I need to add a wireless AP to the upstairs in our home and am planning on repurposing the existing cat 5 cable that is pulled to all of our phone jacks. My problem is that at the punch board in the basement none of the cables are labeled. I don't want to have to pull each one off in succession to find the correct cable. Is there an easier way to do this--such as some device that can probe the cable at each end? I am not opposed to spending a few dollars on a device if something like this exists.