I believe you have a 5 way powered splitter. One of the white coax cables comes from a the little black box at the bottom of the cabinet. This box takes 110V in and outputs 12V through the coax. The other white coax is the signal source from the cable company. The cable company doesn't really need an amplified splitter but there may be a coax from the attic attached to an antenna which would need amplification.
If you turn the splitter over you can see which cables are input, power, and output.
This doesn't really help with your problem but at least you understand the purpose. You still need a splitter unless you only use one cable for your house.
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