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DSL - Digital Subscriber Line An Overview

DSL - Digital Subscriber Line An Overview. Presented by Team 1 November 17, 2001. ADSL Contents. Origins of ADSL Definition ADSL Standards – US Typical ADSL Installation Technical Description Evaluation A View to the Future. Origins of ADSL. Availability of Cabling

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DSL - Digital Subscriber Line An Overview

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  1. DSL - Digital Subscriber LineAn Overview Presented by Team 1 November 17, 2001

  2. ADSL Contents • Origins of ADSL • Definition • ADSL Standards – US • Typical ADSL Installation • Technical Description • Evaluation • A View to the Future

  3. Origins of ADSL • Availability of Cabling • Need for Faster Communication • Internet EXPLOSION! • Expense of ISDN • Emergence of Telecommuting • New Applications

  4. Definition • Asymmetric DSL (ADSL) “a modem technology that converts existing twisted pair telephone lines into access paths for multimedia and high speed data communications.” Source: "ADSL Tutorial: Twisted Pair Access to the Information Highway," http://www.adsl.com/aboutdsl/adsl_tutorial.html

  5. ADSL Standards - US • ANSI T1E1 working group • ITU-T Study Group 15 • ADSL Forum • Recommends end-to-end ADSL architectures, including the higher layer protocols needed to make ADSL systems useful products.

  6. Typical ADSL Installation

  7. Technical DescriptionGeneral • Frequency: Above 25kHz • POTS Below 4kHz • Modulation: • DMT Discrete Multi-tone • CAP Carrier-less Amplitude/ Phase Modulation • QAM Quadrature Amplitude Modulation • Medium: Unshielded Twisted Pair • 24 AWG (~.5m) • 26 AWG (~.4m)

  8. Technical DescriptionTransmission Rates • Class I 6,175 Mb/s • 6,000 ft 26 AWG loops • Class II 4.632 Mb/s • 8,000 ft 26 AWG • Class III 3.088 Mb/s • 12000 ft 24 AWG • 9000 ft 26 AWG • Class IV 1.544 Mb/s • 18000 ft 26 AWG

  9. Central Office Public Switched Voice Network Combined Voice and IP Data To DSLAM Copper Wire Internet High Speed IP Data Data Switch Splitter IP Data ADSL Modem Home PC ATU-R w/Ethernet NIC Voice & IP Address Analog Modem Telephone Fax Laptop computer Installation Components . Source: Paradyne, Inc.

  10. ADSL - An Evaluation • Targeted Marketplace • Chief Competitors • Price Considerations • Economy • Other Barriers

  11. ADSL - A View to the Future • Interim Strategy • Copper • Cable • Fiber • Telecommunications Shake-Out • Emergence of True Wireless Solutions

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