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CS 313 Introduction to Computer Networking & Telecommunication

CS 313 Introduction to Computer Networking & Telecommunication. DSL and Cable. Topics. Digital Subscriber Line Cable ADSL versus Cable. Digital Subscriber Lines. Bandwidth versus distanced over category 3 UTP for DSL. Digital Subscriber Lines.

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CS 313 Introduction to Computer Networking & Telecommunication

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  1. CS 313 Introduction to Computer Networking & Telecommunication DSL and Cable Chi-Cheng Lin, Winona State University

  2. Topics • Digital Subscriber Line • Cable • ADSL versus Cable

  3. Digital Subscriber Lines • Bandwidth versus distanced over category 3 UTP for DSL.

  4. Digital Subscriber Lines • Operation of ADSL using discretemultitonemodulation (OFDM, actually) - Channels – 0: voice, 1-5: not used, 6-30 upstream, 31-255 downstream - Each channel: QAM at the rate of 4000 baud, 0-15 bits/symbol depending on SNR - Multiplexing: FDM? TDM? Both? None?

  5. Digital Subscriber Lines • A typical ADSL equipment configuration.

  6. Cable Television • Community Antenna Television • Internet over Cable • Spectrum Allocation • Cable Modems

  7. Community Antenna Television • An early cable television system.

  8. Internet over Cable • Cable television

  9. Compared to Telephone System • The fixed telephone system.

  10. Spectrum Allocation • Frequency allocation in a typical cable TV system used for Internet access

  11. Cable Modems • Typical details of the upstream and downstream channels in North America. - Three lights on the cable modem when it’s on … - 6-8 MHz channels  36 Mbps w/ QAM-64  27 Mbps w/ overhead subtracted - Multiplexing: FDM? TDM? Both? None? Anything else?

  12. ADSL versus Cable • Discussions … • Bandwidth capacity • Availability • Security • Reliability

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