Hello, friend!
If the MA5616 supports GE upstream transmission, you can set the GE upstream port to the cascading mode. When two independent devices need to be cascaded, you need to set the downstream port of the master device as a cascading port and set the upstream port of the slave device as an upstream port.
Run the port mode 0/0/0 ge command to set the working mode of the 0/0/0 port to GE.
Run the interface eth command to enter ETH mode, and then run the network-role 0 cascade command to set the 0/0/0 port as a cascading port.
Thanks!