Feature Flags 3-47
March 2009 Chapter 3 - MTP850 Ex/MTP810 Ex Product Information Manual 6866588D21-D
transmission request is not allowed, it will enter the Hot Mic Tx Pending state, but not start the timer.
When the other terminal ceases transmission or the Hot Mic Pending Timer expires, it will re-request
transmission.
If the PTT is pressed in the Hot Mic Tx Pending state, the terminal will send a request to transmit
and cancel Hot Mic operation; normal mic gain will be restored, the Hot Mic Duration Timer and Hot
Mic Pending Timer will be cancelled and transmission will follow PTT operation as for normal
emergency group calls.
If the emergency button/key is pressed when in Emergency Mode Idle (in other words the terminal is
in Emergency Mode, but there is no active call), an emergency alarm will be sent and the Hot Mic
operation will be initiated.
In Emergency Mode the Terminal also accepts normal group calls. If it is in Emergency Mode
listening to a normal group call and if the emergency button/key is pressed in the receive state (in
other words listening to another user talking) or in the hang-time state (there is no talker), the
terminal will leave the call, send an emergency alarm and setup a new hot-mic emergency call to the
current group.
If the emergency button/switch/key is pressed when the terminal is in Emergency mode in an
emergency group call in the receive state (that is another user is talking) or in the hang-time state (in
other words there is no talker), the terminal will initiate Hot Mic transmission by sending an
appropriate PDU with request to transmit with Tx Demand Priority set to ‘Emergency Pre-emptive
Priority level’.
Note: The Emergency alarm is not sent in this case as it would prevent the terminal from
interrupting the current talker since the terminal would have to leave the call and try to setup a
new call after the alarm is completed. In this case the Dimetra IP system will not grant tx
permission.
If the terminal is involved in an announcement group call or is still within the Rx-timer period of an
announcement group call when the hot-mic transmission is initiated, the Hot Mic group call will be
made to the Announcement Group.
Note: In normal circumstances there will not be a case of Rx-hold timer in an emergency call, since
the hang timer on the call is very long and the Rx-hold Timer starts when Tx-ceased is received.
Note: Hot Mic functionality does not work when the terminal is in the DMO operational mode.
Related field is:
Paragraph 22.1 "Hot Mic"
14.18 DMO Gateway
This feature allows the terminal to work with DMO Gateway(s).
The DMO Gateway is a device that provides gateway connectivity between terminal and the TETRA
Voice and Data (V+D) network. The gateway provides the interface between the TETRA DMO and
TETRA V+D modes. A gateway may provide only the gateway function (DM-GATE) or may provide
the functions of both a DM repeater and a DM gateway during a call (DM-REP/GATE).
This feature can be Enable/Disable by clicking in the check box.
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