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Hold the cable so the ends are side-by-side and look carefully at the wire colors. If the 2 ends are identical, it's a straight through cable, if not, it's a crossover.
If you need a crossover, just go buy one. It's cheaper than buying the supplies and tools you need to make one. We no longer make our own patch cords, the machine made ones are always better as they are guaranteed to meet specs. The subcontractor we use to do network cabling feels the same way - he has all the tools, etc. but he will not make patch cords.
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