Circuit Switching and Telephone Network

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Presentation transcript:

Circuit Switching and Telephone Network Chapter 8 Circuit Switching and Telephone Network

8.1 Circuit Switching Space-Division Switch Time-Division Switch TDM Bus Combinations

Figure 8.1 Circuit-switched network

Figure 8.2 A circuit switch

Figure 8.3 A folded switch

Figure 8.4 Crossbar switch

Figure 8.5 Multistage switch

Figure 8.6 Switching path

Figure 8.7 Time-division multiplexing, without and with a time-slot interchange

Figure 8.8 Time-slot interchange

Figure 8.9 TDM bus

Figure 8.10 TST switch

8.2 Telephone Network Major Components LATAs Making a Connection Analog Services Digital Services A Brief History

Figure 8.11 A telephone system

Note: Intra-LATA services are provided by local exchange carriers. Since 1996, there are two types of LECs: incumbent local exchange carriers and competitive local exchange carriers.

Figure 8.12 Switching offices in a LATA

Figure 8.13 POPs

Figure 8.14 Rotary and touch-tone dialing

Note: Voice communication used analog signals in the past, but is now moving to digital signals. On the other hand, dialing started with digital signals (rotary) and is now moving to analog signals (touch-tone).