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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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slide1

Chapter 9

High-SpeedDigital Access:DSL,Cable Modem,

and SONET

slide2

9.1 DSL Technology

ADSL

Other DSL Technologies

slide3

Note:

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

slide4

Note:

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

slide5

Note:

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

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9.2 Cable Modem

Traditional Cable Networks

HFC Network

Sharing

CM and CMTS

DOCSIS

slide11

Note:

Communication in the traditional cable TV network is unidirectional.

slide13

Note:

Communication in an HFC cable TV network can be bidirectional.

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Note:

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

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Note:

The theoretical downstream data rate is 30 Mbps.

slide17

Note:

Upstream data are modulated using the QPSK modulation technique.

slide18

Note:

The theoretical upstream data rate is 12 Mbps.

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9.3 SONET

SONET Devices

SONET Frame

Frame Transmission

Synchronous Transport Signals

STS-1

Virtual Tributaries

Higher-Rate Service

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Note:

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

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