US Robotics Sportster Operating Instructions Manual page 129

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 28,800 bps.
V.34+
An enhancement to V.34 that enables data
transfer rates as high as 33,600 bps.
G
LOSSARY
V.42
An ITU-T standard for modem
communications that defines a two-stage
process of detection and negotiation for
LAPM error control.
V.42 bis
An extension of ITU-T V.42 that defines a
specific data compression scheme for use
during V.42 connections.
Xmodem
The first of a family of error control software
protocols used to transfer files between
modems. These protocols are in the public
domain and are available from many bulletin
board services.
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