120 Glossary
13 Glossary
A
APCO
The Association of Public Safety
Communications Officials.
The APCO Project 25 standards committee
(
) defined a digital
radio standard. The standard is often referred
to as ‘APCO’ or ‘P25’.
C
channel
In a conventional system, a channel is a pair of
frequencies used to transmit and receive radio
signals.
In a P25 trunking system, a channel is a
group of radio users.
control
channel
In a P25 trunking system, the control
channel is used by the trunking site to let the
radio units in the site’s coverage area know
when they can transmit their call
information.
conventional
operation
In conventional operation, the radio is tuned
to a programmed channel, and
communicates with other radios either on
that channel, or through a repeater system.
F
failsoft
Failsoft operation offers P25 conventional
operation if the radio cannot acquire a
control channel on a trunking system for an
extended period of time. The conventional
channel may be a repeater channel or a
direct channel.
Summary of Contents for TM9456
Page 1: ...TM9456 Dual Radio User s Guide MAU 03301 01 01 Issue 1 July 2016 ...
Page 2: ......
Page 55: ...Hearing faint and noisy signals 55 ...
Page 61: ...Dual radio operation 61 ...
Page 128: ...128 zones about 34 selecting 34 ...
