8228 MAUs are made up of micro-switches that get charged (initially) by a 9
volt battery and later kept working from the power of the ring. If it's
real old, you may need to recharge it. Never charge a port that is already
in the ring - you'll beacon it. Also, you don't need to change RI/RO.
When a station "inserts" into the ring, it sends a voltage which flips open
this switch. The current from the card pasing the token keeps it open.
When the workstation shuts down or it is unplugged, this switch will close,
bypassing the port, and the ring keeps going.
To expand your token ring network, you put a cable from the RO port to the
RI of another MAU. You should then connect that second MAUs RO to the RI of
the original MAU. This keeps the ring from wraping. What's nice though is
that you can break the ring to insert an 8228 at any time, as long as the
ring isn't already wrapped, and not impact anyone.
It's a fairly simple device. One of my favorite.
Mike
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