Part 1 of this standard specifies the format for the recording of Type D-11 compressed pictures, four channels of AES3 data and associated data which form helical records on 12,65 mm tape in cassettes. Part 1 also defines the helical track record parameters, the content and format of the longitudinal records and the physical specifications for the casette. The recording format supports frame frequencies of 30/1,001 Hz, 25 Hz, 24 Hz and 24/1,001 Hz. Part 2 of this standard specifies the Type D-11 picture compression and data stream format. Part 3 of this standard specifies the Type D-11 data stream and AES3 data mapping over SDTI.