13 Glossary - Tait TM9456 User Manual

13 Glossary

A
APCO
C
channel
control
channel
conventional
operation
F
failsoft
120 Glossary
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'.
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.
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.
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.
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.