I've seen a telephone (copper pair) optoisolator which had a short piece of fiberoptic cable inside. Each circuit on both sides of the cable had their own highly isolated power supplies. This was the only thing that worked in the Amazon region to stop phone equipment from getting wiped out during the intense electrical storms. The beauty of this device was it didn't require a first class ground system to work, in fact it didn't require any ground. A ground would just present up a difference in potential between the phone line and ground and encourage destruction. The telco side of this thing would just float at what ever potential the telco's lines were presenting and the on site equipment on the other side of this thing never saw that potential. Has anyone seen such a thing for Ethernet?
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