Transmission Media Chaiporn Jaikaeo Department of Computer Engineering Kasetsart University 01204325 Data Communications and Computer Networks Based on lecture materials from Data Communications and Networking, 5 th ed., Behrouz A. Forouzan, McGraw Hill, 2012. Revised 2019-08-12
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Transmission Mediacpj/204325/slides/04-media.pdfTransmission Media Chaiporn Jaikaeo Department of Computer Engineering Kasetsart University 01204325 Data Communications and Computer
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Transmission Media
Chaiporn Jaikaeo
Department of Computer EngineeringKasetsart University
01204325 Data Communications and Computer Networks
Based on lecture materials from Data Communications and Networking, 5th ed.,Behrouz A. Forouzan, McGraw Hill, 2012.
Unguided Media: Wireless• Transport electromagnetic waves without using a physical
conductor◦ Radio Waves◦ Microwaves◦ Infrared
•Often referred to as wireless communication
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Electromagnetic Spectrum
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Propagation Methods
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Bands
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Antennas
Omni-directional Antenna Unidirectional Antennas
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Wireless Transmission Waves
used for multicast/broadcast communications, such as radio and television
used for unicast communication such as cellular telephones, satellite networks,and wireless LANs
used for short-range communication in a closed area using line-of-sight propagation
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Summary•Guided media serve as conduits for signals to propagate•Copper media carry electrical signals •Optical fibers carry optical signals•Unguided media allow signals to propagate without any