Smart TVs can be connected to the router either wirelessly via Wi-Fi or through a wired connection using an Ethernet cable. If you're using streaming services such as Netflix or Hulu, connecting your router to your cable box can. If you want to connect your PC or Laptop to wired internet, you have to use an ethernet cable with RJ45 Jack. Even other networking devices such as routers, modems, switches etc. Can You Convert Coax to Ethernet? Before answering this question, let us first see the need. Coax over Ethernet, or Ethernet over coax, is a technology that allows you to convert your TV cabling into a fast home Internet network. This is also known as MoCA technology.