Brocade FOS 6.x and 7.x Interoperability and FOS 7.x Supported Products

How to check If old SAN switches with FOS 6.x are supported to be connected with new SAN SW with FOS 7.x?

FOS V7.0 is only supported on 16G and 8G platforms. 
Means all 2498-xxx  and 2499-xxx products sold by IBM.

IBM Release notes for Brocade SAN SW with FOS 6.x

http://www-01.ibm.com/support/docview.wss?rs=1135&uid=ssg1S1003220

IBM Release notes for Brocade SAN SW with FOS 7.x

http://www-01.ibm.com/support/docview.wss?uid=ssg1S1003855

To check Interoperability between FOS 6.x and 7.x open PDF with given version e.g. Release Notes v7.0.1b from "IBM Release notes for Brocade SAN SW with FOS 7.x" and check the table "Supported Products and FOS Interoperability".