Ravi, normally, you want to have APs from the same vendor to ensure proper communications between APs so that seamless roaming can happen. But, even though the 5131 and 7532 are from the same vendor, they use different operating systems and will not communicate with each other. You *will* be able to have the your wireless devices 'hop' between each of the 5131's, or between each of the 7532's, but if the client needs to hop from a 5131 to a 7532, the client will have to re-authenticate with the new AP as part of the hop.