7.1 Chapter 7 Transmission Media Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

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7.1 Chapter 7 Transmission Media Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

7.2 Figure 7.1 Transmission medium and physical layer

7.3 Figure 7.2 Classes of transmission media

GUIDED MEDIA Guided media, which are those that provide a conduit from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable. Twisted-Pair Cable Coaxial Cable Fiber-Optic Cable Topics discussed in this section:

7.5 Figure 7.3 Twisted-pair cable Metallic copper conductors that accepts and transport signals in the form of electric current.

7.6 Figure 7.4 UTP and STP cables

7.7 Table 7.1 Categories of unshielded twisted-pair cables

7.8 Figure 7.5 UTP connector

7.9 Figure 7.6 UTP performance

7.10 Figure 7.7 Coaxial cable

7.11 Table 7.2 Categories of coaxial cables

7.12 Figure 7.8 BNC connectors Bayone Neill Concelman TV set Reflection of the signal

7.13 Figure 7.10 Bending of light ray

7.14 Figure 7.11 Optical fiber

7.15 Figure 7.12 Propagation modes

7.16 Figure 7.13 Modes

7.17 Table 7.3 Fiber types

7.18 Figure 7.14 Fiber construction

7.19 Figure 7.15 Fiber-optic cable connectors

7.20 Figure 7.16 Optical fiber performance

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

7.22 Figure 7.17 Electromagnetic spectrum for wireless communication

7.23 Figure 7.18 Propagation methods

7.24 Table 7.4 Bands

7.25 Figure 7.19 Wireless transmission waves

7.26 Figure 7.20 Omnidirectional antenna Propagated in all directions

7.27 Radio waves are used for multicast communications, such as radio and television, and paging systems. Note

7.28 Figure 7.21 Unidirectional antennas

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

7.30 Infrared signals can be used for short- range communication in a closed area using line-of-sight propagation. Note