This read-only Integer32 reports the current supply voltage measured on the Ethernet NTE OSA5405 Card in mV units, a direct electrical health reading for the card. It matters because a voltage reading drifting outside the expected range on the Ethernet NTE OSA5405 Card can indicate a failing power converter or an unstable feed long before the card's operational state actually drops. For example, an administrator graphing this value over time on the Ethernet NTE OSA5405 Card notices a slow voltage sag and schedules a power-supply check before the card trips an alarm.