Most mission-critical network devices feature redundant power supplies (each with its own power cord) that can connect to separate power sources. However, many other network devices do not have this redundant capability because it has only one power cord. PDUs with ATS provide redundancy for the single-corded devices by allowing it to connect to two separate power sources. Depending on the desired level of power protection, the two sources can be two UPS systems, two generator-supported utility wall outlets or one UPS system and one generator-supported utility wall outlet.