Chapter 4: Configuration with web interface
98-148232-E Optional: To set up cellular network for data 96
EXPLORER 540 operation in “Cellular modem preferred” mode
Normal operation
When Cellular modem preferred is selected under Terminal settings, the Automatic
Context Activation (ACA) is mandatory and the EXPLORER 540 will persistently attempt to
establish a data connection for both the cellular modem and the BGAN air interface.
If both data connections are successfully established, the cellular data connection will be used
as the primary connection (indicated on the Web interface under Terminal status, Network
in use). The BGAN data connection will be ready as backup.
The EXPLORER 540 will now route all data traffic via the cellular connection. It will monitor the
status of both the cellular and backup BGAN connections. If the Connection watchdog or the
Terminal watchdog is enabled, this function will also be used to monitor and verify
connectivity of the Cellular connection.
Limitations in Cellular modem preferred mode
• ACA is mandatory for both Cellular and BGAN connections.
• Streaming is not allowed as a BGAN backup connection.
• Remote Activate/Deactivate of BGAN connections is not supported.
• AT command control of the Cellular connection is not supported.
• PPPoE control of the Cellular connection is not supported.
• Use of Data limits is not supported for the Cellular connection.
If the cellular connection fails in Cellular preferred mode
If the EXPLORER 540 detects that the cellular connection is failing, it will immediately switch
the traffic to the BGAN connection, which now becomes the "Network in use".
After a switch to the BGAN backup connection the EXPLORER 540 will try to recover the
Cellular data connection. If the Cellular data connection is successfully re-established, the
EXPLORER 540 will start to monitor and validate the Cellular connection. If the connection
watchdog is enabled, the EXPLORER 540 will monitor and verify connectivity for 20 min.
If the Cellular connection is to be used for remote access to the E540 (or attached
equipment) the Cellular USIM should have a "Static/Global IP address" that can be
accessed from the WAN side. If not, once the EXPLORER 540 is connected to the
cellular network, you can get the global IP address with the SMS command GETINFO,
see GETINFO: Get information from the EXPLORER 540 on page 27.
Alternatively, you may set up a PRISM server and use PRISM technology. See
EXPLORER 540 operation in Cellular modem preferred (PRISM) mode on page 97.
After terminal start-up or initial activation of Cellular modem preferred mode, the
EXPLORER 540 will allow the Cellular connection a period of 3 min. to become
operational before it is considered failing and the EXPLORER 540 switches to the
BGAN connection.
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