@DaleCooper
The DX protocol is 32×32, this is why you can cascade 2 units in any combination of DX168’s, DX164W’s and DX012’s because they all have a maximum of 16 inputs or outputs.
The DX32 on the other hand, takes up the full 32 inputs or outputs in one go.
The DXHub and the GX4816 have a 128×128 channel GigaACE/GX connection to the console which are split out to separate 32×32 channel DX ports.
4 on the DXHub and 2 on the GX4816 (because the first 64×64 channels are used by the analogue sockets and ME outputs).
Cheers,
Keith.