15dB to 25dB SNR = Low signal (2 bars).

25dB to 40dB SNR = Very good signal (3 - 4 bars).

>40dB SNR = Excellent signal (5 bars).

Generally speaking, you want as high an SNR value as possible. Whether or not you have a good SNR value depends on what type of signal you’re working with. Raising the signal level will help in such situations. One of the great challenges in providing cellular, radio, and WiFi is providing enough signal strength to rise above any other forms of interference. The noise floor varies depending on the background noise in the environment. The higher the noise level, the less space there is for the actual data that is being transmitted on the channel. This means that for a given signal level, an increase in noise will decrease the data throughput. When SNR increases, the channel's data throughput also increases. This will degrade wireless throughput and latency as the retransmitted signals will take up airtime in the wireless environment. Signals close to the noise floor can be subject to data corruption, which will result in retransmissions between the transmitter and receiver.

If the SNR value gets lower than one, the signal becomes unusable. The noise interferes with the signal processing capabilities of your network, causing random noise and amplitude modulation. With a lower value, you start to introduce Gaussian noise into your network (expressed as static), and as the number becomes closer to 1, the worse the static gets. In the most basic terms, SNR determines how usable your signal will be.Ī higher SNR value means the signal is clearer. The higher the value on one end in relation to the value on the other, the greater or lower your overall SNR value will be. It is, essentially, a balance beam between your signal power and noise power. Providing a definition of SNR can get very technical.

For Commercial What is SNR? Why is SNR Important?

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