Document:

2007 Equity Incentive Plan

 Exhibit 10.2 
 FORCE10 NETWORKS, INC. 
 2007 EQUITY INCENTIVE PLAN

 As Adopted on January 29, 2007 
 As Approved by the Stockholders on January 30, 2007 
 Amended by the
Board of Directors: February 6, 2008 
 Amendment Adopted by the Stockholders: March 5, 2008 
 Amended by the Board of Directors: 
 approved December 29, 2008 and effective as of March 31, 2009 
 Amendment Adopted by the Stockholders: March 20, 2009 
 Amended by the Board of Directors:

 approved May 14, 2009 and effective as of June 18, 2009 
 Amendment Adopted by the Stockholders: June 18, 2009 
 Amended by the Board of Directors: November 4, 2009 
 Amendment
Adopted by the Stockholders: November 12, 2009 
 1. PURPOSE. The purpose of this Plan is
to provide incentives to attract, retain and motivate eligible persons whose present and potential contributions are important to the success of the Company, its Parent and Subsidiaries, by offering them an opportunity to participate in the
Company’s future performance through awards of Options and Restricted Stock. Capitalized terms not defined in the text are defined in Section 22 hereof. Although this Plan is intended to be a written compensatory benefit plan within the
meaning of Rule 701 promulgated under the Securities Act, grants may be made pursuant to this plan which do not qualify for exemption under Rule 701 or Section 25102(o) of the California Corporations Code. Any requirement of this Plan
which is required in law only because of Section 25102(o) need not apply if the Committee so provides. 
 2. SHARES
SUBJECT TO THE PLAN. 
 2.1 Number of Shares Available. Subject to Sections 2.2 and 17, the total number
of Shares reserved and available for grant and issuance pursuant to this Plan will be 10,924,040 Shares. Subject to Sections 2.2, 5.10 and 17 hereof, Shares subject to Awards previously granted will again be available for grant and issuance in
connection with future Awards under this Plan to the extent such Shares: (i) cease to be subject to issuance upon exercise of an Option, other than due to exercise of such Option; (ii) are subject to an Award granted hereunder but the
Shares subject to such Award are forfeited or repurchased by the Company at the original issue price; or (iii) are subject to an Award that otherwise terminates without Shares being issued. At all times the Company will reserve and keep
available a sufficient number of Shares as will be required to satisfy the requirements of all Awards granted and outstanding under this Plan. 

 2.2 Adjustment of Shares. In the event that the number of outstanding shares
of the Company’s Common Stock is changed by a stock dividend, recapitalization, stock split, reverse stock split, subdivision, combination, reclassification or similar change in the capital structure of the Company without consideration, then
(i) the number of Shares reserved for issuance under this Plan, (ii) the Exercise Prices of and number of Shares subject to outstanding Options and (iii) the Purchase Prices of and number of Shares subject to other outstanding Awards
will be proportionately adjusted, subject to any required action by the Board or the stockholders of the Company and compliance with applicable securities laws; provided, however, that fractions of a Share will not be issued but will either be paid
in cash at the Fair Market Value of such fraction of a Share or will be rounded down to the nearest whole Share, as determined by the Committee; and provided, further, that the Exercise Price of any Option may not be decreased to below the par value
of the Shares. 
 3. ELIGIBILITY. ISOs (as defined in Section 5 hereof) may be granted only to employees
(including officers and directors who are also employees) of the Company or of a Parent or Subsidiary of the Company. NQSOs (as defined in Section 5 hereof) and Restricted Stock Awards may be granted to employees, officers, directors and
consultants of the Company or any Parent or Subsidiary of the Company; provided such consultants render bona fide services not in connection with the offer and sale of securities in a capital-raising transaction. A person may be granted more than
one Award under this Plan. 
 4. ADMINISTRATION. 
 4.1 Committee Authority. This Plan will be administered by the Committee or the Board if no Committee is created by the Board.
Subject to the general purposes, terms and conditions of this Plan, and to the direction of the Board, the Committee will have full power to implement and carry out this Plan. Without limitation, the Committee will have the authority to: 

(a) construe and interpret this Plan, any Award Agreement and any other agreement or document executed pursuant to this Plan;

 (b) prescribe, amend and rescind rules and regulations relating to this Plan; 
 (c) approve persons to receive Awards; 
 (d) determine the form and terms of Awards; 
 (e) determine the number of Shares
or other consideration subject to Awards; 
 (f) determine whether Awards will be granted singly, in combination with, in
tandem with, in replacement of, or as alternatives to, other Awards under this Plan or awards under any other incentive or compensation plan of the Company or any Parent or Subsidiary of the Company; 
  

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 (g) grant waivers of any conditions of this Plan or any Award; 
 (h) determine the terms of vesting, exercisability and payment of Awards; 
 (i) correct any defect, supply any omission, or reconcile any inconsistency in this Plan, any Award, any Award Agreement, any Exercise
Agreement or any Restricted Stock Purchase Agreement; 
 (j) determine whether an Award has been earned; 
 (k) make all other determinations necessary or advisable for the administration of this Plan; and 
 (l) extend the vesting period beyond a Participant’s Termination Date. 
 4.2 Committee Discretion. Unless in contravention of any express terms of this Plan or Award, any determination made by the
Committee with respect to any Award will be made in its sole discretion either (i) at the time of grant of the Award, or (ii) subject to Section 5.9 hereof, at any later time. Any such determination will be final and binding on the
Company and on all persons having an interest in any Award under this Plan. The Committee may delegate to one or more officers of the Company the authority to grant an Award under this Plan, provided such officer or officers are members of the
Board. 
 5. OPTIONS. The Committee may grant Options to eligible persons described in Section 3 hereof and
will determine whether such Options will be Incentive Stock Options within the meaning of the Code (“ISOs”) or Nonqualified Stock Options (“NQSOs”), the number of Shares subject to the Option, the
Exercise Price of the Option, the period during which the Option may be exercised, and all other terms and conditions of the Option, subject to the following: 
 5.1 Form of Option Grant. Each Option granted under this Plan will be evidenced by an Award Agreement which will expressly identify the Option as an ISO or an NQSO (“Stock Option
Agreement”), and will be in such form and contain such provisions (which need not be the same for each Participant) as the Committee may from time to time approve, and which will comply with and be subject to the terms and conditions of
this Plan. 
 5.2 Date of Grant. The date of grant of an Option will be the date on which the Committee makes the
determination to grant such Option, unless a later date is otherwise specified by the Committee. The Stock Option Agreement and a copy of this Plan will be delivered to the Participant within a reasonable time after the granting of the Option.

 5.3 Exercise Period. Options may be exercisable immediately but subject to repurchase pursuant to
Section 11 hereof or may be exercisable within the times or upon the events determined by the Committee as set forth in the Stock Option Agreement governing such Option; provided, however, that no Option will be exercisable after the expiration
of ten (10) years from the date the Option is granted; and provided further that no ISO granted to a person who directly or by attribution owns more than ten percent (10%) of the total combined voting

  

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power of all classes of stock of the Company or of any Parent or Subsidiary of the Company (“Ten Percent Stockholder”) will be exercisable after the expiration of five
(5) years from the date the ISO is granted. The Committee also may provide for Options to become exercisable at one time or from time to time, periodically or otherwise, in such number of Shares or percentage of Shares as the Committee
determines. Subject to earlier termination of the Option as provided herein, to the extent section 25102(o) of the California Corporations Code is intended to apply, each Participant who is not an officer, director or consultant of the Company or of
a Parent or Subsidiary of the Company shall have the right to exercise an Option granted hereunder at the rate of no less than twenty percent (20%) per year over five (5) years from the date such Option is granted. 
 5.4 Exercise Price. The Exercise Price of an Option will be determined by the Committee when the Option is granted and may not
be less than eighty-five percent (85%) of the Fair Market Value of the Shares on the date of grant; provided that (i) the Exercise Price of an ISO will not be less than one hundred percent (100%) of the Fair Market Value of the Shares
on the date of grant and (ii) the Exercise Price of any Option granted to a Ten Percent Stockholder will not be less than one hundred ten percent (110%) of the Fair Market Value of the Shares on the date of grant. Payment for the Shares
purchased must be made in accordance with Section 7 hereof. 
 5.5 Method of Exercise. Options may be
exercised only by delivery to the Company of a written stock option exercise agreement (the “Exercise Agreement”) in a form approved by the Committee (which need not be the same for each Participant). The Exercise Agreement
will state (i) the number of Shares being purchased, (ii) the restrictions imposed on the Shares purchased under such Exercise Agreement, if any, and (iii) such representations and agreements regarding Participant’s investment
intent and access to information and other matters, if any, as may be required or desirable by the Company to comply with applicable securities laws. Participant shall execute and deliver to the Company the Exercise Agreement together with payment
in full of the Exercise Price, and any applicable taxes, for the number of Shares being purchased. 
 5.6
Termination. Subject to earlier termination pursuant to Sections 17 and 18 hereof and notwithstanding the exercise periods set forth in the Stock Option Agreement, exercise of an Option will always be subject to the following:

 (a) If the Participant is Terminated for any reason other than death, Disability or for Cause, then the Participant may
exercise such Participant’s Options only to the extent that such Options are exercisable as to Vested Shares upon the Termination Date or as otherwise determined by the Committee. Such Options must be exercised by the Participant, if at all, as
to all or some of the Vested Shares calculated as of the Termination Date or such other date determined by the Committee, within three (3) months after the Termination Date (or within such shorter time period, not less than thirty
(30) days, or within such longer time period, not exceeding five (5) years, after the Termination Date as may be determined by the Committee, with any exercise beyond three (3) months after the Termination Date deemed to be an NQSO)
but in any event, no later than the expiration date of the Options. 
  

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 (b) If the Participant is Terminated because of Participant’s death or Disability (or
the Participant dies within three (3) months after a Termination other than for Cause), then Participant’s Options may be exercised only to the extent that such Options are exercisable as to Vested Shares by Participant on the Termination
Date or as otherwise determined by the Committee. Such options must be exercised by Participant (or Participant’s legal representative or authorized assignee), if at all, as to all or some of the Vested Shares calculated as of the Termination
Date or such other date determined by the Committee, within twelve (12) months after the Termination Date (or within such shorter time period, not less than six (6) months, or within such longer time period, not exceeding five
(5) years, after the Termination Date as may be determined by the Committee, with any exercise beyond (i) three (3) months after the Termination Date when the Termination is for any reason other than the Participant’s death or
disability, within the meaning of Section 22(e)(3) of the Code, or (ii) twelve (12) months after the Termination Date when the Termination is for Participant’s disability, within the meaning of Section 22(e)(3) of the Code,
deemed to be an NQSO) but in any event no later than the expiration date of the Options. 
 (c) If the Participant is
terminated for Cause, the Participant may exercise such Participant’s Options, but not to an extent greater than such Options are exercisable as to Vested Shares upon the Termination Date and Participant’s Options shall expire on such
Participant’s Termination Date, or at such later time and on such conditions as are determined by the Committee. 
 5.7
Limitations on Exercise. The Committee may specify a reasonable minimum number of Shares that may be purchased on any exercise of an Option, provided that such minimum number will not prevent Participant from exercising the Option for the
full number of Shares for which it is then exercisable. 
 5.8 Limitations on ISOs. The aggregate Fair Market
Value (determined as of the date of grant) of Shares with respect to which ISOs are exercisable for the first time by a Participant during any calendar year (under this Plan or under any other incentive stock option plan of the Company or any Parent
or Subsidiary of the Company) will not exceed One Hundred Thousand Dollars ($100,000). If the Fair Market Value of Shares on the date of grant with respect to which ISOs are exercisable for the first time by a Participant during any calendar year
exceeds One Hundred Thousand Dollars ($100,000), then the Options for the first One Hundred Thousand Dollars ($100,000) worth of Shares to become exercisable in such calendar year will be ISOs and the Options for the amount in excess of One Hundred
Thousand Dollars ($100,000) that become exercisable in that calendar year will be NQSOs. In the event that the Code or the regulations promulgated thereunder are amended after the Effective Date (as defined in Section 18 hereof) to provide for
a different limit on the Fair Market Value of Shares permitted to be subject to ISOs, then such different limit will be automatically incorporated herein and will apply to any Options granted after the effective date of such amendment. 

5.9 Modification, Extension or Renewal. The Committee may modify, extend or renew outstanding Options and authorize the
grant of new Options in substitution therefor, provided that any such action may not, without the written consent of a Participant, impair any of such Participant’s rights under any Option previously granted. Any outstanding ISO that is
modified, extended, renewed or otherwise altered will be treated in accordance with

  

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Section 424(h) of the Code. Subject to Section 5.10 hereof, the Committee may reduce the Exercise Price of outstanding Options without the consent of Participants by a written notice to
them; provided, however, that the Exercise Price may not be reduced below the minimum Exercise Price that would be permitted under Section 5.4 hereof for Options granted on the date the action is taken to reduce the Exercise Price; provided,
further, that the Exercise Price will not be reduced below the par value of the Shares, if any. 
 5.10 No
Disqualification. Notwithstanding any other provision in this Plan, no term of this Plan relating to ISOs will be interpreted, amended or altered, nor will any discretion or authority granted under this Plan be exercised, so as to disqualify
this Plan under Section 422 of the Code or, without the consent of the Participant, to disqualify any Participant’s ISO under Section 422 of the Code. In no event shall the total number of Shares issued (counting each reissuance of a
Share that was previously issued and then forfeited or repurchased by the Company as a separate issuance) under the Plan upon exercise of ISOs exceed 6,000,000 Shares (adjusted in proportion to any adjustments under Section 2.2 hereof) over the
term of the Plan. 
 6. RESTRICTED STOCK. A Restricted Stock Award is an offer by the Company to sell to an
eligible person Shares that are subject to certain specified restrictions. The Committee will determine to whom an offer will be made, the number of Shares the person may purchase, the Purchase Price, the restrictions to which the Shares will be
subject, and all other terms and conditions of the Restricted Stock Award, subject to the following: 
 6.1 Form of
Restricted Stock Award. All purchases under a Restricted Stock Award made pursuant to this Plan will be evidenced by an Award Agreement (“Restricted Stock Purchase Agreement”) that will be in such form (which need not
be the same for each Participant) as the Committee will from time to time approve, and will comply with and be subject to the terms and conditions of this Plan. The Restricted Stock Award will be accepted by the Participant’s execution and
delivery of the Restricted Stock Purchase Agreement and full payment for the Shares to the Company within thirty (30) days from the date the Restricted Stock Purchase Agreement is delivered to the person. If such person does not execute and
deliver the Restricted Stock Purchase Agreement along with full payment for the Shares to the Company within such thirty (30) days, then the offer will terminate, unless otherwise determined by the Committee. 
 6.2 Purchase Price. The Purchase Price of Shares sold pursuant to a Restricted Stock Award will be determined by the Committee
and will be at least eighty-five percent (85%) of the Fair Market Value of the Shares on the date the Restricted Stock Award is granted or at the time the purchase is consummated, except in the case of a sale to a Ten Percent Stockholder, in
which case the Purchase Price will be one hundred percent (100%) of the Fair Market Value on the date the Restricted Stock Award is granted or at the time the purchase is consummated. Payment of the Purchase Price must be made in accordance
with Section 7 hereof. 
 6.3 Restrictions. Restricted Stock Awards may be subject to the restrictions set
forth in Section 11 hereof or such other restrictions not inconsistent with Section 25102(o) of the California Corporations Code. 
  

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 7. PAYMENT FOR SHARE PURCHASES. 
 7.1 Payment. Payment for Shares purchased pursuant to this Plan may be made in cash (by check) or, where expressly approved for
the Participant by the Committee and where permitted by law: 
 (a) by cancellation of indebtedness of the Company owed to the
Participant; 
 (b) by surrender of shares that: (i) either (A) have been owned by Participant for more than six
(6) months and have been paid for within the meaning of SEC Rule 144 (and, if such shares were purchased from the Company by use of a promissory note, such note has been fully paid with respect to such shares) or (B) were obtained by
Participant in the public market and (ii) are clear of all liens, claims, encumbrances or security interests; 
 (c) by
tender of a full recourse promissory note having such terms as may be approved by the Committee and bearing interest at a rate sufficient to avoid (i) imputation of income under Sections 483 and 1274 of the Code and (ii) variable
accounting treatment under Financial Accounting Standards Board Interpretation No. 44 to APB No. 25; provided, however, that Participants who are not employees or directors of the Company will not be entitled to purchase Shares with a
promissory note unless the note is adequately secured by collateral other than the Shares; provided, further, that the portion of the Exercise Price or Purchase Price, as the case may be, equal to the par value of the Shares must be paid in cash or
other legal consideration permitted by Delaware General Corporation Law; 
 (d) by waiver of compensation due or accrued to the
Participant from the Company for services rendered; 
 (e) with respect only to purchases upon exercise of an Option, and
provided that a public market for the Company’s stock exists: 
 (i) through a “same day sale” commitment from
the Participant and a broker-dealer that is a member of the National Association of Securities Dealers (an “NASD Dealer”) whereby the Participant irrevocably elects to exercise the Option and to sell a portion of the Shares
so purchased sufficient to pay the total Exercise Price, and whereby the NASD Dealer irrevocably commits upon receipt of such Shares to forward the total Exercise Price directly to the Company; or 
 (ii) through a “margin” commitment from the Participant and an NASD Dealer whereby the Participant irrevocably elects to exercise
the Option and to pledge the Shares so purchased to the NASD Dealer in a margin account as security for a loan from the NASD Dealer in the amount of the total Exercise Price, and whereby the NASD Dealer irrevocably commits upon receipt of such
Shares to forward the total Exercise Price directly to the Company; or 
 (f) by any combination of the foregoing. 

 

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 7.2 Loan Guarantees. The Committee may, in its sole discretion, elect to
assist the Participant in paying for Shares purchased under this Plan by authorizing a guarantee by the Company of a third-party loan to the Participant. 
 8. WITHHOLDING TAXES. 
 8.1 Withholding Generally. Whenever
Shares are to be issued in satisfaction of Awards granted under this Plan, the Company may require the Participant to remit to the Company an amount sufficient to satisfy federal, state and local withholding tax requirements prior to the delivery of
any certificate or certificates for such Shares. Whenever, under this Plan, payments in satisfaction of Awards are to be made in cash by the Company, such payment will be net of an amount sufficient to satisfy federal, state, and local withholding
tax requirements. 
 8.2 Stock Withholding. When, under applicable tax laws, a Participant incurs tax liability in
connection with the exercise or vesting of any Award that is subject to tax withholding and the Participant is obligated to pay the Company the amount required to be withheld, the Committee may in its sole discretion allow the Participant to satisfy
the minimum withholding tax obligation by electing to have the Company withhold from the Shares to be issued that minimum number of Shares having a Fair Market Value equal to the minimum amount required to be withheld, determined on the date that
the amount of tax to be withheld is to be determined; but in no event will the Company withhold Shares if such withholding would result in adverse accounting consequences to the Company. All elections by a Participant to have Shares withheld for
this purpose will be made in accordance with the requirements established by the Committee for such elections and be in writing in a form acceptable to the Committee. 
 9. PRIVILEGES OF STOCK OWNERSHIP. 
 9.1 Voting and Dividends.
No Participant will have any of the rights of a stockholder with respect to any Shares until the Shares are issued to the Participant. After Shares are issued to the Participant, the Participant will be a stockholder and have all the rights of a
stockholder with respect to such Shares, including the right to vote and receive all dividends or other distributions made or paid with respect to such Shares; provided, that if such Shares are Restricted Stock, then any new, additional or different
securities the Participant may become entitled to receive with respect to such Shares by virtue of a stock dividend, stock split or any other change in the corporate or capital structure of the Company will be subject to the same restrictions as the
Restricted Stock. The Participant will have no right to retain such stock dividends or stock distributions with respect to Unvested Shares that are repurchased pursuant to Section 11 hereof. To the extent required, the Company will comply with
Section 260.140.1 of Title 10 of the California Code of Regulations with respect to the voting rights of Common Stock. 
 9.2 Financial Statements. The Company will provide financial statements to each Participant annually during the period such Participant has Awards outstanding, or as otherwise required under Section 260.140.46 of
Title 10 of the California Code of Regulations. Notwithstanding the foregoing, the Company will not be required to provide such financial statements to Participants when issuance of Awards is limited to key employees whose services in
connection with the Company assure them access to equivalent information. 
  

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 10. TRANSFERABILITY. Except as permitted by the Committee,
Awards granted under this Plan, and any interest therein, will not be transferable or assignable by Participant, other than by will or by the laws of descent and distribution, and, with respect to NQSOs, by instrument to an inter vivos or
testamentary trust in which the options are to be passed to beneficiaries upon the death of the trustor (settlor), or by gift to “immediate family” as that term is defined in 17 C.F.R. 240.16a-1(e), and may not be made subject to
execution, attachment or similar process. During the lifetime of the Participant an Award will be exercisable only by the Participant or Participant’s legal representative and any elections with respect to an Award may be made only by the
Participant or Participant’s legal representative. 
 11. RESTRICTIONS ON SHARES. 
 11.1 Right of First Refusal. At the discretion of the Committee, the Company may reserve to itself and/or its assignee(s) in
the Award Agreement a right of first refusal to purchase all Shares that a Participant (or a subsequent transferee) may propose to transfer to a third party, unless otherwise not permitted by Section 25102(o) of the California Corporations
Code, provided that such right of first refusal terminates upon the Company’s initial public offering of Common Stock pursuant to an effective registration statement filed under the Securities Act. 
 11.2 Right of Repurchase. At the discretion of the Committee, the Company may reserve to itself and/or its assignee(s) in the
Award Agreement a right to repurchase Unvested Shares held by a Participant for cash and/or cancellation of purchase money indebtedness owed to the Company by the Participant following such Participant’s Termination at any time within the later
of ninety (90) days after the Participant’s Termination Date and the date the Participant purchases Shares under the Plan at the Participant’s Exercise Price or Purchase Price, as the case may be, provided that to the extent
Section 25102(o) of the California Corporations Code is intended to apply, unless the Participant is an officer, director or consultant of the Company or of a Parent or Subsidiary of the Company, such right of repurchase lapses at the rate of
no less than twenty percent (20%) per year over five (5) years from: (a) the date of grant of the Option or (b) in the case of Restricted Stock, the date the Participant purchases the Shares. 
 12. CERTIFICATES. All certificates for Shares or other securities delivered under this Plan will be subject to such
stock transfer orders, legends and other restrictions as the Committee may deem necessary or advisable, including restrictions under any applicable federal, state or foreign securities law, or any rules, regulations and other requirements of the SEC
or any stock exchange or automated quotation system upon which the Shares may be listed or quoted. 
 13. ESCROW; PLEDGE
OF SHARES. To enforce any restrictions on a Participant’s Shares set forth in Section 11 hereof, the Committee may require the Participant to deposit all certificates representing Shares, together with stock powers or other
instruments of transfer approved by the Committee, appropriately endorsed in blank, with the Company or an agent designated by the Company to hold in escrow until such restrictions have lapsed or

  

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terminated. The Committee may cause a legend or legends referencing such restrictions to be placed on the certificates. Any Participant who is permitted to execute a promissory note as partial or
full consideration for the purchase of Shares under this Plan will be required to pledge and deposit with the Company all or part of the Shares so purchased as collateral to secure the payment of Participant’s obligation to the Company under
the promissory note; provided, however, that the Committee may require or accept other or additional forms of collateral to secure the payment of such obligation and, in any event, the Company will have full recourse against the Participant under
the promissory note notwithstanding any pledge of the Participant’s Shares or other collateral. In connection with any pledge of the Shares, Participant will be required to execute and deliver a written pledge agreement in such form as the
Committee will from time to time approve. The Shares purchased with the promissory note may be released from the pledge on a pro rata basis as the promissory note is paid. 
 14. EXCHANGE AND BUYOUT OF AWARDS. The Committee may, at any time or from time to time, authorize the Company, with the
consent of the respective Participants, to issue new Awards in exchange for the surrender and cancellation of any or all outstanding Awards. The Committee may at any time buy from a Participant an Award previously granted with payment in cash,
shares of Common Stock of the Company (including Restricted Stock) or other consideration, based on such terms and conditions as the Committee and the Participant may agree. 
 15. SECURITIES LAW AND OTHER REGULATORY COMPLIANCE. Although this Plan is intended to be a written compensatory
benefit plan within the meaning of Rule 701 promulgated under the Securities Act, grants may be made pursuant to this plan that do not qualify for exemption under Rule 701 or Section 25102(o) of the California Corporations Code. Any
requirement of this Plan which is required in law only because of Section 25102(o) need not apply if the Committee so provides. An Award will not be effective unless such Award is in compliance with all applicable federal and state securities
laws, rules and regulations of any governmental body, and the requirements of any stock exchange or automated quotation system upon which the Shares may then be listed or quoted, as they are in effect on the date of grant of the Award and also on
the date of exercise or other issuance. Notwithstanding any other provision in this Plan, the Company will have no obligation to issue or deliver certificates for Shares under this Plan prior to (i) obtaining any approvals from governmental
agencies that the Company determines are necessary or advisable, and/or (ii) compliance with any exemption, completion of any registration or other qualification of such Shares under any state or federal law or ruling of any governmental body
that the Company determines to be necessary or advisable. The Company will be under no obligation to register the Shares with the SEC or to effect compliance with the exemption, registration, qualification or listing requirements of any state
securities laws, stock exchange or automated quotation system, and the Company will have no liability for any inability or failure to do so. 
 16. NO OBLIGATION TO EMPLOY. Nothing in this Plan or any Award granted under this Plan will confer or be deemed to confer on any Participant any right to continue in the employ
of, or to continue any other relationship with, the Company or any Parent or Subsidiary of the Company or limit in any way the right of the Company or any Parent or Subsidiary of the Company to terminate Participant’s employment or other
relationship at any time, with or without Cause. 
  

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 17. CORPORATE TRANSACTIONS. 
 17.1 Assumption or Replacement of Awards by Successor or Acquiring Company. In the event of (i) a dissolution or
liquidation of the Company, (ii) any reorganization, consolidation, merger or similar transaction or series of related transactions (each, a “combination transaction”)) in which the Company is a constituent corporation
or is a party if, as a result of such combination transaction, the voting securities of the Company that are outstanding immediately prior to the consummation of such combination transaction (other than any such securities that are held by an
“Acquiring Stockholder”, as defined below) do not represent, or are not converted into, securities of the surviving corporation of such combination transaction (or such surviving corporation’s parent corporation if the surviving
corporation is owned by the parent corporation) that, immediately after the consummation of such combination transaction, together possess at least a majority of the total voting power of all securities of such surviving corporation (or its parent
corporation, if applicable) that are outstanding immediately after the consummation of such combination transaction, including securities of such surviving corporation (or its parent corporation, if applicable) that are held by the Acquiring
Stockholder; or (b) a sale of all or substantially all of the assets of the Company, that is followed by the distribution of the proceeds to the Company’s stockholders, any or all outstanding Awards may be assumed, converted or replaced by
the successor or acquiring corporation (if any), which assumption, conversion or replacement will be binding on all Participants. In the alternative, the successor or acquiring corporation may substitute equivalent Awards or provide substantially
similar consideration to Participants as was provided to stockholders of the Company (after taking into account the existing provisions of the Awards). The successor or acquiring corporation may also substitute by issuing, in place of outstanding
Shares of the Company held by the Participant, substantially similar shares or other property subject to repurchase restrictions and other provisions no less favorable to the Participant than those which applied to such outstanding Shares
immediately prior to such transaction described in this Section 1717.1. For purposes of this Section 17.1, an “Acquiring Stockholder” means a stockholder or stockholders of the Company that (i) merges or
combines with the Company in such combination transaction or (ii) owns or controls a majority of another corporation that merges or combines with the Corporation in such combination transaction. In the event such successor or acquiring
corporation (if any) does not assume, convert, replace or substitute Awards, as provided above, pursuant to a transaction described in this Section 1717.1, then notwithstanding any other provision in this Plan to the contrary, the vesting of
such Awards will accelerate and the Options will become exercisable in full prior to the consummation of such event at such times and on such conditions as the Committee determines, and if such Options are not exercised prior to the consummation of
the corporate transaction, they shall terminate in accordance with the provisions of this Plan. 
 17.2 Other Treatment of
Awards. Subject to any greater rights granted to Participants under the foregoing provisions of this Section 17, in the event of the occurrence of any transaction described in Section 17.1 hereof, any outstanding Awards will be
treated as provided in the applicable agreement or plan of reorganization, merger, consolidation, dissolution, liquidation or sale of assets. 
  

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 17.3 Assumption of Awards by the Company. The Company, from time to time, also
may substitute or assume outstanding awards granted by another company, whether in connection with an acquisition of such other company or otherwise, by either (i) granting an Award under this Plan in substitution of such other company’s
award or (ii) assuming such award as if it had been granted under this Plan if the terms of such assumed award could be applied to an Award granted under this Plan. Such substitution or assumption will be permissible if the holder of the
substituted or assumed award would have been eligible to be granted an Award under this Plan if the other company had applied the rules of this Plan to such grant. In the event the Company assumes an award granted by another company, the terms and
conditions of such award will remain unchanged (except that the exercise price and the number and nature of shares issuable upon exercise of any such option will be adjusted appropriately pursuant to Section 424(a) of the Code). In the event
the Company elects to grant a new Option rather than assuming an existing option, such new Option may be granted with a similarly adjusted Exercise Price. 
 18. ADOPTION AND STOCKHOLDER APPROVAL. This Plan will become effective on the date that it is adopted by the Board (the “Effective Date”). This Plan
will be approved by the stockholders of the Company (excluding Shares issued pursuant to this Plan), consistent with applicable laws, within twelve (12) months before or after the Effective Date. Upon the Effective Date, the Board may grant
Awards pursuant to this Plan; provided, however, that: (i) no Option may be exercised prior to initial stockholder approval of this Plan; (ii) no Option granted pursuant to an increase in the number of Shares approved by the Board shall be
exercised prior to the time such increase has been approved by the stockholders of the Company; (iii) in the event that initial stockholder approval is not obtained within the time period provided herein, all Awards granted hereunder shall be
canceled, any Shares issued pursuant to any Award shall be canceled and any purchase of Shares issued hereunder shall be rescinded; and (iv) Awards granted pursuant to an increase in the number of Shares approved by the Board which increase is
not timely approved by stockholders shall be canceled, any Shares issued pursuant to any such Awards shall be canceled, and any purchase of Shares subject to any such Award shall be rescinded. 
 19. TERM OF PLAN/GOVERNING LAW. Unless earlier terminated as provided herein, this Plan will terminate ten
(10) years from the Effective Date or, if earlier, the date of stockholder approval. This Plan and all agreements hereunder shall be governed by and construed in accordance with the laws of the State of California. 
 20. AMENDMENT OR TERMINATION OF PLAN. Subject to Section 5.9 hereof, the Board may at any time terminate or amend
this Plan in any respect, including without limitation amendment of any form of Award Agreement or instrument to be executed pursuant to this Plan; provided, however, that the Board will not, without the approval of the stockholders of the Company,
amend this Plan in any manner that requires such stockholder approval pursuant to Section 25102(o) of the California Corporations Code or the Code or the regulations promulgated thereunder as such provisions apply to ISO plans. 
 21. NONEXCLUSIVITY OF THE PLAN. Neither the adoption of this Plan by the Board, the submission of this Plan to
the stockholders of the Company for approval, nor any provision of this Plan will be construed as creating any limitations on the power of the Board to adopt such additional compensation arrangements as it may deem desirable, including, without
limitation, the granting of stock options and other equity awards otherwise than under this Plan, and such arrangements may be either generally applicable or applicable only in specific cases. 
  

 12 

 22. DEFINITIONS. As used in this Plan, the following terms will
have the following meanings: 
 “Award” means any award under this Plan, including any Option or
Restricted Stock Award. 
 “Award Agreement” means, with respect to each Award, the signed written
agreement between the Company and the Participant setting forth the terms and conditions of the Award, including the Stock Option Agreement and Restricted Stock Agreement. 
 “Board” means the Board of Directors of the Company. 
 “Cause” means Termination because of (i) any willful, material violation by the Participant of any law or
regulation applicable to the business of the Company or a Parent or Subsidiary of the Company, the Participant’s conviction for, or guilty plea to, a felony or a crime involving moral turpitude, or any willful perpetration by the Participant of
a common law fraud, (ii) the Participant’s commission of an act of personal dishonesty which involves personal profit in connection with the Company or any other entity having a business relationship with the Company, (iii) any
material breach by the Participant of any provision of any agreement or understanding between the Company or any Parent or Subsidiary of the Company and the Participant regarding the terms of the Participant’s service as an employee, officer,
director or consultant to the Company or a Parent or Subsidiary of the Company, including without limitation, the willful and continued failure or refusal of the Participant to perform the material duties required of such Participant as an employee,
officer, director or consultant of the Company or a Parent or Subsidiary of the Company, other than as a result of having a Disability, or a breach of any applicable invention assignment and confidentiality agreement or similar agreement between the
Company or a Parent or Subsidiary of the Company and the Participant, (iv) Participant’s disregard of the policies of the Company or any Parent or Subsidiary of the Company so as to cause loss, damage or injury to the property, reputation
or employees of the Company or a Parent or Subsidiary of the Company, or (v) any other misconduct by the Participant which is materially injurious to the financial condition or business reputation of, or is otherwise materially injurious to,
the Company or a Parent or Subsidiary of the Company. 
 “Code” means the Internal Revenue Code of 1986,
as amended. 
 “Committee” means the committee created and appointed by the Board to administer this
Plan, or if no committee is created and appointed, the Board. 
 “Company” means Force10 Networks, Inc.,
or any successor corporation. 
 “Disability” means a disability, whether temporary or permanent,
partial or total, as determined by the Committee. 
 “Exercise Price” means the price at which a holder
of an Option may purchase the Shares issuable upon exercise of the Option. 
  

 13 

 “Fair Market Value” means, as of any date, the value of a share of
the Company’s Common Stock determined as follows: 
 (a) if such Common Stock is then quoted on the Nasdaq National
Market, its closing price on the Nasdaq National Market on the date of determination as reported in The Wall Street Journal; 
 (b) if such Common Stock is publicly traded and is then listed on a national securities exchange, its closing price on the date of determination on the principal national securities exchange on which the Common Stock is listed or admitted
to trading as reported in The Wall Street Journal; 
 (c) if such Common Stock is publicly traded but is not quoted on
the Nasdaq National Market nor listed or admitted to trading on a national securities exchange, the average of the closing bid and asked prices on the date of determination as reported by The Wall Street Journal (or, if not so reported, as
otherwise reported by any newspaper or other source as the Board may determine); or 
 (d) if none of the foregoing is
applicable, by the Committee in good faith. 
 “Option” means an award of an option to purchase Shares
pursuant to Section 5 hereof. 
 “Parent” means any corporation (other than the Company) in an
unbroken chain of corporations ending with the Company if each of such corporations other than the Company owns stock representing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other
corporations in such chain. 
 “Participant” means a person who receives an Award under this Plan.

 “Plan” means this Turin Networks, Inc. 2006 Equity Incentive Plan, as amended from time to time.

 “Purchase Price” means the price at which a Participant may purchase Restricted Stock. 
 “Restricted Stock” means Shares purchased pursuant to a Restricted Stock Award. 
 “Restricted Stock Award” means an award of Shares pursuant to Section 6 hereof. 
 “SEC” means the Securities and Exchange Commission. 
 “Securities Act” means the Securities Act of 1933, as amended. 
  

 14 

 “Shares” means shares of the Company’s Common Stock par value,
reserved for issuance under this Plan, as adjusted pursuant to Sections 2 and 17 hereof, and any successor security. 
 “Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations beginning with the Company if each of the corporations other than the last corporation in the unbroken chain owns stock
representing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. 
 “Termination” or “Terminated” means, for purposes of this Plan with respect to a Participant, that the Participant has for any reason ceased to provide
services as an employee, officer, director or consultant to the Company or a Parent or Subsidiary of the Company. A Participant will not be deemed to have ceased to provide services in the case of (i) sick leave, (ii) military leave, or
(iii) any other leave of absence approved by the Committee, provided that such leave is for a period of not more than ninety (90) days (a) unless reinstatement (or, in the case of an employee with an ISO, reemployment) upon the
expiration of such leave is guaranteed by contract or statute, or (b) unless provided otherwise pursuant to formal policy adopted from time to time by the Company’s Board and issued and promulgated in writing. In the case of any
Participant on (i) sick leave, (ii) military leave or (iii) an approved leave of absence, the Committee may make such provisions respecting suspension of vesting of the Award while on leave from the Company or a Parent or Subsidiary
of the Company as it may deem appropriate, except that in no event may an Option be exercised after the expiration of the term set forth in the Stock Option Agreement. The Committee will have sole discretion to determine whether a Participant has
ceased to provide services and the effective date on which the Participant ceased to provide services (the “Termination Date”). 
 “Unvested Shares” means “Unvested Shares” as defined in the Award Agreement. 
 “Vested Shares” means “Vested Shares” as defined in the Award Agreement. 
  

 151999 Stock Plan

 Exhibit 10.3 
 TURIN NETWORKS, INC. 
 1999 STOCK PLAN

 1. Purposes of the Plan. The purposes of this Stock Plan are to attract and retain the best available personnel
for positions of substantial responsibility, to provide additional incentive to Employees, Directors and Consultants and to promote the success of the Company’s business. Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of grant. Stock Purchase Rights may also be granted under the Plan. 
 2. Definitions. As used herein, the following definitions shall apply: 
 (a)
“Administrator” means the Board or any of its Committees as shall be administering the Plan in accordance with Section 4 hereof. 
 (b) “Applicable Laws” means the requirements relating to the administration of stock option plans under U.S. state corporate laws, U.S. federal and state securities laws, the Code, any
stock exchange or quotation system on which the Common Stock is listed or quoted and the applicable laws of any other country or jurisdiction where Options or Stock Purchase Rights are granted under the Plan. 
 (c) “Board” means the Board of Directors of the Company. 
 (d) “Code” means the Internal Revenue Code of 1986, as amended. 
 (e) “Committee” means a committee of Directors appointed by the Board in accordance with Section 4 hereof. 

(f) “Common Stock” means the Common Stock of the Company. 
 (g) “Company” means Turin Networks, Inc. a Delaware corporation. 
 (h) “Consultant” means any person who is engaged by the Company or any Parent or Subsidiary to render consulting or
advisory services to such entity. 
 (i) “Director” means a member of the Board. 
 (j) “Disability” means total and permanent disability as defined in Section 22(e)(3) of the Code. 
 (k) “Employee” means any person, including Officers and Directors, employed by the Company or any Parent or Subsidiary of
the Company. A Service Provider shall not cease to be an Employee in the case of (1) any leave of absence approved by the Company or (ii) transfers between locations of the Company or between the Company, its Parent, any Subsidiary, or any
successor. For purposes of Incentive Stock Options, no such leave may exceed ninety days, unless reemployment upon expiration of such leave is guaranteed by statute or contract. If reemployment upon expiration of a leave of absence approved by the
Company is

 
not so guaranteed, on the 181st day of such leave any Incentive Stock Option held by the Optionee shall cease to be treated as an Incentive Stock Option and shall be treated for tax purposes as a
Nonstatutory Stock Option. Neither service as a Director nor payment of a director’s fee by the Company shall be sufficient to constitute “employment” by the Company. 
 (l) “Exchange Act” means the Securities Exchange Act of 1934, as amended. 
 (m) “Fair Market Value” means, as of any date, the value of Common Stock determined as follows: 
 (i) If the Common Stock is listed on any established stock exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market Value shall be the closing sales price for such stock (or the closing bid, if no sales were reported) as quoted on such exchange or system for the last market
trading day prior to the time of determination, as reported in The Wall Street Journal or such other source as the Administrator deems reliable; 
 (ii) If the Common Stock is regularly quoted by a recognized securities dealer but selling prices are not reported, its Fair Market Value shall be the mean between the high bid and low asked prices for
the Common Stock on the last market trading day prior to the day of determination; or 
 (iii) In the absence of an established
market for the Common Stock, the Fair Market Value thereof shall be determined in good faith by the Administrator. 
 (n)
“Incentive Stock Option” means an Option intended to qualify as an incentive stock option within the meaning of Section 422 of the Code. 
 (o) “Nonstatutory Stock Option” means an Option not intended to qualify as an Incentive Stock Option. 
 (p) “Officer” means a person who is an officer of the Company within the meaning of Section 16 of the Exchange Act and the rules and regulations promulgated thereunder. 

(q) “Option” means a stock option granted pursuant to the Plan. 
 (r) “Option Agreement” means a written or electronic agreement between the Company and an Optionee evidencing the terms and
conditions of an individual Option grant. The Option Agreement is subject to the terms and conditions of the Plan. 
 (s)
“Option Exchange Program” means a program whereby outstanding Options are exchanged for Options with a lower exercise price. 
 (t) “Optioned Stock” means the Common Stock subject to an Option or a Stock Purchase Right. 
  

 2 

 (u) “Optionee” means the holder of an outstanding Option or Stock Purchase
Right granted under the Plan. 
 (v) “Parent” means a “parent corporation,” whether now or hereafter
existing, as defined in Section 424(e) of the Code. 
 (w) “Plan” means this 1999 Stock Plan. 

(x) “Restricted Stock” means shares of Common Stock acquired pursuant to a grant of a Stock Purchase Right under
Section 11 below. 
 (y) “Service Provider” means an Employee, Director or Consultant. 
 (z) “Share” means a share of the Common Stock, as adjusted in accordance with Section 12 below. 
 (aa) “Stock Purchase Right” means a right to purchase Common Stock pursuant to Section 11 below. 
 (bb) “Subsidiary” means a “subsidiary corporation,” whether now or hereafter existing, as defined in
Section 424(f) of the Code. 
 3. Stock Subject to the Plan. Subject to the provisions of Section 12 of the
Plan, the maximum aggregate number of Shares that may be subject to option and sold under the Plan is 6,300,000 Shares. The Shares may be authorized but unissued, or reacquired Common Stock. 
 If an Option or Stock Purchase Right expires or becomes unexercisable without having been exercised in full, or is surrendered pursuant to
an Option Exchange Program, the unpurchased Shares which were subject thereto shall become available for future grant or sale under the Plan (unless the Plan has terminated). However, Shares that have actually been issued under the Plan, upon
exercise of either an Option or Stock Purchase Right, shall not be returned to the Plan and shall not become available for future distribution under the Plan, except that if Shares of Restricted Stock are repurchased by the Company at their original
purchase price, such Shares shall become available for future grant under the Plan. 
 4. Administration of the Plan.

 (a) Administrator. The Plan shall be administered by the Board or a Committee appointed by the Board, which Committee
shall be constituted to comply with Applicable Laws. 
 (b) Powers of the Administrator. Subject to the provisions of the
Plan and, in the case of a Committee, the specific duties delegated by the Board to such Committee, and subject to the approval of any relevant authorities, the Administrator shall have the authority in its discretion: 
 (i) to determine the Fair Market Value; 
  

 3 

 (ii) to select the Service Providers to whom Options and Stock Purchase Rights may from
time to time be granted hereunder; 
 (iii) to determine the number of Shares to be covered by each such award granted
hereunder; 
 (iv) to approve forms of agreement for use under the Plan; 
 (v) to determine the terms and conditions, of any Option or Stock Purchase Right granted hereunder. Such terms and conditions include, but
are not limited to, the exercise price, the time or times when Options or Stock Purchase Rights may be exercised (which may be based on performance criteria), any vesting acceleration or waiver of forfeiture restrictions, and any restriction or
limitation regarding any Option or Stock Purchase Right or the Common Stock relating thereto, based in each case on such factors as the Administrator, in its sole discretion, shall determine; 
 (vi) to determine whether and under what circumstances an Option may be settled in cash under subsection 9(e) instead of Common Stock;

 (vii) to reduce the exercise price of any Option to the then current Fair Market Value if the Fair Market Value of the
Common Stock covered by such Option has declined since the date the Option was granted; 
 (viii) to initiate an Option
Exchange Program; 
 (ix) to prescribe, amend and rescind rules and regulations relating to the Plan, including rules and
regulations relating to sub-plans established for the purpose of qualifying for preferred tax treatment under foreign tax laws; 
 (x) to allow Optionees to satisfy withholding tax obligations by electing to have the Company withhold from the Shares to be issued upon exercise of an Option or Stock Purchase Right that number of Shares having a Fair Market Value equal to
the amount required to be withheld. The Fair Market Value of the Shares to be withheld shall be determined on the date that the amount of tax to be withheld is to be determined. All elections by Optionees to have Shares withheld for this purpose
shall be made in such form and under such conditions as the Administrator may deem necessary or advisable; and 
 (xi) to
construe and interpret the terms of the Plan and awards granted pursuant to the Plan. 
 (c) Effect of Administrator’s
Decision. All decisions, determinations and interpretations of the Administrator shall be final and binding on all Optionees. 
 5. Eligibility. 
 (a) Nonstatutory Stock Options and Stock Purchase Rights may be granted to Service Providers.
Incentive Stock Options may be granted only to Employees. 
  

 4 

 (b) Each Option shall be designated in the Option Agreement as either an Incentive Stock
Option or a Nonstatutory Stock Option. However, notwithstanding such designation, to the extent that the aggregate Fair Market Value of the Shares with respect to which Incentive Stock Options are exercisable for the first time by the Optionee
during any calendar year (under all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such Options shall be treated as Nonstatutory Stock Options. For purposes of this Section 5(b), Incentive Stock Options shall be taken into
account in the order in which they were granted. The Fair Market Value of the Shares shall be determined as of the time the Option with respect to such Shares is granted. 
 (c) Neither the Plan nor any Option or Stock Purchase Right shall confer upon any Optionee any right with respect to continuing the Optionee’s relationship as a Service Provider with the Company, nor
shall it interfere in any way with his or her night or the Company’s right to terminate such relationship at any time, with or without cause. 
 6. Term of Plan. The Plan shall become effective upon its adoption by the Board. It shall continue in effect for a term of ten (10) years unless sooner terminated under Section 14 of the
Plan. 
 7. Term of Option. The term of each Option shall be stated in the Option Agreement; provided, however, that the
term shall be no more than ten (10) years from the date of grant thereof. In the case of an Incentive Stock Option granted to an Optionee who, at the time the Option is granted, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary, the term of the Option shall be five (5) years from the date of grant or such shorter term as may be provided in the Option Agreement. 
 8. Option Exercise Price and Consideration. 
 (a) The per share exercise price for the Shares to be issued upon exercise of an Option shall be such price as is determined by the Administrator, but shall be subject to the following: 
 (i) In the case of an Incentive Stock Option 
 (A) granted to an Employee who, at the time of grant of such Option, owns stock representing more than ten percent (10%) of the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the exercise price shall be no less than I 10% of the Fair Market Value per Share on the date of grant. 
 (B)
granted to any other Employee, the per Share exercise price shall be no less than 100% of the Fair Market Value per Share on the date of grant. 
 (ii) In the case of a Nonstatutory Stock Option 
 (A) granted to a Service
Provider who, at the time of grant of such Option, owns stock representing more than ten percent (10%) of the voting power of all classes of stock of the Company or any Parent or Subsidiary, the exercise price shall be no less than 110% of the
Fair Market Value per Share on the date of grant. 
  

 5 

 (B) granted to any other Service Provider, the per Share exercise price shall be no less
than 85% of the Fair Market Value per Share on the date of grant. 
 (iii) Notwithstanding the foregoing, Options may be
granted with a per Share exercise price other than as required above pursuant to a merger or other corporate transaction. 
 (b)
The consideration to be paid for the Shares to be issued upon exercise of an Option, including the method of payment, shall be determined by the Administrator (and, in the case of an Incentive Stock Option, shall be determined at the time of grant).
Such consideration may consist of (1) cash, (2) check, (3) promissory note, (4) other Shares which (x) in the case of Shares acquired upon exercise of an Option, have been owned by the Optionee for more than six months on
the date of surrender, and (y) have a Fair Market Value on the date of surrender equal to the aggregate exercise price of the Shares as to which such Option shall be exercised, (5) consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan, or (6) any combination of the foregoing methods of payment. In making its determination as to the type of consideration to accept, the Administrator shall consider if
acceptance of such consideration may be reasonably expected to benefit the Company. 
 9. Exercise of Option. 

(a) Procedure for Exercise; Rights as a Shareholder. Any Option granted hereunder shall be exercisable according to the terms hereof at
such times and under such conditions as determined by the Administrator and set forth in the Option Agreement. Except in the case of Options granted to Officers, Directors and Consultants, Options shall become exercisable at a rate of no less than
20% per year over five (5) years from the date the Options are granted. Unless the Administrator provides otherwise, vesting of Options granted hereunder to Officers and Directors shall be tolled during any unpaid leave of absence. An
Option may not be exercised for a fraction of a Share. 
 An Option shall be deemed exercised when the Company receives:
(i) written or electronic notice of exercise (in accordance with the Option Agreement) from the person entitled to exercise the Option, and (ii) full payment for the Shares with respect to which the Option is exercised. Full payment may
consist of any consideration and method of payment authorized by the Administrator and permitted by the Option Agreement and the Plan. Shares issued upon exercise of an Option shall be issued in the name of the Optionee or, if requested by the
Optionee, in the name of the Optionee and his or her spouse. Until the Shares are issued (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no right to vote or receive dividends
or any other rights as a shareholder shall exist with respect to the Shares, notwithstanding the exercise of the Option. The Company shall issue (or cause to be issued) such Shares promptly after the Option is exercised. No adjustment will be made
for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 12 of the Plan. 
  

 6 

 Exercise of an Option in any manner shall result in a decrease in the number of Shares
thereafter available, both for purposes of the Plan and for sale under the Option, by the number of Shares as to which the Option is exercised. 
 (b) Termination of Relationship as a Service Provider. If an Optionee ceases to be a Service Provider, such Optionee may exercise his or her Option within such period of time as is specified in the
Option Agreement (of at least thirty (30) days) to the extent that the Option is vested on the date of termination (but in no event later than the expiration of the term of the Option as set forth in the Option Agreement). In the absence of a
specified time in the Option Agreement, the Option shall remain exercisable for three (3) months following the Optionee’s termination. If, on the date of termination, the Optionee is not vested as to his or her entire Option, the Shares
covered by the unvested portion of the Option shall revert to the Plan. If, after termination, the Optionee does not exercise his or her Option within the time specified by the Administrator, the Option shall terminate, and the Shares covered by
such Option shall revert to the Plan. 
 (c) Disability of Optionee. If an Optionee ceases to be a Service Provider as a
result of the Optionee’s Disability, the Optionee may exercise his or her Option within such period of time as is specified in the Option Agreement (of at least six (6) months) to the extent the Option is vested on the date of termination
(but in no event later than the expiration of the term of such Option as set forth in the Option Agreement). In the absence of a specified time in the Option Agreement, the Option shall remain exercisable for twelve (12) months following the
Optionee’s termination. If, on the date of termination, the Optionee is not vested as to his or her entire Option, the Shares covered by the unvested portion of the Option shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall terminate, and the Shares covered by such Option shall revert to the Plan. 
 (d) Death of Optionee. If an Optionee dies while a Service Provider, the Option may be exercised within such period of time as is specified in the Option Agreement (of at least six (6) months)
to the extent that the Option is vested on the date of death (but in no event later than the expiration of the term of such Option as set forth in the Option Agreement) by the Optionee’s estate or by a person who acquires the right to exercise
the Option by bequest or inheritance. In the absence of a specified time in the Option Agreement, the Option shall remain exercisable for twelve (12) months following the Optionee’s termination. If, at the time of death, the Optionee is
not vested as to the entire Option, the Shares covered by the unvested portion of the Option shall immediately revert to the Plan. If the Option is not so exercised within the time specified herein, the Option shall terminate, and the Shares covered
by such Option shall revert to the Plan. 
 (e) Buyout Provisions. The Administrator may at any time offer to buy out for
a payment in cash or Shares, an Option previously granted, based on such terms and conditions as the Administrator shall establish and communicate to the Optionee at the time that such offer is made. 
 10. Non-Transferability of Options and Stock Purchase Right. The Options and Stock Purchase Rights may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by will or by the laws of descent or distribution and may be exercised, during the lifetime of the Optionee, only by the Optionee. 
  

 7 

 11. Stock Purchase Rights. 
 (a) Rights to Purchase. Stock Purchase Rights may be issued either alone, in addition to, or in tandem with other awards granted under
the Plan and/or cash awards made outside of the Plan. After the Administrator determines that it will offer Stock Purchase Rights under the Plan, it shall advise the offeree in writing or electronically of the terms, conditions and restrictions
related to the offer, including the number of Shares that such person shall be entitled to purchase, the price to be paid, and the time within which such person must accept such offer. The terms of the offer shall comply in all respects with
Section 260.140.42 of Title 10 of the California Code of Regulations. The offer shall be accepted by execution of a Restricted Stock purchase agreement in the form determined by the Administrator. 
 (b) Repurchase Option. Unless the Administrator determines otherwise, the Restricted Stock purchase agreement shall grant the Company
a repurchase option exercisable upon the voluntary or involuntary termination of the purchaser’s service with the Company for any reason (including death or disability). The purchase price for Shares repurchased pursuant to the Restricted Stock
purchase agreement shall be the original price paid by the purchaser and may be paid by cancellation of any indebtedness of the purchaser to the Company. The repurchase option shall lapse at such rate as the Administrator may determine. Except with
respect to Shares purchased by Officers, Directors and Consultants, the repurchase option shall in no case lapse at a rate of less than 20% per year over five (5) years from the date of purchase. 
 (c) Other Provisions. The Restricted Stock purchase agreement shall contain such other terms, provisions and conditions not
inconsistent with the Plan as may be determined by the Administrator in its sole discretion. 
 (d) Rights as a
Shareholder. Once the Stock Purchase Right is exercised, the purchaser shall have rights equivalent to those of a shareholder and shall be a shareholder when his or her purchase is entered upon the records of the duly authorized transfer agent
of the Company. No adjustment shall be made for a dividend or other night for which the record date is prior to the date the Stock Purchase Right is exercised, except as provided in Section 12 of the Plan. 
 12. Adjustments Upon Changes in Capitalization, Merger or Asset Sale. 
 (a) Changes in Capitalization. Subject to any required action by the shareholders of the Company, the number of shares of Common Stock
covered by each outstanding Option or Stock Purchase Right, and the number of shares of Common Stock which have been authorized for issuance under the Plan but as to which no Options or Stock Purchase Rights have yet been granted or which have been
returned to the Plan upon cancellation or expiration of an Option or Stock Purchase Right, as well as the price per share of Common Stock covered by each such outstanding Option or Stock Purchase Right, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting from a stock split, reverse stock split, stock dividend, combination or reclassification of the

  

 8 

 
Common Stock, or any other increase or decrease in the number of issued shares of Common Stock effected without receipt of consideration by the Company. The conversion of any convertible
securities of the Company shall not be deemed to have been “effected without receipt of consideration.” Such adjustment shall be made by the Board, whose determination in that respect shall be final, binding and conclusive. Except as
expressly provided herein, no issuance by the Company of shares of stock of any class, or securities convertible into shares of stock of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an Option or Stock Purchase Right. 
 (b) Dissolution or Liquidation. In the event
of the proposed dissolution or liquidation of the Company, the Administrator shall notify each Optionee as soon as practicable prior to the effective date of such proposed transaction. The Administrator in its discretion may provide for an Optionee
to have the right to exercise his or her Option or Stock Purchase Right until fifteen (15) days prior to such transaction as to all of the Optioned Stock covered thereby, including Shares as to which the Option or Stock Purchase Right would not
otherwise be exercisable. In addition, the Administrator may provide that any Company repurchase option applicable to any Shares purchased upon exercise of an Option or Stock Purchase Right shall lapse as to all such Shares, provided the proposed
dissolution or liquidation takes place at the time and in the manner contemplated. To the extent it has not been previously exercised, an Option or Stock Purchase Right will terminate immediately prior to the consummation of such proposed action.

 (c) Merger or Asset Sale. In the event of a merger of the Company with or into another corporation, or the sale of
substantially all of the assets of the Company, each outstanding Option and Stock Purchase Right shall be assumed or an equivalent option or right substituted by the successor corporation or a Parent or Subsidiary of the successor corporation. In
the event that the successor corporation refuses to assume or substitute for the Option or Stock Purchase Right, the Optionee shall fully vest in and have the right to exercise the Option or Stock Purchase Right as to all of the Optioned Stock,
including Shares as to which it would not otherwise be vested or exercisable. If an Option or Stock Purchase Right becomes fully vested and exercisable in lieu of assumption or substitution in the event of a merger or sale of assets, the
Administrator shall notify the Optionee in writing or electronically that the Option or Stock Purchase Right shall be fully exercisable for a period of fifteen (15) days from the date of such notice, and the Option or Stock Purchase Right shall
terminate upon the expiration of such period. For the purposes of this paragraph, the Option or Stock Purchase Right shall be considered assumed if, following the merger or sale of assets, the option or right confers the right to purchase or
receive, for each Share of Optioned Stock subject to the Option or Stock Purchase Right immediately prior to the merger or sale of assets, the consideration (whether stock, cash, or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the effective date of the transaction (and if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of assets is not solely common stock of the successor corporation or its Parent, the Administrator may, with the consent of the successor corporation, provide for the
consideration to be received upon the exercise of the Option or Stock Purchase Right, for each Share of Optioned Stock subject to the Option or Stock Purchase Right, to be solely common stock of the successor corporation or its Parent equal in fair
market value to the per share consideration received by holders of Common Stock in the merger or sale of assets. 
  

 9 

 13. Time of Granting Options and Stock Purchase Rights. The date of grant of an
Option or Stock Purchase Right shall, for all purposes, be the date on which the Administrator makes the determination granting such Option or Stock Purchase Right, or such other date as is determined by the Administrator. Notice of the
determination shall be given to each Service Provider to whom an Option or Stock Purchase Right is so granted within a reasonable time after the date of such grant. 
 14. Amendment and Termination of the Plan. 
 (a) Amendment and
Termination. The Board may at any time amend, alter, suspend or terminate the Plan. 
 (b) Shareholder Approval. The
Board shall obtain shareholder approval of any Plan amendment to the extent necessary and desirable to comply with Applicable Laws. 
 (c) Effect of Amendment or Termination. No amendment, alteration, suspension or termination of the Plan shall impair the rights of any Optionee, unless mutually agreed otherwise between the Optionee and the Administrator, which
agreement must be in writing and signed by the Optionee and the Company. Termination of the Plan shall not affect the Administrator’s ability to exercise the powers granted to it hereunder with respect to Options granted under the Plan prior to
the date of such termination. 
 15. Conditions Upon Issuance of Shares. 
 (a) Legal Compliance. Shares shall not be issued pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares shall comply with Applicable Laws and shall be further subject to the approval of counsel for the Company with respect to such compliance. 
 (b) Investment Representations. As a condition to the exercise of an Option, the Administrator may require the person exercising such
Option to represent and warrant at the time of any such exercise that the Shares are being purchased only for investment and without any present intention to sell or distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required. 
 16. Inability to Obtain Authority. The inability of the Company to obtain authority from
any regulatory body having jurisdiction, which authority is deemed by the Company’s counsel to be necessary to the lawful issuance and sale of any Shares hereunder, shall relieve the Company of any liability in respect of the failure to issue
or sell such Shares as to which such requisite authority shall not have been obtained. 
 17. Reservation of Shares. The
Company, during the term of this Plan, shall at all times reserve and keep available such number of Shares as shall be sufficient to satisfy the requirements of the Plan. 
  

 10 

 18. Shareholder Approval. The Plan shall be subject to approval by the shareholders
of the Company within twelve (12) months after the date the Plan is adopted. Such shareholder approval shall be obtained in the degree and manner required under Applicable Laws. 
 19. Information to Optionees and Purchasers. The Company shall provide to each Optionee and to each individual who acquires Shares
pursuant to the Plan, not less frequently than annually during the period such Optionee or purchaser has one or more Options or Stock Purchase Rights outstanding, and, in the case of an individual who acquires Shares pursuant to the Plan, during the
period such individual owns such Shares, copies of annual financial statements. The Company shall not be required to provide such statements to key employees whose duties in connection with the Company assure their access to equivalent information.

  

 11 

 TURIN NETWORKS, INC. 
 1999 STOCK PLAN 
 STOCK OPTION AGREEMENT

 Unless otherwise defined herein; the terms defined in the 1999 Stock Plan shall have the same defined meanings in this Stock Option Agreement. 

 

	 	I.	NOTICE OF STOCK OPTION GRANT 

 «Name» 
 «Address» 
 The undersigned Optionee has been granted an Option to purchase Common Stock of the Company, subject to the terms and conditions of the Plan
and this Option Agreement, as follows: 
  

			
	Date of Grant	  	«Date_of_Grant»
		
	Vesting Commencement Date	  	«Vesting_Date»
		
	Exercise Price per Share	  	$«Exercise_Price_per_Share»
		
	Total Number of Shares Granted	  	«Total_Shares»
		
	Total Exercise Price	  	$«Total_Price»
		
	Type of Option:	  	              Incentive Stock Option
		
		  	              Nonstatutory Stock Option
		
	Term/Expiration Date:	  	«Expiration»

 Vesting
Schedule: 
 This Option shall be exercisable, in whole or in part, according to the following vesting schedule: 

25% of the Shares subject to the Option shall vest twelve months after the Vesting Commencement Date, and 1/48 of the Shares subject to
the Option shall vest each month thereafter, subject to Optionee’s continuing to be a Service Provider on such dates. 
 Termination Period: 
 This Option shall be exercisable for three months after Optionee ceases to be a Service
Provider. Upon Optionee’s death or Disability, this Option may be exercised for one year after Optionee ceases to be a Service Provider. In no event may Optionee exercise this Option after the Term/Expiration Date as provided above. 

	 	II.	AGREEMENT 

 1.        Grant of Option. The Plan Administrator of the Company hereby grants to the Optionee named in the Notice of Grant (the “Optionee”), an option (the “Option”) to
purchase the number of Shares set forth in the Notice of Grant, at the exercise price per Share set forth in the Notice of Grant (the “Exercise Price”), and subject to the terms and conditions of the Plan, which is incorporated herein by
reference. Subject to Section 14(c) of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan shall prevail. 
 If designated in the Notice of Grant as an Incentive Stock Option (“ISO”), this Option is intended to qualify as an Incentive
Stock Option as defined in Section 422 of the Code. Nevertheless, to the extent that it exceeds the $100,000 rule of Code Section 422(d), this Option shall be treated as a Nonstatutory Stock Option (“NSO”). 
 2.        Exercise of Option. 
 (a)        Right to Exercise. This Option shall be exercisable during its term in accordance
with the Vesting Schedule set out in the Notice of Grant and with the applicable provisions of the Plan and this Option Agreement. 
 (b)        Method of Exercise. This Option shall be exercisable by delivery of an exercise notice in the form attached as Exhibit A (the “Exercise Notice”) which shall state
the election to exercise the Option, the number of Shares with respect to which the Option is being exercised, and such other representations and agreements as may be required by the Company. The Exercise Notice shall be accompanied by payment of
the aggregate Exercise Price as to all Exercised Shares. This Option shall be deemed to be exercised upon receipt by the Company of such fully executed Exercise Notice accompanied by the aggregate Exercise Price. 
 No Shares shall be issued pursuant to the exercise of an Option unless such issuance and such exercise complies with Applicable Laws.
Assuming such compliance, for income tax purposes the Shares shall be considered transferred to the Optionee on the date on which the Option is exercised with respect to such Shares. 
 3.        Optionee’s Representations. In the event the Shares have not been registered
under the Securities Act of 1933, as amended, at the time this Option is exercised, the Optionee shall, if required by the Company, concurrently with the exercise of all or any portion of this Option, deliver to the Company his or her Investment
Representation Statement in the form attached hereto as Exhibit B and shall read the applicable rules of the Commissioner of Corporations attached to such Investment Representation Statement. 
 4.        Lock-Up Period. Optionee and its assigns hereby agrees not to sell make short sale
of, loan, grant any options for the purchase of or otherwise transfer any Shares or other securities of the Company in connection with the offer, sale or registration of any of the Company’s securities under the Securities Act during the
180-day period (or in the case of

  

 2 

 
subsequent secondary offering during the 90-day period) (or such other period as may be requested in writing by the underwriters and agreed to in writing by the Company) (the “Market
Standoff Period”) following the effective date of a registration statement of the Company filed under the Securities Act. Optionee and its assigns, if any, further agrees to execute any agreement reflecting the foregoing as may be requested by
the underwriters at the time of such public offering. The Company may impose stop-transfer instructions with respect to securities subject to the foregoing restrictions until the end of such Market Standoff Period. 
 5.        Method of Payment. Payment of the aggregate Exercise Price shall be by any of the
following, or a combination thereof, at the election of the Optionee: 
 (a)        cash or check; 
 (b)        consideration received by the Company under a formal cashless exercise program adopted by the Company in connection with the Plan; or 
 (c)        surrender of other Shares which, (i) in the case of Shares acquired upon exercise
of an option, have been owned by the Optionee for more than six (6) months on the date of surrender, and (ii) have a Fair Market Value on the date of surrender equal to the aggregate Exercise Price of the Exercised Shares. 
 6.        Restrictions on Exercise. This Option may not be exercised until such time as the
Plan has been approved by the shareholders of the Company, or if the issuance of such Shares upon such exercise or the method of payment of consideration for such shares would constitute a violation of any Applicable Law. 
 7.        Non-Transferability of Option. This Option may not be transferred in any manner
otherwise than by will or by the laws of descent or distribution and may be exercised during the lifetime of Optionee only by Optionee. The terms of the Plan and this Option Agreement shall be binding upon the executors, administrators, heirs,
successors and assigns of the Optionee. 
 8.        Term of Option. This Option
may be exercised only within the term set out in the Notice of Grant, and may be exercised during such term only in accordance with the Plan and the terms of this Option. 
 9.        Tax Consequences. Set forth below is a brief summary as of the date of this Option
of some of the federal tax consequences of exercise of this Option and disposition of the Shares. THIS SUMMARY IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE
EXERCISING THIS OPTION OR DISPOSING OF THE SHARES. 
 (a)        Exercise of
NSO. There may be a regular federal income tax liability upon the exercise of an NSO. The Optionee will be treated as having received compensation income (taxable at ordinary income tax rates) equal to the excess, if any, of the Fair Market
Value of the Shares on the date of exercise over the Exercise Price. If Optionee is an Employee or a former Employee, the Company will be required to withhold from Optionee’s

  

 3 

 
compensation or collect from Optionee and pay to the applicable taxing authorities an amount in cash equal to a percentage of this compensation income at the time of exercise, and may refuse to
honor the exercise and refuse to deliver Shares if such withholding amounts are not delivered at the time of exercise. 
 (b)        Exercise of ISO. If this Option qualifies as an ISO, there will be no regular federal income tax liability upon the exercise of the Option, although the excess, if any, of the Fair
Market Value of the Shares on the date of exercise over the Exercise Price will be treated as an adjustment to the alternative minimum tax for federal tax purposes and may subject the Optionee to the alternative minimum tax in the year of exercise.

 (c)        Disposition of Shares. In the case of an NSO, if Shares are held
for at least one year, any gain realized on disposition of the Shares will be treated as long-term capital gain for federal income tax purposes. In the case of an ISO, if Shares transferred pursuant to the Option are held for at least one year after
exercise and of at least two years after the Date of Grant, any gain realized on disposition of the Shares will also be treated as long-term capital gain for federal income tax purposes. If Shares purchased under an ISO are disposed of within one
year after exercise or two years after the Date of Grant, any gain realized on such disposition will be treated as compensation income (taxable at ordinary income rates) to the extent of the difference between the Exercise Price and the lesser of
(1) the Fair Market Value of the Shares on the date of exercise, or (2) the sale price of the Shares. Any additional gain will be taxed as capital gain, short-term or long-term depending on the period that the ISO Shares were held.

 (d)        Notice of Disqualifying Disposition of ISO Shares. If the Option
granted to Optionee herein is an ISO, and if Optionee sells or otherwise disposes of any of the Shares acquired pursuant to the ISO on or before the later of (1) the date two years after the Date of Grant, or (2) the date one year after
the date of exercise, the Optionee shall immediately notify the Company in writing of such disposition. Optionee agrees that Optionee may be subject to income tax withholding by the Company on the compensation income recognized by the Optionee.

 10.        Entire Agreement; Governing Law. The Plan is incorporated herein
by reference. The Plan and this Option Agreement constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their entirety all prior undertakings and agreements of the Company and Optionee with respect
to the subject matter hereof, and may not be modified adversely to the Optionee’s interest except by means of a writing signed by the Company and Optionee. This agreement is governed by the internal substantive laws but not the choice of law
rules of California. 
 11.        No Guarantee of Continued Service. OPTIONEE
ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED THIS OPTION OR ACQUIRING
SHARES HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET

  

 4 

 
FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE IN ANY WAY
WITH OPTIONEE’S RIGHT OR THE COMPANY’S RIGHT TO TERMINATE OPTIONEE’S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE. 
 Optionee acknowledges receipt of a copy of the Plan and represents that he or she is familiar with the terms and provisions thereof, and hereby accepts this Option subject to all of the terms and
provisions thereof. Optionee has reviewed the Plan and this Option in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Option and fully understands all provisions of the Option. Optionee hereby agrees to
accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan or this Option. Optionee further agrees to notify the Company upon any change in the residence address indicated
below. 
  

					
	OPTIONEE	 		 	TURIN NETWORKS, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

	«Name»	 		 	Title

 Residence Address: 
 «Address» 
  

 5 

 EXHIBIT A 
 1999 STOCK PLAN 
 EXERCISE NOTICE 
 Turin Networks, Inc. 
 1415 North McDowell
Boulevard 
 Petaluma, California 94954 
 Attention: Chief Financial Officer 
 1.        Exercise of Option.
Effective as of today,            , 19    , the undersigned (“Optionee”) hereby elects to exercise Optionee’s option to purchase
             shares of the Common Stock (the “Shares”) of Turin Networks, Inc. (the “Company”) under and pursuant to the 1999 Stock Plan (the “Plan”) and the
Stock Option Agreement dated             , 19     (the “Option Agreement”). 
 2.        Delivery of Payment. Purchaser herewith delivers to the Company the full purchase price of the Shares, as set forth in the Option Agreement.

 3.        Representations of Optionee. Optionee acknowledges that Optionee has
received, read and understood the Plan and the Option Agreement and agrees to abide by and be bound by their terms and conditions. 
 4.        Rights as Shareholder. Until the issuance of the Shares (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no
right to vote or receive dividends or any other rights as a shareholder shall exist with respect to the Optioned Stock, notwithstanding the exercise of the Option. The Shares shall be issued to the Optionee as soon as practicable after the Option is
exercised. No adjustment shall be made for a dividend or other right for which the record date is prior to the date of issuance except as provided in Section 12 of the Plan. 
 5.        Company’s Right of First Refusal. Before any Shares held by Optionee or any
transferee (either being sometimes referred to herein as the “Holder”) may be sold or otherwise transferred (including transfer by gift or operation of law), the Company or its assignee(s) shall have a right of first refusal to purchase
the Shares on the terms and conditions set forth in this Section (the “Right of First Refusal”). 
 (a)        Notice of Proposed Transfer. The Holder of the Shares shall deliver to the Company a written notice (the “Notice”) stating: (i) the Holder’s bona fide intention
to sell or otherwise transfer such Shares; (ii) the name of each proposed purchaser or other transferee (“Proposed Transferee”); (iii) the number of Shares to be transferred to each Proposed Transferee; and (iv) the bona
fide cash price or other consideration for which the Holder proposes to transfer the Shares (the “Offered Price”), and the Holder shall offer the Shares at the Offered Price to the Company or its assignee(s). 
 (b)        Exercise of Right of First Refusal. At any time within thirty (30) days
after receipt of the Notice, the Company and/or its assignee(s) may, by giving written notice to the Holder,

 
elect to purchase all, but not less than all, of the Shares proposed to be transferred to any one or more of the Proposed Transferees, at the purchase price determined in accordance with
subsection (c) below. 
 (c)        Purchase Price. The purchase price
(“Purchase Price”) for the Shares purchased by the Company or its assignee(s) under this Section shall be the Offered Price. If the Offered Price includes consideration other than cash, the cash equivalent value of the non-cash
consideration shall be determined by the Board of Directors of the Company in good faith. 
 (d)        Payment. Payment of the Purchase Price shall be made, at the option of the Company or its assignee(s), in cash (by check), by cancellation of all or a portion of any outstanding
indebtedness of the Holder to the Company (or, in the case of repurchase by an assignee, to the assignee), or by any combination thereof within thirty (30) days after receipt of the Notice or in the manner and at the times set forth in the
Notice. 
 (e)        Holder’s Right to Transfer. If all of the Shares
proposed in the Notice to be transferred to a given Proposed Transferee are not purchased by the Company and/or its assignee(s) as provided in this Section, then the Holder may sell or otherwise transfer such Shares to that Proposed Transferee at
the Offered Price or at a higher price, provided that such sale or other transfer is consummated within 120 days after the date of the Notice, that any such sale or other transfer is effected in accordance with any applicable securities laws and
that the Proposed Transferee agrees in writing that the provisions of this Section shall continue to apply to the Shares in the hands of such Proposed Transferee. If the Shares described in the Notice are not transferred to the Proposed Transferee
within such period, a new Notice shall be given to the Company, and the Company and/or its assignees shall again be offered the Right of First Refusal before any Shares held by the Holder may be sold or otherwise transferred. 
 (f)        Exception for Certain Family Transfers. Anything to the contrary contained in
this Section notwithstanding, the transfer of any or all of the Shares during the Optionee’s lifetime or on the Optionee’s death by will or intestacy to the Optionee’s immediate family or a trust for the benefit of the Optionee’s
immediate family shall be exempt from the provisions of this Section. “Immediate Family” as used herein shall mean spouse, lineal descendant or antecedent, father, mother, brother or sister. In such case, the transferee or other recipient
shall receive and hold the Shares so transferred subject to the provisions of this Section, and there shall be no further transfer of such Shares except in accordance with the terms of this Section. 
 (g)        Termination of Right of First Refusal. The Right of First Refusal shall terminate
as to any Shares upon the first sale of Common Stock of the Company to the general public pursuant to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act of 1933, as amended.

 6.        Tax Consultation. Optionee understands that Optionee may suffer
adverse tax consequences as a result of Optionee’s purchase or disposition of the Shares. Optionee represents that Optionee has consulted with any tax consultants Optionee deems advisable in connection with the purchase or disposition of the
Shares and that Optionee is not relying on the Company for any tax advice. 
  

 2 

 7.        Restrictive Legends and Stop-Transfer
Orders. 
 (a)        Legends. Optionee understands and agrees that the
Company shall cause the legends set forth below or legends substantially equivalent thereto, to be placed upon any certificate(s) evidencing ownership of the Shares together with any other legends that may be required by the Company or by state or
federal securities laws: 
 THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE
“ACT”) AND MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL REGISTERED UNDER THE ACT OR, IN THE OPINION OF COMPANY COUNSEL SATISFACTORY TO THE ISSUER OF THESE SECURITIES, SUCH OFFER, SALE OR
TRANSFER, PLEDGE OR HYPOTHECATION IS IN COMPLIANCE THEREWITH. 
 THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
CERTAIN RESTRICTIONS ON TRANSFER AND A RIGHT OF FIRST REFUSAL HELD BY THE ISSUER OR ITS ASSIGNEE(S) AS SET FORTH IN THE EXERCISE NOTICE BETWEEN THE ISSUER AND THE ORIGINAL HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL
OFFICE OF THE ISSUER. SUCH TRANSFER RESTRICTIONS AND RIGHT OF FIRST REFUSAL ARE BINDING ON TRANSFEREES OF THESE SHARES. 
 IT
IS UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR ANY INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA, EXCEPT AS PERMITTED
IN THE COMMISSIONER’S RULES. 
 Optionee understands that transfer of the Shares may be restricted by
Section 260.141.11 of the Rules of the California Corporations Commissioner, a copy of which is attached to Exhibit B, the Investment Representation Statement. 
 (b)        Stop-Transfer Notices. Optionee agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue
appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 
 (c)        Refusal to Transfer. The Company shall not be required (i) to transfer on
its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Exercise Notice or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or other
transferee to whom such Shares shall have been so transferred. 
  

 3 

 8.        Successors and Assigns. The Company
may assign any of its rights under this Exercise Notice to single or multiple assignees, and this Exercise Notice shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, this
Exercise Notice shall be binding upon Optionee and his or her heirs, executors, administrators, successors and assigns. 
 9.        Interpretation. Any dispute regarding the interpretation of this Exercise Notice shall be submitted by Optionee or by the Company forthwith to the Administrator which shall review
such dispute at its next regular meeting. The resolution of such a dispute by the Administrator shall be final and binding on all parties. 
 10.        Governing Law: Severability. This Exercise Notice is governed by the internal substantive laws but not the choice of law rules, of California.

 11.        Entire Agreement. The Plan and Option Agreement are incorporated
herein by reference. This Exercise Notice, the Plan, the Option Agreement and the Investment Representation Statement constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their entirety all prior
undertakings and agreements of the Company and Optionee with respect to the subject matter hereof, and may not be modified adversely to the Optionee’s interest except by means of a writing signed by the Company and Optionee. 
  

					
	Submitted by:	 		 	Accepted by:
			
	OPTIONEE	 		 	TURIN NETWORKS, INC.
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

	«Name»	 		 	Title
			
	Address:	 		 	Address:
			
	 «Address»
	 		 	 «Address»

			
		 		 	  

		 		 	Date Received

  

 4 

 EXHIBIT B 
 INVESTMENT REPRESENTATION STATEMENT 
  

			
	OPTIONEE:	  	«Name»
		
	COMPANY:	  	TURIN NETWORKS, INC.
		
	SECURITY:	  	COMMON STOCK
		
	AMOUNT:	  	
		
	DATE:	  	

 In connection with the purchase of the above-listed Securities, the undersigned Optionee
represents to the Company the following: 
 (a)        Optionee is aware of the
Company’s business affairs and financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to acquire the Securities. Optionee is acquiring these Securities for investment for
Optionee’s own account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). 
 (b)        Optionee acknowledges and understands that the Securities constitute “restricted
securities” under the Securities Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of Optionee’s investment
intent as expressed herein. In this connection, Optionee understands that, in the view of the Securities and Exchange Commission, the statutory basis for such exemption may be unavailable if Optionee’s representation was predicated solely upon
a present intention to hold these Securities for the minimum capital gains period specified under tax statutes, for a deferred sale, for or until an increase or decrease in the market price of the Securities, or for a period of one year or any other
fixed period in the future. Optionee further understands that the Securities must be held indefinitely unless they are subsequently registered under the Securities Act or an exemption from such registration is available. Optionee further
acknowledges and understands that the Company is under no obligation to register the Securities. Optionee understands that the certificate evidencing the Securities will be imprinted with a legend which prohibits the transfer of the Securities
unless they are registered or such registration is not required in the opinion of counsel satisfactory to the Company, a legend prohibiting their transfer without the consent of the Commissioner of Corporations of the State of California and any
other legend required under applicable state securities laws. 
 (c)        Optionee is
familiar with the provisions of Rule 701 and Rule 144, each promulgated under the Securities Act, which, in substance, permit limited public resale of “restricted securities” acquired, directly or indirectly from the issuer thereof, in a
non-public offering subject to the satisfaction of certain conditions. Rule 701 provides that if the issuer qualifies under Rule 701 at the time of the grant of the Option to the Optionee, the exercise will be exempt

 
from registration under the Securities Act. In the event the Company becomes subject to the reporting requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, ninety
(90) days thereafter (or such longer period as any market stand-off agreement may require) the Securities exempt under Rule 701 may be resold, subject to the satisfaction of certain of the conditions specified by Rule 144, including:
(1) the resale being made through a broker in an unsolicited “broker’s transaction” or in transactions directly with a market maker (as said term is defined under the Securities Exchange Act of 1934); and, in the case of an
affiliate, (2) the availability of certain public information about the Company, (3) the amount of Securities being sold during any three month period not exceeding the limitations specified in Rule 144(e), and (4) the timely filing
of a Form 144, if applicable. 
 In the event that the Company does not qualify under Rule 701 at the time of grant of the
Option, then the Securities may be resold in certain limited circumstances subject to the provisions of Rule 144, which requires the resale to occur not less than one year after the later of the date the Securities were sold by the Company or the
date the Securities were sold by an affiliate of the Company, within the meaning of Rule 144; and, in the case of acquisition of the Securities by an affiliate, or by a non-affiliate who subsequently holds the Securities less than two years, the
satisfaction of the conditions set forth in sections (1), (2), (3) and (4) of the paragraph immediately above. 
 (d)        Optionee further understands that in the event all of the applicable requirements of Rule 701 or 144 are not satisfied, registration under the Securities Act, compliance with Regulation A,
or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the Staff of the Securities and Exchange Commission has expressed its opinion that persons proposing to sell private
placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden of proof in establishing that an exemption from registration is available for such offers or sales, and that such
persons and their respective brokers who participate in such transactions do so at their own risk. Optionee understands that no assurances can be given that any such other registration exemption will be available in such event. 
 (e)        Optionee understands that the certificate evidencing the Securities will be imprinted
with a legend which prohibits the transfer of the Securities without the consent of the Commissioner of Corporations of California. Optionee has read the applicable Commissioner’s Rules with respect to such restriction, a copy of which is
attached. 
  

					
	Signature of Optionee:
	
	  

			
	Date:	 	  
	 	, 19    

  

 2 

 ATTACHMENT 1 
 STATE OF CALIFORNIA - CALIFORNIA ADMINISTRATIVE CODE 
 Title 10. Investment - Chapter 3. Commissioner of Corporations 
 260.141.11: Restriction on Transfer.

 (a)        The issuer of any security upon which a restriction on transfer has been
imposed pursuant to Sections 260.102.6, 260.141.10 or 260.534 shall cause a copy of this section to be delivered to each issuee or transferee of such security at the time the certificate evidencing the security is delivered to the issuee or
transferee. 
 (b)        It is unlawful for the holder of any such security to
consummate a sale or transfer of such security, or any interest therein, without the prior written consent of the Commissioner (until this condition is removed pursuant to Section 260.141.12 of these rules), except: 
 (1)        to the issuer; 
 (2)        pursuant to the order or process of any court; 
 (3)        to any person described in Subdivision (i) of Section 25102 of the Code or
Section 260.105.14 of these rules; 
 (4)        to the transferor’s
ancestors, descendants or spouse, or any custodian or trustee for the account of the transferor or the transferor’s ancestors, descendants, or spouse; or to a transferee by a trustee or custodian for the account of the transferee or the
transferee’s ancestors, descendants or spouse; 
 (5)        to holders of
securities of the same class of the same issuer; 
 (6)        by way of gift or
donation inter vivos or on death; 
 (7)        by or through a broker-dealer licensed
under the Code (either acting as such or as a finder) to a resident of a foreign state, territory or country who is neither domiciled in this state to the knowledge of the broker-dealer, nor actually present in this state if the sale of such
securities is not in violation of any securities law of the foreign state, territory or country concerned; 
 (8)        to a broker-dealer licensed under the Code in a principal transaction, or as an underwriter or member of an underwriting syndicate or selling group; 
 (9)        if the interest sold or transferred is a pledge or other lien given by the purchaser to
the seller upon a sale of the security for which the Commissioner’s written consent is obtained or under this rule not required; 
 (10)        by way of a sale qualified under Sections 25111, 25112, 25113 or 25121 of the Code, of the securities to be transferred, provided that no order under Section 25140 or subdivision
(a) of Section 25143 is in effect with respect to such qualification; 

 (11)        by a corporation to a wholly owned
subsidiary of such corporation, or by a wholly owned subsidiary of a corporation to such corporation; 
 (12)        by way of an exchange qualified under Section 25111, 25112 or 25113 of the Code, provided that no order under Section 25140 or subdivision (a) of Section 25143 is in
effect with respect to such qualification; 
 (13)        between residents of foreign
states, territories or countries who are neither domiciled nor actually present in this state; 
 (14)        to the State Controller pursuant to the Unclaimed Property Law or to the administrator of the unclaimed property law of another state; or 
 (15)        by the State Controller pursuant to the Unclaimed Property Law or by the administrator
of the unclaimed property law of another state if, in either such case, such person (i) discloses to potential purchasers at the sale that transfer of the securities is restricted under this rule, (ii) delivers to each purchaser a copy of
this rule, and (iii) advises the Commissioner of the name of each purchaser; 
 (16)        by a trustee to a successor trustee when such transfer does not involve a change in the beneficial ownership of the securities; 
 (17)        by way of an offer and sale of outstanding securities in an issuer transaction that is
subject to the qualification requirement of Section 25110 of the Code but exempt from that qualification requirement by subdivision (f) of Section 25102; provided that any such transfer is on the condition that any certificate
evidencing the security issued to such transferee shall contain the legend required by this section. 
 (c)        The certificates representing all such securities subject to such a restriction on transfer, whether upon initial issuance or upon any transfer thereof, shall bear on their face a legend,
prominently stamped or printed thereon in capital letters of not less than 10-point size, reading as follows: 
 “IT IS
UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR ANY INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA, EXCEPT AS PERMITTED IN
THE COMMISSIONER’S RULES.” 
  

 2 

 TURIN NETWORKS, INC. 
 1999 STOCK PLAN 
 STOCK OPTION AGREEMENT —
EARLY EXERCISE 
 Unless otherwise defined herein, the terms defined in the 1999 Stock Plan shall have the same defined
meanings in this Stock Option Agreement (the “Option Agreement”). 
 1. NOTICE OF STOCK OPTION GRANT 
 Name 
 Address 
 City, State, Zip 
 You have been granted an option to purchase Common Stock of the Company, subject to the terms and conditions of the Plan and this Option
Agreement, as follows: 
  

			
	Date of Grant	  	
	Vesting Commencement Date	  	
	Exercise Price per Share	  	
	Total Number of Shares Granted	  	
	Total Exercise Price	  	$
	Type of Option:	  	        Incentive Stock Option
		  	        Nonstatutory Stock Option
	Term/Expiration Date:	  	

 Exercise and Vesting Schedule: 
 This Option shall be exercisable in whole or in part, and shall vest according to the following vesting schedule: 
 25% of the Shares subject to the Option shall vest on the date that is 12 months after the Vesting Commencement Date, subject to
Optionee’s continuing to be a Service Provider on such date, and 1/48 of the Shares subject to the Option shall vest each month thereafter, subject to Optionee’s continuing to be a Service Provider on such dates. 
 Termination Period: 
 This Option may be exercised, to the extent it is then vested, for three months after Optionee ceases to be a Service Provider. Upon death or Disability of the Optionee, this Option may be exercised, to
the extent it is then vested, for one year after Optionee ceases to be Service Provider. In no event shall this Option be exercised later than the Term/Expiration Date as provided above. 

 2.    AGREEMENT 
 (a) Grant of Option. The Administrator of the Company hereby grants to the Optionee named in the Notice of Grant (the
“Optionee”), an option (the “Option”) to purchase the number of Shares set forth in the Notice of Grant, at the exercise price per Share set forth in the Notice of Grant (the “Exercise Price”), and subject to the terms
and conditions of the Plan, which is incorporated herein by reference. Subject to Section 14(c) of the Plan, in the event of a conflict between the terms and conditions of the Plan and this Option Agreement, the terms and conditions of the Plan
shall prevail. 
 If designated in the Notice of Grant as an Incentive Stock Option (“ISO”), this Option is intended
to qualify as an Incentive Stock Option as defined in Section 422 of the Code. Nevertheless, to the extent that it exceeds the $100,000 rule of Code Section 422(d), this Option shall be treated as a Nonstatutory Stock Option
(“NSO”). 
 (b) Exercise of Option. This Option shall be exercisable during its term in accordance with the
provisions of Section 9 of the Plan as follows: 
 (i)        Right to
Exercise. 
 (1) Subject to subsections 2(b)(i)(2) and 2(b)(i)(3) below, this Option shall be exercisable cumulatively
according to the vesting schedule set forth in the Notice of Grant. Alternatively, at the election of the Optionee, this Option may be exercised in whole or in part at any time as to Shares that have not yet vested. Vested Shares shall not be
subject to the Company’s repurchase right (as set forth in the Restricted Stock Purchase Agreement, attached hereto as Exhibit C-1). 
 (2) As a condition to exercising this Option for unvested Shares, the Optionee shall execute the Restricted Stock Purchase Agreement. 
 (3) This Option may not be exercised for a fraction of a Share. 
 (ii)        Method of Exercise. This Option shall be exercisable by delivery of an exercise
notice in the form attached as Exhibit A (the “Exercise Notice”) which shall state the election to exercise the Option, the number of Shares with respect to which the Option is being exercised, and such other representations and
agreements as may be required by the Company. The Exercise Notice shall be accompanied by payment of the aggregate Exercise Price as to all Exercised Shares. This Option shall be deemed to be exercised upon receipt by the Company of such fully
executed Exercise Notice accompanied by the aggregate Exercise Price. 
 No Shares shall be issued pursuant to the exercise of
an Option unless such issuance and such exercise complies with Applicable Laws. Assuming such compliance, for income tax purposes the Shares shall be considered transferred to the Optionee on the date on which the Option is exercised with respect to
such Shares. 
  

 -2- 

 (c) Optionee’s Representations. In the event the Shares have not been
registered under the Securities Act of 1933, as amended, at the time this Option is exercised, the Optionee shall, if required by the Company, concurrently with the exercise of all or any portion of this Option, deliver to the Company his or her
Investment Representation Statement in the form attached hereto as Exhibit B, and shall read the applicable rules of the Commissioner of Corporations attached to such Investment Representation Statement. 
 (d) Lock-Up Period. Optionee and his or her assigns hereby agrees not to sell, make short sale of, loan, grant any options for the
purchase of or otherwise transfer any Shares or other securities of the Company in connection with the offer, sale or registration of any of the Company’s securities under the Securities Act during the 180-day period (or in the case of
subsequent secondary offering during the 90-day period) (or such other period as may be requested in writing by the underwriters and agreed to in writing by the Company) (the “Market Standoff Period”) following the effective date of a
registration statement of the Company filed under the Securities Act. Optionee and his or her assigns, if any, further agrees to execute any agreement reflecting the foregoing as may be requested by the underwriters at the time of such public
offering. The Company may impose stop-transfer instructions with respect to securities subject to the foregoing restrictions until the end of such Market Standoff Period. 
 (e) Method of Payment. Payment of the aggregate Exercise Price shall be by any of the following, or a combination thereof, at the
election of the Optionee: 
 (i)        cash; 
 (ii)        check; 
 (iii)        consideration received by the Company under a formal cashless exercise program adopted by the Company in connection with the Plan; or 
 (iv)        surrender of other Shares which, (i) in the case of Shares acquired upon exercise
of an option, have been owned by the Optionee for more than six (6) months on the date of surrender, and (ii) have a Fair Market Value on the date of surrender equal to the aggregate Exercise Price of the Exercised Shares. 
 (f) Restrictions on Exercise. This Option may not be exercised until such time as the Plan has been approved by the shareholders of
the Company, or if the issuance of such Shares upon such exercise or the method of payment of consideration for such shares would constitute a violation of any Applicable Law. 
 (g) Non-Transferability of Option. This Option may not be transferred in any manner otherwise than by will or by the laws of descent
or distribution and may be exercised during the lifetime of Optionee only by Optionee. The terms of the Plan and this Option Agreement shall be binding upon the executors, administrators, heirs, successors and assigns of the Optionee. 
 (h) Term of Option. This Option may be exercised only within the term set out in the Notice of Grant, and may be exercised during
such term only in accordance with the Plan and the terms of this Option. 
  

 -3- 

 (i) Tax Consequences. Set forth below is a brief summary as of the date of this
Option of some of the federal tax consequences of the exercise of this Option and disposition of the Shares. THIS SUMMARY IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. THE OPTIONEE SHOULD CONSULT A TAX ADVISER
BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES. 
 (i)        Exercise of
NSO. There may be a regular federal income tax liability upon the exercise of an NSO. The Optionee will be treated as having received compensation income (taxable at ordinary income tax rates) equal to the excess, if any, of the Fair Market
Value of the Exercised Shares on the date of exercise over the Exercise Price. If Optionee is an Employee or a former Employee, the Company will be required to withhold from Optionee’s compensation or collect from Optionee and pay to the
applicable taxing authorities an amount in cash equal to a percentage of this compensation income at the time of exercise, and may refuse to honor the exercise and refuse to deliver Shares if such withholding amounts are not delivered at the time of
exercise. 
 (ii)        Exercise of ISO. If this Option qualifies as an ISO,
there will be no regular federal income tax liability upon the exercise of the Option, although the excess, if any, of the Fair Market Value of the Exercised Shares on the date of exercise over the Exercise Price will be treated as an adjustment to
the alternative minimum tax for federal tax purposes and may subject the Optionee to the alternative minimum tax in the year of exercise. 
 (iii)        Exercise of ISO Following Disability. If the Optionee ceases to be an Employee as a result of a disability that is not a total and permanent
disability as defined in Section 22(e)(3) of the Code, to the extent permitted on the date of termination, the Optionee must exercise an ISO within three months of such termination for the ISO to be qualified as an ISO. 
 (iv)        Disposition of Shares. In the case of an NSO, if Shares are held for at least
one year, any gain realized on disposition of the Shares will be treated as long-term capital gain for federal income tax purposes. In the case of an ISO, if Shares transferred pursuant to the Option are held for at least one year after exercise and
at least two years after the Date of Grant, any gain realized on disposition of the Shares will also be treated as long-term capital gain for federal income tax purposes. If Shares purchased under an ISO are disposed of within one year after
exercise or two years after the Date of Grant, any gain realized on such disposition will be treated as compensation income (taxable at ordinary income rates) to the extent of the difference between the Exercise Price of the Exercised Shares and the
lesser of (i) the Fair Market Value of the Exercised Shares on the date of exercise, or (ii) the sale price of the Exercised Shares. Different rules may apply if the Shares are subject to a substantial risk of forfeiture (within the
meaning of Section 83 of the Code) at the time of purchase. Any additional gain will be taxed as capital gain, short-term depending on the period that the ISO Shares were held. 
 (v)        Notice of Disqualifying Disposition of ISO Shares. If the Option granted to
Optionee herein is an ISO, and if Optionee sells or otherwise disposes of any of the Shares acquired pursuant to the ISO on or before the later of (i) the date two years after the Date of Grant, or (ii) the date one year after the date of
exercise, the Optionee shall immediately notify the Company in writing of such disposition. Optionee agrees that Optionee may be subject to income tax withholding by the Company on the compensation income recognized by the Optionee. 
  

 -4- 

 (vi)        Section 83(b) Election for
Unvested Shares Purchased Pursuant to Options. With respect to the exercise of an Option for unvested Shares, an election (the “Election”) may be filed by the Optionee with the Internal Revenue Service, within 30 days of the
purchase of the Shares, electing to be taxed currently on any difference between the purchase price of the Shares and their Fair Market Value on the date of purchase pursuant to Section 83(b) of the Code. In the case of an NSO, this will result
in recognition of taxable income to the Optionee on the date of exercise, measured by the excess, if any, of the Fair Market Value of the Exercised Shares, at the time the Option is exercised over the purchase price for the Exercised Shares. Absent
such an election, taxable income will be measured and recognized by Optionee at the time or times on which the Company’s Repurchase Option lapses. In the case of an ISO, such an election will result in recognition of income to the Optionee for
alternative minimum tax purposes on the date of exercise, measured by the excess, if any, of the Fair Market Value of the Exercised Shares, at the time the Option is exercised, over the purchase price for the Exercised Shares. Absent such an
election, alternative minimum taxable income will be measured and recognized by Optionee at the time or times on which the Company’s Repurchase Option lapses. Optionee is strongly encouraged to seek the advice of his or her own tax consultants
in connection with the purchase of the Shares and the advisability of filing of the Election under Section 83(b) of the Code. A form of Election under Section 83(b) is attached hereto as Exhibit C-5 for reference. 
 OPTIONEE ACKNOWLEDGES THAT IT IS OPTIONEE’S SOLE RESPONSIBILITY AND NOT THE COMPANY’S TO FILE TIMELY THE ELECTION UNDER
SECTION 83(b), EVEN IF OPTIONEE REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO MAKE THIS FILING ON OPTIONEE’S BEHALF. 
 (j) Entire Agreement; Governing Law. The Plan is incorporated herein by reference. The Plan and this Option Agreement constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with respect to the subject matter hereof, and may not be modified adversely to the Optionee’s interest except by means of a writing signed by the Company and Optionee.
This Option Agreement is governed by the internal substantive laws, but not the choice of law rules, of California. 
 (k)
No Guarantee of Continued Service. OPTIONEE ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (NOT THROUGH THE ACT OF BEING
HIRED, BEING GRANTED THIS OPTION OR ACQUIRING SHARES HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED
PROMISE OF CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE IN ANY WAY WITH OPTIONEE’S RIGHT OR THE COMPANY’S RIGHT TO TERMINATE OPTIONEE’S RELATIONSHIP AS A SERVICE
PROVIDER AT ANY TIME, WITH OR WITHOUT CAUSE. 
  

 -5- 

 Optionee acknowledges receipt of a copy of the Plan and represents that he or she is
familiar with the terms and provisions thereof, and hereby accepts this Option subject to all of the terms and provisions thereof. Optionee has reviewed the Plan and this Option in their entirety, has had an opportunity to obtain the advice of
counsel prior to executing this Option and fully understands all provisions of the Option. Optionee hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the
Plan or this Option. Optionee further agrees to notify the Company upon any change in the residence address indicated below. 
  

			
	OPTIONEE	  	TURIN NETWORKS, INC.
	  
	  	  

	Signature	  	By
	  
	  	  

	Name	  	Title
	  
	  	
	Residence Address	  	
	  
	  	

  

 -6- 

 EXHIBIT A 
 1999 STOCK PLAN 
 EXERCISE NOTICE 
 Turin Networks, Inc. 
 1415 N. McDowell Boulevard

 Petaluma, CA 94954 
 Attention: President 
 1.        Exercise of Option. Effective as of
today,                     ,             , the undersigned (“Optionee”) hereby
elects to exercise Optionee’s option (the “Option”) to purchase                      shares of the Common Stock (the
“Shares”) of Turin Networks, Inc. (the “Company”) under and pursuant to the 1999 Stock Plan (the “Plan”) and the Stock Option Agreement dated             ,
             (the “Option Agreement”). 
 2.        Delivery of Payment. Purchaser herewith delivers to the Company the full purchase price of the Shares, as set forth in the Option Agreement. 
 3.        Representations of Optionee. Optionee acknowledges that Optionee has received, read
and understood the Plan and the Option Agreement and agrees to abide by and be bound by their terms and conditions. 
 4.        Rights as Shareholder. Until the issuance of the Shares (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the Company), no
right to vote or receive dividends or any other rights as a shareholder shall exist with respect to the optioned stock, notwithstanding the exercise of the Option. The Shares shall be issued to the Optionee as soon as practicable after the Option is
exercised. No adjustment shall be made for a dividend or other right for which the record date is prior to the date of issuance except as provided in Section 12 of the Plan. 
 5.        Company’s Right of First Refusal. Before any Shares held by Optionee or any
transferee (either being sometimes referred to herein as the “Holder”) may be sold or otherwise transferred (including transfer by gift or operation of law), the Company or its assignee(s) shall have a right of first refusal to purchase
the Shares on the terms and conditions set forth in this Section (the “Right of First Refusal”). 
 (a)        Notice of Proposed Transfer. The Holder of the Shares shall deliver to the Company a written notice (the “Notice”) stating: (i) the Holder’s bona fide intention
to sell or otherwise transfer such Shares; (ii) the name of each proposed purchaser or other transferee (“Proposed Transferee”); (iii) the number of Shares to be transferred to each Proposed Transferee; and (iv) the bona
fide cash price or other consideration for which the Holder proposes to transfer the Shares (the “Offered Price”), and the Holder shall offer the Shares at the Offered Price to the Company or its assignee(s). 

 (b)        Exercise of Right of First
Refusal. At any time within thirty (30) days after receipt of the Notice, the Company and/or its assignee(s) may, by giving written notice to the Holder, elect to purchase all, but not less than all, of the Shares proposed to be transferred
to any one or more of the Proposed Transferees, at the purchase price determined in accordance with subsection (c) below. 
 (c)        Purchase Price. The purchase price (“Purchase Price”) for the Shares purchased by the Company or its assignee(s) under this Section shall be the Offered Price. If the
Offered Price includes consideration other than cash, the cash equivalent value of the non-cash consideration shall be determined by the Board of Directors of the Company in good faith. 
 (d)        Payment. Payment of the Purchase Price shall be made, at the option of the
Company or its assignee(s), in cash (by check), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company (or, in the case of repurchase by an assignee, to the assignee), or by any combination thereof within 30
days after receipt of the Notice or in the manner and at the times set forth in the Notice. 
 (e)        Holder’s Right to Transfer. If all of the Shares proposed in the Notice to be transferred to a given Proposed Transferee are not purchased by the Company and/or its assignee(s)
as provided in this Section, then the Holder may sell or otherwise transfer such Shares to that Proposed Transferee at the Offered Price or at a higher price, provided that such sale or other transfer is consummated within 120 days after the date of
the Notice, that any such sale or other transfer is effected in accordance with any applicable securities laws and that the Proposed Transferee agrees in writing that the provisions of this Section shall continue to apply to the Shares in the hands
of such Proposed Transferee. If the Shares described in the Notice are not transferred to the Proposed Transferee within such period, a new Notice shall be given to the Company, and the Company and/or its assignees shall again be offered the Right
of First Refusal before any Shares held by the Holder may be sold or otherwise transferred. 
 (f)        Exception for Certain Family Transfers. Anything to the contrary contained in this Section notwithstanding, the transfer of any or all of the Shares during the Optionee’s
lifetime or on the Optionee’s death by will or intestacy to the Optionee’s immediate family or a trust for the benefit of the Optionee’s immediate family shall be exempt from the provisions of this Section. “Immediate
Family” as used herein shall mean spouse, lineal descendant or antecedent, father, mother, brother or sister. In such case, the transferee or other recipient shall receive and hold the Shares so transferred subject to the provisions of this
Section, and there shall be no further transfer of such Shares except in accordance with the terms of this Section. 
 (g)        Termination of Right of First Refusal. The Right of First Refusal shall terminate as to any Shares upon the first sale of Common Stock of the Company to the general public pursuant
to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act of 1933, as amended. 
 6.        Tax Consultation. Optionee understands that Optionee may suffer adverse tax consequences as a result of Optionee’s purchase or disposition of
the Shares. Optionee represents that Optionee has consulted with any tax consultants Optionee deems advisable in connection with the purchase or disposition of the Shares and that Optionee is not relying on the Company for any tax advice.

  

 -2- 

 7.        Restrictive Legends and Stop-Transfer
Orders. 
 (a)        Legends. Optionee understands and agrees that the
Company shall cause the legends set forth below or legends substantially equivalent thereto, to be placed upon any certificate(s) evidencing ownership of the Shares together with any other legends that may be required by the Company or by state or
federal securities laws: 
 THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE
“ACT”) AND MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL REGISTERED UNDER THE ACT OR, IN THE OPINION OF COMPANY COUNSEL SATISFACTORY TO THE ISSUER OF THESE SECURITIES, SUCH OFFER, SALE OR
TRANSFER, PLEDGE OR HYPOTHECATION IS IN COMPLIANCE THEREWITH. 
 THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO
CERTAIN RESTRICTIONS ON TRANSFER AND RIGHT OF FIRST REFUSAL OPTIONS HELD BY THE ISSUER OR ITS ASSIGNEE(S) AS SET FORTH IN THE EXERCISE NOTICE BETWEEN THE ISSUER AND THE ORIGINAL HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE
PRINCIPAL OFFICE OF THE ISSUER. SUCH TRANSFER RESTRICTIONS AND RIGHT OF FIRST REFUSAL ARE BINDING ON TRANSFEREES OF THESE SHARES. 
 IT IS UNLAWFUL TO CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR ANY INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA, EXCEPT AS
PERMITTED IN THE COMMISSIONER’S RULES. 
 Optionee understands that transfer of the Shares may be restricted by
Section 260.141.11 of the Rules of the California Corporations Commissioner, a copy of which is attached to Exhibit B, the Investment Representation Statement. 
 (b)        Stop-Transfer Notices. Optionee agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue
appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 
  

 -3- 

 (c)        Refusal to Transfer. The Company
shall not be required (i) to transfer on its books any Shares that have been sold or otherwise transferred in violation of any of the provisions of this Exercise Notice or (ii) to treat as owner of such Shares or to accord the right to
vote or pay dividends to any purchaser or other transferee to whom such Shares shall have been so transferred. 
 8.        Successors and Assigns. The Company may assign any of its rights under this Exercise Notice to single or multiple assignees, and the terms and conditions of this Exercise Notice shall
inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth, the terms and conditions of this Exercise Notice shall be binding upon Optionee and his or her heirs, executors,
administrators, successors and assigns. 
 9.        Interpretation. Any dispute
regarding the interpretation of this Exercise Notice shall be submitted by Optionee or by the Company forthwith to the Administrator, which shall review such dispute at its next regular meeting. The resolution of such a dispute by the Administrator
shall be final and binding on all parties. 
 10.      Governing Law; Severability. This
Exercise Notice is governed by the internal substantive laws, but not the choice of law rules, of California. 
 11.      Entire Agreement. The Plan and Option Agreement are incorporated herein by reference. This Exercise Notice, the Plan, the Restricted Stock Purchase Agreement, the Option Agreement and the
Investment Representation Statement constitute the entire agreement of the parties with respect to the subject matter hereof and supersede in their entirety all prior undertakings and agreements of the Company and Optionee with respect to the
subject matter hereof, and may not be modified adversely to the Optionee’s interest except by means of a writing signed by the Company and Optionee. 
  

			
	Submitted by:	  	Accepted by:
		
	OPTIONEE	  	TURIN NETWORKS, INC.
	  
	  	  

	Signature	  	By
	  
	  	  

	Name	  	Its
		
	  
	  	Address:
	Residence Address	  	
	 	  	 1415 North McDowell Blvd.
 Petaluma, CA 94954

		  	  

		  	Date Received

  

 -4- 

 EXHIBIT B 
 INVESTMENT REPRESENTATION STATEMENT 
  

	         OPTIONEE    :	

  

	         COMPANY    :	    TURIN NETWORKS, INC. 

  

	         SECURITY    :	    COMMON STOCK 

  

	         AMOUNT      :	

  

	         DATE             :	

 In connection with the
purchase of the above-listed Securities, the undersigned Optionee represents to the Company the following: 
 (a)        Optionee is aware of the Company’s business affairs and financial condition and has acquired sufficient information about the Company to reach an informed and knowledgeable decision to
acquire the Securities. Optionee is acquiring these Securities for investment for Optionee’s own account only and not with a view to, or for resale in connection with, any “distribution” thereof within the meaning of the Securities
Act of 1933, as amended (the “Securities Act”). 
 (b)        Optionee
acknowledges and understands that the Securities constitute “restricted securities” under the Securities Act and have not been registered under the Securities Act in reliance upon a specific exemption therefrom, which exemption depends
upon, among other things, the bona fide nature of Optionee’s investment intent as expressed herein. In this connection, Optionee understands that, in the view of the Securities and Exchange Commission, the statutory basis for such exemption may
be unavailable if Optionee’s representation was predicated solely upon a present intention to hold these Securities for the minimum capital gains period specified under tax statutes, for a deferred sale, for or until an increase or decrease in
the market price of the Securities, or for a period of one year or any other fixed period in the future. Optionee further understands that the Securities must be held indefinitely unless they are subsequently registered under the Securities Act or
an exemption from such registration is available. Optionee further acknowledges and understands that the Company is under no obligation to register the Securities. Optionee understands that the certificate evidencing the Securities will be imprinted
with a legend which prohibits the transfer of the Securities unless they are registered or such registration is not required in the opinion of counsel satisfactory to the Company, a legend prohibiting their transfer without the consent of the
Commissioner of Corporations of the State of California and with any other legend required under applicable state securities laws. 
 (c)        Optionee is familiar with the provisions of Rule 701 and Rule 144, each promulgated under the Securities Act, which, in substance, permit limited public resale of “restricted
securities” acquired, directly or indirectly from the issuer thereof, in a non-public offering subject to the satisfaction of certain conditions. Rule 701 provides that if the issuer qualifies under Rule 701 at

 
the time of the grant of the Option to the Optionee, the exercise will be exempt from registration under the Securities Act. In the event the Company becomes subject to the reporting requirements
of Section 13 or 15(d) of the Securities Exchange Act of 1934, ninety (90) days thereafter (or such longer period as any market stand-off agreement may require) the Securities exempt under Rule 701 may be resold, subject to the
satisfaction of certain of the conditions specified by Rule 144, including: (1) the resale being made through a broker in an unsolicited “broker’s transaction” or in transactions directly with a market maker (as said
term is defined under the Securities Exchange Act of 1934); and, in the case of an affiliate, (2) the availability of certain public information about the Company, (3) the amount of Securities being sold during any three month period not
exceeding the limitations specified in Rule 144(e), and (4) the timely filing of a Form 144, if applicable. 
 In the
event that the Company does not qualify under Rule 701 at the time of grant of the Option, then the Securities may be resold in certain limited circumstances subject to the provisions of Rule 144, which requires the resale to occur
not less than one year after the later of the date the Securities were sold by the Company or the date the Securities were sold by an affiliate of the Company, within the meaning of Rule 144; and, in the case of acquisition of the Securities by
an affiliate, or by a non-affiliate who subsequently holds the Securities less than two years, the satisfaction of the conditions set forth in sections (1), (2), (3) and (4) of the paragraph immediately above. 
 (d)        Optionee further understands that in the event all of the applicable requirements of
Rule 701 or 144 are not satisfied, registration under the Securities Act, compliance with Regulation A, or some other registration exemption will be required; and that, notwithstanding the fact that Rules 144 and 701 are not exclusive, the
Staff of the Securities and Exchange Commission has expressed its opinion that persons proposing to sell private placement securities other than in a registered offering and otherwise than pursuant to Rules 144 or 701 will have a substantial burden
of proof in establishing that an exemption from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk. Optionee understands that no
assurances can be given that any such other registration exemption will be available in such event. 
 (e)        Optionee understands that the certificate evidencing the Securities will be imprinted with a legend which prohibits the transfer of the Securities without the consent of the Commissioner of
Corporations of California. Optionee has read the applicable Commissioner’s Rules with respect to such restriction, a copy of which is attached. 
  

			
	Signature of Optionee:
	
	  

		
	Date:	 	  

  

 -2- 

 ATTACHMENT 1 
 STATE OF CALIFORNIA - CALIFORNIA ADMINISTRATIVE CODE 
 Title 10. Investment
- Chapter 3. Commissioner of Corporations 
 260.141.11: Restriction on Transfer. 
 (a)        The issuer of any security upon which a restriction on transfer has been imposed pursuant
to Sections 260.102.6, 260.141.10 or 260.534 shall cause a copy of this section to be delivered to each issuee or transferee of such security at the time the certificate evidencing the security is delivered to the issuee or transferee. 

(b)        It is unlawful for the holder of any such security to consummate a sale or transfer of
such security, or any interest therein, without the prior written consent of the Commissioner (until this condition is removed pursuant to Section 260.141.12 of these rules), except: 
 (1)        to the issuer; 
 (2)        pursuant to the order or process of any court; 
 (3)        to any person described in Subdivision (i) of Section 25102 of the Code or
Section 260.105.14 of these rules; 
 (4)        to the transferor’s
ancestors, descendants or spouse, or any custodian or trustee for the account of the transferor or the transferor’s ancestors, descendants, or spouse; or to a transferee by a trustee or custodian for the account of the transferee or the
transferee’s ancestors, descendants or spouse; 
 (5)        to holders of
securities of the same class of the same issuer; 
 (6)        by way of gift or
donation inter vivos or on death; 
 (7)        by or through a broker-dealer licensed
under the Code (either acting as such or as a finder) to a resident of a foreign state, territory or country who is neither domiciled in this state to the knowledge of the broker-dealer, nor actually present in this state if the sale of such
securities is not in violation of any securities law of the foreign state, territory or country concerned; 
 (8)        to a broker-dealer licensed under the Code in a principal transaction, or as an underwriter or member of an underwriting syndicate or selling group; 
 (9)        if the interest sold or transferred is a pledge or other lien given by the purchaser to
the seller upon a sale of the security for which the Commissioner’s written consent is obtained or under this rule not required; 
 (10)      by way of a sale qualified under Sections 25111, 25112, 25113 or 25121 of the Code, of the securities to be transferred, provided that no order under Section 25140 or subdivision (a) of
Section 25143 is in effect with respect to such qualification; 
 (11)      by a corporation
to a wholly owned subsidiary of such corporation, or by a wholly owned subsidiary of a corporation to such corporation; 
 (12)      by way of an exchange qualified under Section 25111, 25112 or 25113 of the Code, provided that no order under Section 25140 or subdivision (a) of Section 25143 is in effect with
respect to such qualification; 

 (13)      between residents of foreign states, territories or
countries who are neither domiciled nor actually present in this state; 
 (14)      to the State
Controller pursuant to the Unclaimed Property Law or to the administrator of the unclaimed property law of another state; or 
 (15)      by the State Controller pursuant to the Unclaimed Property Law or by the administrator of the unclaimed property law of another state if, in either such case, such person (i) discloses to
potential purchasers at the sale that transfer of the securities is restricted under this rule, (ii) delivers to each purchaser a copy of this rule, and (iii) advises the Commissioner of the name of each purchaser; 
 (16)      by a trustee to a successor trustee when such transfer does not involve a change in the beneficial
ownership of the securities; 
 (17)      by way of an offer and sale of outstanding securities in
an issuer transaction that is subject to the qualification requirement of Section 25110 of the Code but exempt from that qualification requirement by subdivision (f) of Section 25102; provided that any such transfer is on the
condition that any certificate evidencing the security issued to such transferee shall contain the legend required by this section. 
 (c)      The certificates representing all such securities subject to such a restriction on transfer, whether upon initial issuance or upon any transfer thereof, shall bear on their face a legend, prominently
stamped or printed thereon in capital letters of not less than 10-point size, reading as follows: 
 “IT IS UNLAWFUL TO
CONSUMMATE A SALE OR TRANSFER OF THIS SECURITY, OR ANY INTEREST THEREIN, OR TO RECEIVE ANY CONSIDERATION THEREFOR, WITHOUT THE PRIOR WRITTEN CONSENT OF THE COMMISSIONER OF CORPORATIONS OF THE STATE OF CALIFORNIA, EXCEPT AS PERMITTED IN THE
COMMISSIONER’S RULES.” 
  

 -2- 

 EXHIBIT C-1 
 TURIN NETWORKS, INC. 
 1999 STOCK PLAN

 RESTRICTED STOCK PURCHASE AGREEMENT 
 THIS AGREEMENT is made between              (the “Purchaser”) and Turin Networks, Inc. (the “Company”) as of
            ,             . 
 Unless otherwise defined herein, the terms defined in the 1999 Stock Plan shall have the same defined meanings in this Agreement. 
 RECITALS 
 A.        Pursuant to the exercise of the option granted to Purchaser under the Plan and pursuant to the Option Agreement dated
            ,             by and between the Company and Purchaser with respect to such grant (the “Option”), which
Plan and Option Agreement are hereby incorporated by reference, Purchaser has elected to purchase             of those shares of Common Stock which have not become vested under the vesting
schedule set forth in the Option Agreement (“Unvested Shares”). The Unvested Shares and the shares subject to the Option Agreement which have become vested are sometimes collectively referred to herein as the “Shares.”

 B.        As required by the Option Agreement, as a condition to Purchaser’s
election to exercise the option, Purchaser must execute this Agreement, which sets forth the rights and obligations of the parties with respect to Shares acquired upon exercise of the Option. 
 1.        Repurchase Option. 
 (a)        If Purchaser’s status as a Service Provider is terminated for any reason, including
for cause, death, and Disability, the Company shall have the right and option to purchase from Purchaser, or Purchaser’s personal representative, as the case may be, all of the Purchaser’s Unvested Shares as of the date of such termination
at the price paid by the Purchaser for such Shares (the “Repurchase Option”). 
 (b)        Upon the occurrence of such termination, the Company may exercise its Repurchase Option by delivering personally or by registered mail, to Purchaser (or his transferee or legal
representative, as the case may be), within ninety (90) days of the termination, a notice in writing indicating the Company’s intention to exercise the Repurchase Option and setting forth a date for closing not later than thirty
(30) days from the mailing of such notice. The closing shall take place at the Company’s office. At the closing, the holder of the certificates for the Unvested Shares being transferred shall deliver the stock certificate or certificates
evidencing the Unvested Shares, and the Company shall deliver the purchase price therefore. 

 (c)        At its option, the Company may elect to
make payment for the Unvested Shares to a bank selected by the Company. The Company shall avail itself of this option by a notice in writing to Purchaser stating the name and address of the bank, date of closing, and waiving the closing at the
Company’s office. 
 (d)        If the Company does not elect to exercise the
Repurchase Option conferred above by giving the requisite notice within ninety (90) days following the termination, the Repurchase Option shall terminate. 
 (e)        The Repurchase Option shall terminate in accordance with the vesting schedule contained in Optionee’s Option Agreement. 
 2.        Transferability of the Shares; Escrow. 
 (a)        Purchaser hereby authorizes and directs the Secretary of the Company, or such other
person designated by the Company, to transfer the Unvested Shares as to which the Repurchase Option has been exercised from Purchaser to the Company. 
 (b)        To insure the availability for delivery of Purchaser’s Unvested Shares upon repurchase by the Company pursuant to the Repurchase Option under
Section 1, Purchaser hereby appoints the Secretary, or any other person designated by the Company as escrow agent, as its attorney-in-fact to sell, assign and transfer unto the Company, such Unvested Shares, if any, repurchased by the Company
pursuant to the Repurchase Option and shall, upon execution of this Agreement, deliver and deposit with the Secretary of the Company, or such other person designated by the Company, the share certificates representing the Unvested Shares, together
with the stock assignment duly endorsed in blank, attached hereto as Exhibit C-2. The Unvested Shares and stock assignment shall be held by the secretary in escrow, pursuant to the Joint Escrow Instructions of the Company and Purchaser
attached as Exhibit C-3 hereto, until the Company exercises its Repurchase Option, until such Unvested Shares are vested, or until such time as this Agreement no longer is in effect. As a further condition to the Company’s
obligations under this Agreement, the spouse of the Purchaser, if any, shall execute and deliver to the Company the Consent of Spouse attached hereto as Exhibit C-4. Upon vesting of the Unvested Shares, the escrow agent shall promptly deliver
to the Purchaser the certificate or certificates representing such Shares in the escrow agent’s possession belonging to the Purchaser, and the escrow agent shall be discharged of all further obligations hereunder; provided, however, that the
escrow agent shall nevertheless retain such certificate or certificates as escrow agent if so required pursuant to other restrictions imposed pursuant to this Agreement. 
  

 -2- 

 (c)        The Company, or its designee, shall not
be liable for any act it may do or omit to do with respect to holding the Shares in escrow and while acting in good faith and in the exercise of its judgment. 
 (d)        Transfer or sale of the Shares is subject to restrictions on transfer imposed by any applicable state and federal securities laws. Any transferee shall
hold such Shares subject to all the provisions hereof and the Exercise Notice executed by the Purchaser with respect to any Unvested Shares purchased by Purchaser and shall acknowledge the same by signing a copy of this Agreement. 
 3.        Ownership, Voting Rights, Duties. This Agreement shall not affect in any way the
ownership, voting rights or other rights or duties of Purchaser, except as specifically provided herein. 
 4.        Legends. The share certificate evidencing the Shares issued hereunder shall be endorsed with the following legend (in addition to any legend required under applicable federal and
state securities laws): 
 THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS UPON TRANSFER AND
RIGHTS OF REPURCHASE AS SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. 
 5.        Adjustment for Stock Split. All references to the number of Shares and the purchase price of the Shares in this Agreement shall be appropriately
adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made by the Company pursuant to Section 12 of the Plan after the date of this Agreement. 
 6.        Notices. Notices required hereunder shall be given in person or by registered mail
to the address of Purchaser shown on the records of the Company, and to the Company at their respective principal executive offices. 
 7.        Survival of Terms. This Agreement shall apply to and bind Purchaser and the Company and their respective permitted assignees and transferees, heirs, legatees, executors,
administrators and legal successors. 
 8.        Section 83(b) Election.
Purchaser hereby acknowledges that he or she has been informed that, with respect to the exercise of an Option for Unvested Shares, an election (the “Election”) may be filed by the Purchaser with the Internal Revenue Service, within 30
days of the purchase of the exercised Shares, electing pursuant to Section 83(b) of the Code to be taxed currently on any difference between the purchase price of the exercised Shares and their Fair Market Value on the date of purchase. In the
case of a Nonstatutory Stock Option, this will result in a recognition of taxable income to the Purchaser on the date of exercise, measured by the excess, if any, of the Fair Market Value of the exercised Shares, at the time the Option is exercised
over the purchase price for the exercised Shares. Absent such an Election, taxable income will be measured and recognized by Purchaser at the time or times on which the Company’s Repurchase Option lapses. In the case of an Incentive Stock
Option, such an Election will result in a recognition of income to the Purchaser for alternative minimum tax purposes on the date of exercise, measured by the excess, if any, of the Fair Market Value of the exercised Shares, at the time the option
is exercised, over the purchase price for the exercised Shares. Absent such an Election, alternative minimum taxable income will be measured and recognized by Purchaser at the time or times on which the Company’s Repurchase Option lapses.
Purchaser is strongly encouraged to seek the advice

  

 -3- 

 
of his or her own tax consultants in connection with the purchase of the Shares and the advisability of filing of the Election under Section 83(b) of the Code. A form of Election under
Section 83(b) is attached hereto as Exhibit C-5 for reference. 
 PURCHASER ACKNOWLEDGES THAT IT IS PURCHASER’S SOLE
RESPONSIBILITY AND NOT THE COMPANY’S TO FILE TIMELY THE ELECTION UNDER SECTION 83(b) OF THE CODE, EVEN IF PURCHASER REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO MAKE THIS FILING ON PURCHASER’S BEHALF. 
 9.        Representations. Purchaser has reviewed with his or her own tax advisors the
federal, state, local and foreign tax consequences of this investment and the transactions contemplated by this Agreement. Purchaser is relying solely on such advisors and not on any statements or representations of the Company or any of its agents.
Purchaser understands that he or she (and not the Company) shall be responsible for his or her own tax liability that may arise as a result of this investment or the transactions contemplated by this Agreement. 
 10.        Governing Law. This Agreement shall be governed by the internal substantive laws,
but not the choice of law rules, of California. 
 Purchaser represents that he or she has read this Agreement and is familiar
with its terms and provisions. Purchaser hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under this Agreement. 
  

 -4- 

 IN WITNESS WHEREOF, this Agreement is deemed made as of the date first set forth above.

  

			
	OPTIONEE	  	TURIN NETWORKS, INC.
	  
	  	  

	Signature	  	By
	  
	  	  

	Name	  	Its
		
	  
	  	Address:
	Residence Address	  	
	 	  	 1415 North McDowell Blvd.
 Petaluma, CA 94954

		
	  
	  	
	Dated	  	

  

 -5- 

 EXHIBIT C-2 
 ASSIGNMENT SEPARATE FROM CERTIFICATE 
 FOR VALUE
RECEIVED I,
                                        , hereby
sell, assign and transfer unto Turin Networks, Inc.
                                        
(            ) shares of the Common Stock of Turin Networks, Inc. standing in my name of the books of said corporation represented by Certificate
No.              herewith and do hereby irrevocably constitute and
appoint                      to transfer the said stock on the books of the within named corporation with full power of substitution in the
premises. 
 This Stock Assignment may be used only in accordance with the Restricted Stock Purchase Agreement between Turin
Networks, Inc. and the undersigned dated                     ,         . 
  

									
	Dated:	 	                    ,        	 		 	Signature:	 	  

 INSTRUCTIONS: Please do not fill in any blanks other than the signature line. The purpose of this assignment is to enable the Company to
exercise its “repurchase option,” as set forth in the Agreement, without requiring additional signatures on the part of the Purchaser. 

 EXHIBIT C-3 
 JOINT ESCROW INSTRUCTIONS 
 Corporate Secretary 
 Turin Networks, Inc. 
 1415 N. McDowell Boulevard

 Petaluma, CA 94954 
 Dear                         : 
 As Escrow Agent for both Turin Networks, Inc. (the “Company”), and the undersigned purchaser of stock of the Company (the “Purchaser”), you are hereby authorized and directed to hold
the documents delivered to you pursuant to the terms of that certain Restricted Stock Purchase Agreement (the “Agreement”) between the Company and the undersigned, in accordance with the following instructions: 
 1.   In the event the Company and/or any assignee of the Company (referred to collectively for convenience herein as the
“Company”) exercises the Company’s repurchase option set forth in the Agreement, the Company shall give to Purchaser and you a written notice specifying the number of shares of stock to be purchased, the purchase price, and the time
for a closing hereunder at the principal office of the Company. Purchaser and the Company hereby irrevocably authorize and direct you to close the transaction contemplated by such notice in accordance with the terms of said notice. 
 2.   At the closing, you are directed (a) to date the stock assignments necessary for the transfer in question,
(b) to fill in the number of shares being transferred, and (c) to deliver the stock assignments, together with the certificate evidencing the shares of stock to be transferred, to the Company or its assignee, against the simultaneous
delivery to you of the purchase price (by cash, a check, or some combination thereof) for the number of shares of stock being purchased pursuant to the exercise of the Company’s repurchase option. 
 3.   Purchaser irrevocably authorizes the Company to deposit with you any certificates evidencing shares of stock to be held
by you hereunder and any additions and substitutions to said shares as defined in the Agreement. Purchaser does hereby irrevocably constitute and appoint you as Purchaser’s attorney-in-fact and agent for the term of this escrow to execute with
respect to such securities all documents necessary or appropriate to make such securities negotiable and to complete any transaction herein contemplated, including but not limited to the filing with any applicable state blue sky authority of any
required applications for consent to, or notice of transfer of, the securities. Subject to the provisions of this paragraph 3, Purchaser shall exercise all rights and privileges of a stockholder of the Company while the stock is held by you.

 4.   Upon written request of the Purchaser, but no more than once per calendar year, unless the Company’s
repurchase option has been exercised, you will deliver to Purchaser a certificate or certificates representing so many shares of stock as are not then subject to the Company’s repurchase option. Within 120 days after cessation of
Purchaser’s continuous employment by or services to the Company, or any parent or subsidiary of the Company, you will deliver to Purchaser a certificate or

 
certificates representing the aggregate number of shares held or issued pursuant to the Agreement and not purchased by the Company or its assignees pursuant to exercise of the Company’s
repurchase option. 
 5.   If at the time of termination of this escrow you should have in your possession any
documents, securities, or other property belonging to Purchaser, you shall deliver all of the same to Purchaser and shall be discharged of all further obligations hereunder. 
 6.   Your duties hereunder may be altered, amended, modified or revoked only by a writing signed by all of the parties
hereto. 
 7.   You shall be obligated only for the performance of such duties as are specifically set forth
herein and may rely and shall be protected in relying or refraining from acting on any instrument reasonably believed by you to be genuine and to have been signed or presented by the proper party or parties. You shall not be personally liable for
any act you may do or omit to do hereunder as Escrow Agent or as attorney-in-fact for Purchaser while acting in good faith, and any act done or omitted by you pursuant to the advice of your own attorneys shall be conclusive evidence of such good
faith. 
 8.   You are hereby expressly authorized to disregard any and all warnings given by any of the parties
hereto or by any other person or corporation, excepting only orders or process of courts of law and are hereby expressly authorized to comply with and obey orders, judgments or decrees of any court. In case you obey or comply with any such order,
judgment or decree, you shall not be liable to any of the parties hereto or to any other person, firm or corporation by reason of such compliance, notwithstanding any such order, judgment or decree being subsequently reversed, modified, annulled,
set aside, vacated or found to have been entered without jurisdiction. 
 9.   You shall not be liable in any
respect on account of the identity, authorities or rights of the parties executing or delivering or purporting to execute or deliver the Agreement or any documents or papers deposited or called for hereunder. 
 10. You shall not be liable for the outlawing of any rights under the Statute of Limitations with respect to these Joint Escrow Instructions
or any documents deposited with you. 
 11. You shall be entitled to employ such legal counsel and other experts as you may deem
necessary properly to advise you in connection with your obligations hereunder, may rely upon the advice of such counsel, and may pay such counsel reasonable compensation therefor. 
 12. Your responsibilities as Escrow Agent hereunder shall terminate if you shall cease to be an officer or agent of the Company or if you
shall resign by written notice to each party. In the event of any such termination, the Company shall appoint a successor Escrow Agent. 
 13. If you reasonably require other or further instruments in connection with these Joint Escrow Instructions or obligations in respect hereto, the necessary parties hereto shall join in furnishing such
instruments. 
  

 -2- 

 14. It is understood and agreed that should any dispute arise with respect to the delivery
and/or ownership or right of possession of the securities held by you hereunder, you are authorized and directed to retain in your possession without liability to anyone all or any part of said securities until such disputes shall have been settled
either by mutual written agreement of the parties concerned or by a final order, decree or judgment of a court of competent jurisdiction after the time for appeal has expired and no appeal has been perfected, but you shall be under no duty
whatsoever to institute or defend any such proceedings. 
 15. Any notice required or permitted hereunder shall be given in
writing and shall be deemed effectively given upon personal delivery or upon deposit in the United States Post Office, by registered or certified mail with postage and fees prepaid, addressed to each of the other parties thereunto entitled at the
following addresses or at such other addresses as a party may designate by ten days’ advance written notice to each of the other parties hereto. 
 16. By signing these Joint Escrow Instructions, you become a party hereto only for the purpose of said Joint Escrow Instructions; you do not become a party to the Agreement. 
 17. This instrument shall be binding upon and inure to the benefit of the parties hereto, and their respective successors and permitted
assigns. 
 18. These Joint Escrow Instructions shall be governed by the internal substantive laws, but not the choice of law
rules, of California. 
  

					
	PURCHASER	 		 	TURIN NETWORKS, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

	Name	 		 	Title
			
	  
	 		 	Address:
	Residence Address	 		 	
	  
  
	 		 	 1415 North McDowell Blvd.
 Petaluma, CA 94954

			
	ESCROW AGENT	 		 	
			
	  
	 		 	
	Corporate Secretary	 		 	

  

 -3- 

 EXHIBIT C-4 
 CONSENT OF SPOUSE 
 I,
                            , spouse of
                                , have read and approve the foregoing Restricted Stock
Purchase Agreement (the “Agreement”). In consideration of granting of the right to my spouse to purchase shares of
                                         
       , as set forth in the Agreement, I hereby appoint my spouse as my attorney-in-fact in respect to the exercise of any rights under the Agreement and agree to be bound by the provisions of the Agreement insofar
as I may have any rights in said Agreement or any shares issued pursuant thereto under the community property laws or similar laws relating to marital property in effect in the state of our residence as of the date of the signing of the foregoing
Agreement. 
  

									
	Dated:	 	                    ,        	 		 	Signature:	 	  

 EXHIBIT C-5 
 ELECTION UNDER SECTION 83(b) 
 OF THE INTERNAL
REVENUE CODE OF 1986 
 The undersigned taxpayer hereby elects, pursuant to Sections 55 and 83(b) of the Internal Revenue
Code of 1986, as amended, to include in taxpayer’s gross income or alternative minimum taxable income, as the case may be, for the current taxable year the amount of any compensation taxable to taxpayer in connection with taxpayer’s
receipt of the property described below: 
  

	1.	The name, address, taxpayer identification number and taxable year of the undersigned are as follows: 

  

									
		  	TAXPAYER:	  		    	SPOUSE:	    	
					
	NAME:	  		  		    		    	
					
	ADDRESS:	  		  		    		    	
					
	IDENTIFICATION NO.:	  		  		    		    	
					
	TAXABLE YEAR:	  		  		    		    	

  

	2.	The property with respect to which the election is made is described as follows:              shares (the
“Shares”) of the Common Stock of Turin Networks, Inc. (the “Company”). 

  

	3.	The date on which the property was transferred
is:                     ,        . 

  

	4.	The property is subject to the following restrictions: 

 The Shares may not be transferred and are subject to forfeiture under the terms of an agreement between the taxpayer and the Company. These restrictions lapse upon the satisfaction of certain conditions
contained in such agreement. 
  

	5.	The fair market value at the time of transfer, determined without regard to any restriction other than a restriction which by its terms will never lapse, of such
property is: $                    . 

  

	6.	The amount (if any) paid for such property is:
$                    . 

 The undersigned has submitted a copy of this statement to the person for whom the services were performed in connection with the undersigned’s receipt of the above-described property. The transferee
of such property is the person performing the services in connection with the transfer of said property. 
 The undersigned
understands that the foregoing election may not be revoked except with the consent of the Commissioner. 
  

							
	Dated:	 	                    ,
        	 		 	  

		 		 		 	Taxpayer

 The undersigned spouse of
taxpayer joins in this election. 
  

							
	Dated:	 	                    ,
        	 		 	  

		 		 		 	Spouse of Taxpayer

 EXHIBIT C-1 
 TURIN NETWORKS, INC. 
 1999 STOCK PLAN

 RESTRICTED STOCK PURCHASE AGREEMENT 
 THIS AGREEMENT is made between
                                         (the
“Purchaser”) and Turin Networks, Inc. (the “Company”) as of
                    ,        . 
 Unless otherwise defined herein, the terms defined in the 1999 Stock Plan shall have the same defined meanings in this Agreement. 
 RECITALS 
 A.        Pursuant to the exercise of the option granted to Purchaser under the Plan and pursuant to the Option Agreement
dated,                     by and between the Company and Purchaser with respect to such grant (the “Option”), which Plan and Option
Agreement are hereby incorporated by reference, Purchaser has elected to purchase              of those shares of Common Stock which have not become vested under the vesting schedule set
forth in the Option Agreement (“Unvested Shares”). The Unvested Shares and the shares subject to the Option Agreement which have become vested are sometimes collectively referred to herein as the “Shares.” 
 B.        As required by the Option Agreement, as a condition to Purchaser’s election to
exercise the option, Purchaser must execute this Agreement, which sets forth the rights and obligations of the parties with respect to Shares acquired upon exercise of the Option. 
 1.        Repurchase Option. 
   (a)        If Purchaser’s status as a Service Provider is terminated for any
reason, including for cause, death, and Disability, the Company shall have the right and option to purchase from Purchaser, or Purchaser’s personal representative, as the case may be, all of the Purchaser’s Unvested Shares as of the date
of such termination at the price paid by the Purchaser for such Shares (the “Repurchase Option”). 
   (b)        For purposes of this Agreement, Purchaser shall cease to be a Service Provider on the date upon which Purchaser ceases active performance of services for the Company.
Purchaser’s status as a Service Provider shall not include any period of notice of termination of employment, whether expressed or implied. The date Purchaser’s status as a Service Provider terminates shall be determined solely by this
Agreement and without reference to any other agreement, written or oral, including Purchaser’s contract of employment. 
   (c)        Upon the occurrence of such termination, the Company may exercise its Repurchase Option by delivering personally or by registered mail, to Purchaser (or his transferee or legal
representative, as the case may be), within ninety (90) days of the termination, a notice in writing indicating the Company’s intention to exercise the Repurchase Option and setting

  

 1 

 
forth a date for closing not later than thirty (30) days from the mailing of such notice. The closing shall take place at the Company’s office. At the closing, the holder of the
certificates for the Unvested Shares being transferred shall deliver the stock certificate or certificates evidencing the Unvested Shares, and the Company shall deliver the purchase price therefore. 
   (d)        At its option, the Company may elect to make payment for the Unvested Shares
to a bank selected by the Company. The Company shall avail itself of this option by a notice in writing to Purchaser stating the name and address of the bank, date of closing, and waiving the closing at the Company’s office. 
   (e)        If the Company does not elect to exercise the Repurchase Option conferred
above by giving the requisite notice within ninety (90) days following the termination, the Repurchase Option shall terminate. 
   (f)        The Repurchase Option shall terminate in accordance with the vesting schedule contained in Optionee’s Option Agreement. 
 2.        Transferability of the Shares; Escrow. 
   (a)        Purchaser hereby authorizes and directs the Secretary of the Company, or
such other person designated by the Company, to transfer the Unvested Shares as to which the Repurchase Option has been exercised from Purchaser to the Company. 
   (b)        To insure the availability for delivery of Purchaser’s Unvested Shares upon repurchase by the Company pursuant to the Repurchase Option
under Section 1, Purchaser hereby appoints the Secretary, or any other person designated by the Company as escrow agent, as its attorney-in-fact to sell, assign and transfer unto the Company, such Unvested Shares, if any, repurchased by the
Company pursuant to the Repurchase Option and shall, upon execution of this Agreement, deliver and deposit with the Secretary of the Company, or such other person designated by the Company, the share certificates representing the Unvested Shares,
together with the stock assignment duly endorsed in blank, attached hereto as Exhibit C-2. The Unvested Shares and stock assignment shall be held by the secretary in escrow, pursuant to the Joint Escrow Instructions of the Company and
Purchaser attached as Exhibit C-3 hereto, until the Company exercises its Repurchase Option, until such Unvested Shares are vested, or until such time as this Agreement no longer is in effect. As a further condition to the Company’s
obligations under this Agreement, the spouse of the Purchaser, if any, shall execute and deliver to the Company the Consent of Spouse attached hereto as Exhibit C-4. Upon vesting of the Unvested Shares, the escrow agent shall promptly
deliver to the Purchaser the certificate or certificates representing such Shares in the escrow agent’s possession belonging to the Purchaser, and the escrow agent shall be discharged of all further obligations hereunder; provided, however,
that the escrow agent shall nevertheless retain such certificate or certificates as escrow agent if so required pursuant to other restrictions imposed pursuant to this Agreement. 
   (c)        The Company, or its designee, shall not be liable for any act it may do or
omit to do with respect to holding the Shares in escrow and while acting in good faith and in the exercise of its judgment. 
  

 2 

   (d)        Transfer or sale of the
Shares is subject to restrictions on transfer imposed by any applicable state and federal securities laws. Any transferee shall hold such Shares subject to all the provisions hereof and the Exercise Notice executed by the Purchaser with respect to
any Unvested Shares purchased by Purchaser and shall acknowledge the same by signing a copy of this Agreement. 
 3.        Ownership, Voting Rights, Duties. This Agreement shall not affect in any way the ownership, voting rights or other rights or duties of Purchaser, except as specifically provided
herein. 
 4.        Legends. The share certificate evidencing the Shares issued
hereunder shall be endorsed with the following legend (in addition to any legend required under applicable federal and state securities laws): 
 THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN RESTRICTIONS UPON TRANSFER AND RIGHTS OF REPURCHASE AS SET FORTH IN AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH
IS ON FILE WITH THE SECRETARY OF THE COMPANY. 
 5.        Adjustment for Stock
Split. All references, to the number of Shares and the purchase price of the Shares in this Agreement shall be appropriately adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made by the Company
pursuant to Section 12 of the Plan after the date of this Agreement. 
 6.        Notices. Notices required hereunder shall be given in person or by registered mail to the address of Purchaser shown on the records of the Company, and to the Company at their
respective principal executive offices. 
 7.        Survival of Terms. This
Agreement shall apply to and bind Purchaser and the Company and their respective permitted assignees and transferees, heirs, legatees, executors, administrators and legal successors. 
 8.        Section 83(b) Election. Purchaser hereby acknowledges that he or she has
been informed that, with respect to the exercise of an Option for Unvested Shares, an election (the “Election”) may be filed by the Purchaser with the Internal Revenue Service, within 30 days of the purchase of the exercised Shares,
electing pursuant to Section 83(b) of the Code to be taxed currently on any difference between the purchase price of the exercised Shares and their Fair Market Value on the date of purchase. In the case of a Nonstatutory Stock Option, this
will result in a recognition of taxable income to the Purchaser on the date of exercise, measured by the excess, if any, of the Fair Market Value of the exercised Shares, at the time the Option is exercised over the purchase price for the exercised
Shares. Absent such an Election, taxable income will be measured and recognized by Purchaser at the time or times on which the Company’s Repurchase Option lapses. In the case of an Incentive Stock Option, such an Election will result in a
recognition of income to the Purchaser for alternative minimum tax purposes on the date of exercise, measured by the excess, if any, of the Fair Market Value of the

  

 3 

 
exercised Shares, at the time the option is exercised, over the purchase price for the exercised Shares. Absent such an Election, alternative minimum taxable income will be measured and
recognized by Purchaser at the time or times on which the Company’s Repurchase Option lapses. Purchaser is strongly encouraged to seek the advice of his or her own tax consultants in connection with the purchase of the Shares and the
advisability of filing of the Election under Section 83(b) of the Code. A form of Election under Section 83(b) is attached hereto as Exhibit C-5 for reference. 
 PURCHASER ACKNOWLEDGES THAT IT IS PURCHASER’S SOLE RESPONSIBILITY AND NOT THE COMPANY’S TO FILE TIMELY THE ELECTION UNDER SECTION
83(b) OF THE CODE, EVEN IF PURCHASER REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO MAKE THIS FILING ON PURCHASER’S BEHALF. 
 9.        Representations. Purchaser has reviewed with his own tax advisors the federal, state, local and foreign tax consequences of this investment and the transactions contemplated by this
Agreement. Purchaser is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Purchaser understands that he (and not the Company) shall be responsible for his own tax liability that may
arise as a result of this investment or the transactions contemplated by this Agreement. 
 10.      Governing Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law rules, of California. 
 Purchaser represents that he has read this Agreement and is familiar with its terms and provisions. Purchaser hereby agrees to accept as
binding, conclusive and final all decisions or interpretations of the Board upon any questions arising under this Agreement. 
  

 4 

 IN WITNESS WHEREOF, this Agreement is deemed made as of the date first set forth above.

  

					
	OPTIONEE	 		 	TURIN NETWORKS, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

		 		 	Title

 Residence Address 
 Date:                    ,
         
  

 5 

 EXHIBIT C-2 
 ASSIGNMENT SEPARATE FROM CERTIFICATE 
 FOR VALUE
RECEIVED I,                                     , hereby sell, assign
and transfer unto Turin Networks, Inc.
                                    
(            ) shares of the Common Stock of Turin Networks, Inc. standing in my name of the books of said corporation represented by Certificate
No.         herewith and do hereby irrevocably constitute and appoint                      to transfer the
said stock on the books of the within named corporation with full power of substitution in the premises. 
 This Stock
Assignment may be used only in accordance with the Restricted Stock Purchase Agreement between Turin Networks, Inc. and the undersigned dated
                    ,        . 
  

									
	Dated:	 	                    ,
        	 		 	Signature:	 	  

 INSTRUCTIONS: Please do not fill in any blanks other than the signature line. The purpose of this assignment is to enable the Company to
exercise its “repurchase option,” as set forth in the Agreement, without requiring additional signatures on the part of the Purchaser. 

 EXHIBITC-3 
 JOINT ESCROW INSTRUCTIONS 
 Corporate Secretary 
 Turin Networks, Inc. 
 1415 N. McDowell Boulevard

 Petaluma, CA 94954 
 Dear                         : 
 As Escrow Agent for both Turin Networks, Inc. (the “Company”), and the undersigned purchaser of stock of the Company (the “Purchaser”), you are hereby authorized and directed to hold
the documents delivered to you pursuant to the terms of that certain Restricted Stock Purchase Agreement (the “Agreement”) between the Company and the undersigned, in accordance with the following instructions: 
 1.        In the event the Company and/or any assignee of the Company (referred to collectively for
convenience herein as the “Company”) exercises the Company’s repurchase option set forth in the Agreement, the Company shall give to Purchaser and you a written notice specifying the number of shares of stock to be purchased, the
purchase price, and the time for a closing hereunder at the principal office of the Company. Purchaser and the Company hereby irrevocably authorize and direct you to close the transaction contemplated by such notice in accordance with the terms of
said notice. 
 2.        At the closing, you are directed (a) to date the stock
assignments necessary for the transfer in question, (b) to fill in the number of shares being transferred, and (c) to deliver the stock assignments, together with the certificate evidencing the shares of stock to be transferred, to the
Company or its assignee, against the simultaneous delivery to you of the purchase price (by cash, a check, or some combination thereof) for the number of shares of stock being purchased pursuant to the exercise of the Company’s repurchase
option. 
 3.        Purchaser irrevocably authorizes the Company to deposit with you
any certificates evidencing shares of stock to be held by you hereunder and any additions and substitutions to said shares as defined in the Agreement. Purchaser does hereby irrevocably constitute and appoint you as Purchaser’s attorney-in-fact
and agent for the term of this escrow to execute with respect to such securities all documents necessary or appropriate to make such securities negotiable and to complete any transaction herein contemplated, including but not limited to the filing
with any applicable state blue sky authority of any required applications for consent to, or notice of transfer of, the securities. Subject to the provisions of this paragraph 3, Purchaser shall exercise all rights and privileges of a
stockholder of the Company while the stock is held by you. 
 4.        Upon written
request of the Purchaser, but no more than once per calendar year, unless the Company’s repurchase option has been exercised, you will deliver to Purchaser a certificate or certificates representing so many shares of stock as are not then
subject to the Company’s repurchase option. Within 120 days after cessation of Purchaser’s continuous employment by or services to the Company, or any parent or subsidiary of the Company, you will deliver to Purchaser a certificate or
certificates representing the aggregate number of shares

 
held or issued pursuant to the Agreement and not purchased by the Company or its assignees pursuant to exercise of the Company’s repurchase option. 
 5.        If at the time of termination of this escrow you should have in your possession any
documents, securities, or other property belonging to Purchaser, you shall deliver all of the same to Purchaser and shall be discharged of all further obligations hereunder. 
 6.        Your duties hereunder may be altered, amended, modified or revoked only by a writing
signed by all of the parties hereto. 
 7.        You shall be obligated only for the
performance of such duties as are specifically set forth herein and may rely and shall be protected in relying or refraining from acting on any instrument reasonably believed by you to be genuine and to have been signed or presented by the proper
party or parties. You shall not be personally liable for any act you may do or omit to do hereunder as Escrow Agent or as attorney-in-fact for Purchaser while acting in good faith, and any act done or omitted by you pursuant to the advice of your
own attorneys shall be conclusive evidence of such good faith. 
 8.        You are
hereby expressly authorized to disregard any and all warnings given by any of the parties hereto or by any other person or corporation, excepting only orders or process of courts of law and are hereby expressly authorized to comply with and obey
orders, judgments or decrees of any court. In case you obey or comply with any such order, judgment or decree, you shall not be liable to any of the parties hereto or to any other person, firm or corporation by reason of such compliance,
notwithstanding any such order, judgment or decree being subsequently reversed, modified, annulled, set aside, vacated or found to have been entered without jurisdiction. 
 9.        You shall not be liable in any respect on account of the identity, authorities or rights of the parties executing or delivering or purporting to execute
or deliver the Agreement or any documents or papers deposited or called for hereunder. 
 10.      You shall not be liable for the outlawing of any rights under the Statute of Limitations with respect to these Joint Escrow Instructions or any documents deposited with you. 
 11.      You shall be entitled to employ such legal counsel and other experts as you may deem necessary
properly to advise you in connection with your obligations hereunder, may rely upon the advice of such counsel, and may pay such counsel reasonable compensation therefor. 
 12.      Your responsibilities as Escrow Agent hereunder shall terminate if you shall cease to be an officer or agent of the Company or if you shall resign by written notice
to each party. In the event of any such termination, the Company shall appoint a successor Escrow Agent. 
 13.      If you reasonably require other or further instruments in connection with these Joint Escrow Instructions or obligations in respect hereto, the necessary parties hereto shall join in furnishing such
instruments. 
 14.      It is understood and agreed that should any dispute arise with respect to
the delivery and/or ownership or right of possession of the securities held by you hereunder, you are

  

 2 

 
authorized and directed to retain in your possession without liability to anyone all or any part of said securities until such disputes shall have been settled either by mutual written agreement
of the parties concerned or by a final order, decree or judgment of a court of competent jurisdiction after the time for appeal has expired and no appeal has been perfected, but you shall be under no duty whatsoever to institute or defend any such
proceedings. 
 15.      Any notice required or permitted hereunder shall be given in writing and
shall be deemed effectively given upon personal delivery or upon deposit in the United States Post Office, by registered or certified mail with postage and fees prepaid, addressed to each of the other parties thereunto entitled at the following
addresses or at such other addresses as a party may designate by ten days’ advance written notice to each of the other parties hereto. 
 16.      By signing these Joint Escrow Instructions, you become a party hereto only for the purpose of said Joint Escrow Instructions; you do not become a party to the
Agreement. 
 17.      This instrument shall be binding upon and inure to the benefit of the
parties hereto, and their respective successors and permitted assigns. 
 18.      These Joint
Escrow Instructions shall be governed by the internal substantive laws, but not the choice of law rules, of California. 
  

					
	PURCHASER	 		 	TURIN NETWORKS, INC.
			
	  
	 		 	  

	Signature	 		 	By
			
	  
	 		 	  

		 		 	Title

 Residence Address 
 ESCROW AGENT 
  

	
	  

 Corporate Secretary 
  

 3 

 EXHIBIT C-4 
 CONSENT OF SPOUSE 
 I,
                                    , spouse of
                                    , have read and approve the
foregoing Restricted Stock Purchase Agreement (the “Agreement”). In consideration of granting of the right to my spouse to purchase shares of
                                        , as set
forth in the Agreement, I hereby appoint my spouse as my attorney-in-fact in respect to the exercise of any rights under the Agreement and agree to be bound by the provisions of the Agreement insofar as I may have any rights in said Agreement or any
shares issued pursuant thereto under the community property laws or similar laws relating to marital property in effect in the state of our residence as of the date of the signing of the foregoing Agreement. 
  

									
	Dated:	 	                    ,
        	 		 	Signature:	 	  

 EXHIBIT C-5 
 ELECTION UNDER SECTION 83(B) 
 OF THE INTERNAL
REVENUE CODE OF 1986 
 The undersigned taxpayer hereby elects, pursuant to Sections 55 and 83(b) of the Internal
Revenue Code of 1986, as amended, to include in taxpayer’s gross income or alternative minimum taxable income, as the case may be, for the current taxable year the amount of any compensation taxable to taxpayer in connection with
taxpayer’s receipt of the property described below: 
  

	1.	The name, address, taxpayer identification number and taxable year of the undersigned are as follows: 

  

											
	NAME:	    		  	TAXPAYER:	  		    	SPOUSE:	    	
						
	ADDRESS:	    		  		  		    		    	
		    		  		  		    		    	
					
	IDENTIFICATION NO.:	  		  		    		    	
					
	TAXABLE YEAR:	  		  		    		    	

  

	2.	The property with respect to which the election is made is described as follows:              shares (the
“Shares”) of the Common Stock of Turin Networks, Inc. (the “Company”). 

  

	3.	The date on which the property was transferred
is:                    ,         . 

  

	4.	The property is subject to the following restrictions: 

  

	5.	The Shares may not be transferred and are subject to forfeiture under the terms of an agreement between the taxpayer and the Company. These restrictions lapse upon the
satisfaction of certain conditions contained in such agreement. 

  

	6.	The fair market value at the time of transfer, determined without regard to any restriction other than a restriction which by its terms will never lapse, of such
property is: $            . 

  

	7.	The amount (if any) paid for such property is: $            . 

 The undersigned has submitted a copy of this statement to the person for whom the services were performed in connection with the
undersigned’s receipt of the above-described property. The transferee of such property is the person performing the services in connection with the transfer of said property. 

 The undersigned understands that the foregoing election may not be revoked except with
the consent of the Commissioner. 
  

							
	Dated:	 	                    ,
        	 		 	  

		 		 		 	Taxpayer

 The undersigned spouse of
taxpayer joins in this election. 
  

							
	Dated:	 	                    ,
        	 		 	  

		 		 		 	Spouse of Taxpayer

  

 2

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