Supplementary Services; Dynamic Group Number Assignment - Motorola MTP850 S Product Information Manual

58 | Services and Features
• Packet data
• SDS data
Depending on the codeplug configuration, the radio may indicate entering the LST with the following notifications:
• Visible and audible
• Visible
• Audible
• None
To avoid unnecessary roaming and reduce congestion, Local Site Trunking Ignoring feature can be enabled. When
Local Site Trunking Ignoring feature is enabled, the radio will temporarily ignore the LST/WST parameter when
selecting a site. However, the radio will still take other parameters (such as the cell's RSSI level) into consideration
when deciding on roaming.
Local Site Trunking Ignoring is a selling feature.

Supplementary Services

Following is the description of the TETRA Supplementary Services (SS) that the radio supports in the TMO.

Dynamic Group Number Assignment

The radio supports dynamic addition and removal of talkgroups in its talkgroup list through TETRA Dynamic Group
Number Assignment (DGNA) and De-assignment signaling (SS-DGNA).
The radio responds to DGNA directed to it or to DGNA directed to a group the radio is attached to.
When a dynamic group number assignment to add a new talkgroup is received, the radio adds the group in the first
available spot in the talkgroup list in the codeplug. Then you can scroll to the talkgroup to select the group. The
codeplug determines which DGNA operations are allowed for a group.
Depending on the group type the following is allowed:
• Static – only selection is allowed.
• Semi-Static – selection and reassignment are allowed.
• Dynamic – selection, deassignment, and reassignment are allowed.
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 makes it the selected group of the radio. If the group is assigned with
attached as scanned, if it is not already in the currently active scan list, the radio adds this group to a SwMI Controlled
scan list and begins monitoring downlink signaling addressed to this group. The SwMI controlled list holds up to ten
groups, and the radio monitors these groups as well as groups in the user scan list.
If the talkgroup list is full when adding a new group, the radio rejects the assignment operation. If the SwMI
controlled list is full and the assignment is with attached as scanned, the attachment is rejected.
When a talkgroup de-assignment is received, depending on the codeplug settings (DGNA Operations field in the
Talkgroup List) the radio behavior is as follows:
• If the DGNA Operations field is set to Static or Semi-Static, the radio;
- leaves the talkgroup and the parameters assignments to folders unchanged.
- sends an acknowledgment PDU with notification the group definition has been removed.
• If the DGNA Operations field is set to Dynamic or if the group is not in the talkgroup list, the radio;
- removes the talkgroup from the talkgroup list (if the talkgroup is in the list).
- removes all the occurrences of the talkgroup from the folder list.
- sends an acknowledgment PDU with notification the group definition has been removed (also if the talkgroup
has been deleted, or the talkgroup does not exist in the radio).
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