Cisco Systems 78-16356-01 manual Electromagnetic and Radio Frequency Interference

Chapter 5 Maintaining Your GSS

Maintaining Your Site Environment

To reduce the effects of ESD, 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) can adversely affect devices such as radio and television (TV) receivers operating near the GSS. Radio frequencies emanating from the GSS can also interfere with cordless and low-power telephones. Conversely, RFI from high-power telephones can cause spurious characters to appear on a monitor screen.

RFI is defined as any EMI with a frequency above 10 kHz. This type of interference can travel from the GSS 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 GSS meets these FCC regulations.

To reduce the possibility of EMI and RFI, follow these guidelines:

•Operate the GSS 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 GSS.

•Always use shielded cables with metal connector shells for attaching peripherals to the GSS.

	Cisco Global Site Selector 4491 Hardware Installation Guide
78-16356-01		5-5