Telephone System

The telephone is a familiar end instrument in telecommunication switching system. The development of telephone and circuits started around midst 1850. The table 3.1 shows the development of telephone.

Table 3.1. Development of telephone

Year

Description

Early 1854

Charles Bourseul discovered the vibration due to speech waves on the sufficiently flexible disc. Also he found this vibration can made and brake current from a battery.

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