Oh. 300 baud means a phone modem's speed (basically 300 bits/second) for the OLD old accoustical couplers, think 1970s 'net speeds i.e. you REALLY want broadband instead! Most of my post was to tease DougGuy right back, computer related knowledge that's obsolete, a lot, here.
https://en.wikipedia.org/wiki/Acoustic_coupler if curious, though.
There are tons of "Old technology" rabbit holes I can send you down, if you REALLY want to learn things that you will probably never find a practical use for. I'm pretty sure others here can do the same! You really might want to go for info you need now, though