Chapter 15: Glossary - Motorola APX 4000Li User Manual

Glossary
This glossary 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.
ARS
Automatic Registration Service.
ASTRO 25
Vertex Standard for wireless digital trunked
communications.
ASTRO Conventional
Vertex Standard for wireless digital conventional
communications.
Autoscan
A feature that allows the radio to automatically scan the
members of a scan list.
Send Feedback
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.
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