V.29

V.29

(communications, standard)An ITU-T modem protocol whichallows 9600 bps half duplex or four wire communicationswith fall back to 7200 bps and 4800 bps. V.29 is usedby fax machines.

V.29

An 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.