Cyril, I'm not quite sure I follow (I'm not an electrical person, my only knowledge is based from what we learn in Cisco certification), but does that mean that the ground potential isn't an issue because of the cabling requirements for 802.3?
Hi, yes the ethernet standard calls and uses transformers as isolation, specifically to avoid ground loops, if you open any switch or NIC you will find a small black epoxied box that contains this coupling tranformer.
munkieboy I agree, wireless is probably the go, ubnt is a very cost effective 5GHz option.
Cyril