Hi, friend.
SCU means a simple combiner unit.
You could run the interface scu command, this command is used to enter SCU mode from global config mode. Super Control Unit ( SCU ) is the control board of the device. SCU mode is control board mode, that is, in SCU mode, you can configure the interface of the SCU board. In SCU mode, you can configure the parameters of the Ethernet network port of the SCU board.
For more details, please click: interface scu
Thanks.