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Meaning of X.21

 
Computing Dictionary
 
 Definition: 

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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