This read-write object selects the duty cycle -- 63/37 or 50/50 -- used by the composite-clock signal on this group's output ports, per its description. The chosen duty cycle must match what the receiving clock equipment expects, since a mismatched duty cycle on a composite clock signal can prevent correct timing recovery. For example, if legacy downstream equipment requires a 63/37 duty cycle and the newer default is 50/50, an admin would set this object to 63/37 for compatibility.