For this reason, if you have a mixture of AP types, it is recommended that you group like access points together (for example, AP-3800s on, say, one floor and Cisco Catalyst 9120s on another) and refrain from mixing them. Allows the access point to intelligently determine the operating mode of serving radios based on the RF environment. The access point can operate in the following modes: The Cisco Catalyst 9120AX Series Access Points are the next generation of enterprise access points. They are resilient, secure, and intelligent. The Cisco products are designed to comply with the following national and international standards on Human Exposure to Radio Frequencies:

This device must accept any interference received, including interference that may cause undesired operation. This Cisco Catalyst 9120AXI Access Point supports Software-Defined Access, Cisco’s leading enterprise architecture. Working together, this and Cisco DNA offer such features as: Cisco Embedded Wireless Controller on Catalyst Access Points: Indoor, challenging environments, with external antennasManaging dual 5-GHz cells is one of the most important things that FRA does. There are two modes of operation for dual 5-GHz APs: https://www.cisco.com/en/US/prod/collateral/wireless/ps9391/ps9393/ps9394/prod_white_paper0900aecd807395a9_ns736_Networking_Solutions_White_Paper.html

With Cisco Services, you can achieve infrastructure excellence faster with less risk. From an initial WLAN readiness assessment to implementation, full solution support, and in-depth training, our services for the Cisco Catalyst 9120AX Series provide expert guidance to help you successfully plan, deploy, manage, and support your new access points. With unmatched networking expertise, best practices, and innovative tools, Cisco Services can help you reduce overall upgrade, refresh, and migration costs as you introduce new hardware, software, and protocols into the network. With a comprehensive lifecycle of services, Cisco experts will help you minimize disruption and improve operational efficiency to extract maximum value from your Cisco DNA-ready infrastructure. Operation in the band 5150-5250 MHz is only for indoor use to reduce the potential for harmful interference to co-channel mobile satellite systems. Field Notice: FN-63942 APs and WLCs Fail to Create CAPWAP Connections Due to Certificate Expiration A tamper-resistant, strong cryptographic, single-chip solution provides hardware authenticity assurance to uniquely identify the product so that its origin can be confirmed to Cisco. This provides assurance that the product is genuine. Smart antenna connector: An intelligent second physical antenna connector is included on 9120AX Series access points with an external antenna. This connector provides advanced network design flexibility for high-density and large open-area environments such as auditoriums, convention centers, libraries, cafeterias, and arenas/stadiums, allowing two sets of antennas to be connected and active on a single access point.Cisco Catalyst 9162I Access Point, Wi-Fi 6E, Internal Antennas, 2x2+2x2+2x2 MIMO, 2.5G mGig with Meraki. I don't have DE enabled so can't see what the channels are for DE. But the tx-power and indoor.outdoor look the same anyway.