* Crimping tool. Can't really do it without one.
* Side-cutters. If not included in the crimping tool.
* RJ45 connectors.
* Cat 5/6 cable.
* Recommended: Cable tester. Really helps if you're doing a lot.
1. Measure the cable to the correct length and cut.
2. Strip the sheath off using the crimp tools sizer, or about 15mm.
3. There you'll see 4 twisted pairs of sheathed cables. 1 x Orange / Orange-White striped. 1 x Green / Green-White striped, 1 x Brown / Brown-White striped, 1 x Blue / Blue-White striped.
At this point, make sure your boots are on, if you're using them.
Don't forget your booties, it's cold outside!
4. Untwist all 4 pairs about 2 or 3 times, trying to straighten each wire as you do so.
5. If you can get them into the same kind of order as on the right, it will be a bit easier. Don't worry if not.
7. Then get the Blue cables, swap the stripe / plain order back to front, then push in between the Greens.
8. Try to straighten them as much as possible. If you need to trim them with side-cutters, now's the time.
10. Then push all the way home very tightly. Check the wires on the edges are pushed up to the end.
11. Then crimp tightly.
12. And admire your handywork, testing with a tester if you have one.