A dual-thickness active device layer SOI chip structure is provided. The outer stator has a first multi-phase coil wound thereon so as to form magnetic poles upon energization of the first multi-phase coil. The method also includes replying with an answer message by the PA server to the PA client to provide a first prefix with a first lifetime. In regulating the pressure and flow pulses, the devices attenuate the noise generated by the pressure and flow pulses.