Billion M500 User Manual page 76

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Failover & Priority
WAN Port Service Detection Policy
WAN1: Select "4G/LTE-1", "4G/LTE 2", "EWAN" or "Wireless Client" for WAN1 (The main WAN).
WAN2: Select the "4G/LTE-2", "EWAN" or "Wireless Client" for WAN2 as backup port if you select
"4G/LTE-1" as WAN1.
Connectivity Decision: Set how many times of probing failure to switch to backup port.
Priority by: The condition is signal strength. Switch to the WAN port which has good signal strength.
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