This standard describes the ATSC Mobile DTV system, hereafter referred to as the ATSC mobile/ handheld (M/H) system. The M/H system provides mobile/pedestrian/handheld broadcasting services using a portion of the ~19.39 Mbps ATSC 8-VSB payload, while the remainder is still
available for HD and/or multiple SD television services. The M/H system is a dual-stream
systemÑthe ATSC service multiplex for existing digital television services and the M/H service
multiplex for one or more mobile, pedestrian and handheld services.