Public switched telephone network

Public Switched Telephone Network is usually abbreviated to PSTN

The public switched telephone network is a world wide communication system consisting of copper telephone lines, fibre-optic cables, microwave towers, satellite systems and undersea cables.

A telephone call is routed to its destination by one or more switching centres.

It includes mobile telephones as well - they too are routed through to a PSTN switching center.

It was once a purely analogue system but it is now almost all digital with fibre-optic cables carrying the heaviest traffic such as between continents.

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Click on this link: PSTN


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