Why it matters?

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.

SNRConnection Quality
10dB - 15dBUnreliable Connection
16dB - 24dBPoor
25dB - 40dBGood
41dB or GreaterExcellent

Noise can be any of the following:

  • Microwave Ovens
  • Telefones sem fio
  • 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. Antenna orientation and placement can also have an effect on SNR.

Most modern network analyzers can help troubleshoot SNR and or Wi-Fi issues.