Telephone Call Connection Mechanism; Analog Telephone Network - Dell 2135cn Service Manual

2. Telephone Call Connection Mechanism

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:
Analog Telephone Network Configuration
Telephone set
Subscriber line
Switching Equipment Network
Telephone set
Local switch
Telephone set
Version 1 2008.02.01
Switch
Transmission route
Tandem switch
Tandem switch
Tandem switch
Local switch
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Chapter 6 Principle of Operation (Fax)
Switch
Subscriber line
Local switch
Telephone set
Local switch
Telephone set
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Telephone set
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