D-Link DWR-966 User Manual page 32

Control Side Band: Control sideband defines the sideband which is
used for secondary or extension channels when the AP is operating in a
40-MHz channel width. This setting is only applicable and used in
conjunction with the 40-MHz channel spacing.
Channel: This specifies the frequency the radio uses to transmit the
wireless frames. Select a channel from the list of channels or choose
"Auto" to let the system determine the best channel to use based on
the environment noise levels for the available channels.
Transmit Power: Select the signal power strength of the DWR-966's
Wi-Fi network.
Click Apply to apply the changes, or click Reset to undo your
configurations.
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