1, according to the requirements of the system construction drawings
Before the construction of the dome camera, construction preparations shall be made according to the requirements of the system construction drawings formulated by the site environment and customer needs.
2, transmission method
The contractor can use different transmission methods depending on the number and distribution of the cameras. If it is within close range (within 3 km), the transmission method of the coaxial cable can be used, but due to the limitation of the length of the coaxial cable itself, in order to achieve For a longer distance, a cable compensator can be added, which can increase the effective distance by about 2-3 kilometers, and the cable compensator can not be cascaded in an infinite number, at most 2-3, otherwise the video transmission quality cannot be guaranteed. It is also possible to add video amplifiers. It is recommended that one of the video amplifiers be placed near the monitor; it cannot be cascaded indefinitely.
If the distance is more than 3 kilometers, it is better to use fiber optic cable. If it is far from easy to lay, you can use wireless transmission. Wireless transmission can be divided into high-frequency open-circuit transmission and microwave transmission. If the distance is within 10 kilometers, it can be transmitted by high-frequency open circuit, and it can be transmitted by microwave. If there is a barrier, and the transmission is affected, microwave repeaters can be added. . In addition, it should be noted that if it is a medium- and large-scale system, it is better to use fiber optic cables in the main line to avoid the phenomenon of processing in the center, such as the video is not real-time.
3, the choice of wire
When selecting wire, try to choose quality guaranteed. Do not buy small-quality wires for small amounts of money. This leads to unexpected problems. If you delay the project, you will end up losing your wife and you will lose more.
The contractor can use different wires depending on the situation. For example, SYV-75-9 is used for outdoor lines, and SYV-75-5 can be used if the room does not exceed 500 meters. Single-mode optical cables are used for long-distance cables; multi-mode optical cables are used for short distances. Can use twisted pair according to the appropriate distance, compared with the coaxial cable, the price is cheaper. This can save costs and cause unnecessary waste.
4, wiring
The wiring design can be based on the relevant provisions of JBJ16-83 "Construction Electrical Design Technical Specifications" and GBJ42-81 "Industrial Communication Design Specification". The cable lines, control lines and power lines shall be separately installed and laid, and the distance between the cable lines and the power lines shall not be less than 0.3 meters. The non-metallic pipe used in wiring, trunking, etc. should be made of non-combustible materials. If the interference is strong, the cable runs through the metal pipe and is buried underground. The wiring should be straight, not in harsh environments, and should not cause kinks, circular joints, etc., and should not be squeezed and damaged by external forces. Do a good job of wiring labels system, the label at least 10 years warranty period. The wiring must be beautiful, concealed and safe, and the signal transmission needs to be stable and reliable. The circuit design is as easy as possible for inspection and inspection.
5, power supply
The camera- powered power supply can generally be divided into: DC12, AC12, AC220. If the DC or AC voltage fluctuation exceeds ±10%, a DC or AC regulated power supply should be used, and the power of the power supply should be 1.5 times the total power of the system. The system power supply mode can be divided into two types: one is centralized power supply, that is, the power supplies all refer to one place, and the other is distributed power supply, that is, taking power from the vicinity of the camera installation, taking into account the anti-jamming and distance, and centralized power supply. The way is better, because distribution power supply is prone to potential inequality. When the individual cameras are far away from the control room, local power can be used.
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Before the construction of the dome camera, construction preparations shall be made according to the requirements of the system construction drawings formulated by the site environment and customer needs.
2, transmission method
The contractor can use different transmission methods depending on the number and distribution of the cameras. If it is within close range (within 3 km), the transmission method of the coaxial cable can be used, but due to the limitation of the length of the coaxial cable itself, in order to achieve For a longer distance, a cable compensator can be added, which can increase the effective distance by about 2-3 kilometers, and the cable compensator can not be cascaded in an infinite number, at most 2-3, otherwise the video transmission quality cannot be guaranteed. It is also possible to add video amplifiers. It is recommended that one of the video amplifiers be placed near the monitor; it cannot be cascaded indefinitely.
If the distance is more than 3 kilometers, it is better to use fiber optic cable. If it is far from easy to lay, you can use wireless transmission. Wireless transmission can be divided into high-frequency open-circuit transmission and microwave transmission. If the distance is within 10 kilometers, it can be transmitted by high-frequency open circuit, and it can be transmitted by microwave. If there is a barrier, and the transmission is affected, microwave repeaters can be added. . In addition, it should be noted that if it is a medium- and large-scale system, it is better to use fiber optic cables in the main line to avoid the phenomenon of processing in the center, such as the video is not real-time.
3, the choice of wire
When selecting wire, try to choose quality guaranteed. Do not buy small-quality wires for small amounts of money. This leads to unexpected problems. If you delay the project, you will end up losing your wife and you will lose more.
The contractor can use different wires depending on the situation. For example, SYV-75-9 is used for outdoor lines, and SYV-75-5 can be used if the room does not exceed 500 meters. Single-mode optical cables are used for long-distance cables; multi-mode optical cables are used for short distances. Can use twisted pair according to the appropriate distance, compared with the coaxial cable, the price is cheaper. This can save costs and cause unnecessary waste.
4, wiring
The wiring design can be based on the relevant provisions of JBJ16-83 "Construction Electrical Design Technical Specifications" and GBJ42-81 "Industrial Communication Design Specification". The cable lines, control lines and power lines shall be separately installed and laid, and the distance between the cable lines and the power lines shall not be less than 0.3 meters. The non-metallic pipe used in wiring, trunking, etc. should be made of non-combustible materials. If the interference is strong, the cable runs through the metal pipe and is buried underground. The wiring should be straight, not in harsh environments, and should not cause kinks, circular joints, etc., and should not be squeezed and damaged by external forces. Do a good job of wiring labels system, the label at least 10 years warranty period. The wiring must be beautiful, concealed and safe, and the signal transmission needs to be stable and reliable. The circuit design is as easy as possible for inspection and inspection.
5, power supply
The camera- powered power supply can generally be divided into: DC12, AC12, AC220. If the DC or AC voltage fluctuation exceeds ±10%, a DC or AC regulated power supply should be used, and the power of the power supply should be 1.5 times the total power of the system. The system power supply mode can be divided into two types: one is centralized power supply, that is, the power supplies all refer to one place, and the other is distributed power supply, that is, taking power from the vicinity of the camera installation, taking into account the anti-jamming and distance, and centralized power supply. The way is better, because distribution power supply is prone to potential inequality. When the individual cameras are far away from the control room, local power can be used.
Click to view our camera products
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