Hytera DMR System Planner
56
Application in Direct Mode
The bi-slotted operation is available in Direct mode once you have activated it on
your desired channel.
In Direct mode, Pseudo Trunk is usually applied in three instances:
There are only the subscribers which are using Pseudo Trunk function.
Figure 2.8.1-1：Pseudo Trunk Application in Direct mode 1
Before transmitting, Subscriber A will detect the activities in the channel. If the
channel is free, it will transmit on Slot 1 and will set up the communication here with
the receiver, Subscriber B. If Slot 1 is occupied, Subscriber A will transmit on Slot 2.
Then Subscriber B will receive A’s call and the communication is set up in Slot 2. If A
transmits again when the previous call is over, it will detect Slot 1 first and transmit
and establish the communication here when the slot is available. Once both slots
are occupied, the subscriber will have forcible transmission on Slot 1 according to
TX Admit settings.
When Slot 1 is occupied by the communication between A and B, Subscriber C will
detect Slot 2 after Slot 1, and establish the communication with Subscriber D on Slot
2 if this slot is free. If both slots are occupied, C will determine whether to have
forcible transmission on Slot 1 according to TX Admit settings.
See the details as follows for the situations mentioned above: See the details as
follows for the situations mentioned above:
TX Admit Entire Channel Free Only One Slot Free Entire Channel Occupied
Always allow Tx is allowed. Tx is allowed. Tx on Slot 1.
Channel free Tx is allowed. Tx is allowed. Tx is not allowed.
Color code free Tx is allowed. Tx is allowed. Tx is not allowed.
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