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Glossary
Bearer-channel
See B-channel.
Behind Switch mode
One of three modes of system operation, in which the
binary code
bipolar 8 zero
substitution
bipolar signal
control unit is connected to (behind) another telephone
switching system, such as Centrex or DEFINITY, which
provides features and services to telephone users. See
also Hybrid/PBX mode and Key mode.
Electrical representation of quantities or symbols
expressed in the base-2 number system, which includes
zeros and ones.
See B8ZS.
Digital signal in which pulses (ones) alternate between
BIS
bit
bit rate
blocking
BMI
board
positive and negative. See also AMI, B8ZS, and bipolar
violation.
bipolar violation
Condition occurring when two positive or two negative
pulses are received in succession. See also AMI and
B8ZS.
(Built-in Speakerphone) Part of the model name of some
analog multiline telephones.
(binary digit) One unit of information in binary notation; it
can have one of two values, zero or one.
Speed at which bits are transmitted, usually expressed in
bps. Also called “data rate.” See also baud rate.
Condition in which end-to-end connections cannot be
made on calls because of a full load on all possible
services and facilities. See also glare.
(Broadcast Music Incorporated)
A module, for example, 100D or 408 MLX GS/LS, that
allows you to connect lines/trunks and extensions to the
communications system or holds the processor or power
supply*
Maintenance and Troubleshooting GL-5