3-46 Customer Programming Software (CPS)
6866588D21-D Chapter 3 - MTP850 Ex/MTP810 Ex Product Information Manual March 2009
14.16 Home Mode Display
Enabling this feature will allow the terminal to display pre-programmed information when the
terminal is inactive.
14.17 Group Hot Mic
If enabled and the terminal enters emergency mode to set 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.
If the emergency alarm button, switch or key is pressed during Hot Mic transmission, the emergency
alarm will not be sent, but the Hot Mic Duration Timer will be restarted from the beginning and the
voice transmission can continue.
If the PTT is pressed during Hot Mic transmission, Hot Mic transmission state will end, but the
terminal will continue to transmit in the normal Emergency PTT operation. The Hot Mic Duration
Timer will be cancelled, the normal mic gain will be restored and transmission will be as per normal
emergency group call PTT operation.
Hot Mic transmission will end when:
• the user exits emergency mode.
• the Hot Mic Duration Timer expires.
• the user presses an ’end’ key.
In the case where the user exits emergency mode, the terminal will leave the call.
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
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