Can you be more specific? I'm having trouble following you.
What I understand...
You have a DSL wireless router (I think you meant a router, bridges are for corporations) when you try to wirelessly connect, it disconnects. (What disconnects? the wireless client?). What exactly is happening? Is it connecting for a few seconds then disconnects, or is it not connecting at all?
First of all what type of router is it, is it namebrand (netgear, linksys, d-link etc...) or did it come with your DSL subscription? Please provide the model if you can. Is this new? has it worked before? etc.
The very first thing I would do (right after finding the make and model) is to go to the manufacteurs site and see if you have the latest version of the firmware. This is very important as many router connection problems are firmware related. Verify your version, upload a new one if need be and try again.
Keep me updated...