Motorola Astro APX User Manual page 131


This glossary is a list of specialized terms used in this manual.

 Acknowledgment of communication.
 A channel that has traffic on it.
An RF signal that has a continuous nature

rather than a pulsed or discrete nature.
 Automatic Registration Service
 Motorola standard for wireless digital

trunked communications.
 Motorola standard for wireless digital
 conventional communications.
A feature that allows the radio to
 automatically scan the members of a scan
list.
 Auxiliary Control Head
Privately page an individual by sending an

audible tone.


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".
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.
A group of characteristics such as transmit/
 receive frequency pairs, radio parameters,
and encryption encoding.
 Control Head Interface Board
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.
Typically refers to radio-to-radio
 communications, sometimes through a
repeater (see Trunking).
 A scan list that includes only conventional
 channels.

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