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Physical Layer

Physical Layer. Computer Networks. Numbering Systems. Binary Hexadecimal Decimal. Transmission of Information. From Physics Energy Electromagnetic wave propogation From Mathematics Coding Theory. Analog and Digital Signaling. Amplitude Modulation. Frequency Modulation.

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Physical Layer

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  1. Physical Layer Computer Networks John Kristoff

  2. Numbering Systems • Binary • Hexadecimal • Decimal John Kristoff

  3. Transmission of Information • From Physics • Energy • Electromagnetic wave propogation • From Mathematics • Coding Theory John Kristoff

  4. Analog and Digital Signaling John Kristoff

  5. Amplitude Modulation John Kristoff

  6. Frequency Modulation John Kristoff

  7. Baseband and Broadband John Kristoff

  8. Phase Modulation John Kristoff

  9. Modems John Kristoff

  10. Digital Encoding John Kristoff

  11. CSU/DSU John Kristoff

  12. Undesirable Effects and Limitations • Propagation Delay • Bandwidth • Noise • Interference • Distortion • Attenuation John Kristoff

  13. Sampling and Nyquist’s Theorem John Kristoff

  14. Shannon’s Limit • Corrects for SNR • Encoding more bits per cycle time helps, but you cannot overcome the fundamental physical limits of a real transmission system. John Kristoff

  15. Timing • Asynchronous • bit level • Synchronous • character level • Isochronous • timing coordination must be successful John Kristoff

  16. Transmission Media John Kristoff

  17. Connectors John Kristoff

  18. Media Test and Measurement • Hands-on Demo John Kristoff

  19. Repeaters • Signal Regeneration • Clean up • Amplifly • Distance Extension John Kristoff

  20. Hubs • Repeater functionality, plus... • Concentration Point • Signal Distribution Device • Management Functions John Kristoff

  21. Usable capacity Determined by engineering Electrical Property Determined by physics Throughput versus Bandwidth John Kristoff

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