Wiring a Wall Type RJ45 Jack
DJ Delorie wrote:
"One thing that I have noticed though is that in CAT5e, the orange
and green pairs are twisted tighter than the blue and brown
pairs. So do not expect to get the CAT5e quality on the network drop
using the split pairs (brown and blue)."
I guess that's to reduce cross-talk between pairs, at the expense of
lower immunity to external interference.
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