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

Try this search on Wikipedia, OneLook, Google

Nearby terms:

X2 « X.208 « X.209 « X.21 » X.214 » X.215 » X.216

Loading