E F Johnson Company 2425M70 Benutzerhandbuch

6-8

Emergency Alarms and Calls are separate functions that can be individually enabled or 
disabled on each analog and P25 conventional system. The Emergency option switch (or 
menu selection) is required for these functions. Emergency Alarms and Calls are 
transmitted on the global (radio wide) emergency zone/channel if one is programmed and 
a smart console with message receiving capabilities is used. If it is not programmed, the 
emergency is transmitted on the selected channel. The emergency programming of the 
system to which that channel is linked controls the emergency operation.

An emergency alarm is a special transmission that alerts a dispatcher of an emergency 
situation. It is sent automatically by pressing Emergency option switch. The system to 
which the emergency channel is linked must have Emergency Alarms enabled. If it does 
not, Emergency Alarms are disabled. Emergency alarms and calls can be received on 
smart consoles with message receiving capabilities.

In the P25 conventional mode, a special P25 emergency data transmission is sent, and in 
the conventional analog mode, an DTMF emergency ID is sent. Refer to Section 6.12.3 for 
information on the MDC1200 Emergency Alert.

Proceed as follows to send an emergency alarm:

1 If required, select a channel of a system on which Emergency Alarms are enabled and 

then press the EMER option switch. The radio then automatically transmits the 
emergency alarm.

2 Either Normal or Silent operation can be programmed. With the Normal mode, the red 

LED lights, the emergency tone sounds, and “EMERGNCY” flashes in the display. 
This indication continues to flash until the alarm mode is ended (see Step 4).

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 RCVD” is 

briefly displayed 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.