2-48 Services and Feature Description
6866537D87-F Chapter 2 - MTM800 Product Information Manual September 2008
14 Supplementary Services
Following is the description of the TETRA Supplementary Services (SS) that the terminal supports
in TMO Mode.
14.1 Dynamic Group Number Assignment (DGNA)
The terminal supports the dynamic addition and removal of talkgroups in its talkgroup list via TETRA
Dynamic Group Number Assignment and De-assignment signalling (SS-DGNA). The terminal
responds to the DGNA directed to it, or to the DGNA directed to the group to which it is attached.
14.1.1 Adding a Talkgroup
When a dynamic group number assignment adding a new talkgroup is received, the terminal adds
the group to the end of the talkgroup list in its code plug. The user is then able to scroll to the
talkgroup, select it and attach to the group.
If the dynamic talkgroup list is full when adding a new group, the operation will be rejected by the
terminal.
14.1.2 Removing a Talkgroup.
When a dynamic group number de-assignment is received, the talkgroup will be removed from the
talkgroup list in the terminal’s code plug. When the selected talkgroup is de-assigned, the terminal
will show ‘No Group’.
14.1.3 DGNA Notification to the User
When the DGNA operation is successful, the user will be notified about the operation (e.g. group
added, group deleted). The notification to the user will be displayed until it is acknowledged by the
user and the message will still be displayed during call reception until it is acknowledged. (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 active group.
14.1.4 Selection of DGNA Groups
When viewing a list of new received DGNA groups the user can select any new group right away by
pressing the select button. Previously it could be time consuming to add newly received DGNA
groups.
Benefits:
❏ Ease of use, must faster selection of DGNA groups when initially received
14.1.5 Group Addressed DGNA
The terminal will support Group Addressed DGNA for the purpose of supporting the Dimetra-P
Console Multi Select (MSEL) and Group Patch mechanisms.
The terminal will support the reception of a DGNA Assignment that is addressed to its selected
group as a Super Group of the selected group. All signalling addressed to the Super Group will be
monitored in addition to signalling addressed to the selected group, any announcement or
associated groups and groups in the active scan list.
When the selected group is unselected, the terminal will cease processing signalling to the Super
Group that was associated with that selected group.
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