This read-only INTEGER field is the 'voltage' property of the 'FexPsuInputStats' managed object in Cisco UCS Manager's equipment-inventory schema for the FEX (Fabric Extender) subsystem reporting the PSU's instantaneous AC/DC input voltage. This is the line voltage the PSU is actually seeing at its input right now, the figure to check first if a PSU starts throwing power faults, since a sagging or fluctuating input voltage is a common root cause. A Voltage reading of 208V is normal for a PSU wired to three-phase 208V facility power; a reading that has dropped to 180V would point to an upstream power-quality problem.