The DS1 Over DS3 Port Statistics object is a child of the DS1 Over DS3 Port object. There is an instance of the DS1 Over DS3 Port Statistics object below each DS1 Over DS3 Port object. The DS1 Over DS3 Port Statistics object does not have any fields or pushbuttons, and you cannot configure or manage it. It exists simply as a way of grouping its 'Summary period' child objects.