Appendix A: Tones
Table A-1
Radio Tones
Tone Name
Tone Diagram
Back to Coverage
Back to Full Service
0
100
200
300
400
2
400
2100
1800
1000
900
600
400
200
[Hz]
[ms]
Clear-to-send
0
100
200
300
400
2
400
2100
1800
1000
900
600
400
200
[Hz]
[ms]
Bad Key Pressed
0
100
200
300
400
2
400
2100
1800
1000
900
600
400
200
[Hz]
[ms]
From Out-of-Service to In
Service
0
100
200
300
400
2
400
2100
1800
1000
900
600
400
200
[Hz]
[ms]
In DMO
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
In Emergency
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
Call Clear Warning
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
Talk Permit
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
Talk Permit without
Gateway
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
• Talk prohibit
• System busy
• Time-out timer expire
• Called radio not
available or busy
0
100
200
300
400[ms]
2400
2100
1800
1000
900
600
400
200
[Hz]
-
A-1