As the title says, I am wondering if there is a way/technology for us to be able to read the data passing through a cable without actually having to be connected to the cable? I know that coaxial cables have shields to shield it from interference right, so I'm guessing my question wouldn't apply, but how about for ethernet cables?
Maybe looking into Induction to transfer data might be good idea, but the current running through ethernet cables is really low, and I'm not sure that you would have a way to 'read' the data. That's the reason why we have wireless transmitters in the first place for non contact communication in the first place.
What were you trying to achieve in the first place?