204325: data communications and computer networks932.3704.file_ref... · computer engineering...
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Transmission Media
Adapted from lecture slides by Behrouz A. Forouzan© The McGraw-Hill Companies, Inc. All rights reserved
Asst. Prof. Mahdi [email protected]
http://profs.basu.ac.ir/abbasiComputer Engineering Department
Bu-Ali Sina University, Hamedan, Iran.
Data Communication and Computer Networks
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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
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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 Digital 100 – 1000 Mbps Ethernet
5E 100 MHz Digital 100 – 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
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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
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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