Connection speeds are measured in "bits," and download speeds are measured in "bytes." Don't ask me why, it's just the way it is! hehehe.
One byte = 8 bits.
So take your 56K and divide it by 8, and that's your top download speed.
GO here: http://www.computingcentral.com/topi...eedtest500.asp
test your bandwidth, it'll give you a read on connection speed, and top download speed for you connection at that given moment. Right now, mine reads:
Your line speed: