LECTURE-9      REFERENCE:           Chapter 9         Using Telephone       and Cable Networks      for Data Transmission9...
9-1 TELEPHONE NETWORK  Telephone networks use circuit switching. The  telephone network had its beginnings in the late  18...
Figure 9.1 A telephone system                 Local loop                                        Trunk              Trunk  ...
Note        Intra-LATA services are provided by               local exchange carriers.              Since 1996, there are ...
Figure 9.2 Switching offices in a LATA9.5
Figure 9.3 Point of presences (POPs)9.6
Note      The tasks of data transfer and signaling        are separated in modern telephone      networks: data transfer i...
Figure 9.4 Data transfer and signaling networks9.8
Figure 9.5 Layers in SS79.9
9-2 DIAL-UP MODEMS  Traditional telephone lines can carry frequencies  between 300 and 3300 Hz, giving them a bandwidth of...
Figure 9.6 Telephone line bandwidth9.11
Note                      Modem         stands for modulator/demodulator.9.12
Figure 9.7 Modulation/demodulation9.13
Figure 9.8 The V.32 and V.32bis constellation and bandwidth9.14
Figure 9.9 Uploading and downloading in 56K modems9.15
9-3 DIGITAL SUBSCRIBER LINE  After traditional modems reached their peak data rate,  telephone companies developed another...
Note       ADSL is an asymmetric communication        technology designed for residential       users; it is not suitable ...
Note         The existing local loops can handle             bandwidths up to 1.1 MHz.9.18
Note          ADSL is an adaptive technology.            The system uses a data rate             based on the condition of...
Figure 9.10 Discrete multitone technique9.20
Figure 9.11 Bandwidth division in ADSL9.21
Figure 9.12 ADSL modem9.22
Figure 9.13 DSLAM9.23
Table 9.2 Summary of DSL technologies9.24
9-4 CABLE TV NETWORKS  The cable TV network started as a video service  provider, but it has moved to the business of Inte...
Figure 9.14 Traditional cable TV network9.26
Note       Communication in the traditional cable          TV network is unidirectional.9.27
Figure 9.15 Hybrid fiber-coaxial (HFC) network9.28
Note         Communication in an HFC cable TV           network can be bidirectional.9.29
9-5 CABLE TV FOR DATA TRANSFER  Cable companies are now competing with telephone  companies for the residential customer w...
Figure 9.16 Division of coaxial cable band by CATV9.31
Note       Downstream data are modulated using        the 64-QAM modulation technique.9.32
Note        The theoretical downstream data rate                     is 30 Mbps.9.33
Note       Upstream data are modulated using the            QPSK modulation technique.9.34
Note         The theoretical upstream data rate                     is 12 Mbps.9.35
Figure 9.17 Cable modem (CM)9.36
Figure 9.18 Cable modem transmission system (CMTS)9.37
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Lecture-9 Data Communication ~www.fida.com.bd

  1. 1. LECTURE-9 REFERENCE: Chapter 9 Using Telephone and Cable Networks for Data Transmission9.1 www.fida.com.bd
  2. 2. 9-1 TELEPHONE NETWORK Telephone networks use circuit switching. The telephone network had its beginnings in the late 1800s. The entire network, which is referred to as the plain old telephone system (POTS), was originally an analog system using analog signals to transmit voice. Topics discussed in this section: Major Components LATAs Signaling Services Provided by Telephone Networks9.2
  3. 3. Figure 9.1 A telephone system Local loop Trunk Trunk End Tandem • offices offices Regional offices9.3
  4. 4. Note Intra-LATA services are provided by local exchange carriers. Since 1996, there are two types of LECs: incumbent local exchange carriers and competitive local exchange carriers.9.4
  5. 5. Figure 9.2 Switching offices in a LATA9.5
  6. 6. Figure 9.3 Point of presences (POPs)9.6
  7. 7. Note The tasks of data transfer and signaling are separated in modern telephone networks: data transfer is done by one network, signaling by another.9.7
  8. 8. Figure 9.4 Data transfer and signaling networks9.8
  9. 9. Figure 9.5 Layers in SS79.9
  10. 10. 9-2 DIAL-UP MODEMS Traditional telephone lines can carry frequencies between 300 and 3300 Hz, giving them a bandwidth of 3000 Hz. All this range is used for transmitting voice, where a great deal of interference and distortion can be accepted without loss of intelligibility. Topics discussed in this section: Modem Standards9.10
  11. 11. Figure 9.6 Telephone line bandwidth9.11
  12. 12. Note Modem stands for modulator/demodulator.9.12
  13. 13. Figure 9.7 Modulation/demodulation9.13
  14. 14. Figure 9.8 The V.32 and V.32bis constellation and bandwidth9.14
  15. 15. Figure 9.9 Uploading and downloading in 56K modems9.15
  16. 16. 9-3 DIGITAL SUBSCRIBER LINE After traditional modems reached their peak data rate, telephone companies developed another technology, DSL, to provide higher-speed access to the Internet. Digital subscriber line (DSL) technology is one of the most promising for supporting high-speed digital communication over the existing local loops. Topics discussed in this section: ADSL ADSL Lite HDSL SDSL VDSL9.16
  17. 17. Note ADSL is an asymmetric communication technology designed for residential users; it is not suitable for businesses.9.17
  18. 18. Note The existing local loops can handle bandwidths up to 1.1 MHz.9.18
  19. 19. Note ADSL is an adaptive technology. The system uses a data rate based on the condition of the local loop line.9.19
  20. 20. Figure 9.10 Discrete multitone technique9.20
  21. 21. Figure 9.11 Bandwidth division in ADSL9.21
  22. 22. Figure 9.12 ADSL modem9.22
  23. 23. Figure 9.13 DSLAM9.23
  24. 24. Table 9.2 Summary of DSL technologies9.24
  25. 25. 9-4 CABLE TV NETWORKS The cable TV network started as a video service provider, but it has moved to the business of Internet access. In this section, we discuss cable TV networks per se; in Section 9.5 we discuss how this network can be used to provide high-speed access to the Internet. Topics discussed in this section: Traditional Cable Networks Hybrid Fiber-Coaxial (HFC) Network9.25
  26. 26. Figure 9.14 Traditional cable TV network9.26
  27. 27. Note Communication in the traditional cable TV network is unidirectional.9.27
  28. 28. Figure 9.15 Hybrid fiber-coaxial (HFC) network9.28
  29. 29. Note Communication in an HFC cable TV network can be bidirectional.9.29
  30. 30. 9-5 CABLE TV FOR DATA TRANSFER Cable companies are now competing with telephone companies for the residential customer who wants high-speed data transfer. In this section, we briefly discuss this technology. Topics discussed in this section: Bandwidth Sharing CM and CMTS Data Transmission Schemes: DOCSIS9.30
  31. 31. Figure 9.16 Division of coaxial cable band by CATV9.31
  32. 32. Note Downstream data are modulated using the 64-QAM modulation technique.9.32
  33. 33. Note The theoretical downstream data rate is 30 Mbps.9.33
  34. 34. Note Upstream data are modulated using the QPSK modulation technique.9.34
  35. 35. Note The theoretical upstream data rate is 12 Mbps.9.35
  36. 36. Figure 9.17 Cable modem (CM)9.36
  37. 37. Figure 9.18 Cable modem transmission system (CMTS)9.37
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