transmission media 01204325: data communication and computer networks asst. prof. chaiporn jaikaeo,...
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Transmission Media
01204325: Data Communication and Computer Networks
Asst. Prof. Chaiporn Jaikaeo, [email protected]
http://www.cpe.ku.ac.th/~cpjComputer Engineering Department
Kasetsart University, Bangkok, ThailandAdapted from lecture slides by Behrouz A. Forouzan© The McGraw-Hill Companies, Inc. All rights reserved
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Physical Layer
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Classes of Transmission Media
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Guided Media Provide a conduit from one device to
another Include
twisted-pair cables coaxial cables fiber-optic cables
Guided Media:Copper Media
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Twisted-Pair Cable
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UTP – Unshielded Twisted Pair STP –Shielded Twisted Pair
UTP and STP Cables
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Categories of UTP/STP Cables
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Categories of UTP/STP Cables
Category Bandwidth Digital/Analog Use
1 very low Analog Telephone
2 < 2 MHz Analog/digital 4Mbps token ring
3 16 MHz Digital 10-100 Mbps Ethernet
4 20 MHz Digital 16 Mbps token ring
5 100 MHz Digital100 – 1000 Mbps
Ethernet
5E 100 MHz Digital100 – 1000 Mbps
Ethernet
6 250 MHz Digital 1 – 10 Gbps Ethernet
6A 500 MHz Digital 1 – 10 Gbps Ethernet
7 600 MHz Digital 10 Gbps Ethernet
7A 1000 MHz Digital 40-100 Gbps Ethernet
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RJ – Registered Jack
UTP Connectors
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UTP Performance
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Coaxial Cable
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RG – Radio Government
Categories of Coaxial Cables
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BNC Connectors Bayonet Network Connector
aka. Bayonet Neil-Concelman Used with coaxial cables
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Performance of Coaxial Cables
Guided Media: Optical Media
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Optical Fiber Based on physics of light
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Optical Fiber
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Propagation Modes
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Fiber Types
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Fiber Construction
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Fiber-Optic Cable Connectors
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Optical Fiber Performance
Unguided Media
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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