I remember we played warcraft 2 over ~15m of cat3 cable stretched outside between two flats on 6th floor. Those were the times, lol.
For every standalone building that has a ground, that building also has an electrical potential. This potential is not necessarily the same between two neighboring buildings. When you stretch a copper line between them, you are tempting fate, electrically, not to mention the dangers of lightning strikes and the elements attacking that connection.
It is generally recognized that fiber optics are not only very efficient and durable, but also impervious to electrical troubles of the type that may plague inter-building connections. Simply grab switches or routers that support at least one fiber-optic connection, and link up!
Besides you worry too much. Entire cities were wired with cat5 hanged off steel cable between 9 to 15 story buildings in early 2000s, before fiber. Nothing burned down.
Unshielded cable is theoretically isolated at both ends but who actually knows with some chinesium equipment?
Because of this they were an early adopter of fiber-based networking. I remember being wowed by ATM over fiber running between closets at a blazing 155Mbps (with tons of 10BASE-T clients connected to FORE chassis switches).
+1 for fiber though. Long fibers are cheaper, SFP connectors and modules are commonplace and have become quite cheap. Just need to learn a few new things, such as simplex/BiDi vs duplex fiber, and multimode vs mono mode.
Not Warcraft though - some ancient DOS game.
It would still works today if both parties have a landline.
Two letters can have more than one meaning!
But "Ethernet/IP" is not just "two letters", is a trademarked brand.
https://www.odva.org/technology-standards/key-technologies/e...