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,  2006,  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 5, 2006


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