What is X.25? - Definition from Whatis.com

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X.25

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X.25

The X.25 protocol, adopted as a standard by the Consultative Committee for International Telegraph and Telephone (CCITT), is a commonly-used network protocol. The X.25 protocol allows computers on different public networks (such as CompuServe, Tymnet, or a TCP/IP network) to communicate through an intermediary computer at the network layer level. X.25's protocols correspond closely to the data-link and physical-layer protocols defined in the Open Systems Interconnection (OSI) communication model.

Related glossary terms: RS-232C, encoder, akamaize, small form factor (SFF), MDI/MDIX (medium dependent interface/MDI crossover), BOC (Bell operating company), MBone (Multicast Internet), Peltier effect, V.90, H.323

This was last updated in June 1997

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