If it's any help, you only need four of the eight connectors for computer
work. Also, once the connector checks out, we fill the back of the connector
with hot glue.
We finally gave up on that shit (unless it's a really long run) and buy
cables from Cyberguys.
coiled up in a dead space, that it usually isn't worth the hassle to
roll your own, unless you just want to know you can. Mebbe if you do it
all day every day- but for us once-in-a-blue-moon folks with aging
eyesight- well, I've only got so many years left.
I probably wouldn't coil it up (although I doubt it'll make a
difference) -- no need to tempt the fates with extra inductance.
But an extra 20 feet is not an issue by itself unless you're running
near the length limits.
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CAT 5 only describes the performance characteristics of the cable. It
has nothing to do with how many pairs are in the cable. And using all
pairs of 4 pair cable is not unusual in computer work with GigE being
the most common current example.
Sure, you can get 2 pair or 50 pair. Two pair is not commonly used
because the install would save a couple pennies and it isn't standard
practice. And you would be shooting yourself in the foot if you wanted
to say use GigE which uses 4 pairs.
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