User's Manual

ASTRO Digital XTS 2500 Model III 97
Glossary
This is a list of specialized terms used in this manual.
ACK Acknowledgment of communication.
Active Channel A channel that has traffic on it.
Analog Signal An RF signal that has a continuous nature
rather than a pulsed or discrete nature.
Call Alert Privately page an individual by sending an
audible tone.
Carrier Squelch Feature that responds to the presence of an
RF carrier by opening or unmuting (turning
on) a receiver's audio circuit. A squelch
circuit silences the radio when no signal is
being received so that the user does not
have to listen to “noise.”
Central Controller A software controlled, computer-driven
device that receives and generates data for
the trunked radios assigned to it. It monitors
and directs the operations of the trunked
repeaters.
Channel A group of characteristics such as transmit/
receive frequency pairs, radio parameters,
and encryption encoding.
Control Channel In a trunking system, one of the channels
that is used to provide a continuous, two-
way/data communications path between the
central controller and all radios on the
system.
Conventional Typically refers to radio-to-radio
communications, sometimes through a
repeater. (See Trunking.)
Cursor A visual tracking marker (a blinking line) that
indicates a location on the display.