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Figure 6-5 A bay of DSLAMs
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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.
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As the name implies, ADSL provides two-wire asymmetric service that is, the upstream bandwidth is different from the downstream. In the upstream direction, data rates vary from 16 to 640 Kbps, while the downstream bandwidth varies from 1.5 to 8 Mbps. Because most applications today are asymmetric in nature, this disparity poses no problem for the average consumer of the service.
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This device has received a significant amount of attention recently because of the central role that it plays in the deployment of broadband access services. Obviously, the DSLAM must interface with the local switch so that it can pass voice calls on to the PSTN. However, it often interfaces with a number of other devices as well. For example, on the customer side, the DSLAM may connect to a standard ATU-C, directly to a PC with a built-in NIC, to a variety of DSL services, or to an integrated access device of some kind. On the trunk side (facing the switch), the DSLAM may connect to IP routers as described before, to an ATM switch, or to some other broadband service provider. It therefore becomes the focal point for the provisioning of a wide variety of access methods and service types.
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ADSL2 is a newer standard that has superseded preexisting ADSL standards. It is interoperable with preexisting ADSL deployments and is critical for service providers and customer alike; it means that they can continue to use their installed base of equipment with minimal disruption.
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ADSL2 , on the other hand, is an extension of ADSL2. It is capable of doubling the transmission speed of typical ADSL installations to over 20 Mbps downstream on loops shorter than 8,000 feet.
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6
One major proponent of so-called Next-Generation DSL is BellSouth, which has the largest installed base of fiber among all the ILECs. The company believes that the best path to better residential broadband delivery is through faster DSL. Its strategy, which is a good one, is focused on scaling up existing DSL facilities with ADSL2 and using DSL bonding techniques to scale DSL bandwidth to as high as 24 Mbps high enough to support HDTV-quality video. Its plan is to implement ADSL2 , which will boost its available DSL bandwidth to 12 Mbps. Early next year the carrier also will test DSL bonding, which allows multiple DSL connections to be aggregated into a single virtual 24 Mbps channel. As far as applications are concerned, Bellsouth plans to test VoIP and will include a trial of Microsoft s IPTV platform.
High Bit Rate Digital Subscriber Line (HDSL)
The greatest promise of HDSL is that it provides a mechanism for the deployment of four-wire T1 and E1 circuits without the need for span repeaters, which can add significantly to the cost of deploying data services. It also means that service can be deployed in a matter of days rather than weeks, something customers certainly applaud. DSL technologies in general allow for repeaterless facilities as far as 12,000 feet, while traditional four-wire data circuits such as T1 and E1 require repeaters every 6,000 feet. Consequently, many telephone companies are now using HDSL behind the scenes as a way to deploy these traditional services. Customers do not realize that the T1 facility they are plugging their equipment into is being delivered using HDSL technology. The important thing is that they don t need to know. All the customer should have to care about is that there is now a SmartJack installed in the basement, and through that jack they have access to 1.544 Mbps or 2.048 Mbps of bandwidth period.
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