Evil stuff. Once was popular as the ethernet backbone in a building. You'd connect to it using special tranceivers called thicknet taps. From there, you'd run an AUI cable down to either a repeater, for 10base-T, or to a media converter, which would allow you to attach a thinnet which would go around the room. Largely obsolete, but a lot of 10base5 is still installed in buildings across the world.

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