Before the NRT standard finalized, the push VOD transmission method using A/97 standard could be used as alternative way. To transmit push VOD contents in separated virtual channel with AN, a virtual channel of service_type Ox05 in VCT(Virtual Channel Table) is used. And this virtual channel must have more than one stream_type OxOB of DSM-CC(Digital Storage Media Command and Control). This time, the signaling for push VOD download data uses 2layer carousel scenario to transmit different group simultaneously. To distinguish the separate virtual channel of push VOD from other data download the compatibility descriptor specifically the OUI(Organizationally Unique Identifier), model, and version information is used. And additional information to transmit and store VOD contents is carried in sub descriptor. The sub descriptor contains broadcast_count, save-path, filename and etc.