Glossary
GL-8 Issue 3 June 2000
EST
Environmental Stress Testing
F
FCC
Federal Communications Commission
FDDI
Fiber Distribution Data Interface
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.
FE-ACTY
Far End Activity — An LED on the user panel.
FEBE
Far End Block Error — An indication returned to near-end transmitting node that an errored block
has been detected at the far end.
FE ID
Far End Identification — The 7-segment display on the faceplate of the SYSCTL circuit pack.
FEPROM
Flash EPROM — A new technology that combines the non-volatility of EPROM with the in-circuit
reprogrammability of EEPROM (electrically-erasable PROM.)
FERF
Far-End Receive Failure — An indication returned to a transmitting terminal that the receiving termi-
nal has detected an incoming section failure.
FE SEL
Far End Select — An LED on the user panel.
FIT
Failures in /10
9
hours of operation.
Free Running
An operating condition of a clock in which its local oscillator is not locked to an internal synchroniza-
tion reference and is using no storage techniques to sustain its accuracy.
FT-2000
Lucent’s SONET OC-48 Lightwave System
Function Unit
Refers to any one of a number of different circuit packs that can reside in the A, B, or C function unit
slots on the DDM-2000 OC-3 Multiplexer, or in the A, B, C, or D function unit slots of the DDM-2000
OC-12 Multiplexer.
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