wifi 101
- The WiFi radio waves are very similar to the radios used for cell phones and other devices.
They can convert 1s and 0s into radio waves and convert the radio waves back into 1s and 0s. - Wifi can transmit from 2.4 GHz or 5 GHz
- 5G wifi (802.11ac) is the newest standard as of early 2013.
wifi radio waves RSSI
/System/Library/PrivateFrameworks/Apple*.framework/Versions/Current/Resources/airport -I
agrCtlRSSI: -44
agrExtRSSI: 0
agrCtlNoise: -92
agrExtNoise: 0
state: running
op mode: station
lastTxRate: 1170
maxRate: 1300
lastAssocStatus: 0
802.11 auth: open
link auth: wpa2-psk
BSSID: _:_:_:_:_:_
SSID: progessive_energy_5g
MCS: 9
channel: 153,80
Closer I move to router better signal strength I receive.
jshell> var signalToNoiseRatio = -44 - (-92)
signalToNoiseRatio ==> 48
Higher SNR margin values mean clearer signals.
RSSI table
| RSSI | desc |
|---|---|
| -30 dBm | Maximum signal strength (NEAR) |
| -50 dBm | excellent signal strength |
| -60 dBm | reliable signal strength |
| -67 dBm | reliable signal strength |
| -70 dBm | Not a strong signal. Light browsing and email. |
| -80 dBm | Unreliable signal strength, will not suffice for most services. Connecting to the network. |
| -90 dBm | The chances of even connecting are very low at this level. |
