HP M210 Configuration And Administration Manual page 88

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The channel is locked because the Locked checkbox is selected.
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The proposed channel has not yet been applied (there is a small window of time between
the proposal and the application of the proposed channel).
Status
Indicates whether the channel is up or down.
Locked
You can select to lock the AP onto the current channel. When selected, automated channel
plans cannot reassign the AP to a different channel as a part of the optimization strategy.
Instead, APs with locked channels will be factored in as requirements for the plan.
88 Clustering multiple M210s