Chapter 7 Transmission Media

7.1

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Figure 7.1 Transmission medium and physical layer

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Figure 7.2 Classes of transmission media

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7-1 GUIDED MEDIA Guided G id d media, di which hi h are those th th t provide that id a conduit d it from one device to another, include twisted twisted--pair cable, coaxial i l cable, bl andd fiber fib fiber--optic ti cable. cable bl .

Topics discussed in this section: Twisted-Pair Cable Coaxial Cable Fiber-Optic Cable 7.4

Figure 7.3 Twisted-pair cable

7.5

Figure 7.4 UTP and STP cables

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Table 7.1 Categories of unshielded twisted-pair cables

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Figure 7.5 UTP connector

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Figure 7.6 UTP performance

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Figure 7.7 Coaxial cable

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Table 7.2 Categories of coaxial cables

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Figure 7.8 BNC connectors

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Figure 7.9 Coaxial cable performance

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Figure 7.10 Bending of light ray

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Figure 7.11 Optical fiber

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Figure 7.12 Propagation modes

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Figure 7.13 Modes

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Table 7.3 Fiber types

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Figure 7.14 Fiber construction

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Figure 7.15 Fiber-optic cable connectors

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Figure 7.16 Optical fiber performance

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7-2 UNGUIDED MEDIA: WIRELESS Unguided media transport electromagnetic waves without using a physical conductor. conductor. This type of communication is often referred to as wireless communication.. communication

Topics discussed in this section: Radio Waves Microwaves Infrared 7.22

Figure 7.17 Electromagnetic spectrum for wireless communication

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Figure 7.18 Propagation methods

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T bl 7.4 Table 7 4 Bands B d

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Figure 7.19 Wireless transmission waves

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Figure 7.20 Omnidirectional antenna

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Note

Radio waves are used for multicast communications, i ti such h as radio di and d television, and paging systems.

7.28

Figure 7.21 Unidirectional antennas

7.29

Note

Microwaves are used for unicast communication such as cellular telephones satellite networks, telephones, networks and wireless LANs.

7.30

Note

IInfrared f d signals i l can be b used d for f shorth t range communication in a closed area using line-of-sight propagation.

7.31

Chapter 7 Transmission Media - CPE.KU

electromagnetic waves without using a physical conductor conductor. This type of communication communication is often referred to as wireless communication communication is often referred to as wireless communication communication. Radio Waves. Topics discussed in this section: Microwaves. Infrared. 7.22 ...

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