V.34

(protocol)An ITU-T standard modem serial lineprotocol using symbol rates of 2400, 2743, 2800, 3000,>3200 and 3429 and up to 28800 bits per second.

The official V.34 draft recommendation was titled:

Modem operating at data signalling rates of up to 28 800bit/s for use on the general switched telephone network andon leased point-to-point 2-wire telephone-type circuits.

During the lengthy process of approval by ITU-T, manymanufacturers released 28.8 kbps modems described as "V.FAST".The V.34 recommendation was ratified by ITU-T on 20September 1994. Rockwell and US Robotics both have seatson the ITU-T, and have both released chip set/BIOScombinations that they feel will meet V.34. V.34 modems willalso support V.FC if the manufacturer currently supportsV.FC (e.g. Rockwell). Some (all?) V.34 modems will alsosupport line probing.

ITU document.

V.34

An ITU standard (1994) for 28,800 bps and (1996) 31,200 and 33,600 bps analog modems using QAM modulation. Before V.34, AT&T's V.32terbo and Rockwell International's V.FC modems came on the market to provide greater speed than the V.32bis 14,400 bps standard. After V.34 was standardized at 28.8 Kbps, subsequent enhancements that raised speeds to 33.6 Kbps were folded back into V.34, and there was no change in number or designation.