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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 11: Power Supplies, Surge Protection and Uninterruptible Power Supplies

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Uninterruptible Power Supplies (UPSes)

No, these are not only the guys in brown trucks delivering packages. Since surge protectors don't help if power is completely lost, an Uninterruptible Power Supply (UPS141) is needed. Connect critical devices to a UPS, which allows systems to function long enough to prevent data loss. Generally a UPS has the capacity to deliver between 10 and 20 minutes of operation without power, which is long enough to save all data and shut down the system safely.

A UPS supplies AC power, even when normal AC power is not unavailable. The UPS combines a very old and a fairly new technology. Batteries have been around for many years. The new technology is that of inverters – the ability to take a DC signal, and through high-speed switching, make a waveform that appears to be AC in nature.

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141. http://www.its.bldrdoc.gov/fs-1037/dir-039/_5702.htm

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