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The image of the front-end camera in the large-scale monitoring system must be transmitted through the optical fiber so that the large-area monitoring image can be transmitted to the monitoring center. The monitoring systems of other industries also use a large number of cameras, video optical transceivers, and so on.
The cameras and optical transceivers in the surveillance system are often installed on poles that are three or four meters away from the ground, or hung on the wall, which inconveniences the installation, debugging and maintenance of the domes. If construction personnel or maintenance personnel are standing at a height of 34m, they must also carry small monitors, multi-function keyboards, multimeters, or laptops for commissioning and testing, and these devices must be connected to external AC power. This kind of construction and maintenance environment exists. Certain risks and inconveniences, work efficiency is relatively low.
For the installation and maintenance of front-end cameras and video optical transceivers for video surveillance systems, as well as integrated applications such as strong electricity measurement, equipment maintenance, and cabling engineering, Guangzhou Postsoft has developed the STest-895 portable video surveillance integrated tester. The equipment is compact, easy to use, and converged. Lithium battery power supply, no external power supply can work for 12 hours. With the handheld video monitoring integrated tester, construction workers no longer need to carry small monitors, multi-function keyboards, multimeters and other tools, which provides great convenience for the construction and maintenance of security engineering companies. "Security Engineering Po."
Video surveillance system installation and maintenance
In the video surveillance system, since each surveillance point is located in a different location, it takes a lot of manpower and time to install front-end cameras (fastballs), transmission equipment, and auxiliary transmission lines, and how to quickly detect and maintain equipment and transmission lines, saving The maintenance cost is a headache for the contractors. For the maintenance of the monitoring system, the monitoring equipment and transmission lines are usually overhauled. As shown in Figure 1. 
Camera maintenance
When the monitoring center fails to receive the image, the engineer must first detect whether the camera ball or the dome camera is normal. When detecting camera equipment, engineers use video monitoring comprehensive test instruments to do three aspects of detection: First, use the meter to test whether the camera has an image, the instrument's 3.5-inch color display can clearly display the image captured by the camera, if the meter does not receive The image or the received image is abnormal, indicating that the camera is faulty. Second, the video signal attenuation measurement using the monitor integrated tester is used to measure the camera's video complex level. The normal range is 800-1000mV, and the level is too low will cause the image to change. Dark, the level is too high will cause a virtual shadow; Third, use the instrument's multimeter to measure whether the camera's transformer power supply is normal, the general transformer output is DC 12V, the dome's transformer output is AC 24V, the transformer is the monitoring system failure rate comparison High accessories.
PTZ control and maintenance
In the security monitoring system, the pan/tilt or dome camera is widely used. The monitoring center staff can adjust the camera angle flexibly. When the pan/tilt or dome is out of control, or cannot be turned in a certain position, the engineer needs to carry the multifunctionality. The keyboard tests whether the pan/tilt or dome camera is rotating normally. However, different manufacturers of PTZ or dome cameras have their own proprietary protocols. When an engineering firm maintains a dome camera, it must bring with it a corresponding multi-function keyboard test. It may be necessary to bring multiple keyboards to test the use of different dome cameras. The engineering staff uses the video monitoring comprehensive tester to solve this problem, because it has embedded more than 30 kinds of protocols such as Pelco-D/P and BOSCH, and it is dedicated to testing the pan/tilt rotation testing function of the pan/tilt rotation. The personnel can rotate the instrument through the instrument and operate the PTZ to observe whether there is a card bit when the PTZ rotates. The PTZ platform produced by Guangzhou Post Technology Co., Ltd. uses a permanent-type heavy-duty magnetic synchronous motor, which has the functions of a PTZ stop protection function, a high-performance long-life imported component transmission, and horizontal automatic limit adjustment.
Video Optical Terminal Maintenance
The video optical transceiver is divided into a transmitting end device and a receiving end device. The transmitting end device is placed in the same place as the camera. The engineering personnel usually perform maintenance testing on the transmitting end device. For the repair work of the optical transceiver, it is tested in three steps. First, use a multimeter of the video monitoring comprehensive tester to measure whether the power supply of the optical transceiver is normal, and the general power input is DC 5V. Second, measure whether the optical output power of the optical transceiver is normal. The emission wavelength of the transmitter is 1310n and the received wavelength is 1510n. The optical transceiver of 20KM is used. The general transmission power is about -9dBm. Third, test whether the video port of the optical transceiver and the RS485/RS232 communication are normal. The monitoring and comprehensive tester sends the standard color image strip image signal to the video optical transceiver. The monitoring center receives the test color strip sent from the video optical transceiver to indicate that the video transmission is normal. The RS485/RS232 data capture function of the instrument is used to receive the control signal of the optical transceiver. If receiving the control code sent by the monitoring center, it indicates that the optical transceiver's RS485/RS232 communication is normal.
Optical fiber transmission maintenance
Optical fiber transmission has the characteristics of large capacity, high speed, and high stability. Video monitoring systems increasingly use optical fiber devices such as video optical transceivers and optical transceivers to transmit video images and control signals. Large-scale monitoring systems, such as highway monitoring and monitoring in safe cities, use optical fiber transmission to achieve highly stable video transmission. With the development of optical fiber communication technologies, the prices of video optical cables and optical fiber cables are getting lower and lower, and video monitoring systems use optical fibers. Transmission has become very popular. Optical fiber transmission is usually used for signal transmission between a few hundred meters to 100 kilometers, and detection of fiber optic cables is also an indispensable step. For fiber maintenance, engineers must use specialized fiber-optic test instruments such as light sources, optical power meters, and OTDRs. The stable light source is designed to emit laser light with a high stable power value. The laser light has a certain attenuation after being transmitted through the optical fiber. The power value after transmission through the optical fiber is measured by an optical power meter to calculate the loss value of the optical fiber. Measuring the time-consuming of the optical fiber must be matched with the light source and the optical power meter in order to prepare to calculate the optical fiber loss; and the OTDR is an instrument for measuring the position of the break point of the optical fiber. It detects how many kilometers the optical fiber is disconnected, but the cost of the OTDR is low. Too high, smaller contractors can use optical fiber barriers to measure breakpoints. For small-scale contractors, the most needed optical fiber measurement tool is the optical power meter. Because long-distance optical cables are usually maintained by telecommunication operators or broadcasting and television systems, small-scale engineers only need to measure the power and fiber loss of optical fiber equipment. Finding the problem is enough.
When maintaining optical fiber, engineers use the optical power measurement function of the monitoring integrated tester to switch to the corresponding wavelength to measure multi-mode and single-mode optical fibers. Optical-connected optical communication devices (such as video optical transceivers and optical transceivers) are normal. In this case, an optical signal will be emitted. If the meter does not receive an optical signal, -70dBm is displayed, indicating that the optical fiber is inaccessible. It is necessary to check whether the optical fiber jumper or the optical cable is disconnected or damaged.
Conclusion
The video monitoring and maintenance comprehensive tester is designed according to the cable transmission and practical application environment of the domestic video surveillance system, which can help engineers solve more practical problems. The use of comprehensive testers by engineers not only achieves the maintenance of cameras, domes, pan/tilts, video optical transceivers, BNC cables, optical fibers, etc., but also eliminates the need for frequent replacement of related test tools during high altitude operations, thereby increasing the number of engineers. The safety and efficiency of working at heights bring great convenience to the installation and maintenance of security monitoring.
Video surveillance system installation and maintenance
With the prosperity of economy and society and the rapid development of science and technology, the monitoring system can be said to be ubiquitous. The monitoring equipments of the optical transceivers and cameras are widely used in the monitoring systems. How to install the optical transceivers and how to maintain the normal operation of the optical transceivers in use. The optical transceivers are The efficient use of optical fiber transmission, Guangzhou Post will discuss with you one by one!
Figure 1 Installation and maintenance of the video surveillance system
Video surveillance system monitoring center equipment such as the matrix, video server, video wall, etc., is installed in the monitoring center room, the equipment is concentrated in a relatively good indoor environment, the monitoring center equipment failure rate is relatively small; and the front-end camera, fast The ball is installed outdoors, and the video optical transceiver is installed in the outdoor distribution box. The equipment is exposed to the harsh environment such as wind and rain, high temperature in summer and low temperature in winter, so the probability of failure is high. For the maintenance of the front-end monitoring equipment, it must be able to test the camera image, the image of the fastball, the PTZ control, the optical power of the video optical transceiver, and use a multimeter to test the power supply system, etc., so as to comprehensively solve the problem that the front-end equipment may appear faulty.