Fujitsu SPARC M10-4 Service Manual page 327

Connect all crossbar cables (optical) to the crossbar unit.
Note -
16.6 Restoring the System
Turn on the CB switches of the dedicated power distribution unit (PDU)
mounted on the rack for expanded connection.
Execute the diagxbu command to diagnose the crossbar cables.
XSCF> diagxbu -y -b 00 -t 01
Execute the showlogs command to confirm that the system is operating
normally.
XSCF> showlogs error
Start the entire system.
Close the rack door.
Chapter 16 Maintaining the Crossbar Units of the Crossbar Box 303