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

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

10. Coaxial cable

11. Categories of coaxial cables

12. BNC connectors

13. Optical Fiber

14. Bending of light ray

15. Optical fiber

16. Propagation modes

17. Using reflection Using refraction These days

18. Fiber-optic cable connectors

19. 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. Radio Waves Microwaves Infrared Topics discussed in this section:

20. Electromagnetic spectrum for wireless communication 30 GHz Microwave

21. Propagation methods DiffractionReflection

22. Bands

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

24. Omnidirectional antenna

25. Unidirectional antennas