I-View Digi-4800XP 16 channels Hybrid Embedded DVR - Manual (Page 18)

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12.
Video loop output: The optional 16 (1-16) cameras video loop
13.
Video in: 1-16 cameras video input.
14.
Sensor input: 16 sensors input. (For Dry contact input only)
15.
Main Spot Monitor 0 output: Display 1-16 split video on TV.
16.
Video out: Display 1-16 single video output.
17.
Relay output: 3 relay output.
18.
Audio input: 1-16 audio input. (For Digi-1648 Pro-A only)
19.
Spot Monitor 0 output: The optional 16 (1-16) Spot Monitor 0 output. (Option)
The video looping video cannot be used when add the Spot monitor video out.