Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 382

FEC (Forward Error Correction)
A 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.
Ferrule
A rigid tube that confines or holds a fiber as part of a connector assembly.
Fiber Optic Attenuator
A component installed in a fiber optic transmission system that reduces the power in the optical
signal. It is often used to limit the optical power received by the photo detector to within the
limits of the optical receiver.
Fiber Optic Cable
A cable containing one or more optical fibers.
Fiber Optic Link
A transmitter, receiver, and cable assembly that can transmit information between two points.
Fiber Optic Span
An optical fiber/cable terminated at both ends which may include devices that add, subtract, or
attenuate optical signals.
FIT (Failure In Time)
A unit of failure rate in reliability analysis. One FIT is equivalent to one failure per one billion
operating hours.
FIT Rate
Number of device failures in one billion device hours.
FMM (FlashDisk Memory Module)
A nonvolatile memory device used to store the installation software generic or the NE database.
Fresnel Reflection
A reflection of light that occurs at the air-glass interface at the ends of an optical fiber.
Fused Fiber
A bundle of fibers fused together so they maintain a fixed alignment with respect to each other
in a rigid rod.
Fusion Splicer
An instrument that permanently bonds two fibers together by heating and fusing them.
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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