Glossary
Issue 3 June 2000
GL-3
Available Time
In performance monitoring, the 1-second intervals.
B
B3ZS
Bipolar 3-Zero Substitution — A line coding method that replaces a string of three zeros with a
sequence of symbols having some special characteristic.
B8ZS
Bipolar 8-Zero Substitution — A line coding method that replaces a string of eight zeros with a
sequence of symbols having some special characteristic.
Backbone Ring
A host ring
BDFB
Battery Distribution and Fuse Bay
BER
Bit Error Ratio — The ratio of bits received in error to the total bits sent.
BIP
Bit Interleaved Parity — A method of error monitoring over a specified number of bits, that is, BIP-3
or BIP-8.
BITS
Building Integrated Timing Supply — A single clock that provides all the DS1 and DS0 synchroniza-
tion references required by clocks in a building.
BRI
Basic Rate Interface
Broadband
Any communications channel with greater bandwidth than a voice channel; sometimes used
synonymously with wideband.
C
CC
Clear Channel — A provisionable mode for the DS3 output that causes parity violations not to be
monitored or corrected before the DS3 signal is encoded.
CCITT
International Telephone and Telegraph Consultative Committee — An international advisory com-
mittee under United Nations' sponsorship that has composed and recommended for adoption
worldwide standards for international communications. Recently changed to the International Tele-
communications Union Telecommunications Standards Sector (ITU-TSS).
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