The BCU is acting as: frame grabber, slope computer, High-Voltage Controller for the tip-tilt mirrors, collector of slopes from the FLAO BCU and from the TipTiltUnit, sender of slopes to the ASM.
[Only if you need to change the IP address] It may be easier to do this using a laptop. If it is already on the correct subnet you can use the VirtualBox and its EngPanel.
Make sure the remote power to the BCU power plug is off by checking on the remote command.
Make sure the power switch on the back of the BCU is set to ON.
Connect the power plug on the back of the BCU.
Insert the BCU in the rack following the red rails.
Screw the BCU to the rack (four small cross-screws on each corner).
Plug all cables paying attention to labels.
Take a picture of current cabling.
Power on the BCU using the remote command. LEDs should be all on.
Double check that the optical fiber is connected to the FL output; a single blue LED is on if there is already a physical link (the selected ASM input port is the ARGOS's one)
Update the corresponding twiki page and notify Lorenzo.