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Some NAT wireless routers, for example (notably dd-wrt open source router firmware) use SNR margin, only denoted as ' SNR'.

SNR margin is often confused and used interchangeably with SNR. It is in essence a buffer that allows for fluctuations in SNR without dropping the connection. It can be simplified to: the difference between actual signal and signal required to sync. noise margin) is the difference between the actual SNR and minimal SNR required to sync at a specific speed. Signal-to-noise ratio ( SNR) is defined as the power ratio between a signal (meaningful information) and the background noise (unwanted signal): SNR = signal / noise 6dB or below SNR is bad, you will experience no sync, or intermittent sync problems 7dB-10dB is fair but does not leave much room for variation in conditions 11dB-20dB is good with little or no sync problems (if no large variation) 20dB-28dB is excellent 29dB or above is outstanding The more commonly used SNR margin, as described below is sometimes abbreviated as simply SNR as well. Noise (dBm) in communications is a combination of unwanted interfering signal sources, such as crosstalk, radio frequency interference, distortion, etc.

For mac download Windows System Control Center 7.0.6.8