On Jan 22, 2005, at 8:41 PM, Ford Peterson wrote:
One of my pet peeves is when computer technicians wire cat5 cables
incorrectly. There is a right way and a wrong way to do it. The
right way is the most difficult. Guess which way most people do it?
The 8 conductors in that cable are actually 4 pairs of twisted cables.
Each pair is a "hot" and a ground return. When you hook up the
cables to keep the colors all the same on each pin at each end, you
will have conductivity between the correct pins, and the network will
work, but you completely lose any shielding benefits of the twisted
pairs. You should not be hearing anything from that cable.
For a standard 10/100 Base-T Ethernet run in CAT 5 (or CAT 3) cable,
only two of the four pairs are used for signal. One is a differential
pair running to the hub, the other a differential pair running from the
hub. The other two pairs are typically not used, but do provide some
shielding to the run.
I have about 300 feet of surplus CAT 3 (!) cable running through my
house, and it all runs 100 Mb/s with no errors, and no interference.
It's all installed and wired correctly, and I'm proud to say I did it
myself.
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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