Why does a STA still receive 802.11b/g signals after 802.11n is enabled on an AP

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According to IEEE 802.11n drafts, data cannot be transmitted at a full rate when passwords are unicast in WEP or TKIP encryption mode. If these encryption modes (such as WEP and WPA-TKIP) are used, the maximum data transmission rate is only 54 Mbit/s. Similarly, in TKIP or WEP encryption mode, an 802.11 b/g/n NIC can only associate with an AP in 802.11g mode. Therefore, the signal rate is 54 Mbit/s instead of the rate in the 802.11n protocol.

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