US Robotics 002605-00 Installation Manual page 108

V.22 bis
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.27
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.
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LOSSARY
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.
V.32 bis
An ITU-T standard that extends the V.32
connection range: 4800, 7200, 9600, 12,000,
and 14,400 bps. V.32 bis modems fall back to
the next lower speed when line quality is
impaired, fall back further as necessary, and
also fall forward (switch back up) when line
conditions improve (see online fall back/fall
forward).
V.34
An ITU-T standard that currently allows data
rates as high as 33,600 bps.