Token passing
A type of CAM.
Token passing uses a token, or series of bits,
to grant a device permission to transmit over the network.
Whichever device has the token can put data into the network. When its
transmission is complete, the device passes the token along to the next device
in the topology. System rules in the protocol
specifications mandate how long a device may keep the token, how long it can
transmit for and how to generate a new token if there isn't one circulating.
Also see contention and polling.
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