It's not difficult to build.
The tool what we need is the Crimping Tool. We can buy it from computer network accessories store. Now the price is various from expensive to very cheap price.
The Cable can be used cat5 or cat6 UTP cable. And using the standard Rj-45 Connector. Those can we get from the computer network and accessories store.
Take out the outside of UTP Cable using cutter on crimping tool (or you can use a scissor)
Sort the cables (8 cables) by color from left to right
Cut the cables using cutter of crimping tool (to make a flat and parallel and easy for inserting cables to the Rj-45 connector)
Insert the cables to the RJ-45 connector ,( make sure the cables arrangement/color not change)
Make sure all the cables touch the edge of the Rj-45 conector
Crimp the Connector
For detail you can see the video, how to build the LAN cable using standard Rj-45 connector.
Youtube link : https://youtu.be/Cs7l8F_8KXc
See also : Cross over UTP Cable Configuration
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