On paper, Cat6 and Cat6a both carry 10 Gigabit Ethernet, so the safe-looking move is to spec whichever the budget allows and move on. That is where it bites. Cat6 quietly gives up 10GbE somewhere past about 55 meters — sooner in a packed cable tray — so a backbone that certified fine on the bench can fail in the riser. Go the other way and over-spec Cat6a everywhere, and you find it is noticeably fatter and stiffer: it fills conduit faster, needs a larger bend radius, costs more per foot, and will not seat in Cat6-rated keystones. Either mistake tends to surface at the worst time — during certification, or after the cable is already in the wall.
This guide compares Cat6 vs Cat6a the way someone speccing a real install has to: how far each carries 10GbE, what alien crosstalk and shielding actually change, the physical and labor cost of Cat6a, and which one a given run needs.
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