CSI 4118Fall 20021 Part I Signals, Media, And Data Transmission.

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Presentation transcript:

CSI 4118Fall Part I Signals, Media, And Data Transmission

Fall CSI 4118 Transmission of Information Well-understood basics From physics Energy Electromagnetic wave propagation From mathematics Coding theory

Fall CSI 4118 Transmission Media Copper wire Need two wires Possibilities Twisted pair Coaxial cable Optical fiber Flexible Light “stays in” Air / space Used for electromagnetic transmission

Fall CSI 4118 Forms of Energy Used To Transmit Data Electric current Audible sounds Omni-directional electromagnetic waves Radio Frequency (RF) Infrared

Fall CSI 4118 Forms of Energy Used to Transmit Data (continued) Directional electromagnetic waves Point-to-point satellite channel Limited broadcast (spot beam) Microwave Laser beam

Fall CSI 4118 Types of Satellites Geosynchronous Earth Orbit (GEO) Low Earth Orbit (LEO) Array needed

Fall CSI 4118 Two Important Physical Limits Of a Transmission System Propagation delay Time required for signal to travel across media Example: electromagnetic radiation travels through space at the speed of light (c = 3*10 8 meters per second) Bandwidth Maximum times per second the signal can change

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