A network services request unit that is sent by a system services control point ( sscp ) to a logical ? unit ? ( lu ) to inform the lu of the status of a procedure requested by the lu 一種網絡服務請求單元,由系統(tǒng)服務控制點( sscp )送到邏輯單元( lu ) ,通知該邏輯單元所請求過程的狀態(tài)。