Selection of monitoring installation
Common line transmission method for monitoring installation
system: fiber transmission
Commonly used in this transmission mode are analog optical transceivers and digital optical transceivers. It is the best solution for tens or even hundreds of kilometers of television monitoring transmission. It converts video and control signals into laser signals for transmission in optical fiber.
Advantages: the transmission distance is relatively long, the attenuation is relatively small, and the anti-interference ability is the strongest, which is suitable for long-distance transmission. The standard optical transceivers have a transmission distance of 0-20 kilometers. Among them, 8-channel optical transceivers are the most cost-effective. This has a certain relationship with the optical head. Friends who have experience in optical transceivers know that the current optical transceivers are very cheap, but the quality is still very good. expensive.
Disadvantages: It is not economical to transmit monitoring signals within a few kilometers, which is easy to cause waste; professional technical personnel and equipment operation and maintenance processing requirements for optical welding and maintenance are high, and it is not easy to upgrade and expand capacity. In order to save some cheap optical jumpers and flanges, some engineering personnel have directly connected the pigtail to the equipment, which will make you miserable when repairing in the future. Monitoring
transmission system common line transmission method 2: network transmission
This transmission method is a monitoring transmission method that solves the long distance between cities and extremely scattered points. It uses MPEG2 / 4 and H.264 audio and video compression formats to transmit monitoring signals.
Advantages: Adopting a network video server as the monitoring signal uploading device, and having remote monitoring software installed on the Internet network can perform monitoring and control, which is very convenient.
Disadvantages: It will be limited by the network bandwidth and speed. It can only transmit small images and low-quality images; it can only transmit a few to a dozen frames per second. The animation effect is very obvious and there is a delay. There is no way to do real-time monitoring. But nowadays, the network broadband transmission speed is very high, which can solve this problem well.
Common line transmission mode three for monitoring installation
system: twisted pair transmission (balanced transmission)
This transmission method is also a type of video baseband transmission. It converts the 75Ω unbalanced mode to a balanced mode for transmission. It is used to solve the problem of transmission of monitoring images within 1 km and one of the solutions in complex electromagnetic environments. The monitoring image signal is transmitted in a balanced and symmetrical manner.
Advantages: easy wiring, low cost, strong resistance to common mode interference.
Disadvantages: It can only solve the transmission of surveillance images within 1 km, and a twisted pair can only transmit one channel of images, which is not suitable for large and medium-sized surveillance; and the twisted pair is weak in texture and anti-aging ability, so it is not suitable for Transmission in the field; in addition, the transmission of high-frequency components of the twisted pair cable has a relatively large attenuation, and the color of the image will be greatly lost.
Dongguan Xincheng Intelligent Engineering Co., Ltd. recommends that when selecting a monitoring installation system, the most economical and effective construction and installation method should be selected in combination with the site conditions of the monitoring installation project.
Mr. Yu 13925706128