SIXTH AMENDMENT TO LOAN AND SECURITY AGREEMENT AND LIMITED WAIVER

Exhibit 10.40

SIXTH AMENDMENT TO LOAN AND SECURITY AGREEMENT AND LIMITED WAIVER

This Sixth Amendment to Loan and Security Agreement and Limited Waiver (this “Amendment”) is entered into as of October 19, 2007, by and between Greater Bay Venture Banking, a division of Greater Bay Bank, N.A. (“Bank”) and ANDA NETWORKS, INC. (“Borrower”).

RECITALS

Borrower and Bank are parties to that certain Loan and Security Agreement dated as of September 3, 2004, as amended (the “Agreement”). One or more Events of Default have occurred under the Agreement by virtue of Borrower’s failure to comply with Section 6.9 of the Agreement as of certain dates. Borrower and Bank desire to amend and waive certain provisions of the Agreement, all in accordance with the terms of this Amendment.

NOW, THEREFORE, the parties agree as follows:

1. Waiver. Bank hereby waives Borrower’s obligation to comply with Section 6.9 of the Agreement for the quarter ending March 31, 2007. Such waiver does not constitute a waiver (i) of compliance with those sections as of any other dates, (ii) of any other failure by Borrower to comply with the Agreement or any other Events of Default, now existing or hereafter arising, or (iii) Bank’s right to require compliance at all times with the terms and conditions of the Agreement. Bank reserves all rights under the Agreement and under applicable law.

2. Amendments to Agreement. The Agreement is hereby amended as follows:

(a) The following defined terms in Section 1.1 are amended to read as follows:

“Nonformula Maturity Date” means January 3, 2008.

“Revolving Maturity Date” means January 3, 2008.

(a) receipt by the Bank of the following (each of which shall be in form and substance satisfactory to Bank):

(i) counterparts of this Amendment duly executed on behalf of the Borrower and the Bank;

(ii) copies of resolutions of the Board of Directors or other authorizing documents of Borrower, authorizing the execution and delivery of this Amendment;

(b) Bank shall have received a loan facility fee in the amount of Five Thousand Dollars ($5,000), plus an amount equal to all Bank Expenses incurred in connection with this Amendment; and

(c) completion of such other matters and delivery of such other agreements, documents and certificates as Bank may reasonably request.

4. Representation and Warranties. Borrower represents and warrants that the Representations and Warranties contained in the Agreement are true and correct as of the date of this Amendment, and that after giving effect to this Amendment, no Event of Default has occurred and is continuing.

5. MISCELLANEOUS.

(a) Successors and Assigns. This Amendment shall be binding upon and shall inure to the benefit of Borrower and Bank and their respective successors and assigns; provided, however, that the foregoing shall not authorize any assignment by Borrower of its rights or duties hereunder.

(b) Entire Agreement. This Amendment and the Loan Documents contain the entire agreement of the parties hereto and supersede any other oral or written agreements or understandings.

(c) Course of Dealing; Waivers. No course of dealing on the part of Bank or its officers, nor any failure or delay in the exercise of any right by Bank, shall operate as a waiver thereof, and any single or partial exercise of any such right shall not preclude any later exercise of any such right. Bank’s failure at any time to require strict performance by Borrower of any provision

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shall not affect any right of Bank thereafter to demand strict compliance and performance. Any suspension or waiver of a right must be in writing signed by an officer of Bank.

(d) Legal Effect. Except as amended by this Amendment, the Loan Documents remain in full force and effect. If any provision of this Amendment conflicts with applicable law, such provision shall be deemed severed from this Amendment, and the balance of this Amendment shall remain in full force and effect. Unless otherwise defined, all capitalized terms in this Amendment shall have the meaning set forth in the Agreement.

(e) Counterparts. This Amendment may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one instrument.

IN WITNESS WHEREOF, the undersigned have executed this Amendment as of the first date above written.

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CORPORATE RESOLUTIONS TO BORROW

I, the undersigned Secretary or Assistant Secretary of ANDA NETWORKS, INC. (the “Corporation”), HEREBY CERTIFY that the Corporation is organized and existing under and by virtue of the laws of the State of Delaware.

I FURTHER CERTIFY that the Certificate of Incorporation and Bylaws previously delivered to Greater Bay Venture Banking, a division of Greater Bay Bank, N.A. (the “Bank”) remain in full force and effect and have not been amended, restated or modified.

I FURTHER CERTIFY that at a meeting of the Directors of the Corporation duly called and held, at which a quorum was present and voting (or by other duly authorized corporate action in lieu of a meeting), the following resolutions were adopted.

BE IT RESOLVED, that any one (1) of the following named officers, employees, or agents of this Corporation, whose actual signatures are shown below:

acting for and on behalf of this Corporation and as its act and deed be, and they hereby are, authorized and empowered:

Borrow Money. To borrow from time to time from Greater Bay Venture Banking, a division of Greater Bay Bank, N.A., on such terms as may be agreed upon between the officers, employees, or agents and Bank, such sum or sums of money as in their judgment should be borrowed.

Execute Documents. To execute and deliver to Bank the Sixth Amendment to Loan and Security Agreement and Limited Waiver dated as of October 19, 2007, (the “Amendment”), and also to execute and deliver to Bank one or more renewals, extensions, modifications, refinancings, consolidations, or substitutions for one or more of the notes, or any portion of the notes.

Grant Security. To grant a security interest to Bank in the Collateral described in the Loan Agreement, which security interest shall secure all of the Corporation’s Obligations, as described in the Loan Agreement.

Negotiate Items. To draw, endorse, and discount with Bank all drafts, trade acceptances, promissory notes, or other evidences of indebtedness payable to or belonging to the Corporation or in which the Corporation may have an interest, and either to receive cash for the same or to cause such proceeds to be credited to the account of the Corporation with Bank, or to cause such other disposition of the proceeds derived therefrom as they may deem advisable.

Letters of Credit; Foreign Exchange. To execute letters of credit applications, foreign exchange agreements and other related documents pertaining to Bank’s issuance of letters of credit and foreign exchange contracts.

Further Acts. In the case of lines of credit, to designate additional or alternate individuals as being authorized to request advances thereunder, and in all cases, to do and perform such other acts and things, to pay any and all fees and costs, and to execute

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and deliver such other documents and agreements as they may in their discretion deem reasonably necessary or proper in order to carry into effect the provisions of these Resolutions.

BE IT FURTHER RESOLVED, that any and all acts authorized pursuant to these resolutions and performed prior to the passage of these resolutions are hereby ratified and approved, that these Resolutions shall remain in full force and effect and Bank may rely on these Resolutions until written notice of their revocation shall have been delivered to and received by Bank. Any such notice shall not affect any of the Corporation’s agreements or commitments in effect at the time notice is given.

I FURTHER CERTIFY that the officers, employees, and agents named above are duly elected, appointed, or employed by or for the Corporation, as the case may be, and occupy the positions set forth opposite their respective names; that the foregoing Resolutions now stand of record on the books of the Corporation; and that the Resolutions are in full force and effect and have not been modified or revoked in any manner whatsoever.

IN WITNESS WHEREOF, I have hereunto set my hand on October 19, 2007 and attest that the signatures set opposite the names listed above are their genuine signatures.

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