How to Make Phone Cables


When a landline telephone doesn't have a long enough cable you will need to buy an extension cable or make one yourself. While a premade cable is convenient, you'll have only limited choices for cable length. Making your own telephone cable lets you tailor the cable exactly to your needs. Best of all, they're easy and inexpensive to make.

Things You'll Need

  • Four-conductor phone cable
  • Wire cutters
  • Wire strippers
  • RJ-11 connectors
  • Crimper
  • Cut a length of four-conductor phone line with wire cutters to your preferred cable length.

  • Strip 3/4-inch of the outer jacket from one end of the phone line. Don't nick or cut any of the four inner wires.

  • Straighten the four inner wires so they run parallel in the following order, left to right: black, red, green, yellow.

  • Place the four inner wires next to an RJ-11 conductor and mark the wires to correspond to the length of the RJ-11 connector. Strip the insulation of the four inner wires with your wire strippers down to this mark.

  • Push the four inner wires into the back opening of the RJ-11 connector. Insert the wires far enough so the ends reach the front edge of the RJ-11 connector.

  • Place the RJ-11 connector into your crimping tool and close the tool firmly to crimp the wires in place. Repeat this process with the other end of the phone line cable to complete your phone cable.

Tips & Warnings

  • Always use RJ-11 phone connectors. RJ-45 jacks look similar but are wider and used for local computer networking.
  • Make several phone cables of varying lengths so that you have a choice of cables on hand if you need to move the phone in the future.


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