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GLOSSARY GL-3
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AUDIX Standalone An AUDIX system that has no data link and allows AUDIX service to be
provided in association with any communications system but with less
functionality than when AUDIX is integrated via a data link with a
communications system. See also AUDIX.
Automatic Alternate
Routing (AAR)
A feature that provides optimum routing for private-network calls by
selecting, in descending order of desirability, the best route available.
Automatic Call
Distribution (ACD)
A feature that directs calls to agents who have been administered in groups
called splits. ACD uses the most-idle agent, direct, and circular (for
System 85 and DEFINITY Communications System Generic 2 only)
distribution methods. See also Enhanced Uniform Call Distribution,
and Uniform Call Distribution.
automatic calling unit
(ACU)
An automatic dialing device that enables a machine to place calls over a
communications system. Also called autodialer.
Automatic Route
Selection (ARS)
A feature that provides optimum routing for public-network calls by
selecting, in descending order of desirability, the best route available. See
also high-volume tandem.
AVD See alternate voice/data.
B-channel For an Integrated Services Digital Network (ISDN), a 64-kbps channel
accompanied by timing that is intended to carry a wide variety of digital
information streams, such as voice at 64 kbps, data at up to 64 kbps,
wideband voice encoded at 64 kbps, and voice at less than 64 kbps, alone
or combined with other digital information streams. Also called bearer
channel. See also D-channel and B-channel cut-through.
B-channel cut-through The side, either user or network, of the Integrated Services Digital
Network basic rate interface (ISDN-BRI) that the specified B-channel uses
to transfer voice or data information. See also B-channel.
bandwidth The difference, expressed in hertz, between the highest and lowest
frequencies in a range of frequencies that determine channel capacity.
basic rate interface (BRI) A standard Integrated Services Digital Network (ISDN) frame format that
specifies the protocol used between a communications system and a
terminal. BRI runs at 192 kbps and provides two 64-kbps voice or data
B-channels and one 16-kbps signaling and data D-channel per port. The
remaining 48 kbps are used for framing and D-channel contention.
baud In telecommunications applications, a unit of transmission speed equal to
the number of signal events per second. See also bit rate and bits per
second.