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Using the Optional Signaling (P25)
Optional Signaling is the signaling used to initiate a selective call. The Optional Signaling available for a P25 Conventional
system is 2-tone. (Refer to
Using 2-tone to Initiate an Individual Call
2-tone signaling uses a pair of 2 different tone frequencies in series for an individual call. The transceiver emits a ringing
tone (Alert Tone) and starts the Transpond if the received NAC matches the NAC preconfigured for the transceiver and the
received 2-tone code matches the 2-tone code preconfigured for the transceiver.
The transceiver behaves as follows according to the type of a received signal on a channel with “Mixed” configured in
Channel Type
.
0
If the transceiver receives analog signals
The transceiver behaves according to the configuration in
Optional Signaling (Analog)
.
0
If the transceiver receives digital signals
The transceiver behaves according to the configuration in
Optional Signaling (P25)
.
To decode a 2-tone code in a P25 Conventional system, “2-tone 1”, “2-tone 2”, “2-tone 3”, or “2-tone 4” needs to be configured
in
Optional Signaling (P25)
for the channel.
Configuration using KPG-D1/ D1N
0
Configuring
Optional Signaling (P25)
(Personality) (
Transceiver Settings > Personal > Personality > P25
Conventional (P25 Voting with NAC) > P25 > Optional Signaling)
0
Configuring
Optional Signaling (P25)
(Channel Edit) (
Transceiver Settings > Zone/Channel > Channel Edit >
P25 Conventional (P25 Voting with NAC) > P25 > Optional Signaling)
Unmuting the Speaker (Audio Control (P25))
Audio Control
is the condition which allows the transceiver to unmute the speaker by a NAC and Optional Signaling. The
conditions on which the transceiver unmutes the speaker can be configured for each channel by using KPG-D1/ D1N.
The transceiver unmutes the speaker and emits the received audio when the conditions configured in
Audio Control
are
satisfied.
Conditions to unmute the speaker can be changed by a combination of the NAC and the Optional Signaling.
The following are the conditions to unmute the speaker:
Table 1-4 Audio Control (P25)
Configuration
Description
NAC
The transceiver unmutes the speaker if the received NAC matches the NAC preconfigured for the
transceiver. Conditions remain unchanged even if the transceiver transmits.
NAC and Optional
Signaling
The transceiver unmutes the speaker if the received NAC matches the NAC preconfigured for the
transceiver and the received Optional Signaling matches the Optional Signaling preconfigured for
the transceiver. Conditions remain unchanged even if the transceiver transmits.
1 P25 CONVENTIONAL SYSTEM
1.2 Using the Signaling
P25 FUNC (K)/Ver 2.20
12