A telephone jack is a socket into which a connector that is used to connect a telephone to a buildings wiring is plugged. It acts as a hardware interface between the telephone wiring and the telephone, and is considered the counterpart of the telephone plug. It is usually fixed to the wall or baseboard.

What type of connection is a phone jack?

More commonly known as a modem port, phone connector, phone jack or phone line, the Registered Jack-11 (RJ-11) is a four or six wire connection for telephone and Modem connectors in the US. The picture is an example image of what the RJ-11 phone cable and its connection.

Can you run ethernet through a phone line?

Ethernet uses two pairs (four wires), one for send and one for receive. Telephones use two wires. Therefore, you can run both ethernet and telephone over the same wire, and still have two wires left over.