1 MiB/s = 1024 KiB/s and 1 MB/s is definitely 1000 kB/s. Ages ago they used k and K to differentiate between 1000 and 1024 but using that now is too confusing, still I tend to use kB instead of KB anyway. Nowadays you use the 'i' in the middle for the 1024, aka binary, hence it's called kiBIbyte instead of kilobyte.
1MB/s = 1024 KB/s
I was 12 years old when I had a dial up connection I had to reconnect every 2 hours, I wonder if every dial-up connection disconnect after 2 hours?
Also Micro$oft wrongly uses MB as if they were MiB in their Windows OS'es. They simply love to ignore all standardizations. Might be to keep the consistency in their products though.
I never had this 2 hour disconnection issue with my dial-up. Thought it's probably a safety mechanism so you don't accidentally leave your phone line open all day so you're unreachable and get crazy bills at the end of the month.