My first job was looking after a twinax network which ran on Novell 3.12 and a OS/2 server with Notes 3. Most days were spent walking around the site working out who had kicked out their network cable.
ARCnet on coax here, and it was as if I was managing a pirate radio station where everyone could get their hands on the antenna jack and cause reflection. In the end we resorted to superglueing the coax terminators - we'd already switched to soldering our own because pre-fab 50 ohm terminators were stupidly overpriced.
I may still have some sculptures somewhere, entirely composed of coax T-pieces :)