Physical Layer Computer Networks.

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Presentation transcript:

Physical Layer Computer Networks

Where are we?

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

Baseband and Broadband

Phase Modulation

Modems

Digital Encoding

CSU/DSU

Undesirable Effects and Limitations Propagation Delay Bandwidth Noise Interference Distortion Attenuation

Sampling and Nyquist’s Theorem

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.

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

Transmission Media

Connectors

Media Test and Measurement Hands-on Demo

Repeaters Signal Regeneration Clean up Amplifly Distance Extension

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

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

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