Q-See Computer Hardware - Manual (Page 13)

SuperDVR & H.264 Series Cards
User Manual
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PIN1 VIDEO-1 PIN9 GND
PIN2 GND
PIN10 AUDIO-1
PIN3 VIDEO-2 PIN11 AUDIO-2
PIN4 GND
PIN12 AUDIO-3
PIN5 VIDEO-3 PIN13 AUDIO-4
PIN6 GND
PIN14 NULL
PIN7 VIDEO-4 PIN15 GND
PIN8 GND
Figure2-5 Definition of Audio and Video Connector’s Pins
When there are multiple QSDT4PCRP cards connected together, please
connect the lines as in the following figure:
Figure2-6 Multi-Card Connection