What is ISDN?
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Eli5 explanation: it is two 56k dial up modems bundled together. One of the modems does upload the other download. A traditional modem could only send datat one direction so it needed to wait to stop recieving then pause to make sure before sending. Combining the two more than doubled the true transfer speed and is considered the first high speed modem.
Fun fact, scott Adam’s the creator of Dilbert cartoons was one of the engineers that worked on the isdn lines creation.
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