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bandwidth access solution for a variety of applications. The most common DSL services are ADSL, ADSL2 , HDSL, HDSL-2, RADSL, and VDSL. The special case of G.lite, a form of ADSL, will also be discussed.
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When the World Wide Web and flat-rate access charges arrived, the typical consumer phone call went from roughly four minutes in duration to several times that. All the engineering that led to the overall design of the network based on an average four-minute hold time went out the window as the switches staggered under the added load. Never was the expression, In its success lies the seeds of its own destruction, more true. When ADSL arrived, it provided the offload required to save the network. The typical ADSL installation is shown in Figure 6-4. No change is required to the two-wire local loop; however, minor equipment changes are required. First, the customer must have an ADSL modem at their premises. This device allows both the telephone service and a data access device, such as a PC, to be connected to the line. The ADSL modem is more than a simple modem, in that it also provides the frequency-division multiplexing process required to separate the voice and data traffic for transport across the loop. The device that actually does this is called a splitter, in that it splits the voice traffic away from the data. It is usually bundled as part of the ADSL modem although it can also be installed as a card in the PC, as a stand-alone device at the demarcation point, or on each phone at the premises. The most common implementation is to integrate the splitter as part of the DSL modem; this, however, is the least desirable implementation because this design can lead to crosstalk between the voice and data circuitry inside the
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Figure 6-4 Layout of typical Digital Subscriber Line (DSL)
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Access Technologies
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device. When voice traffic reaches the ADSL modem, it is immediately encoded in the traditional voice band and handed off to the local switch when it arrives at the central office. The modem is often referred to as an ADSL transmission unit for remote use, or ATU-R. Similarly, the device in the central office often called an ATU-C (for central office ). When a PC wishes to transmit data across the local loop, the traffic is encoded in the higher frequency band reserved for data traffic. The ADSL modem knows to do this because the traffic is arriving on a port reserved for data devices. Upon arrival at the CO, the data traffic does not travel to the local switch; instead, it stops at the ADSL modem that has been installed at the CO end of the circuit. In this case, the device is actually a bank of modems that serves a large number of subscribers, and is known as a Digital Subscriber Line Access Multiplexer, or DSLAM (pronounced dee-slam ). A rack of DSLAMs is shown in Figure 6-5. Instead of traveling on to the local switch, the data traffic is now passed around the switch to a router, which in turn is connected to the Internet. This process is known as a line-side redirect. The advantages of this architecture are fairly obvious. First, the redirect offloads the data traffic from the local switch so that it can go back to doing what it does best switching voice traffic. Second, it creates a new line of business for the service provider. As a result of adding the router and connecting the router to the Internet, the service provider instantly becomes an ISP. This is a near-ideal combination, because it allows the service provider to become a true service provider by offering much more than simple access and transport.
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