3-46 Customer Programming Software (CPS)
6866537D87-F Chapter 3 - MTM800 Product Information Manual September 2008
In the cases where the timer expires or the user presses the end key, the terminal will send a U-TX-
CEASED message to the system and remain in the call.
In all cases, the mic gain will be restored to its normal value, the Hot Mic Duration Timer and Hot Mic
Pending Timer will be cancelled.
If during the call, the terminal receives a D-RELEASE from the SwMI (system), it will stop Hot Mic
transmission if is transmitting, cancel the Hot Mic Duration Timer and Hot Mic Pending Time (if they
are active) and restore the mic gain to its normal operational value.
If, upon requesting a hot-mic call, the terminal receives a response that transmission was granted to
another, it will sound an emergency received tone and enter the call.
If the Transmission Request Permission is set to ’allowed to request for transmission’, the terminal
will then start a ’Hot Mic Pending Timer’. If the transmission request is not allowed, or if the Hot Mic
Pending Timer is disabled, it will go into the Hot Mic Tx Pending state and not start the timer.
In this case the Hot Mic Pending state will end only when the other party stops transmitting.
The terminal will be in a Hot Mic Tx Pending state if the user takes no action and will remain in this
state until either the Hot Mic Pending Timer expires, or until the other terminal stops transmitting.
The Hot Mic Duration Timer will not be started until the first ’Tx Granted’ message is received.
If, in the Hot Mic Tx Pending state, the transmitting terminal stops transmitting, or the Hot Mic
Pending Timer expires, then the terminal will send a transmission request with Tx Demand Priority
set to ‘Emergency Pre-emptive Priority’. If transmission is granted, the terminal will start Hot Mic
transmission, but will not restart the Hot Mic Duration Timer.
If during Hot Mic transmission, it receives a signal that tx permission was granted to another user, it
will stop transmitting and sound the incoming voice alert. If the Transmission Request Permission is
set to ‘allowed to request for transmission’, the terminal will start the Hot Mic Pending Timer. If
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 (i.e. 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 (i.e.
listening to another user talking) or in the hang-time state (i.e. 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 (i.e. another user is talking) or in the hang-time state (i.e.
there is no talker), the terminal will initiate Hot Mic transmission by sending a U-TX-DEMAND 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.
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