How to Wire a Cat5 Cable to a Phone Junction

Written by dustin thornton
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How to Wire a Cat5 Cable to a Phone Junction
Cat5 cable can replace standard telephone wires. (ethernet cable 4 image by BlueMiniu from Fotolia.com)

Home telephones use low-voltage wiring, making phone wiring a relatively safe task for a capable homeowner. Voltage for the phone comes directly from the phone carrier, instead of the electrical lines, and a Demarc box distributes the phone line to a series of phone jacks. The problem with this set-up is if one phone jack malfunctions, each phone jack in the series will stop working. You can add a junction box to your home that acts like a network hub, keeping each phone jack independent, and wire it using Category 5 (Cat5) cable. This type is preferred because of its superior data transfer capability.

Skill level:
Moderate

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Things you need

  • Measuring tape
  • Wire cutters
  • Screwdriver
  • Combination tool

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Instructions

  1. 1

    Measure the length of Cat5 cable you need to wire each modular jack to the phone junction. Note that each modular jack connected to the junction requires a separate Cat5 cable. Run each Cat5 cable from the phone junction through the walls to its corresponding modular jack.

  2. 2

    Open the cover of the first modular jack by turning the mounting screws counterclockwise. There will be four, six or eight separate screws within the modular jack, each connected to specific coloured wires.

  3. 3

    Strip approximately 1/2 inch of the plastic sheath off the end of the Cat5 cable with a combination tool. There are four twisted pairs of wire (eight wires total) that run through the Cat5 cable. Strip 1/4 inch of insulation off the blue wire and blue/white wire.

  4. 4

    Locate the screws in the modular jack connected to the red and green wires. Loosen the screws.

  5. 5

    Wrap the exposed end of the blue wire from the Cat5 cable to the red wire screw and the blue/white wire to the green wire screw. Tighten the screws and wrap the other six Cat5 wires around the Cat5 cable and secure them with electrical tape.

  6. 6

    Replace the cover of the modular jack.

  7. 7

    Open the cover of the phone junction by turning the mounting screws counterclockwise. There will be several colour-coded screws inside the junction box.

  8. 8

    Strip approximately 1/2 inch of the plastic sheath off the other end of the Cat5 cable with a combination tool. Strip 1/4 inch of insulation off the blue wire and blue/white wire.

  9. 9

    Loosen the red and green screws in the junction. Wrap the exposed end of the blue wire from the Cat5 cable to the red wire screw and the blue/white wire to the green wire screw. Tighten the screws.

  10. 10

    Wrap the other six Cat5 wires around the Cat5 cable and secure them with electrical tape. Replace the cover of the junction.

  11. 11

    Repeat the steps for additional modular jacks, using separate Cat5 cables.

Tips and warnings

  • The colour of wires you choose to connect from the Cat5 cable does not matter, as long as you consistently connect the same coloured wires to the same coloured screws on both the modular jack and phone junction. For example, you can use the green wire and green/white wire instead of the blue and blue/white wire.

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