it appears that for the Huawei 96 Cabinets to do vectoring the MA5616 DSLAM in them needs 48 port VDSL2 Boards, so the cabinet is actually capable of supplying 192 lines.
The DSLAM might then be capable of 192 lines, but the cabinet might not.
Remember that the cabinet needs wiring correctly, including the pre-assembled plugs that go into each card, taking connections from the Krone strips in the other half of the cabinet.
All that comes pre-assembled, and it won't be set up for "the wrong kind of card".