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Chapter 14
Switching
• Circuit Switching
• Packet Switching
• Message Switching
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Figure 14-1
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switched Network
Figure 14-2
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Figure 14-3
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Circuit-Switched Network
Figure 14-4
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switch
Figure 14-5
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Folded Switch
Figure 14-6
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Figure 14-7
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Crossbar Switch
Figure 14-8
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Multistage Switch
Figure 14-9
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switching Path
Figure 14-9-continued
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switching Path
Figure 14-10
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
TDM without TSI
Figure 14-10-continued
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
TDM with TSI
Figure 14-11
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Time-Slot Interchange
Modified by Dr Perry Xiao, LSBU, 2003
Space-Division Switching• Advantages
Instantaneous
• Disadvantages
Number of crosspoints required
Time -Division Switching• Advantages
No crosspoints needed
• Disadvantages
Delays
Space- and Time-Division Comparison
Figure 14-12
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
TST Switch
Figure 14-13
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Figure 14-14
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Datagram Approach
Figure 14-15
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Datagram Approach, Multiple Channels
Figure 14-16
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switched Virtual Circuit
Figure 14-16-continued
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switched Virtual Circuit
Figure 14-16-continued
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Switched Virtual Circuit
Figure 14-17
WCB/McGraw-Hill The McGraw-Hill Companies, Inc., 1998
Message Switching