Iirc, most copper lines had a 50kb cap, making 56kb modems liars.
I can't prove this but I somehow remember peaks of up to 48 kilobits per second though never sustained.
I remember being amazed to see download resume right in the browser even as late as 2009 (I was only on dial up u til about 2006).
IIRC limit isn't the copper, it's the CO interconnects with high/low frequency cutoffs, the same copper was used for 1.5Mbps synchronous DSL. For very short runs, 50Mbps VDSL
I can't prove this but I somehow remember peaks of up to 48 kilobits per second though never sustained.
I remember being amazed to see download resume right in the browser even as late as 2009 (I was only on dial up u til about 2006).
IIRC limit isn't the copper, it's the CO interconnects with high/low frequency cutoffs, the same copper was used for 1.5Mbps synchronous DSL. For very short runs, 50Mbps VDSL