Document:

Offer Letter dated August 16, 2006

 Exhibit 10.1 
 August 16, 2006 
 Mr. William J. Stuart 
 Dear Bill:

 It is a distinct pleasure to offer you the position of Senior Vice President of Finance and Chief Financial Officer with Avici Systems Inc. (the
“Company”). In this capacity you will report to me. Your starting bi-weekly base salary will be $10,769.24, which annualized is $280,000. In addition, you will be eligible to participate in the Company’s Executive Incentive Plan at a
target of 35% of your annual base pay. The Company will also offer you a sign-on bonus of $60,000.00, payable after 120 days of employment. 
 In this role,
you will be considered an “executive officer” of the Company as that term is used in rules and regulations proscribed by the Securities and Exchange Commission (the “SEC”). Consequently, you will be responsible for compliance
with all SEC rules and regulations applicable to executive officers. 
 At all times during the term of your employment, the Company shall maintain director
and officer liability insurance in such amounts and under such terms as approved by the Company’s board of directors. The Company also acknowledges that in your role as Chief Financial Officer, you are deemed an officer of the Company and,
accordingly, are entitled to indemnification for your actions undertaken in the scope of your employment with the Company in accordance with, and subject to, the Company’s Certificate of Incorporation. 
 Subject to the terms and conditions of the Company’s 2000 Stock Option and Incentive Plan, as may be amended from time to time, and subject to approval by the
Company’s board of directors, you will be granted an option to purchase 65,000 shares of Avici common stock with an exercise price per share equal to 15% above the closing price of the common stock on the date of grant (or, if not a trading
day, on the next trading date). The shares covered by this option will vest over four years, with 25% of the shares vesting on the first anniversary of the vesting start date and the remaining shares vesting on a monthly basis at a rate of 2.0833%
per month. 
 Subject to approval by the Company’s board of directors and the terms and conditions set forth in a Restricted Stock Agreement to be
executed by the Company and you, you will also receive a grant, in the form of restricted stock, of 35,000 shares of the Company’s common stock. The purchase price for these shares of restricted stock will be an amount equal to $0.01 per share,
for an aggregate purchase price of $350 and are subject to the vesting schedule as set forth in the applicable restricted stock agreement. 
 You will be
covered for 12 months of severance pay and benefits under the terms of the attached severance agreement. 

 The Company strives to offer a competitive employee benefit program. Your participation in this program will be subject
to the standard eligibility requirements for all Company employees. The Company’s benefits are described in the enclosed document titled “Avici’s 2006 Benefits Summary for Full-Time Employees”. The Company offers three medical
insurance plans to choose from, Blue Cross/Blue Shield of New England-HMO, Value Plus and Blue Cross/Blue Shield-PPO. Other benefits include Delta Dental plan with orthodontia coverage, a Fidelity 401(k) program, a pre-tax medical and dependent care
program, a vision plan, life insurance, supplemental life insurance, short and long-term disability benefits, an Employee Stock Purchase Plan, a legal assistance program, and other optional programs. Avici will provide you vacation (20 days per
year, which will accrue monthly) and holidays (10 days plus 1 floater). Please note that the Company reserves the right to change, modify or discontinue any of its current benefits plans, providers and policies in the future. 
 In accordance with federal law, you will be asked to provide documentation proving your eligibility to work in the United States. Please bring proper documentation on
your first day of work. This can be a U.S. Passport or a driver’s license and birth certificate or social security card. 
 Please confirm
your acceptance of this employment offer by signing one copy of this letter, which will indicate your acceptance of our offer as well as your anticipated start date, and return it to me. If you wish to fax a copy to me, please send it directly to
the Human Resources office at 978-964-2650. 
 Please understand that this offer does not constitute a contract of employment for any particular period or a
guarantee of continued employment. Our relationship is one of voluntary, “at will” employment. While we hope our relationship will be mutually beneficial, it should be recognized that you will retain your right to terminate your employment
at any time for any reason and that the Company will retain the same right. In accepting this offer, you represent that you have not relied upon any agreements or representations, written or oral, express or implied, with respect to your employment
that are not expressly set forth in this letter. 
 Employment with Avici is subject to your signing the Company’s Invention, Non-disclosure and
Non-Compete Agreement. Note that this agreement is enclosed for your review prior to accepting this offer. 
 This offer expires as of the close of business
on Friday, August 18, 2006. This offer supercedes all prior offers, both verbal and written. 

 Bill, I am very pleased by the prospect of you joining the Avici team and I am sure that you will play an important role
in the future success of the Company. 
 Sincerely, 
 William
Leighton 
 President and CEO 
 Avici Systems Inc. 
 I have carefully reviewed this offer of employment and agree that it sets forth the entire understanding between the Company and me. I also understand that my employment
at the Company is “at-will” which means that either the Company or I can terminate the employment relationship at any time, either with or without cause or notice. 
  

											
	Accepted by:	 	  
	 		 		 	Date:	 	  

	  
 Start Date:
	 	  
	 		 		 		 	

  

			
	Enclosures:	  	2006 Benefits Summary for Full-Time Employees
		  	Invention, Non-disclosure and Non-Compete Agreement
		  	I-9 Form
		  	BC/BS HMO and PPO Plan Descriptions
		  	Delta Dental Plan Description
		  	2000 Stock Option and Incentive Plan
		  	2000 ESPP PlanSeverance Pay Agreement

 Exhibit 10.2 
 SEVERANCE PAY AGREEMENT 
 This agreement is entered into by and between Avici Systems Inc. (the “Company”)
and William J. Stuart (“you”) effective as of August 28, 2006. 
 SEVERANCE PAY 
 You will receive severance pay if you are terminated from employment with the Company without Cause or if you resign for Good Reason. 
 The amount of the severance pay will be twelve (12) months of your base salary at the rate in effect on your separation date, less applicable taxes. In addition,
you will continue to be eligible to participate in the Company’s group health, dental, and vision insurance plans, and, to the fullest extent permitted by the plans and applicable law, the Company’s 401k plan and the Company-paid life
insurance plan, at the levels in effect on your separation date, for up to twelve (12) months. During this continuation period, the Company will pay the same percentage of your monthly group health, dental, vision, and life insurance premiums
that it pays for active employees. At the end of the twelve (12) month period, you will, to the fullest extent permitted by the plans and applicable law, be eligible to continue your group health, dental, and vision coverage for up to an
additional eighteen (18) months under COBRA. If you elect COBRA coverage you will be solely responsible for the full premium amounts. 
 To receive
severance pay, you will be required to sign a release of claims in a form reasonably acceptable to the Company. Severance pay will be paid in accordance with the Company’s regular payroll practices beginning promptly after your signed release
of claims goes into effect. 
 STOCK OPTIONS 
 If you are terminated without Cause prior to a Change of Control, the vesting of your remaining unvested Company options will accelerate by six (6) months. 
 In the event of a Change of Control, you will receive accelerated vesting on 50% of your remaining unvested options. 
 If, in connection with or following a Change of Control, you are terminated without Cause or you resign for Good Reason, the vesting on all of your remaining unvested
options will be accelerated such that 100% of your options will become fully vested. 
 DEFINITIONS; OTHER

 A termination for “Cause” as used herein means your being terminated by the Company due to (a) willful misconduct or violation of
Company policy which causes material harm to the Company, (b) willful breach of an employment or other agreement with the Company which causes material harm to the Company, or (c) being convicted of any felony. 
 A resignation for “Good Reason” as used herein means you resign because, following or at the time of a Change of Control, (a) you are transferred
to a lesser position or suffer a material reduction in responsibility; (b) your compensation is decreased; (c) you are required to relocate 

 more than fifty (50) miles from your work location immediately prior to the Change of Control; or (d) you are
excluded from any material compensatory or benefit plan or arrangement made available to similarly situated employees of the acquiring party. 
 “Change of Control” as used herein means the closing of (a) the sale of the Company by merger, consolidation or purchase of outstanding capital stock in which the shareholders of the Company, as such, no longer own a
majority of the outstanding equity securities of the Company or its successor; (b) any sale of all or substantially all of the assets of the Company, other than in a spin-off or similar transaction; or (c) any other acquisition or
disposition of the business or assets of the Company, as determined by the Board. 
 Assignment. This agreement will be binding on and inure to the
benefit of the parties and the Company’s successors and assigns. 
 Employment at Will. This agreement is not an employment contract. Nothing in
this agreement modifies your status as an employee at will or guarantees employment for any length of time. 
 Entire Agreement; Modification; Governing
Law. Except as otherwise provided herein, this agreement constitutes the only agreement between you and the Company with respect to the subject matter hereof, superseding in all respects any and all prior oral or written agreements or
understandings pertaining to the subject matter hereof. This agreement may be amended or modified only in a writing signed by both you and the Company. Any dispute concerning this agreement will be governed by the internal laws of Massachusetts.

  

			
	 AVICI SYSTEMS INC., by:
	 	             WILLIAM J. STUART

  

			
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