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the token bus combines the one-user-at-a time of a bus with the potential-token-loss of a ring.

IEEE 802.4 token bus standard was withdrawn

polled buses with a master are pretty common when you don't mind the performance hit and central-point-of-failure. i believe cable networks work this way.

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Interesting, I'd never heard of token-bus networks, or IEEE 802.4, which was indeed a token-bus standard.

CAN isn't a polled bus, doesn't have a master, and doesn't impose a performance hit. However, on a bus network, every device on the bus is a single point of failure: if it starts jabbering, the network stops working.

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