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2_4. CN Token Ring

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2_4. CN Token Ring Powered By Docstoc
					IEEE-802.5
Token Ring
Token Passing
Token Passing
Token Passing
Token Passing
Layers
Physical Ring Architecture and interfaces
Four Stations are connected via a wire center
Data Frames
SD Field
AC Field
FC Field
ED Field
FS Field
Token Frame
Abort Frame
Token Ring
Token Ring Switch
MAU
Combining MAUs
AC Field
Procedure for
    Data
 Frame Sent
     by
  Another
   Station
Procedure
    for
   Data
  Frame
Originated
    by
the Station
Procedure
  for an
 Arriving
  Token
Raising the Current Priority Level
  Lowering
 the Current
Priority Level
Sending a Frame
Example of Priority Mechanism
Comparison of 802.3, 802.4 and 802.5
802.3
Most widely used type
Analog components with collision detection circuitry
Non Deterministic (No priority mechanism)
Cable length is limited
802.4
Highly reliable
More Deterministic
Support Priority mechanism
Extremely complex protocol
Throughput and efficiency is high at high load
802.5
Point to point connection
Twisted pair cable is used
Priority and reservation mechanism
Major minus is presence of centralized monitor
Throughput and efficiency is high at high load

				
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posted:11/29/2011
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