Recently I have changed my modem to it Zyxel HN 660 F1 but the problem is that ADSL light on but red light on connection but it is not providing internet connection. Well then I turn off the modem, I check all the plugs, will see in the upstairs neighbor (same ISP) at home OK, no problem. An hour after I put the modem on the check, still red on the Internet. I reset and re-installation, by doing this indication. No connection till and I have no idea why this is happening.