networking - Can I hook up another internet router to the phone line from the wall when the main router+modem is connected upstairs? - Super User
Amazon.com: Keple RJ11 Cable ADSL 10ft Extension Lead Phone Cord Telephone Plug High Speed Xfinity Internet Broadband Male to Male Router and Modem to RJ11 Phone Socket/Microfilter/Landline Wire (Black) : Electronics
How to Set Up a Wireless Router | Digital Trends
Can routers connect to ADSL through an RJ-45 cable instead of a phone line? - Quora
Can I Use a Router Without a Modem?
I moved my modem to a new location/jack and now my Internet does not work. - ATC Communications
How Do I Get Internet Service Without Any Phone Jacks? | Techwalla
How to Get Internet Without Cable TV or Home Phone