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How to Make and Repair Your Own RJ45 Connectors

RJ45 connectors are small square plugs and their associated sockets used for network cabling. Most offices use these for phone and data connections to avoid complicating things by having to have two different types of connections.

Connecting new equipment to the network requires wiring. These can be bought off the shelf, in off-the-shelf form. Inevitably, however, you will sometimes need an odd length of lead or a one-time connection somewhere. In these cases, knowing how to assemble your own RJ45 connections will make your life easier, and you won't have to call an installer or order special cables.

What you'll need

To make your own network cable, you'll need some cable and some connectors, all of which are easily accessible. You'll also need a crimping tool, preferably a tester, to make sure you get the job done right.

If you are installing your own sockets, you will also need a hole-punching tool. You can purchase all the tools you need to assemble the RJ45 connector as a kit.


RJ45 female 8P8C with shell

Making an RJ45 Connector

Okay, so you have everything you need; it only takes seven simple steps to make an RJ45 connector.

Strip the external insulation

First, you need to strip three to five centimeters of external insulation. You can use a crimping tool to perform this operation. Otherwise, use a craft knife and gently turn the blade around the cable, being careful not to cut any of the insulation on the internal cable. When you can see the internal cable around the cut, you can pull off the external insulation.

Straighten the pair of cables

Remove the outer sheath and inside you will find four pairs of twisted wires and a center core. These pairs are colored orange, green, blue, and brown. Gently fold each pair to expose the core. Cut off the exposed portion of the core and discard it. Now gently untangle each pair of exposed wires and straighten the wires.

Trim the wires

At this point you may notice a slight difference in the length of the wires. Place the RJ45 connector against the edge of the outer insulation and trim the wires so that they are flush with the top of the connector.

Push the wires into the connector

Now you can push the wires into the connector, making sure they remain in the correct color sequence and that each one goes into its own channel. Note that there is no need to strip the insulation from these wires, the connector is designed so that its pins bite into the insulation when crimped. Make sure the wires are properly connected to the top of the connector.


Height Increased Connector RJ45 female 8P8C

Crimping the connector

Now place your connector into the crimping tool and squeeze it to lock everything together. You can now repeat the process at the other end of the cable.

Test your connection

Finally, use your cable tester to check that you have a good connection. If there is an error, try re-crimping the connector. If your first attempt fails, do not worry, try again until it is correct.

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