DVB-RCT（地面数字电视系统回传信道） 技术分小组创建于 1999年12月，承担着规定物理层 、媒体接入控制层和RF实施指南的巨大任务， 它们构成DVB-RCT技术规范。-DVB-RCT (terrestrial digital television system return channel) technology sub-group was founded in December 1999, are responsible for the provisions of the physical layer, media access control layer and the enormous task of RF implementation guide, which constitute the DVB-RCT specification.