How to Wire a Cat-5 for a Telephone Diagram

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Cat-5 or Category 5 cable is mostly used for telephone line wiring as well as for computer network wiring. It has eight 24-gauge (AWG) copper wires grouped into four pairs of twisted wires. Each wire is color-coded and all wires are covered by a single cable jacket. The twisted pair of wires is designed to help to prevent interference from exterior sources. Increase your technical skills and save some cash by learning how to wire phones using Cat-5 cables.

Things You'll Need

  • RJ-14 jack
  • Cat-5 cable
  • Cable stripper
  • Screwdrivers
  • Cable clamps
  • Open the Network Interface Device or NID outside your house. Disconnect the telephone company line by unplugging the modular connector inside the NID. These boxes are commonly mounted on a wall near where the telephone line runs into the house.

  • Slip a Cat-5 cable through the hole at the side of the NID and pull it from inside the box. Strip off two inches of outer cover from the cable using diagonal pliers and straighten out all the inner wires. Connect the following wires to their corresponding terminal screws inside the NID:

    --blue wire with the white marking to the red terminal screw (Line 1);

    --white wire with blue marking to the green terminal screw (Line 1);

    --white wire with orange marking to the black terminal screw (Line 2);

    --orange wire with white marking to the yellow terminal screw (Line 2).

  • Install the Cat-5 cable into your house by running it to the exact location where you will install a telephone. Route the wires along paths that will be easiest to wire. To avoid interference, do not run the wires alongside power lines. Secure the Cat-5 cable by using cable clamps.

  • Grasp the Cat-5 cable and pull it gently out of the wall. Cut the cable, but provide at least an extra foot of line from the wall to the end of the cable to allow for some working space. Strip off 2 inches of its outer cover using diagonal pliers and straighten out the twisted pairs of wires.

  • Uncover the RJ14 surface mount jack by removing the retaining screw on top. Attach the color-coded wires to their matching terminals inside the jack by following the procedures in step 2 above. Replace the jack cover and mount the jack on the wall using a screw or double-sided tape. Reconnect the telephone power by plugging back the modular connector into its jack inside the NID. Plug a working telephone in the newly installed phone jack and call someone to test the line.

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  • Photo Credit netzwerk image by bofotolux from Fotolia.com
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