Industry Overview

In recent years, with the rapid development of social production, many social hazards have also emerged. How to ensure the safety of the people is a problem that we should pay attention to, and how to build a socialist harmonious society deserves the attention of relevant departments. To address these issues, Safe City has been put on the agenda as an important part of the "3111 Project". The scale of building a safe city is generally large and has a wide coverage. The main streets, intersections, enterprises, shopping malls, schools, important places and other locations in the city need to be monitored and centrally managed, and need to be monitored 24/7, so the monitoring system will face the challenge of large capacity storage. 
System Composition

The monitoring of a safe city can be divided into two or three levels of monitoring centers based on the size of the city. Each monitoring center can be divided according to the administrative region, economic situation, and public security situation of each place. Each level of monitoring center can forward, replay, and manage the monitoring information it belongs to. 
1. The three-level monitoring center is generally established by local police stations, mainly monitoring local road sections, residential areas, office buildings, schools and other alarm monitoring equipment. 
2. The secondary monitoring center is established in the higher-level department of the tertiary monitoring, which can be the alarm monitoring center of the public security bureau. The second level monitoring mainly manages the third level monitoring center, manages the third level monitoring system, and can also directly receive alarm monitoring equipment in the local area and manage it uniformly with the third level monitoring center. 
3. The first level monitoring center is the highest level monitoring and command center in a city, usually located in the city's first level alarm monitoring center. This level of monitoring center has the highest authority for urban monitoring and can directly monitor and manage monitoring equipment within the third, second, and local areas. Due to the fact that the primary monitoring center is the highest center for urban monitoring, this level requires not only capacity, but also high security and powerful scalability. Because the data uploaded to the first level is important data for each monitoring center, the required security level is also the highest. Scalability is particularly important at this level. With the increase of front-end monitoring equipment at all levels and the establishment of new monitoring centers at all levels, the storage pressure borne by the first level monitoring center will increase. When planning for monitoring together, it is necessary to consider this, otherwise the cost of storage expansion in the later stage will be quite huge. 

industry characteristics
1. The monitoring scope is wide, the distance is far, and the monitoring points are densely distributed. 
2. Remote monitoring points are generally installed on lamp posts at intersections. When it is not possible to install it on the lamp post, it can also be installed on the wall of the attached residential building. 
3. Due to the strict geographical location of cities and tall buildings, there is often obstruction between monitoring points and monitoring centers, making it difficult to see. Therefore, relay points are generally chosen to be installed at the highest point to ensure the stability of the wireless link. For example, TV towers, bank buildings, and operator buildings. At the same time, the bandwidth requirements for the relay link are relatively high, so point-to-point devices can be used to form the backbone link to ensure the stability of the wireless link and the smoothness of the image. 
4. The urban wireless environment is complex and has significant interference. You can choose a hybrid networking mode of 2.4G and 5.8G. 
5. High requirements for transmission quality and real-time performance. To ensure the maximum possible image quality while maintaining low latency in video transmission, different monitoring devices and video resolutions should be adopted for different application scenarios. 
6. Select the video stream transmission method based on the different image viewing methods (single client, multi client) of the monitoring center. When multiple clients need to view images, multicast should be used to save wireless link bandwidth and prevent congestion. At this point, switches in monitoring centers at all levels must have multicast forwarding control functions to prevent broadcast storms. 
7. The safe city monitoring system can be jointly used by departments such as public security, transportation, and government, thus integrating multiple networks such as the public security network, transportation network, and government network. Not only does it save costs, but it also improves efficiency.
 
Due to the large number of monitoring points, the management of equipment by the monitoring center is particularly important. It is best for all wireless devices to be managed uniformly and clearly by specialized management software.