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Question 7 - CWAP-404 discussion

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ABC International has installed a new smart ZigBee controlled lighting system. However, the network team is concerned that this new system will interfere with the existing WLAN and has asked you to investigate the impact of the two systems operating simultaneously in the 2.4 GHz band. When performing Spectrum Analysis, which question could you answer by looking at the FFT plot?

A.
Do the ZigBee channels used by the lighting system overlap with the WLAN channels?
Answers
A.
Do the ZigBee channels used by the lighting system overlap with the WLAN channels?
B.
Is the ZigBee system using more than 50% of the available airtime?
Answers
B.
Is the ZigBee system using more than 50% of the available airtime?
C.
Is the WLAN corrupting ZigBee system messages?
Answers
C.
Is the WLAN corrupting ZigBee system messages?
D.
Is the ZigBee system causing an increase in WLAN retries?
Answers
D.
Is the ZigBee system causing an increase in WLAN retries?
Suggested answer: A

Explanation:

The FFT plot is a spectrum analysis plot that shows the RF power present at a particular frequency over a short period of time. It can help identify the sources and characteristics of RF signals in the spectrum. By looking at the FFT plot, you can determine which ZigBee channels are used by the lighting system and whether they overlap with the WLAN channels in the 2.4 GHz band. ZigBee channels are 5 MHz wide and WLAN channels are 20 MHz or 40 MHz wide, so there is a possibility of overlap and interference between them. The other questions cannot be answered by looking at the FFT plot alone, as they require other types of plots or analysis tools, such as duty cycle plot, airtime utilization plot, or protocol analyzer.Reference:[Wireless Analysis Professional Study Guide], Chapter 3: Spectrum Analysis, page 69-70

asked 16/09/2024
Petya Pavlova
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