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Understand Noise with Wi-Fi SNR

SNR, or Signal to Noise Ratio, also dBm, or decibel margins, is a measurement of how strong a signal is through the noise of the medium it is traveling through. It is the ratio of Signal to Noise. For example, a Signal of -24dBm with a noise of -90dBm would yield a SNR of 66dB.
SNR Connection Quality
10dB – 15dB Unreliable Connection
16dB – 24dB Poor
25dB – 40dB Good
41dB or Greater Excellent
Noise can be any of the following:
• Microwave Ovens
• Cordless Phones
• Bluetooth Devices
• Game Controllers
• Wireless Surveillance Systems
• Wireless Game Controllers
• Wireless Keyboards and Mice
• Fluorescent Lights
• etc.
SNR with higher values equates to faster data rates, fewer retransmissions and overall better throughput.
The SNR can be improvement by mitigating sources of noise, increasing the number of Access Points (better signal strength). Antenna orientation and placement can also influence SNR.
Most modern Wi-Fi network analyzers can help measure SNR and or troubleshoot low SNR related issues.