About FSN System Card
The System card provides the FSN's reference timing signals, plus connections for GPIO and 24 Tally outputs. The Ethernet and serial communication connectors also reside on the card.
Three connections are provided for reference:
- Reference Input: The system accepts bi-level and black burst for SD, and tri-level for HD with status reporting. If the external video reference is lost, no visual artifacts on FSN video outputs will occur.
- Reference Output: The system outputs bi-level and black burst for SD, and tri-level for HD. The signal can be vertically locked to external video reference, or free run.
- Reference Loop: The looped reference input signal is present on the connector, even if the system card is removed.