E F Johnson Company 2425M80 Benutzerhandbuch

Draft 02 - Sep 1 2015

5-9

If silent programmed, none of these indications occur. If “No Receive Activity During 
Emergency” is programmed, receive audio, the front panel LED, and receive icons are 
disabled in the receive mode.

3 When the emergency alarm is acknowledged by the dispatcher, “ACK RECVD” is 

briefly displayed on the Standard Control Head, “ACK Received” on the Lightning 
Control Head, and the emergency acknowledge tone (two beeps) sounds. This alert 
tone can be disabled if desired, and neither occur if Silent operation is programmed.

Retries will automatically occur for conventional analog until the retry counter 
completes.

4 The emergency alarm mode is exited when radio power is cycled or by pressing and 

holding the Emergency option switch.

This feature notifies a user when an emergency call is being made on their selected P25 
Conventional or P25 Trunking Talkgroup. The radio should also be programmed with an 
“Emergency Clear” button.

If an emergency call is received by the radio on the selected channel, the emergency alarm 
ACK tone will sound (five consecutive tones), and the Emergency Received message will 
display, followed by the unit ID of the emergency radio. If any other emergency calls are 
made after this initial one using a different radio, the tone will not sound, but the unit ID 
will be updated to reflect the most recent emergency call. To exit out of this state, press the 
“Emergency Clear” button. The radio should return to its normal display, and the 
Emergency Received message should no longer show.

The Emergency Call feature allows a user to place an emergency voice call by pressing the 
PTT switch after pressing the Emergency option button. If the Emergency Hot Mic feature 
is enabled, the emergency call is automatically transmitted without having to press the 
PTT switch (see following description). The system to which the emergency channel is 
linked must have Emergency Calls enabled. Analog and Digital (P25) calls can be 
individually enabled.

If the emergency call is sent on a P25 channel, an emergency indication is sent according 
to the P25 standard (the emergency bit is set in the Common Air Interface). If it is sent on 
an analog channel, the DTMF Emergency ID is sent in place of the ANI DTMF PTT ID if 
applicable.