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A wee bit of junk related to Ringnet, from the web.

From patent 4,528,661

        Guessing this is a discussion of the Primenet ring network as
        implemented by PNC boards.

        1024 bit data packets
        6-14 bit sync packets

        variable length sync packets are used to adjust the bit rate
        around the ring without a master clock

        Modulated NRZI signal

Morten Reistad in c.s.p.:

        Or did someone finally make Ringnet software for an Ethernet
        controller like the LHC500?

        BTW: Ringnet is basically X.25 Layer 3 over a lan, with some
        elementary flow control commands to support it.