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Introduction To Data Communications

Introduction to the PSTN


The Public Switched Telephone Network (PSTN) was designed to enable analogue (sound) communication between telephones. It is a well-established network with extensive infrastructure providing universal coverage.

PSTN is a circuit switched network. When a customer requests a service path, an electronic connection is established between their telephone connection and the local switching exchange (the local loop). The local exchange is interconnected to a network of main circuits and exchanges. When making a transmission each link in the network is dedicated to the connection for the duration of the transmission. Once the communication has been completed, the switching device releases the channel making it available for other communication sessions.

The PSTN is constantly being upgraded to increase the suitability to handle digital data more efficiently by introducing fibre optics and digital technology to work on packet switched basis. Connecti...

Posted by: Geraint Watts

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