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Why do they use 4khz bandwidth for switched telephone network?

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What the reason behind choosing specifically 4kHz?

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  1. ttp://totalanswer.showbox.ca

    you can get much information in this website,stay a minute in website and check anyone link at a time,you can aslo get your answer in Google Search in this website, which has helped me alot


  2. That is enough to support speech and when they started that is all they cared about.

    Now once they get to the manhole they allocate 64Kbps digital for each channel with 8K used for ones density the user can have 56Kbps.
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