By Abhijit S. Pandya
This textbook offers the entire most up-to-date info on all elements of every very important part of ATM - the most well liked telecommunications expertise of this decade. It demonstrates how ATM internetworks a number of incompatible telecommunications applied sciences and supply the high-speed, excessive bandwidth spine community that the total telecom is converging towards.
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Additional info for ATM Technology for Broadband Telecommunications Networks
Figure 2-14 Algorithm for call setup request. Figure 2-15 Connection set up between two end systems through ATM signaling. Figure 2-15 illustrates how a call setup through the ATM works. First a request is signaled by end-user A to connect to end-user B. This request is routed through intermediate connections establishing a set up path. At that point the call request is accepted or denied by end-user B. If it is accepted, then the data flows along the same path. Finally the connection is torn down.
Despite these obvious business drivers there are a number of significant technical challenges posed by SVCs, especially in the area of signaling and routing. Information for connection control, traffic management and carrier-specific service features must be transferred between exchanges using signaling. The successful integration of high speed ATM networks with the various legacy data and telephone networks will place high demands on signaling throughout the ATM network. Routing is also critical for traffic control and will play an important role in protecting against traffic overload in SVCenabled ATM networks.
Once the route is determined, the ATM node updates these fields for the next ATM node in the path. The Payload Type (PT) field identifies the cell as containing user data, signaling data or maintenance information. The Cell Loss Priority (CLP) field indicates whether the cell is a high-priority or a low-priority cell. This field is used for congestion control purposes and allows the congestion control mechanism to identify low-priority cells to be discarded during congestion periods. Figure 2-5 ATM cell format at (a) UNI and (b) NNI.
ATM Technology for Broadband Telecommunications Networks by Abhijit S. Pandya