You can DNC up 100 ft with no issue IF you have no noises being injected into the cable. Can you transfer files to and from the machine from the new location? If you can than either you have a low signal voltage (doubtful) or the routing of you cable is causing signal distortion. Keep away from ANY source of RF, I.E. flouresent lights, EDM, high power lines, enen those inside the walls.

Neal