Lucent Technologies Metropolis DMXplore, Руководство по установке

Страница: 314 / 330

...........................................................................................................................................................................................................................................................
G L O S S A R Y
G L - 1 8
365-372-334 R2.0
Issue 4, November 2004
......................................................................................................................................................................................................
......................................................................................................................................................................................................
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.
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.).
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.