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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

High-SpeedDigital 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:

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


Note:

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



Figure 9.3ADSL modem



9.2 Cable Modem

Traditional Cable Networks

HFC Network

Sharing

CM and CMTS

DOCSIS


Figure 9.5Traditional cable TV network


Note:

Communication in the traditional cable TV network is unidirectional.


Figure 9.6HFC network


Note:

Communication in an HFC cable TV network can be bidirectional.


Figure 9.7Coaxial cable bands


Note:

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


Note:

The theoretical downstream data rate is 30 Mbps.


Note:

Upstream data are modulated using the QPSK modulation technique.


Note:

The theoretical upstream data rate is 12 Mbps.


Figure 9.8Cable modem



9.3 SONET

SONET Devices

SONET Frame

Frame Transmission

Synchronous Transport Signals

STS-1

Virtual Tributaries

Higher-Rate Service


Note:

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


Figure 9.10A SONET


Figure 9.11Frame format



Figure 9.12Data rate


Figure 9.13VT types


Figure 9.14STS multiplexing


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