asynchronous transfer mode (atm)

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A detailed presentation about asynchronous transfer mode (atm)

A detailed presentation about asynchronous transfer mode (atm)

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  • 1. Asynchronous Transfer Mode (ATM)
  • 2. By. P. Victer Paul Dear, We planned to share our eBooks and project/seminar contents for free to all needed friends like u.. To get to know about more free computerscience ebooks and technology advancements in computer science. Please visit.... http://free-computerscience-ebooks.blogspot.com/ http://recent-computer-technology.blogspot.com/ http://computertechnologiesebooks.blogspot.com/ Please to keep provide many eBooks and technology news for FREE. Encourage us by Clicking on the advertisement in these Blog.
  • 3. Agenda
    • Definition
    • Basic characteristics
    • Why asynchronous
    • How to access the network
    • Service Categories
    • Connections
    • Protocol Architecture
    • pros & cons
    • Troubleshooting
  • 4. ATM – definition
    • "A transfer mode in which information is organized into cells; it is asynchronous in the sense that the recurrence of cells containing information from an individual user is not necessarily periodic".
  • 5. ATM Characteristics
    • ATM uses packet switching with fixed length packet of 53 bytes – CELLs. Each cell has a 5-byte header and 48-byte payload
    • ATM uses Virtual Circuits
    • ATM can run over any physical layer. Often runs over fiber optics using the SONET standard at speeds of 155.52 Mbps, 622 Mbps and higher
  • 6. ATM Characteristics
    • A Cell network uses the cell as the basic unit of data exchange. A cell is defined as a small, fixed-sized block of information
    • ATM uses asynchronous TDM – to multiplex cells coming from different channels
    • Uses fixed slots (size of cells)
    • Fills a slot with a cell from any input channel that has a cell
    • – slot is empty if none of the channels has a cell to send
  • 7. Asynchronous Transfer Mode (ATM) MUX Wasted bandwidth 4 3 2 1 4 3 2 1 4 3 2 1
  • 8. ATM Access
    • ATM is a cell-switched network.
    • The user access devices, called the endpoints, are connected through a user-to-network interface (UNI) to the switches inside the network.
    • The switches are connected through network-to-network interfaces (NNIs).
  • 9. STDUCTURE X X X X X X X X X Private UNI Public UNI NNI Private NNI Private ATM network Public UNI B-ICI Public UNI Public ATM network A Public ATM network B
  • 10. ATM Connections
    • two levels of ATM connections:
    • virtual path connections
    • virtual channel connections
    • indicated by two fields in the cell header:
    • virtual path identifier VPI
    • virtual channel identifier VCI
  • 11. Physical Link Virtual Paths Virtual Channels
  • 12.  
  • 13. ATM Service Categories
    • Real-time services
      • Constant bit rate – uncompressed audio/video info
        • Videoconferencing, TV, pay-per-view, VOD, etc.
      • rt-Variable bit rate
    • Non-real-time services
      • nrt-VBR – high end system QoS, critical response time
        • Bank transactions, airline reservations, etc.
      • Unspecified bit rate – best-effort service
        • e.g. text/image messaging, telecommuting
      • Available bit rate – bursty apps requiring reliable end-to-end connection
        • e.g. LAN, router-to-router reliability
  • 14. ATM Protocol Architecture Plane management Management plane Control plane User plane Physical layer ATM layer ATM adaptation layer Higher layers Higher layers Layer management
  • 15.
    • adaptation layer: only at edge of ATM network
      • data segmentation/reassembly
      • roughly analogous to Internet transport layer
    • ATM layer: “network” layer
      • cell switching, routing
    • physical layer
    Physical layer ATM layer AAL user
  • 16. Pros & cons
    • higher transmission speeds
    • quality of service
    • bandwidth-on-demand
    • application-independent
    • Cost
    • Complexity
    • Availability
  • 17. Troubleshooting
    • Performing Basic Interface Checks
    • Determining Network Connectivity
    • Performing Loopback Tests
    • Troubleshooting 155-Mbps and 622-Mbps Interfaces
    • Troubleshooting T1 and E1 Interfaces
    • Troubleshooting DS3 and E3 Interfaces
    • Troubleshooting CBR T1 and CBR E1 Interfaces
    • Troubleshooting 25-Mbps Interfaces
  • 18. References:
    • Asynchronous Transfer Mode (ATM) fundamentals, white paper from Internation Engineering Consortium
    • ATM tutorial-fnc educational services
    • Higher Layer Protocols:TCP/IP and ATM- Eytan Modiano,Massachusetts Institute of Technology
    • ATM Switch Troubleshooting Guide-Cisco