In a certain enterprise office wireless coverage scenario, since the VIP area has high bandwidth requirements and requires the terminal signal strength to be lower than -65 dBm, the STA is forced to…

Question

Options

• A15
• B20
• C30
• D25

• A
  15% (8)
• B
  4% (2)
• C
  10% (5)
• D
  71% (37)

Explanation

Option D (25 dB) is correct because the SNR threshold is derived from the relationship between the required signal strength and the standard noise floor reference: SNR = Signal threshold − Noise floor = −65 dBm − (−90 dBm) = 25 dB. A noise floor of −90 dBm is the standard reference used in enterprise wireless systems (such as Huawei's WLAN controllers) for this calculation.

Why the distractors are wrong:

• A (15 dB): Too low - corresponds to a signal of approximately −75 dBm, meaning weak clients would remain connected well past the −65 dBm threshold, violating VIP area requirements.
• B (20 dB): Also too low - maps to roughly −70 dBm, still not aggressive enough to enforce the −65 dBm cutoff.
• C (30 dB): Too high - corresponds to about −60 dBm, forcing clients offline even when their signal is still acceptable, which would cause unnecessary disconnections and roaming instability.

Memory tip: Use the formula SNR = Target Signal − Noise Floor, anchoring the noise floor at −90 dBm. For −65 dBm: subtract the negatives → 90 − 65 = 25. Any time you see −65 dBm as the cutoff on a Huawei wireless exam, the answer is 25 dB.

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