X.25

X.25 definition - telecom
The ITU-T Recommendation for the interface into a packet-switched network, X.25 was published in 1976, and subsequently revised several times, most recently in 1993. X.25 actually is a protocol suite comprising three layers that map into the bottom three layers of the OSI Reference Model:

Webster's New World Telecom Dictionary Copyright © 2008 by Wiley Publishing, Inc., Indianapolis, Indiana.
Used by arrangement with John Wiley & Sons, Inc.

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