US Robotics USR5610B User Manual page 66

60 C 5: G
HAPTER L OSSA RY
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 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.