AT&T MERLIN LEGEND Reference page 144

Glossary
A
adjunct
Optional equipment used with the communications
system, such as an alerting device that connects to a
multiline telephone or to a telephone jack.
analog transmission
A mode of transmission in which information is
represented in continuously variable physical
quantities such as amplitude, frequency, phase, or
resistance. See also digital transmission,
application
Software and/or hardware that adds functional
capabilities to the communications system, For
example, the Call Management System (CMS) is a
DOS-based application that simulates the actions of a
system operator by answering calls and distributing
them to individual telephones.
Automatic Route Selection (ARS)
Routes calls over outside trunks according to the
number dialed and the trunks available,
B
B-channel
A 64-kbps channel that carries a 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.
Behind Switch mode
A mode of operation in which the communications
system control unit is connected to (is "behind")
another communications system.
billing number (BN)
A number provided by the central office and is used for
billing information.
button
A key on the face of a telephone or console that is
used to access a line, activate a feature, or enter a
code on a communications system,
C
calling group
A team of agents who answer the same types of calls.
calling party number (CPN)
A number that identifies the originator of a call and is
provided either by the originating customer premises
equipment or by the originating central office.
Calling Party Number/Billing Number (CPN/BN)
A BRI feature in which the number of the originator of
an outside call is transmitted over a BRI line to the
MERLIN LEGEND system. Each incoming call to the
system over a BRI line can be the CPN/BN of the
calling party.
channel
A telecommunications transmission path for voice
and/or data.
communications system
A communications system that provides voice and/or
data communications services, including access to
public and private networks, for telephones and data
terminals on a customer's premises.
control unit
The housing, carriers, power supply, processor, and
modules of a communications system,
D
D-channel
A D-channel (data channel) monitors and controls B-
channel communication and initializes ISDN lines. It
conveys the signaling that sets up, maintains, and
clears calls. Each D-channel has a capacity of 16
Kbps.
dial-out code
A code (usually a 9) dialed by telephone users with
System Access buttons to get an outside line.
G L - 1