02-Mar-2018, 19:55
(This post was last modified: 02-Mar-2018, 19:56 by Rufus McDufus.)
The ethernet standard over electrical wire operates on the OSI model. The physical layer uses good old-fashioned electricity to do its stuff, in a very complex fashion in order to achieve high speeds. Usually there is some electrical isolation at each NIC. I think the isolation is mandated, though there have been some famous omissions - I seem to recall early Raspberry Pi's didn't have isolated NICs (it was a manufacturing error I seem to recall). but this doesn't isolate for all types of noise, so yes there is opportunity for noise to creep in over wired/copper ethernet. How much, or what effect it has would need to be measured.