How to Convert a Phone Jack to an Ethernet Jack

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A DSL modem enables a computer to connect to the Internet. A telephone line must be plugged into the DSL modem in order to send and receive online signals. To convert a phone jack into an Ethernet jack that can be connected to a computer, install a DSL modem using the telephone jack in your home. A few supplies from an electronics shop are needed.

Things You'll Need

  • DSL modem/DSL modem power supply
  • Modular telephone cord, 10 feet
  • Ethernet cable, 6 feet
  • Computer
  • Place the DSL modem next to the computer that will be used to access the Internet. Insert the DSL's power supply AC plug into a wall outlet. Plug the power supply's power port cable into the AC port on the back of the modem.

  • Insert the modular plug at one end of a modular telephone cord into the modular socket on the telephone jack; the jack most likely is on a plate at the bottom of the wall, up against the baseboard. Insert the modular plug at the other end of the cord into the "DSL"-labeled modular socket on the back of the modem.

  • Insert the Ethernet plug at one end of an Ethernet cable into the "Ethernet"- or "Network"-labeled socket on the back of the modem; the tab on the Ethernet plug must be lined up with the slot on the top or bottom edge of the socket if the two are to connect properly.

  • Insert the Ethernet plug at the other end of the Ethernet cable into the "Ethernet"- or "Network"-labeled socket on the back of computer -- again lining up the tab on the Ethernet plug with the slot in the computer's socket.

Tips & Warnings

  • Do not use lengths greater than 10 to 15 feet for the telephone cord as this could lessen the DSL signal strength going into the modem.
  • The DSL modem must be registered by an Internet Service Provider (ISP) in order to function online; a subscription to the ISP is required.

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