Cisco 4490 - Manual (Page 73)

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Cisco Global Site Selector 4490 Hardware Installation Guide
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Chapter 5 Maintaining the Cisco Global Site Selector 4490
Maintaining Your Site Environment
To reduce the effects of ESD, you should observe the following guidelines:
• Wear a grounding wrist strap. If a grounding wrist strap is unavailable, touch
an unpainted metal surface on the chassis periodically to neutralize any static
charge.
• Keep components in their antistatic packaging until they are installed.
• Avoid wearing clothing made of wool or synthetic materials.
Electromagnetic and Radio Frequency Interference
Electromagnetic interference (EMI) and radio frequency interference (RFI) from
a system can adversely affect devices such as radio and television (TV) receivers
operating near the system. Radio frequencies emanating from a system can also
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 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.