X.25

from The Free On-line Dictionary of Computing (8 July 2008)
X.25
ISO 8208

   <protocol, standard> An {ITU-T} {standard} {protocol} suite
   for the {DTE}-{DCE} interface in a {packet-switched} network,
   approved by {ISO}.  X.25 defines standard {physical layer},
   {data link layer} and {network layers} (layers 1 through 3).
   It was developed to describe how data passes into and out of
   public data communications networks.  X.25 networks are in use
   throughout the world.

   Document: {ISO} 8208.

   Several other {ITU-T} recommendations are relevant to {packet
   switching}: {X.3}, {X.28}, {X.29}, {X.75}.

   (1996-08-10)