[硬體] 日本mac機器與台灣 802.11N 5GHz不相容
手上有一台日本代購的mac mini，連接Airport (802.11n 5Ghz only)時，會找不到
Airport。查了一下原因，原來台灣買的Airport，只能支援802.11N 5Ghz中channel
149, 153, 157, 161 ，而日本卻沒有開放這些channel 請參考
http://en.wikipedia.org/wiki/List_of_WLAN_channels
所以從日本買回來的mac機器，如果要配合台灣802.11N 5Ghz only的使用
會有問題。所以打算從日本買mac回來的要注意一下。
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至於為什麼要5Ghz only，因為太多無線, 藍芽裝置都走2.4Ghz，常常讓速度被影響。
所以決定上網設備都走5Ghz..真的順多了
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