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Part II. Physical Layer and Media

Learn about the three types of guided media for data transfer - twisted-pair, coaxial, and fiber-optic cables. Explore topics such as twisting, categories, connectors, and propagation modes. Discover the world of wireless communication through unguided media like radio waves, microwaves, and infrared. Gain insights into electromagnetic spectrum, propagation methods, and wireless transmission waves.

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Part II. Physical Layer and Media

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  1. Part II. Physical Layer and Media Chapter 7. Transmission Media COMP 3270 Computer Networks Computing Science Thompson Rivers University

  2. Learning Objectives • List the three types of guided media. • State the reason why higher frequency radio band can transfer more data.

  3. Transmission medium and physical layer

  4. Classes of transmission media

  5. 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. Topics discussed in this section: • Twisted-Pair Cable • Coaxial Cable • Fiber-Optic Cable

  6. Twisted-pair cable Twisting: to reduce the mutual interference

  7. UTP and STP cables Unshielded Twisted Pair Shielded Twisted Pair

  8. Categories of UTP cables

  9. Coaxial cable

  10. Categories of coaxial cables

  11. BNC connectors

  12. Optical Fiber

  13. Bending of light ray

  14. Optical fiber

  15. Propagation modes

  16. Using reflection Using refraction These days

  17. Fiber-optic cable connectors

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

  19. Electromagnetic spectrum for wireless communication Microwave 30 GHz

  20. Propagation methods Diffraction Reflection

  21. Bands

  22. Wireless transmission waves ~ 30 G ~ 300 G ~ 400 THz

  23. Omnidirectional antenna

  24. Unidirectional antennas

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