|Power over Ethernet should be no problem with Audrey. POE relies on pins 4,5,7,8 since ethernet doesn't use those pins. The problem might be that Audrey requires 3.3 and 5 volts, meaning that you'd have to send 3 volts down one pin and 5 down another. Normally, POE do-it-yourselfer's (and real manufacturers for that matter) wire 4-5 together as a pair (as either + or -) and 7-8 as the opposite polarity pair. This parallel wiring gives less voltage drop over a given distance (which is often needed if wiring longer runs). I'd suspect that as long as your run of cat5 is less than 100 ft or so, you can probably pull it off.|
Otherwise, you can use a different power supply than the one provided, and convert to 3.3 and 5 volts on the Audrey side of the connection. This would enable longer runs, but would require a bit more electrical expertise, of course.
Try this link for more ideas/information: