132B_1_Recitation4_Switching_Techniques

132B_1_Recitation4_Switching_Techniques - 1 EE132B -...

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Unformatted text preview: 1 EE132B - Recitation 4 Switching Techniques Prof. Izhak Rubin rubin@ee.ucla.edu Electrical Engineering Department UCLA 2 Switching Techniques Three types of switching techniques in telecommunications networks Circuit switching Message switching Packet switching 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 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 stations) 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 e s t lin k t o R e q u e s t lin k t p t o R e q u e s t lin k t p C o n n e c t s ig n a l 3t p Data transmission D (bits)/ R(bps) 5 Circuit Switching - 3 Advantage Guaranteed capacity (no one else uses connection) Disadvantage Circuit costs are fixed independent of use No priority Huge setup delays 6...
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132B_1_Recitation4_Switching_Techniques - 1 EE132B -...

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