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Appendix C Maintaining the Cisco Wide Area Application Engine
Maintaining Your Site Environment
C-6
Cisco Wide Area Application Engine 511 and 611 Hardware Installation Guide
OL-7220-02
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power
source. Overvoltage, undervoltage, and transients (or spikes) can erase data from
memory or even cause components to fail. To protect against these types of
problems, power cables should always be properly grounded and one or both of
the following methods should be used:
• Use one of the power protection devices described in the “Using Power
Protection Devices” section on page C-7.
• Place the system on a dedicated power circuit (rather than sharing a circuit
with other heavy electrical equipment). In general, do not allow the system to
share a circuit with any of the following:
–
Copier machines
–
Air conditioners
–
Vacuum cleaners
–
Space heaters
–
Power tools
–
Teletype machines
–
Adding machines
–
Laser printers
–
Facsimile machines
–
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.