AT&T MERLIN LEGEND Installation & Maintenance Manual page 689

Glossary
bipolar 8 zero substitution
(B8ZS)
A line-coding format that
encodes a string of 8 zeros
a unique binary sequence
using bipolar violation. See
also bipolar signsland
bipolar violation.
bipolar signal
A digital signal in which
pulses (ones) alternate
between positive and
negative. See also alternate
mark inversion, bipolar 8 zero
substitution, and bipolar
violation.
bipolar violation
A condition that occurs when
two positive or two negative
pulses are received in
succession. See also
alternate mark inversion,
bipolar 8 zero substitution,
and bipolar signal.
bit (binary digit)
One unit of information in
binary notation, having two
possible values: zero or one.
bit rate
The speed at which bits are
transmitted, usually
expressed in bits per second.
Also called data rate. See
also baud and bits per
second.
GL-4 Glossary
bits per second (bps)
The number of binary units of
information that are
in transmitted or received per
second. See also baud and
bit rate.
blocking
A condition in which end-to-
end connections cannot be
made on calls because of a
full load on all possible
services and facilities.
broadband
A transmission path having a
bandwidth greater than a
voice-grade channel.
bus
A multiconductor electrical
path used to transfer
information over a common
connection from any of
several sources to any of
several destinations.
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.
byte
A sequence of bits (usually
eight) processed together.
"Octet" is used instead of
"byte" in CClTT (International
Telegraph and Telephone
Consultative Committee)
documentation.