Definition of V21

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v21

v.21 an itu-t modem protocol for 300 bits per second two-wire full-duplex communications using frequency shift keying modulation.


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V21 Definition from Encyclopedia Dictionaries & Glossaries

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ITU-T V-Series Recommendations
This article details the ITU-T V-Series Recommendations for protocols that govern approved modem communication standards and interfaces.

Note: the bis and ter suffixes are ITU-T standard designators of successive iterations of a standard. (bis and ter are French terms for second and third alternate versions of an item.)


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