This standard specifies the format for the transport of content packages (CP) on the serial digital transport interface (SDTI). This format is abbreviated to the term SDTI-CP. The format is a packaging structure for the assembly of system, picture, audio, and auxiliary data items as follows: - A system item assembled as a group of timing and control elements, plus any metadata associated with the picture, audio, and auxiliary data items; - A picture item assembled as a group of up to 255 picture stream elements; - An audio item assembled as a group of up to 255 audio stream elements; - An auxiliary item assembled as a group of up to 255 auxiliary data elements such as ancillary data lines, teletext, and other data. - This standard defines the structure of the content package mapped onto the SDTI transport. All element and metadata formats are defined by SMPTE 331M. - An SDTI-CP compliant receiver shall be capable of receiving and parsing the structure of the SDTI-CP format. - An SDTI-CP compliant decoder is defined by the ability to both receive and decode a defined set of elements and metadata according to an associated decoder template document. - The baseline operation of this standard is defined by the transport of content packages locked to the SDTI transport frame rate. This standard additionally defines format extension capabilities as follows: - Allow content package transfers at higher and lower than the specified rate through isochronous and asynchronous transfer modes; - Provision of a timing mode to reduce delay and provision for two content packages in each SDTI transport frame; - Carriage of content packages in a low-latency mode; and - Multiplexing of content packages from different sources onto one SDTI transport. - This standard is limited to SDTI operating at a bit rate of 270 Mb/s and 360 Mb/s as defined by SMPTE 305M.