Here the missing pin assignment:

Yes, I have only once been connected incorrectly, because it is of course totally banana. Here would Hirschmann / Triax still potential for improvement. Therefore, a star deduction. The plastic parts using the arrow symbols are probably for reasons of cost the same as those through sockets with input and output, but then you would have to follow the up / down logic.

Otherwise, the box is processed properly and does what it should.