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I was told that iOS devices defaults to 802.11a which runs on 5 GHz band when 5 GHz 802.11n is not available. Have anyone experimented with that?

How does negotiation between access points and client devices work?

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up vote 2 down vote accepted

The wireless chipset samples all spectrums and chooses the frequency that has the highest potential speed with a joinable SSID and won't generally switch to a different network unless there are errors or a drop.

Since the protocols are different there isn't so much a negotiation as a decision tree which of the several channels to join.

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Thanks, I will test and try. – Shane Hsu Dec 27 '12 at 8:18

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