Wireless Bridge Safe City Monitoring Solution

In recent years, with the rapid development of social production, many social hidden dangers have followed. How to ensure the security of the people is an issue that we should pay attention to. How to build a harmonious socialist society deserves the attention of relevant departments. In order to solve these problems, Safe City was put on the agenda as an important part of the "3111 Project."

The scale of the construction of safe cities is generally relatively large, covering a wide range. The major streets, intersections, businesses, shopping malls, schools, and important sites in the city must all be monitored and managed centrally, and all-weather monitoring is required. Therefore, the monitoring system will face the challenge of large-capacity storage.

System composition

The monitoring of a safe city can be divided into two-level or three-level monitoring centers according to the size of the city. Each monitoring center can be divided according to administrative regions, economic conditions, and security conditions. Each level of monitoring center can manage its own monitoring information such as forwarding and playback.

1. Three-level monitoring centers are generally established by local police stations to monitor the monitoring and control equipment in road sections, communities, office buildings, and schools in the region.

2. The secondary monitoring center is set up at the upper level of the three-level monitoring and can be the alarm monitoring center of the branch. The secondary monitoring mainly manages the three-level monitoring center and manages the three-level monitoring system. It can also directly receive alarm monitoring equipment in the region and manage it with the three-level monitoring center.

3, a monitoring center is the highest level of the city's monitoring and command center, generally set up at the city level of the alarm monitoring center. This level monitoring center has the highest authority of city monitoring and can directly monitor the monitoring equipment in the third, second and local areas. Since the primary monitoring center is the highest center of city monitoring, this level of demand is not only capacity, but also has high security and powerful expansion capabilities. Because the data uploaded to the first level is the important data of each monitoring center, the required security is also the highest level. Extensibility 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 pressures borne by the primary monitoring center will increase, and it is necessary to conduct a monitoring plan. Taking into account, the cost of non-secondary storage expansion is quite large.

Industry characteristics

1. It involves a wide range of monitoring, long distances, and intensive distribution of monitoring points.

2. The remote monitoring point is generally set up at the cross light pole. When it cannot be set up on a light pole, it can also be erected on the wall of the accessory residential building.

3. The geographical location of the city is more demanding and the buildings are taller, which often results in blockage between the monitoring point and the monitoring center and cannot be visualized. Therefore, the relay point is generally set to be set to the highest point to ensure the stability of the wireless link. Such as television towers, bank buildings, operator buildings. At the same time, the bandwidth requirements of the relay link are relatively large. Therefore, peer-to-peer devices can be used to construct the backbone link to ensure the stability of the wireless link and the fluency of the image.

4. The urban wireless environment is complex and the interference is large. LigoWave 2.4G and 5.8G hybrid networking modes are available.

5. Transmission quality and real-time requirements are high. The maximum possible guarantee of image quality is on the premise of ensuring low latency of video transmission. Different monitoring devices and video resolutions should be used for different applications.

6. Select the transmission mode of the video stream according to the different viewing modes (single-client, multi-client) of the monitoring center. When multiple clients need to view images, multicast should be adopted so as to save wireless link bandwidth and prevent congestion. At this point, the switches at all levels of the monitoring center must have multicast forwarding control to prevent broadcast storms.

7. The safe city monitoring system can be used jointly by departments such as the *, transportation, and government, so it is possible to integrate multiple networks such as *net, transportation network, and government network. That is to save costs and increase efficiency.

8. Because of the large number of monitoring points, the monitoring center's management of equipment is particularly important. All wireless devices are best managed by a dedicated management software at a glance.

User needs

1. When it is not economical and effective to deploy a wired solution, wireless broadband transmission means must be used to quickly implement image surveillance at key intersections, high-traffic commercial areas, streets, squares, residential areas, and events, conferences, and other areas.

2. The data bandwidth is stable, and the uplink capacity is large enough for image transmission, especially high-definition real-time images

3. Because they are basically located in urban areas or in central areas, they need to overcome interference

solution

Using LigoWave 5.8GHz point-to-multipoint wireless bridge Ligo PTP and APC series products to achieve multiple data collection point monitoring information and image data convergence, can be placed multiple PMP or APC wireless bridge to form a multi-sector or 360-degree omnidirectional In the network, a net data capacity of 160 Mbps can be obtained for each sector, and a super capacity of 7,200 Mbps can be obtained for six sectors; the distance can range from several kilometers to several tens of kilometers. For access points with particularly large amounts of data, it is possible to flexibly deploy point-to-point wireless bridge devices Ligo PTP series or backhaul up to a net rate of 220Mbps. In addition, for a particularly congested 5.8 GHz area, PTP can also be used in combination to achieve ultra-high capacity of up to 440 Mbps.

Network mode

Wireless advantage

1) The equipment is compact and lightweight, fast installation, complete outdoor design; user equipment less than 1 kg, and the power consumption is less than 8 watts

2) Stable bandwidth, non-WIFI technology, private protocol; suitable for video transmission

3) Flexible addition and removal of remote cameras according to demand without additional wiring costs

4) High equipment reliability, low repair rate, almost no maintenance cost; suitable for harsh environment in the field

5) Can achieve non-line-of-sight or blocking transmission

6) Effective anti-jamming