56 kilobits (Kb) / 8 = 7 kilobytes (KB) of data per second. That is assuming both ends are connected at maximum capability.
In addition to that if you have a modem capable of compression you can effectively get higher transfer rates. Assuming you are transferring a text file that is capable of being compressed to half it's size (most text files compress much smaller than this) you will in effect get 14KB/s when you transfer that text file. Now compression will do you no good when transferring files that are already compressed (*.zip, *.gz, etc) because compressed files can not be compressed any more than they are.
Obviously there are other factors that will not allow the maximum connect speeds (shitty equipment, phone lines, running Windows, dropped packets, latency, etc) so you likely will only get 5 or 6KB/s max on a good connection when transferring *.zip, *.gz, or other compressed files.
[ October 01, 2002: Message edited by: void main ]