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Difficulty: MediumWireless Network Deployment and Standards

A network technician is installing three adjacent wireless access points along a corridor in an office building using the 2.4 GHz band with 20 MHz channel widths. To prevent co-channel interference and signal degradation, which combination of non-overlapping channels should be assigned to these access points?

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

Answer

Channels 1, 6, and 11
In the 2.4 GHz Wi-Fi spectrum, individual channel center frequencies are separated by 5 MHz, whereas standard transmissions require 20 MHz of bandwidth. Channels 1, 6, and 11 are spaced 25 MHz apart, making them the only three standard non-overlapping channels in 11-channel regulatory domains.

Step-by-Step Solution

1
Identify the frequency spectrum and channel width requirements.
The network operates on the 2.4 GHz band using standard 20 MHz channels.
In the 2.4 GHz spectrum, center frequencies are spaced 5 MHz apart, but each channel requires a 20 MHz spectrum mask.
2
Calculate required channel spacing to avoid overlap.
Channels must be separated by at least 25 MHz (5 channel numbers) to avoid frequency overlap.
Sufficient frequency separation ensures neighboring access points operate without adjacent-channel or co-channel interference.
3
Select the standard non-overlapping channel set.
Channels 1, 6, and 11 provide three distinct non-overlapping paths.
Assigning channels 1, 6, and 11 across adjacent wireless cells maximizes throughput and minimizes co-channel interference.

Key Concept

2.4 GHz Non-Overlapping Channel Assignment
Estimated Time:1m 0s
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Topics

Wireless Network Deployment and Standards

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