TalkGroups 3-95
September 2008
Chapter 3 - MTM800 Product Information Manual 6866537D87-F
• to change the parameters or the attachment state of an existing group or groups in the
terminal.
The assignment may require the terminal to immediately attach the group, change its Alias or Class
of Usage or to just add it to the talkgroup list allowing it to be attached later.
The following requirements apply to each group element in the SS-DGNA Assign PDU. If there are
multiple groups in the PDU, the acknowledge for all groups is sent together in one PDU.
For each assigned group, there is an assignment that is a command to add the group to the
terminal’s group list, and may contain instructions to attach the group. The terminal can accept or
reject the assignment. On accepting the assignment the terminal can either accept or reject the
attachment.
Assignment with Auto-select
If Auto-Select Single Assigned Group is enabled, upon receipt of an individually addressed D-
FACILITY PDU containing a DGNA assignment which contains a single group assignment without
an attachment (that is, the Attachment Mode is set to Not Attached, MS user allowed to request
attachment), the terminal processes the assignment as described above, and then automatically
makes that group the selected group (that is ’auto-select’). Specifically, if this group had not already
been the selected group before the assignment was received, the terminal shall send the group
attachment for this group as if the user had manually chosen this group to be the selected group.
The group shall remain the selected group until the user or the SwMI subsequently change the
selected group.
Auto Reselect of Previous Group
When a group is auto-selected, and is then subsequently de-assigned or detached by the SwMI
while the auto-select group is the currently selected group, the terminal automatically reselects the
group previously selected by the user. However, if the user manually changed the selected group
after auto-select and then subsequently reselected the auto-select group, or if there was never a
user-selected group, the behaviour on de-assign of the group will be as the behaviour with any other
group.
No Auto-select with Multiple Groups
If the terminal receives a D-FACILITY PDU containing DGNA assignments for more than one group,
it will be treated as a normal DGNA assignment, and the auto-select parameter will have no effect
on any of the groups.
No Select of Non-selectable
If the single assigned group already exists in the talkgroup list and is defined as non-selectable the
terminal will not auto-select the group.
Assign Non-tactical Emergency Group
If an assignment for the group that is already defined in the codeplug as the non-tactical Emergency
group is received, the terminal will update the name of the non-tactical group with the group name
received in the assignment. The terminal will also treat this as a normal assignment and add the
group to the talkgroup list or modify the parameters of the group if already in that list.
De-assign Non-tactical Emergency Group
If a de-assignment for the group that is defined as the non-tactical Emergency group is received, the
terminal will remove it from the talkgroup list if it is also defined there, but it will remain as valid for
use for non-tactical Emergency group calls.
Auto-select in Non-tactical Emergency Mode
If an assignment is received with Auto-Select Single Assigned Group (enabled) in Non-tactical
Emergency Mode, the assignment will be accepted as normal, but auto-select will not be performed.
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