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Understanding DSL and Cable Networking for Efficient Telecommunication

Explore the fundamentals of Digital Subscriber Line (DSL) and Cable networking, comparing aspects such as bandwidth, operations, and equipment configurations. Delve into the utilization of channels and spectrum allocation for enhanced networking capabilities. Gain insights into ADSL versus Cable discussions covering bandwidth capacity, availability, security, and reliability considerations.

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Understanding DSL and Cable Networking for Efficient 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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