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

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., 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

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 ( ). 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 WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 TDM without TSI (Time slot Interchange

Figure continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 TDM with TSI

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Time-Slot Interchange

SPACE-AND TIME-DIVISION SWITCHING COMBINATIONS

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 TST Switch

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Datagram Approach

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Datagram Approach, Multiple Channels

VIRTUAL CIRCUIT APPROACH

1.SWITCHED VIRTUAL CIRCUIT 2.PERMANENT VIRTUAL CIRCUIT

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit

Figure continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit

Figure continued WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Switched Virtual Circuit

Permanent virtual circuits Permanent connection for the duration of the lease

Figure WCB/McGraw-Hill  The McGraw-Hill Companies, Inc., 1998 Message Switching