block control unit(BCU)

An network control program data area built by the channel manager and other routines such as the block handling and control command routines. Used to request work, it contains a buffer prefix, an event control block, a work area, and a basic transmission unit.; 由信道管理程序和其它例行程序(如塊處理和控制命令例行程序)建立的一種網絡控制 程序的數據區。用于請示工作時,它包含一個緩沖器前綴、一個事件控制塊、一個工作區 和一個基本傳輸單元。