Signal strength is measured in dBm (decibels relative to one milliwatt). Values range from dBm (excellent) to dBm (unusable). For reliable connectivity, target dBm or stronger. SNR (Signal-to-Noise Ratio) matters more than raw signal strength. An SNR of dB or higher ensures good performance. Even strong signals become unusable if noise levels are high. When surveying, measure both signal strength and noise floor at each location.
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$ curl repovive.com/roadmaps/network-design/wireless-networking/signal-strength-and-snr
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