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Download PDF by James H. Green: Access Technologies: DSL and Cable

By James H. Green

ISBN-10: 007138247X

ISBN-13: 9780071382472

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Additional info for Access Technologies: DSL and Cable

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5 Mbps downstream over a range of up to 18,000 ft (5,500 m). Data Digital Subscriber Line Access Technology 59 travels much more slowly in the upstream direction—in the 64- to 640-kbps range. For residential Web surfing, ADSL is an excellent alternative because the nature of the application is asymmetric. Many business applications require symmetrical bandwidth, however, so ADSL may not be adaptable in many cases. ADSL is most attractive for casual users, while SDSL is the most effective for businesses and telecommuters.

ATM is the most common protocol. With 5 bytes of header per cell, the overhead is approximately 10 percent. Equipment vendors claim from 16 to 20 voice channels per DSL line, but of course that depends on the actual data rate the line can sustain and also on the amount of bandwidth needed for data.

Splices deteriorate in time, and as a result the Serving Area Interface Distribution Cable Feeder Cables Central Office Serving Area Interface Distribution Cable Subscriber Drops Figure 3-1 Telephone Cable Plant Subscriber Drops 40 Access Technologies: DSL and Cable cable is incapable of carrying high-bandwidth signals. Wire is carefully twisted to reduce crosstalk between pairs. Cable pairs are formed into 50-pair complements. Copper cable provides a DC path from the subscriber to the CO. The CO feeds −48 V of DC toward the subscriber.

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Access Technologies: DSL and Cable by James H. Green


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