V.29 | Article about V.29 by The Free Dictionary
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V.29 (communications, standard)
V.29An ITU standard (1976) for synchronous 4,800, 7,200 and 9,600 bps full-duplex analog modems using QAM modulation on four-wire leased lines. It was adapted for Group 3 fax transmission over dial-up lines at 9,600 and 7,200 bps.