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Slide1: 

Chapter 9 High-Speed Digital Access: DSL, Cable Modem, and SONET

Slide2: 

9.1 DSL Technology ADSL Other DSL Technologies

Slide3: 

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

Slide4: 

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

Slide5: 

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

Slide6: 

Figure 9.1 DMT

Slide7: 

Figure 9.2 Bandwidth division

Slide8: 

Figure 9.3 ADSL modem

Slide9: 

Figure 9.4 DSLAM

Slide10: 

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

Slide11: 

Figure 9.5 Traditional cable TV network

Slide12: 

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

Slide13: 

Figure 9.6 HFC network

Slide14: 

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

Slide15: 

Figure 9.7 Coaxial cable bands

Slide16: 

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

Slide17: 

The theoretical downstream data rate is 30 Mbps. Note:

Slide18: 

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

Slide19: 

The theoretical upstream data rate is 12 Mbps. Note:

Slide20: 

Figure 9.8 Cable modem

Slide21: 

Figure 9.9 CMTS

Slide22: 

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

Slide23: 

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

Slide24: 

Figure 9.10 A SONET

Slide25: 

Figure 9.11 Frame format

Slide26: 

Table 9.1 SONET rates

Slide27: 

Figure 9.12 Data rate

Slide28: 

Figure 9.13 VT types

Slide29: 

Figure 9.14 STS multiplexing