When conducting a WLAN network planning project in China, the customer requires the deployment of multiple 2.4GHz band APs. Which of the following channels is usually used when planning channels for…

The correct answer is B. 1, 6, 11. Channels 1, 6, and 11 are the three globally standardized, non-overlapping channels in the 2.4GHz band. Because each channel is 22MHz wide and channels are spaced only 5MHz apart, adjacent channels overlap and cause co-channel interference - you need at least 5 channels of…

WLAN Network Planning and Design

Question

When conducting a WLAN network planning project in China, the customer requires the deployment of multiple 2.4GHz band APs. Which of the following channels is usually used when planning channels for the entire network APs?

Options

A2, 7, 11
B1, 6, 11
C1, 5, 7
D2, 8, 10

How the community answered

(52 responses)

A
17% (9)
B
71% (37)
C
8% (4)
D
4% (2)

Explanation

Channels 1, 6, and 11 are the three globally standardized, non-overlapping channels in the 2.4GHz band. Because each channel is 22MHz wide and channels are spaced only 5MHz apart, adjacent channels overlap and cause co-channel interference - you need at least 5 channels of separation to be clean. Channels 1→6→11 each differ by exactly 5 channels (25MHz), making them the only universally recognized interference-free trio. Option A (2, 7, 11) fails because channels 7 and 11 are only 4 apart and overlap; Option C (1, 5, 7) has both pairs too close together; Option D (2, 8, 10) overlaps channels 8 and 10 (only 2 apart). Memory tip: "1, 6, 11 - count by fives, then add one" - start at 1, add 5 to get 6, add 5 to get 11.

Topics

#2.4GHz channels#non-overlapping channels#channel planning#frequency allocation

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