Trunking Communications

In a Trunking radio system, radios are always listening to the control channel of the radio’s current Trunking System for channel assignment instructions. Trunking channels can only communicate with radios operating on Trunking channels. Trunking and Conventional channels are assigned to the channels of the radio from the Zone Channel Assignment Window.

Once a regrouping is established, all radios operating on a certain Trunking System are able to communicate simultaneously on the designated Dynamic Regrouping talkgroup.

Trunking key points:

The system logic automatically picks the physical radio frequency channel. A protocol defines the relationship between the radios and the radio backbone which supports them.

Digital trunked systems carry multiple conversations on one physical channel, also called multiplexing.

Instead of channels, radios are related by groups which may be called , talkgroups.

Systems make arrangements for handshaking and connections between radios by:

A computer assigns channels over a dedicated control channel. The control channel sends a continual data stream. All radios in the system monitor the data stream until commanded by the computer to join a conversation on an assigned channel.

If all physical channels are busy, systems include a protocol to queue or stack pending requests until channel is available.

Examples of trunked radio types:

Logic Trunked Radio

EDACS

Trunking Methods:

Trunking methods include:

• Basic Motorola Trunking

• Other Band Trunking (OBT)

• Motorola SmartZone Trunking

• SmartZone OmniLink Trunking

Trunking Coverage Types:

Motorola trunking coverage types include:

• Type II

• ASTRO 25

Trunking Channel Types:

• Announcement Groups

• Talkgroups

• Dynamic Regroupings.