Screeching sounds are produced from the modem while it makes its first connection. The digital signals coming from the computer to which we are connecting being are modulated into these audible sounds. The modem sends a higher–pitched tone to represent the digit 1 and a lower–pitched tone to represent the digit 0.
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http://www.wonderwhizkids.com/index.php/modems
read more.....
http://www.wonderwhizkids.com/index.php/modems
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