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An ITU-T standard modem serial line protocol 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 28 800 bit/s for use on the general switched telephone network and on leased point-to-point 2-wire telephone-type circuits.

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

ITU document.


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.
References in periodicals archive ?
V34 Custom Interiors, James Valenzuela, 4602 River Road.
Frequency of Author Name and Source Rank Being Cited 1 72 KLUGMAN KP, 1990, V3, P171, CLIN MICROBIOL REV 2 45 MARTON A, 1991, V163, P542, J INFECT DIS 3 41 JACOBS MR, 1978, V299, P735, NEW ENGL J MED 4 38 FENOLL A, 1991, V13, P56, REV INFECT DIS 5 34 HANSMAN D, 1967, V2, P264, LANCET 6 33 APPELBAUM PC, 1992, V15, P77, CLIN INFECT DIS 7 32 SPIKA JS, 1991, V163, P1273, J INFECT DIS 8 28 PALLARES R, 1987, V317, P18, NEW ENGL J MED 9 26 APPELBAUM PC, 1987, V6, P367, EUR J CLIN MICRO 9 26 WARD J, 1981, V3, P254, REV INFECT DIS 10 25 JORGENSEN JH, 1990, V34, P2075, ANTIMICROB AGE 10 25 MUNOZ R, 1991, V164, P302, J INFECT DIS 10 25 PHILIPPON A, 1989, V33, P1131, ANTIMICROB AGEN
With V34 Data transfer rates of up to 36,600bps, it costs pounds 179 from Dixons, The Link, PC World, Byte and Currys
The Linux layer supports a palette of DSP functions including modules for a V34 modem, G723.
Noosh V34 includes new functionality, including Open Bid and a Vendor Rating System based on GE's Six Sigma technology.
The Voice HyperModem - Model AM2814IV-HY supports V34 / V.