Currently, the 4.9 GHz band is only available for unlicensed use in Japan. It is reserved for use by public safety wireless applications in the US. However, FCC regulations regarding the 4.9 GHz band may be changing, making 802.11j of interest to 802.11a WLAN users in the US as well. To read the FCC's recent ruling, see this FCC Memorandum (FCC 04-265, PDF). For more speculation about 802.11j and its potential US impact, see these Wireless Watch and Wi-Fi Planet articles.
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