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B-6 Dell PowerVault 530F SAN Appliance User’s Guide
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Electromagnetic interference (EMI) and radio frequency interference (RFI) from a sys-
tem can adversely affect devices such as radio and 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 inter-
ference can travel from the system to other devices through the AC power cable and
power source or through the air like transmitted radio waves. The Federal Communi-
cations Commission (FCC) publishes specific regulations to limit the amount of EMI
and RFI emitted by computing equipment. Each Dell system meets these FCC regula-
tions.To reduce the possibility of EMI and RFI, follow these guidelines:
Operate the system only with the system cover installed.
Ensure that all expansion slots are covered either by a card-mounting bracket or
by a metal filler bracket and that all drive bays have a drive and/or a metal insert
installed. These brackets and metal inserts are available from Dell.
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.
To prevent the possibility of RFI from a system affecting TV reception, follow these
guidelines:
Keep any TV set at least 6 ft away from the system.
Use cable TV when possible.
Use a directional outdoor TV antenna.
Attach line filters to the TV set.
Use 75-ohm coaxial cable for the TV set rather than twin-lead antenna wire.
If interference occurs, rotate the system or the TV set 90 degrees.