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Cisco AVS 3120 Application Velocity System Hardware Installation Guide
OL-11805-01
Chapter 5 Maintaining Your AVS 3120
Maintaining Your Site Environment
To reduce the possibility of EMI and RFI, follow these guidelines:
• Operate the AVS 3120 only with its cover installed.
• Ensure that the screws on all peripheral cable connectors are securely fastened to their
corresponding connectors on the back of the AVS 3120.
• Always use shielded cables with metal connector shells for attaching peripherals to the AVS 3120.
Power Source Interruptions
The AVS 3120 is 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, always properly ground power cables.
Use one or both of the following methods:
• Use one of the power protection devices described in the “Using Power Protection Devices” section.
• Place the AVS 3120 on a dedicated power circuit (rather than sharing a circuit with other heavy
electrical equipment). In general, do not allow the AVS 3120 to share a circuit with any of the
following equipment:
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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
In addition to these appliances, the greatest threats to the AVS 3120 power supply are surges or blackouts
caused by electrical storms. Whenever possible, turn off the AVS 3120 and any peripherals, and unplug
them from their power sources during thunderstorms.
If a blackout occurs—even a temporary one—while the AVS 3120 is turned on, turn it off immediately
and disconnect it from the electrical outlet. Leaving the AVS 3120 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 AVS 3120.