Dear friend!
The EFI board usually provides the ETH port for connecting to the NMS and the ETH port for cascading the master and slave subracks. Both of them support the full-duplex mode. You can check the status of the link by viewing the indicators on the port.
When the network cable is connected, the orange light of the Ethernet port will be on, and when there is data passing, the green light will flash.
Thanks!