one of my favorite tricks is to wire up the RJ45 with the blue and brown pairs...I leave them hanging out...Then, I grab the power supply for whatever device I'm powering, chop it in the middle, strip the wires, and splice them onto the blue (for positive) and brown (for negative) to send passive POE down the cable... Works pretty good...only had one problem with a lack of volts/amps at the powered device....It's a nice alternative to true POE and cuts down on extension cords, and ugly wires hanging around the cameras......... IF anyone wants to know more about this trick, a simple google search will work to provide sufficient information... OR, just find out the size of your power jack and buy a passive POE splitter for (usually) less than $5.
(reposting this in a new thread for anyone else who may benefit from it)...