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B-5
Hardware Installation Guide for Cisco Media Experience Engine 3000
OL-17000-01
Appendix B Maintaining the Cisco MXE 3000
Using Power Protection Devices
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Copier machines
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Air conditioners
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Vacuum cleaners
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Space heaters
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Power tools
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Teletype machines
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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
Besides these appliances, the greatest threats to a system’s supply of power are surges or blackouts
caused by electrical storms. Whenever possible, turn off the system and any peripherals and unplug them
from their power sources during
thunderstorms.
If a blackout occurs—even a temporary one—while the system is turned on, turn off the system
immediately and disconnect it from the electrical outlet. Leaving the system 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
system.
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, page B-5
• Line Conditioners, page B-5
• Uninterruptible Power Supplies, page B-6
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 system 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.
Line Conditioners
Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep a
system’s AC power source voltage at a fairly constant level and therefore can handle brownouts. Because
of this added protection, line conditioners cost more than surge protectors—up to several hundred
dollars. However, these devices cannot protect against a complete loss of power.