Glossary

X.21 bis ‹ (Packet data networking) International recommendation that defines the most popular physical interface for X.25. Equivalent to RS-232 and V.24.

X.21 (bis) link ‹ Commonly used in European countries, this is a pay as you go link. When a signal is raised, the network automatically establishes a link to the remote unit.

X.25 ‹ Packet switching protocol that lets computers communicate via wide area packet switched data networks

XID ‹ See exchange identification.

5536 PRI RAS Communications Controller Users Guide

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