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Understanding Asymmetric Digital Subscriber Line (ADSL) Technology

Explore the benefits and drawbacks of ADSL, a high-speed data link technology utilizing special modems, endpoints, and differing schemes such as CAP, QAM, and DMT. Uncover advantages like always-on connectivity, ease of use, reliability, security, and speed, along with challenges like availability, signal leaking, installation costs, and lack of standardization. Learn about the need for ADSL to extend access distance, enhance speed, and standardize for improved performance.

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Understanding Asymmetric Digital Subscriber Line (ADSL) Technology

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  1. Asymmetric Digital Subscriber Line(ADSL)

  2. Table of Contents • Introduction • Advantages • Drawbacks • Conclusion

  3. Introduction • High speed data link. • Pure network connection. • Coming with different schemes: CAP, QAM, and DMT. • Using special modems called endpoints

  4. Server CORE Network ADSL Existing Copper ADSL 1.5 to 9 Mbps Internet 16 to 640 kbps ADSL Connection

  5. Advantages • Connectivity – always connected • Ease of use • Reliability • Security • Speed

  6. Echo Cancellation FDM Upstream Downstream Upstream Downstream POTS POTS Frequency 1 Mhz Frequency 1 Mhz Create Multiple Channel

  7. Nyquist’s Theorem • Maximum data rate = 2H log2V bits/sec H = low-pass filter of bandwidth V = signal discrete levels

  8. Drawbacks • Availability • Signal leaking • Cost of installation and equipment • Not standardization

  9. Telephone line Voice (only) Splitter Voice + ADSL ADSL (only) ADSL modem Phone Phone Fig. 1 ADSL Problem

  10. Telephone line Voice (+ ADSL leakage) Splitter Voice + ADSL ADSL (only) ADSL Filter ADSL modem Phone Phone Fig. 2 ADSL Problem

  11. Conclusion • ADSL is a high speed access to internet. • ADSL has advantages but it also has limitations. • ADSL needs to extend the access distance. • ADSL might improve the speed. • ADSL needs to be standardized.

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