Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 1 A SEMINAR REPORT ON ASYNCHRONOUS TRANSFER MODE(ATM) Under the Guidance of Mr R.K.Shial By Sangram Sekhar Choudhuri CS

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 2 INTRODUCTION High performance, cell-oriented switching and multiplexing technology Utilizes fixed-length packets to carry different types of traffic Helps in efficient multimedia applications, high-speed LAN connections and used in broad range of networking devices

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 3 OVERVIEW

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 4 BENEFITS OF ATM high performance via hardware switching dynamic bandwidth for bursty traffic class-of-service support for multimedia scalability in speed and network size common LAN/WAN architecture opportunities for simplification via VC architecture international standards compliance

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 5 ATM CELL HEADER FORMAT

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 6 ATM REFERENCE MODEL

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 7 ATM ADDRESS FORMAT

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 8 ATM SERVICE CLASSES constant bit rate (CBR) variable bit rate–non-real time (VBR–NRT) variable bit rate–real time (VBR–RT) available bit rate (ABR) unspecified bit rate (UBR)

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 9 ATM TECHNICAL PARAMETERS cell loss ratio (CLR) cell transfer delay (CTD) cell delay variation (CDV) peak cell rate (PCR) burst tolerance (BT) sustained cell rate (SCR)

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 10 ATM STANDARDS A cohesive set of specifications that provide a stable ATM framework. Provide the end-to-end service definitions An important ATM standard is interworking between ATM and frame relay Two ATM networking standards 1)broadband intercarrier interface (B–ICI) 2)public network-to-network interface (P–NNI)

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 11 DATA INSERTION SCHEMES RFC1483-specifies how interrouter traffic is encapsulated into ATM LANEMPOA- support dynamic use of ATM SVCs voice and video adaptation schemes-for efficient traffic that no natural breaks, such as a circuit carrying bits at a fixed rate

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 12 ATM LAN EMULATION(LANE) LANE components 1)LANE clients 2)LANE servers

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 13 VIDEO OVER ATM Handled by VBR–RT VCs using AAL–5 for MPEG2 on ATM for video-on-demand applications MPEG2 coding can result in two modes: 1.program streams—variable-length packets carrying single or multiple programs 2.transport streams—188-byte packets that contain multiple programs Time stamps are inserted into MPEG2 packets during the encoding and multiplexing process to make better use of networking resources.

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 14 VOICE OVER ATM VBR–RT connections is used over ATM which uses silence period. Various dynamic compression techniques are used to free bandwidth and alleviate congestion 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

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 15 NETWORK TRAFFIC MANAGEMENT objectives :To deliver quality-of-service (QoS) for multimedia applications and provide overall optimization of network resources. categorized into three distinct elements 1.nodal-level controls that operate in real time 2.network-level controls operate in near real time 3.network engineering capabilities operating in non real time

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 16 ATM APPLICATIONS

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 17 ATM AND IP INTERWORKING ATM and IP offer: Scalability, traffic engineering, service differentiation, high availability, value- added applications such as Virtual Private Networks (VPNs) Some specifications of ATM and IP 1.Multi-Protocol over ATM (MPOA) as addition to LAN Emulation (LANE) 2.Additions to ATM's superior routing protocol PNNI 3.adoption of Frame-based ATM over Sonet/SDH (FAST)

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 18 CONCLUSION ATM technology is the only technology that can guarantee a certain and predefined quality of service. 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. For voice, video, data and images together, the next generation network depends on ATM.

Technical Seminar Presented by :- Sangram Sekhar Choudhuri(CS ) 19