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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