Lecture%20slides%202007%2002%2015

Lecture%20slides%202007%2002%2015 - Chapter 7...

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Chapter 7 Packet-Switching Networks Datagrams and Virtual Circuits
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The Switching Function z Dynamic interconnection of inputs to outputs z Enables dynamic sharing of transmission resource z Two fundamental approaches: z Connectionless z Connection-Oriented: Call setup control, Connection control Backbone Network Access Network Switch
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Packet switch Network Transmission line User Packet Switching Network Packet switching network z Transfers packets between users z Transmission lines + packet switches (routers) z Origin in message switching Two modes of operation: z Connectionless z Virtual Circuit
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z Message switching invented for telegraphy z Entire messages multiplexed onto shared z Headers for source & destination addresses z Routing at message switches z Connectionless Switches Message Destination Source Message Message Message Message Switching
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t t t t Delay Source Destination T τ Minimum delay = 3 τ + 3 T Switch 1 Switch 2 Message Switching Delay Additional queueing delays possible at each link
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Long Messages vs. Packets z Approach 1: send 1 Mbit message z Probability message arrives correctly z On average it takes about 3 transmissions/hop z Total # bits transmitted 6 Mbits 1 Mbit message source dest BER=p=10 -6 BER=10 -6 How many bits need to be transmitted to deliver message? z
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Lecture%20slides%202007%2002%2015 - Chapter 7...

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