CS606 FINAL TERM SOLVED PAPERS
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To accomplish its goals, ATM uses small, fixed-size packets called cells. Each cell has 53 octets. The VPI/VCI fields identify the target cells. PRIO checks if the cell can be discarded CRC only checks the header bits. ATM header
is about 10% of the cell. Ethernet can only have an overhead of 1%. Engineers sometimes call the ATM overhead a cell tax. The ATM is shown below.
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The connection-oriented services paradigm for networks is similar to the way phones are used. This is given as follows: The caller dials the destination number. The phone signals at the destination the arrival of a connection request. If the called person does not answer; the caller gives only after waiting for a time limit. If the called party answers, the connection is made established.
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Connections in ATMs are called virtual channels (VC) or virtual circuits (a term some prefer). These are called virtual because the connections are formed in ATM using initial values in memory locations (tables) in ATM switches as opposed to creating an actual electrical connections.
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A VC is identified by a 24-bit value created from the VPI or Virtual Path Indicator (8- bit) that identifies a specific network and VCI or virtual path A channel indicator (16 bits) identifies the channel in the virtual path that uses a connection. Most often, the 24-bit pair is treated as a single connection identifier computer.