Matrox Helios Series Installation And Hardware Reference page 36

36 Chapter 2: Hardware installation
System reset
connector
Internal
Auxiliary I/O
connector
Analog
Video Input
Connector #1
Connector #0
You can use the Matrox DVI-TO-8BNC/O cable to connect to your video sources.
The cable has a DVI connector on one end and both 8 BNCs and open-ended
wires on the other end; the open-ended wires allow you to connect to some timing,
synchronization, and control signals of the frame grabber. Two of these cables are
required to connect to more than 4 video sources.
External
Auxiliary I/O
Connector #0
Connector #1