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Network cable and switch

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Some switches are 'auto MDX' (auto crossover) and some are not. If you accidentally made a crossover cable, it will work on a switch with auto MDX feature.

Also, some switches are pickier about precisely what voltage and cable characteristics they will accept. Some Ethernet switches also do POE (power over Ethernet) but I don't think that is the issue in this case.

If you make your own patch cables, TrendNET makes a nice tester for under $50