Token Ring and IEEE 802.5 are two of the three principal examples of token-passing network implementations, the third being Fiber Distributed Data Interface (FDDI). Token passing networks move a small frame, called a token, around the network. Possession of the token by a host grants the right to transmit. If a host, or node, receiving the token has no information to send, it passes the token to the next host in the ring. Each host can hold the token for a maximum period of time, called the Token Holding Time (THT), and the default is 10 milliseconds (ms).
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