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The BNC call monitor connector allows users to connect the DRT16 / DRT8 DVR with an optional call monitor. Video Input A group of BNC connectors are available for video input streams from installed cameras. The number of connectors is equal to the number of channels; the DRT16 / DRT8 DVR has 8/ 16 BNC connectors on the rear panel, respectively. Video Looping Plenty of BNC connectors are positioned on the real panel for looping out the video input. Alarm I/O & RS485 The unit provides an alarm I/O