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CAT-5 Wiring Diagram & Crossover Cable Diagram

The following CAT5 wiring diagram and crossover cable diagram will teach an installer how to correctly assemble a CAT-5 cable RJ45 connectors for regular network cables as well as crossover cables. The first set of instructions are for standard network patch cables (EIA/TIA-568B). EIA/TIA-568B, also known as standard Ethernet, is the type of CAT-5 connection used to connect IP security cameras and network video recorders (NVRs) in IP surveillance systems. If you are creating a crossover cable, please click here for the crossover cable diagram.

  1. Using an cat5 cutter and crimping tool, strip about 1/3"of the out jacket of the cat-5 cable. Be sure not to strip or damage any of the pairs of inner cables.

    Cut Cat-5 Cable
  2. Assemble the pairs of wires in the following order for network cables (EAI standard / TIA-568B).

    CAT-5 Wiring Diagram
  3. Insert the wires into the RJ45 jack as seen below. Be sure to keep the wires in the correct order.

    CAT-5 to RJ45
  4. Insert the RJ45 connector into the crimping tool (again carefully make sure the wires stay inserted in the correct order). Crimp down firmly on the crimping tool to permanently attach the RJ45 to the CAT5 cable.

    Crimp RJ45

Crossover Cable Diagram

To create a crossover cable with cat-5 cable follow the same instructions as above for CAT-5 wiring except when you get to step #2, use the below crossover cable diagram:

Crossover Cable Diagram

Mike Haldas


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