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C-5
Cisco Wide Area Application Engine 511 and 611 Hardware Installation Guide
OL-7220-02
Appendix C Maintaining the Cisco Wide Area Application Engine
Maintaining Your Site Environment
interfere with cordless and low-power telephones. Conversely, RFI from
high-power telephones can cause spurious characters to appear on the system’s
monitor screen.
RFI is defined as any EMI with a frequency above 10 kilohertz (kHz). This type
of interference can travel from the system 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 system
meets these FCC regulations.
To reduce the possibility of EMI and RFI, follow these guidelines:
• Operate the system only with the system cover installed.
• Ensure that the screws on all peripheral cable connectors are securely
fastened to their corresponding connectors on the back of the system.
• Always use shielded cables with metal connector shells for attaching
peripherals to the system.
Magnetism
Because they store data magnetically, hard disk drives are extremely susceptible
to the effects of magnetism. Hard disk drives should never be stored near magnetic
sources such as the following:
• Monitors
• TV sets
• Printers
• Telephones with real bells
• Fluorescent lights