10 – 6
Chapter 10 Machine Overview
10.2 Telephone Call Connection Mechanism
10.2.1 Analog Telephone Network
To make a telephone call, the calling party and called party each must have a telephone set
(telephone). These telephones must be connected by a transmission route. The transmission route
includes switches located in central offices. The route itself comprises various components such as
metallic cable and optical cable. The entire transmission path between the two telephones is called an
analog telephone network.
An analog telephone network comprises the following four parts:
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Analog Telephone Network Configuration
Telephone set Telephone setSwitch Switch
Subscriber line Transmission route Subscriber line
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Switching Equipment Network
Telephone set
Telephone set
Telephone set
Telephone set
Local switch
Local switch
Local switch
Local switch
Tandem switch
Tandem switch
Tandem switch
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