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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 9.3ADSL modem

  8. Figure 9.4DSLAM

  9. 9.2 Cable Modem Traditional Cable Networks HFC Network Sharing CM and CMTS DOCSIS

  10. Figure 9.5Traditional cable TV network

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

  12. Figure 9.6HFC network

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

  14. Figure 9.7Coaxial cable bands

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

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

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

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

  19. Figure 9.8Cable modem

  20. Figure 9.9CMTS

  21. 9.3 SONET SONET Devices SONET Frame Frame Transmission Synchronous Transport Signals STS-1 Virtual Tributaries Higher-Rate Service

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

  23. Figure 9.10A SONET

  24. Figure 9.11Frame format

  25. Table 9.1 SONET rates

  26. Figure 9.12Data rate

  27. Figure 9.13VT types

  28. Figure 9.14STS multiplexing

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