Serves as a reference for manufacturers that wish to make disks or players compatible with the optical system described in this standard. Applies to pre-recorded optical reflective videodisks compatible with 50 Hz/625 lines CCIR monochrome and colour coding PAL systems. Also defines the parameters that affect the interchangeability of the disk, excluding limitations of the programming material and source. Includes sections on: Disk Parameters, Recorded Parameters and Operational Signals.