SMC Networks SMC2664W - Manual (Page 22)

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vendors may use the setting “Open System.” Use the same setting as
the other devices in your network.
8. Set the “Channel” to the same radio channel as that used by the other
wireless clients in your group. However, if you are connecting to a
network via an access point, the adapter will automatically set the
channel to the same as that used by the access point.