EXHIBIT 32.1

                 CERTIFICATE PURSUANT TO 18 U.S.C. SECTION 1350,
                    AS ADOPTED PURSUANT TO SECTION 906 OF THE
                           SARBANES-OXLEY ACT OF 2002


     Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and in connection
with the Quarterly Report on Form 10-Q of Concurrent Computer Corporation (the
"Corporation") for the quarter ended March 31, 2007, as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), the
undersigned, the President and Chief Executive Officer of the Corporation
certifies that:

     (1)  The Report fully complies with the requirements of Section 13(a)
          or 15(d) of the Securities Exchange Act of 1934; and

     (2)  The information contained in the Report fairly presents, in all
          material respects, the financial condition and results of operations
          of the Corporation.


Date: May 7, 2007


                                   /s/ T. Gary Trimm
                                   -----------------------------
                                   T. Gary Trimm
                                   President and Chief Executive Officer
                                   (Principal Executive Officer)