06. Switching

06. Switching - Switching 1 Introduction Single-hop...

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1 Switching
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 2 Introduction ± Single-hop networks: directly from source to destination ± Real networks: ² Not fully connected ² Multi-hop (data transported via a number of intermediate nodes) ² Switching is performed in intermediate nodes
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 3 The Concept of Switching ± Network wide ² Provide a source-destination channel ² Fixed delay and bandwidth Æ circuit switching ² Based-on statistical mux Æ packet switching ± With a node ² Setup a input-output match ² Static, semi-static match (controlled by signaling) Æ circuit switching ² Dynamic match (controlled by data overhead) Æ packet switching
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 4 Circuit Switching
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 5 Circuit Switching ± What is a circuit ² Dedicated to the terminals ² Fixed bandwidth and delay ² Can be physical connections, TDM slots, wavelength channel. ± Discussion: pros and cons?
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 6 Circuit Switching ± ² Good quality of service (QoS) ² Relatively low complexity ² Highly robust ± / ² Setup/release overhead ² Low bandwidth efficiency ² Scalability (large network with huge amount of circuits) ² Limited flexibility
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Communication Networks © Kang Xi, Polytechnic Institute of NYU 7 Typical Circuit Switching ± PSTN (Public switched telephone network) ² 64 kbps voice channels ± ISDN ² Designed to integrate multiple services, failed ² Used for internet access in 1990s
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Communication Networks © Kang Xi, Polytechnic Institute of NYU
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This note was uploaded on 11/02/2010 for the course EE 136 taught by Professor Kang xi during the Spring '10 term at NYU Poly.

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06. Switching - Switching 1 Introduction Single-hop...

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