I want to buy a Power over Ethernet adapter for my computer. I need to know if this will let me plug a cat5 cable in the adapter and then the other end in my computer and have internet. And I just have a question. Does this take a lot of power? How much on average a month would it cost to use PoE? And can anyone suggest me an adapter that will let me do this with good speeds (if it will let me connect to the internet)? Thanks!