X.21
A digital signaling interface recommended by ITU-T that includes specifications for DTE/DCE physical interface elements, alignment of call control characters and error checking, elements of the call control phase for circuit switched services, data transfer at up to 2 Mbps, and test loops. 64 kbps is the most commonly used transfer rate.
Last updated: 2000-02-28
Nearby terms:
X11R6 ♦ X.12 ♦ X2 ♦ X.208 ♦ X.209 ♦ X.21 ♦ X.214 ♦ X.215 ♦ X.216 ♦ X.217 ♦ X.219
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