Motorola MTP850 Ex Product Information Manual page 88

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message will continue to be displayed until the user confirms it. (The motivation is to make sure that
user could see the notification).
Upon viewing an assigned talkgroup notification, the terminal will provide the ability for the user to
make that group the selected group.
15.1.4 Group Addressed DGNA
The terminal supports Group Addressed DGNA mechanisms.
The terminal supports the reception of a DGNA Assignment that is addressed to its selected
talkgroup as a SuperGroup of the selected group. All signalling addressed to the SuperGroup will
be monitored in addition to signalling addressed to the selected group, any announcement or
associated groups, and groups in the active scan lists.
When the selected group is unselected, the terminal will cease processing signalling to the
SuperGroup that was associated with that selected group.
The lifetime of the SuperGroup is received by the terminal as part of the assignment signalling. If a
subsequent assignment to the same group is not received within that lifetime, the terminal will cease
monitoring that supergroup.
The terminal also supports SuperGroups of scanned groups, such that a group addressed DGNA
assignment received on one of the user scan group addresses, will cause the terminal to monitor all
signalling addressed to that supergroup as long as the scan group is being monitored, and as long
as the SuperGroup lifetime lasts.
15.1.5 DGNA Limitations
The following DGNA functionality is no supported:
• Call-related DGNA is not supported.
• The terminal does not support functionality of the "authorized user" (described in [Ref 5].
• The terminal does not perform any network authentication before accepting DGNA.
15.1.6 Ambience Listening (AL)
Ambience Listening allows a console operator or dispatcher to monitor audio activity in the vicinity of
a specific terminal without giving any indication to the affected terminal.
15.1.7 SS-AL Setup
When the terminal receives a call setup message with an invocation of Ambience Listening, the
terminal will allow accept the call, open the microphone and begin transmitting, without showing any
indication of the call to the user. Call acceptance and rejection while active in another call will follow
the PPC rules (see Paragraph 15.2 "Pre-emptive Priority Call (PPC)").
15.1.8 Call Maintenance and Termination
The terminal will impose no time limit on the transmission (T311 will be disabled), and will continue
to transmit until the SwMI ends the call or the user performs an action that causes the call to be
released.
15.1.9 User Interactions
If the user attempts to start a service while the SS-AL call is in progress, the terminal will disconnect
the call and initiate the service that the user has requested.
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
Services and Feature Description
March 2009