Again, it the last leg of the circuit that is the weak link in the chain.

I can only imagine how much noise this has got to be putting on the line. These are not exactly clean signal devices to begin with. Overdriving them and ganging them around can only make ambient that much worse inside the building.

I've seen LANs shut down completely due to spurious noise from digital PBX circuits, intercomms, 2.4 and 5.6 Ghz cordless phones, etc etc etc. The spectrum is just getting trashed out IMHO.