Is it possible, with an oscilloscope, scalpel and a lot of patient, to open up a network cable (twisted pair), and sniff the traffic? All without interrupting the network traffic.

So;

* Use the scalpel to get inside the cables, one by one.
* Use the oscilloscope to find out which cable does what.
* Attach to the data cables and dump the packages.

Or will this disturb/beak the connection and make it unstable/impossible for the ends to talk to each others.