1 Physical Layer Computer Networks. 2 Where are we?

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Presentation transcript:

1 Physical Layer Computer Networks

2 Where are we?

3 Numbering Systems Binary Hexadecimal Decimal

4 Transmission of Information From Physics Energy Electromagnetic wave propogation From Mathematics Coding Theory

5 Analog and Digital Signaling

6 Amplitude Modulation

7 Frequency Modulation

8 Baseband and Broadband

9 Phase Modulation

10 Modems

11 Digital Encoding

12 CSU/DSU

13 Undesirable Effects and Limitations Propagation Delay Bandwidth Noise Interference Distortion Attenuation

14 Sampling and Nyquist’s Theorem

15 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.

16 Timing Asynchronous bit level Synchronous character level Isochronous timing coordination must be successful

17 Transmission Media

18 Connectors

19 Media Test and Measurement Hands-on Demo

20 Repeaters Signal Regeneration Clean up Amplifly Distance Extension

21 Hubs Repeater functionality, plus... Concentration Point Signal Distribution Device Management Functions

22 Throughput versus Bandwidth Usable capacity Determined by engineering Electrical Property Determined by physics

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