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5. INTRODUCTION TO THE TELEPHONE
NETWORK
We can talk to people over a long distance because we have an interlinked
telephone network which contains many telephone centers.
In this section, let's learn about the mechanism of a telephone network.
5.1
Parts of a Telephone Network
To communicate over a telephone line, you need two telephones, a tele-
phone line, and an exchange system. The telephone is sometimes called a
terminal, because it is at each end of the telephone line.
Telephone (Terminal)
Exchange system
Fig. 1-16 Parts of a Telephone Network
BASIC OF TELEPHONE
Telephone (Terminal)
Telephone line
1
2
3
4
5
6
ït
çi
1–15
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