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Hi,
Power over ethernet or PoE (IEEE 802.3af) is meant for PoE certified devices. Commonly, VoIP phones and access points are run from PoE capable switches. I use them at work extensively.
if you don't have poe switches, you can also use power injectors between a normal switch and cable.
The switch checks the end device before granting power using a multistage handshake.
what exactly are you running at the ends of the ethernet cables?
you'd just need to make sure that devices are PoE certified before expecting them to work with a PoE switch.
in theory, if you had all usb converted to ethernet, you could have an 8 port gigabit switch at the scope end, one cat 6 cable and a gig switch or your laptop at the other end.
so there would be one power lead and one network lead. so you'd end up with only two cables in all.
have you considered USB over WiFi? its a pretty popular solution and would save a lot of wires.
crosstalk margins on cat6 cables are sufficient to tolerate single 230v single phase power leads running close. although not recommended, if they are kept a few inches apart they will work.
those USB to ethernet devices are interesting, but doesnt detail whether it converts usb signals to ethernet frames with proper mac addresses to use them on an ethernet switch. if it does, then thats very good as each usb device would have a unique mac address.
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