Brief history of phone line

When the telephone was originally invented voice communication was established by connecting the telephones through wires. Telephones were originally connected directly together in pairs. Each user was required to establish separate telephones wired to the various places of contacts. It was found inconvenient when many people wanted to interact with each other since there was no flexibility.

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As the technology advanced, the telephone exchange was invented. A telephone exchange or telephone switch is a system of electronic components that connects telephone calls. Initially a number of local loops were formed by setting up a number of exchanges. Soon nearby exchanges were interconnected. Eventually far away places were connected by working out a network