US Robotics COURIER - Page 197

COURIER HIGH SPEED MODEMS
V.22
A CCITT standard for modem communications at 1200 bps,
compatible with the Bell 212A standard observed in the U.S. and
Canada.
V.22 bis
V.23
V.25
A CCITT 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.
A CCITT standard for modem communications at 1200 bps with
a 75 bps back channel. Used in the U.K.
A CCITT standard for modem communications that specifies an
answer tone different from the Bell answer tone used in the U.S.
and Canada. All USRobotics modems can be set with the BO
command so that they use the V.25 2100 Hz tone when answer-
ing overseas calls.
V.27 ter
V.29
V.32
A CCITT standard for facsimile operations that specifies
modulation at 4800 bps, with fallback to 2400 bps.
A CCITT standard for facsimile operations that specifies
modulation at 9600 bps, with fallback to 7200 bps.
A CCITT 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.32 bis
A CCITT standard that extends the V.32 connection range: 4800,
7200, 9600, 12K and 14.4K bps. V.32 bis 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.
G-12 Glossary
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-