Cisco Systems 511 Manual De Usuario

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 

.

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.