What does it mean when the USB light on the modem is not lit, but the modem is connected to the computer via the USB cable?
This means that the USB drivers for the modem are not loaded and should be checked under the System properties: Control Panel => System => Device Manager => Network Adapters => look for the Westell WireSpeed Dual Connect Modem. If you are using Windows2000 or Windows XP then you would check by Control Panel => System => Hardware => Device Manager => Network Adapters => look for the Westell WireSpeed Dual Connect Modem.