Asynchronous Transfer Mode for Transmitting Information Essay

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ATM is called Asynchronous Transfer Mode. ATM is a networking technology which transmits information in the form fixed cells. The main vision behind designing ATM was integration of services and performance requirements of both telephony and data networking which was shortly called Broadband Integrated Service Vision (B-ISDN). This cell relay protocol was designed by ATM forum and was universally adopted by ITU-T. Usually the size of the fixed cells is about 53 bytes with 5 bytes for header and 48 bytes payload. When compared to the cell sizes used in the previous technologies, the size of an ATM is small. The smaller size of the ATM cells gives us a major advantage. ATM enables us to transmit video, audio and data over the same network …show more content…

This should be done without any degradation in the performance or without requiring any replacement. 3. The design must be implemented in a less expensive method. In case the ATM becomes the backbone of the international communications the cost of implementing it should not be a major barrier. 4. The proposed system must ensure accurate and predictable delivery. This is possible only if ATM is a Connection-Oriented system. 5. The major objective of ATM was to move most of the functionalities to the hardware side and have comparatively less functionalities in the software. This will ensure higher speed in the delivery of packets. It is clear from the above points that the major goal of ATM was to ensure guaranteed Quality of Service (QoS). To ensure this various service classes were defined by the ATM forum like Constant Bit-Rate, Real time Variable Bit-Rate, Non Real time Variable Bit-Rate, Unspecified Bit-Rate, Available Bit-Rate. ARCHITECTURE OF ATM NETWORKS The ATM is a cell-switched network as discussed previously. There are two important interfaces which acts as a backbone to the whole architecture of ATM. The first is Network-to-Network interface (NNI) and the other is the User-to-Network interface (UNI). The User-to-Network interface is used to connect the User access devices or the end points to the switches, while the Network-to-Network interface is used to connect various switches. The connection between two end

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