Hytera PD70X Series, System Planner Manual

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Hytera DMR System Planner
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5.3.4 Priority Interrupt
Pseudo Trunk is a bi-slotted work mode allowing the subscriber to work in two slots,
while Priority Interrupt is a function only working in Pseudo Trunk mode. The
interrupting subscriber can only use one slot to transmit the voice signals, leading to
the misunderstanding that Pseudo Trunk cannot support bi-slotted work mode with
Priority Interrupt. Actually Pseudo Trunk still works in bi-slotted mode, and Priority
Interrupt just embodies it: In the process of the interruption operation, one slot is
being used for a call, so the other must be free for the command transmission. Once
both slots are occupied, the command may fail, so you will need corresponding
configuration before the operation.
The Priority Interrupt command may fail to interrupt the ongoing call on the channel
by three main causes:
Cause 1: The subscribers are not configured correctly or completely. The function
requires the respective configuration on the interrupting and the interrupted
subscribers, and different interruptions need different configuration, otherwise, the
interruption will fail.
Cause 2: The channel is occupied. The subscriber configured with Priority Interrupt
feature can only use one channel to transmit voice services. However, in actual use
in the system, there may be some subscribers not configured with this feature or
even Pseudo Trunk, so there may be two channels occupied. In this case, the
Priority Interrupt commands can be transmitted but may not work.
Cause 3: The activity on the channel is a data service, which is not allowed to be
interrupted.
Apart from the above causes, there is little failure caused by system error. Thus, if
your encounter other causes except these three, please transmit the command
again.
Interaction between Priority Interrupt and Other Features
1. Interaction with Pseudo Trunk Designated Tx: Once Pseudo Trunk Tx slot is
designated, the voice signals or data services must be transmitted in the
designated slot after the Priority Interrupt command transmission, whether the
interrupt succeeds or not.
2. Interaction with Call Back: Whether the Pseudo Trunk Tx slot is designated, the
Call Back after the interruption will be made in the call-receiving slot.