This is an awesome modem/router. These are hard to find and they work great.
Primary DSL with fail-over to Broadband (for use with your USB broadband modem). Note: 4G USB modem NOT SUPPLIED!!
For cost-effectiveness, I use DSL. When DSL goes down, this modem/router is smart enough to fail-over to my 4G Broadband USB modem. Just plug in your own USB broadband modem into the modem/router interface. Personal experience: should DSL goes down, my entire house continues to run as if all was well. Very nice for those who have a USB broadband modem. Note: check manufacturer documentation to ensure your USB modem is supported.
Personal note: I like USB broadband modems. When I am home, I plug it into this router's interface for enhanced fail-safe household operation. When I am on the road, I unplug the USB router and take it with me for use with my laptop. Most set-ups like this require a dedicated/stationary broadband gateway.
This YouTube video explains it well:
Click here:
This video explains it well Ideal solution for those that require an enhanced fail-safe internet connection.