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CAT6 Wiring and Installation Instructions

The internal wiring on the CAT5e and CAT6 cables are specifically arranged so that each wire can perform its intended function when connected to certain devices. The table below shows an example of the T568A wiring scheme.


Currently there are two different wiring schemes for ethernet cables. These schemes include the straight through pin out for T568A and the straight through pin out for T568B. The T568A is recommended for use in residential applications because it is backwards compatible with older electronic devices. However, aside from specific contracts requiring that the cables be terminated in a specific way, it is up to the installer to decide to use either T568A or T568B as there are no major differences. 

If I were to write my own instructions on how to build the RJ45 connector on a CAT6 cable, it would be as follows. 

  1. Gather all the necessary tools including:
    1. Wire cutters.
    2. RJ45 connectors.
      1. This should include the liner, sled, and plug body.
    3. Plug crimper. 
    4. Optional: wiremap tester.
  2. Score the outer protective wire on the CAT6 cable. 
    1. Care should be taken to ensure that the inner wires are not scored in the process. 
  3. Trim and discard the center spline within the CAT6 cable. 
  4. Twist the inner wires together according to either the T568A or T568B wiring scheme. 
  5. Slide the RJ45 sled over the twisted wires. 
  6. Untwist all the inner wires and trim utilizing the wire cutters.
    1. Wire length should be between 1/4" and 3/8” after trimming. 
  7. Place the liner over the trimmed wires. 
  8. Insert the liner, sled, and wires into the plug body.
    1. Ensure that the liner, sled, and wires are fully inserted into the plug body before moving on to ensure a positive connection. 
  9. Terminate the plug utilizing a plug crimper. 
  10. Optional: Test the cable utilizing a wiremap tester. 
 

Installation instructions: 

Reference: 
T568a vs T568B, Which to Use. trueCABLE. (2021, September 9). Retrieved March 8, 2022, from https://www.truecable.com/blogs/cable-academy/t568a-vs-t568b

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