Name: Cisco Catalyst 9200 Series
Brand: Cisco
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then creeps along the remaining metal surface either causing electrical short circuits or creating holes. Creep

corrosion also occurs on electronic components such as resistors and PCBs.

To prevent corrosion, remove or minimize the presence of dust and particulates at the installation site by

following the guidelines mentioned in ANSI 71-04-2013 regulations.

Figure 7: A PCB with Corrosion on its Metal Contacts

EMI and Radio Frequency Interference

Electro-Magnetic 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 monitor. 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 in the form of 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:

• Always operate the system with the chassis covers installed.

• Ensure that all chassis slots are covered by a metal filler bracket and that an unused power supply bay

has a metal cover plate installed.

Cisco Catalyst 9200 Series Switches Hardware Installation Guide

Preparing for Installation

EMI and Radio Frequency Interference

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