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Question:

What is the black box that monitors the camera connection?

What is the black box that monitors the camera connection?

Answer:

DVR is usually used analog (DVR) and network (NVR) two, look at the interface behind the fuselage can distinguish. DVR according to a few video input will have several BNC input interface, NVR is not.
Optical (transmitter) is the camera output of the electrical signal is converted to optical signals, through the fiber to the signal transmission to the control room, and then (the receiver) will be converted to electrical signals into electrical output to the hard disk video recorder.
As the name implies, the power adapter is used to power the device, the mains 220V input DC12V or AC24V output;
There may be a power adapter, there may be Guangduan Ji, there may be a video distributor, there may be a screen splitter, there may be a hard disk video recorder, do not know which one you say.

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