Hytera DMR System Planner
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z When TX Admit is set to “Allow”, the subscriber will transmit on Slot 1.
z When TX Admit is set to “Color Code Free” or “Channel Free”, and Slot 1 is
busy, the transmission will be refused.
Set to “Slot 2”: The subscriber will transmit on Slot 2 in Pseudo Trunk mode, except
for the response.
If no carrier or analog interference is detected, the subscriber will transmit on Slot 2,
the default slot, after the repeater is activated; when receiving a call, the subscriber
will respond on the slot where the call is received; once Slot 2 or both slots are
occupied, the subscriber will determine whether to transmit on Slot 2 according to
TX Admit.
z When TX Admit is set to “Allow”, the subscriber will transmit on Slot 2.
z When TX Admit is set to “Color Code Free” or “Channel Free”, and Slot 2 is
busy, the transmission will be refused.
2.8.2 Priority Interrupt
Priority Interrupt allows a subscriber to make the channel free for its own voice or
data service by interrupting an ongoing call on the channel or terminating the
services of a repeater such as Call Hold and Remote Monitor.
Priority Interrupt is especially useful when the channel is busy. With this feature, the
user can interrupt the active call to transmit his voice signals or data on the channel.
This feature is also used for channel management to optimize channel efficiency.
Priority Interrupt allows a subscriber to make the channel free for its own voice or
data services by interrupting an ongoing call on the channel or terminating the
services of a repeater such as Call Hold and Remote Monitor. This feature can only
interrupt the voice services but not data. Thus, the ongoing data services such as
GPS or short message on the channel will not be affected.
In Pseudo Trunk mode, the channel has two time slots, which can be used to
receive data and voice services separately at the same time. When one slot is
occupied, the subscriber can transmit the Priority Interrupt command in the other
slot, and the active call on the channel will be interrupted when the target subscriber
responds to the command.
Before transmitting the Priority Interrupt command, the subscriber will detect the
channel status. If Slot 1 is busy with a call and Slot 2 is free, the command will be
transmitted in Slot 2. Then, after the target subscriber receives and decodes the
command in Slot 2, the ongoing call in Slot 1 will be interrupted, so the interrupting
subscriber can transmit its own services in Slot 1. The subscriber which enables
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