Evelyn, the reason that you cannot match your upload and dld speeds (if you mean that your upload speed doesn't get anywhere near your dld speed) is because:
-Dld and upload bandwidths use separate "slots" in cable connections
-the upload bandwidth "slot" is typically only a fragment of the dld "slot".
Check my signature. For a connection of over 2Megs of dld bandidth, I only have a measly 128Kb upload bandwidth. And what's even weirder is, before I upgraded from 1Meg to 2Megs, my upload bandwidth was actually greater...

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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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