Timecode A User's Guide, 3rd Edition

Appendix 4The use of binary groups with film

Use of the binary groups to carry additional data as specified in SMPTE RP135-1990 is indicated by setting the flag bits as follows:

bit 43 of the type C code or bit 67 of the type B code to 0bit 59 of the type C code or bit 83 of the type B code to 1.

As several types of additional data are specified, they cannot all be carried in one timecode frame. If the data were to be carried over a number of frames, the corruption of a single frame could result in the data being lost. The different types of data are each incorporated within a single frame, the specific type being paged by a code held within the frame.

In essence, the principle is that of a directory system, with Binary Group 1 of each timecode ...