or on behalf of the Indemnified Party in
connection with any Proceeding within 10 days after the receipt by the Company
of a statement or statements from the Indemnified Party requesting such advance
or advances from time to time, whether prior to or after final disposition of
such Proceeding. Such statement or statements will reasonably evidence the
Expenses incurred by the Indemnified Party and will include or be preceded or
accompanied by an undertaking by or on behalf of the Indemnified Party to repay
any Expenses advanced if it is ultimately determined that the Indemnified Party
is not entitled to be indemnified against such Expenses. Any advances and
undertakings to repay pursuant to this Section 5 will be unsecured and interest
free. Notwithstanding the foregoing, the obligation of the Company to advance
Expenses pursuant to this Section 5 will be subject to the condition that, if,
when and to the extent that the Company determines that the Indemnified Party
would not be permitted to be indemnified under applicable law, the Company will
be entitled to be reimbursed, within 30 days after such determination, by the
Indemnified Party (who hereby agrees to reimburse the Company) for all such
amounts theretofore paid; provided that if the Indemnified Party has commenced
or thereafter commences legal proceedings in a court of competent jurisdiction
to secure a determination that the Indemnified Party should be indemnified under
applicable law, any determination made by the Company that the Indemnified Party
would not be permitted to be indemnified under applicable law will not be
binding and the Indemnified Party will not be required to reimburse the Company
for any advance of Expenses until a final judicial determination is made with
respect thereto (as to which all rights of appeal therefrom have been exhausted
or lapsed).

         Section 6. Indemnification Procedures.

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                  (a) The Indemnified Party agrees promptly to notify the
         Company in writing upon being served with any summons, citation,
         subpoena, complaints, indictment, information or other document
         relating to any Proceeding or matter which may be subject to
         indemnification covered hereunder. The failure of the Indemnified Party
         to so notify the Company will not relieve the Company of any obligation
         which it may have to the Indemnified Party under this Agreement or
         otherwise.

                  (b) The Indemnified Party will be entitled to control the
         defense of any Proceeding with counsel of his own choosing reasonably
         acceptable to the Company, and the Company will cooperate in the
         defense of such Proceeding. If the Indemnified Party determines not to
         control the defense of any Proceeding with counsel of his own choosing,
         the Indemnified Party will promptly so notify the Company in writing
         and the Company will be required to assume the defense of such
         Proceeding using counsel reasonably acceptable to the Indemnified
         Party.

                  (c) The Company will not be liable for any settlement of any
         Proceeding by the Indemnified Party effected without the Company's
         written consent, which consent will not be unreasonably withheld,
         delayed or conditioned by the Company. The Company will not be required
         to obtain the consent of the Indemnified Party to the settlement of any
         Proceeding that the Company has undertaken to defend if the Company
         assumes full and sole responsibility for such settlement and the
         settlement grants the Indemnified Party a complete and unqualified
         release with respect to all potential liability.

                  (d) To obtain indemnification, the advancement of Expenses or
         contribution by the Company under this Agreement, the Indemnified Party
         must submit to the Company a written request, including therewith such
         documentation and information as is reasonably available to the
         Indemnified Party and is reasonably necessary to determine whether and
         to what extent the Indemnified Party is entitled to indemnification.
         The Corporate Secretary of the Company will, promptly upon receipt of
         such a request for indemnification, advise the Board of Directors in
         writing that the Indemnified Party has requested indemnification.

                  (e) Upon written request by the Indemnified Party for
         indemnification, a determination, if required by applicable law, with
         respect to the Indemnified Party's entitlement thereto will be made in
         the specific case (i) if a Change in Control has not occurred since the
         date of this Agreement, (A) by the Board of Directors by a majority
         vote of the Disinterested Directors, (B) if a quorum of the Board of
         Directors consisting of Disinterested Directors is not obtainable or,
         if obtainable, if the majority of the Disinterested Directors so
         direct, by Independent Counsel in a written opinion to the Board of
         Directors, a copy of which will be delivered to the Indemnified Party,
         or (C) if so directed by a majority of the Disinterested Directors, by
         the stockholders of the Company or (ii) if a Change in Control has
         occurred since the date of this Agreement, by Independent Counsel in a
         written opinion to the Board of Directors, a copy of which will be
         delivered to the Indemnified Party (unless the Indemnified Party
         requests that such

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         determination be made by the Board of Directors or the stockholders, in
         which case the determination will be made in the manner provided in
         clause (i) above). The Indemnified Party will cooperate with the person
         or entity making such determination with respect to the Indemnified
         Party's entitlement to indemnification, including providing to such
         person or entity upon reasonable request with any documentation or
         information that is not privileged or otherwise protected from
         disclosure and that is reasonably available to the Indemnified Party
         and reasonably necessary to such determination. Any Independent
         Counsel, member of the Board of Directors, or stockholder of the
         Company will act reasonably and in good faith in making a determination
         under the Agreement of the Indemnified Party's entitlement to
         indemnification. Any costs or expenses (including attorneys' fees and
         disbursements) incurred by the Indemnified Party in so cooperating with
         the person or entity making such determination will be borne by the
         Company (irrespective of the determination as to the Indemnified
         Party's entitlement to indemnification) and the Company hereby agrees
         to indemnify and hold the Indemnified Party harmless therefrom.

                  (f) If the determination of entitlement to indemnification is
         to be made by Independent Counsel, the Independent Counsel will be
         selected as provided in this Section 6(f). If a Change in Control has
         not occurred since the date of this Agreement, the Independent Counsel
         will be selected by the Company's Board of Directors, and the Company
         will give written notice to the Indemnified Party advising him of the
         identity of the Independent Counsel so selected. If a Change in Control
         has occurred since the date of this Agreement, the Independent Counsel
         will be selected by the Indemnified Party and the Indemnified Party
         will give written notice to the Company advising it of the identity of
         the Independent Counsel so selected. In either event, the Indemnified
         Party or the Company, as the case may be, may, within 10 days after
         such written notice of selection will have been given, deliver to the
         other party a written objection to such selection; provided that such
         objection may be asserted only on the ground that the Independent
         Counsel so selected does not meet the requirements of "Independent
         Counsel" as defined in Section 1, and the objection will set forth with
         particularity the factual basis of such assertion. Absent a proper and
         timely objection, the person so selected will act as Independent
         Counsel. If a written objection is made and substantiated, the
         Independent Counsel selected may not serve as Independent Counsel
         unless and until such objection is withdrawn or a court has determined
         that such objection is without merit. If, within 20 days after
         submission by the Indemnified Party of a written request for
         indemnification pursuant to Section 6(d), no Independent Counsel has
         been selected and not objected to, either the Company or the
         Indemnified Party may petition any court of competent jurisdiction for
         resolution of any objection which may have been made by the Company or
         the Indemnified Party to the other party's selection of Independent
         Counsel or for the appointment as Independent Counsel of a person
         selected by the court or by such other person as the court will
         designate, and the person with respect to whom all objections are so
         resolved or the person so appointed will act as Independent Counsel
         under Section 6(e). The Company will pay any and all reasonable fees
         and expenses of Independent Counsel incurred by such Independent
         Counsel in connection with acting pursuant to Section 6(e), and the
         Company will pay all reasonable

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         fees and expenses incident to the procedures of this Section 6(f),
         regardless of the manner in which such Independent Counsel was selected
         or appointed. Upon the commencement of any judicial proceeding or
         arbitration pursuant to this Agreement, Independent Counsel will be
         discharged and relieved of any further responsibility in such capacity
         (subject to the applicable standards of professional conduct then
         prevailing).

                  (g) If it is determined that the Indemnified Party is entitled
         to indemnification, payment to the Indemnified Party will be made
         within 10 days after such determination.

         Section 7. Assumptions and Effect of Certain Proceedings.

                  (a) In making a determination with respect to entitlement to
         indemnification under this Agreement, the person or entity making such
         determination will presume that the Indemnified Party is entitled to
         indemnification under this Agreement if the Indemnified Party has
         submitted a request for indemnification in accordance with Section 6(d)
         and the Company will have the burden of proof to overcome that
         presumption in connection with the making by any person or entity of
         any determination contrary to that presumption.

                  (b) If the person or entity empowered or selected under
         Section 6 to determine whether the Indemnified Party is entitled to
         indemnification has not made a determination within 30 days after
         receipt by the Company of the request therefor, the requisite
         determination of entitlement to indemnification will be deemed to have
         been made and the Indemnified Party will be entitled to such
         indemnification, absent (i) a misstatement by the Indemnified Party of
         a material fact, or an omission of a material fact necessary to make
         the Indemnified Party's statement not materially misleading, in
         connection with the request for indemnification or (ii) a prohibition
         of such indemnification under applicable law. Notwithstanding the
         foregoing, the provisions of this Section 7(b) will not apply if (i)
         the determination of entitlement to indemnification is to be made by
         the stockholders pursuant to Section 6(e) and if (A) within 15 days
         after receipt by the Company of the request for such determination the
         Board of Directors or the Disinterested Directors, if appropriate,
         resolve to submit such determination to the stockholders for their
         consideration at an annual meeting thereof to be held within 75 days
         after such receipt and such determination is made thereat, or (B) a
         special meeting of stockholders is called within 15 days after such
         receipt for the purpose of making such determination, such meeting is
         held for such purpose within 60 days after having been so called and
         such determination is made thereat, or (ii) the determination of
         entitlement to indemnification is to be made by Independent Counsel
         pursuant to Section 6(e).

                  (c) The termination of any Proceeding or of any claim, issue
         or matter therein, by judgment, order, settlement (with or without
         court approval), conviction, or upon a plea of nolo contendere or its
         equivalent, will not (except as otherwise expressly provided in this
         Agreement) of itself adversely affect the right of the Indemnified
         Party to indemnification or create a presumption that the Indemnified
         Party did not act in good faith and in a manner which he reasonably
         believed to be in or not opposed to the best

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         interests of the Company or, with respect to any criminal Proceeding,
         that the Indemnified Party had reasonable cause to believe that his
         conduct was unlawful.

                  (d) For purposes of any determination of good faith, the
         Indemnified Party will be deemed to have acted in good faith if the
         Indemnified Party's action is based on the records or books of account
         of the Company, including financial statements, or on information
         supplied to the Indemnified Party by the directors, officers or
         employees of the Company in the course of their duties, or on the
         advice of legal counsel for the Company or on information or records
         given or reports made to the Company by an independent certified public
         accountant or by an appraiser or other expert selected with reasonable
         care by the Company. In addition, the knowledge or actions, or failure
         to act, of any director, officer, agent or employee of the Company will
         not be imputed to the Indemnified Party for purposes of determining the
         right to indemnification under this Agreement. The provisions of this
         Section 7(d) will not be deemed to be exclusive or to limit in any way
         the other circumstances in which the Indemnified Party may be deemed to
         have met the applicable standards of conduct set forth in this
         Agreement.

         Section 8. Remedies of Indemnified Party.

                  (a) In the event that (i) a determination is made pursuant to
         Section 6 that the Indemnified Party is not entitled to indemnification
         under this Agreement, (ii) advancement of Expenses is not timely made
         pursuant to Section 5, (iii) no determination of entitlement to
         indemnification has been made pursuant to Section 6(e) within 90 days
         after receipt by the Company of the request for indemnification, (iv)
         payment of indemnification is not made pursuant to Section 3 within 10
         days after receipt by the Company of a written request therefor, or (v)
         payment of indemnification is not made within 10 days after a
         determination has been made that the Indemnified Party is entitled to
         indemnification or such determination is deemed to have been made
         pursuant to Section 6 or 7, the Indemnified Party will be entitled to
         an adjudication in an appropriate court of the State of Delaware, or in
         any other court of competent jurisdiction, of his entitlement to such
         indemnification. Alternatively, the Indemnified Party, at his option,
         may seek an award in arbitration to be conducted in Chicago, Illinois
         by a single arbitrator pursuant to the Commercial Arbitration Rules of
         the American Arbitration Association. The Indemnified Party will
         commence such proceeding seeking an adjudication or an award in
         arbitration within 120 days following the date on which the Indemnified
         Party first has the right to commence such proceeding pursuant to this
         Section 8(a). The Company will not oppose the Indemnified Party's right
         to seek any such adjudication or award in arbitration.

                  (b) In the event that a determination has been made pursuant
         to Section 6(e) that the Indemnified Party is not entitled to
         indemnification, any judicial proceeding or arbitration commenced
         pursuant to this Section 8 will be conducted in all respects as a de
         novo trial or arbitration on the merits and the Indemnified Party will
         not be prejudiced by reason of that adverse determination.

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                  (c) If a determination has been made pursuant to Section 6(e)
         that the Indemnified Party is entitled to indemnification, the Company
         will be bound by such determination in any judicial proceeding or
         arbitration commenced pursuant to this Section 8 absent (i) a
         misstatement by the Indemnified Party of a material fact, or an
         omission of a material fact necessary to make the Indemnified Party's
         statement not materially misleading, in connection with the request for
         indemnification or (ii) a prohibition of such indemnification under
         applicable law.

                  (d) In the event that the Indemnified Party, pursuant to this
         Section 8, seeks a judicial adjudication of or an award in arbitration
         to enforce his rights under, or to recover damages for breach of, this
         Agreement, the Indemnified Party will be entitled to recover from the
         Company, and will be indemnified by the Company against, any and all
         Expenses actually and reasonably incurred by him in such judicial
         adjudication or arbitration, but only if he prevails therein. If it is
         determined in such judicial adjudication or arbitration that the
         Indemnified Party is entitled to receive part but not all of the
         indemnification sought, the expenses incurred by the Indemnified Party
         in connection with such judicial adjudication or arbitration will be
         appropriately prorated. The Company will indemnify the Indemnified
         Party against any and all expenses and, if requested by the Indemnified
         Party, will (within 10 days after receipt by the Company of a written
         request therefor) advance such expenses to the Indemnified Party, which
         are incurred by the Indemnified Party in connection with any action
         brought by the Indemnified Party to recover under any directors' and
         officers' liability insurance policies maintained by the Company,
         regardless of whether the Indemnified Party ultimately is determined to
         be entitled to such indemnification, advancement of expenses or
         insurance recovery, as the case may be.

                  (e) The Company will be precluded from asserting in any
         judicial proceeding or arbitration commenced pursuant to this Section 8
         that the procedures and presumptions of this Agreement are not valid,
         binding and enforceable and will stipulate in any such court or before
         any such arbitrator that the Company is bound by all the provisions of
         this Agreement.

         Section 9. Agreements Relating to Change in Control.

                  (a) For a period of six years after the date of any Change in
         Control, the Company will cause to be maintained in effect the policies
         of directors and officers liability insurance and fiduciary liability
         insurance currently maintained by the Company with respect to claims
         arising from or relating to actions or omissions, or alleged actions or
         omissions, occurring on or prior to the date of the Change in Control.
         The Company may at its discretion substitute for such policies
         currently maintained by the Company directors and officers liability
         insurance and fiduciary liability insurance policies with reputable and
         financially sound carriers providing for no less favorable coverage.
         Notwithstanding the provisions of this Section 9(a), the Company will
         not be obligated to make annual premium payments with respect to such
         policies of insurance to the extent such premiums exceed 300 percent of
         the annual premiums paid by the Company as of

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         the date of this Agreement. If the annual premium costs necessary to
         maintain such insurance coverage exceed the foregoing amount, the
         Company will maintain the most advantageous policies of directors and
         officers liability insurance and fiduciary liability insurance
         obtainable for an annual premium equal to the foregoing amount.

                  (b) For a period of six years after the date of any Change in
         Control, the Company will maintain in effect such provisions in its
         Certificate of Incorporation providing for exculpation of director and
         officer liability and indemnification to the fullest extent permitted
         from time to time under the law of the State of Delaware, which
         provisions will not be amended, except as required by applicable law or
         except to make changes permitted by applicable law that would enlarge
         the scope of the Indemnified Party's indemnification rights thereunder.
         The foregoing will not be deemed to restrict the right of the Company
         to modify the provisions of its Certificate of Incorporation relating
         to exculpation of director and officer liability or indemnification
         with respect to events or occurrences after the date of the Change in
         Control so long as such modifications do not adversely affect the
         rights of the Indemnified Party.

         Section 10. Non-Exclusivity.

                  (a) The rights of indemnification as provided by this
         Agreement will not be deemed exclusive of any other rights to which the
         Indemnified Party may at any time be entitled under applicable law, the
         Certificate of Incorporation of the Company, any agreement, any vote of
         stockholders or a resolution of directors, or otherwise. No amendment,
         alteration or repeal of this Agreement or of any provision hereof will
         limit or restrict any right of the Indemnified Party under this
         Agreement in respect of any action taken or omitted by such the
         Indemnified Party prior to such amendment, alteration or repeal. To the
         extent that a change in the Delaware Law, whether by statute or
         judicial decision, permits greater indemnification than would be
         afforded currently under the Company's Certificate of Incorporation and
         this Agreement, it is the intent of the parties hereto that the
         Indemnified Party will enjoy by this Agreement the greater benefits so
         afforded by such change. No right or remedy herein conferred is
         intended to be exclusive of any other right or remedy, and every other
         right and remedy will be cumulative and in addition to every other
         right and remedy given hereunder or now or hereafter existing at law or
         in equity or otherwise. The assertion or employment of any right or
         remedy hereunder, or otherwise, will not prevent the concurrent or
         subsequent assertion or employment of any other right or remedy.

                  (b) To the extent that the Company maintains an insurance
         policy or policies providing liability insurance for directors,
         officers, employees, agents or fiduciaries of the Company or of any
         other corporation, partnership, joint venture, trust, employee benefit
         plan or other enterprise which such person serves at the request of the
         Company, the Indemnified Party will be covered by such policy or
         policies in accordance with its or their terms to the maximum extent of
         the coverage available for any such director, officer, employee, agent
         or fiduciary under such policy or policies.

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                  (c) In the event of any payment under this Agreement, the
         Company will be subrogated to the extent of such payment to all of the
         rights of recovery of the Indemnified Party, who will execute all
         papers required and take all action necessary to secure such rights,
         including execution of such documents as are necessary to enable the
         Company to bring suit to enforce such rights.

                  (d) The Company will not be liable under this Agreement to
         make any payment of amounts otherwise indemnifiable hereunder if and to
         the extent that the Indemnified Party has otherwise actually received
         such payment under any insurance policy, contract, agreement or
         otherwise.

         Section 11. Duration of Agreement. All agreements and obligations of
the Company contained in this Agreement will continue during the period the
Indemnified Party is a director, officer, employee or agent of the Company or is
serving at the request of the Company as a director, officer, employee, agent or
fiduciary of another corporation, partnership, joint venture, trust or other
enterprise and will continue thereafter so long as the Indemnified Party may be
subject to any Proceeding (or any proceeding commenced under Section 8), whether
or not he is acting or serving in any such capacity at the time any liability or
Expense is incurred for which indemnification may be sought under this
Agreement. This Agreement will be binding upon and inure to the benefit of and
be enforceable by the parties hereto and their respective successors (including
any direct or indirect successor by purchase, merger, consolidation or otherwise
to all or substantially all of the business or assets of the Company), assigns,
spouses, heirs, executors and personal and legal representatives.

         Section 12. Security. To the extent requested by the Indemnified Party
and approved by the Company's Board of Directors, the Company may at any time
and from time to time provide security to the Indemnified Party for the
Company's obligations hereunder through an irrevocable blank line of credit,
funded trust or other collateral. Any such security, once provided to the
Indemnified Party, may not be revoked or released without the prior written
consent of the Indemnified Party.

         Section 13. Miscellaneous.

                  (a) No agreement modifying or amending this Agreement or
         extending or waiving any provision of this Agreement will be valid or
         binding unless it is in writing and is executed and delivered by or on
         behalf of the party against which it is sought to be enforced.

                  (b) Whenever possible, each provision of this Agreement will
         be interpreted in such manner as to be effective and valid under
         applicable law, but if any provision of this Agreement is held to be
         prohibited by or invalid under applicable law, such provision will be
         ineffective only to the extent of such prohibition or invalidity,
         without invalidating the remainder of this Agreement.

<PAGE>   12

                  (c) This Agreement may be executed simultaneously in two or
         more counterparts, any one of which need not contain the signatures of
         more than one party, but all such counterparts taken together will
         constitute one and the same Agreement.

                  (d) The descriptive headings of this Agreement are inserted
         for convenience only and do not constitute a part of this Agreement.

                  (e) All notices, demands or other communications to be given
         or delivered under or by reason of the provisions of this Agreement
         will be in writing and will be deemed to have been given when delivered
         personally to the recipient or when sent to the recipient by telecopy
         (receipt confirmed), one business day after the date when sent to the
         recipient by reputable express courier service (charges prepaid) or
         three business days after the date when mailed to the recipient by
         certified or registered mail, return receipt requested and postage
         prepaid. Such notices, demands and other communications will be sent to
         the Company and the Indemnified Party at the addresses indicated below:

<TABLE>
<S>                                                  <C>
                  If to the Company:                 Northfield Laboratories Inc.
                                                     1560 Sherman Avenue
                                                     Suite 1000
                                                     Evanston, Illinois 60201-4422
                                                     Attention: Corporate Secretary

                  If to the Indemnified Party:       c/o Northfield Laboratories Inc.
                                                     1560 Sherman Avenue
                                                     Suite 1000
                                                     Evanston, Illinois 60201-4422
</TABLE>

                  or to such other address or to the attention of such other
         party as the recipient party has specified by prior written notice to
         the sending party.

                  (f) This Agreement constitutes the entire agreement among the
         parties and supersedes any prior understandings, agreements or
         representations by or among the parties, written or oral, that may have
         related in any way to the subject matter hereof.

                  (g) The language used in this Agreement will be deemed to be
         the language chosen by the parties to express their mutual intent and
         no rule of strict construction will be applied against any party. The
         use of the word "including" in this Agreement means "including without
         limitation" and is intended by the parties to be by way of example
         rather than limitation.

                  (h) ALL QUESTIONS CONCERNING THE CONSTRUCTION, VALIDITY AND
         INTERPRETATION OF THIS AGREEMENT AND THE SCHEDULES HERETO WILL BE
         GOVERNED BY THE INTERNAL LAW, AND NOT THE LAW OF CONFLICTS, OF THE
         STATE OF DELAWARE.

<PAGE>   13

                  IN WITNESS WHEREOF, the parties have executed and delivered
this Agreement as of the date first written above.

                                              NORTHFIELD LABORATORIES INC.

                                              By_______________________________

                                              Its______________________________

                                              _________________________________<PAGE>   1
                                                                    EXHIBIT 10.1

                 AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT

         AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT, dated as of April 9,
2001 (this "Agreement"), by and among NORTEL NETWORKS LLC, a limited liability
company organized under the laws of Delaware ("Investor"), NORTEL NETWORKS INC.,
a Delaware corporation ("Parent"), and BROADBAND PARENT CORPORATION, a Delaware
corporation (the "Company").

         WHEREAS, pursuant to an Agreement and Plan of Reorganization dated as
of October 18, 2000, as amended by that First Amendment to Agreement and Plan of
Reorganization dated as of April 9, 2001 (the "Plan of Reorganization"), among
the Company, ANTEC Corporation, Broadband Transition Corporation, Parent, the
Investor and Arris Interactive L.L.C., Investor will receive at the Closing (as
such term is defined in the Plan of Reorganization) shares of Common Stock of
the Company (the "Shares");

         WHEREAS, as an inducement to the Company and ANTEC Corporation to enter
into the Plan of Reorganization, Investor and Parent have agreed to enter into
this Agreement to provide for certain agreements and obligations of the parties
following the Closing;

         NOW, THEREFORE, in consideration of the premises and the mutual
representations, warranties, covenants and agreements contained herein, the
parties hereto hereby agree as follows:

                                    SECTION 1

                                   DEFINITIONS

         Section 1.1. Section 1.1. Definitions. As used in this Agreement, the
following terms shall have the meanings set forth below:

                  "Affiliate" of a Person has the meaning set forth in Rule
12b-2 under the Exchange Act.

                  "Agreement" has the meaning set forth in the preamble hereto.

                  "Associate" of a Person has the meaning set forth in Rule
12b-2 under the Exchange Act.

                  "Auction" shall mean an auction of at least 90% of the
outstanding Voting Securities of the Company, through stock sale, merger or
comparable transaction, or sale of all of substantially all of the assets of the
Company, conducted, in any such instance, by a nationally recognized investment
banking firm selected by the Company and reasonably acceptable to the Investor.
An "Auction" may include either (i) a broad or narrow solicitation of interest
and may or may not involve multiple rounds of bidding as determined by the Board
or a committee

<PAGE>   2
thereof or (ii) any recapitalization, combination, merger, reverse merger,
forward triangular merger, reverse triangular merger, asset sale or similar
transaction.

                  "Beneficially Own" with respect to any securities means having
"beneficial ownership" of such securities (as determined pursuant to Rule 13d-3
under the Exchange Act without limitation by the 60-day provision in paragraph
(d)(1)(i) thereof). The terms "Beneficial Ownership" and "Beneficial Owner" have
correlative meanings.

                  "Board" or "Board of Directors" means the Board of Directors
of the Company.

                  "Business Day" means any day, other than a Saturday, Sunday or
a day on which banking institutions in the State of Delaware are authorized or
obligated by law or executive order to close.

                  "Certificate of Incorporation" means the Certificate of
Incorporation of the Company, as amended from time to time.

                  "Change in Control" means the occurrence of any of the
following events:

                           (a)      the direct or indirect purchase or
acquisition by any Person or 13D Group (other than an Excluded Person) of
Beneficial Ownership of Voting Securities of the Company if, after giving effect
to such acquisition, such Person or 13D Group would Beneficially Own Voting
Securities representing a Voting Ownership Percentage of 20% or more; or

                           (a)      the consummation by the Company or any of
its Subsidiaries of a merger, consolidation or other business combination
(including a sale of all or substantially all of the assets of the Company
(other than to wholly-owned Subsidiaries of the Company)), whether or not
stockholder approval is required, if immediately after giving effect to such
transaction, the Persons who Beneficially Owned Voting Securities immediately
prior to such transaction Beneficially Own in the aggregate Voting Securities
(or voting securities in the case of a surviving entity other than the Company)
representing a Voting Ownership Percentage (or voting power in the case of a
surviving entity other than the Company) of less than 50% immediately after
giving effect to such transaction; or

                           (b)      the consummation by the Company of a plan of
complete liquidation or dissolution of the Company.

                  "Change in Control Transaction" means a transaction which, if
consummated, would result in a Change in Control.

                  "Closing" means the closing of the transactions contemplated
by the Plan of Reorganization.

                  "Closing Date" means the date of the Closing.

                  "Commission" means the Securities and Exchange Commission or
any successor federal agency.

                                       2
<PAGE>   3
                  "Common Stock" means the Common Stock, par value $0.01 per
share, of the Company.

                  "Company" has the meaning set forth in the preamble hereto.

                  "Confidentiality Agreement" has the meaning set forth in
Section 4.1(a) hereof.

                  "Control" with respect to any Person means the possession,
direct or indirect, of the power to direct or cause the direction of the
management and policies of such Person, whether through the ownership of voting
securities or board membership, by contract or otherwise.

                  "Derivative Securities" means any subscriptions, options,
conversion rights, warrants, phantom stock rights or other agreements,
securities or commitments of any kind obligating the Company or any of its
Subsidiaries to issue, grant, deliver or sell, or cause to be issued, granted,
delivered or sold (i) any Voting Securities of the Company, (ii) any securities
convertible into, exercisable for or exchangeable for any Voting Securities of
the Company, or (iii) any obligations measured by the price or value of any
shares of capital stock of the Company.

                  "Director" shall mean a director of the Company.

                  "Disposition" has the meaning set forth in Section 3.3 hereof.

                  "Exchange Act" means the Securities Exchange Act of 1934, as
amended, or any successor federal statute, and the rules and regulations
promulgated from time to time thereunder.

                  "Excluded Person" means (i) any member of the Investor Group,
(ii) any wholly-owned subsidiary of the Company or (iii) any underwriter
temporarily holding Voting Securities in connection with a public offering of
such securities.

                  "GAAP" means United States generally accepted accounting
principles.

                  "Governmental Entity" means any government or any agency,
bureau, board, commission, court, department, political subdivision, tribunal,
or other instrumentality of any government (including any regulatory or
administrative agency), whether federal, state or local, domestic or foreign.

                  "Independent Director" means a person who (apart from such
directorship) (i) is not a current officer or employee of the Company or any
Affiliate of the Company, (ii) is not a current director, officer or employee of
the Investor, Parent or any member of the Investor Group, (iii) has not been in
the past three years an officer, employee, stockholder holding more than 10% of
the voting interest of, partner or Affiliate of the Company, the Investor,
Parent, or the Investor Group.

                  "Initial Investor Nominee Notice" has the meaning set forth in
Section 2.1(a) hereof.

                                       3
<PAGE>   4

                  "Investor" has the meaning set forth in the preamble hereto.

                  "Investor Group" shall mean (a) the Investor, (b) Parent, (c)
any Subsidiary of the Investor or Parent, (d) any Affiliate of the Investor or
Parent, and (e) any Person with whom the Investor, Parent or any Person included
in the foregoing clauses (c) or (d) is part of a 13D Group.

                  "Investor Nominee Notice" has the meaning set forth in Section
2.1(a) hereof.

                  "Investor Nominee" has the meaning set forth in Section 2.1(a)
hereof; provided, however, that John (Ian) Anderson Craig shall not be deemed an
Investor Nominee unless expressly agreed to in writing by the Investor.

                  "Law" means any law, treaty, statute, ordinance, code, rule or
regulation of a Governmental Entity.

                  "Market Price," shall mean on any trading day, with respect to
shares of Common Stock or any other security which is listed on a national
securities exchange, the last sale price regular way, or, in case no such sale
takes place on such day, the average of the closing bid and asked prices regular
way, in either case on the principal national securities exchange on which the
Common Stock or other security is listed or admitted to trading, or, if the
Common Stock or other security is not listed or admitted to trading on any
national securities exchange but is designated as a national market system
security by the NASD, the last sale price, or, in case no such sale takes place
on such day, the average of the closing bid and asked prices, in either case as
report on the NASD Automated Quotation/National Market System, or if the Common
Stock or other security is not so designated as a national market system
security, the average of the highest reported bid and lowest reported asked
prices as furnished by the NASD or similar organization if the NASD is no longer
reporting such information.

                  "NASD" means the National Association of Securities Dealers,
Inc., or any successor organization.

                  "Ownership Cap" means a Voting Ownership Percentage of greater
than 49.9%.

                  "Parent" has the meaning set forth in the preamble hereto.

                  "Person" means any individual, corporation, company,
association, partnership, joint venture, limited liability company, trust or
unincorporated organization, group (within the meaning of Rule 13d-5 under the
Exchange Act) or a government or any agency or political subdivision thereof.

                  "Plan of Reorganization" has the meaning set forth in the
preamble hereto.

                  "Process" has the meaning set forth in Section 4.2 hereof.

                  "Public Stockholders" means the stockholders of the Company
other than (a) the members of the Investor Group,(b) any Person who has made a
Third-Party Offer, (c) any Affiliate of any Person included in the foregoing
clause (b), and (d) any Person with whom any Person included in the foregoing
clauses (b) or (c) is part of a 13D Group.

                                       4
<PAGE>   5
                  "Purchasing Person" has the meaning set forth in Section
3.3(b)(II) hereof.

                  "Purchaser Standstill Agreement" has the meaning set forth in
Section 3.3(b)(II) hereof.

                  "Qualified Offer" shall mean a written offer by the Investor,
Parent or any member of the Investor Group to acquire at least 90% of the
outstanding Voting Securities of the Company, through stock acquisition, merger
or similar transaction, or all or substantially all of the assets of the
Company.

                  "Registration Rights Agreement" means the Registration Rights
Agreement to be entered into by the Company and the Investor in connection with
the transactions contemplated by the Plan of Reorganization.

                  "Representatives" means, with respect to any Person, any of
such Person's officers, directors, partners, employees, agents, attorneys,
accountants, consultants or financial or other advisors or other Person
associated with or acting on behalf of such Person.

                  "Required Disposition" has the meaning set forth in Section
3.5 hereof.

                  "Required Disposition Amount" has the meaning set forth in
Section 3.5 hereof.

                  "Securities Act" means the Securities Act of 1933, as amended,
or any successor federal statute, and the rules and regulations promulgated from
time to time thereunder.

                  "Sell Down Period" has the meaning set forth in Section 3.5
hereof.

                  "Shares" has the meaning set forth in the preamble hereto.

                  "Standstill Period" means the period commencing on the date
hereof and ending on the termination of this Agreement pursuant to Section 5.

                  "Subsidiary" means, as to any Person, any other Person more
than fifty percent (50%) of the shares of the voting stock or other voting
interests of which are owned or controlled, or the ability to select or elect
more than fifty percent (50%) of the directors or similar managers is held,
directly or indirectly, by such first Person or one or more of its Subsidiaries
or by such first Person and one or more of its Subsidiaries. A Subsidiary that
is directly or indirectly wholly-owned by another Person except for directors'
qualifying shares shall be deemed wholly-owned for purposes of this Agreement.

                  "Third-Party Offer" means a written offer by a Third-Party
Person to acquire some, all or no shares of Common Stock held by members of the
Investor Group and at least 90% of the outstanding shares of Common Stock held
by the Public Stockholders, through stock acquisition, merger or similar
transaction; provided, however, that a majority of the outstanding shares of
Common Stock held by the Public Stockholders must be tendered in connection with
this offer; and provided further, however, that the per share consideration
offered to members of the Investor Group may be below the per share
consideration offered to the Public Stockholders.

                                       5
<PAGE>   6
                  "Third-Party Person" means any Person other than (a) the
Investor, (b) Parent, (c) any Subsidiary of the Investor or Parent, or (d) any
Affiliate of any Person included in the foregoing clauses (a), (b) or (c).

                  "13D Group" shall mean any group of Persons who, with respect
to those acquiring, holding, voting or disposing of Voting Securities would,
assuming ownership of the requisite percentage thereof, be required under
Section 13(d) of the Exchange Act to file a statement on Schedule 13D with the
Commission as a "person" within the meaning of Section 13(d)(3) of the Exchange
Act, or who would be considered a "person" for purposes of Section 13(g)(3) of
the Exchange Act.

                  "Total Voting Power" shall mean, calculated at a particular
point in time, the aggregate Votes represented by all then outstanding Voting
Securities then entitled to vote.

                  "Ultimate Parent Entity" has the meaning set forth in Section
3.1.

                  "Votes" shall mean, at any time, with respect to any Voting
Securities, the total number of votes that would be entitled to be cast by the
holders of such Voting Securities generally (by the terms of such Voting
Securities, the Certificate of Incorporation or any certificate of designations
for such Voting Securities) in a meeting for the election of Directors held at
such time.

                  "Voting Ownership Percentage" shall mean, calculated at a
particular point in time, the Voting Power represented by the Voting Securities
Beneficially Owned by the Person whose Voting Ownership Percentage is being
determined.

                  "Voting Power" shall mean, calculated at a particular point in
time, the ratio, expressed as a percentage, of (a) the Votes represented by the
Voting Securities then entitled to vote with respect to which the Voting Power
is being determined to (b) Total Voting Power.

                  "Voting Securities" means the shares of Common Stock and any
other securities of the Company entitled to vote generally for the election of
directors, and any securities which are convertible into, or exercisable or
exchangeable for, Voting Securities.

         Section 1.2. General Interpretive Principles. Whenever used in this
Agreement, except as otherwise expressly provided or unless the context
otherwise requires, any noun or pronoun shall be deemed to include the plural as
well as the singular and to cover all genders. The name assigned this Agreement
and the section captions used herein are for convenience of reference only and
shall not be construed to affect the meaning, construction or effect hereof.
Unless otherwise specified, the terms "hereof," "herein" and similar terms refer
to this Agreement as a whole (including the exhibits, schedules and disclosure
statements hereto), and references herein to Sections refer to Sections of this
Agreement.

                                       6
<PAGE>   7

                                    SECTION 2

                                   GOVERNANCE

         Section 2.1. Directors Designated by the Investor. (a) Immediately
following the Closing, the Board shall appoint as additional Directors the two
(2) Investor Nominees (as defined in Section 2.1(b) below) who have been
designated by the Investor in the Investor Nominee Notice (as defined in Section
2.1(b) below, the "Initial Investor Nominee Notice"). In the event of a vacancy
caused by the removal, resignation or other cessation of service of any Investor
Nominee from the Board, the Board shall promptly notify the Investor of any such
removal, resignation or other cessation of service and shall elect as a Director
(to serve until the Company's immediately succeeding annual meeting of
stockholders) a new Investor Nominee who has been designated by the Investor in
an additional Investor Nominee Notice that has been provided to the Company at
least six (6) days prior the date of a regular meeting of the Board. The
Investor shall nominate each Investor Nominee pursuant to an additional Investor
Nominee Notice in advance of each meeting of stockholders at which such Investor
Nominee is to be elected.

                  (b)      The Investor shall provide notice to the Company (the
"Investor Nominee Notice") as required by Section 2.1(a) above for each Investor
Nominee, which notice shall contain the name of the person(s) it has designated
to become Director(s) (the "Investor Nominees"). In addition, upon request by
the Company, the Investor shall provide all information required by Regulation
14A and Schedule 14A under the Exchange Act with respect to each such Investor
Nominee.

                  (c)      The Company agrees, subject to Section 2.2 below, to
include such Investor Nominee to be added to or retained on the Board pursuant
to this Agreement in the slate of nominees recommended by the Board to the
Company's stockholders for election as Directors and shall use its reasonable
efforts to cause the election or reelection of each such Investor Nominee to the
Board at each meeting of stockholders at which such Investor Nominee is up for
election, including soliciting proxies in favor of the election of such persons,
it being understood that efforts consistent with those used for other members of
the slate recommended by the Board shall be deemed reasonable. In the event
that, notwithstanding the provisions of this Section 2.1(c), any one or more
Investor Nominees is not elected to the Board then, at the written request of
the Investor made within thirty (30) days after the date of the stockholder
meeting at which such one or more Investor Nominees were not elected, the
Company shall promptly call a special meeting of the Company's stockholders
(such special meeting to be held on a date not more than 60 days after receipt
of such written request of the Investor) proposing the election of such Investor
Nominees not elected to the Board or alternative Investor Nominees as may be
designated by the Investor in accordance with Section 2.1 and in connection with
such special meeting shall use its reasonable efforts to cause the election of
such Investor Nominees by the stockholders of the Company, including
recommending the election of such Investor Nominees and soliciting proxies in
favor of the election of such Investor Nominees by the stockholders of the
Company. In the event the Investor elects to call a special meeting of
stockholders pursuant to this section, the Company shall, until such time as
each such Investor Nominee being proposed by the Investor is elected to the
Board, invite such Investor Nominee who was not elected to the Board to attend
meetings of the Board as an observer, and the Company shall afford to such
Investor Nominee, on as nearly equivalent basis as is possible (other than the
right to vote) as would have been the case if such Investor Nominee had been
elected to the Board, the opportunity to meaningfully participate in, express
views with respect to and have influence on the deliberations of the Board,
including through receipt, at the same time as the Board receives

                                       7
<PAGE>   8
the same, of all information and material as is distributed to the Board. The
parties hereto agree that the Investor Nominees are not assuming any fiduciary
duty toward the Company or its stockholders by virtue of the grant or exercise
of observer rights to such Investor Nominees, as described in the immediately
preceding sentence. At the direction of the Investor, the Company shall use
reasonable efforts to cause the removal from the Board of Directors of any
Investor Nominee.

                           (d)      Except for any Investor Nominee who is an
Independent Director, the Investor acknowledges that the Investor Nominees to
the Board will not be entitled to receive any compensation as directors.

         Section 2.2. Resignation of Investor Nominees. Unless otherwise agreed
by the Company, (a) subject to clause (b) below, at such time that the Investor
Group's Voting Ownership Percentage falls below 20%, Investor shall be entitled
to only one Investor Nominee on the Board and the Investor shall cause one
Investor Nominee then serving on the Board to offer his or her resignation from
the Board immediately thereafter, and (b) the Investor shall cause all of the
Investor Nominees then serving on the Board to offer their resignations from the
Board immediately at any time after the Investor Group's Voting Ownership
Percentage falls below 10%.

         Section 2.3. Composition of the Board; Independent Directors. From and
after the Closing, the Company shall use its reasonable best efforts to ensure
that not less than 60% of the members of the Board are Independent Directors;
provided, however, that upon the removal, resignation or other cessation of
service of an Independent Director (other than an Independent Director who was
an Investor Nominee, in which case the replacement of such director shall be in
accordance with Section 2.1), the Company and the Board shall have a reasonable
amount of time (not to exceed 60 days after such removal, resignation or other
cessation of service) to replace such director with another Independent
Director.

         Section 2.4. Board Size. From and after the Closing, the Company
agrees that the number of Directors constituting the whole Board shall not
exceed 15 members.

         Section 2.5. Failure to Notify. Notwithstanding anything to the
contrary in this Section 2, if the Investor fails to provide an Investor Nominee
Notice to the Company with respect to any election of Directors, it shall be
deemed that the Investor Nominees then serving as Directors, if any, shall be
the Investor Nominees for reelection.

         Section 2.6. Written Consent. The parties hereto agree that the
provisions of Section 2 shall be deemed to apply to any written consent of
stockholders in lieu of a meeting.

                                    SECTION 3

                              ADDITIONAL AGREEMENTS

         Section 3.1. Standstill Agreement. Subject to Section 3.4 hereof,
during the Standstill Period, and, unless the Company shall have breached its
obligation to nominate Investor Nominees pursuant to Section 2, the Investor and
Parent shall not, and each of them shall cause

                                       8
<PAGE>   9
each other member of the Investor Group not to, directly or indirectly, alone or
in concert with others:

                           (a)      acquire, offer or propose to acquire or
agree to acquire, whether by purchase, tender or exchange offer, through the
acquisition of control of another person, by joining a partnership, limited
partnership, syndicate or other 13D Group or otherwise, Beneficial Ownership of
any Voting Securities, Derivative Securities or any other securities of the
Company or any rights to acquire (whether currently, upon lapse of time,
following the satisfaction of any conditions, upon the occurrence of any event
or any combination of the foregoing) any Voting Securities, other than (i) the
acquisition of the Shares pursuant to the Plan of Reorganization, (ii) the
acquisition of Voting Securities as a result of any stock splits, stock
dividends or other distributions, recapitalizations or offerings made available
by the Company to holders of Voting Securities generally or (iii) in a
transaction in which the Investor or Parent or an Affiliate of the Investor or
Parent acquires a previously unaffiliated business entity that, to the knowledge
of the Investor or Parent after reasonable inquiry (which inquiry shall be
satisfied by the receipt of a written representation to such effect from the
to-be-acquired business entity), owns shares of Voting Securities that represent
less than 5% of the Company's outstanding Voting Securities; provided, that all
such Voting Securities shall be subject to the terms of this Agreement;
provided, further, that in the event a transaction contemplated by clause (iii)
hereof, causes the Investor Group's Voting Ownership Percentage to exceed the
Ownership Cap, the Investor will use reasonable best efforts to transfer, or
cause such Affiliate to transfer, within twelve months following the
consummation of such transaction and in a manner consistent with Section 3.5,
such number of Voting Securities previously owned by the unaffiliated entity, so
as to reduce the Voting Ownership Percentage of the Investor Group to no more
than the Ownership Cap, and the Investor or such Affiliate will cause all such
Voting Securities, pending their transfer, to be voted in accordance with the
requirements of Section 3.2 below;

                           (b)      propose or seek to effect any merger,
business combination, restructuring, recapitalization or similar transaction
involving the Company or any of its Subsidiaries or the sale of all or
substantially all of the assets of the Company or any of its Subsidiaries except
pursuant to Section 4.2 hereof;

                           (c)      deposit any Voting Securities in a voting
trust or subject any Voting Securities to any arrangement or agreement with
respect to the voting of such Voting Securities, unless such voting trust
provides that the Voting Securities will be voted consistent with the provisions
of this Agreement;

                           (d)      except for the exercise by the Investor
Nominees of their fiduciary duties and except pursuant to Section 2 hereof, seek
election to, seek to place a representative on, or seek the removal of any
member of, the Board;

                           (e)      engage in any "solicitation" (within the
meaning of Rule 14a-1 under the Exchange Act) of proxies or consents (whether or
not relating to the election or removal of directors) with respect to the
Company, or become a "participant" in any "election contest" (within the meaning
of the Exchange Act) or, unless the execution by the Investor, Parent or member
of the Investor Group is first approved by the Board, execute any written

                                       9
<PAGE>   10

consent in lieu of a meeting of the holders of any class of Voting Securities
that is solicited by or on behalf of any stockholder of the Company;

                           (f)      call or seek to have called any meeting of
the stockholders of the Company (except for the exercise by the Investor of its
rights pursuant to this Agreement);

                           (g)      unless approved by the Board of Directors,
initiate, propose or otherwise solicit stockholders for the approval of any
stockholder proposal (as described in Rule 14a-8 under the Exchange Act) with
respect to the Company;

                           (h)      form, join or in any way participate in or
assist in the formation of a 13D Group with respect to any Voting Securities,
other than any such "group" consisting exclusively of the Investor, Parent and
other Affiliates of the Investor or Parent who have acquired Voting Securities
in accordance with this Agreement;

                           (i)      disclose or publicly announce any intention,
plan or arrangement inconsistent with the foregoing; or

                           (j)      intentionally finance any other persons in
connection with any of the foregoing types of activities; provided, however,
that nothing in this Section 3.1 shall (i) limit any rights of the members of
the Investor Group under the Registration Rights Agreement, (ii) prohibit any
individual who is serving as a Director of the Company, solely in his or her
capacity as a Director, from (x) exercising his or her fiduciary duties, (y)
taking any action or making any statement at any meeting of the Board of
Directors or of any committee thereof, or (z) making any statement or disclosure
required under federal securities laws or other applicable Law, (iii) restrict
any disclosure or statements required to be made by any member of the Investor
Group under applicable Law to the extent any such requirement does not arise
from actions by the Investor Group inconsistent with this Agreement, (iv) limit
the rights of the Investor Group pursuant to Sections 2, 3.2, 3.4 or 4.2 hereof
or (v) limit the ability of any member of the Investor Group, in its sole
discretion, directly or indirectly, alone or in concert with others, from
participating in discussions or negotiations with a Third-Party Person with
respect to a Third-Party Offer (it being acknowledged and agreed that (A) the
members of the Investor Group can indicate to such Third-Party Person their
preliminary interests or intentions with respect to such Third-Party Offer and
(B) no member of the Investor Group shall be deemed to be in breach of this
Section 3.1 to the extent that a majority of the outstanding shares of Common
Stock held by the Public Stockholders is not tendered in connection with such
Third-Party Offer); provided, however, with respect to clause (v), that such
member of the Investor Group (A) provide the Company with written notice of the
identity of such Third-Party Person as soon as reasonably practicable after
either the Chief Financial Officer of Nortel Networks Corporation (or any
successor thereto) (the "Ultimate Parent Entity") or the senior member of the
Ultimate Parent Entity's Mergers and Acquisitions Group (or any successor
thereto) becomes aware of discussions or negotiations by a member of the
Investor Group relating to a bona fide Third-Party Offer and (B) allow the
Company to participate in such discussions or negotiations.

         Section 3.2. Voting. At all times during the Standstill Period and to
the full extent permitted by Delaware law, the Investor and Parent shall and
shall cause each other member of the Investor Group to vote all Voting
Securities which they Beneficially Own, at any stockholder

                                       10
<PAGE>   11
meeting or in connection with any action by written consent at or in which such
Voting Securities are entitled to vote, in favor of the slate of nominees
(including any Investor Nominee to be included in such slate in accordance with
Section 2) proposed by the Board; provided, that any Investor Nominee nominated
by the Investor for inclusion in such slate pursuant to Section 2.1 is so
included. Notwithstanding the foregoing, any member of the Investor Group, in
its sole discretion, may freely vote any Voting Securities which it Beneficially
Owns on any proposed Change in Control Transaction which requires the approval
of the Company's stockholders generally.

         Section 3.3. Dispositions. During any period of time during the
Standstill Period when the Investor Group shall Beneficially Own Voting
Securities representing at least 10% of the Total Voting Power of the Company,
the Investor and Parent shall not and shall cause each other member of the
Investor Group not to, directly or indirectly (including, without limitation,
through the disposition or transfer of any equity interest in another Person),
sell, assign, transfer, pledge, hypothecate, grant any option with respect to or
otherwise dispose of any interest in (or enter into an agreement or
understanding with respect to the foregoing) any Voting Securities (a
"Disposition"), except as set forth below in this Section 3.3.

                  (a)      Dispositions may be made to Affiliates of the
Investor, Parent or members of the Investor Group; provided, that such
Affiliates agree in writing to be bound by this Agreement to the same extent as
the Investor and Parent and such Affiliates at all times remain Affiliates of
the Investor, Parent or members of the Investor Group.

                  (b)      Dispositions of Voting Securities may be made to
Persons other than members of the Investor Group pursuant to (i) a bona fide
public offering effected in accordance with the Registration Rights Agreement,
(ii) in bona fide open market "brokers' transactions" or transactions directly
with a "market maker" as permitted by the provisions of Rule 144 as currently
promulgated under the Securities Act, and (iii) in privately-negotiated
transactions to (A) any Person specified in Rule 13d-1(b)(1)(ii) promulgated
under the Exchange Act who would be eligible based on such person's status and
passive intent with respect to the ownership, holding and voting of such Voting
Securities to report such person's ownership of such Voting Securities (assuming
such person owned a sufficient number of such Voting Securities to require such
filing) on Schedule 13G or (B) any other Person; provided, however, that:

                           (i)      Dispositions shall not be made pursuant to
clause (iii)(A) of this Section 3.3(b) if any Person to whom the Disposition in
question is made would, to the knowledge of the Investor after reasonable
inquiry (which inquiry shall be satisfied by the receipt of a written
representation to such effect from such Person), after giving effect to such
Disposition, together with such Person's Affiliates and Associates and the
members of any 13D Group existing with respect to Voting Securities of which
such Person is a part Beneficially Own Voting Securities representing more than
10% of the Total Voting Power then outstanding.

                           (ii)     Dispositions shall not be made pursuant to
clause (iii)(B) of this Section 3.3(b) unless the Person purchasing the Voting
Securities, together with such Person's Affiliates and Associates and the
members of any 13D Group existing with respect to Voting Securities of which
such Person is a part (any such Person and its Affiliates, Associates

                                       11
<PAGE>   12
and 13D Group members being collectively referred to herein as a "Purchasing
Person"), shall have executed and delivered to the Company a written agreement
(which agreement shall be addressed to the Company and reasonably satisfactory
in form and substance to the Company) (a "Purchaser Standstill Agreement") of
each such Purchasing Person to be bound by Section 3 of this Agreement to the
same extent as the Investor as if references to the Investor in such Section
were to such Purchasing Person.

                           (iii)    No Disposition shall be made (other than
pursuant to Section 3.3(b)(i)) if such Disposition would constitute a
distribution in violation of Regulation M under the Exchange Act by reason of
any repurchase program of the Company then announced.

                  (c)      Dispositions may be made to the Company in accordance
with Section 3.4 hereof.

                  (d)      Dispositions may be made pursuant to a tender offer,
exchange offer or any other transaction (x) which is recommended to stockholders
of the Company by the Board of Directors (or, in the case of a tender or
exchange offer, which is not within 10 Business Days of the commencement thereof
opposed by the Board of Directors) or (y) in the case of a merger or other
business combination transaction, which has been approved by the stockholders of
the Company (including approval without a meeting pursuant to the short-form
merger provisions of the Delaware General Corporation Law) in a manner so as to
be legally binding on all stockholders of the Company and so as to require the
disposition by such stockholders of their shares pursuant to such merger or
other business combination transaction (without regard to this Agreement).

                  (e)      [Intentionally omitted.]

                  (f)      Dispositions may be made pursuant to a Third-Party
Offer, it being acknowledged and agreed that the Investor Group has sole
discretion with respect to the number of Voting Securities, if any, sold by the
Investor Group in the Third-Party Offer.

                  (g)      If the Investor intends to effect a Disposition in
accordance with Section 3.3(b)(iii), it shall give the Company as much prior
notice of such intention as is reasonably practicable, but in any event at least
three (3) days prior to the closing of such Disposition.

         Section 3.4. Qualified Offer. Notwithstanding anything to the contrary
contained in Section 3.1, the Investor, Parent or any member of the Investor
Group may make a Qualified Offer in accordance with the following procedure:

                  (a)      In connection with any Qualified Offer, the Investor
shall deliver the Qualified Offer in writing to the Company. In the event that
the Company does not accept such Qualified Offer in writing within thirty (30)
days after receipt, such offer shall be deemed withdrawn and the Company shall
promptly commence an Auction in which the Investor, Parent and the Investor
Group will be given a full and fair opportunity, as conclusively determined by
the Board in good faith, to participate on terms, and to have any bid submitted
by the Investor, Parent or any member of the Investor Group in such Auction
evaluated on a basis, no less and no more favorable to the Investor than those
afforded to other Auction participants.

                                       12
<PAGE>   13

                  (b)      Any Auction shall be subject to the following
provisions:

                           (i)      The Auction shall be completed within 90
days after the Company receives the Qualified Offer and the corresponding sale
shall close within 90 days after completion of the Auction.

                           (ii)     In the event that (A) the Investor Group is
not the successful bidder in an Auction conducted pursuant to Section 3.4(a) or
does not elect to participate in the Auction, and (B) the Company has received a
fairness opinion from a nationally-recognized investment banking firm, which is
selected by the Company and reasonably acceptable to the Investor, to the effect
that the successful bidder's transaction provides the Company or its
stockholders, as the case may be, with the highest value of all of the bids
received in the Auction, then the Investor and Parent shall, and each of them
shall cause the Investor Group to, vote all of their Voting Securities in favor
of the successful bidder's transaction (provided that this agreement to vote in
favor of such transaction does not waive any other rights that any member of the
Investor Group may have under Delaware law, other than dissenter's rights),
tender their shares (in the event of a tender or exchange offer), and otherwise
reasonably cooperate in consummating the transaction.

                           (iii)    The Company, the Investor and Parent agree
that the purchase price per share set forth in the Qualified Offer is highly
confidential and, as such, the Company on the one hand and the Investor, Parent
and the Investor Group, on the other, shall not, to the extent legally
permissible, disclose such purchase price per share to any third party without
the prior written consent of the other party.

                  (c)      To the extent that the consideration in a Qualified
Offer or in any competing bid in an Auction is securities, the value of any
securities offered shall equal the average Market Price per share or per unit of
such securities during the 30 consecutive trading days immediately preceding the
Company's receipt of the Qualified Offer or the receipt of the bid by the
Company, respectively. In the case of any securities not theretofore traded, the
value of such securities shall be determined by a nationally recognized
investment banking firm selected by the Company and reasonably acceptable to the
Investor. The Investor and the Company shall use their reasonable best efforts
to cause any such determination of value to be made within five (5) business
days following the Company's receipt of a Qualified Offer or a bid, as the case
may be.

         Section 3.5. Required Dispositions. If, at any time during the
Standstill Period, the Voting Ownership Percentage of the Investor Group shall
exceed the Ownership Cap, solely as a result of any transactions contemplated by
Section 3.1(a)(iii) then, if and to the extent requested by the Company by
written notice to the Investor which may be made at any time, the Investor
shall, within twelve months after such request (the "Sell Down Period"), dispose
of, or cause the other members of the Investor Group to dispose of (a "Required
Disposition"), such number of Voting Securities owned by the Investor Group as
shall be necessary to reduce the Voting Ownership Percentage of the Investor
Group to no more than the Ownership Cap (the "Required Disposition Amount");
provided that any such Required Disposition shall be subject to the provisions
of Section 3.3 and provided, further, that the Investor agrees that such Voting
Securities in excess of the Ownership Cap shall be voted by the Investor Group
at any meeting of

                                       13
<PAGE>   14
stockholders (or action by written consent in lieu of any such meeting) in
accordance with Section 2. Notwithstanding the foregoing, if any Required
Disposition during the applicable Sell Down Period (A) would result in liability
or potential liability to the Investor or other members of the Investor Group
under Section 16(b) of the Exchange Act, or the rules and regulations
promulgated thereunder, or (B) would be prohibited as a result of the
restrictions set forth in the Registration Rights Agreement on transfer of
Voting Securities, then such Sell Down Period (x) shall, in the case of clause
(A) above, begin on the first date on which such Required Disposition may be
effected without liability or potential liability under Section 16(b) of the
Exchange Act, or the rules and regulations promulgated thereunder, and (y) with
respect to clause (B) above, be extended by the number of days that the Investor
Group is restricted from selling Voting Securities under the Registration Rights
Agreement.

                                    SECTION 4

                              ADDITIONAL COVENANTS

         Section 4.1. Certain Information. (a) Subject to applicable law and the
provisions of this Agreement, all information provided to the Investor or the
Company hereunder shall be provided in confidence in accordance with the
provisions of the Confidentiality Agreement (the "Confidentiality Agreement"),
dated May 9, 2000, between ANTEC Corporation and Parent.

                           (b)      To the extent reasonably requested by the
Investor, the Company will and will cause its Representatives to provide
information regarding the Company and its Subsidiaries, and otherwise cooperate
with, the Investor so as to enable the Investor to prepare financial statements
in accordance with GAAP and to comply with its disclosure requirements under
securities laws and regulations. The costs associated with providing the
foregoing information shall be borne by the Investor.

                           (c)      From time to time upon reasonable advance
request by the Company, the Investor will notify the Company of the amount of
each class of Voting Securities then Beneficially Owned by the Investor Group.
From time to time upon reasonable advance request by the Investor, the Company
will provide the Investor with information known to the Company with respect to
the number of votes entitled to be voted by stockholders of the Company at the
time of such request; provided, however, that the Company shall not be obligated
pursuant to this Section 4.1(c) to make any general solicitation of stockholders
of the Company in connection therewith.

         Section 4.2. Right to Participate in Sale of the Company. So long as
the Investor Group shall Beneficially Own Voting Securities representing at
least 20% of the Total Voting Power of the Company, the Company shall not enter
into, and the Board shall not publicly recommend to stockholders or approve, a
definitive agreement providing for a Change in Control Transaction, unless prior
thereto (i) the Investor shall have been given at least 30 days prior notice of
the proposed Change in Control Transaction and of the material terms thereof and
the Investor (or any other member of the Investor Group or Third-Party Person
designated by the Investor) shall have been given a full and fair opportunity,
as conclusively determined by the Board in good faith, to participate in the
bidding process (the "Process") undertaken by the Company (if any) in advance of
such Change in Control Transaction on terms, and to have any

                                       14
<PAGE>   15
proposal submitted by the Investor (or such other member of the Investor Group
or Third-Party Person) pursuant to clause (ii) below evaluated on a basis, no
less and no more favorable to the Investor (or such other member of the Investor
Group or Third-Party Person) than those afforded to other interested parties,
(ii) the Investor (or such other member of the Investor Group or Third-Party
Person) shall have been permitted notwithstanding the restrictions contained in
Section 3.1, to submit a proposal for an alternative transaction during the
Interim Period (as defined below) or in connection with such Process, subject in
any event to the Board's right to accept or reject any such proposal as may be
made, (iii) the Interim Period shall have terminated or (iv) the Change in
Control Transaction resulted from an Auction conducted in accordance with
Section 3.4. "Interim Period" shall mean the period commencing on the date of
the delivery to the Investor by the Company of written notice (such notice, the
"Change in Control Transaction Notice") of its consideration of an action in
respect of a Change in Control Transaction and ending on the date which is the
later of (i) the 30th day thereafter, and (ii) the public announcement by the
Company of the taking of any action in respect of a Change in Control
Transaction.

         Section 4.3. Publicity. Except as required by Law or by obligations
pursuant to any listing agreement with any relevant securities exchange, neither
the Company or any of its Affiliates nor the Investor, Parent or any of their
Affiliates shall, without the prior written consent of the other, which consent
shall not be unreasonably withheld or delayed, make any public announcement or
issue any press release with respect to the transactions contemplated by this
Agreement. Prior to making any public disclosure required by applicable Law or
pursuant to any listing agreement with any relevant national exchange, the
disclosing party shall consult with the other party, to the extent feasible, as
to the content of such public announcement or press release. Notwithstanding the
foregoing, the Investor, Parent and the Company may, in meetings with securities
and other financial analysts and press interviews, disclose information (other
than non-public information) concerning the transactions contemplated hereby and
the Investor's and Parents' investment in the Company and in a manner not
inconsistent with prior joint public announcements regarding the transactions
and in a manner consistent with the other terms of this Agreement.

         Section 4.4. Legend. The Investor agrees to the placement on
certificates representing the Shares of a legend substantially as set forth
below, unless the Company determines otherwise, in accordance with the opinion
of counsel:

         "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
         REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933 (THE "SECURITIES
         ACT"), OR THE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR
         NON-U.S. JURISDICTION AND MAY NOT BE OFFERED, SOLD, TRANSFERRED OR
         OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION
         STATEMENT OR PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT
         SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND ANY
         APPLICABLE SECURITIES LAWS OF SUCH OTHER JURISDICTIONS. THE SECURITIES
         REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO THE PROVISIONS
         (INCLUDING PROVISIONS THAT RESTRICT THE TRANSFER OF SUCH SECURITIES) OF
         AN AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT

                                       15
<PAGE>   16
         DATED AS OF APRIL 9, 2001 AMONG THE COMPANY, NORTEL NETWORKS LLC AND
         NORTEL NETWORKS INC., COPIES OF WHICH ARE ON FILE AT THE OFFICES OF THE
         SECRETARY OF THE COMPANY."

                                    SECTION 5

                                   TERMINATION

                  Section  5.1. Termination. (a) Subject to Section 5.2 hereof,
this Agreement may be terminated by notice in writing at any time by either the
Investor or the Company if:

                                    (i)      the Plan of Reorganization is
                  terminated;

                                    (ii)     a transaction pursuant to a
                  Third-Party Offer is consummated; or

                                    (iii)    the Company and the Investor so
                  mutually agree in writing.

                           (b)      Subject to Section 5.2 hereof, and without
limiting any liability of the Company or the Investor for any breach of its
obligations hereunder, this Agreement may be terminated by notice in writing by
either the Investor or the Company at any time after the Investor Group,
collectively, ceases to Beneficially Own at least 10% of the Total Voting Power
of the Company.

         Section 5.2. Effect of Termination. If this Agreement is terminated in
accordance with Section 5.1 hereof, this Agreement shall become null and void
and of no further force and effect except that (i) the terms and provisions of
this Section 5, Section 4.1(a) and Section 6.1 shall remain in full force and
effect, and (ii) any termination of this Agreement shall not relieve any party
hereto from any liability for any breach of its obligations hereunder.

                                    SECTION 6

                                  MISCELLANEOUS

         Section 6.1. Fees and Expenses. Each party shall bear its own expenses,
including the fees and expenses of any Representatives engaged by it, incurred
in connection with the this Agreement and the transactions contemplated hereby.

         Section 6.2. Notices. All notices, requests and other communications
hereunder to a party shall be in writing and shall be deemed given if personally
delivered, telecopied (with confirmation) or three Business Days after being
mailed by registered or certified mail (return receipt requested) or one
Business Day after being delivered by overnight courier to such party at its
address set forth below or such other address as such party may specify by
notice to the parties hereto:

                                       16
<PAGE>   17

                           if to Investor:

                                    Nortel Networks LLC
                                    200 Athens Way
                                    Nashville, TN 37228
                                    Attn: Legal Department
                                    Facsimile: (615) 432-4067

                                    and with a copy to:

                                    Nortel Networks Inc.
                                    2221 Lakeside Blvd.
                                    Richardson, TX 75082
                                    Attn:  Robert Fishman
                                    Facsimile: (972) 684-3888

                           if to Parent:

                                    Nortel Networks Inc.
                                    200 Athens Way
                                    Nashville, TN 37228
                                    Attn: Legal Department
                                    Facsimile: (615) 432-4067

                                    and with a copy to:

                                    Nortel Network Inc.
                                    2221 Lakeside Blvd.
                                    Richardson, TX 75082
                                    Attn:  Robert Fishman
                                    Facsimile: (972) 684-3888

                           if to the Company:

                                    Broadband Parent Corporation
                                    c/o ANTEC Corporation
                                    11450 Technology Circle
                                    Duluth, GA 30097
                                    Attn:  Larry Margolis
                                    Facsimile: (678) 473-8470

                                    and with a copy to:

                                    ANTEC Corporation
                                    11450 Technology Circle
                                    Duluth, GA 30097
                                    Attn:  Bob Stanzione
                                    Facsimile:  (678) 473-8470

                                       17
<PAGE>   18

         Section 6.3. Entire Understanding; Amendment. This Agreement and the
documents described herein or attached or delivered pursuant hereto (including,
without limitation, the Plan of Reorganization and the Registration Rights
Agreement) and the Confidentiality Agreement set forth the entire agreement
between the parties hereto with respect to the matters provided herein and
therein. Any provision of this Agreement may be amended or modified in whole or
in part at any time by an agreement in writing among the parties hereto executed
in the same manner as this Agreement. No failure on the part of any party to
exercise, and no delay in exercising, any right shall operate as waiver thereof,
nor shall any single or partial exercise by either party of any right preclude
any other or future exercise thereof or the exercise of any other right.

         Section 6.4. Counterparts. This Agreement may be executed in two or
more counterparts, each of which shall be deemed to constitute an original but
all of which when taken together shall constitute one and the same instrument.

         Section 6.5. Governing Law. This Agreement shall be governed by, and
interpreted in accordance with, the laws of the State of Delaware, without
regard to the conflict of law principles thereof.

         Section 6.6. Assignment; No Third Party Beneficiaries. (a) Neither this
Agreement, nor any of the rights, interests or obligations shall be assigned by
any of the parties hereto (whether by operation of law or otherwise) without the
prior written consent of the other parties; provided, however that (i) the
Investor may assign its rights, interests and obligations under this Agreement
to any other Affiliate of the Investor in connection with a transfer of Voting
Securities to such Affiliate, without the consent or approval of any other party
hereto, and (ii) in the event of such assignment, the assignee shall agree in
writing to be bound by the provisions of this Agreement.

                  (b)      This Agreement shall not confer any rights or
remedies upon any person other than the parties to this Agreement and their
respective successors and permitted assigns; provided, however, that the
provisions of this Agreement are intended for the benefit of members of the
Investor Group.

         Section 6.7. Remedies; Waiver. To the extent permitted by Law, all
rights and remedies existing under this Agreement and any related agreements or
documents are cumulative to, and are exclusive of, any rights or remedies
otherwise available under applicable Law. No failure on the part of any party to
exercise, or delay in exercising, any right hereunder shall be deemed a waiver
thereof, nor shall any single or partial exercise preclude any further or other
exercise of such or any other right.

         Section 6.8. Specific Performance. Each party hereto acknowledges that,
in view of the uniqueness of the transactions contemplated by this Agreement,
the other party would not have an adequate remedy at law for money damages in
the event that this Agreement has not

                                       18
<PAGE>   19
been performed in accordance with its terms. Each party therefore agrees that
the other party shall be entitled to specific enforcement of the terms hereof in
addition to any other remedy to which it may be entitled, at law or in equity.

         Section 6.9. Severability. Any term or provision of this Agreement
which is invalid or unenforceable in any jurisdiction shall, as to that
jurisdiction, be ineffective to the extent of such invalidity or
unenforceability without rendering invalid or unenforceable the remaining terms
and provisions of this Agreement or affecting the validity or enforceability of
any of the terms or provisions of this Agreement in any other jurisdiction. If
any provision of this Agreement is so broad as to be unenforceable, the
provision shall be interpreted to be only so broad as it is enforceable.

         Section 6.10. Amendment and Restatement. This Agreement amends and
restates in its entirety the Investor Rights Agreement, dated as of October 18,
2000, by and among the Investor, the Parent and the Company (the "Old Investor
Rights Agreement"). The Old Investor Rights Agreement is hereby terminated in
its entirety and is of no further force or effect. The Investor, the Parent and
the Company hereby waive any and all rights, claims, causes of action or
otherwise with respect to the Old Investor Rights Agreement.

                  [Remainder of page intentionally left blank.]

                                       19
<PAGE>   20
         IN WITNESS WHEREOF, this Agreement has been executed on behalf of the
parties hereto by their respective duly authorized officers, all as of the date
first above written.

                                     NORTEL NETWORKS LLC

                                     By: /s/ Craig A. Johnson
                                        ---------------------------------------
                                        Name: Craig A. Johnson
                                        Title:

                                     NORTEL NETWORKS INC.

                                     By: /s/ Craig A. Johnson
                                        ---------------------------------------
                                        Name: Craig A. Johnson
                                        Title:

                                     BROADBAND PARENT CORPORATION

                                     By:/s/ Lawrence A. Margolis
                                        ---------------------------------------
                                        Name:  Lawrence A. Margolis
                                        Title: Vice President and Secretary

                                       20

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