Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 400

TDC (Tunable Dispersion Compensator)
A device which has negative chromatic dispersion where the amount of dispersion can be
adjusted. It is used for compensation of the chromatic dispersion of the transmission fibers.
Thermal Noise
Noise resulting from thermally induced random fluctuation in the receiver load resistance
current.
Throughput Loss
In a fiber optic coupler, the ratio of power at the throughput port to the power at the input port.
TID (Target Identifier)
A provisionable parameter used to identify a NE within a TL1 command.
TL1 (Transaction Language 1)
TL1 is an OS/NE machine-to-machine language. TL1 messages are expressed as ASCII strings.
TL1 messages and syntax are defined by Telcordia requirements.
TrueWave® Fiber
Non–zero dispersion-shifted fiber manufactured by Lucent Technologies.
TSD (Trail Signal Degrade)
The TSD signal (generated by a trail termination sink function) informs the next function(s) of
the "signal degrade" condition of the associated data signal.
TSF (Trail Signal Fail)
The TSF signal (generated by a trail termination sink function) informs the next downstream
function(s) of the "signal fail" condition of the associated data signal (which contains, due to
that "signal fail" condition, the all-ONEs (AIS) pattern).
TT (Trail Termination)
An atomic function within a layer that generates, adds, and monitors information concerning the
integrity and supervision of adapted information.
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U UART (Universal Asynchronous Receiver and Transmitter)
A receiver/transmitter that converts incoming serial data from a port into parallel form.
UFEC (Ultra Forward Error Correction)
An improved method to correct bit errors in a transmission signal. Additional information is put
into the data signal to allow the correction of bit errors. There is no acknowledge information in
the back direction.
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G L O S S A R Y
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Lucent Technologies - Proprietary
See notice on first page
365-575-783R1.1
Issue 1, June 2002