ISDN Used to be the "Next Generation Network"

Some of us can remember when ISDN was the "next generation network." Then we shifted to broadband ISDN (Asynchronous Transfer Mode). Then the Internet hit. Now the next generation network is built on Internet Protocol. 

 That wasn't the way network architects in the telecom world expected matters to unfold. 

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source: Arris


source: Arris
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