wire used to transport the green signal (SoG, Sync on G, or RGsB).
* Sync on red or sync on blue, where a composite sync signal is overlaid on either the red or blue wire
* Sync on composite (not to be confused with composite sync), where the signal normally used for composite video is used alongside the RGB signal only for the purposes of sync.
* Sync on luma, where the Y signal from S-Video is used alongside the RGB signal only for the purposes of sync.

Composite sync is common in the European SCART connection scheme