1. Asymmetric Digital Subscriber Line Tutorial Slide Show

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

3. ADSL Equipment Residential Customer Remote ADSL Unit Customer Premises Equipment Central Office Building ADSL Rack of Line Cards Standard Telephone Lines

4. Data & Telephony on One Line Data as ATM Cells &/or IP Packets TV Fast Internet Anything that can be digitised All in Addition to Existing Analogue Telephony

5. “Evolution of Digital Access” Voiceband Modem ISD N ADSL FTTH FTTx + VDSL Today Enhanced Copper Hybrid Fibre/Copper Pure Fibre

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

7. Typical Network Construction Central Office Street Cabinet Overhead Feed Underground Feed Feeder NetworkDistribution Network

8. Next Topic What Is ADSL ? What Can ADSL Do ? How Does It Work ? Architectural Options Status of the Technology The Future

9. ADSL Applications  Internet Access, etc.  LAN Access (Teleworking)  Distance Learning  Broadcast TV  Home Shopping  Video On Demand

10. Next Topic What Is ADSL ? What Can ADSL Do ? How Does It Work ? Architectural Options Status of the Technology The Future

11. How Does ADSL Work? Functional Elements Use of Bandwidth Channel Separation & POTS Splitter Transmission Methods  Discrete Multi-tone Modulation (DMT)  Quadrate Amplitude Modulation (QAM)  Carrierless Amplitude/phase Modulation (CAP)

12. ADSL Modem POTS Filter Mbit/s kbit/s ADSL Modem POTS Filter POTS Linecard Mbit/s kbit/s Line Exchange EndCustomer End ADSL Modem Structure

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

14. ADSL HDSL ISDN VDSL Growth in Bandwidth Utilization Bandwidth (MHz) Time 10+ MHz ~1 MHz~0.5 MHz~0.1 MHz ~1986 ~1990 ~1994 ~1997/8?

15. Next Topic What Is ADSL ? What Can ADSL Do ? How Does It Work ? Architectural Options Status of the Technology The Future

16. Data-Centric Architecture CPE or PC ISP ADSL Linecard Router Ethernet Hub/Switch 10 base T Ethernet 10 base T Ethernet 10 base T or 100 base T 45 or 155 Mbit/s ATM or FR ADSL Remote

17. Telecom-Centric Architecture CPE e.g. PC or STB ADSL Access Mux ADSL Linecard ISP ATM 155 Mbit/s fibre ATM e.g. 25 Mbit/s ADSL Remote

18. Next Topic What Is ADSL ? What Can ADSL Do ? How Does It Work ? Architectural Options Status of the Technology The Future

19. Status of ADSL Technology Equipment Standards Trials

20. ADSL Equipment Trends More Choice of Transceiver Chips and Equipment Increased Transceiver Integration More Transceivers Per Line Card and Equipment Rack More Customers Per Exchange Transceiver Faster Transmission Speeds Increased Embedded Internetworking Functionality

21. Standards and Recommendations  ANSI  ETSI  ADSL FORUM  DAVIC  ATM FORUM  ITU

22. ADSL Activities Throughout the World ADSL Activities in the USA ADSL Activities in Asia & Australasia ADSL Activities in Europe

23. Next Topic What is ADSL ? What can ADSL do ? How does it work ? Architectural Options Status of the technology The Future

24. Broadband Network Broadband Switch Network (eg. ATM) Service Providers Servers & Billing Access Network Operational Support System New Optical Cable ADSL Local Exchange VDSL POTS High-Capacity Backbone Links

25. “Evolution of Digital Access” Voiceband Modem ISD N ADSL FTTH FTTx + VDSL Today Enhanced Copper Hybrid Fibre/Copper Pure Fibre

26. Asymmetric Digital Subscriber Line Introduction Slide Show Thank You for watching!