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Originally Posted by sjw
If you unlimit your upload, your download speed will plummet.
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This is not a specific issue with ntl, but more the way modems in general work. The modem has a buffer within it that it holds data in whilst it is being transmitted (either out over cable, or to your PC).
The bandwidth available for upload is in the region of KB/s, however your computer can pass data to the modem in the region of MB/s, so the buffer will get filled almost instantly. When download data arrives, the buffer is pretty full,so you don't get your maximum downstream rate.
Probably not explained perticularly well, but hopefully you get the idea.