The History of DSL
The History of DSL
The frequency range of the human voice is from 300 to 3,400 Hz. The telephone companies liked limiting the bandwidth because it allowed them to bundle many wires together at a central location without having any distortion caused by overlapping frequencies.
That leaves a lot of unused bandwidth - more than a million HZ — on the copper wire, and that’s why engineers started looking at using it for proxy script in the first place.
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