Instruction manual

GLOSSARY
F
Facility
A general term used for the telecommunications transmission pathway and associated
equipment.
Facility Restriction Level (FRL)
The FRL is used to determine the accessibility of user trunk groups in a routing pattern.
When searching for a routing pattern, the originator's FRL must be greater than or equal
to the FRL for the accessed trunk group.
FAS/NFAS
Facility Associated Signaling (FAS) describes the type of signaling in which an ISDN DS1
interface D-Channel carries signaling information for only those B-Channels located on
the same DS1 facility as the D-Channel. Non-Facility Associated Signaling describes the
type of signaiing in which an ISDN DS1 interface D-Channel carries signaling information
on one DS1 facility for B-Channels located on another DS1 facility.
Feature
A specificity defined function or service provided by the system.
Feature Button
A labeled button on a voice terminal or attendant console designating a specific feature.
Foreign Exchange (FX)
A central office other than the one providing local access to the public telephone network.
Foreign Exchange Trunk
A telecommunications channel that directly connects the system to a central office other
than its local central office.
Foreign Numbering Plan Area Code
An area code other than the local area code. The foreign area code must be dialed to
call outside the local geographical area.
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