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English
INTRODUCTION
INTRODUCTION
Your CP200XLS™ radio can operate on both
LTR
®
trunked and conventional radio systems.
This radio combines the very latest in two-way
technology while delivering outstanding
functionality at the touch of a button.
CONVENTIONAL RADIO SYSTEMS
Conventional typically refers to radio-to-radio
communications through a single channel.
Conventional systems also allow radio users to
extend communication coverage by relaying
their messages through a repeater. To ensure
coordinated use by multiple users, each radio
user must monitor the channel or repeater
before transmitting to verify that the system is
not currently busy.
TRUNKED RADIO SYSTEMS
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/
talkgroup congestion.
Some of the benefits of trunked two-way radio
systems are:
• No channel/talkgroup monitoring required prior
to transmission
• Improved system access
• Automatic channel/talkgroup selection
• Increased privacy among members of the same
group
LTR Trunked Systems
LTR (Logic Trunked Radio) is a transmission-
based trunking protocol developed by the E. F.
Johnson Company for primarily single-site
trunking applications. In transmission trunking,
a repeater is used for only the duration of a
single transmission. Once a transmission is
completed, that repeater becomes available to
other users. This means that a conversation
comprised of many transmissions may occur
over several different channels/talkgroups
within the LTR system. This method of trunking
provides system efficiency by making
repeaters available to all users after every
transmission.
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