The token ring topology is frequently found in IBM token ring networks. The concept is to create a data-carrying token (not unlike a ferry boat).
Instead of a central hub as found in the star network, a MAU (Media Access Unit) is the center point. Inside the MAU is a logical ring.
The ring network delimits the requirement of a wiring closet. Should a token get stuck or a PC malfunctions, the MAU disconnects that PC from the network so that the rest of the network is unaffected.
Token ring networks operated at either 4mbit/sec or 16mbit/sec. Putting one 4mbit/sec token ring PC on a 16mbit/sec network will function only if the 4mbit/sec PC is turned on first. Then the network will operate at 4mbit/sec. In all other logistical cases, the network will cease to function.
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