BDC5eChapter12 - Chapter 12 Circuit Switching and Packet...

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Chapter 12: Circuit Switching and Packet Switching Business Data Communications, 5e
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Business Data Communications, 5e 2 Switching Techniques Data transmitted through a network of intermediate switching nodes, which are not concerned with content End devices receiving data are stations ; switching devices are nodes A collection of nodes is a communication network A switched communication network routes data from one station to another through nodes
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Business Data Communications, 5e 3 Switched Network Characteristics Some nodes connect only to other nodes for switching of data; other nodes have one or more stations attached as well. Node-station links are generally dedicated point- to-point links; ode-node links are usually multiplexed links Usually, the network is not fully connected; however, it is desirable to have more than one possible path through the network for each pair of stations to enhance reliability
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Business Data Communications, 5e 4 Types of Switched Networks Two different technologies Circuit switching Packet switching Differ in the way the nodes switch information from one link to another between source and destination
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Business Data Communications, 5e 5 Circuit-Switching Stages Circuit establishment Data transfer point-to-point from endpoints to node internal switching/multiplexing among nodes Circuit disconnect
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Business Data Communications, 5e 6 Circuit Establishment Station requests connection from node Node determines best route, sends message to next link Each subsequent node continues the establishment of a path Once nodes have established connection, test message is sent to determine if receiver is ready/able to accept message
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Business Data Communications, 5e 7 Data Transfer Point-to-point transfer from source to node Internal switching and multiplexed transfer from node to node Point-to-point transfer from node to receiver Usually a full-duplex connection throughout
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Business Data Communications, 5e 8 Circuit Disconnect When transfer is complete, one station initiates termination Signals must be propagated to all nodes used in transit in order to free up resources
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Business Data Communications, 5e 9 Circuit Switching Characteristics Channel capacity is dedicated for the duration of a connection, even if no data
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This note was uploaded on 04/27/2010 for the course BAMU BSC taught by Professor Kmm during the Spring '10 term at University of New York in Prague.

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BDC5eChapter12 - Chapter 12 Circuit Switching and Packet...

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