g4

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

Group 4
G4

   <protocol, compression> (G4) The {CCITT} fax {protocol} which
   uses data {compression} and allows a variety of file types
   (e-mail, pictures, {PostScript}, etc.) to be transmitted over
   digital ({ISDN}) telephone lines.

   The Group 4 protocol was published by {CCITT} in 1993.  Full
   details of the protocol are available from {ITU-T}.

   See also {Group 3}.

   (1998-09-10)