Содержание
- 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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