NOTICE:
If the radio is in a private or group call, the radio waits until the call ends and then
enters the Silent Emergency Mode.
The radio keeps re-sending the alarm until successful sending is confirmed. After the alarm is
successfully delivered, the radio stays in Silent Emergency Mode and waits for the Ambience
Listening.
Your radio exits the Silent Emergency Mode, under the following conditions:
• Press
Menu
and then
#
key within 3 seconds.
• No success in sending the Silent Emergency Alarm and the maximum number of retries has been
reached.
• The control room terminates the Silent Ambience Listening.
• The Ambience Listening is disconnected due to another reason.
If you turn off the radio in the Silent Emergency Mode, the radio switches to pseudo power off state. In
this state, the radio appears to be turned off. However, the radio is still on and in the Silent Emergency
Mode. On turning the radio on during the pseudo power off state, the radio acts as during turning on
and still is in the Silent Emergency Mode.
3.5.9
Invisible Emergency
It is possible for the service provider to disable visual and audible indications when performing
Emergency Operation on the radio, known as Invisible Emergency. Invisible Emergency provides an
extra layer of safety when using Emergency Operation in a critical situation, for example during a direct
attack on the user.
3.5.10
Emergency Alert
This feature allows the radio to send emergency alerts to other radios within its Direct Mode Operation
(DMO) coverage by pressing the
Emergency
button. This feature is a selling feature.
Even in Trunked Mode Operation (TMO), the radio monitors a special DMO emergency frequency for
possible emergency alerts and responds to them by automatically joining the emergency call.
To initiate the emergency alert, the radio must be in MS-MS DMO mode or out of coverage in TMO
mode. The alert is not sent to the dispatch console.
To receive the emergency alert, the radio must be in DMO or TMO, within RF range of the initiating
radio, and must not be in a call. When the radio receives the emergency alert, it joins the call
automatically.
The following table illustrates the dependencies between the current radio mode and the type of
emergency operation:
Table 15: Emergency Operation Dependencies
Radio Mode
Initiate Emergency
Emergency Alert Received
(Yes/No)
DMO, MS-MS, idle
Emergency Alert
Yes
DMO, Repeater, idle
Standard DMO Emergency
Yes
DMO, Gateway, idle
Standard DMO Emergency
Yes
DMO, in call
Per communication mode
No
TMO, no coverage
Emergency Alert
Yes
MN002041A01-AH
Chapter 3: Modes
68
