All group attachments sent by the radio are sent with attachment mode of Amendment or Detach all... depending on
which form causes sending less bits over the air interface.
When you turn on scanning and then select the scan list, the radio sends a group attachment request to attach the scan
groups in addition to the selected group. Similarly, when you select an ATG, the radio sends an attachment of the
ATG as the selected group along with the attachment of the associated groups as scan groups. If a group associated
with an ATG is selected, the radio sends an attachment of the ATG as the selected group and as a scan group.
The TETRA TIP provides a facility by which the radio can send a status message to the SwMI to turn scanning off
and on to save air interface signaling.
If the radio is provisioned with this option, when you turn scanning off, the radio sends an appropriate TETRA
signaling. In this state, the radio does not monitor any groups other than the selected group. If you then turn scanning
on, the radio sends an appropriate TETRA signaling and begins monitoring all scanned groups again.
If the radio is not provisioned with this option, you only have an option to deselect the active scan list. However, you
cannot turn off the scanning. Deselection of the user scan list causes a group detachment of the scan list groups sent to
the SwMI. However, the radio continues to scan all other groups (such as ATG associations).
SwMI Initiated Group Attach/Detach
The Switching and Management Infrastructure (SwMI) can send a talkgroup attachment to the radio. The radio will
attach to it, even if this talkgroup had not been programmed in the codeplug.
If the radio receives a SwMI initiated attachment for the group already currently selected, the radio accepts the
attachment, and keeps the group selected.
If the radio receives a SwMI initiated attachment for a group in the currently active scan list, the attachment is
accepted. If it is for a group that is not in the current active scan list, the attachment is rejected.
If the detachment is for the selected group, the display indicates that no group is currently selected. If the detachment
is for a group that is in the scan list, the group remains in the list. However, it is not monitored. If the detachment is
for a group that is in the SwMI controlled list, it is removed from that list.
Private Call
The Private Call, also called point-to-point, or individual call, enables calling between two individuals. No other radio
can hear the conversation. This call type can be carried out in two ways:
• Duplex call (if the system allows), in TMO Mode. Both parties can speak at the same time.
• Simplex call, in TMO or DMO Mode. Only one party can speak at a time.
From your radio, a Private Call can be started using one of the following methods:
• Dialing ISSI number on the idle screen
• By selecting contact from the address book
• By selecting ISSI number from the recent call list
• Using Remote Control feature
• By pressing predefined One Touch Button
• Other
When a DMO Private Call takes place, radios not involved in this call receive the channel busy indication. The radios
are identified using their radio numbers.
Simplex Private Call
The radio is able to make and receive private calls to and from other TETRA radios with simplex speech capability.
This call type uses TETRA individual call signaling.
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