802.5 Token-Ring Networks Differential Manchester Encoding –For a 1 No transition at start of bit period Transition in middle –For a 0 Transition at start.

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Presentation transcript:

802.5 Token-Ring Networks Differential Manchester Encoding –For a 1 No transition at start of bit period Transition in middle –For a 0 Transition at start of bit period Transition in middle

802.5 Token-Ring Networks Differential Manchester Encoding –For a J No transmission at start of bit period No transition in middle –For a K Transition at start of bit period No transition in middle

802.5 Token-Ring Networks Differential Manchester Encoding No Transition at Start Transition at Start Transition in Middle 10 No Transition in Middle JK

Token Frame in Start Frame Delimiter (JK0JK000) [1 octet] Access Control (PPPTMRRR) (T=1 for token frame) [1 octet] End Frame Delimiter (JK1JK1IE) [1 octet] PPP gives the priority of the token T=1 for a token, 0 for a full frame M is set to 0 by the sending station, to 1 by the monitor station; if the bit is not changed, there has been a problem, i.e. transmitting stationd didn’t remove frame after a complete run

Token Frame in Start Frame Delimiter (JK0JK000) [1 octet] Access Control (PPPTMRRR) (T=1 for token frame) [1 octet] End Frame Delimiter (JK1JK1IE) [1 octet] In the End Frame Delimiter … I=1 in a single frame or the last frame of the series; otherwise set to 0 E=0 initially; Set to 1 by any station detecting an error

Full Frame Start Frame Delimiter (JK0JK000) [1 octet] Access Control (PPPTMRRR) (T=0 for full frame) [1 octet] Frame Control (FFZZZZZZ) Type of Frame [1 octet] FF tells type of frame 01 if contains LLC Frame (data) 00 for supervisory frames ZZZZZZ tells specific type of frame

Full Frame Start Frame Delimiter (JK0JK000) [1 octet] Access Control (PPPTMRRR) (T=0 for full frame) [1 octet] Frame Control (FFZZZZZZ) Type of Frame [1 octet] Addresses are the same as in bits long Destination Address [6 octets] Source Address [6 octets]

Full Frame Earlier Fields Information field can be up to 17,997 octets for 16 Mbps Token Ring Networks Frame Check Sequence identical to FCS field Routing Information for Source Route Bridges [2-6 octets] Information Frame Check Sequence [4 octets]

802.5 Full Frame Earlier Fields End Frame Delimiter as in Token Frame Frame Status for Reporting Specific Errors A(ddress): If receiving station recognizes its address, changes from 0 to 1 C(opy): if receiving station copies the frame successfully, changes 0 to 1 End Frame Delimiter (JK1JK1IE) [1 octet] Frame Status (ACrrACrr)

Error Handling in Lost Token –There is an active monitor station that checks for problems –If active monitor does not correct the problem, another station assumes the role of active monitor –Complex; Adds to cost

Error Handling in Repairing Breaks in the Ring –A single break makes the ring useless –Really a dual ring; Normally, only one used

Error Handling in If there is a break, the ring is wrapped –Still forms a closed loop –Can only be done once, so breaks should be fixed promptly Break Wrapped Ring Access Unit