[TriLUG] OT: Home Depot and Cat 5

[Rob Lockhart]

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Joseph Mack wrote:

| Brian Henning wrote:
|
|> As I understand it, 10-base-T needs 4 conductors (two signal, two
|> ground) and 100-base-T requires all 8 (four signal, four ground).
|>
|
|
| only 4 are used. I don't know why everyone has the 8 conductors.
| You would think that everyone would have dropped the extra 4 by
| now. People doing power over ethernet (poe) - eg for WAPs at the
| end of a long run of ethernet, where there's no 120V, send it over
|  one of the unused pair.
|
| Joe
|
I thought that POE used both unused pairs, tying one pair to +VCC and
the other one to ground (VSS)?
~  -Rob

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