With more and more monitoring practitioners, for newcomers who have just joined this industry, they may first start with the installation of the most basic equipment, gradually accumulate experience in practice, and become project managers who can independently take charge of projects. Then video surveillance What problems should be paid attention to during system installation?
With the improvement of people's living standards, the awareness of personal and property safety has also increased. When installing a security monitoring system, there are many points that need attention. The following are eight basic principles:
1. Real-time performance: The real-time performance of the monitoring system is particularly important. It is precisely because of the real-time nature of the monitoring system that the monitoring system is so necessary.
2. Security: The monitoring system has security precautions and confidentiality measures to prevent illegal intrusion into the system and illegal operations.
3. Scalability: The monitoring system equipment adopts a modular structure, and the system can be conveniently and flexibly expanded on hardware and software when the monitoring scale, monitoring objects, or monitoring requirements change, that is, there is no need to change the structure of the network and the main hardware and software equipment.
4. Openness: The monitoring system follows the principle of openness, and the system provides interfaces and tools in various aspects such as software, hardware, communication, network, operating system and database management system that meet international standards, so that the system has good flexibility and compatibility , scalability and portability. The whole network is an open system, which is compatible with the products of many monitoring manufacturers and can support secondary development.
5. Standardization: The equipment and technology used in the monitoring system conform to international general standards. This can give you a guarantee of peace of mind.
6. Practicability: The video surveillance system has the ability and standard to complete the functions required in the project. The system conforms to the requirements of the relevant domestic and foreign specifications that are actually required by the project, and is easy to implement and easy to operate. From the user's point of view, make full use of existing resources, reduce system costs as much as possible, and make the system have a high performance-price ratio.
Problems that cannot be ignored in the installation of monitoring system
1. Location requirements
For surveillance cameras, the location is directly related to the imaging effect of the equipment. Therefore, many users regard the monitoring effect as the primary reference for the installation location of the surveillance camera. When installing in an indoor environment, we must try our best to ensure that the height of the equipment is not lower than 2.5 meters, and in an outdoor environment, we also need to place the monitoring equipment at a height of more than 3 and a half meters from the ground. Otherwise, whether it is from the perspective of camera self-protection or equipment monitoring, it will have a lot of negative effects.
2. Installation angle
There are two main types: cylindrical and hemispherical. Among them, the cylindrical type is more common and can be used indoors and outdoors; the hemispherical type is generally used indoors and has a small volume, which can be wall-mounted or ceiling-mounted.
The installation of surveillance cameras should also pay attention to the angle problem. For ordinary cameras without wide dynamic function, direct light source should be avoided, and it is best not to install against the light. The principle and method of camera backlight compensation adjustment. The surveillance camera must be firmly fixed during installation to prevent the screen from shaking. For the wall, you can use an impact drill to drill holes, plug the plug, and then use self-tapping screws to fix the bracket on the wall. For the ceiling, you can put wooden blocks on it, let the self-tapping screws go through the ceiling and screw into the wooden blocks, and then use self-tapping screws to fix the bracket on the wall. There is a key problem: the choice of camera mounting bracket should also be paid attention to.
3. Installation height
The installation height of the surveillance camera should not be too low to prevent malicious damage by others, and it should not be too high, which is inconvenient for future maintenance. It is recommended that the installation height be three or four meters, which can be obtained by stepping on a ladder. The camera must take into account the post-maintenance aspects.
4. Electricity safety
Surveillance cameras need to be powered separately. When connecting strong currents, you should also pay attention to safety. You can use a multimeter and a tester to test first to ensure that the power is turned off before reconnecting. There is also an outdoor surveillance camera installed. For waterproof treatment, it is best to buy a network surveillance camera with a waterproof tail. In addition, a small waterproof box can be installed under the surveillance camera, and the power supply and connectors can be placed in the waterproof box.
Pay attention to lightning protection. In areas that are prone to lightning strikes, surveillance cameras must be protected against lightning strikes. Video lightning protection modules and power modules can be used for lightning protection.
5. Requirements for lighting environment
When using surveillance cameras at night, in order to avoid reflections and shadows, lighting equipment is usually required, and infrared lighting can be used instead of ordinary light bulbs. However, users must use black and white surveillance cameras and network surveillance cameras with infrared lighting equipment, because black and white surveillance cameras are more sensitive to infrared light, while color surveillance cameras cannot play infrared functions. We try our best to keep the camera in a "smooth light" mode, but in any case, we must avoid direct stimulation of the camera lens by strong light for a long time.
If you want to monitor at night, you must use an IPC with good night vision. The night vision distance is mainly determined by the number of infrared lights. The night vision distance of single light is 30 meters, and the night vision distance of double lights is 50 meters.
6. Switch selection
For more than 8 points (including 8 points above 720P), please use a full Gigabit network switch.
The actual bandwidth of our commonly used switches is 50%-70% of the theoretical value, so the actual bandwidth of a 100M port is 50M-70M. 4M*12=48M, so it is recommended that a 100M access switch be connected to a maximum of 12 720P IP cameras. At the same time, considering that the current network monitoring adopts the dynamic encoding method, the peak value of the camera code stream may exceed 4M bandwidth, and at the same time consider the bandwidth redundancy design, so it is best to control a 100M access switch within 8, and it is recommended to use more than 8 gigabit port.
7. Make a backup
Before construction, it is necessary to uniformly modify and register the IP addresses of all network ball cameras, network cameras, NVRs, computer hosts, storage servers, streaming media servers, high-definition decoders, management servers, etc. The original devices (such as computers, network printers) in the local network have IP address conflicts.
8. Do a good job of registration
All devices in the network system (including the original devices) should not be set to automatically obtain IP addresses, all IP addresses must be manually set and registered in the form.
9. Pay attention to IP
If there is a wireless router in the network system, please pay attention to whether there is a conflict in the IP addresses of the mobile phones and tablets connected to the wireless network system.
The above are some questions that need to be asked during the installation process of the video surveillance system. I hope it will be helpful to everyone.