This is a part from an IBM server dated 2008 that I want to reuse in my new computer. It essentially converts from 1 SAS port to 4 SATA ports. I’ll use the raid card to connect to it via SAS, but I do not know what the power port is and what the connector on the top is either
Same question on reddit a while ago
As suggested there, I recommend to use a multimeter to identify the power socket pins. Roughly half of them should be ground. Most or all of them should correspond and be connected to the SATA power connector pins on the other side.