Auto
One possible state of a DS1 port. In this state, the port will automatically be put
″
in service
″
if
a good signal is detected coming from the DSX panel.
Automatic Protection Switch
A feature that allows a protection or standby entity (for example, optical line or circuit pack) to
be automatically selected and reconfigured if an incoming signal or equipment failure occurs.
Autonomous Message
A message transmitted from the controlled Network Element to the ITM-SC which was not a
response to an ITM-SC originated command.
Avalanche Photodiode (APD)
A diode that increases its electrical conductivity by a multiplication effect when hit by light.
APDs are used in lightwave receivers because the APDs have a greater sensitivity to weakened
light signals (for example, those which have traveled long distances over fiber).
....................................................................................................................................................................................................................................
B
B3ZS
Bipolar 3-Zero Substitution
Backbone Ring
A host ring.
Backup
The backup and restoration features provide the capability to recover from loss of NE data
because of such factors as human error, power failure, NE design flaws, and software bugs.
Bandwidth
The difference in Hz between the highest and lowest frequencies in a transmission channel. The
data rate that can be carried by a given communications circuit.
Baud Rate
Transmission rate of data (bits per second) on a network link.
BDFB
Battery Distribution and Fuse Bay
BER
Bit Error Rate
Bidirectional Line
A transmission path consisting of two fibers that handle traffic in both the transmit and receive
directions.
....................................................................................................................................................................................................................................
365-372-333 R2.1
Issue 4, June 2005
Lucent Technologies
G L O S S A R Y
G L - 3