Download e-book for iPad: Access technologies : DSL and cable by James H. Green

By James H. Green

ISBN-10: 007138247X

ISBN-13: 9780071382472

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Extra info for Access technologies : DSL and cable

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The use of one pair to serve one subscriber does not begin to use the bandwidth capacity of a cable pair. For short distances, plain copper wire is costeffective, but for longer subscriber loops or for large concentrations of loops into a single subscriber, multiplexing can increase the capacity. Therefore, the ILECs sometimes use multiplex equipment in the local loop. Several factors instigated this. One was the development of digital loop carrier (DLC), which allows the ILECs to extend subscriber lines to the outer reaches of the wire center using a system similar to T1/E1.

It is permanently burned into the network inter- Data Transmission Fundamentals 29 face card (NIC) as a unique 48-bit address. The IP address, on the other hand, can easily change. If the station moves from one segment to another, for example, the IP address changes, perhaps by as little as one digit. In addition, IP addresses are often assigned only as long as the computer is active. Most networks use a protocol known as Dynamic Host Configuration Protocol (DHCP) to assign IP addresses to station as they boot up.

The party line has gradually surrendered to the individual line, which relieves subscribers of the contention that once characterized the telephone system. Some of the vestiges of multiple plant remain, however, and have an adverse impact on high-frequency transmission. At the heart of the local telephone network is the wire center, which is the building in which copper cable and fiber extending to the subscriber terminate. Copper cable starts at a cross-connection point called a main disturbing frame (MDF).

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Access technologies : DSL and cable by James H. Green

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