Selective Switch Any digital P25 traffic having
the correct Network Access
Code and the correct talkgroup.
Squelch Special electronic circuitry,
added to the receiver of a
radio, that reduces, or cuts off,
unwanted signals before they
are heard in the speaker.
Standby An operating condition whereby
the radio’s speaker is muted
but still continues to receive
data.
Status Calls Pre-defined text messages that
allow the user to send a
conditional message without
talking.
Tactical/ Non-
Revert
The user talks on the channel
that was selected before the
radio entered the emergency
state.
Talkaround Bypass a repeater and talk
directly to another unit for easy
local unit-to-unit
communications.
Talkgroup An organization or group of
radio users who communicate
with each other using the same
communication path.
TMS Text Messaging Service
Trunking The automatic sharing of
communications paths between
a large number of users (see
Conventional).
Trunking Priority
Monitor Scan List
A scan list that includes
talkgroups that are all from the
same trunking system.
USK Unique Shadow Key.
UTC Coordinated Universal Time.
The international time standard
(formerly Greenwich Mean
Time, or GMT). Zero hours
UTC is midnight in Greenwich,
England, which is located at 0
degrees longitude. Everything
east of Greenwich (up to 180
degrees) is later in time;
everything west is earlier.
There are 42 time authorities
154
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