2-18 Services and Feature Description
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual March 2009
5 Emergency Operation (TMO)
This section describes Emergency Operation in TMO Mode.
The terminal has a dedicated emergency button which can be provisioned to start either an
emergency group call or an emergency private call (half-duplex or full-duplex). It is also possible to
invoke emergency by an emergency button on the RSM.
5.1 Emergency Group Operation
5.1.1 Emergency Group Mode
If Emergency Call is provisioned as a group call, upon pressing of the dedicated emergency key (or
RSM button or emergency foot switch if connected) the terminal will enter a special emergency
mode.
Upon entry into Emergency Mode any existing voice call will be aborted or cleared down. Packet
data in progress will be aborted, however the session will be kept open.
In Emergency Mode, the terminal will automatically reject phone, PABX and private calls, and will
not monitor the groups in the user selected scan list. If an ATG is the selected group, however, the
terminal will monitor the sub-groups associated with the ATG.
The terminal will remain in Emergency Mode until the user explicitly exits.
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 only, but is able to
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.
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