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Glossary
GL-33910-A2-GN32-30 November 1996
CCITT An advisory committee (Consultative Committee on International
Telephone and T
elegraph) established by the United Nations to
recommend communications standards and policies.
CCITT V
.22 A standard for modems operating full-duplex over dial networks at
1200 bps.
CCITT V
.22bis A standard for modems operating full-duplex over leased lines or
dial networks at 2400 bps.
CCITT V
.27bis A standard for modems operating over leased lines at 2400 or 4800
bps.
CCITT V.29 A standard for modems operating over leased lines at 4800, 7200,
or 9600 bps.
CCITT V
.32 A standard for modems operating full-duplex with asynchronous
or synchronous data over leased lines or dial networks at 4800 or
9600 bps.
CCITT V
.32bis A standard for modems operating full-duplex with asynchronous
or synchronous data over leased lines or dial networks at 4800,
7200, 9600, 12000, or 14400 bps.
CCITT V
.42 CCITT standard for error control protocol.
CCITT V
.42bis CCITT standard for data compression.
CCITT V
.54 CCITT standard for local and remote diagnostic loopback tests.
channel A path for electrical transmission between two or more points.
Also called a circuit, line, link, path, or facility.
character A letter, figure, number, punctuation, or other symbol.
character echo
A way to check the accuracy of data transmission by sending to the
monitor (displaying) all the characters being transmitted.
circuit pack lock A screw lock tab installed over a circuit card’
s latch release tab to
prevent the unit from being removed without a tool. It is used on
SDUs, modems, and filler panels.
Command mode One of two modem operating modes. When in Command mode,
the modem accepts commands instead of transmitting or receiving
data.
configuration area One of five areas within the Configure branch containing modem
settings. Configuration areas include Active (Operating), Active
(Saved), Customer 1, Customer 2, and Factory.
configuration option Modem software that sets specific operating parameters for the
modem. Sometimes referred to as straps.
connector
An outlet on equipment and cables that provides a connection.