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

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4_SWITCHING.pptx.pdf