US Robotics Sportster Operating Instructions Manual page 128

V.17 fax
An ITU-T standard for making facsimile
connections at 14,400 bps, ,12,000 bps,
9,600 bps, 7,200 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.
V.22 bis
An ITU-T standard for modem
communications at 2400 bps. The standard
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includes an automatic link negotiation fallback
to 1200 bps and compatibility with Bell
212A/V.22 modems.
V.27 ter
An ITU-T standard for facsimile operations
that specifies modulation at 4800 bps, with
fallback to 2400 bps.
V.29
An ITU-T standard for facsimile operations
that specifies modulation at 9600 bps, with
fallback to 7200 bps.
V.32
An ITU-T standard for modem
communications at 9600 bps and 4800 bps.
V.32 modems fall back to 4800 bps when line
quality is impaired.