AVICI SYSTEMS INC
AMENDED AND RESTATED 2000 STOCK OPTION AND INCENTIVE PLAN
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<DESCRIPTION>AMENDED AND RESTATED 2000 STOCK OPTION AND INCENTIVE PLAN
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<TITLE>Amended and Restated 2000 Stock Option and Incentive Plan</TITLE>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2"><B>Exhibit 10.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2"><B>AVICI SYSTEMS INC. </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><U>AMENDED AND RESTATED 2000 STOCK OPTION AND INCENTIVE PLAN </U></FONT></P> <P
STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">1.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Purpose and Eligibility</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">The purpose of this
Amended and Restated 2000 Stock Option and Incentive Plan (the &#147;<U>Plan</U>&#148;) of Avici Systems Inc. (the &#147;<U>Company</U>&#148;) is to provide stock options and other equity interests in the Company (each an &#147;<U>Award</U>&#148;)
to employees, officers, directors, consultants and advisors of the Company and its Subsidiaries, all of whom are eligible to receive Awards under the Plan. Any person to whom an Award has been granted under the Plan is called a
&#147;<U>Participant</U>&#148;. Additional definitions are contained in Section&nbsp;8. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">2.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Administration</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a. <U>Administration by Board of
Directors</U>. The Plan will be administered by the Board of Directors of the Company (the &#147;<U>Board</U>&#148;). The Board, in its sole discretion, shall have the authority to grant and amend Awards, to adopt, amend and repeal rules relating to
the Plan and to interpret and correct the provisions of the Plan and any Award. All decisions by the Board shall be final and binding on all interested persons. Neither the Company nor any member of the Board shall be liable for any action or
determination relating to the Plan. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">b. <U>Appointment of Committees</U>. To the extent permitted by applicable law, the Board may delegate
any or all of its powers under the Plan to one or more committees or subcommittees of the Board (a &#147;<U>Committee</U>&#148;). All references in the Plan to the &#147;<U>Board</U>&#148; shall mean such Committee or the Board. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">c. <U>Delegation to Executive Officers</U>. To the extent permitted by applicable law, the Board may delegate to one or more executive officers of the
Company the power to grant Awards and exercise such other powers under the Plan as the Board may determine, <I>provided that</I> the Board shall fix the maximum number of Awards to be granted and the maximum number of shares issuable to any one
Participant pursuant to Awards granted by such executive officers. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">3.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Stock Available for Awards</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a. <U>Number of
Shares</U>. Subject to adjustment under Section&nbsp;3(c), the aggregate number of shares of Common Stock of the Company (the &#147;Common Stock&#148;) that may be issued pursuant to the Plan is equal to the number of shares of Common Stock
authorized but not issued under the 1997 Stock Incentive Plan of the Company, as amended, on or before the date of the initial public offering of the Company&#146;s Common Stock plus (i)&nbsp;the 1,250,000 additional shares authorized for issuance
under the Plan pursuant to the amendment of the Plan in 2001 and (ii)&nbsp;the 1,250,000 additional shares authorized for </FONT>
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<FONT FACE="Times New Roman" SIZE="2">issuance under the Plan pursuant to the amendment of the Plan in 2004 (collectively the &#147;<U>Available Shares</U>&#148;). If any Award expires, or is
terminated, surrendered or forfeited, in whole or in part, the unissued Common Stock covered by such Award shall again be available for the grant of Awards under the Plan. If shares of Common Stock issued pursuant to the Plan are repurchased by, or
are surrendered or forfeited to, the Company at no more than cost, such shares of Common Stock shall again be available for the grant of Awards under the Plan; provided, however, that the cumulative number of such shares that may be so reissued
under the Plan will not exceed the Available Shares. Shares issued under the Plan may consist in whole or in part of authorized but unissued shares or treasury shares. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2">b. <U>Per-Participant Limit</U>. Subject to adjustment under Section&nbsp;3(c), no Participant may be granted Awards during any one fiscal year to purchase more than 500,000 shares of Common Stock. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">c. <U>Adjustment to Common Stock</U>. In the event of any stock split, stock dividend, extraordinary cash dividend, recapitalization, reorganization,
merger, consolidation, combination, exchange of shares, liquidation, spin-off, split-up, or other similar change in capitalization or event (i)&nbsp;the number and class of securities available for Awards under the Plan and the per-Participant share
limit, (ii)&nbsp;the number and class of securities, vesting schedule and exercise price per share subject to each outstanding Option, (iii)&nbsp;the repurchase price per security subject to repurchase, and (iv)&nbsp;the terms of each other
outstanding stock-based Award shall be adjusted by the Board (or substituted Awards may be made), in order in the case of each outstanding Award to preserve the economic value of the Award. If Section&nbsp;7(e)(i) applies for any event, this
Section&nbsp;3(c) shall not be applicable. Adjustments under this Section&nbsp;3(c) shall be mandatory and shall be final, binding and conclusive. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">4.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Stock Options</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a. <U>General</U>. The Board may
grant options to purchase Common Stock (each, an &#147;<U>Option</U>&#148;) and determine the number of shares of Common Stock to be covered by each Option, the exercise price of each Option and the conditions and limitations applicable to the
exercise of each Option and the Common Stock issued upon the exercise of each Option, including vesting provisions, repurchase provisions and restrictions relating to applicable federal or state securities laws, as it considers advisable.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">b. <U>Incentive Stock Options</U>. An Option that the Board intends to be an &#147;incentive stock option&#148; as defined in
Section&nbsp;422 of the Code (an &#147;<U>Incentive Stock Option</U>&#148;) shall be granted only to employees of the Company and shall be subject to and shall be construed consistently with the requirements of Section&nbsp;422 of the Code. The
Board and the Company shall have no liability if an Option or any part thereof that is intended to be an Incentive Stock Option does not qualify as such. An Option or any part thereof that does not qualify as an Incentive Stock Option is referred to
herein as a &#147;<U>Nonstatutory Stock Option</U>.&#148; </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">c. <U>Exercise Price</U>. The Board shall establish the exercise price (or determine the method by which
the exercise price shall be determined) at the time each Option is granted and specify it in the applicable option agreement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">d.
<U>Duration of Options</U>. Each Option shall be exercisable at such times and subject to such terms and conditions as the Board may specify in the applicable option agreement. Following April&nbsp;18, 2007, no Option will be granted for a term in
excess of ten (10)&nbsp;years from the date of grant of the Option. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">e. <U>Exercise of Option</U>. Options may be exercised only by
delivery to the Company of a written notice of exercise signed by the proper person together with payment in full as specified in Section&nbsp;4(f) for the number of shares for which the Option is exercised. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">f. <U>Payment Upon Exercise</U>. Common Stock purchased upon the exercise of an Option shall be paid for by one or any combination of the following forms
of payment: </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px; margin-left:4%; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">(i) by check payable to the order of the Company; </FONT></P> <P
STYLE="margin-top:6px;margin-bottom:0px; margin-left:4%; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">(ii) except as otherwise explicitly provided in the applicable option agreement, and only if the Common Stock is then publicly traded,
delivery of an irrevocable and unconditional undertaking by a creditworthy broker to deliver promptly to the Company sufficient funds to pay the exercise price, or delivery by the Participant to the Company of a copy of irrevocable and unconditional
instructions to a creditworthy broker to deliver promptly to the Company cash or a check sufficient to pay the exercise price; or </FONT></P> <P STYLE="margin-top:6px;margin-bottom:0px; margin-left:4%; text-indent:4%"><FONT FACE="Times New Roman"
SIZE="2">(iii) to the extent explicitly provided in the applicable option agreement, by (x)&nbsp;delivery of shares of Common Stock owned by the Participant valued at fair market value (as determined by the Board or as determined pursuant to the
applicable option agreement), (y)&nbsp;delivery of a promissory note of the Participant to the Company (and delivery to the Company by the Participant of a check in an amount equal to the par value of the shares purchased), or (z)&nbsp;payment of
such other lawful consideration as the Board may determine. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">5.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Restricted Stock</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a. <U>Grants</U>. The Board may
grant Awards entitling recipients to acquire shares of Common Stock, subject to (i)&nbsp;delivery to the Company by the Participant of a check or payment of such other lawful consideration as the Board may determine in an amount at least equal to
the par value of the shares purchased, and (ii)&nbsp;the right of the Company to repurchase all or part of such shares at their issue price or other stated or formula price from the Participant in the event that conditions specified by the Board in
the applicable Award are not satisfied prior to the end of the applicable restriction period or periods established by the Board for such Award (each, a &#147;<U>Restricted Stock Award</U>&#148;). </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">b. <U>Terms and Conditions</U>. The Board shall determine the terms and conditions of any such Restricted
Stock Award. Any stock certificates issued in respect of a Restricted Stock Award shall be registered in the name of the Participant and, unless otherwise determined by the Board, deposited by the Participant, together with a stock power endorsed in
blank, with the Company (or its designee). After the expiration of the applicable restriction periods, the Company (or such designee) shall deliver the certificates no longer subject to such restrictions to the Participant or, if the Participant has
died, to the beneficiary designated by a Participant, in a manner determined by the Board, to receive amounts due or exercise rights of the Participant in the event of the Participant&#146;s death (the &#147;<U>Designated Beneficiary</U>&#148;). In
the absence of an effective designation by a Participant, Designated Beneficiary shall mean the Participant&#146;s estate. Each Restricted Stock Award granted pursuant to the Plan shall be subject to forfeiture if, in the discretion of the Board,
the recipient of such award has not, within a reasonable period of time following the grant of such award, executed any instrument required by the Board to be executed in connection with such award. </FONT></P> <P
STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">6.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Other Stock-Based Awards</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">The Board shall have the
right to grant other Awards based upon the Common Stock having such terms and conditions as the Board may determine, including, without limitation, the grant of shares based upon certain conditions, the grant of securities convertible into Common
Stock and the grant of stock appreciation rights, phantom stock awards or stock units. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">7.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>General Provisions Applicable to Awards</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a.
<U>Transferability of Awards</U>. Except as the Board may otherwise determine or provide in an Award, Awards shall not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily or by
operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, shall be exercisable only by the Participant. References to a Participant, to the extent relevant in the context, shall include
references to authorized transferees. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">b. <U>Documentation</U>. Each Award under the Plan shall be evidenced by a written instrument in
such form as the Board shall determine or as executed by an officer of the Company pursuant to authority delegated by the Board. Each Award may contain terms and conditions in addition to those set forth in the Plan <I>provided that</I> such terms
and conditions do not contravene the provisions of the Plan. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">c. <U>Board Discretion</U>. The terms of each type of Award need not be
identical, and the Board need not treat Participants uniformly. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">d. <U>Termination of Status</U>. The Board shall determine the effect on
an Award of the disability, death, retirement, authorized leave of absence or other change in the employment or other status of a Participant and the extent to which, and the period during </FONT>
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<FONT FACE="Times New Roman" SIZE="2">which, the Participant, or the Participant&#146;s legal representative, conservator, guardian or Designated Beneficiary, may exercise rights under the Award.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">e. <U>Acquisition of the Company</U> </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:4%; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2">(i) <U>Consequences of an Acquisition</U>. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(A) Upon the consummation of an Acquisition, the Board shall
take any one or more of the following actions with respect to then outstanding Awards: (a)&nbsp;provide that outstanding Options shall be assumed, or equivalent Options shall be substituted, by the acquiring or succeeding corporation (or an
affiliate thereof), provided that any such Options substituted for Incentive Stock Options shall satisfy, in the determination of the Board, the requirements of Section&nbsp;424(a) of the Code; (b)&nbsp;upon written notice to the Participants,
provide that all or a portion of then unexercised Options will become exercisable in full or in part as of a specified time (the &#147;<U>Acceleration Time</U>&#148;) prior to the Acquisition and will terminate immediately prior to the consummation
of such Acquisition, except to the extent exercised by the Participants between the Acceleration Time and the consummation of such Acquisition; (c)&nbsp;in the event of an Acquisition under the terms of which holders of Common Stock will receive
upon consummation thereof a cash payment for each share of Common Stock surrendered pursuant to such Acquisition (the &#147;<U>Acquisition Price</U>&#148;), provide that all outstanding Options shall terminate upon consummation of such Acquisition
and each Participant shall receive, in exchange therefor, a cash payment equal to the amount (if any) by which (x)&nbsp;the Acquisition Price multiplied by the number of shares of Common Stock subject to such outstanding Options (whether or not then
exercisable), exceeds (y)&nbsp;the aggregate exercise price of such Options; (d)&nbsp;provide that all or any portion of the Restricted Stock Awards then outstanding shall become free of all or certain restrictions prior to the consummation of the
Acquisition; and (e)&nbsp;provide that any other stock-based Awards outstanding (x)&nbsp;shall become exercisable, realizable or vested in full or in part, or shall be free of all or certain conditions or restrictions, as applicable to each such
Award, prior to the consummation of the Acquisition, or (y), if applicable, shall be assumed, or equivalent Awards shall be substituted, by the acquiring or succeeding corporation (or an affiliate thereof). </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(B) <U>Acquisition Defined</U>. An &#147;<U>Acquisition</U>&#148; shall mean: (x)&nbsp;the sale of the Company by merger in which the shareholders of the
Company in their capacity as such no longer own a majority of the outstanding equity securities of the Company (or its successor); or (y)&nbsp;any sale of all or substantially all of the assets or capital stock of the Company (other than in a
spin-off or similar transaction) or (z)&nbsp;any other acquisition of the business of the Company, as determined by the Board. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(ii)
<U>Assumption of Options Upon Certain Events</U>. In connection with a merger or consolidation of an entity with the Company or the acquisition by the Company of property or stock of an entity, the Board may grant Awards under the Plan in
substitution for stock and stock-based awards issued by such entity or an affiliate thereof. </FONT>
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<FONT FACE="Times New Roman" SIZE="2">The substitute Awards shall be granted on such terms and conditions as the Board considers appropriate in the circumstances. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(iii) <U>Pooling-of Interests-Accounting</U>. If the Company proposes to engage in an Acquisition intended to be accounted for as a pooling-of-interests,
and in the event that the provisions of this Plan or of any Award hereunder, or any actions of the Board taken in connection with such Acquisition, are determined by the Company&#146;s or the acquiring company&#146;s independent public accountants
to cause such Acquisition to fail to be accounted for as a pooling-of-interests, then such provisions or actions shall be amended or rescinded by the Board, without the consent of any Participant, to be consistent with pooling-of-interests
accounting treatment for such Acquisition. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(iv) <U>Parachute Awards</U>. Notwithstanding the provisions of Section&nbsp;7(e)(i)(A), if, in
connection with an Acquisition described therein, a tax under Section&nbsp;4999 of the Code would be imposed on the Participant (after taking into account the exceptions set forth in Sections 280G(b)(4) and 280G(b)(5) of the Code), then the number
of Awards which shall become exercisable, realizable or vested as provided in such section shall be reduced (or delayed), to the minimum extent necessary, so that no such tax would be imposed on the Participant (the Awards not becoming so
accelerated, realizable or vested, the &#147;<U>Parachute Awards</U>&#148;); <I>provided, however,</I> that if the &#147;aggregate present value&#148; of the Parachute Awards would exceed the tax that, but for this sentence, would be imposed on the
Participant under Section&nbsp;4999 of the Code in connection with the Acquisition, then the Awards shall become immediately exercisable, realizable and vested without regard to the provisions of this sentence. For purposes of the preceding
sentence, the &#147;aggregate present value&#148; of an Award shall be calculated on an after-tax basis (other than taxes imposed by Section&nbsp;4999 of the Code) and shall be based on economic principles rather than the principles set forth under
Section&nbsp;280G of the Code and the regulations promulgated thereunder. All determinations required to be made under this Section&nbsp;7(e)(iv) shall be made by the Company. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">f. <U>Withholding</U>. Each Participant shall pay to the Company, or make provisions satisfactory to the Company for payment of, any taxes required by
law to be withheld in connection with Awards to such Participant no later than the date of the event creating the tax liability. The Board may allow Participants to satisfy such tax obligations in whole or in part by transferring shares of Common
Stock, including shares retained from the Award creating the tax obligation, valued at their fair market value (as determined by the Board or as determined pursuant to the applicable option agreement). The Company may, to the extent permitted by
law, deduct any such tax obligations from any payment of any kind otherwise due to a Participant. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">g. <U>Amendment of Awards</U>. The Board
may amend, modify or terminate any outstanding Award including, but not limited to, substituting therefor another Award of the same or a different type, changing the date of exercise or realization, and converting an Incentive Stock Option to a
Nonstatutory Stock Option, <I>provided that</I>, except as otherwise provided in Section&nbsp;7(e)(iii), the Participant&#146;s consent to such action shall be required unless the Board determines that the action, taking into account any related
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<FONT FACE="Times New Roman" SIZE="2">action, would not materially and adversely affect the Participant, <I>provided further that</I>, no Award may be repriced by cancellation or amendment of
such Award without approval of the shareholders of the Company (except pursuant to Section&nbsp;3(c) or 7(e)) if the effect would be to reduce the exercise price for the shares underlying such Award. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">h. <U>Conditions on Delivery of Stock</U>. The Company will not be obligated to deliver any shares of Common Stock pursuant to the Plan or to remove
restrictions from shares previously delivered under the Plan until (i)&nbsp;all conditions of the Award have been met or removed to the satisfaction of the Company, (ii)&nbsp;in the opinion of the Company&#146;s counsel, all other legal matters in
connection with the issuance and delivery of such shares have been satisfied, including any applicable securities laws and any applicable stock exchange or stock market rules and regulations, and (iii)&nbsp;the Participant has executed and delivered
to the Company such representations or agreements as the Company may consider appropriate to satisfy the requirements of any applicable laws, rules or regulations. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2">i. <U>Acceleration</U>. The Board may at any time provide that any Options shall become immediately exercisable in full or in part, that any Restricted Stock Awards shall be free of some or all restrictions, or that
any other stock-based Awards may become exercisable in full or in part or free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be, despite the fact that the foregoing actions may (i)&nbsp;cause
the application of Sections 280G and 4999 of the Code if a change in control of the Company occurs, or (ii)&nbsp;disqualify all or part of the Option as an Incentive Stock Option. </FONT></P> <P
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">8.</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2"><U>Miscellaneous</U> </FONT></TD></TR></TABLE> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">a. <U>Definitions</U>. </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(i) &#147;<U>Company,</U>&#148; for purposes of eligibility under the Plan, shall include any present or future subsidiary corporations of Avici
Systems Inc., as defined in Section&nbsp;424(f) of the Code (a &#147;<U>Subsidiary</U>&#148;), and any present or future parent corporation of Avici Systems Inc., as defined in Section&nbsp;424(e) of the Code. For purposes of Awards other than
Incentive Stock Options, the term &#147;<U>Company</U>&#148; shall include any other business venture in which the Company has a direct or indirect significant interest, as determined by the Board in its sole discretion. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(ii) &#147;<U>Code</U>&#148; means the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:8%"><FONT FACE="Times New Roman" SIZE="2">(iii) &#147;<U>employee</U>&#148; for purposes of eligibility under the Plan (but not for purposes of Section&nbsp;4(b)) shall include a person to whom
an offer of employment has been extended by the Company. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">b. <U>No Right To Employment or Other Status</U>. No person shall have any claim
or right to be granted an Award, and the grant of an Award shall not be construed </FONT>
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<FONT FACE="Times New Roman" SIZE="2">as giving a Participant the right to continued employment or any other relationship with the Company. The Company expressly reserves the right at any time to
dismiss or otherwise terminate its relationship with a Participant free from any liability or claim under the Plan. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">c. <U>No Rights As
Stockholder</U>. Subject to the provisions of the applicable Award, no Participant or Designated Beneficiary shall have any rights as a stockholder with respect to any shares of Common Stock to be distributed with respect to an Award until becoming
the record holder thereof. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">d. <U>Effective Date and Term of Plan</U>. The Plan shall become effective on the date on which it is adopted
by the Board. No Awards shall be granted under the Plan after the completion of ten years from the date on which the Plan was adopted by the Board, but Awards previously granted may extend beyond that date. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">e. <U>Amendment of Plan</U>. The Board may amend, suspend or terminate the Plan or any portion thereof at any time. </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">f. <U>Governing Law</U>. The provisions of the Plan and all Awards made hereunder shall be governed by and interpreted in accordance with the laws of
Delaware, without regard to any applicable conflicts of law. </FONT></P> <P STYLE="margin-top:18px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2">Amendment and Restatement Adopted by </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2">Board of Directors </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT
FACE="Times New Roman" SIZE="2">April&nbsp;18, 2007 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2">Amendment and Restatement Adopted by </FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2">Stockholders </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:54%; text-indent:-2%"><FONT FACE="Times New Roman"
SIZE="2">May&nbsp;31, 2007 </FONT></P>
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