Option-Click AirPort Menu for Network Details
If you hold down the Option key while clicking the AirPort menu in Mac OS X 10.5 Leopard, you'll see not just the names of nearby Wi-Fi networks, but additional details about the selected network. Details include the MAC address of the network, the channel used by the base station, the signal strength (a negative number; the closer to zero it is, the stronger the signal), and the transmit rate in megabits per second showing actual network throughput. If you hover the cursor over the name of a network to which you're not connected, a little yellow pop-up shows the signal strength and type of encryption.
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The long-standing prohibition against Time Machine backing up to a USB hard drive attached to an AirPort Extreme Base Station has quietly disappeared with the 802.11ac model released in June 2013. So quietly, in fact, that Apple hasn’t even updated a support document warning that such a setup isn’t supported.
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