NetComm NTC-400 Series User Manual page 57

SIM-A/SIM-B only – 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 the router and cellular ISP.
SIM-A / SIM-B first without enable Failback – By default, the router is configured to use "SIM-A First". When "SIM-A First" or
"SIM-B First" are selected, the router will try to connect to the Internet using SIM-A or SIM-B card first and when the
connection is broken, the router will switch to use the other SIM card automatically and will not switch back to use the
original SIM card except where that connection is broken too. That is, SIM-A and SIM-B are used so long as the connection is
still alive.
Figure 61 – SIM-A / SIM-B first without enable Failback
SIM-A / SIM-B first with Failback enable – With Failback option enabled, the router fails over when the primary SIM
connection fails and fails back when it has recovered.
Figure 62 – SIM-A / SIM-B first with enable Failback
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© NetComm Wireless 2019