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Spirent KB Article
Doc ID: FAQ19365
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Spirent TestCenter: Why if I set a WiFi client HE to NONE, it does not constrain it to VHT?
If you want a client to use AX/AC specifically, you must set the mode in the client profile, as this doesn't depend on the HE value.
If you set the HE value to NONE, it means that there will be no HE at all, but this is not the way to set a client as "VHT" or "HE".
Product : WiFi,Spirent TestCenter