The Multimedia over Coax Alliance (MoCA) is the established standard for home entertainment networking. One of the main goals is to bring Internet communications throughout a house on existing wires, like coax.
Channel Master Internet to TV With many TVs and game systems requiring an Ethernet connection, the Channel Master adapter converts the common coax output found in many rooms to bring Internet where you need it. ActionTec Ethernet over Coax Network Adapter & Router ActionTec's Adapter is another option for taking an existing coax network and making it an Ethernet connection. WiPNET by wi3 WiPNET is an in-wall option that takes the existing coax wires and converts the into Ethernet jacks. Future development aims to make each these a wireless access point, as well.