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A fax machine uses the same frequencies that an analog telephone uses - Ah, perfect! That is the key idea I was looking for. I assumed since more data is transmitted in a fax, it would use those higher frequencies as well.
– IQAndreas
Commented Aug 7, 2015 at 5:02
If you think that answers your question, please mark the answer as accepted. :-)
– Sebastian R.
Commented Aug 7, 2015 at 15:45

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like so
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