The MAU's speed cannot be changed, so I am guessing this is controlled between the token ring cards and the router, (they have to negotiate together). The 15 second blinking of the port light on the MAU is only when one PC is attached. I used this as an indicator to prove that the ports were working properly. When both PC's are connected to the MAU, the lights stay on because there is at least two devices that have created the ring.
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