If you run a lot of Ethernet cable, it is usually cheaper to build your own. Building Ethernet cables in bulk is easy and inexpensive. All you need is a crimper, jacks, cable, and a pair of scissors or cable cutter/stripper.

There are two standards for Ethernet cables, TIA568A (ISDN) and TIA568B(AT&T). There is no real different between the two and for internal networking, pick one and stick with it. Most commercial cables that I have seen follow 568B. Though there does seem to be a push to move to 568A.

  1. Measure out a length of cable to meet your needs
  2. Strip off about an inch of the Ethernet cable sheath, be careful not to cut the conductors
  3. Untwist the pairs
  4. Align the colored wires according to the wiring diagrams below and the standard you are following.
  5. Insert the wires into the RJ45 plug to make sure they line up
  6. Remove the wires from the plug and trim so that they are all even and the sheath can be fully inserted in the plug
  7. Insert the wires into the RJ45 plug again, check the wires are in the correct locations and the sheath is fully inserted
  8. Crimp the plug with the crimper tool
  9. Verify that the sheath is held in place by the crimp and the wires made contact with the metal contacts
  10. Repeat with other side
Pin T568A Pair T568B Pair Wire T568A Color T568B Color Pins on plug face (socket is reversed)
1 3 2 tip Pair 3 Tip
white/green stripe
Pair 2 Tip
white/orange stripe
2 3 2 ring Pair 3 Ring
green solid
Pair 2 Ring
orange solid
3 2 3 tip Pair 2 Tip
white/orange stripe
Pair 3 Tip
white/green stripe
4 1 1 ring Pair 1 Ring
blue solid
Pair 1 Ring
blue solid
5 1 1 tip Pair 1 Tip
white/blue stripe
Pair 1 Tip
white/blue stripe
6 2 3 ring Pair 2 Ring
orange solid
Pair 3 Ring
green solid
7 4 4 tip Pair 4 Tip
white/brown stripe
Pair 4 Tip
white/brown stripe
8 4 4 ring Pair 4 Ring
brown solid
Pair 4 Ring
brown solid
Wikipedia

References:
Ethernet crossover cable
How to Make a Network Cable
How To Make Your Own Ethernet Cables
How to wire Ethernet Cables
TIA/EIA-568
UTP Cable Termination Standards 568A Vs 568B

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