I have a MSM48c that is currently running on verion 12.6 code , and has G48Ta / 10G4Xc cards installed , the end user is suggesting an 8900 spec card , I believe it is not supported ( MSM128 ) just want to see some documented evidence.
That configuration will run just fine, but you'll be limited to EXOS v15.1.x because of the G48Ta (not supported after that).
To use the full capabilities of the 8900 cards, you'll want a MSM128 to also be present.