SMPTE RP 168-2002

This practice defines the line number and line timing for the switching point of serial degital and analog interfaces carrying television and data payloads to minimize any disturbance in the active payload area. The switching point location is defined for uncompressed television interfaces operating with composite or componenet signals, where the payload signals may be in analog or digital format. In addition, the same switching point location is used when the payload signals are data. This practice applies to equipment that uses an external reference signal to time switching as well as equipment which does not.