O explicatie a sunetelor emise de un modem dial up
[The dial-up sounds are] a choreographed sequence that allowed these digital devices to piggyback on an analog telephone network. A phone line carries only the small range of frequencies in which most human conversation takes place: about three hundred to three thousand hertz. The modem works within these [telephone network] limits in creating sound waves to carry data across phone lines. What you’re hearing is the way 20th century technology tunneled through a 19th century network; what you’re hearing is how a network designed to send the noises made by your muscles as they pushed around air came to transmit anything [that can be] coded in zeroes and ones.
-Alexis Madrigal, paraphrasing Glenn Fleishman