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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.

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Chapter 8

Circuit SwitchingandTelephone Network


8.1 Circuit Switching

Space-Division Switch

Time-Division Switch

TDM Bus

Combinations


Figure 8.1Circuit-switched network


Figure 8.2A circuit switch


Figure 8.3A folded switch


Figure 8.4Crossbar switch


Figure 8.5Multistage switch


Figure 8.6Switching path


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


Figure 8.8Time-slot interchange


Figure 8.9TDM bus


Figure 8.10TST switch


8.2 Telephone Network

Major Components

LATAs

Making a Connection

Analog Services

Digital Services

A Brief History


Figure 8.11A 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 8.12Switching offices in a LATA



Figure 8.14Rotary 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).


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