well dude..i have checked with several inverters...right now i have got a pure sine wave inverter which gives me exact 220 V pure output...its a UPS/stabilizer Inverter, which itself works as a stabilizer for 220 V input for my PC (as said by my brother who manufactures inverters

).
Right now i have disconnected my power plug for inverter, so my pc is running on battery now... there is no disconnection now but when the entire areas electricity goes, internet led next to DSL lead starts blinking n i cant connect...