2-8 Services and Feature Description
6866588D21-D Chapter 2 - MTP850 Ex/MTP810 Ex Product Information Manual March 2009
2Group Call (TMO)
The TMO Group Call service enables the terminal to communicate with a group of other TETRA
terminals using ‘point to multi-point’ operation.
The terminal supports "Normal Group Call" as described in the Air Interface standard [Ref 1], clause
14.5.2, and the TIP [Ref 10] clause 9. Acknowledged group call is not supported.
The terminal is capable of monitoring multiple groups at one time, by adding the group identities to
the list of identities which ‘belong to’ this terminal. Signalling received from any of these identities
will be processed by the terminal.
2.1 Terminal Ergonomic features
2.1.1 Programmable Talkgroups
The terminal offers a talkgroup list facility. Each talkgroup entry contains a TETRA group address
and may be associated with a name tag. Up to 2048 TMO talkgroups can be defined in the
codeplug.
Note: Neither the group name nor the corresponding group address are editable by the terminal
user via the MMI.
2.1.2 Talkgroup Folders
The talkgroups are organized in folders. A talkgroup can be chosen by first choosing a folder and
then a talkgroup within the folder. Up to 256 folders can be provisioned. The size of each folder is
flexible and can be defined via provisioning.
Note: The folder definitions cannot be altered by the terminal user via the MMI.
2.1.3 Talkgroup Selection
Talkgroup selection from the stored list of talkgroups in Idle Mode can be performed by scrolling
through the list using the scroll keys or using the rotary knob if it is so provisioned as described in
Paragraph 18.2 "Rotary Knob". TG scrolling can be provisioned to scroll within a folder only or
continuously through the folders acting as one continuous list of groups.
There is no ability to directly dial a group SSI, nor view a group SSI.
2.1.4 Favorite Talkgroups
If the favorite talkgroups feature is provisioned in the terminal, the terminal user can mark and easily
access up to 128 favorite talkgroups which are ‘shortcut’s to talkgroups that already exist in the
talkgroup list. The favorite talkgroup list is stored in non-volatile memory.
The favorite talkgroup list can be a combined list of TMO and DMO groups; When a TMO group is
selected in DMO mode, the terminal automatically switches to TMO mode and select that group.
Similarly, when a DMO group is selected in TMO mode, the terminal automatically switches to DMO
mode and selects that group.
2.1.5 TG Blind Operation
The terminal can be provisioned with a virtual rotary ‘end-stop’ option for use in blind operation. If
this option is provisioned, when the user has scrolled to the beginning or end of the list using the
rotary knob, a tone is sounded and the first/last talkgroup in the list continues to be the displayed
group even if the user continues to scroll in that direction with the rotary knob.
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