An absolute must in mission-critical applications, the general concept behind power redundancy is to connect critical equipment to two independent power sources. If one line of power is interrupted, the second is able to power the critical equipment. This is accomplished in the following. First, equip the cabinet with two PDUs, each of which is capable of handling the power requirements of the entire cabinet. Plug one PDU into the first power source and the other into the alternate. Plug each piece of equipment into both (most data center equipment today has multiple power supplies as a fail-safe).
