Explain token passing -token ring, Computer Networking

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Token Passing - Token Ring (IEEE 802.5)

Needs that station take turns sending data
Token passing coordinates process
Token is a especially formatted three-byte frame that circulates station wishing to transmit must first have possession
Token passes from NIC to NIC in sequence if station has data to send and station takes token and sends data frame if not passes to neighbour
Every station receives the frame one by one and examines the destination address
If it matches frame is copied station checks the frame for errors changes bits to indicate the frame was received and copied
Packet continues around the ring also is passed back to originating station
Once the sender receives the frame in addition to recognizes its address in the sender field it examines the address-recognized bits
If they are set it recognizes the frame was received and copied
Sender subsequently discards the frame and releases the token back to the ring

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