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(如块处理和控制命令例行程序)建立的一种网络控制 程序的数据区。用于请示工作时,它包含一个缓冲器前缀、一个事件控制块、一个工作区 和一个基本传输单元。