x.21

X x

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- US Pronunciation
- US IPA

- US Pronunciation
- US IPA

Definition of x.21 word

noun Technical meaning of 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. 1

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