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PBX Integration Board User’s Guide
Hybrid System
A term used to describe a telephone system that has
attributes of both Key Systems and PBXs. Usually means that
incoming lines (trunks) appear on the phone set, and outbound calls
require the use of an access code (typically a “9”).
KSU Key Service Unit - The main cabinet that contains all the electronics
to run a Key Telephone System.
KTS Key Telephone System - A telephone system in which the station
sets have multiple keys permitting the user to select outgoing or
incoming CO phone lines. You do not have to dial an access code
(typically “9”) to access CO lines.
LCD Liquid Crystal Display - An alphanumeric display using liquid
crystals sealed between two pieces of glass. Usually a gray background
with black characters.
LED Light Emitting Diode - A diode that emits light. Can be used as a
single indicator or combined with other LEDs to create an
alphanumeric display.
Line Card A plug-in electronic printed circuit board for a PBX or KSU
that operates lamps, ringing, holding, and other features associated
with several telephone lines.
Off-hook When the handset is lifted from its cradle. Alerts the CO (or
PBX) that it is ready (usually ready to receive a dial tone).
On-hook When the handset is resting in its cradle. The phone is not
connected to any line.
On-hook Dialing A feature that allows the caller to dial without lifting the
handset. After dialing, the caller can listen to the progress of the call
through the built-in speaker.
PBX Private Branch Exchange - A private phone system allowing
communications within a business and between the business and the
outside world. Outside lines are not accessible to the station set. An
access code (typically “9”) is required to connect to an outside line.
Speakerphone A telephone that has a speaker and a microphone for
hands-free conversation
Station Set A telephone used with a PBX or KTS.
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