X.21

<communications, standard>

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:

X11R6X.12X2X.208X.209X.21X.214X.215X.216X.217X.219

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