Coaxial video signals commonly used in surveillance systems are introduced:
Composite-Video, also known as AV or CVBS, transmission media: single shielded coaxial cable, transmission impedance: 75 ohms, connection standard: pin = coaxial signal line, housing common ground = shielded network cable, Physically, the composite video terminal has "core" and "skin". The "core" transmits a composite video signal, and the "skin" is the terminal housing (grounding, anti-interference).
Composite video There are two common interfaces, namely RCA terminal and BNC terminal: RCA terminal is commonly known as the lotus head and lotus seat, BNC terminal is the BNC head and BNC seat. BNC terminals are commonly used in monitoring and have the characteristics of stable connection and strong anti-interference.
Composite-Video Coaxial transmission distance and transmission material description:
75-3 coaxial line (about 100 meters) transmission distance
75-5 coaxial line (about 300 meters) transmission distance
75-7 coaxial line (about 500--800 meters) transmission distance
75-9 coaxial line (about 1000 --- 1500 meters) speed transmission distance
75-12 coaxial line (about 2000----3500 meters)
SYV75-3 transmission is effective within 300 meters.
SYV75-5 transmission better than 800 meters.
Note:
75 stands for resistance, followed by 3 and 5 for its insulating outer diameter (3mm/5mm).
SYV S-coaxial RF cable, Y-polyethylene, V-PVC.
The status of common monitors for Composite-Video signals:
Composite-Video signals are transmitted through the back-end of the coaxial cable and need to be displayed or acquired using a monitor or hard disk recorder. However, the current production of the monitor is low, the production cost is high, and the power consumption is large. The sex is not strong, so it is necessary to replace the monitor with a VGA LCD monitor.
Composite-Video monitor replacement scheme introduction:
The original method: Surveillance cameras transmit to the monitoring room through the coaxial cable, the signal is sent to the picture splitter, and the splitter output composite video is displayed on the monitor.
The new scheme is replaced: Surveillance cameras transmit to the monitoring room through the coaxial cable, the signal is sent to the picture splitter, the splitter outputs the composite video through the BNC to VGA composite video converter (AV-216BNC), and the BNC to VGA composite video converter outputs the VGA Signals, surveillance video will be displayed on the VGA LCD monitor, and another BNC to VGA converter outputs a loop-through signal to the hard disk recorder.
The new program features: It will have the advantages of convenient display equipment purchase, low cost, flexible video surveillance, and good display effect.
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