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Integrated Services Digital Network

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 From Wikipedia - Reading time: 1 min
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The Integrated Services Digital Network is an evolution of the Public Switched Telephone Network that builds upon the latter's digitisation in order to offer enriched functionality.

For more information, see Integrated Services Digital Network.
Licensed under CC BY-SA 3.0 | Source: https://en.wikipedia.org/wiki/Category:Integrated_Services_Digital_Network
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