X.21
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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.
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X.21
An ITU standard protocol for a circuit switching network.Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.