Can't detect a problem with the WAN connection and won't switch to the USB modem
"Sorry about my English"
I have one alarm with internet monitoring, and I use the TL-MR3420 to have one connection all the time.
The mr3420 is connected to my home internet and the USB modem is the backup system.
What the MR3420 does:
When I switch off the home DSL or I plug off the rj45 the USB modem gives internet access and I still can monitoring my alarm.
The problem
I have one problem when everything is connected and powered, but I plug off the optical connection of my fiber-optic internet, the MR3420 doesn't switch tho the USB modem, and the monitoring of the alarm doesn't work anymore.
best regards.
Sergio