V.22bis

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V.22bis

(protocol, standard)
V.22 twice. An ITU-T modem protocol which allowed a data rate of 2400 bits per second, twice that of V.22.
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V.22bis

An ITU standard (1984) for asynchronous and synchronous 2,400 bps full-duplex analog modems for use on dial-up lines and two-wire leased lines, with fallback to V.22 1,200 bps operation. V.22bis uses QAM modulation.
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