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WP820 Wi-Fi Roaming Application Note
Band selections are:
Dual band operation: 2.4GHz and 5GHz
5GHz band only: 5GHz has more capacity and less interference than 2.4GHz, but legacy clients are not
capable of using it.
Dual band operation with Band Steering: Band Steering detects clients capable of 5 GHz operation and
steers them to that frequency, while leaving 2.4 GHz available for legacy clients.