Transmission Media

Сентябрь 14, 2022

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Transmission Media

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2. NDSLab Copyright@2008 Figure 7.1 Transmission medium and physical layer
3. NDSLab Copyright@2008 Transmission Media By definition Broadly defined as anything that can carry information from a
4. NDSLab Copyright@2008 Figure 7.2 Classes of transmission media
5. NDSLab Copyright@2008 7-1 GUIDED MEDIA Guided media, which are those that provide a conduit from one
6. NDSLab Copyright@2008 Figure 7.3 Twisted-pair cable
7. NDSLab Copyright@2008 Figure 7.4 UTP and STP cables Unshielded Twisted-Pair (UTP) Shielded Twisted-Pair (STP)
8. NDSLab Copyright@2008 Unshielded vs Shielded Twisted-Pair Cable Unshielded twisted-pair (UTP) Shielded twisted-pair (STP) Has a metal
9. NDSLab Copyright@2008 Table 7.1 Categories of unshielded twisted-pair cables
10. NDSLab Copyright@2008 Figure 7.5 UTP connector
11. NDSLab Copyright@2008 Figure 7.6 UTP performance Gauge is a measure of the thickness of the wire.
12. NDSLab Copyright@2008 Figure 7.7 Coaxial cable
13. NDSLab Copyright@2008 Table 7.2 Categories of coaxial cables
14. NDSLab Copyright@2008 Figure 7.8 BNC connectors
15. NDSLab Copyright@2008 Figure 7.9 Coaxial cable performance
16. NDSLab Copyright@2008 Figure 7.10 Bending of light ray
17. NDSLab Copyright@2008 Figure 7.11 Optical fiber
18. NDSLab Copyright@2008 Figure 7.12 Propagation modes
19. NDSLab Copyright@2008 Figure 7.13 Modes
20. NDSLab Copyright@2008 Table 7.3 Fiber types
21. NDSLab Copyright@2008 Figure 7.14 Fiber construction
22. NDSLab Copyright@2008 Figure 7.15 Fiber-optic cable connectors
23. NDSLab Copyright@2008 Figure 7.16 Optical fiber performance
24. NDSLab Copyright@2008 7-2 UNGUIDED MEDIA: WIRELESS Unguided media transport electromagnetic waves without using a physical conductor.
25. NDSLab Copyright@2008 Figure 7.17 Electromagnetic spectrum for wireless communication
26. NDSLab Copyright@2008 Figure 7.18 Propagation methods
27. NDSLab Copyright@2008 Table 7.4 Bands
28. NDSLab Copyright@2008 Figure 7.19 Wireless transmission waves
29. NDSLab Copyright@2008 Figure 7.20 Omnidirectional antenna
30. NDSLab Copyright@2008 Radio waves are used for multicast communications, such as radio and television, and paging
31. NDSLab Copyright@2008 Figure 7.21 Unidirectional antennas
32. NDSLab Copyright@2008 Microwaves are used for unicast communication such as cellular telephones, satellite networks, and wireless
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NDSLab Copyright@2008
Figure 7.1 Transmission medium and physical layer

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NDSLab Copyright@2008
Transmission Media
By definition
Broadly defined as anything that can carry information

from a source to a destination.
e.g., air, twisted-pair cable, coaxial cable, fiber-optic cable, conductor, and so on.
Guided media
Provide a conduit from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable.

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NDSLab Copyright@2008
Figure 7.2 Classes of transmission media

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NDSLab Copyright@2008
7-1 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:

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NDSLab Copyright@2008
Figure 7.3 Twisted-pair cable

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NDSLab Copyright@2008
Figure 7.4 UTP and STP cables
Unshielded Twisted-Pair (UTP)
Shielded Twisted-Pair (STP)

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Unshielded vs Shielded Twisted-Pair Cable
Unshielded twisted-pair (UTP)
Shielded twisted-pair (STP)
Has a

metal foil or braided-mesh covering that encases each pair of insulated conductors.
Category
Electronic Industries Association (EIA) has developed standards to classify unshielded twisted-pair cable into seven categories. Table 7.1 shows these categories.
Connectors
Most common UTP connector is RJ-45 (RJ stands for registered jack).

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