Discussion Notes 4

Discussion Notes 4 - EE132B - Recitation 4 Switching...

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1 EE132B - Recitation 4 Switching Techniques Prof. Izhak Rubin rubin@ee.ucla.edu Electrical Engineering Department UCLA
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2 Switching Techniques Three types of switching techniques in telecommunications networks Circuit switching Message switching Packet switching
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3 Circuit Switching Circuit switching Users share communication facilities (circuits), but each user has a unique access to a circuit when it uses the network. Most common use: telephone networks Example Circuit switching for a communication from node A to node D A B C D
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4 Circuit Switching - 2 t c : connection setup delay t R : time to request / accept a link t o : time to find outgoing link t p : propagation delay per link (same for all sations) R: transmission rate D: total # of bits Total time of transmission: t c + t p + t R + t o + t p + t R + t o + t p +2t R +3t p + D/R A B C D Time Dialing and associated delays t c t R t p R e q u s t lin k t o t p t o t p C o n c t s ig a l 3t p Data transmission D (bits)/ R(bps)
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Circuit Switching - 3 Advantage Guaranteed capacity (no one else uses connection)
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Discussion Notes 4 - EE132B - Recitation 4 Switching...

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