Sounds like a horrible idea to me, but I'm not an Electrical Engineer, so don't put any weight on that opinion. The basic idea is that there are unused pairs in Cat 5 that can be put to use carrying current. Of course you can't push a lot of current, but computer devices are becoming more and more low power and there are even POE capable computers
Well, it sounds scary to me. Just because wires are unused by IP doesn't mean that some piece of equipment took pains to avoid them. The unused pairs could be carelessly connected where they shouldn't be, not causing immediate damage, but the the introduction of power there might cause general weirdness or worse - but again, what do I know?
Here's somebody's HOWTO if you are curious and more brave than I.
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More Articles by Tony Lawrence © 2011-04-08 Tony Lawrence
Today, kernels are too much obedient servants, blindly doing the bidding of any program that asks. (Tony Lawrence)