If only 1 camera, you could get away with an injector. The EnGenius will need power as well via an injector. I can't remember, but I think the ENH has a lan port plus the power port, no power will pass to it though. You could have 2 outlets there and use one for the EnGenius and 1 for the camera. Power the ENH from its injector, then run an ethernet cable from the LAN port on the ENH to the camera injector then to the camera. That would be a simple fairly safe way to do it. Not much to go bad from heat or cold. If you add more cams in the future you could add the switch then.