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High-Speed Digital Access: DSL, Cable Modem,

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Presentation on theme: "High-Speed Digital Access: DSL, Cable Modem,"— Presentation transcript:

1 High-Speed Digital Access: DSL, Cable Modem,
Chapter 9 High-Speed Digital 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 The existing local loops can handle bandwidths up to 1.1 MHz.
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 DMT

7 Figure 9.2 Bandwidth division

8 Figure ADSL modem

9 Figure DSLAM

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

11 Figure 9.5 Traditional cable TV network

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

13 Figure HFC network

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

15 Figure 9.7 Coaxial cable bands

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

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

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

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

20 Figure Cable modem

21 Figure CMTS

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

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

24 Figure A SONET

25 Figure Frame format

26 Table 9.1 SONET rates STS OC Rate (Mbps) SPE (Mbps) User (Mbps) STS-1
51.84 50.12 49.536 STS-3 OC-3 155.52 STS-9 OC-9 466.56 STS-12 OC-12 622.08 STS-18 OC-18 933.12 STS-24 OC-24 STS-36 OC-36 STS-48 OC-48 STS-192 OC-192

27 Figure Data rate

28 Figure VT types

29 Figure 9.14 STS multiplexing

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