V.42bis

from The Free On-line Dictionary of Computing (8 July 2008)

V.42bis

   <communications, standard> An extension of the {ITU-T} {V.42}
   standard {modem} {protocol} to included {compression} using a
   {Lempel-Ziv} related technique, which detects frequently
   occurring character strings and replaces them with tokens.
   This is similar to the {Unix} {compress} utility.  Typical
   {compression} for text is 50% or better; with nearly 20% gain
   from {synchronous} conversion this gives reduces transmission
   time by almost 60%.

   [Details?  On-line spec?]

   (2004-08-02)