With the rapid development of security monitoring, monitoring and updating are becoming more frequent. More high-definition and more secure video surveillance also brings many opportunities for installation practitioners. So what do we need to pay attention to during the construction process? This article will give you some precautions for installing a network surveillance camera!
Switch selection
Use more than 8 points (including 8 points and 720P or more). 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 one 100M access switch can access up to 12 720P network cameras. At the same time, considering the current network monitoring adopts dynamic coding mode, the peak value of the camera code stream may exceed 4M bandwidth, and the bandwidth redundancy design is considered. Therefore, it is better to control one 100M access switch within 8 units, and more than 8 recommended thousands. Mega.
Make a backup
The IP addresses of all network domes, network cameras, NVRs, computer masters, storage servers, streaming media servers, HD decoders, and management servers in this system must be uniformly modified and registered before construction. The original devices in the network (such as computers, network printers) have IP address conflicts.
Do a good job of registration
All devices in the network system (including the original devices) should not be set to automatically obtain the IP address mode. All the IP addresses are manually set and the registration form is registered.
Note IP
If there is a wireless router in the network system, please pay attention to whether there is a conflict between the IP addresses of the mobile phones and tablets in the wireless network system.
Pay attention to the choice of aggregation switch
IPC to the front-end switch can use the national standard super five network cable, and the front-end switch to the main switch between the computer room, please use the national standard six network cable and six crystal head.
Pay attention to the choice of network cable
IPC to the front-end switch can use the national standard super five network cable, and the front-end switch to the main switch between the computer room, please use the national standard six network cable and six crystal head.
Pay attention to the distance between the camera and the main control room.
The high-definition network dome camera and the HDC to the main switch of the equipment room can only be relayed once by the network switch; if the distance is greater than 100 meters, the optical fiber can be used. For receiving and transmitting, please use one light or one light or one light two electric or one light four electric fiber. transceiver.
Pay attention to the selection of wire
If the network dome camera or network camera to the front-end switch adopts the international super five shielded network cable, the line length is recommended not to exceed 80 meters. If the international six-category cable is used, it is recommended not to exceed 100 meters.
Try not to choose a managed switch
In the case of the main switch of the equipment room, please do not choose a switch with a management type, unless there is an engineer who is familiar with setting up a management switch, or the system is relatively large.
Main switch of the equipment room
To choose a full-gigabit switch of the big brand, and do not load full work, such as 24-port full Gigabit switch, generally do not use more than 20 ports, because the network HD monitoring data volume is relatively large and is constantly transmitting data, the switch The processing requirements are relatively high. If there is a delay or a stuck phenomenon when a switch has many points, you can try to add a switch to solve it.
Network monitoring project scope
The range of HD network cameras and the number of HD network cameras can be determined for different coverage areas. In a project, the choice of lens is very important, it depends on whether it can cover the range that customers need to watch. For the relationship between IPC monitoring distance and lens focal length, please refer to the following pictures:
The relationship between the distance monitored by IPC and the focal length of the lens
The above data is an approximate range of values
1. The choice of lens, the focal length (mm) of the required lens, can be roughly estimated by the visible distance (m) / 2;
2, can see the distance of the face (m), roughly equivalent to the focal length of the lens (mm);
3. According to the ratio of object height and image distance, the monitoring distance of 1/4 CMOS is equivalent to 1.33 times of 1/3 CMOS monitoring distance.
One area can be monitored by multiple fixed cameras, or a small number of PTZ HD cameras/HD balls can be used for monitoring. However, it should be noted that the PTZ control camera can only view a certain part of the monitoring area, there will be a blind area, but the monitoring range is very wide, and the fixed camera always provides a panoramic image of the monitoring area, but the monitoring area is limited, if necessary, more Highly demanding, you can use the panoramic HD network machine, which can easily realize the panoramic view without blind zone.
Network monitoring engineering object
The monitoring object determines the framing range, the camera position, and the type of camera required. The monitoring object has subtle maps and general observation maps. Subtle images work well for identifying people or specific targets, such as: people's faces, documents, and storefront monitoring; the general observations are mainly to monitor the entire scene or the approximate flow of the scene. The monitoring target determines the framing range, camera position and the type of camera required.
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