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COMSPHERE 3900 Series Modems
Glossary-8 September 1998 3910-A2-GN32-40
An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at
1200 or 2400 bps over the dial network (PSTN).
An ITU-T standard dialing protocol that permits direct and stored-number dialing in
asynchronous, bisynchronous, or HDLC modes.
An ITU-T communications standard for modems operating in synchronous mode at 4800 or
2400 bps.
An ITU-T communications standard for modems operating half-duplex with synchronous data at
7200 and 9600 bps.
An ITU-T standard for modems operating full-duplex with asynchronous or synchronous data at
4800 or 9600 bps on switched (dial) or leased telephone lines.
An ITU-T 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.
A modulation that adds the 19,200 bps and 16,800 bps data rates to the V.32bis data rates. It is
a proprietary modulation, not an ITU-T standard.
AnITU-T standard for error control protocol.
An ITU-T standard for data compression.
An ITU-T standard for local and remote diagnostic loopback tests.
Voice Frequency. The part of the audio frequency range used to transmit voice sound (usually
300 Hz to 3400 Hz). This band is used by the modem for its modulated signal.
A character that tells the DTE or modem to stop transmitting data.
A character that tells the DTE or modem to start or resume transmitting data.
V.22bis
V.25bis
V.27bis
V.29
V.32
V.32bis
V.32terbo
V.42
V.42bis
V.54
VF
XOFF
XON