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Showing posts from July 29, 2010

ASYNCHRONOUS TRANSFER MODE

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ATM – definition: A transfer mode in which information is organized into cells; it is asynchronous in the sense that the recurrence of cells containing information from an individual user is not necessarily periodic". OR High-speed transfer technology for voice, video, and data over public networks. ATM VS X.25 —   As the speed and number of local area networks (LANs) continue their relentless growth, increasing demand is place on wide area packet-switching networks to support the tremendous throughput generated by these LANs. —    X.25 was designed to support direct connection of terminals and computers over long distances. —   X.25 packets may be of varying length, whereas ATM packets are of fixed size. —   X.25, with its substantial overhead, is being recognized as an inadequate tool for wide area networking. ATM VS FRAME RELAY —   ATM is normally utilized for high bandwidths of 34 Mbps and upwards. —   At speeds of 2 Mbps and below, Frame Relay is more bandwidth effi