ATM

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Asynchronous Transfer Mode

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ATM

  1. 1. <ul><li>A </li></ul><ul><li>SEMINAR REPORT ON </li></ul><ul><li>ASYNCHRONOUS TRANSFER MODE(ATM) </li></ul><ul><li>Presented By: </li></ul><ul><li>IQxplorer </li></ul>
  2. 2. INTRODUCTION <ul><ul><li>High performance, cell-oriented switching and multiplexing technology </li></ul></ul><ul><ul><li>Utilizes fixed-length packets to carry different types of traffic </li></ul></ul><ul><ul><li>Helps in efficient multimedia applications, high-speed LAN connections and used in broad range of networking devices </li></ul></ul>
  3. 3. OVERVIEW
  4. 4. BENEFITS OF ATM <ul><li>high performance via hardware switching </li></ul><ul><li>dynamic bandwidth for bursty traffic </li></ul><ul><li>class-of-service support for multimedia </li></ul><ul><li>scalability in speed and network size </li></ul><ul><li>common LAN/WAN architecture </li></ul><ul><li>opportunities for simplification via VC architecture </li></ul><ul><li>international standards compliance </li></ul>
  5. 5. ATM CELL HEADER FORMAT
  6. 6. ATM REFERENCE MODEL
  7. 7. ATM ADDRESS FORMAT
  8. 8. ATM SERVICE CLASSES <ul><li>constant bit rate (CBR) </li></ul><ul><li>variable bit rate–non-real time (VBR–NRT) </li></ul><ul><li>variable bit rate–real time (VBR–RT) </li></ul><ul><li>available bit rate (ABR) </li></ul><ul><li>unspecified bit rate (UBR) </li></ul>
  9. 9. ATM TECHNICAL PARAMETERS <ul><li>cell loss ratio (CLR) </li></ul><ul><li>cell transfer delay (CTD) </li></ul><ul><li>cell delay variation (CDV) </li></ul><ul><li>peak cell rate (PCR) </li></ul><ul><li>burst tolerance (BT) </li></ul><ul><li>sustained cell rate (SCR) </li></ul>
  10. 10. ATM STANDARDS <ul><li>A cohesive set of specifications that provide a stable ATM framework. </li></ul><ul><li>Provide the end-to-end service definitions </li></ul><ul><li>An important ATM standard is interworking between ATM and frame relay </li></ul><ul><li>Two ATM networking standards </li></ul><ul><li>1)broadband intercarrier interface (B–ICI) 2)public network-to-network interface (P–NNI) </li></ul>
  11. 11. DATA INSERTION SCHEMES <ul><li>RFC1483-specifies how interrouter traffic is encapsulated into ATM </li></ul><ul><li>LANEMPOA- support dynamic use of ATM SVCs </li></ul><ul><li>voice and video adaptation schemes-for efficient traffic that no natural breaks, such as a circuit carrying bits at a fixed rate </li></ul>
  12. 12. ATM LAN EMULATION(LANE) <ul><li>LANE components </li></ul><ul><li>1)LANE clients </li></ul><ul><li>2)LANE servers </li></ul>
  13. 13. VIDEO OVER ATM <ul><li>Handled by VBR–RT VCs using AAL–5 for MPEG2 on ATM for video-on-demand applications </li></ul><ul><li>MPEG2 coding can result in two modes: </li></ul><ul><li>program streams—variable-length packets carrying single or multiple programs </li></ul><ul><li>transport streams—188-byte packets that contain multiple programs </li></ul><ul><li>Time stamps are inserted into MPEG2 packets during the encoding and multiplexing process to make better use of networking resources. </li></ul>
  14. 14. VOICE OVER ATM <ul><li>VBR–RT connections is used over ATM which uses silence period. </li></ul><ul><li>Various dynamic compression techniques are used to free bandwidth and alleviate congestion </li></ul><ul><li>A further enhancement is to support voice switching over SVCs which interprets PBX (private branch exchange) signaling and routing voice calls to the appropriate destination PBX </li></ul>
  15. 15. NETWORK TRAFFIC MANAGEMENT <ul><li>objectives :To deliver quality-of-service (QoS) for multimedia applications and provide overall optimization of network resources . </li></ul><ul><li>categorized into three distinct elements </li></ul><ul><li>nodal-level controls that operate in real time </li></ul><ul><li>network-level controls operate in near real time </li></ul><ul><li>network engineering capabilities operating in non real time </li></ul>
  16. 16. ATM APPLICATIONS
  17. 17. ATM AND IP INTERWORKING <ul><li>ATM and IP offer: Scalability, traffic engineering, service differentiation, high availability, value-added applications such as Virtual Private Networks (VPNs) </li></ul><ul><li>Some specifications of ATM and IP </li></ul><ul><li>Multi-Protocol over ATM (MPOA) as addition to LAN Emulation (LANE) </li></ul><ul><li>Additions to ATM's superior routing protocol PNNI </li></ul><ul><li>adoption of Frame-based ATM over Sonet/SDH (FAST) </li></ul>
  18. 18. CONCLUSION <ul><li>ATM technology is the only technology that can guarantee a certain and predefined quality of service. </li></ul><ul><li>The growth of the Internet, need for broadband access and e-commerce are spurring the need for a reliable, flexible, scalable, predictable, versatile transport system and that is given by ATM Technology. </li></ul><ul><li>For voice, video, data and images together, the next generation network depends on ATM. </li></ul>
  19. 19. THANK YOU

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