Glossary 107
16 Glossary
A
APCO The Association of Public Safety
Communications Officials.
The APCO Project 25 standards
committee (
http://www.apcointl.org/)
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.
control
channel
In a trunk system, the control channel is
used by the trunk site to let the radios 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
trunk system for an extended period of
time. The conventional channel may be
a repeater channel or a direct channel.