Asynchronous Transfer Mode Instructor Mr. Roy Jolly. By Devender Kasturi

University of North Texas Overview Introduction Why ATM? ATM Implementation example. Business & Profits ATM Switch Conclusions Questions and Suggestions 11/11/2018 University of North Texas

University of North Texas Introduction ATM – Asynchronous Transfer Mode Past Situation Emerged in 1990s but could not take off immediately because of cost of implementation High cost mainly due to lack of technology to make fast ATM switches Inability of organizations to use high bandwidth provided by ATM 11/11/2018 University of North Texas

University of North Texas Introduction Present situation Emergence of VLSI Technology to make fast transistor switching possible. Increase in demand for fast networks. Lowering of prices for ATM switches and Interface cards. 11/11/2018 University of North Texas

University of North Texas What is ATM? A packet switching network. Connection oriented network. Simple concept Data is broken down into cells ATM frame consists of 53 such cells 5 cells are used as header Remaining 48 cells are the payload 11/11/2018 University of North Texas

What is ATM? contd… ATM Frame 5 bytes of header Flow Control Virtual Path Identifier Virtual Circuit Identifier Payload Type Header Error Control (HEC) Cell Loss priority Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 11/11/2018 University of North Texas

University of North Texas ATM AAL’s Traffic Class Class A Class B Class C Class D Adaptation Layer AAL-1 AAL-2 AAL-3/4 AAL-5 (SEAL) Mode Connection Oriented Connectionless End-to-End Timing? Yes No Bit Rate Constant Variable Examples PCM voice, constant bit-rate video Variable bit-rate voice and video Frame relay, SNA, TCP-IP, E-mail SMDS 11/11/2018 University of North Texas

University of North Texas Physical Layers Largely ‘physical layer’ independent E1, E3, DS3, OC3, OC12, etc Megabits rather than kilobits 11/11/2018 University of North Texas

University of North Texas Why ATM? Incorporates variety of information Voice, video, data, multimedia Applications in the field of: Business Manufacturing Health Care Government Software Legal 11/11/2018 University of North Texas

University of North Texas Why ATM? Lowers network costs because of a common network. Higher Bandwidth Flexible Bandwidth QOS Standardization of equipment 11/11/2018 University of North Texas

Implementation Example Sprint ATM Network Consists of ATM network with a range of ATM switches and an Integrated Services HUB. 11/11/2018 University of North Texas

University of North Texas DCS Defense Communication System POP point of presense 11/11/2018 University of North Texas

ATM Network ISH Sprint ATM Network Structure 11/11/2018 University of North Texas

Integrated Services Hub Aggregates networks and provide multi service access concentration. Examples Cisco 1720 Cisco 2600 - NxT1 Cisco 3600 - NxT1 Cisco 3810 Nortel Passport 6420 Nortel Passport 6440 Nortel Passport 6480 The Integrated Services Hub is the data equipment that aggregate the networks and provide multi service access concentration for frame relay or ATM services. Sprint tailors network consolidation to meet the needs of the business applications. The integrated services hubs we use to provide Sprint Network Consolidation are: Cisco 1720 - One port and two slots for small branch offices Cisco 2600 - NxT1, one to three ports for small to medium businesses Cisco 3600 - NxT1, multiple (more than three) ports for medium businesses Cisco 3810 - One T1 port for small branch offices Nortel Passport 6420 - three slots for small branch offices Nortel Passport 6440 - five slots for medium size locations Nortel Passport 6480 - 16 slots for large corporate locations 11/11/2018 University of North Texas

University of North Texas Integrated Services Hub (ISH) LAN Dedicated IP Video PBX systems Managed Network Service Fax Voice Workstation 11/11/2018 University of North Texas

Another Example… ATM Backbone Network of British Airways 11/11/2018 University of North Texas

University of North Texas ATM Growth Results for backbone technologies adopted obtained from studies by Infonetics Research. IP and ATM are prevalent networks MPLS Growing Fast Suggests Multi-service networks. Infonetics Research is an international market research and consulting firm covering the data networking and telecommunications industries in North America, Europe, and Asia. We provide objective analysis of end-users, service providers, and product manufacturers through in-depth research studies, quarterly market share and forecast services, and consulting and custom research services. 11/11/2018 University of North Texas

University of North Texas ATM QOS Results obtained from Infonetics Research. ATM dominant. MPLS growing fast. MPL :- Multiprotocol Label Switching 11/11/2018 University of North Texas

University of North Texas Sprint Business Sprint ATM service has been voted #1 in QOS. Many organizations small or large are adopting this service. Because of this a lot of profits are being reaped by Sprint. 11/11/2018 University of North Texas

Cisco BPX 8600 Series Switches Standards-based ATM switch with advanced IP and ATM capabilities. Designed to meet the demanding, high-traffic needs Delivers high-performance ATM switching, multi-service adaptation and aggregation 11/11/2018 University of North Texas

Cisco BPX 8600 Series Switches Up to 20 Gbps of high-throughput switching Supports a wide range of interfaces, from Frame Relay to full broadband subscriber interfaces Also supports multi-protocol label switching (MPLS) 11/11/2018 University of North Texas

Cisco BPX 8600 Series Switches Multi-shelf architecture Allows users to incrementally expand the capacity of the system as needed and fully utilize the switch fabric Advanced switching capabilities Intelligent call processing for Frame Relay and ATM switched virtual circuits (SVCs) 11/11/2018 University of North Texas

Cisco BPX 8600 Series Switches Reliability Automatic Routing Management reroutes virtual circuits if a trunk fails Scalability High service availability and performance Robust, redundant architecture 11/11/2018 University of North Texas

University of North Texas Conclusions ATM network supports constant bit rate and variable bit rate applications. Organizations are able to run different applications using a common network. Lower cost of implementation because of a single network. 11/11/2018 University of North Texas

University of North Texas Conclusions ATM provides good QOS. Organizations using ATM networks are earning profits. ATM is a network for the future. Compatible for implementing MPLS. 11/11/2018 University of North Texas

University of North Texas References http://www.sprintbiz.com/bizpark/products_services/network http://www.cisco.com/univercd/cc/td/doc/pcat/bp8600.htm#ov http://telephonyonline.com/ar/telecom_tough_crowd_sprint/ http://news.earthweb.com/xSP/print.php/574431 11/11/2018 University of North Texas