V.23 | Article about V.23 by The Free Dictionary
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V.23 (protocol, standard)
V.23An ITU standard (1964) for asynchronous and synchronous 0-600 and 0-1,200 bps half-duplex analog modems for use on dial-up lines. It has an optional split-speed transmission method with a reverse channel of 0-75 bps (1,200/75, 75/1,200). It uses FSK modulation.