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Terms and definitions
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Automatic Protection Switch
A feature that allows another synchronization source to be automatically selected and the
synchronization source provisioning to be automatically reconfigured in the event of a
synchronization source failure or network synchronization change, for example, a fiber cut.
Available Time
In performance monitoring, the 1-second intervals.
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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.
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.
Broadband
Any communications channel with greater bandwidth than a voice channel; sometimes used
synonomously with wideband. Also refers to signals at the DS3 (44.736 Mb/s) and higher.
Wideband refers to lower rates (i.e. DS1, VT1.5, etc.).
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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 committee under United Nations' sponsorship that has composed and
recommended for adoption worldwide standards for international communications. Recently
changed to the International Telecommunications Union Telecommunications Standards Sector
(ITU-TSS).
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365-372-603R2.0
Issue 1 January 2009
G L- 1 7
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