10-CircuitandPacketSwitch

10-CircuitandPacketSwitch - William Stallings Data and...

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William Stallings Data and Computer Communications 8 th Edition Chapter 10 Circuit Switching and Packet Switching
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Switching Networks Long distance transmission is typically done  over a network of switched nodes Nodes not concerned with content of data End devices are stations Computer, terminal, phone, etc. A collection of nodes and connections is a  communications network Data routed by being switched from node to  node
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Nodes Nodes may connect to other nodes only, or to  stations and other nodes Node to node links usually multiplexed Network is usually partially connected Some redundant connections are desirable for  reliability Two different switching technologies Circuit switching Packet switching
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Simple Switched Network
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Circuit Switching Dedicated communication path between two  stations Three phases Establish Transfer Disconnect Must have switching capacity and channel  capacity to establish connection Must have intelligence to work out routing
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Circuit Switching - Applications Inefficient Channel capacity dedicated for duration of  connection If no data, capacity wasted Set up (connection) takes time Once connected, transfer is transparent Developed for voice traffic (phone)
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Public Circuit Switched Network
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Telecomms Components Subscriber Devices attached to network Subscriber line Local Loop Subscriber loop Connection to network Few km up to few tens of km Exchange Switching centers End office - supports subscribers Trunks Branches between exchanges Multiplexed
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Circuit Establishment
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Circuit Switch Elements
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Circuit Switching Concepts Digital Switch Provide transparent signal path between devices Network Interface Control Unit Establish connections
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10-CircuitandPacketSwitch - William Stallings Data and...

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