Optical Transmission Technology In The “hd” Monitor And Control System
With the rapid development of video monitoring technology, customer demand for video surveillance products have also been improved, more complete functional requirements, stability, and performance requirements more clear and accurate. At the same time, in shopping malls, banks and other important places to see the monitor a person’s facial features? How to look at a high-speed vehicle license? Noisy crowded railway station, stadiums, squares and so on, how to find the target quickly and accurately … …? These are video surveillance product problems to be solved. “Let us see more clearly”, this is the number of users in the use of video surveillance systems made by a very urgent need.
Typical video surveillance system consists of front-end and back-end equipment, the two major components, including back-end equipment can be further divided into the central
Control Equipment And sub-control equipment. Before the back-end equipment, a variety of construction method of the links between them (also known as transmission system) can be coaxial cable, optical cable, wireless or microwave and other means to achieve. Video image transmission system is the system signal path, a good video surveillance video transmission design is a very important part of the system. If a building is a good system of choice to produce or deal with high-quality picture
Video camera , Lenses, monitors, VCRs, but without good transport system, the final image on the monitor that will be unsatisfactory. According to “barrel rule”, the final image quality will depend on the worst part of the system, which is often the worst part of transmission system. System designers and installers must be based on actual need to select the appropriate transfer mode, high-quality transmission cables and equipment and professional
Standard Installation, to achieve the desired transmission.
Monitoring system transmission technologies include baseband video transmission, optical transmission, network transmission, microwave transmission, twisted pair balanced transmission, cable transmission a total of six broadband transmission. Each transmission technology has its own characteristics, have their own application level, for a complex control systems are often based on different distance, different monitoring requirements, different transmission. Baseband video transmission is the most traditional
TV Control transmission, direct modulation to baseband frequency (about 8MHz bandwidth) in the form of direct transmission through the coaxial cable analog video signals. The advantages are: short-distance transmission image signal loss, low cost. Disadvantages are: the short distance, 300 meters above the high frequency attenuation of a larger, can not guarantee image quality; way be laid a cable video signal transmission control signal cable laid separately; the structure of star structure, wiring capacity, maintenance difficulties, poor scalability. However, to solve the long-distance transmission using optical fiber transmission system of video surveillance best solution, through the video and control signals are converted to optical signals in optical fibers. Optical transmission with low attenuation, frequency bandwidth, from electromagnetic interference, light weight, good range of benefits of confidentiality are widely used in the backbone of the national and provincial and municipal communications networks, cable networks and high-speed broadband computer network. In the video surveillance system, has become a long-distance optical fiber transmission audio and control signal transmission method of choice. But the fiber-optic transmission technology required specialized staff and equipment maintenance of fiber optic fusion of work, and close monitoring for signal transmission is not enough economic.
Fiber transmission system on the sea
In today’s high-definition camera system monitoring applications, the cable connection in the way of all the bandwidth to provide the best performance of a way. The use of optical fiber transmission system, the system’s image quality is limited only by the camera,
Environment And monitor these three factors. The optical fiber transmission system can transmit images to a screen very far away will not signal any kind of distortion, not to detract from the clarity of the image frame or details. Meanwhile, video surveillance developments in digital technology to use IP to Ethernet network system using low cost and the advantages of digital transmission technology, and have to expand with other
Security System interoperability linkage capabilities. Large park in the optical transmission system, if necessary to the building of two or more
Communicate Interconnection link up, usually in outdoor fiber optic cable laid between buildings. It consists of connected buildings, the main trunk cable, wire cable, optical cable transfer box, cable, wiring equipment and cords. When in program planning and design, according to complex interrelated features, the use of optical fiber is divided into indoor and outdoor fiber optic cable and optical fiber types, such as between two or more buildings or transit corridor through the skirt connected Users can adopt within the cable, otherwise you must use overhead or buried cable to connect outside. Optical fiber transmission system is the lifeline of the whole monitoring system.
The same time, the actual construction of optical fiber transmission system in order to achieve the main cable to optical distribution node of the connection, allocation and scheduling, to monitor the transmission system to provide safe and reliable, flexible optical fiber and cable management equipment, cable transfer of equipment relatively many will use the optical cable transfer box. Cable transfer box is a kind of backbone cables, wiring cables to provide fiber optic cable into the side, jump then the transfer of equipment. After the introduction of optical cable transfer box, fixed, welding, wiring, use the fiber optic backbone cable and wiring jumper to cable directly connected.
Network topology for the diversity and complexity, will inevitably bring the increase in the number of fiber optic cable. The traditional solution would be between the buildings will be installed in all new cable, but this program will bring the increase in construction volume, the user investment. For this situation, we can consider the use of optical fiber, “cross-connect” method to achieve fiber connection between the different buildings. Connect different buildings can also connect them to other buildings in the same cable, through cross-connections, cable transfer box in the use of an optical fiber jumper for the most flexible connectivity.
Optical cross-connect mode
Can be seen, although the increase in cross-connection of a connection point, but the management of cross-connections with the convenience and reliability is unmatched by the interconnection link. Use of cross-connection, both ends of the connection cable can be fixed and, as a permanent connection. When you need to move, add and change, the maintenance personnel only need to change the jumper between the patch panel. For the transmission system at the heart of fast recovery, reduce misuse and to ensure the normal operation of port facilities as the most basic requirements of the environment, cross-connect is undoubtedly the best selection
I am an expert from China Manufacturers, usually analyzes all kind of industries situation, such as precision drill press , cordless electric drills.
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