All I can remember was that some critical systems still used an industry variant of token ring, because it provides hard promises for bandwidth and latency, aki

All I can remember was that some critical systems still used an industry variant of token ring, because it provides hard promises for bandwidth and latency, akin to what an RTOS provides in regards to a guaranteed time slice. It was funny, in my networking class we were told there were two things we'd likely never encounter: Static routing tables and token ring. I recall there was some controversy about having the low security stuff on the same network as anything else at all. The FAA freaked the heck out and made Boeing go to the umpteenth degree to make it super secure. I really should remember more given that my resume had a line item on it of "Helped prepare 787 Avionics security training material"!