This strikes me as a little strange. A router is normally used to provide an interface between an external network (the Internet) and your own internal network. However, from what I make of your connction, you are connecting to the Internet via a USB modem attached to a computer and the router is acting as a simple switch.
What router are you using ? Most new routers now come with a built in ADSL modem, and in this case you should plug the cable from the telephone line into the router rather than the USB modem. Obviously this will involve some configuration but the routers manual should be of some use.
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