Sierra Wireless AirLink RV50 Series User Manual page 74

ALEOS 4.9.0 Software Configuration User Guide for AirLink RV50 Series
Rev 1 Dec. 17
If you intend to use Active SIM-based Firmware Switching, disable the Scan Timeout by
setting it to 0. This ensures the firmware image switch does not take place if the gateway
cannot connect to the secondary network.
Service loss example
In this example, the desired outcome is to use the primary SIM (for example, a
less expensive network connection) whenever possible, but if necessary, to switch
to the secondary SIM to maintain the data connection.
The Network Watchdog and Cellular Watchdog are both disabled, which enables
SIM switching to persist. The watchdogs may prompt the gateway to reboot,
which causes the gateway to revert to using the primary SIM card.
Note: If Active SIM Based Firmware Switching is enabled, switching to the secondary SIM
also loads the appropriate radio module firmware for the secondary SIM card. As well, if
Active SIM Based Firmware Switching is enabled, the Secondary Network Timeout
changes from minutes (as shown in
Figure 4-7: ACEmanager: WAN/Cellular > Automatic SIM Switching
With this configuration:
If the gateway loses the data connection on the primary SIM for 20 minutes, it
switches to the secondary SIM.
Note: If Active SIM Based Firmware Switching is enabled, switching to the secondary SIM
also loads the appropriate radio module firmware for the secondary SIM card.
If the gateway connects to the network using the secondary SIM, it uses the
secondary SIM for 60 minutes and then attempts again to connect to the primary
SIM's network for another 10 minutes.
If the gateway cannot connect to the secondary network for 10 minutes (the Scan
Timeout), it attempts to reconnect using the primary SIM for another 20 minutes.
Note: The "service loss" used for automatic SIM switching is based on carrier information
about the cellular connection. You have the option of using the Cellular Monitor to trigger
the change in cellular network state. This enhances your network monitoring capability by
sending pings to a configured IP address to confirm your end-to-end connection. If the ping
test fails, then the Service Loss Timeout begins. To configure the Cellular Monitor, see
Cellular > Monitor on page 86.
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Figure 4-7) to hours.
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