Storage of Ten Fleet Maps
For Type 1 systems, the trunking analyzer
allows for the storage of 10 unique System
ID's and Fleet Maps.
Radios with Message Trunking
The trunking analyzer supports the testing of
message trunked radios.
Radios with Message Trunking and PTT ID
Enabled
The trunking analyzer supports the testing of
message trunked radios with PTT-ID en-
abled.
Transmission Trunked Radios
The trunking analyzer testing of transmission
trunked radios is somewhat limited due to the
nature of the radio. Test sequences can be
performed on transmission trunked radios by
pressing the PTT of the radio and keeping the
radio keyed while switching to other display
screens to make measurements and observe
waveforms. Once the PTT button on the ra-
dio is released, the transmission trunked ra-
dio returns to the control channel and the test
must be re-started in order to rekey the radio.
Dispatch Call
The analyzer supports dispatch call process-
ing where the radio, or the system, initiates
the call sequence. The dispatch type call is
where one radio is communicating through a
repeater with several other radios assigned to
the same group.
Phone Interconnect Call
The trunking analyzer supports the testing of
phone interconnect call service. The trunking
analyzer simulates the signaling required for
the radio to initiate, and to receive a phone
interconnect call. Phone Interconnect service
is where the radio can initiate or receive calls
over the local phone system.
Call Alert
The analyzer supports the testing of call alert
service. The analyzer simulates the signaling
for the radio to initiate, or to receive a call
alert.
Failsoft
The analyzer simulates an inoperative central
controller by not transmitting OSWs on the
control channel, and sending the failsoft
word on the failsoft channel.
5-3 WHAT IS TRUNKING?
Trunking is the automatic sharing of a few
communication paths (trunks) among many users.
Its most important asset is the ability to increase
channel capacity and reduce channel waiting times
compared to the waiting times in conventional
systems. Trunked systems efficiently distribute the
message traffic equally among the available
channels because:
the percentage of times a user requires the
communications link is small
the probability that many users will require
a channel at the same instant is extremely
small
Two-way radio systems use the same techniques
of trunking that are used in telephone applications.
In a trunked radio system, the mobile radios and
fixed equipment operate under the control of a
central controller.
The trunked system usually has a single
centralized site instead of multiple sites or cells.
Trunked systems are usually used for dispatch
operations where one dispatcher is communicating
with many users. The sharing of channels is a
more efficient way to gain spectrum efficiency and
provide better service.
The central controller directs operation of the
trunked radio system and manages the flow of
communications including selection and
assignment of voice channels among the system
users. The central controller ensures privacy and
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