2-18 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
5.1.2 Emergency Alarm
If the terminal is provisioned with the emergency alarm feature, upon entry into emergency mode,
the terminal will send an emergency alarm. This alarm is sent by sending a specially designated
SDS status message to the address of the selected group. In addition, once the terminal is in
emergency mode (and the terminal is provisioned with the emergency alarm feature), whenever the
user presses the designated emergency button, an additional emergency alarm will be sent. The
message can be dispatched both in TMO and DMO.
5.1.3 Emergency Group Call
The user is able to initiate an emergency group call in emergency mode and can participate in an
emergency group call (initiated by others) in emergency mode or in regular group mode.
If a terminal receives an incoming group call with emergency priority, the display will show that an
Emergency call has been received, and a special audio alert will be sounded.
The audio for an emergency group call will always sound through the speaker (high audio), even if
the low audio is selected.
An Emergency Group Call is configured as non-tactical or tactical:
• A non-tactical call initiates on a talkgroup designated by the codeplug setting. After exiting
from non-tactical emergency mode the terminal will be attached to the group that was
selected before initiating the non-tactical call. When in non-tactical emergency mode, the
user will not be able to switch talkgroups.
DGNA messages have no impact during non-tactical emergency mode but only after exiting
the non-tactical emergency mode.
• A tactical call initiates on the currently selected talkgroup.
5.1.4 Hot Microphone
This is a programmable option in the terminal. If enabled and the terminal enters emergency mode
and sets up an Emergency Group Call, the microphone will automatically open and allow the user to
talk without having to press the PTT button. Transmission is allowed for a pre-programmed period of
time, after which the user must press the emergency button to restore the Hot Mic. functionality.
Pressing the PTT during the Hot Mic operational period will end the Hot Mic functionality and the
terminal will revert to normal PTT voice operation.
If during an ongoing emergency call another terminal activates emergency within the same group
the first emergency call will be interrupted after a pre programmed time. The hotmike function
toggles between the first terminal and the second one in emergency stage triggered by the pending
timers until the duration timers are expired. All timers are set by CPS.
During the hot microphone phase the gain of the microphone can be altered automatically.
Benefits:
❏ Instant high priority access to the group - no emergency call gets lost
❏ Dispatcher is notified via emergency status - can react immediately
❏ The emergency group is notified of the emergency situation via a tone and the display - the
are immediately aware of it and can start to investigate for help
❏ ”Hot mic” enables the user to call for help without touching the terminal
❏ Increased microphone gain during emergency phase enables the user to talk without being
close to the terminal
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