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Glossary
Glossary-93980-A2-GB30-20 November 1996
V.22 A standard for modems operating full-duplex with asynchronous or synchronous data at
1200 bps over the dial network (PSTN).
V.22bis A standard for modems operating full-duplex with asynchronous or synchronous data at
1200 or 2400 bps over the dial network (PSTN).
V.27bis A communications standard for modems operating in synchronous mode at 4800 or
2400 bps.
V.27ter A fax communications standard for modems operating half-duplex with synchronous
data at 2400 and 4800 bps.
V.29 A communications standard for modems operating half-duplex with synchronous data at
7200 and 9600 bps.
V.32 A standard for modems operating full-duplex with asynchronous or synchronous data at
4800 or 9600 bps on switched (dial) or leased telephone lines.
V.32bis A standard for modems operating full-duplex with asynchronous or synchronous data
over dial networks (PSTN) or leased lines at 14,400, 12,000, 9600, 7200, or 4800 bps.
V.32terbo A proprietary standard for modems operating full-duplex with asynchronous or
synchronous data over dial networks (PSTN) or leased lines at 19,200 or 16,800 bps. The
terbo is a pun on turbo and ter; the next iteration of the V.32 recommendation, had one
been finalized, would have been V
.32 ter.
V.33 A communications standard for modems operating half-duplex with synchronous data at
14,400 and 12,000 bps.
V.34 A standard for modems operating full-duplex with asynchronous or synchronous data
over dial networks (PSTN) or two-wire leased lines at 28,800, 26,400, 24,000, 21,600,
19,200, 16,800, 14,400, 12,000, 9600, 7200, 4800, or 2400 bps.
V.42 CCITT standard for error control protocol.
V.42bis CCITT standard for data compression.
V.54 CCITT standard for local and remote diagnostic loopback tests.
XOFF A character that tells the DTE or modem to stop transmitting data.
XON A character that tells the DTE or modem to start or resume transmitting data.