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wireless-regdb: Why crda db.txt disallows 40Mhz BW on Channel 12-13 for JP?

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Hello All,

Crda db.txt has following entries for JP:
        (2402 - 2472 @ 40), (N/A, 20)
        (2457 - 2482 @ 20), (N/A, 20)

Why are channel 12 and 13 for JP disallowed to operate in 40Mhz by this file? 

As per Annex 11J of latest 802.11n spec, for Japan, channel 1-7 are allowed in HT40+ and channel 5-13 are allowed in HT40- mode.

Thanks,
Yogesh

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