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Rong Wang CGS3285 Spring 2004

Transmission Media. Rong Wang CGS3285 Spring 2004. From textbooks: Chapter 7 of Data Communications and Networking, 3rd Edition, Behrouz A. Forouzan (ISBN: 0-07-251584-8) . Recommended Reading. Figure 7.1 Transmission medium and physical layer. Figure 7.2 Classes of transmission media.

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Rong Wang CGS3285 Spring 2004

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  1. TransmissionMedia Rong Wang CGS3285 Spring 2004

  2. From textbooks: Chapter 7 of Data Communications and Networking, 3rd Edition, Behrouz A. Forouzan (ISBN: 0-07-251584-8) Recommended Reading

  3. Figure 7.1Transmission medium and physical layer

  4. Figure 7.2Classes of transmission media

  5. 7.1 Guided Media Twisted-Pair Cable Coaxial Cable Fiber-Optic Cable

  6. Twisted Pair • Consists of two insulated copper wires: one for carrying signal the other for ground reference • Twisted together to decrease the crosstalk interference between adjacent pairs in a cable

  7. Unshielded versus Shielded Twisted-Pair Cable • Unshielded Twisted-Pair (UTP) • Most commonly used • Cheaper than STP • Shielded Twisted-Pair Cable (STP) • Has a metal foil or braided-mesh covering that encases each pair of insulated conductors • Bulkier and more expensive

  8. Table 7.1 Categories of unshielded twisted-pair cables

  9. UTP connector

  10. Figure 7.6UTP performance

  11. Analog Amplifiers every 5km to 6km Digital Use either analog or digital signals repeater every 2km or 3km Limited distance Limited bandwidth (1MHz) Limited data rate (100Mbps) Susceptible to interference and noise TWISTED PAIR – Transmission Characteristics

  12. Most common medium Often used in buildings for LAN and PBX station connections Also used in telco outside plant (local loops) For local area networks (LAN) 10Mbps or 100Mbps Can carry both voice and data TWISTED PAIR - Applications

  13. Telephone channel bandwidth

  14. Coaxial Cable

  15. Figure 7.8BNC connectors • Terminator is used to prevent the reflection

  16. Figure 7.9Coaxial cable performance

  17. Analog Amplifiers every few km Closer if higher frequency Up to 500MHz Digital Repeater every 1km Closer for higher data rates Less susceptible to interference and crosstalk than twisted pair Transmission Characteristics

  18. Most versatile medium Television distribution Ariel to TV Cable TV Long distance telephone transmission Can carry 10,000 voice calls simultaneously Being replaced by fiber optic Short distance computer systems links Local area networks Application

  19. Figure 7.10Bending of light ray

  20. Optical fiber

  21. Figure 7.14Fiber construction

  22. Figure 7.15Fiber-optic cable connectors

  23. Figure 7.16Optical fiber performance

  24. Advantages: Higher bandwidth Less signal attenuation Less interference Resistance to corrosive materials Light weight More immune to tapping Disadvantages Expensive to install Advantages and disadvantages

  25. Long-haul trunks Metropolitan trunks Rural exchange trunks Subscriber loops LANs Other Backbone networks TV distribution Application

  26. Guided transmission media summary

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