
116 / Glossary
Modules (TM) that supports more external lines, or Station Modules (SM) that support more Norstar telephones.
incoming line group (ILG): A group of lines used for incoming calls. Incoming line groups provide telephone access to several incoming lines without taking up many line buttons. A line is assigned to be part of an incoming line group in Installer programming.
Installer password: A
Integrated Services Digital Network (ISDN): A digital
telephone service that allows for a combination voice and data connection over a single, high- speed connection. ISDN service can operate over the same copper
Intercom button: A button that provides access to internal lines used for calls within a Norstar system and access to external lines through a line pool or external code. A telephone may be assigned zero to eight Intercom buttons. This is done during an Installer programming session.
Intercom keys: See Intercom
button.
K
Key Service Unit (KSU): Please
see Integrated Communication System (ICS).
L
Line Pool:
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A group of lines used for making external calls. Line pools provide an efficient way of giving a telephone access to external lines without taking up many line buttons. A line is assigned to be part of a line pool in an Installer programming session.
M
M7310 telephone: A telephone that has a
M7324 telephone: A telephone with a
Module: A component of the Norstar key system. Includes the
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