The monitoring area of the city is wide, the distance is long, and the monitoring points are densely distributed.
The remote monitoring point is generally installed on the pole of the intersection.
When it cannot be erected to the pole, it can also be erected on the wall of the attached residential building.
The geographical location of the city is harsh and the buildings are relatively tall, which often causes obstruction between the monitoring point and the monitoring center, which is invisible.
Therefore, the relay point is generally selected to be at the highest point to ensure the stability of the wireless link. Such as TV towers, bank buildings, and operator buildings.
At the same time, the bandwidth requirement of the relay link is large. So a point-to-point device can be used to form a backbone link to ensure the stability of the wireless link and the smoothness of the image.
The urban wireless environment is complex and the interference is large. select 5.8G wireless bridge networking much better. Transmission quality and real-time requirements are high.
The image quality can be guaranteed to the greatest extent possible under the premise of ensuring low delay of video transmission, and different monitoring devices and video resolutions should be adopted for different applications. Select the video stream transmission method according to different viewing image modes (single client, multi-client) of the monitoring center. When multiple clients need to view images, they should use multicast to save wireless link bandwidth and prevent congestion.
At this time, the switches of the monitoring centers at all levels must have multicast forwarding control to prevent broadcast storms. The safe city monitoring system can be used jointly by the public security, transportation, government and other departments, so the public security network, transportation network, government network and other multi-network can be combined.
That is to save costs and increase efficiency. For the newly added monitoring area, no wiring is required and the original greening environment is destroyed.
Road area monitoring does not need to be re-excavated, which makes it difficult for passers-by and driving, which affects residents' normal travel
