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8 NXDN CONVENTIONAL SYSTEM
8.1 Initiating Voice Communications (Basic Transmission and Reception)
The transceiver considers a retransmission within this configured length of time as a continuous transmission. In the
following example, the counting of Time-out Timer continues because the transmission was started by a user pressing the
PTT switch while the TOT Reset Time was counting down.
Example 2: Time-out Timer: 30 s, TOT Reset Time: 10 s
Note
• If "Off" is configured for TOT Reset Time, the Time-out Timer will be reset immediately after the transceiver finishes transmitting.
• The timer will be reset if the zone or channel is changed while the TOT Reset Time is counting down.
Configuration using KPG-169D/ KPG-170D/ KPG-175D
•
Configuring the Time-out Timer (
•
Configuring the TOT Pre-alert (
•
Configuring the TOT Rekey Time (
•
Configuring the TOT Reset Time (
Avoiding Interference with Other Communications (Busy Channel Lockout (NXDN))
Busy Channel Lockout is the function to automatically restrict the transmission so as not to interfere with other
communications.
If an attempt is made to transmit on a channel that is already being used by other groups, the transceiver automatically
restricts the transmission.
A Warning Tone A sounds from the transceiver and the transceiver cannot transmit if the PTT switch is pressed when Busy
Channel Lockout is enabled. The Warning Tone A sounds from the transceiver until the PTT switch is released.
Also, a Warning Tone B sounds from the transceiver and the transceiver cannot transmit if the transceiver attempts to
transmit by using the VOX function when Busy Channel Lockout is enabled.
Following are conditions to disable transmission by Busy Channel Lockout (NXDN).
Configuration
Busy Channel Lockout is disabled. Transmission is not restricted even if the channel on which the
No
transceiver attempts to transmit is busy.
Carrier Only
The transceiver cannot transmit while the transceiver is receiving a carrier.
The transceiver cannot transmit if the transceiver receives a carrier and the received RAN code does not
Incorrect RAN
match the RAN code preconfigured for the transceiver.
The transceiver cannot transmit if the transceiver receives a carrier and the received RAN code matches the
Correct RAN
RAN code preconfigured for the transceiver.
Any RAN
The transceiver cannot transmit while receiving a RAN code.
Note
• Busy Channel Lockout cannot be activated in Emergency Mode. Also, Busy Channel Lockout cannot be activated while the Monitor
function is enabled by a user pressing the Monitor key.
• GPS data is not sent automatically while Busy Channel Lockout is enabled.
FUNC (K)/Ver 1.20
PTT
Press
Release
Press
TOT
Count Start
TOT Reset Time
TOT Reset Time
Count Start
Time
0 s
10 s
20 s
Figure 8-5 TOT Reset Time 2
Edit > Optional Features > Common 1)
See
See
Edit > Optional Features > Common 1)
See
Edit > Optional Features > Common 1)
See
Edit > Optional Features > Common 1)
Table 8-2 Busy Channel Lockout (NXDN)
Expire TOT
Expire
30 s
Description
CONTENTS
INDEX
52
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