Why my HD-TVI camera has 2 BNC out one black other gray

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Why my has 2 BNC out one black other gray

The Gray BNC Is a TVI Connection

The black BNC is an Analog connection

and the switch cables are designed for toggling status of the WDR functions for 1080p cameras. The WDR function is disabled by default, and you can short the white and black line-ends of the switch cable to enable the function.