... surge voltage, harmonic distortion, clutter immunity, and frequency fluctuation etc., delivering safe and reliable power ... N+X Parallel RedundancyTechnical specification for high frequency online UPS DX6K-DX3120KL: Online UPS MODELDX6KDX10KDX6KLDX10KLDX3110KLDX3115KLDX3120KLCAPACITYVA ... distance<55dB<60dBCommunicationsIntelligent RS232 serial portWindows 98/NT/2000/XP/2003, Linux, Sun Solaris, IBM Aix ...