Ch 09

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Ch 09

  1. 1. Chapter 9 High-Speed Digital Access: DSL, Cable Modem, and SONET
  2. 2. 9.1 DSL Technology ADSL Other DSL Technologies
  3. 3. ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses. Note :
  4. 4. The existing local loops can handle bandwidths up to 1.1 MHz. Note :
  5. 5. ADSL is an adaptive technology. The system uses a data rate based on the condition of the local loop line. Note :
  6. 6. Figure 9.1 DMT
  7. 7. Figure 9.2 Bandwidth division
  8. 8. Figure 9.3 ADSL modem
  9. 9. Figure 9.4 DSLAM
  10. 10. 9.2 Cable Modem Traditional Cable Networks HFC Network Sharing CM and CMTS DOCSIS
  11. 11. Figure 9.5 Traditional cable TV network
  12. 12. Communication in the traditional cable TV network is unidirectional. Note :
  13. 13. Figure 9.6 HFC network
  14. 14. Communication in an HFC cable TV network can be bidirectional. Note :
  15. 15. Figure 9.7 Coaxial cable bands
  16. 16. Downstream data are modulated using the 64-QAM modulation technique. Note :
  17. 17. The theoretical downstream data rate is 30 Mbps . Note :
  18. 18. Upstream data are modulated using the QPSK modulation technique. Note :
  19. 19. The theoretical upstream data rate is 12 Mbps. Note :
  20. 20. Figure 9.8 Cable modem
  21. 21. Figure 9.9 CMTS
  22. 22. 9.3 SONET SONET Devices SONET Frame Frame Transmission Synchronous Transport Signals STS-1 Virtual Tributaries Higher-Rate Service
  23. 23. SONET is a synchronous TDM system controlled by a master clock. Note :
  24. 24. Figure 9.10 A SONET
  25. 25. Figure 9.11 Frame format
  26. 26. Table 9.1 SONET rates 2377.728 2405.376 2488.32 OC-48 STS-48 9510.912 9621.604 9953.28 OC-192 STS-192 OC-36 OC-24 OC-18 OC-12 OC-9 OC-3 OC-1 OC 1783.296 1804.032 1866.23 STS-36 1188.864 1202.688 1244.16 STS-24 891.648 902.016 933.12 STS-18 594.432 601.344 622.08 STS-12 445.824 451.008 466.56 STS-9 148.608 150.336 155.52 STS-3 49.536 50.12 51.84 STS-1 User (Mbps) SPE (Mbps) Rate (Mbps) STS
  27. 27. Figure 9.12 Data rate
  28. 28. Figure 9.13 VT types
  29. 29. Figure 9.14 STS multiplexing

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