363-206-208
Glossary
Issue 5 June 2000 GL-3
Automatic Protection Switch
A protection switch that occurs automatically in response to an automatically detected
fault condition.
AUXCTL
Auxiliary Control — The name of the slot to the left of the SYSCTL slot on the
DDM-2000 OC-3 shelf. Currently, the OHCTL fills this slot.
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.
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
synchronization 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. However, wideband FM is not the same as broad-
band.
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