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C-5
Cisco Application Deployment Engine (ADE) 2130 and 2140 Series Appliance Hardware Installation Guide
78-18579-02
Appendix C Maintaining the Cisco ADE 2130 and 2140 Appliance
Maintaining Your Site Environment
RFI is defined as any EMI with a frequency above 10 kilohertz (kHz). This type of interference can travel
from the appliance to other devices through the power cable and power source or through the air like
transmitted radio waves. The Federal Communications Commission (FCC) publishes specific
regulations to limit the amount of EMI and RFI emitted by computing equipment. Each appliance meets
these FCC regulations.
To reduce the possibility of EMI and RFI, follow these guidelines:
• Operate the appliance only with the appliance cover installed.
• Ensure that the screws on all peripheral cable connectors are securely fastened to their
corresponding connectors on the back of the appliance.
Magnetism
Because they store data magnetically, hard disk drives are susceptible to the effects of magnetism. Hard
disk drives should never be stored near magnetic sources such as the following:
• Monitors
• Printers
• Telephones with real bells
• Fluorescent lights
Power Source Interruptions
Appliances are especially sensitive to variations in voltage supplied by the AC power source.
Overvoltage, undervoltage, and transients (or spikes) can erase data from the 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:
• Place the appliance on a dedicated power circuit (rather than sharing a circuit with other electrical
equipment). In general, do not allow the appliance to share a circuit with any of the following:
–
Copier machines
–
Teletype machines
–
Laser printers
–
Facsimile machines
–
Any other motorized equipment
Besides the above equipment, the greatest threats to an appliance’s supply of power are surges or
blackouts caused by electrical storms.
If a blackout occurs—even a temporary one—while the appliance is turned on, turn off the appliance
immediately and disconnect it from the electrical outlet. Leaving the appliance on may cause problems
when the power is restored.