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Asynchronous Transfer Mode (ATM): Basic

Asynchronous Transfer Mode (ATM): Basic. GROUP 13. Group Member. MOHD FARRIZ FAIRUZZAMAN AZME WET020089 MOHD KHAIRI SHAPIEE WET020090 MOHD RASMANIZAN AWANG WET020092

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Asynchronous Transfer Mode (ATM): Basic

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  1. Asynchronous Transfer Mode (ATM): Basic GROUP 13

  2. Group Member • MOHD FARRIZ FAIRUZZAMAN AZME WET020089 • MOHD KHAIRI SHAPIEE WET020090 • MOHD RASMANIZAN AWANG WET020092 • NIK MOHD JEFRY JUHARI WET020106 • NURUL IHSAN BAHARUDIN WET020135

  3. Topics • ATM History • ATM Concepts • ATM Architecture • Summary

  4. History of ATM • Asynchronous Transfer Mode (ATM) is cell relay protocol • Designed by ATM Forum and adopted by the ITU-T and B-ISDN • Allow high-speed interconnection of all the world’s networks • ATM can be thought of as the “highway” of the information superhighway ITU-T : International Telecommunations Union-Telecommunation Standardization Sector B-ISDN: Broadband Integrated Services Digital Network

  5. ATM Technology One International Standard Both LAN and WAN Technology Standards Based Scalable in Distance QoS Carries Multiple Traffic Types Scalable in Speed Voice/Data/Video Mb Gb QoS = Quality of Service A

  6. ATM Basic Concepts • Negotiated Service Connection • End-to-end connections, called virtual circuits • Traffic contract • Switched Based • Dedicated capacity • Cell Based • Small, fixed length A

  7. Negotiated Service Connection Traffic Contract • Parameters • Traffic Characteristics • Peak Cell Rate • SustainableCell Rate • Quality of Service • Delay • Cell Loss Virtual Connection 1-QOS A Virtual Connection 1-QOS B Virtual Connection 1-QOS b

  8. The ATM Cell Header Payload • Small Size • 5 Byte Header • 48 Byte Payload (user information – may be less than 48 bytes) • Fixed Size • Header contains virtual circuit information • Payload can be voice, video or other data types 5 Bytes 48 Bytes 53 Bytes A

  9. ATM System Architecture End Station Switch End Station Voice Voice AAL ATM PHY PHY ATM PHY PHY ATM AAL Data Data Video Video Cells • Adaptation Layer (AAL): Inserts/extracts information into 48 byte payload • ATM Layer: Adds/removes 5 byte header to payload • Physical Layer: Converts to appropriate electrical or optical format

  10. ATM Adaptation Layer • Provides Mapping Of Applications To ATM Service Of The Same Type • Segments/Reassembles Into 48 Payloads • Hands 48 Byte Payloads To ATM Layer AAL Types 1 Circuit Emulation -Constant Bit Rate (CBR) Low Bit Rate Voice (Real Time) -Variable Bit Rate (VBR) Time Invariant Data “Simple” Data 48 Bytes 2 3/4 5 A

  11. ATM Layer 48-Byte Payloads From AAL • Adds/Removes Header To 48 Byte Payload • Header Contains Connection Identifier • Multiplexes 53 Byte Cells Into Virtual Connections • Sequential Delivery Within A Virtual Connection 5-Byte Header } 53-Byte Cell To Physical Layer Header Contains Virtual Path and Channel Identifiers A

  12. Physical Layer Cable Plants Speed Matching and Framing Uses Existing Media Twisted Pair Coax Fiber -Multimode -Single Mode Wide Range of Speeds LAN, MAN, WAN Compatibility Transmission Frame A

  13. Accommodation of mixed media traffic Simplified Network Infrastructure ATM Scalability & Flexibility Advantages of ATM

  14. Simplified Network Infrastructure ATM Switch ATM Switch WAN Campus/MAN ATM Device ATM Device E-net E-net ATM ATM ATM ATM TR TR LAN/Desktop Server Server LAN=MAN=WAN

  15. Accommodation of Mixed Media Video Data Voice

  16. Standards STANDARDS GROUPS Customers - ITU-T, TS (CCITT) - ANSI - ETSI - IETF... ATM Forum 900 Carriers and Service Providers 5 91 92 93 94 95 96 97 Network Equipment Providers Software Developers Semiconductor Vendors

  17. ATM Features • Integration of LAN/MAN/WAN/MAN • Supported By Standard And Industry Forums • Supports Current And Future High-Bandwidth Applications And Protocols • Independent of Physical Interface • Interoperability With Conventional Technology • Increased End-To-End BW • Switch Based, Connection Oriented • Small, Fixed Length Cell A

  18. ATM Benefits • Simplified Networking And Architecture • Better Multivendor Compatibility • Long Architectural Lifetime • Supports Current Cable Plant • Migration Occurs At User’s Pace • Dedicated And Deterministic Bandwidth • One Network For All Traffic • Supports New Applications

  19. Summary • ATM combines a new set of networking features • Connection oriented, based on switch technology and fixed length cell • Uses existing cable plants • Wide range of speed and distance • Designed for LAN/MAN/WAN/MAN applications • Evolution, not revolution, from existing networks and applications • ATM is real and there is wide participation from all market segments B

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