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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.

Trunked Operation

How a Trunked System Operates