Issue 2 - 07/00 A4-3
Appendix 4—Glossary & Abbreviations
BERT Bit Error Rate Test. Determines the probability of a single
bit being misinterpreted over a defined period of time. The
test synchronises and compares the received pattern with a
transmitted binary test pattern, and counts the errors.
Bit A binary digit, which can be in a state of either '0' or '1'.
BRI Basic Rate ISDN.
CCITT The former name of the ITU-T (from French acronym).
Channel A path (either physical or logical) for transmission of
information.
Channel Signalling in which information relating to the traffic
Associated carried by a channel is transmitted in the channel itself or
Signalling in a signalling channel permanently associated with it.
Circuit A link connecting two or more nodes.
Circuit A type of network where a circuit is established and
switching maintained between the communicating parties for the
duration of the call.
Clear Cause A code indicating the reason why a call has cleared.
CLI Calling Line Identity. The number belonging to the caller.
Clock An electronically generated periodic signal which provides
a timing reference to the transmitted data or other circuit
functions.
Closed User A group to and from which access is restricted. Members
Group can communicate with each other, and sometimes also
with users outside the group.
CO Central Office. A central switching or control centre
belonging to a PTT.
Codec Coder/Decoder. An analogue to digital converter.
COL Connected Line number. The number of the connected
party. This may be different from the CPN dialled if the
call has been redirected.
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