3Com U.S. Robotics 56K Winmodem Manual page 50

V.8
The ITU-T standard specification that
covers the initial handshaking process.
V.17 fax
An ITU-T standard for making facsimile
connections at 14,400 bps, 12,000 bps,
9600 bps, and 7200 bps.
V.21
An ITU-T standard for modems operating
in asynchronous mode at speeds up to 300
bps, full-duplex, on public switched
telephone networks.
V.22
An ITU-T standard for modem
communications at 1200 bps, compatible
with the Bell 212A standard observed in the
U.S. and Canada.
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V.22bis
An ITU-T standard for modem
communications at 2400 bps. The standard
includes an automatic link negotiation
fallback to 1200 bps and compatibility with
Bell 212A/V.22 modems.
V.23
An ITU-T standard for modem
communication at 1200 bps with a 75 bps
back channel. This standard is used in the
U.K.
V.27ter
An ITU-T standard for facsimile
operations that specifies modulation at 4800
bps, with fallback to 2400 bps.