Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 381

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F Fabric
The part of an optical system that is responsible for switching voice, data or video from one
place to another
Failure
A failure is declared when a fault cause persists for a certain period of time.
Failure Rate
The number of failures of a device per unit of time.
Fall Time
The time required for the trailing edge of a pulse to fall from 90% to 10% of its amplitude; the
time required for a component to produce such a result. Typically measured between the 80%
and 20% points or alternately the 90% and 10% points. Also called turn-off time.
Far-End Crosstalk
Crosstalk which travels along a circuit in the same direction as the signals in the circuit.
FAS (Frame Alignment Signal)
A sequence at the beginning of an SDH/SONET frame that detects the frame start.
FC (Fiber Optic Connector)
A threaded optical connector (originated in Japan), good for single-mode or multimode fiber and
applications requiring low back reflection.
FC/PC
A special curved polish on the connector for very low back reflection.
FCC (Federal Communications Commission)
The U.S. federal regulatory agency responsible for the regulation of interstate and international
communications by radio, television, wire, satellite and cable.
FDDI (Fiber Distributed Data Interface)
A 100 Mbps fiber optic LAN.
FE (Far End)
Any other network element in a maintenance subnetwork other than the one the user is at or
working on. Also called remote.
FEBE (Far End Block Error)
A maintenance signal transmitted in the physical overhead indicating that a bit error has been
detected at the physical layer at the far end of the link.
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365-575-783R1.1
Issue 1, June 2002
Lucent Technologies - Proprietary
See notice on first page
G L O S S A R Y
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