DCN_rpj22

DCN_rpj22 - 1 NT503: Data Communication &...

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Unformatted text preview: 1 NT503: Data Communication & Networking Asynchronous Transfer Mode (ATM) 2 Asynchronous Transfer Mode (ATM) ATM is a cell relay protocol designed by the ATM forum and adopted by the International Telecommunications Union - Telecommunications standardization sector (ITU-T) in early 1990s Information for multiple service types such as voice, video or data is conveyed in small, fixed size cells. Data rates: 155.52 Mbps (single-channel) and up to 622 Mbps (4-channels multiplexed together) Preferable transmission media is Fiber optic Used for high speed traffic between switched nodes spread over a large geo-graphical area, hence users are unaware of its existence 3 Why ATM ? The ATM has been designed based on the six challenges faced: The need for a transmission system to optimize the use of high-data-rate transmission media optical fiber The need for a system that can interface with the existing systems The inexpensive implementation low cost availability Support for the existing telecom hierarchies Accurate and predictable packet delivery connection oriented More functions to be implemented by hardware than software 4 Limitations of packet switched networks Packet switched networks: Larger packet sizes due to increased header size Co-existence of large packets (65,545 bytes) along with shorter packets (200 bytes) Variety of packet sizes makes traffic unpredictable The devices must incorporate elaborate software systems to manage various sizes of packets No consistency in data rate delivery 5 Multiplexing using different packet sizes Delay at the multiplexer due to packets having different sizes 6 Advantages of using fixed size cells No delay in multiplexing fixed size packets from different...
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DCN_rpj22 - 1 NT503: Data Communication &...

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