I have the 20,127/893 Kbps service through CenturyLink DSL. I've ran speed test and it typically reports speeds close to that.
Except whenever I upload something substantial. Like a video file to YouTube. The upload takes forever, which I understand because of the 893 Kbps upload speed, but the entire time it is uploading the download speed grinds to a halt. It is so bad I cannot even connect to SpeedTest.net to do a speed test. The networking between other computers in the house is fine. But as long as one computer is uploading, all the computers might as well be kicked off the internet. For example, pinging Google takes 5 seconds to resolve the DNS and then the requests time out.
I called CenturyLink's support and talked to them for an hour and they said everything is fine. They had me reboot my computer and modem a few times, which of course didn't help. Finally they sent me a new (refurbished) modem to get me off the phone. It behaves the same.
So my question is if this behavior is typical of CenturyLink DSL or if something is really screwed up. Perhaps there is something I can do it fix it without spending another hour rebooting my modem while I am talking to an inept support person.