Like they siad it is technically possible, but not recommended.
Huawei SCUM main control board has uplink ports, it can deloy uplink function in theory, but this solution is not recommend, normally 2*SCUM configured in one Huawei BLT chassis, one is active, another is standby, if active board stops working, all service can be automatically synchronize to standby board, but since not two boards both configured uplink modules, so the uplink service will be interrupted if deploy uplink function on SCUM.
In all, Huawei GIF and Huawei X2CES are the uplink board for MA5600T."
Huawei SCUM main control board has uplink ports, it can deloy uplink function in theory, but this solution is not recommend, normally 2*SCUM configured in one Huawei BLT chassis, one is active, another is standby, if active board stops working, all service can be automatically synchronize to standby board, but since not two boards both configured uplink modules, so the uplink service will be interrupted if deploy uplink function on SCUM.
In all, Huawei GIF and Huawei X2CES are the uplink board for MA5600T."