However, the industrial PoE switches have dual DC inputs, guaranteeing a stable and reliable connection in harsh environments. Each power supply has the ability to work independently, which ensures that even if one power supply fails, the other takes over. Their design must balance stability, reliability, and scalability. This article will systematically review the core knowledge of. Unmanaged switches are one of those components that almost disappear once they are installed. They do not require configuration, they do not expose dashboards, and they rarely generate alarms. Power failures account for more than 35% of network outages.