We are doing a site survey for wireless infrastructure. Redundnat controller implementations is what we are looking at. We were informed about using 2 controllers for redundancy but now during site survey, it has been informed that a different version of code is required to support 1252 and 1522 mesh APs. That essentially mean that if we have a mix of these two types of APs, two controllers each (four total) will be required. That seems to be too many controllers to support even if it is a small site requiring few 1252 and 1522 APs. Any particular reason that a controller running a particular version of code can not support both types of APs?