|  | 8.11 | Network Power Supply Issues: Surge Suppressors and Uninterruptible Power Supply (UPS) Functions
| 8.11.5 | UPS: components

A UPS consists of batteries, a battery charger, and a power inverter. The functions of each are as follows:

- inverter - convert low-level direct current voltage of the batteries into the AC voltage, normally supplied by the power line, to networking devices
- battery charger - designed to keep the batteries in peak condition during periods when the power line system is functioning normally
- batteries - generally, the bigger the batteries in a UPS, the longer a period of time it will be able to support networking devices during power outages