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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 Need for Faster Communication Internet EXPLOSION! Expense of ISDN Emergence of Telecommuting New Applications 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 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. Typical ADSL Installation Technical Description General Frequency: Above 25kHz – POTS Below 4kHz Modulation: – DMT – CAP Discrete Multi-tone Carrier-less Amplitude/ Phase Modulation – QAM Quadrature Amplitude Modulation Medium: Unshielded Twisted Pair – 24 AWG (~.5m) – 26 AWG (~.4m) Technical Description Transmission Rates Class I – 6,000 ft Class II – 8,000 ft Class III – 12000 ft – 9000 ft Class IV – 18000 ft 6,175 Mb/s 26 AWG loops 4.632 Mb/s 26 AWG 3.088 Mb/s 24 AWG 26 AWG 1.544 Mb/s 26 AWG Installation Components Central Office . Public Switched Voice Network Combined Voice and IP Data To Internet DSLAM High Speed Data Switch IP Data Copper Wire IP Data Splitter ADSL Modem ATU-R Voice Home PC w/Ethernet NIC & IP Address Analog Modem Telephone Fax Source: Paradyne, Inc. Laptop computer ADSL - An Evaluation Targeted Marketplace Chief Competitors Price Considerations Economy Other Barriers ADSL - A View to the Future Interim Strategy – Copper – Cable – Fiber Telecommunications ShakeOut Emergence of True Wireless Solutions