In ACF / VTAM, pertaining to a physical unit ( PU ) or logical unit ( LU ) that has an active physical path to the host processor containing the system services control point ( SSCP ) that controls the PU or LU.

• 在IBM通信系统软件ACF/VTAM中,用于修饰或说明物理单元(PU)或逻辑单元(LU),它们具有一个可用的物理通路,通向包含系统服务控制点(SSCP)的主处理机,而该SSCP负责控制这些PU或LU。