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Difficulty: EasyWireless Network Deployment and Standards

A network technician is deploying multiple wireless access points across an office floor using the 2.4 GHz frequency band in North America. To prevent co-channel interference between adjacent access points, the technician needs to select channels that do not overlap. Which combination of channels should the technician assign to the access points?

  1. Channels 1, 6, and 11Answer
  2. B
    Channels 1, 2, and 3
  3. C
    Channels 2, 7, and 12
  4. D
    Channels 5, 10, and 15

Answer

Channels 1, 6, and 11 are the three standard non-overlapping channels in the 2.4 GHz wireless spectrum for North America.
In 2.4 GHz wireless deployments in North America, standard Wi-Fi signals occupy 20 MHz of channel bandwidth. Because center frequencies are spaced 5 MHz apart, selecting channels 1, 6, and 11 provides a 25 MHz separation between center frequencies, ensuring complete frequency isolation with zero overlap.

Step-by-Step Solution

1
Analyze the bandwidth and channel spacing in the 2.4 GHz spectrum.
The 2.4 GHz Wi-Fi spectrum uses 20 MHz wide channels spaced 5 MHz apart from center-to-center.
Understanding spacing vs bandwidth is essential to determine frequency overlap.
2
Determine the required separation between non-overlapping channels.
Channels require a spacing of at least 5 channel numbers (25 MHz) between center frequencies to prevent spectral overlap.
A 25 MHz separation ensures that signal sidebands do not interfere with neighbouring transmissions.
3
Identify the standard non-overlapping channel set.
Channels 1, 6, and 11 provide the necessary 25 MHz separation across the 11 available channels in North America.
Using channels 1, 6, and 11 allows multi-AP deployment without co-channel interference.

Key Concept

2.4 GHz Wireless Non-Overlapping Channels
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Topics

Wireless Network Deployment and Standards

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