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Chapter 9

Chapter 9. High-Speed Digital Access: DSL, Cable Modem, and SONET. 9.1 DSL Technology. ADSL Other DSL Technologies. Note :. ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses. Note :.

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Chapter 9

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  1. Chapter 9 High-SpeedDigital Access:DSL,Cable Modem, and SONET

  2. 9.1 DSL Technology ADSL Other DSL Technologies

  3. Note: ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses.

  4. Note: The existing local loops can handle bandwidths up to 1.1 MHz.

  5. Note: ADSL is an adaptive technology. The system uses a data rate based on the condition of the local loop line.

  6. Figure 9.1DMT

  7. Figure 9.2Bandwidth division

  8. Figure 9.3ADSL modem

  9. Figure 9.4DSLAM

  10. 9.2 Cable Modem Traditional Cable Networks HFC Network Sharing CM and CMTS DOCSIS

  11. Figure 9.5Traditional cable TV network

  12. Note: Communication in the traditional cable TV network is unidirectional.

  13. Figure 9.6HFC network

  14. Note: Communication in an HFC cable TV network can be bidirectional.

  15. Figure 9.7Coaxial cable bands

  16. Note: Downstream data are modulated using the 64-QAM modulation technique.

  17. Note: The theoretical downstream data rate is 30 Mbps.

  18. Note: Upstream data are modulated using the QPSK modulation technique.

  19. Note: The theoretical upstream data rate is 12 Mbps.

  20. Figure 9.8Cable modem

  21. Figure 9.9CMTS

  22. 9.3 SONET SONET Devices SONET Frame Frame Transmission Synchronous Transport Signals STS-1 Virtual Tributaries Higher-Rate Service

  23. Note: SONET is a synchronous TDM system controlled by a master clock.

  24. Figure 9.10A SONET

  25. Figure 9.11Frame format

  26. Table 9.1 SONET rates

  27. Figure 9.12Data rate

  28. Figure 9.13VT types

  29. Figure 9.14STS multiplexing

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