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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Glossary
Page GL-4
barrier code Password used to limit access to the
Remote Access
feature of the system. In a
private network
, it is especially
important that barrier codes be required for all types of
remote access.
basic carrier Hardware that holds and connects the
processor module
,
power supply module
, and up to five other modules in the
system. See also
expansion carrier
.
baud rate Strictly speaking, a measurement of transmission speed
equal to the number of signal level changes per second. In
practice, often used synonymously with
bit rate
and
bps
.
B-channel (Bearer-channel) 64- or 56-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
.
Basic Rate
Interface
See
BRI
.
Bearer-channel See
B-channel
.
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.”
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)