APX 4500 O2 CH
18
Alert Tones
IDENTIFYING STATUS INDICATORS
An alert tone is a sound or group of sounds. Your radio uses alert tones to inform you of your radio’s conditions.
The following table lists these tones and when they occur.
You Hear
Tone Name
Heard
Short,
Low-Pitched
Tone
Play
Radio Self Test Fail
When radio fails its power-up self test.
Reject
When unauthorized request is made.
Time-Out Timer Warning
Four seconds before time out.
No ACK Received
When radio fails to receive an acknowledgment.
Individual Call Warning Tone
When radio is in an individual call for greater than 6 seconds without any activity.
Talk Prohibit/
PTT
Inhibit
(When
PTT
button is pressed) transmissions are not allowed.
Long,
Low-Pitched
Tone
Play
Time-Out Timer
Timed Out
After time out.
Out of Range
(When
PTT
button is pressed) the radio is out of range of the system.
Invalid Mode
When radio is on an unpreprogrammed channel.
A Group of
Low-Pitched
Tones
Play
Busy
When system is busy.