Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Glossary
Page GL-6
Behind Switch
mode
One of three modes of system operation, in which
the 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
.
binary code Electrical representation of quantities or symbols
expressed in the base-2 number system, which
includes zeros and ones.
bipolar 8 zero
substitution
See B8ZS.
bipolar signal Digital signal in which pulses (ones) alternate
between 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.
BIS (Built-In Speakerphone) Part of the model name of
some analog multiline telephones.
bit (binary digit) One unit of information in binary
notation; it can have one of two values, zero or one.
bit rate Speed at which bits are transmitted, usually
expressed in bps. Also called “data rate.”
See also
baud rate.
blocking 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 .
BMI (Broadcast Music Incorporated)