Understand the concepts for supplying power to network equipment. Battery backup/ uninterruptable power supplies (UPSs) maintain voltage and the quality of the power during a power outage. A stand-by UPS is often found under a desk for an individual PC. A line interactive UPS is often used for small racks of networking equipment, and an online UPS is used for datacenters. Power generators can provide a constant supply of electricity during a power outage with the use of fuel, an engine, and a generator. Dual-power supplies allow power to be fault tolerant at the network device or server level. Redundant circuit are common in datacenters; each rack is supplied with an A circuit and a B circuit. Each of the circuits is plugged into one of the dual-power supplies.
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