Originally Posted by
Uplinker
Just a general point - and I don't know if it applies here, but "square wave DC" could describe a series of +270 Volts "Direct Current" pulses, with an equal mark space ratio. In other words, the voltage is switched on/off/on/off etc. between +270VDC and zero volts.
According to the diagram TURIN posted, the waveform is +/-270V symmetrical around zero, (rather than 0 to +270) so wouldn't that qualify is as AC under your distinction?