3 ms·I suspect there are a few of us on here that started out with a 300 baud acoustic coupler modem...by jbuzbee 9y agoI suspect there are a few of us on here that started out with a 300 baud acoustic coupler modem...dmd 9y ago110 baud, here.wpietri 9y agoAh yes! Bit rates so low you could try to whistle them.