本规范定义了通过带外路径交付的SI表，以支持数字电缆机顶盒和其他“数字电缆就绪”设备的服务选择和导航。本标准中定义的SI表根据MPEG-2系统[1]中定义的节目特定信息（PSI）数据结构进行格式化。

This specification defines SI tables delivered via an out-of-band path to support service selection and navigation by digital cable set-top boxes and other "digital cable-ready" devices. The SI tables defined in this standard are formatted in accordance with the Program Specific Information (PSI) data structures defined in MPEG-2 Systems [1].