AT&T MERLIN LEGEND Release 3.1, System Programming Manual

Page: 851 / 887

Glossary
GL–4
System Programming
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)
board A module, for example, 100D or 408 MLX GS/LS, that
allows you to connect lines/trunks and extensions to the
communication system.
board assignment SPM procedure for assigning line/trunk and extension
modules to slots on the control unit.
board renumbering System programming procedure for renumbering boards
that have already been assigned to specific slots on the
control unit.
BRI (Basic Rate Interface) Standard digital frame format that
specifies the protocol between the communication system
and a terminal. BRI runs at 192 Kbps and provides two
64-Kbps voice or B-channels and on 16-Kbps signaling or
D-channel per port. The remaining 48 Kbps are used for
framing and D-channel contention.
broadband Transmission path having a bandwidth greater than a
voice-grade channel.
BTMI (basic telephone modem interface)