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Cisco Global Site Selector 4491 Hardware Installation Guide
78-16356-01
Chapter 5 Maintaining Your GSS
Using Power Protection Devices
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Adding machines
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Laser printers
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Facsimile machines
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Any other motorized equipment
In addition to these appliances, the greatest threats to the GSS power supply are
surges or blackouts caused by electrical storms. Whenever possible, turn off the
GSS and any peripherals and unplug them from their power sources
during thunderstorms.
If a blackout occurs—even a temporary one—while the GSS is turned on, turn it
off immediately and disconnect it from the electrical outlet. Leaving the GSS on
may cause problems when the power is restored; all other appliances left on in the
area can create large voltage spikes that can damage the GSS.
Using Power Protection Devices
A number of devices are available that protect against power problems such as
power surges, transients, and power failures. The following subsections describe
some of these devices.
Surge Protectors
Surge protectors are available in a variety of types and usually provide a level of
protection commensurate with the cost of the device. Surge protectors prevent
voltage spikes, such as those caused during an electrical storm, from entering a
GSS through the electrical outlet. Surge protectors, however, do not offer
protection against brownouts, which occur when the voltage drops more than
20 percent below the normal AC line voltage level.