AJA FS1 Version 2.2.2.1 - Manual (Page 27)

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17 FS1 Installation and Operation Manual — Connectors
Reference Video (looping)
These two BNC connectors allow you to synchronize FS1 outputs to your
house reference video signal (blackburst or Tri-level for HD). If you have a sync
generator or video equipment source to use for synchronizing other video
equipment in your studio, connect its composite output here. When the FS1
outputs video, it locks to this reference signal. Reference video does not need
to be the same format as the video input/outputs, but it must have the same
vertical rate (for example, 1080i Tri-level reference video will work for 525
video input and output).
Examples of permissible reference video signals:
• 525 Color Black
• 625 Color Black
• 1080i Tri-level Sync
• 720p Tri-Level Sync