I found this in a house in Chicago. It is in the laundry room, the room has a laundry tub. This “drain” goes to the ejector pump in the next room. I think it is a laundry drain, but have never seen it like this. Usually you would just drain to the laundry tub.
I am pretty sure. Well It is in the basement. I guess it could go to the drain on the laundry sink that is about 6 feet to the left of it, then to the ejector pump. But, my concern is why this configuration? Unless it is an unconventional vent.
No sump in this house, I thought that was odd. I think it has to go the ejector pump. The Main drain is about 2 feet above floor level in the basement. I have a picture, the arrows are the other end of that drain.