In 802.11 networks, re-transmissions adversely affect throughput and latency. Data corruption and therefore re-transmissions will occur if the received signal is too close to the noise floor. For example, if a radio (client device) receives a signal of -75 dBm and the noise floor is measured at -90 dBm, the SNR is 15 dB. SNR is not actually a ratio but the difference in decibels between the received signal and the background noise level (noise floor). Any functionality is highly unlikely.Īnd what about SNR (Signal to Noise Ratio) Packet delivery may be unreliable.Īpproaching or drowning in the noise floor. Minimum signal strength for basic connectivity. Minimum signal strength for reliable packet delivery. Minimum signal strength for applications that require very reliable, timely packet delivery. Not typical or desirable in the real world. The client can only be a few feet from the AP to achieve this.
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