Appendix B Maintaining the Wide Area Virtualization Engine

Maintaining Your Site Environment

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 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

 

 

Cisco Wide Area Virtualization Engine 274 and 474 Hardware Installation Guide

 

 

 

 

 

 

OL-17739-01

 

 

B-5

 

 

 

Page 81
Image 81
Cisco Systems 274, 474 manual Electromagnetic and Radio Frequency Interference, Magnetism