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10BaseF and FOIRL
Fiber 10BaseF/FOIRL for long inter-repeater links (too expensive for anything else). Up to 2Km long, station to station (1Km for FOIRL)
Ever seen a common-mode ground induced fire?
Don't ground things together that are fed from different power transformers
Notes:
From http://www.faqs.org/faqs/LANs/ethernet-faq and http://www.ethermanage.com/ethernet/enet-faqs/ethernet-faq.html
10BaseF, and its predecessor, FOIRL, are the only recommended topologies for inter-building links. However, they need not be limited to this role. 10BaseF can also be run to the desktop, though the cost is prohibitively high in all but the most specialized environments (generally, extremely noisy manufacturing facilities, or very security-conscious installations). More commonly, FOIRL (and now, 10BaseF) is used inside buildings to form backbone networks and to connect wiring closets together.