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User’s Guide and Reference 1 - 5
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.22
bis
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.32
bis
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.