What actually were those noises that dial-up modems made when connecting? What caused the noise?
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Simply put, those are the sounds of your modem and the modem at the other end ‘talking’ to eachother to establish standards and communication to make the internet data transfer work.
Each of those different ‘tones’ was a different part of the communication process.
[https://www.popularmechanics.com/science/a29611456/internet-dialup-modem-sounds/](https://www.popularmechanics.com/science/a29611456/internet-dialup-modem-sounds/)
It’s pretty well explained visual and audio here.
This video and image gives the sounds in great detail [https://www.youtube.com/watch?v=abapFJN6glo](https://www.youtube.com/watch?v=abapFJN6glo) [https://oona.windytan.com/posters/dialup-final.png](https://oona.windytan.com/posters/dialup-final.png)
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