EXHIBIT A
JOINT FILING AGREEMENT

SCHEDULE 13G
JOINT FILING AGREEMENT

     This Agreement is dated as of November 30, 2009 by and among Mercury Fund VIII, Ltd., (“Mercury VIII”), Mercury Fund IX, Ltd., (“Mercury IX”), Mercury Ventures II, Ltd. (“Mercury Ventures II”), Mercury Management, L.L.C. (“Mercury Management”) and Kevin C. Howe (“Mr. Howe”).

     WHEREAS, pursuant to paragraph (k)(1) of Rule 13d-1 promulgated under Section 13d(1) of the Securities Exchange Act of 1934, as amended (the “Act”), the parties hereto have decided to satisfy their filing obligations under the Act by a single joint filing.

     NOW, THEREFORE, the undersigned do hereby agree as follows:

     1. The Schedule 13G (the “Schedule 13G”) with respect to Concurrent Computer Corporation, a Delaware corporation, to which this Agreement is attached as Exhibit A is filed on behalf of Mercury VIII, Mercury IX, Mercury Ventures II, Mercury Management and Mr. Howe. Mercury VIII, Mercury IX, Mercury Ventures II and Mercury Management hereby authorize Mr. Howe to file the Schedule 13G on their behalf.

     2. Each of Mercury VIII, Mercury IX, Mercury Ventures II, Mercury Management and Mr. Howe is responsible for the completeness and accuracy of the information concerning such person or entity contained therein; provided that each person or entity is not responsible for the completeness or accuracy of the information concerning any other person or entity making such filing.

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     IN WITNESS WHEREOF, the undersigned hereunto set their hands as of the date first above written.

MERCURY FUND VIII, LTD.
By:	MERCURY VENTURES II, LTD.
	General Partner
	By:	MERCURY MANAGEMENT, L.L.C.
		General Partner
		By: Name:	/s/ Kevin C. Howe Kevin C. Howe
		Title:	Manager
MERCURY FUND IX, LTD.
By:	MERCURY VENTURES II, LTD.
	General Partner
	By:	MERCURY MANAGEMENT, L.L.C.
		General Partner
		By: Name:	/s/ Kevin C. Howe Kevin C. Howe
		Title:	Manager
MERCURY VENTURES II, LTD.
By:		MERCURY MANAGEMENT, L.L.C.
		General Partner
		By: Name:	/s/ Kevin C. Howe Kevin C. Howe
		Title:	Manager
MERCURY MANAGEMENT, L.L.C.
By:	/s/ Kevin C. Howe
Name:	Kevin C. Howe
Title:	Manager
/s/ Kevin C. Howe
Name: Kevin C. Howe