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

1 7.1 Chapter 7 Transmission Media Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

2 7.2 Figure 7.1 Transmission medium and physical layer

3 7.3 Figure 7.2 Classes of transmission media

4 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:

5 7.5 Figure 7.3 Twisted-pair cable Metallic copper conductors that accepts and transport signals in the form of electric current.

6 7.6 Figure 7.4 UTP and STP cables

7 7.7 Table 7.1 Categories of unshielded twisted-pair cables

8 7.8 Figure 7.5 UTP connector

9 7.9 Figure 7.6 UTP performance

10 7.10 Figure 7.7 Coaxial cable

11 7.11 Table 7.2 Categories of coaxial cables

12 7.12 Figure 7.8 BNC connectors Bayone Neill Concelman TV set Reflection of the signal

13 7.13 Figure 7.10 Bending of light ray

14 7.14 Figure 7.11 Optical fiber

15 7.15 Figure 7.12 Propagation modes

16 7.16 Figure 7.13 Modes

17 7.17 Table 7.3 Fiber types

18 7.18 Figure 7.14 Fiber construction

19 7.19 Figure 7.15 Fiber-optic cable connectors

20 7.20 Figure 7.16 Optical fiber performance

21 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:

22 7.22 Figure 7.17 Electromagnetic spectrum for wireless communication

23 7.23 Figure 7.18 Propagation methods

24 7.24 Table 7.4 Bands

25 7.25 Figure 7.19 Wireless transmission waves

26 7.26 Figure 7.20 Omnidirectional antenna Propagated in all directions

27 7.27 Radio waves are used for multicast communications, such as radio and television, and paging systems. Note

28 7.28 Figure 7.21 Unidirectional antennas

29 7.29 Microwaves are used for unicast communication such as cellular telephones, satellite networks, and wireless LANs. Note

30 7.30 Infrared signals can be used for short- range communication in a closed area using line-of-sight propagation. Note