Ok, after two pages of discussion, somebody tell me why data cables like CAT5 have 4 pairs? That's 50% of the copper you are paying for that isn't used. Very expensive filler. And before somebody says they maintain the transmission characteristics of the cable I say baloney. This is wire that is open on both ends.
My opinion is that they are there to put money in the manufacturers pockets. It started with CAT3 which had applications for all 4 pair and they just ran with it.
-Hal
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