Chapter_11ATM - William Stallings Data and Computer...

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William Stallings Data and Computer Communications Chapter 11 Asynchronous Transfer Mode and Frame Relay
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Protocol Architecture Similarities between ATM and packet switching Transfer of data in discrete chunks Multiple logical connections over single physical  interface In ATM flow on each logical connection is in  fixed sized packets called cells Minimal error and flow control Reduced overhead Data rates (physical layer) 25.6Mbps to  622.08Mbps
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Protocol Architecture (diag)
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Reference Model Planes User plane Provides for user information transfer Control plane Call and connection control Management plane Plane management whole system functions Layer management Resources and parameters in protocol entities
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ATM Logical Connections Virtual channel connections (VCC) Analogous to virtual circuit in X.25 Basic unit of switching Between two end users Variable rate Full duplex Fixed size cells Data, user-network exchange (control) and network- network exchange (network management and routing) Virtual path connection (VPC) Bundle of VCC with same end points
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ATM Connection Relationships
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Advantages of Virtual Paths Addresses the problem of control cost Simplified network architecture Increased network performance and reliability Reduced processing Short connection setup time Enhanced network services
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Simplified Network Architecture transport functions can be separated into those  related to  individual logical connections or  groups of connections
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increased network performance and reliability Network deal with fewer entities Connection time reduction new virtual channels can be set up by executing  simple control functions without processing by  intermediate nodes
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Terminology VC  virtual channel---unidirectional transport of  ATM cells associated by a common unique  identifier VCI virtual channel identifier – unique numerical  tag that identifies a particular VC link for a given  VPC VP virtual path – unidirectional transport of ATM  cell belonging to  virtual channels that are  associated by a common identifier VPI  virtual path identifier – identifies a particular  VP
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Call Establishment Using VPs
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  • Spring '08
  • Simmons
  • Flow control, Asynchronous Transfer Mode, Virtual channel identifier, ATM cells, ATM cell, ATM cells Fragment

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