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Murali, first I have to compliment you on that fact that you're doing this detailed research. It's very rewarding.

Keep something in mind. 'Capability Info' is just that...what it's capable of. If the AP is capable of short preambles, it should always state that it supports short preambles unless you hard-set it otherwise.

Also, don't assume that a device can't read the ERP IE if it's not an 802.11g station. In your research look at what phy rate that is communicated at.

Clients look at the ERP IE for the status of the current state of the BSS for those parameters.

Shawn