G
LOSSARY
7-6
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 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.
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.
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.
V.90
The
ITU-T
standard for 56 Kbps modem communications. This
technology
Содержание 3CP5613
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