15
English
RADIO OVERVIEW
TRUNKED RADIO SYSTEMS
The EX560•XLS radio can operate in both
LTR™ trunked and conventional radio
systems.
Conventional typically refers to radio-to-radio
communication, sometimes through a
repeater.
A trunked radio system allows a large number
of users to share a relatively small number of
frequencies or repeaters without interfering
with each other.
The airtime of all the repeaters in a trunked
system is pooled, which maximizes the amount
of airtime available to any one radio and
minimizes channel congestion.
Some of the benefits of trunked two-way radio
systems are:
• No channel monitoring required prior to
transmission
• Improved system access
• Automatic channel selection
• Increased privacy among members of the
same group
When an LTR trunked radio user wants to
communicate with another radio, the user’s
radio sends a “channel request” to the home
repeater. The system then sends back a
“channel grant” to the user’s radio. The
channel grant message contains the number of
a “go to” repeater to tell the radio which
repeater to use. This “go to” repeater can be
the same as the radio’s home repeater or
another repeater in the system.
The radio uses the “go to” repeater for
transmission. Once the transmission has
ended, this repeater is available for other
users.
EX560XLS.book Page 15 Thursday, September 27, 2007 3:28 PM
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