Supplementary Services 2-45
March 2009 Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual 6866588D21-D
14.3.6 Group Management AT Commands
The terminal supports the following AT Command for support of Group Management:
• Talkgroup selection (+CTGS)
14.3.7 DMO AT Commands
The terminal supports the following AT Command for support of DMO:
• Visible DMO Gateway or Repeater (+CTDGR)
14.3.8 USB Support
The terminal supports flashing of the software, codeplug and encryption material via USB interface.
15 Supplementary Services
Following is the description of the TETRA Supplementary Services (SS) that the terminal should
support in TMO Mode.
15.1 Dynamic Group Number Assignment (DGNA)
The terminal supports dynamic addition and removal of talkgroups in its talkgroup list via TETRA
Dynamic Group Number Assignment and De-assignment signalling (SS-DGNA). The terminal will
respond to DGNA directed to it or to DGNA directed to a group it is attached to.
15.1.1 Adding a Talkgroup
When a dynamic group number assignment to add a new talkgroup is received, the terminal will add
the group in the first available spot in the talkgroup list in the codeplug. The user can then scroll to
the talkgroup to select the group.
The groups can be assigned as not attached, attached as scanned or attached as selected.
Assignment of the group through DGNA with attached as selected will make it the selected group of
the terminal. If the group is assigned with attached as scanned, if it is not already in the currently
active scan list, the terminal will add this group to a SwMI Controlled scan list and will begin
monitoring downlink signalling addressed to this group. The SwMI controlled list will hold up to 10
groups, and the terminal will monitor these groups as well as groups in the user scan list.
If the talkgroup list is full when adding a new group, the assignment operation will be rejected by the
terminal. If the SwMI controlled list is full and the assignment is with attached as scanned, the
attachment will be rejected.
15.1.2 Removing a Talkgroup
When a dynamic group number de-assignment is received, the talkgroup will be removed from the
talkgroup list in the codeplug. If the selected talkgroup is de-assigned, the terminal will show that
there is no selected group.
15.1.3 DGNA Notification to the User
When DGNA operation is successful, if the terminal is provisioned for DGNA user notification, the
user will be notified about the operation (for example group added, group deleted). The notification
to the user will be displayed until it is confirmed by the user. In case the user receives a call, the
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