But if you are under a tight budget I'm unsure how it could save you any money.
I do some volunteer work in our local school....(low budget/not budget) and we're looking at ways to use the existing infrastructure rather than do extensive rewiring. Going fully wireless is not a possibility at this time, however. Two things we need to do are to add a few more ports to classrooms. Currently each room has only one or 2 wired ports. When extra connections are needed, it's necessary to carry a small switch or hub into the room just to add a couple of connections. My thinking is that, with PoE we can just use something like a 3Com Intellijack system where needed but our 3Com baseline switch doesn't have PoE capability and this is pricey hardware if you just need a limited number of powered connections. Another use for PoE would be to add a couple of PoE capable wireless APs for use with a mobile laptop cart. This cart carries about 2 dozen laptops to the various classrooms for specific projects. It has it own AP but must occupy a network jack to work. It's a 2 story school building so we'd need to figure out what it would take to cover the whole building. It would seem that eliminating the need for DC converters and using a lot of AC outlets would be worthwhile. There are PoE "in line" adapters available that we could install in the network cabinet just for the Cat 5 that needed power. I am wondering what the downsides might be to doing such. Is PoE hazardous to network health in any way? TIA