Document:

Amendment to Loan Documents

 Exhibit 10.1 
 AMENDMENT TO LOAN DOCUMENTS 
 THIS AMENDMENT TO LOAN DOCUMENTS (this
“Amendment” or the “January 2011 Amendment”) is entered into as of January 19, 2011 (the “January 2011 Amendment Date”) by and between, on the one hand, SILICON VALLEY BANK, a California corporation (“Bank”),
and, on the other hand, ZTI Merger Subsidiary III, Inc., a Delaware corporation formerly known as Zhone Technologies, Inc. (“ZMS-III”, and also a “Borrower”), and Zhone Technologies, Inc., a Delaware corporation formerly known as
Tellium, Inc. (“Zhone”, and also a “Borrower”) (individually and collectively, and jointly and severally, “Borrower”). Borrower’s chief executive office is located at 7195 Oakport Street, Oakland, CA 94621.

 RECITALS 
 A. Bank and Borrower are parties to that certain Second Amended and Restated Loan and Security Agreement with an Effective Date of March 16, 2009 (as amended, modified, supplemented or
restated, the “Non-Exim Loan Agreement”) in effect between Bank and Borrower, and that certain Loan and Security Agreement (EXIM FACILITY) with an Effective Date of March 16, 2009 (as amended, modified, supplemented or restated, the
“Exim Loan Agreement”) in effect between Bank and Borrower. As used herein, the term “Loan Agreement” means, individually and collectively, the Non-Exim Loan Agreement and the Exim Loan Agreement. Each of the terms “January
2011 Amendment” and “January 2011 Amendment Date,” as respectively defined above, hereby is incorporated into the Loan Agreement. 
 B. Bank has extended credit to Borrower for the purposes permitted in the Loan Agreement. 
 C. Borrower has requested that Bank amend the Loan Agreement to waive the Designated Defaults (as defined in Section 2.1 below) as more fully set forth herein. 

D. Bank has agreed to so amend the Loan Agreement, but only to the extent, in accordance with the terms, subject to the conditions
and in reliance upon the representations and warranties set forth below. 
 AGREEMENT

 NOW, THEREFORE, in consideration of the foregoing recitals and other good and valuable
consideration, the receipt and adequacy of which is hereby acknowledged, and intending to be legally bound, the parties hereto agree as follows: 
 1. Definitions. Capitalized terms used but not defined in this Amendment shall have the meanings given to them in the Loan Agreement. 

  
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 2. Amendments to Loan Documents. 

2.1 Limited Waiver of Designated Defaults. Borrower has advised Bank that Borrower anticipates that it will fail to comply with the
Required EBITDA for any Fiscal Quarter Financial Covenant set forth in Section 6.9(b) of the Non-Exim Loan Agreement for the compliance period ending December 31, 2010 (the “Non-Exim Designated Default”). Borrower has also
advised Bank that Borrower anticipates that it will fail to comply with the Required EBITDA for any Fiscal Quarter Financial Covenant set forth in Section 6.9(b) of the Exim Loan Agreement for the compliance period ending December 31, 2010
(the “Exim Designated Default” and together with the Non-Exim Designated Default, the “Designated Defaults”). Bank and Borrower agree that the Designated Defaults are hereby waived. It is understood by the parties hereto,
however, that such waiver does not constitute a waiver of any other provision or term of either the Non-Exim Loan Agreement, the Exim Loan Agreement or any related document, nor a waiver of this covenant as of any other date, nor an agreement to
waive in the future this covenant or any other provision or term of the Non-Exim Loan Agreement, the Exim Loan Agreement or any related document. 
 3. Limitation of Amendments. 
 3.1 The amendments set forth in
Section 2, above, are effective for the purposes set forth herein and shall be limited precisely as written and shall not be deemed to (a) be a consent to any amendment, waiver or modification of any other term or condition of any
Loan Document, or (b) otherwise prejudice any right or remedy which Bank may now have or may have in the future under or in connection with any Loan Document, as amended. 
 3.2 This Amendment shall be construed in connection with and as part of the Loan Documents and all terms, conditions, representations, warranties, covenants and agreements set forth in the Loan
Documents (as amended by this Amendment, as applicable) are hereby ratified and confirmed and shall remain in full force and effect. 
 4. Representations and Warranties. To induce Bank to enter into this Amendment, Borrower hereby represents and warrants to Bank as follows: 

4.1 Immediately after giving effect to this Amendment, (a) the representations and warranties contained in the Loan Documents
are true, accurate and complete in all material respects as of the date hereof (except to the extent such representations and warranties relate to an earlier date, in which case they are true and correct as of such date), and (b) no Event of
Default has occurred and is continuing; 
 4.2 Borrower has the power and authority to execute and deliver this Amendment
and to perform its obligations under the Loan Documents, as amended by this Amendment; 
 4.3 The certificate of
incorporation of Borrower delivered to Bank on the Effective Date remain true, accurate and complete and have not been otherwise amended, supplemented or restated and are and continue to be in full force and effect; 

  
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 4.4 The execution, delivery and performance by Borrower of this Amendment have been
duly authorized, and do not (i) conflict with any of Borrower’s organizational documents, (ii) contravene, conflict with, constitute a default under or violate any material Requirement of Law, (iii) contravene, conflict or
violate, in any material respect, any applicable order, writ, judgment, injunction, decree, determination or award of any Governmental Authority by which Borrower or any its Subsidiaries or any of their property or assets (other than immaterial
property and immaterial assets) may be bound or affected, (iv) require any action by, filing, registration, or qualification with, or Governmental Approval from, any Governmental Authority (except such Governmental Approvals which have already
been obtained and are in full force and effect), or (v) constitute an event of default under any material agreement by which Borrower is bound; and 
 4.5 This Amendment has been duly executed and delivered by Borrower and is the binding obligation of Borrower, enforceable against Borrower in accordance with its terms, except as such
enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting creditors’ rights. 

5. Release by Borrower and Guarantor. Each of Borrower and Guarantor (individually and collectively, “Obligor”) hereby
agree as follows: 
 5.1 FOR GOOD AND VALUABLE CONSIDERATION, Obligor hereby forever relieves, releases, and discharges
Bank and its present or former employees, officers, directors, agents, representatives, attorneys, and each of them, from any and all claims, debts, liabilities, demands, obligations, promises, acts, agreements, costs and expenses, actions and
causes of action, of every type, kind, nature, description or character whatsoever, whether known or unknown, suspected or unsuspected, absolute or contingent, arising out of or in any manner whatsoever connected with or related to facts,
circumstances, issues, controversies or claims existing or arising from the beginning of time through and including the date of execution of this Amendment (collectively “Released Claims”). Without limiting the foregoing, the
Released Claims shall include any and all liabilities or claims arising out of or in any manner whatsoever connected with or related to the Loan Documents, the Recitals hereto, any instruments, agreements or documents executed in connection with any
of the foregoing or the origination, negotiation, administration, servicing and/or enforcement of any of the foregoing. 

5.2 In furtherance of this release, Obligor expressly acknowledges and waives any and all rights under Section 1542 of the
California Civil Code, which provides as follows: 
 “A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR
DOES NOT KNOW OR EXPECT TO EXIST IN HIS OR HER FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN BY HIM OR HER MUST HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR.” (Emphasis added.) 

  
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 5.3 By entering into this release, Obligor recognizes that no facts or
representations are ever absolutely certain and it may hereafter discover facts in addition to or different from those which it presently knows or believes to be true, but that it is the intention of Obligor hereby to fully, finally and forever
settle and release all matters, disputes and differences, known or unknown, suspected or unsuspected; accordingly, if Obligor should subsequently discover that any fact that it relied upon in entering into this release was untrue, or that any
understanding of the facts was incorrect, Obligor shall not be entitled to set aside this release by reason thereof, regardless of any claim of mistake of fact or law or any other circumstances whatsoever. Obligor acknowledges that it is not relying
upon and has not relied upon any representation or statement made by Bank with respect to the facts underlying this release or with regard to any of such party’s rights or asserted rights. 

5.4 This release may be pleaded as a full and complete defense and/or as a cross-complaint or counterclaim against any action,
suit, or other proceeding that may be instituted, prosecuted or attempted in breach of this release. Obligor acknowledges that the release contained herein constitutes a material inducement to Bank to enter into this Amendment, and that Bank would
not have done so but for Bank’s expectation that such release is valid and enforceable in all events. 
 5.5 Obligor
hereby represents and warrants to Bank, and Bank is relying thereon, as follows: 
 (a) Except as expressly stated in
this Amendment, neither Bank nor any agent, employee or representative of Bank has made any statement or representation to Obligor regarding any fact relied upon by Obligor in entering into this Amendment. 

(b) Obligor has made such investigation of the facts pertaining to this Amendment and all of the matters appertaining thereto, as
it deems necessary. 
 (c) The terms of this Amendment are contractual and not a mere recital. 

(d) This Amendment has been carefully read by Obligor, the contents hereof are known and understood by Obligor, and this
Amendment is signed freely, and without duress, by Obligor. 
 (e) Obligor represents and warrants that it is the sole
and lawful owner of all right, title and interest in and to every claim and every other matter which it releases herein, and that it has not heretofore assigned or transferred, or purported to assign or transfer, to any person, firm or entity any
claims or other matters herein released. Obligor shall indemnify Bank, defend and hold it harmless from and against all claims based upon or arising in connection with prior assignments or purported assignments or transfers of any claims or matters
released herein. 

  
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 6. Fee. In consideration for Bank entering into this Amendment, Borrower shall pay
Bank a fee in the mutually agreed amount of $10,000.00, which fee shall be earned in full and payable concurrently with the execution and delivery of this Amendment. Such fee shall be non-refundable and in addition to all interest and other fees
payable to Bank under the Loan Documents. Bank is authorized to charge such fee to Borrower’s loan account. 
 7. Bank
Expenses. Borrower shall pay to Bank, when due, all Bank Expenses (including reasonable attorneys’ fees and expenses), when due, incurred in connection with or pursuant to this Amendment. 

8. Counterparts. This Amendment may be executed in any number of counterparts and all of such counterparts taken together shall be
deemed to constitute one and the same instrument. 
 9. Effectiveness. This Amendment shall be deemed effective upon the
due execution and delivery by each party hereto to Bank of this Amendment. 
 [Remainder of page intentionally left blank;
signature page immediately follows.] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed and delivered as of the date first written above. 
  

									
	BANK:	 		 	BORROWER:
			
	Silicon Valley Bank	 		 	 ZTI MERGER SUBSIDIARY III, INC., a
 Delaware corporation

					
	By	 	 /s/ Mike Meier
	 		 	By	 	 /s/ Kirk Misaka

	Name	 	Mike Meier	 		 	Name	 	Kirk Misaka
	Title	 	Relationship Manager	 		 	Title	 	Chief Financial Officer
				
		 		 		 	 ZHONE TECHNOLOGIES, INC., a
 Delaware corporation

					
		 		 		 	By	 	 /s/ Kirk Misaka

		 		 		 	Name	 	Kirk Misaka
		 		 		 	Title	 	Chief Financial Officer

  
 Signature Page

 CONSENT 
 Each of the undersigned hereby expressly agrees to Section 5 of the foregoing Amendment and acknowledges that its consent to the rest of the foregoing Amendment is not required, but the undersigned
nevertheless does hereby agree and consent to the entire foregoing Amendment and to the documents and agreements referred to therein and to all future modifications and amendments thereto, and any termination thereof, and to any and all other
present and future documents and agreements between or among the foregoing parties. Nothing herein shall in any way limit any of the terms or provisions of the Guaranty, the Guarantor Security Agreement, or any other Loan Documents, executed by the
undersigned, all of which are hereby ratified and affirmed. 
  

									
		 		 	GUARANTOR:
			
	 Paradyne Corporation
	 		 	Paradyne Networks, Inc.
					
	By	 	 /s/ Kirk Misaka
	 		 	By	 	 /s/ Kirk Misaka

	Name	 	Kirk Misaka	 		 	Name	 	Kirk Misaka
	Title	 	Chief Financial Officer	 		 	Title	 	Chief Financial Officer
			
	Premisys Communications, Inc.	 		 	Xybridge Technologies, Inc.
					
	By	 	 /s/ Kirk Misaka
	 		 	By	 	 /s/ Kirk Misaka

	Name	 	Kirk Misaka	 		 	Name	 	Kirk Misaka
	Title	 	Chief Financial Officer	 		 	Title	 	Chief Financial Officer
				
	Zhone Technologies International, Inc.	 		 		 	
					
	By	 	 /s/ Kirk Misaka
	 		 		 	
	Name	 	Kirk Misaka	 		 		 	
	Title	 	Chief Financial Officer	 		 		 	

  
 Signature Page2010 Class 2 Regular Employee Stock Purchase Plan

 Exhibit 4.3 
 Schedule D 
 PCL EMPLOYEES HOLDINGS LTD. 

REGULAR EMPLOYEE STOCK PURCHASE PLAN 
 CLASS 2 SERIES ‘10 COMMON NON-VOTING SHARES 
 1. Establishment of
Plan. PCL Employees Holdings Ltd. (the “Company”), proposes to sell shares of its Class 2 Series ‘10 Common Non-Voting Shares (the “Plan Shares”) to Eligible Employees (as defined below) pursuant to this Employee Stock
Purchase Plan (the “Plan”). 
 2. Purpose; Nature of Plan. 

(a) The purpose of this Plan is to provide Eligible Employees with a means of acquiring an equity interest in the Company.
Because the Company’s shares are not publicly traded and are generally nontransferable except to the Company, Eligible Employees do not have an opportunity to acquire an equity interest in the Company except by purchasing directly from the
Company. The Company, by means of the Plan, seeks to enhance the Eligible Employees’ sense of participation in the affairs of the Company and its subsidiaries, and to provide an incentive for such Eligible Employees to exert maximum efforts for
the success of the Company. 
 (b) It is the Company’s practice to determine annually the number, if any,
and type of equity interests to be offered to Salaried Employees (as defined below) in that year and to adopt one or more employee stock purchase plans pursuant to which such equity interests will be offered in that year. Those plans generally are
of two types: (i) “Universal Plans” under which shares are offered to certain specified Salaried Employees, up to a specified aggregate maximum number of shares, and (ii) “Regular Plans” under which shares are offered
to certain Salaried Employees approved by the Chief Executive Officer of the Company (the “CEO”), the number and class of shares being offered to each such employee being determined by the CEO, based on criteria determined by the board of
directors of the Company (the “Board”), including position, performance and existing share ownership. This Plan is a Regular Plan. References in this Plan to “Universal Plans” mean all Universal Plans heretofore or hereafter
adopted by the Company and references to “Regular Plans” mean this Plan and all other Regular Plans heretofore or hereafter adopted by the Company. The shares of stock offered each year are identified by a Series designation that indicates
the year of issuance and a Class designation that indicates whether such shares are voting or nonvoting and whether such shares were offered in Canada or the United States. The Class designations are as follows: 

 

			
	 Class 1
	  	Non-Voting/U.S.
	 Class 2
	  	Non-Voting/Canada
	 Class 3
	  	Voting/U.S.
	 Class 4
	  	Voting/Canada

 References in this Plan to “Common
Shares” includes all of the Company’s common shares of all Series and Classes heretofore or hereafter authorized or issued. 

 3. Shares Available for Issuance. A total of 3,300,000 Plan Shares are available for
issuance under this Plan. Such number shall be subject to adjustment upon the occurrence of certain events described in Section 10 of this Plan. 
 4. Administration. This Plan shall be administered as directed by the Board, unless and until the Board delegates administration of the Plan to a committee appointed by the Board. As used in this
Plan, references to the “Board” shall include any such committee, if such a committee has been established. Subject to the provisions of this Plan, all questions of interpretation or application of this Plan shall be determined by the
Board and its decisions shall be final and binding upon all participants. All expenses incurred in connection with the administration of the Plan shall be paid by the Company. 
 5. Eligibility; Participation in the Plan. 
 (a) Definitions

 i. “Eligible Employee” means a Salaried Employee who has been designated by the CEO, in the
CEO’s discretion, as eligible to participate in the Plan. 
 ii. “Salaried Employee” means an
employee of the Company or any of its subsidiaries, other than a student, who is paid a salary and not a wage based on an hourly or other periodic basis. 
 (b) The Company shall offer Eligible Employees the opportunity to purchase Plan Shares under this Plan on one occasion or more during 2010. The number and class of shares to be offered to each Eligible
Employee shall be approved by the CEO, in the CEO’s discretion, having regard to criteria determined by the Board from time to time, including position, performance and existing share ownership. The Company shall establish such forms and
procedures as it deems appropriate for making that offer and for the acceptance of that offer by Eligible Employees who elect to purchase. The CEO shall have the authority, in his sole discretion, to modify or waive compliance by any Eligible
Employee with any such procedures. 
 6. Purchase Price. The purchase price per share at which shares of Common Stock
will be sold pursuant to this Plan shall be determined by the Board in accordance with Section XI of the PCL Employees Holdings Ltd. Unanimous Shareholder Agreement, as amended from time to time (the “Shareholder Agreement”). 

7. Payment of Purchase Price; Issuance of Shares. 

(a) The purchase price for shares purchased under the Plan shall be paid on the purchase date by check drawn on a Canadian
financial institution or by bank draft, in each case, payable to the Company in Canadian funds. The CEO shall have the authority, in his sole discretion, to modify the means of payment of the purchase price (but not the amount of the purchase price
or the timing of its payment) by any Eligible Employee. 
 (b) As promptly as practicable after the purchase
date, the Company shall issue Plan Shares for the participant’s benefit representing the shares purchased. 

  
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 8. Use of Proceeds. Proceeds from the sale of shares of Common Stock pursuant to this
Plan shall constitute general funds of the Company. 
 9. Termination of Employment. If a participant’s employment
by the Company or any of its subsidiaries is terminated for any reason, including disability or death, prior to the actual issuance of a certificate for any shares, such participant’s rights to purchase Plan Shares shall immediately terminate
and any funds received by the Company for the purchase of the shares shall promptly be returned to the participant (or to his or her estate). For purposes of this Section 9, employment of a participant by the Company or any of its subsidiaries
will not be deemed to have terminated in the event of (a) a transfer from the Company to any subsidiary of the Company or from any subsidiary of the Company to the Company or any other subsidiary, or (b) sick leave, military leave, or any
other leave of absence approved by the Board. 
 10. Capital Changes. The number of Plan Shares which have been
authorized for issuance under this Plan but have not yet been issued and the purchase price per share shall be proportionately adjusted for any stock split, stock dividend (but only in the form of Common Shares), recapitalization, combination or any
other increase or decrease in the number of issued and outstanding Common Shares affected without receipt of any consideration by the Company. Such adjustment shall be made by the Board, whose determination shall be final, binding and conclusive.

 11. Nonassignability. No rights to purchase or receive Common Shares under this Plan may be assigned, transferred,
pledged or otherwise disposed of in any way by the participant. Any attempt to assign, transfer, pledge or otherwise dispose of such rights shall be void and without effect. 
 12. Shareholder Agreement; Restriction on Transfer. No participant may purchase shares under this Plan unless and until such participant has signed the Shareholder Agreement and agreed to be bound
by the terms and conditions thereof. The shares purchased pursuant to this Plan are subject to the restrictions on transfer and ownership and the repurchase rights of the Company set forth in the Shareholder Agreement. Shares may not be transferred
except in compliance with all applicable laws, including, without limitation, Canadian and United States securities laws. In addition to any legend required by the Shareholder Agreement, all certificates evidencing shares issued to employees shall
bear any legends which, in the Board’s judgment, are necessary to comply with applicable securities laws. 
 13.
Reports. Within a reasonable time after the end of each fiscal year, the Company shall prepare and distribute a year-end report to its shareholders, which report shall include consolidated financial statements of the Company and its
subsidiaries for the fiscal year. 
 14. Limitation of Rights. Neither this Plan nor the grant of the right to purchase
shares hereunder shall confer any right on any employee to remain in the employ of the Company or any subsidiary of the Company, or restrict the right of the Company or any of its subsidiaries to terminate such employee’s employment. In
addition, no participant shall have any rights as a shareholder of the Company with respect to any Plan Shares awarded to the participant under this Plan until the date shares have been issued to the participant. 

  
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 15. Notices. All notices or other communications by a participant under or in
connection with the Plan shall be given as provided in the Shareholder Agreement. 
 16. Term; Shareholder Approval. This
Plan shall become effective on the date on which it is adopted by the Board. This Plan shall be approved by the shareholders of the Company, in any manner permitted by applicable corporate law, within 12 months after the date this Plan is adopted by
the Board. This Plan shall continue until the first to occur of (a) termination of this Plan by the Board (which termination may be effected by the Board at any time) or (b) the end of the Company’s 2010 fiscal year. 

17. Applicable Law. The Plan shall be governed by the substantive laws (excluding the conflict of laws rules) of the Province of
Alberta, Canada. 
 18. Amendments or Termination of this Plan. The Board may, at any time, amend, terminate or extend
the term of this Plan, except no amendment may be made without approval of the shareholders of the Company before or within 12 months after the adoption of such amendment if such amendment would: (a) increase the number of shares that may be
issued under this Plan, or (b) extend the term of this Plan. 

  
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