https://purengom.com/2010/08/08/mac-os-x-%ec%97%90%ec%84%9c-24ghz-80211n-%eb%a7%81%ed%81%ac-%ec%86%8d%eb%8f%84-%ec%b6%94%ea%b0%80-%ed%8f%ac%ec%8a%a4%ed%8a%b8/