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  September  30, 2005, 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 operation of
          the  Corporation.


November 7, 2005


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


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