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Trunking Operation
Trunked Announcement
The announcement capability allows a user to make announcements
to the entire user group, as well as monitor talkgroup calls and other
announcements.
Announcement calls are handled in two different ways, depending on
the trunked central controller configuration. The two types are called
ruthless and non-ruthless preemption.
• Ruthless Preemption: When a ruthless preemption
announcement call is initiated, the requesting radio begins
transmitting immediately. All associated talkgroup calls taking
place on other channels are immediately halted, and the radios
are steered to the announcement call.
Transmitting radios continue to transmit until the PTT button is
released, at which time they also unmute for the announcement
call. Individual calls (Private Conversation and telephone
interconnect) are not affected.
• Non-Ruthless Preemption: When a non-ruthless preemption
announcement is initiated, the initiating unit receives a telephone-
type busy tone, followed by a call back when all associated
talkgroup conversations end.
Once an announcement call is pending, any attempts by other
users to initiate a talkgroup call will result in a telephone-type busy
tone. These users will not receive a call back until the
announcement call is complete.
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