Wireless Range and Signal Strength
Unit: 12
Lesson: 2
signal jamming but instead it's wifi
Wifi-enabled devices should have an indoor range of 100 feet, and double or even triple that for outdoor range. 2.4 GHz better support higher ranges than the 5/6 GHz bands, but clients choose which band to use using the DRS mechanism.
Calculating Signal Strength
Signal strength is represented as the ratio of measurement to 1 milliwatt (mW), where 1 mW is equal to 0 dBm. dB and dBm can be used to analyze losses and gains in signal strength along a path.
The Received-Signal-Strength-Indicator (RSSI) is the strength of a signal from a transmitter as measured at the client station's end. Whether or not to use dBm or an index value to measure signal strength depends on the vendor of the client.
Signal-to-Noise Ratio (Raw Lesson Content)
The comparative strength of the data signal to the background noise is called the signal-to-noise ratio (SNR). Noise is also measured in dBm, but here values closer to zero are less welcome as they represent higher noise levels. For example, if signal is ‑65 dBm and noise is ‑90 dBm, the SNR is the difference between the two values, expressed in dB (25 dB). If noise is -80 dBm, the SNR is 15 dB and the connection will be much, much worse.
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