I've recently purchased a house with several cat5 cables running through the attic. I'm trying to hook one of them up to an access point on the ceiling that is positioned in a place that is about mid-cable. How do I identify which cable is which without cutting them in the middle? Is there a tool that can detect a signal in a cable non-destructively?
if you can't figure it out from the markings
use a tone genrator.
circulate an AC current one way through the cable use a clamp meter
circulate a DC current and use a magenetic compass.
these circulating currents will have to return to the source through some other path (not through the same cable) use a lamp or other load to limit the current.