ATM Technology for Broadband Telecommunications Networks by Abhijit S. Pandya

By Abhijit S. Pandya

This textbook provides the entire most recent info on all features of every vital element of ATM - the most well liked telecommunications know-how of this decade. It demonstrates how ATM internetworks numerous incompatible telecommunications applied sciences and supply the high-speed, excessive bandwidth spine community that the full telecom is converging towards.

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Some of the key characteristics of these services are: high bandwidth demand, long service duration, bursty traffic patterns, varying quality of service requirements, and asymmetrical bandwidth usage. In this chapter, we will investigate some of these services such as Internet, Video on Demand, Video Telephony, Distant Learning/Medicine and Telecommuting, and explain how ATM can provide these services economically. Although some of these services we just mentioned are currently being offered through the existing public telephone network, they are too expensive to be afforded by the general public or there is not enough bandwidth available to fully utilize these services.

Hence, ATM is better suited for carrying video traffic. VOD traffic has very asymmetrical characteristics in terms of bandwidth use. Typically, the downstream traffic from the server to clients requires large bandwidth while the upstream traffic from the clients to server requires very small bandwidth for sending control information such as stop, start, pause, rewind, forward, etc. The STM technology requires equal bandwidth allocation in both directions whereas ATM allows different bandwidth allocation in both directions.

This is really an intermediate solution, because it requires multiple overlay networks. There are two possible ADSL deployment scenarios as depicted in Figure 3-4 and Figure 3-5. Figure 3-4 shows a case where the ADSL technology is integrated into the central office. Figure 3-5, on the other hand, shows a case where an external Digital Subscriber Line Multiplexer (DSLAM) is used to separate the Internet traffic from the traditional voice traffic. In this case, no upgrade is required for the existing central office.

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