Source : Free On-Line Dictionary of Computing

Compressed SLIP
     
         (CSLIP) {VanJacobsen TCP header compression}.  A
        version of {SLIP} using {compression}.  CSLIP has no effect on
        the data portion of the {packet} and has nothing to do with
        compression by {modem}.  It does reduce the {TCP} header from
        40 bytes to 7 bytes, a noticeable difference when doing
        {telnet} with lots of little packets.  CSLIP has no effect on
        UDP, only TCP.
     
        (1995-05-28)