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That is possible. Hitting the refresh/reload button in your browser would tell you immediately.
Firstly, if you haven't already tried it, follow my original suggestion. Plug your extension lead straight into the socket downstairs, no filter, no adapter, nothing. Check your phone works ok upstairs, if so plug the modem into the adsl socket of your extension and see what happens.
If you get nowhere, there seem to me to be three possible problems
1) There is something wrong with, or complete lack of, adsl on your line
2) There is something wrong with your extension lead/filter
3) There is something wrong with your modem/software
I'd say 2) is the least likely, if your phone's working. 1) you could probably get your ISP to check for you. Also there is at least one site which can tell you whether there's an adsl marker on your line or not, but I can't put my finger on it. 3) probably needs someone with a bit of knowledge. Someone on the forums here might be able to do it for you, otherwise you may just have to get a man in.
Sorry I can't be of more help.
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