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A symmetrical D igital S ubscriber L ine Tutorial Slide Show

This tutorial provides an overview of ADSL technology, its capabilities, and its market status as the leading broadband choice. It covers the architectural options, reach of ADSL, and its applications in internet access, video, voice over IP, and more. The tutorial also discusses the future of ADSL and the advancements in DSL technology.

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A symmetrical D igital S ubscriber L ine Tutorial Slide Show

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  1. AsymmetricalDigital Subscriber Line Tutorial Slide Show

  2. Market Status of ADSL Technology • ADSL is the #1 Broadband Choice in the World with over 60% marketshare • ADSL is now available in every region of the world • ADSL is capable of providing up to 50 Mbp, and supports voice, video and data. • The new DSL network is IP-centric • There is broad equipment interoperability and there are currently established test specifications for ADSL, ADSL2plus, SHDSL, and VDSL • Finally, ADSL and home networking are a natural fit as DSL effectively supports multiple applications for multiple uses via each DSL connection.

  3. Tutorial Outline • What Is ADSL ? • What Can ADSL Do ? • How Does It Work ? • Architectural Options • Status of the Technology • The Future

  4. Simple overview of ADSL in the phone network POTS- Plain Old Telephone Service

  5. ADSL Equipment Standard Telephone Lines Central Office Building ResidentialCustomer ADSL Rackof Line Cards Customer Premises Equipment ADSL Modem or Gateway

  6. Reach of ADSL • Typically ADSL can reach as far as 18 kft from the central office • To extend the reach, service providers have a host of options, outlined in the white paper DSL Anywhere v.2

  7. “Evolution of Digital Access” Pure Fibre Hybrid Fibre/Copper FTTH Enhanced Copper FTTx, VDSL2, ADSL2plus ADSL ISDN VoicebandModem

  8. “Today’s Typical Network” : ADSL Video Servers ADSL Internet Broadband Network 1.5 to 8Mbit/s 9.6 to 640kbit/s Telephone Network Live Broadcast

  9. ADSL Applications • Internet Access & File Sharing • Video • Broadcast TV • Video On Demand • Voice over IP via DSL • Teleworking • Online Education & Shopping • Telemedicine • Online Gaming

  10. How Does DSL Work? • Functional Elements • Use of Bandwidth • Channel Separation & POTS Splitter • New IP-centric Architecture

  11. ADSL Modem Structure Mbit/s Mbit/s ADSL Modem ADSL Modem kbit/s kbit/s Line POTS Filter POTS Filter POTS Linecard Exchange End Customer End

  12. Transmission Convergence Rates/multiplexing Forward Error Control (FEC) Framing/mapping Protocol processing OAM processing Alternatives Bit Synchronous (STM) Packet Mode ATM Mode ADSL Modem Functions Physical Media Dependent Line Code (modulation) Initialisation POTS splitter/interface Scrambler/descrambler Base EOC functions Digital Interface Line Interface Alternatives DMT QAM CAP Baseband

  13. Basic Architecture 10 base T Ethernet 45 or 155 Mbit/s ATM orEthernet ISP Ethernet Hub/Switch CPE or PC ADSL Remote Router ADSL Linecard 10 base T or 100 base T 10 base T Ethernet

  14. IP Architecture QoSBreakthrough! Or IP Transport TR-059 specifies IP Routed Network Architecture to support a mix of IP based services including IP Video from an Application Service Provider, by employing DiffServ.

  15. Today there are variousDSL Technology Options

  16. DSL Forum-Continuous work to enhance DSL

  17. Key Standards Bodies & Recommendations • ANSI • ETSI • ITU • DSL FORUM • DLNA • UPnP

  18. Digital Subscriber Line Introduction Slide ShowThank You for watching!

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