DISPLAYS, MESSAGES, AND ALERTS: Alert Tones
3-4 68P80400P73-A
3.4 Alert Tones
This unit can send alert tones to the earpiece, speaker, or external speaker. Press 
t
 to determine 
where some of the tones are sent.
As shown in the following table, alert tones have specific frequencies and cadences/durations. They 
are grouped according to function; grouped tones have the same tone specifications.
Table 3-4. Alert Tones
Tone Low High Freq  Cadence When Tone Occurs 
Automatic Callback Ear Spkr 1800Hz 2x (24ms on+24ms off) + 48ms on Voice channel for prior request
Call Alert 
Acknowledgment
 Received
Ear Spkr 1800Hz 2x (80ms off+80ms on) Call Alert successfully sent
Call Alert No Ack 
Received
Ear Spkr 900Hz 1x500ms on Call Alert fails
Call Alert Received Spkr Spkr 2300Hz 4x (150ms off+150ms on) every 10 
seconds
Call Alert received
Call Alert Sent Ear Spkr 1800Hz 2x (80ms off+80ms on) Call Alert acknowledged by 
FNE
Call Waiting
Received
Ear Ear 440Hz 2x(300ms off+300ms on) every 5 
seconds
Phone call received while 
another call is active
Clear to Send Ear Spkr 2300Hz 1x50ms on Reception inhibited; clear to 
transmit
Data Ringer Ear Spkr 2091/
2823Hz
14x (80ms on 2091Hz + 100ms on 
2823Hz + 2.5 seconds off
Unit receives an incoming circuit 
data call
DTMF (0-9, #, *) Ear Ear DTMF Continuous DTMF is transmitted
Earpiece Volume Set Ear Ear 1000Hz Continuous Earpiece volume changed on 
quiet channel or in Programming 
Menu (PRGM)
Group Call Alert Spkr Spkr 2300Hz 2x (150ms off+150ms on) Group call received
In Service Spkr Spkr 2300Hz  1x50ms on Entering in-service mode
Interconnect Busy Ear Ear 480/
620Hz
1s off + 1s on 480Hz; 
1s off +1s on 620Hz continuous
Interconnect channel or line is 
busy
Invalid Key Ear Ear 900Hz  1x80ms on Invalid key pressed
Low Battery in Idle Spkr Spkr 2300Hz 24ms on+24ms off + 24ms on+240 
ms off + 24ms on+24ms off + 24ms 
on+30ms off every 30 seconds
Battery below preset value. 
(Tone sounds from earpiece if in 
low audio during a dispatch or 
interconnect call.)
Keypad Volume Set Ear Ear 1800Hz Continuous Keypad volume changed on 
quiet channel or in Programming 
Menu
Message Mail 
Received in Idle
Spkr Spkr 2400/
2743Hz
8x(64ms on 2400Hz + 64ms on 
2743Hz)every 30 seconds
Message mail received while 
unit is idle
Msg Mail Received 
in Interconnect
Ear Ear 2400/
2743Hz
8x(64ms on 2400Hz + 64ms on 
2743Hz) every 30 seconds
Message mail received while 
unit is in interconnect mode