The following sections describe sources of interference and how to minimize its effects on Cisco Catalyst
9800-80 Wireless Controller.
Electromagnetic Interference
All the equipment powered by AC current can propagate electrical energy that can cause electromagnetic
interference (EMI) and possibly affect the operation of other equipment. The typical sources of EMI are
equipment power cords and power service cables from electric utility companies.
Strong EMI can destroy the signal drivers and receivers in the controller and even create an electrical hazard
by causing power surges through power lines into installed equipment. These problems are rare, but could be
catastrophic.
To resolve these problems, you need specialized knowledge and equipment, which could consume substantial
time and money. However, you should ensure that you have a properly grounded and shielded electrical
environment, paying special attention to the need for electrical surge suppression.
The following table lists electrode magnetic compliance standards for the controller.
Table 11: EMC and Safety Standards
FCC 47 CFR
Part 15 Class A
VCCI Class A
AS/NSZ Class A
ICES-003 Class A
EN55022/CISPR 22 Information Technology Equipment (Emissions)
EN55024/CISPR 24 Information Technology Equipment (Immunity)
EN300 386 Telecommunications Network Equipment (EMC)
EN50082-1/EN61000-6-1 Generic Immunity Standard
EMC Standards
UL60950-1
CSA C22.2 No. 60950-1-03
EN 60950-1
IEC 60950-1
AS/NZS 60950.1
Safety
Standards
Radio Frequency Interference
When electromagnetic fields act over a long distance, radio frequency interference (RFI) can be propagated.
Building wiring can often act as an antenna, receiving the RFI signals and creating more EMI on the wiring.
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the plant
wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a high-quality
twisted-pair cable with one ground conductor for each data signal.
Cisco Catalyst 9800-80 Wireless Controller Hardware Installation Guide
29
Preparing Your Site for Installation
Interference Considerations
