BNC interface protocol in video output

In the following, you will be presented with a set of questions and answers about the "What protocol is going on in the BNC interface video output" and the Konnra Electronics engineers' Q&A record, so that you can easily understand what protocol is going on in the video output of the BNC interface in the interaction. related question.
BNC connector
The core of the problem:
What protocol is going inside the BNC interface video output?
Problem Description:
For example, this bnc interface video output device, BNC is the signal of the H.264 protocol, it is necessary to configure the photoelectric conversion equipment between it and the camera, how to configure it? What kind of docking can it be?
Answer:
The BNC interface input and output is commonly referred to as the Q9 header, which is used to transmit baseband video signals. The single BNC port of the monitoring device transmits the analog composite signal. The video recorder saves the video file of the analog video signal into CIF (352X288) or D1 (PAL 720X576 or NTSC 720X480) with H.264 encoding and saves it on the hard disk.
Question:
The camera is out of the BNC port, is it an analog signal? Is it possible to add a photoelectric conversion device between the camera and the recorder to extend the transmission distance? What kind of photoelectric conversion equipment needs to be purchased? For example, the following device, "16 channels of video + 2 channels of bidirectional data How to understand +100M Ethernet optical transceiver. Transmission optical transceiver Aussie ASV8F01EWT/R 16-channel video + 2 bidirectional data + 100M Ethernet optical transceiver with network management function (20km).
Answer:
At present, the cameras used for monitoring are all analog signals, and a video cable of 75 ohms - 3 or -5 can be used. Video amplifiers can be added over 200 meters. But not more than two. Generally, the optical camera is used for transmission when the remote camera is more than 800 meters away from the control center. "16 channels of video + 1 channel bidirectional data + 100M Ethernet optical transceiver" means that the optical transceiver can connect 16 cameras, digitize 16 analog video signals, and transmit them on a single core fiber. At the same time, it can also transmit one-way bidirectional control data (such as 232 or 485 control signals to control the PTZ and other devices). It is useful to connect the 100M Ethernet interface to the LAN via fiber optic. The optical transceiver with the network management function can be configured by the network cable to connect the optical transceiver.



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