DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112 Issue 5
May 1998
Glossary and Abbreviations

Page GL-23

F
FAC
Feature Access Code
facility
A telecommunications transmission pathway and associated equipment.
facility-associa ted signaling (FAS)
Signaling for which a D-channel carries signaling only for those channels on the same physical
interface.
FASFacility-associated signaling
FATFacility access trunk
FAX
Facs imi le
FCC
Federal Communications Commission
FEAC
Forced Entry of Account Codes
feature
A specifically defined function or service provid ed by the system.
feature button
A labeled button on a telephone or attendant console used to ac cess a specific feature.
FEPFront-end processor
FICFacility interfac e cod es
fiber optics
A technology using materials that transmit ultrawideband electromagnetic light-frequency ranges
for high-capacity carrier systems.
fixed
A trunk allocation term. In the fixed allocation scheme, the time slots necessary to support a
wideband call are contiguous, and the first time slot is constrained to certain starting points.
flexible
A trunk allocation term. In the flexible allocation scheme, the time slots of a wideband call can
occupy noncontiguous positions within a single T1 or E1 facility.
floating
A trunk allocation term. In the floating allocation scheme, the time slots of a wideband call are
contiguous, but the position of the first time slot is not fixed.
FNPA
Foreign Numbering-Plan Area