Hi, I use UT 300R2U Modem from BSNL for broadband. I take lot of phone calls through Internet, primarily via Skype. One problem I have is that whenever there is powercut I get disconnected from the calls even though I have inverter at home, because the half minute or so delay that it takes for the inverter to restore power is enough for disconnecting me from the internet and the call and I need to call back once the modem gets power back from inverter. A friend advised me that instead of using the ethernet cable if I use the USB port of the UT 300R2U modem, the modem can draw power from the laptop for that brief half-minute of interruption and I would not get disconnected. Unfortunately when I tried that it is NOT working and the UT 300R2U modem still gets disconnected during power cut despite remaining connected to the USB port of my laptop! Is it because the power requirement of this external modem UT 300R2U is more than what USB ports of laptop can provide? Any advise anybody can provide me on this problem?

The answer is no. I have yet to find any broadband modem that is under the 2.5 to possibly 5 Watt capability of 1 or 2 USB ports.