Hytera DMR System Planner
10
Tx Admit: This is used to prevents you from transmitting on channels that are
already in use.
Always Allow: The radio can transmit via the PTT key any time regardless of the
channel.
Channel Free: The radio is allowed to transmit when the channel is free.
Code Color Free: The radio can transmit only when the channel is free or the
color code is not matched.
Group Call Hang Time: The time in which the radio still hangs in the group call after
the call is over. In other words, a member's PTT operation can call back the group
directly without contact list selection.
Private Call Hang Time: The time in which the radio still hangs in the private call
after the call is over. Within this period, either of the communication parties can call
back the other directly by holding the PTT key without contact list selection or
Acknowledge.
Time Slot: DMR applies TDMA scheme to divide the 12.5kHz channel into two
consecutive slots. Either slot can be used for communication or data transmission.
Slot 1: Slot 1 is used for transmitting and receiving in Repeater mode, as well as
receiving signals from repeater in Direct mode.
Slot 2: Slot 2 is used for transmitting and receiving in Repeater mode, as well as
receiving signals from repeater in Direct mode.
Pseudo Trunk: Both slots can be used simultaneously for communication or
data transfer in Direct and Repeater modes. And in Repeater mode, the slot is
alternative.
Note: Pseudo Trunk is one of the Hytera patents. Generally, in Repeater mode,
DMR standard protocol defines radios to transmit in the fixed slot. If the slot is
occupied, the radio has to wait for it instead of another free slot, wasting the
frequency band resources. However, the Pseudo Trunk feature allows two different
calls to be made simultaneously in Direct mode, as well as the dynamic slot
distribution in Repeater mode. This brings great convenience and efficiency to the
communications.
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