Overview
IEC 62356-3:2003 - "Video recording - 12,65 mm type D-11 format - Part 3: Data mapping over SDTI" defines how type D-11 compressed picture data is transported over the Serial Data Transport Interface (SDTI, SMPTE 305.2M). The standard specifies header and payload mapping, placement of auxiliary data, and embedding of up to four AES3 audio channels and time-code (VITC) into H‑ANC packets. It covers SDTI operation at the supported interface frame rates (24/1,001 Hz, 24 Hz, 25 Hz, 30/1,001 Hz and 30/1,001/60/1,001 variants) and references detailed payload and header structures used for interoperable video-data transport.
Key topics and technical requirements
- Payload mapping: Type D-11 data-stream packets (compressed picture + auxiliary data) are mapped into the SDTI payload space; each field contains three equal data segments (total six segments per frame) so packets 0–2 map to field 1 and 3–5 to field 2.
- Header data: Header words are carried in H‑ANC immediately after EAV per SMPTE 305.2M; header content is defined (53 words total) including DID/SDID, data count, block type and CRC fields.
- Basic block formatting: D-11 compressed picture basic blocks conform to IEC 62356-2. For SDTI transport, each basic block is extended by a 1‑byte reserved word (default 00h) and four bytes of Reed‑Solomon ECC, and payload CRCs are included.
- AES3 and VITC in H‑ANC: Up to four 24‑bit AES3 channels and Vertical Interval Time Code (VITC) can be mapped into ancillary packet space (H‑ANC) following SMPTE 272M and related SMPTE practices.
- Interface timing and sizing: The standard specifies total lines and samples per line for each interface frame rate and exact horizontal/vertical mapping regions for compressed picture data (per SMPTE 259M line numbering).
Applications and practical value
- Ensures interoperable transport of D‑11 compressed video over SDTI links in broadcast and professional video systems.
- Enables equipment manufacturers (tape decks, recorders, SDTI interface cards), systems integrators and post‑production facilities to implement a consistent mapping for compressed video plus embedded audio/time‑code.
- Useful for archival workflows and high‑quality contribution links where D‑11 compression (IEC 62356-2) must be carried over standard SDTI/SDI infrastructures.
Who should use this standard
- Broadcast engineers and system designers implementing SDTI video transport.
- Hardware and software vendors building D‑11 recorders, SDTI transmitters/receivers, and ancillary-data processors.
- Archive specialists and post‑production studios requiring precise mapping rules for compressed picture and audio/time‑code transport.
Related standards
- IEC 62356-2 (D‑11 picture compression and data stream)
- SMPTE 305.2M (SDTI)
- SMPTE 259M, 272M, 291M (SDI/ANC formatting)
- AES3 (digital audio format)
Keywords: IEC 62356-3, SDTI, type D-11, D‑11 mapping, SMPTE 305.2M, AES3, VITC, Reed‑Solomon ECC, SDI, video recording standard.