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Get Detailed WiFi Info From the Menu Bar in Mac OS X

On a Mac computer, you can retrieve extended wireless connectivity data and details from anywhere within Mac OS X by holding down the Option key and then clicking on the WiFi menu.1 (See attached image).

 

Some of the more useful data:  

RSSI (Received Signal Strength Indicator) is a common name for the signal strength in a wireless network environment. It is a measure of the power level that a RF client device is receiving from an access point.  The closer the figure is to zero, the better. For example, an RSSI of -65 is better than -85.2

Noise - The noise level indicates the amount of background noise in your environment.  The closer the value to 0, the greater the noise level.   For example, -96dBm is a lower noise level than -20dBm.3

 

Sources: 

1. http://osxdaily.com/2011/06/15/get-detailed-wifi-info-from-the-menu-bar/

2. http://www.speedguide.net/faq/what-is-wireless-rssi-level-418

3. http://www.watchguard.com/help/docs/wsm/xtm_11/en-us/content/en-us/wireless/ap_wireless_signalstrength_c.html

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