Introduction
Industry Standards
V.21
V.21 refers to a standard set by ITU-T for 300 bps Modem communications. North American manufactured modems usually follow the Bell 103 standard.
V.22
V.22 refers to the standard set by ITU-T for 1200 bps Modem communications. The V.22 standard is compatible with the Bell 212A standard used in North America.
V.22bis
V.22bis refers to the standards set by ITU-T for 2400 bps Modem communications.
V.23
V.23 refers to the standards set by ITU-T for 1200 bps Modem communications with a 75 bps back channel. V.23 is primarily used in the U.K.
V.32
V.32 refers to the standard set by ITU-T for 9600 and 4800 bps Modem communications.
V.32bis
V.32bis refers to the standard set by ITU-T for 14,400, 12,000, 9600, 7200, and 4800 bps Modem communications.
V.34
V.34 refers to the standard set by ITU-T for 28,800 to 2400 bps Modem communications.
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