Component video sync

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Component video requires an extra synchronization signal to be sent along with the video. Component video sync signals can be sent several different ways:

Separate sync: Uses separate wires for horizontal and vertical synchronization. When used in RGB connections, five separate signals are sent (Red, Green, Blue, Horz. Sync, Vert. Sync).
Composite sync: Combines horizontal and vertical synchronization onto one pair of wires. When used in RGB connections, four separate signals are sent (Red, Green, Blue, Sync).
Sync-on-green: Combines composite sync with the green signal in RGB. Only three signals are sent (Red, Green with Sync, Blue). This synchronization system is used in - among other applications - many systems by Silicon Graphics and Sun Microsystems through a DB13W3 connector.
Sync-on-luminance: Similar to sync-on-green, but combines sync with the luminance signal (Y) of a color system such as YPbPr. This is the synchronization system normally used in home theater systems.