Cisco 9971 - Cleanair

Cisco Unified IP Phone 9971 Wireless LAN Deployment Guide
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In later versions of the Cisco Unified Wireless LAN Controller it does not allow both TPC (Power Constraint) and DTPC
(Dynamic Transmit Power Control) to be enabled simultaneously.
Channel Announcement and Channel Quiet Mode should be enabled.
CleanAir
CleanAir should be Enabled when utilizing Cisco Access Points with CleanAir technology in order to detect any existing
interferers.