Instruction manual

GLOSSARY
Equalization
The DS1 signal is shaped so that when it reaches the cable-end it conforms to the
DSX-1 interface power specification.
Erlang
A traffic measuring unit that expresses the load of one or more traffic-handling
devices [36 CCS equals 1 erlang - see CCS (Hundred Call Seconds)].
Extension Number
One- through four-digit number assigned to each voice terminal and data end point in
the system.
Also see “Personal Dial Code”
Extended Station
A single-line voice terminal located more than 2000 feet from the system cabinets.
External Call
A connection between a system user and a party on the public telephone network or
on a tie trunk; usually referred to as an outside or trunk call.
FRL: (Facility Restriction Level)
Facility (physical)
A transmission channel to another switching system; to a Central Office for example.
By application, examples are:
● CO Trunks
● FX Trunks
● WATS Trunks
● Tie Trunks
By technical type these include loop start, ground start, DID, automatic ringdown, etc.
These facilities may be accessed by their facility access codes (FACs).
Feature
A specifically defined function or service provided by the system.
Feature Button
A labeled button on a voice terminal or attendant console designating a specific
feature.
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