The Merging Technologies CON-D15-VTC is a sync breakout cable for the Horus/HAPI MKII.The Sync Cable (optional with each Hapi unit) is a DB15 cable that connects to the "SYNC" port on the rear of the Hapi unit. The SYNC cable provides connectivity for LTC and Video Reference Input and Output for the Hapi unit. To attach this cable to the Hapi unit, align the male connector with the female DSUB port on the module. Then, with slight pressure, guide the connector into place. Once the cable has been pushed into place, fasten the mounting screws on either side finger-tight. Note: The Hapi provides Video Reference I/O Synchronization, but is not a Video reference Generator.