User`s guide

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Site De-registration The automatic site “sign-off” by the radio when the user roams to
another site or selects a talkgroup on a different system. This
notification alerts the system control equipment that the channels at
the site will not be used by that radio until it returns to that site.
SMARTNET™ A type of Trunking system primarily used in support of public safety
and industrial communication systems. This type of system has
emergency and dynamic regrouping capabilities.
SmartZone™ A wide area coverage system that supports SMARTNET II trunking
features including group calls, selective calls and telephone calls as
well as unique SMARTNET features such as Emergency Alarm/Call,
Dynamic Regrouping, Selective Radio Inhibit and Console Dispatch.
Snapshot A feature which allows the dispatcher to check the operating mode of
any radio in a Trunked system. This feature is used to obtain up-to-the-
second reports on a radio’s operating status, talkgroup affiliation,
announcement group affiliation, and last registered site of operation.
Softpot Software potentiometer. A computer-adjustable electronic attenuator.
Squelch A radio circuit that eliminates noise from the loudspeaker when a
transmit or receive signal is not present.
Standby Mode An operating mode in which the radio is muted but still continues to
receive and monitor data.
STAR™ A tone signalling system developed and trademarked by General
Electric.
Status/Message A predefined and stored message or radio status indication sent to the
dispatcher without the user having to talk.
Sub-directories A list of computer directories that are located under a unique directory
label.
System Central Controller Also referred to as Central Controller. Main control unit of the
Trunked dispatch system. A software-controlled, computer-driven
device that receives and generates data for the Trunked radios assigned
to it. The Central Controller is responsible for monitoring and
directing the operations of the Trunked repeaters.
System ID A number assigned to a Trunked system distinguishing it from other
systems. The system ID is sent out every three seconds on the Control
Channel.
TOT See “Time-Out Timer”.
TPL Tone Private-Line Squelch. Private-Line Squelch that uses sub-audible
tones to unmute the receiver. Also known as Channel Guard, Quiet
Call or CTCSS.
Talkaround Frequency A frequency used for simplex conversions or radio-to-radio
communications without the use of a repeater.
Talkback A radio feature that allows the user to return a call simply by pressing
PTT and articulating a response.