本标准的目的是定义一种方法，将串行数字接口（SDI）上垂直辅助数据包（VANC）中存在的元数据和数据本质统一映射到基于DV25 Mb/s或50 Mb/s流的VAUX DIF块中。此外，该标准还定义了一种映射方法，该方法可使基于25 Mb/s DV的压缩方案的视频光圈增加一条视频线（扩展视频线）。VANC映射适用于使用25 Mb/s或50 Mb/s基于DV的压缩系统的525/60和625/50信号格式。扩展视频线的映射仅适用于基于25 Mb/s DV的流。该映射过程需要使用10位SDI接口来接收视频信号。

The purpose of this standard is to define a method to uniformly map metadata and data essence present within vertical ancillary packets (VANC) on the serial digital Interface (SDI), into VAUX DIF blocks of a DVbased 25 Mb/s or 50 Mb/s stream. Additionally, the standard defines a mapping method that results in an increase of the video aperture by one video line (extended video line) for the 25 Mb/s DV-based compression scheme. The VANC mapping is applicable to 525/60 and 625/50 signal formats that use the 25 Mb/s or 50 Mb/s DVbased compression system. The mapping of the extended video line is applicable only to the 25 Mb/s DVbased stream. This mapping process requires use of a 10-bit SDI interface for the incoming video signal.