Chapter 9
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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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Chapter 9

Chapter 9

High-SpeedDigital Access:DSL,Cable Modem,

and SONET


Chapter 9

9.1 DSL Technology

ADSL

Other DSL Technologies


Chapter 9

Note:

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


Chapter 9

Note:

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


Chapter 9

Note:

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


Chapter 9

Figure 9.1DMT


Chapter 9

Figure 9.3ADSL modem


Chapter 9

Figure 9.4DSLAM


Chapter 9

9.2 Cable Modem

Traditional Cable Networks

HFC Network

Sharing

CM and CMTS

DOCSIS


Chapter 9

Figure 9.5Traditional cable TV network


Chapter 9

Note:

Communication in the traditional cable TV network is unidirectional.


Chapter 9

Figure 9.6HFC network


Chapter 9

Note:

Communication in an HFC cable TV network can be bidirectional.


Chapter 9

Figure 9.7Coaxial cable bands


Chapter 9

Note:

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


Chapter 9

Note:

The theoretical downstream data rate is 30 Mbps.


Chapter 9

Note:

Upstream data are modulated using the QPSK modulation technique.


Chapter 9

Note:

The theoretical upstream data rate is 12 Mbps.


Chapter 9

Figure 9.8Cable modem


Chapter 9

Figure 9.9CMTS


Chapter 9

9.3 SONET

SONET Devices

SONET Frame

Frame Transmission

Synchronous Transport Signals

STS-1

Virtual Tributaries

Higher-Rate Service


Chapter 9

Note:

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


Chapter 9

Figure 9.10A SONET


Chapter 9

Figure 9.11Frame format


Chapter 9

Table 9.1 SONET rates


Chapter 9

Figure 9.12Data rate


Chapter 9

Figure 9.13VT types


Chapter 9

Figure 9.14STS multiplexing


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