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MN004519A01-AK
Chapter 3: Modes
3.3.9
Communication Through Gateways
Gateway provides connectivity between radios operating in Direct Mode Operation (DMO) and the
TETRA network, so that the DMO radios can communicate with the Trunked Mode Operation (TMO)
radios.
Figure 19: Communication Through Gateways
Radio behavior when radio connects to a gateway:
•
A tone is sound.
•
Gateway available message is displayed.
•
An appropriate icon is shown.
Radio behavior when radio loses connection with the gateway:
•
A tone is sound.
•
Gateway not available message is displayed.
•
The gateway icon is blinking.
3.3.10
Gateway and Repeater Synchronization
To communicate using gateways or repeaters, the radio requires synchronization with a gateway or a
repeater.
A gateway or a repeater sends presence signals to radios. If a radio receives presence signals, it stays
synchronized with the gateway or the repeater which sends the signals. If a radio fails to receive a
presence signal it does not immediately lose synchronization. The radio waits for another successful
presence for a time defined by your service provider. This function ensures that communications are
not dropped due to temporary reception issues.
If a gateway or a repeater is unavailable or the radio is not synchronized with a gateway or a repeater,
depending on the setup configured by your service provider, the following scenarios apply:
•
The radio falls back to Direct Mode Operation (DMO).
•
After pressing the PTT button, a prompt appears warning that the second press overrides the
gateway or repeater operation mode.
•
No direct DMO communications are permitted.
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TMO
TMO
DMO
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