eli5: The “handshake” between dial-up modems and why it made those sounds

Question

eli5: The “handshake” between dial-up modems and why it made those sounds

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Answer 1

Your modem needs to know what device it’s listening to, what frequency it’s listening to and if it’s even compatible. There’s a lot of instructions that go through connecting to the internet and the only way to transmit this through phone is sending the bits as a frequency, i guess they kept the actual listening part in to debug and see if anything goes wrong. People had to design this stuff at some point