130 Glossary
14 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.
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.
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