History Of The Telephone

Hello friends, today we are going to see the new invention in the technology of telephone

History

When Alexander graham Bell patented the telephone in 1876, there was an enormous demand for his new invention. People purchase the telephones which came in pairs.

If a telephone owner wanted to talk to another telephone owner, separate wires had to be strung to all n houses and the cities were covered with wires passing over houses and trees in a wild jumble as shown in figure (a). That was not going to work.

 Bell formed the Bell telephone company, which opened its first switching office in 1878. The company ran a wire to each customer’s house or office. To make call, the customer first ringing sound in the telephone company office to attract the attention of an operator, who would then manually connect the caller to the callee using a jumper cable. The model of a single switching office is in figure (b).

Then people wanted to make long distance calls between cities, so the bell system began to connect the switching offices. The original problem soon returned to connect every switching office to every other switching office with the wire, again it became unmanageable,  so multiple second-level offices were needed as shown in figure (c). The hierarchy grew to five levels.

(a) Fully interconnected network. (b)  Centralized switch. (c) Two level hierarchy



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