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  Annual  Report  on  Form 10-K of Concurrent Computer Corporation (the
"Corporation")  for  the  year ended June 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 operations
          of  the  Corporation.


September 2, 2005


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