said by TheOptimus:
you have mention some different between kB and kb. i don't understand it ?
Small "b" in kb = kilobit
Big "B" in kB = kiloByte
There is a difference. Big difference.
1 kilobit = 0.125 kiloBytes.
600kb/s (as you wrote it) = 75kB/s
Bells throttle is about 240kb/s = 30kB/s
Small b and big B is very significant when you ask questions and think you have problems with DSL.
In either case, you should see lots more than 600kb/s (as what you stated).
Google, "convert bits to bytes".Also. Some websites use a kilo as meaning 1024 to convert bits to bytes, and some use the kilo as being 1000 to convert bits to bytes.
Storage "kilo" has historically been 1024 (ie hard disk capacity)
You want to you 1000.
Even some ISP's confuse the two and count B/W usage with 1024 when it should be 1000... anyhow.