220-1101 · Question #83
While implementing a non-carrier-grade wireless backhaul, a technician notices the current channel selection is extremely polluted with various RF signals. Upon performing a spectral analysis, the…
The correct answer is A. The channel is reserved for licensed band use. The 2.4 gigahertz (GHz) band is subdivided into up to 14 channels, spaced at 5 MHz intervals from 2412 MHz up to 2484 MHz. Wi-Fi requires bandwidth of approximately 20 MHz, not 5 MHz. Consequently, a site designer needs to choose the channels that do not overlap. On a WLAN…
Question
While implementing a non-carrier-grade wireless backhaul, a technician notices the current channel selection is extremely polluted with various RF signals. Upon performing a spectral analysis, the technician discovers a channel containing almost no RF pollution. Unfortunately, the technician is unable to select that channel. Which of the following is the MOST likely reason for this issue?
Options
- AThe channel is reserved for licensed band use.
- BThe channel selection is defective; contact the manufacturer.
- CThe channel must be unlocked by the vendor.
- DThe device requires a firmware update to unlock the channel.
How the community answered
(27 responses)- A78% (21)
- B15% (4)
- C4% (1)
- D4% (1)
Explanation
The 2.4 gigahertz (GHz) band is subdivided into up to 14 channels, spaced at 5 MHz intervals from 2412 MHz up to 2484 MHz. Wi-Fi requires bandwidth of approximately 20 MHz, not 5 MHz. Consequently, a site designer needs to choose the channels that do not overlap. On a WLAN where only the first 11 channels are available, channels 1, 6, and 11 can be selected as non- overlapping. Note: In the Americas, regulations permit the use of channels 1-11 only, while in Europe, channels 1-13 are permitted. In Japan, all 14 channels are permitted. Those channels
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