kb->kilobits
KB->KiloBytes
You may also see KiB which goes for Kibibytes, but that's another story (about decimals and stuff like that. Just stick to the "original" for now)
I suppose that what seems wrong to you is the fact that the upload speed (if 723 kb is indeed your upload speed) is greater than you download speed?

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

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