Restricting the Continuous Transmission Duration (Time-out Timer)
Time-out Timer (TOT)
is the function to restrict the duration for the transceiver to continuously transmit.
This function is used to prevent a user from occupying a repeater or frequency which is shared with other users. The
transceiver automatically stops transmitting and releases the channel if it continuously transmits longer than the configured
time.
Time-out Timer can be configured for each system. Also, timers, such as TOT Pre-alert, TOT Rekey Time, and TOT Reset
Time, relevant to Time-out Timer can be configured.
TOT Pre-alert
TOT Pre-alert is
the function to notify a user that a continuous transmission is about to end by the Time-out Timer. A TOT
Pre-alert Tone (3 beeps) sounds from the transceiver before the transceiver stops the continuous transmission by the Time-
out Timer.
Example: Time-out Timer: 30 sec, TOT Pre-alert: 4 sec
PTT
Press
Release
TOT
Time 0 sec 26 sec 30 sec
Count Start
Expire TOT
Alert Start
TOT Pre alert
Transmit
Transmit End
TOT
Pre-alert
Tone
Alert End
Figure 1-2 TOT Pre-alert
Note
If “Off” is configured for TOT Pre-alert, no TOT Pre-alert tone sounds from the transceiver.
TOT Rekey Time
TOT Rekey Time is the amount of time from when the transceiver stops the transmission by the Time-out Timer until
transmission becomes possible again.
Example: Time-out Timer: 30 sec, TOT Rekey Time: 20 sec
30 sec
PTT Press Press
Release
No Transmit
TOT
0 sec
Time
50 sec
Time
TOT Rekey
Expire
Count Start
Expire TOT
Count Start Count Start
Transceiver Transmit Transmit
Receive
TOT Rekey Time
Figure 1-3 TOT Rekey Time
Note
0
If “Off” is configured for TOT Rekey Time, the transceiver will immediately be ready to transmit.
0
The timer will be reset if the zone or channel is changed while the TOT Rekey Time is counting down.
1 DMR CONVENTIONAL SYSTEM
1.1 Initiating Voice Communications (Basic Transmission and Reception)
DMR FUNC (K, F)/Ver 2.20 5
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