Identifying a wall socket with 8 small, 2 larger holes in trapezoid/star configuration
I am not able to comment, so I will leave extra information here, in case it proves useful to you.

The connector is a Hirschmann MEDU1000 ref.973078-135 from the ME series.

It is used for control signals.

According with product description, it can be used for connecting telecommunications, measurement systems and laboratory equipment.

Sorry, but I don't know what specific devices might require this connection.