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Access technologies, used to connect the customer to the network, come in a variety of forms and offer a broad variety of connectivity options and bandwidth levels. The key to success is to not be a bottleneck. Access technologies that can evolve to meet the growing customer demands for bandwidth will be the winners in the game. DSL holds an advantage as long as it can overcome the availability challenge and the technology challenge of loop carrier restrictions. Wireless is hobbled by licensing and spectrum availability, both of which are regulatory and legal in nature, rather than technology limitations. In 6, Transport Technologies, we will discuss transport technologies, including private line, Frame Relay, ATM, and optical networking.
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Source: Telecom Crash Course
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CHAPTER
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Transport Technologies
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Transport Technologies
6
We have now discussed the premises environment and access technologies. The next area we ll examine is transport. Because businesses are rarely housed in a single building, and because their customers are typically scattered across a broad geographical area (particularly multinational customers), a growing need exists for high-speed, reliable wide-area transport. Wide-area can take on a variety of meanings. For example, a company with multiple offices scattered across the metropolitan expanse of a large city requires interoffice connectivity in order to do business properly. On the other hand, a large multinational with offices and clients in Madrid, San Francisco, Hamburg, and Singapore requires connectivity to ensure that the offices can exchange information on a 24-hour basis. These requirements are satisfied through the proper deployment of wide-area transport technologies. These can be as simple as a dedicated private line circuit or as complex as a virtual installation that relies on Asynchronous Transfer Mode (ATM) for high-quality transport. Dedicated facilities are excellent solutions because they are dedicated. They provide fixed bandwidth that never varies and they guarantee the quality of the transmission service. Because they are dedicated, however, they suffer from two disadvantages. First, they are expensive and only cost-effective when highly utilized. The pricing model for dedicated circuits includes two components: the mileage of the circuit and the bandwidth. The longer the circuit, and the faster it is, the more it costs. Second, because they are not switched and are often not redundant because of cost, dedicated facilities pose the potential threat of a prolonged service outage should they fail. Nevertheless, dedicated circuits are popular for certain applications and are widely deployed. They include such solutions as T-1, which offers 1.544 Mbps of bandwidth; DS-3, which offers 44.736 Mbps of bandwidth; and the Synchronous Optical Network (SONET), which offers a wide range of bandwidth from 51.84 Mbps to as much as 40 Gbps. The alternative to a dedicated facility is a switched service, such as Frame Relay or ATM. These technologies provide virtual circuits. Instead of dedicating physical facilities, they dedicate logical timeslots to each customer who then shares access to physical network resources. In the case of Frame Relay, the service can provide bandwidth as high as DS-3, thus providing an ideal replacement technology for lower-speed dedicated circuits. ATM, on the other hand, operates hand-in-glove with SONET and is thus capable of providing transport services at gigabit speeds. Finally, the new field of optical networking is carving out a large niche for itself as a bandwidth-rich solution with the potential for inherent quality of service (QoS).
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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