User`s manual

U.S. Robotics I-modem Command Reference
Glossary • Page G-46
V.29
An ITU-T standard for facsimile operations that speciÞes 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, and fall forward again to 9600 bps
when line quality improves.
V.32bis
An ITU-T standard that extends the V.32 connection range: 4800, 7200, 9600, 12K, and
14.4 Kbps. V.32bis modems fall back to the next lower speed when line quality is
impaired, and fall back further as necessary. They fall forward to the next higher speed
when line quality improves.
V.32terbo
Modulation scheme that extends the V.32 connection range: 4800, 7200, 9600, 12000,
14400, 16800, 19200, and 21600 bps. V.32terbo modems fall back to the next lower speed
when line quality is impaired, and fall back further as necessary. They fall forward to the
next higher speed when line quality improves.