Source : Free On-Line Dictionary of Computing

centum call second
     
         (CCS) A unit used (in North America) to quantify the
        total traffic running in a network.  1 CCS is 100
        call-seconds.  That means 1 CCS could be 2 calls of 50 seconds
        duration or 20 calls of 5 seconds duration.
     
        (2002-03-25)