M2M IDG500AM-0T001 User Manual page 61

M2M Cellular Gateway
 Dual SIM Failover Scenario:
If your purchased product has one or more embedded 3G/LTE module, and they have dual SIMs
to be used as connection profiles to connect to mobile system for each 3G/LTE module. But please
be noted, only one SIM card is used for a 3G/LTE module. Failover and Seamless Failover scenarios
mentioned above are interacted between multiple interfaces. One embedded 3G/LTE module
creates only one WAN interface, even it has dual SIMs. A special failover mechanism between
using both SIM cards to connect to mobile system is presented here. It is called as Dual SIM
Failover.
In this Dual SIM Failover, there are four kinds of SIM card usage scenarios, including "SIM‐A First",
"SIM‐B First", and "SIM‐A Only and "SIM‐B Only". By default, "SIM‐A First" scenario is used to
connect to mobile system for data transfer. So in the case when "SIM‐A Only" or "SIM‐B Only" is
used, the specified SIM slot card is the only one to be used for negotiation parameters between
gateway device and mobile base station. However, in the case of "SIM‐A First" or "SIM‐B First"
scenario, the gateway will try to connect to the Internet by using SIM‐A or SIM‐B card first. And
when the connection is broken, gateway system will switch to use the other SIM card for an
alternate automatically and will not switch back to use original SIM card except current SIM
connection is also broken. That is, SIM‐A and SIM‐B are used iteratively, but either one will keep
being used for data transfer when current connection is still alive.
Following 3 tables list the parameter configuration for the Dual SIM failover scenario. Other
settings that don't show out in the tables, please leave them as default values.
Index skipping is used to reserve slots for new function insertion, when required.
ISP
① Disconnected
DSLAM
② Failover
Cellular Network
ISP
DSLAM ④ Connection Back
⑥ Failback: Change
Routing back via WAN-1
Cellular Network
Gateway
WAN‐1: ADSL
WAN‐2: 3G/4G
③ Change Routing via WAN-2
Gateway
WAN‐1: ADSL
WAN‐2: 3G/4G
⑤ Leave it Keep Alive
Failover
Failback
61