As many of you maybe aware that the new FCC update allows the use of additional channels 120, 124 and 128 as well as other power adjustment and updated DFS regulations.

The new regulatory domain -B is aimed to replace the current -A regulatory domain. Per the FCC order, access points shipped before June 1, 2016 are grandfathered to adhere to –A requirements. Access points shipped after the June 1 date must meet the –B requirements. This includes changes in DFS detection requirements, which must re-certify according to the new rules.

To support the -B access points, the WLCs would need to be upgraded to the appropriate codes. That said, it will be completely fine to mix -A and -B access points on the same controller and use in conjunction without any issues.

Full Cisco Blog article: