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Glossary
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ASCII - American Standard Code for Information Interchange
A standard 8-bit code used for exchanging information among data processing systems and
associated equipment.
Auto
One possible state of a service interface port. In this state, the port will automatically be put "in
service" if a good incoming signal is detected on the port.
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/E3 (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/E3 output that causes parity violations not to be monitored or
corrected before the DS3/E3 signal is encoded.
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GL - 1 6
Terms and Definitions
365-372-403R5.1
Issue 1 November 2008
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