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X.21
(redirected from X.21bis)

    Also found in: Wikipedia 0.02 sec.

X.21

An ITU standard protocol for a circuit switching network.

(communications, standard)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.


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