APX 4500 O2 CH 
31 
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IDENTIFYING STATUS INDICATORS 
You Hear  Tone Name  Heard 
Short, 
Medium-Pitched 
Tone 
 
 
Play 
Valid Key-Press  When correct key is pressed. 
Radio Self Test Pass  When radio passes its power-up self test. 
Clear Voice  At beginning of a non-coded communication. 
Priority Channel Received  When activity on a priority channel is received. 
Emergency Alarm Entry  When entering the emergency state. 
Central Echo  When central controller has received a request from a radio. 
Long, 
Medium-Pitched 
Tone 
 
 
Play 
 
Volume Set  When volume is changed on a quiet channel. 
Emergency Exit  When exiting the emergency state. 
A Group of 
Medium-Pitched 
Tones 
 
 
Play 
Fail-soft  When the trunking system fails. 
Automatic Call Back  When voice channel is available from previous request. 
Keyfail  When encryption key has been lost. 
Console Acknowledge  When status, emergency alarm, or reprogram request ACK is received. 
Received Individual Call  When Call Alert or Private Call is received. 
Site Trunking  When a SmartZone trunking system fails. 
Call Alert Sent  When Call Alert is received by the target radio.