Motorola MTP850 Ex Product Information Manual page 52

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If the SwMI instructs the terminal to detach one of the scanned groups, that terminal stops
monitoring the group, but the group will remain in the user scan list. Subsequent attachment by the
SwMI will cause the terminal to begin to monitor that group again.
The SwMI may also instruct the terminal to attach groups that is not in the user scan list (see
Paragraph 2.2.10 "SwMI Initiated Group Attach/Detach" and Paragraph 15.1.1 "Adding a
Talkgroup"). If the group attachment is accepted, the terminal monitors the group, and up to 10 such
'SwMI controlled' groups, in addition to the groups in the user scan list.
2.1.14 Priority Monitor
While the terminal is active in a group call, it may receive a group call setup for a different group.
The terminal needs to decide whether to ignore the new call or accept it based on priority of the
current call and the new call. If the new call has a higher priority than the current call, the new call
may be joined and the current call dropped.
There are 2 types priority.
• Call priority (indicated in the call setup signalling)
• Priority of the group (indicated by the Class of Usage - CoU - negotiated upon attachment)
If the old call and new call have different call priorities, the terminal will follow the call with the higher
call priority (See Paragraph 15.2 "Pre-emptive Priority Call (PPC)"). If the calls have the same call
priority the CoU priority of the group will be used.
If the terminal is active in a group call, and detects a call setup for a different group call with the
same call priority, and the new call is for a group with a higher group priority (CoU), if the user is not
currently the talking party the terminal will join the new call.
The terminal can be provisioned to not immediately join the new higher priority call but to present the
new call to the user before joining it. If so provisioned, the user is given a choice of following the new
higher priority call or staying with the present call.
The terminal can be provisioned to treat a selected group call as a higher priority than an scan group
call regardless of the priority of the calls or the groups.
2.1.15 Announcement TalkGroup (ATG)
The terminal supports the concept of a group hierarchy, such that a special group, an
announcement group, in addition to being a group in and of itself, logically contains up to 20
subgroups. When the user selects an announcement group as the selected group, the terminal will
monitor traffic received for the announcement group as well as the traffic received for any of the
associated subgroups. However, the terminal will not monitor the active scan list groups when an
announcement group is selected.
When the user selects one of the subgroups of the announcement group, the traffic for the subgroup
will be monitored as well as the traffic for its announcement group (but not other subgroups).
The terminal can be provisioned to not allow the user to initiate a call or talk back on announcement
talk groups.
2.1.16 Super Groups
See Paragraph 15.1.4 "Group Addressed DGNA".
2.1.17 Broadcast Call
The terminal will join calls received with Communication Type "Broadcast" and will display to the
user that this is a broadcast call. This call will normally be addressed to the 'broadcast address'
(0xFFFFFF), but will be accepted by the terminal on any address the terminal is monitoring.
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual
Services and Feature Description
March 2009