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Chapter 14 Switching Circuit Switching Packet Switching Message Switching WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
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Figure 14-1 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switched Network
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Figure 14-2 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
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Figure 14-3 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Circuit-Switched Network
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Figure 14-4 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switch
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Figure 14-5 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Folded Switch
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Figure 14-6 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
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Figure 14-7 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Crossbar Switch
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How many crosspoints are needed in a single-stage switch with 40 inputs and 50 outputs? a.40 b.50 c.90 d.2000
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Figure 14-8 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Multistage Switch
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Figure 14-9 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switching Path
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Figure 14-9-continued WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switching Path
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Comparison 15-by-15 single stage crossbar –Needs ? crosspoints 15-by-15 multistage crossbar –Needs ? crosspoints
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Comparison 15-by-15 single stage crossbar –Needs 225 crosspoints 15-by-15 multistage crossbar –Needs 78 crosspoints (30+18+30). Three first stage switches, each with 10 crosspoints(5*2), for a total of 30 crosspoints. Two second stage switches, each with 9 crosspoints(3*3), for a total of 18 crosspoints. Three third stage switches, each with 10 crosspoints(5*2), for a total of 30 crosspoints.
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Figure 14-10 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 TDM without TSI (Time slot Interchange
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Figure 14-10-continued WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 TDM with TSI
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Figure 14-11 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Time-Slot Interchange
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SPACE-AND TIME-DIVISION SWITCHING COMBINATIONS
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Figure 14-12 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 TST Switch
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Figure 14-13 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
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Figure 14-14 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Datagram Approach
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Figure 14-15 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Datagram Approach, Multiple Channels
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VIRTUAL CIRCUIT APPROACH
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1.SWITCHED VIRTUAL CIRCUIT 2.PERMANENT VIRTUAL CIRCUIT
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Figure 14-16 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit
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Figure 14-16-continued WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit
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Figure 14-16-continued WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit
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Permanent virtual circuits Permanent connection for the duration of the lease
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Figure 14-17 WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998 Message Switching
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