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Lecture 5 - Switching (Packet Switching (Datagram Packet Switching (each…
Lecture 5 - Switching
Packet Switching
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each packet contains a header with control information (priority codes, source and destination addresses)
a series of packet switches route packets along different paths as they travel from source to destination
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Space-division Switches
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Crossbar Switch - connects n inputs to m outputs in a grid, using transistors at each cross point
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Circuit Switching
network is made of a set of switches connected by physical links, in which each link is divided into n channels
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resources need to be reserved during the set up phase and remain dedicated for the entire duration of data transfer
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Time-division switches
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disadvantage - processing each connection creates delays. Time slots must be stored in RAM, then retrieved and passed on.
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allows temporary dedicated connections to be established, maintained and terminated between end devices