Look at the silver label on the back of the chassis and see what version is printed to the right of "CHS-3U Rev A1". If the revision starts with an "A" or a "P" then this chassis supports all models with the exception of the copper interface versions of the MX and FX family. These unsupported models would be:
Chassis with a revision of "B" or newer support all TestCenter test modules.
Note: Chassis with revision "A" or a "P" can be upgraded to support the Copper interface modules, please see your Spirent Representative for details. Please reference the ACC-2016A upgrade kit.
*All, MX-10G-Sx cards are supported.