Motorola MTX-810 User Manual - Page 23
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How a Trunked System Operates
A trunked system uses repeater channels to create a communications path. Each
system contains up to 20 repeater channels, depending on system requirements.
The trunking controller, the main control unit of the system, uses one of the
channels as a dedicated control channel. This channel is the link between the
trunking controller and radios in the system. The trunking controller continuously
transmits information to all radios. This information consists of timing signals to
keep radios synchronized to the trunking controller and identification signals to
identify the control channel. All radios automatically monitor the control channel
when there is no voice traffic and are silent until summoned by the trunking
controller.
A typical system might consist of a certain number of radio units operating within
an organized group, known as a fleet. Each fleet can be segmented into
independent subfleets. Subfleet segmentation allows the fleet to be organized into
predetermined groups according to function. Members of a subfleet hear only
those messages intended for the subfleet.
When a user presses the PTT to begin communication, the following events
occur, all in less than one second:
A voice channel request is automatically sent to the trunking controller via the
control channel.
The trunking controller decodes this request, identifies the user, and
determines which subfleet is being called.
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Trunked Operation
How a Trunked System Operates