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Cat 5e vs. cat 6.  Cat 6 doesn't work in some situations?!

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Last Modified: 2014-11-13
My son is at college.  they have LAN connector to network at his desk.

I sent him a cat 6 jumper cable to go from the lan jack to his PC.  he said it didn't work.  he had to use a cat5e cable.  I tested the cat 6 cable and it passes for continuity / straight through, like the cat5e he used.

he said someone else in the dorm said the same thing - cat 6 wouldn't work for them. had to use cat 5e.

I thought cat6 is interchangeable with cat 5e jumpers for a 10 / 100 network?  That anywhere you'd use a 5e jumper, you could use cat 6?  No?!
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