So listen carefully to that song of the modem
A thread about the sounds dial-up modems used to make prompted member Devonian to recall being a fly on the wall during the development of modem speed standards:
I was lucky enough to have something of a ringside seat for this, as a friend was (possibly still is) a senior figure on the ITU committee that decided the v. standards for modems, and I followed developments closely between around 1990 and 2000 when a lot of the clever stuff was being agreed. (Being a rapporteur for an ITU committee is a good gig. You get diplomatic status, and access to the special diplomatic duty-free shops at airports. What, you didn't know about those?)