Motorola ASTRO APX MOBILE O2 CONTROL HEAD, User Manual

Page: 133 / 142

Glossary
English
115
Glossary
This glossary is a list of specialized terms used in this manual.
Term Definition
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.
ARS Automatic Registration Service
ASTRO 25
Trunking Motorola standard for wireless digital
trunked communications.
ASTRO
Conventional Motorola standard for wireless digital
conventional communications.
Autoscan
A feature that allows the radio to
automatically scan the members of a scan
list.
AUX CH Auxiliary Control Head
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.
CHIB Control Head Interface Board
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).
Conventional
Scan List A scan list that includes only conventional
channels.
Term Definition