1. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Chapter 9 High-Speed Digital Access: DSL, Cable Modem, and SONET

2. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 9.1 DSL Technology ADSL Other DSL Technologies

3. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses. Note:

4. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 The existing local loops can handle bandwidths up to 1.1 MHz. Note:

5. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 ADSL is an adaptive technology. The system uses a data rate based on the condition of the local loop line. Note:

6. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.1 DMT

7. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.2 Bandwidth division

8. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.3 ADSL modem

9. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.4 DSLAM

10. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 9.2 Cable Modem Traditional Cable Networks HFC Network Sharing CM and CMTS DOCSIS

11. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.5 Traditional cable TV network

12. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Communication in the traditional cable TV network is unidirectional. Note:

13. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.6 HFC network

14. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Communication in an HFC cable TV network can be bidirectional. Note:

15. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.7 Coaxial cable bands

16. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Downstream data are modulated using the 64-QAM modulation technique. Note:

17. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004. The theoretical downstream data rate is 30 Mbps. Note:

18. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Upstream data are modulated using the QPSK modulation technique. Note:

19. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 The theoretical upstream data rate is 12 Mbps. Note:

20. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.8 Cable modem

21. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.9 CMTS

22. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 9.3 SONET SONET Devices SONET Frame Frame Transmission Synchronous Transport Signals STS-1 Virtual Tributaries Higher-Rate Service

23. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 SONET is a synchronous TDM system controlled by a master clock. Note:

24. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.10 A SONET

25. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.11 Frame format

26. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Table 9.1 SONET rates STSOCRate (Mbps)SPE (Mbps)User (Mbps) STS-1OC-151.8450.1249.536 STS-3OC-3155.52150.336148.608 STS-9OC-9466.56451.008445.824 STS-12OC-12622.08601.344594.432 STS-18OC-18933.12902.016891.648 STS-24OC-241244.161202.6881188.864 STS-36OC-361866.231804.0321783.296 STS-48OC-482488.322405.3762377.728 STS-192OC-1929953.289621.6049510.912

27. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.12 Data rate

28. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.13 VT types

29. McGraw-Hill©The McGraw-Hill Companies, Inc., 2004 Figure 9.14 STS multiplexing