Nowadays, video surveillance systems are becoming more and more high-end, and the application of high-definition network video surveillance systems is becoming more and more extensive. Grasping these core technologies and experiences, you can easily handle any kind of video surveillance system.
First, the choice of access switch
More than 8 points (including 8 points more than 720P) Please use 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 100Mbit is 50M-70M. 4M*12=48M, so it is recommended that a 100M access switch should have access to a maximum of 12 720P network cameras. At the same time consider that the current network monitoring using dynamic encoding, the camera code stream peak value may exceed 4M bandwidth, while taking into account the bandwidth of redundant design, so a 100M access switch to control the best within 8 units, more than 8 units recommended Gigabit mouth.
Second, write the address in advance
Before the construction, the IP addresses of all network domes, network cameras, NVRs, computer masters, storage servers, streaming media servers, high-definition decoders, and management servers in the system must be uniformly modified and registered, and care must be taken to avoid The original equipment in the local network (such as computers, network printers) has IP address conflicts. The address of all equipments is to be used as a draft. The address of the camera should also be marked on the drawings so that it can be maintained by the post-sales staff.
Third, the choice of aggregation switches
IPC to the front-end switches can be used between the national standard super five cable, and the front-end switches to the main room of the machine room, please use the national standard six types of cable and six types of crystal head. Our current projects basically use fiber optic transmission, single-mode and multi-mode, and freedom of choice. Optical transceiver or optical module, free choice
The choice of network cable: Between the IPC and the front-end switch, the national super five-category cable can be adopted, and the six types of network cable are gradually applied to the security system.
Fourth, the core switch selection
Be sure to choose the full brand Gigabit switch of the big brand, and must not be fully loaded. For example, if you use a 24-port full Gigabit switch, do not use more than 20 ports in general because the data volume of the network high-definition monitoring is relatively large and the data is continuously transmitted. The processing requirement for the switch is relatively high. If a phenomenon occurs that delays or staggers occur when a switch has many points, you can try to solve it by adding a switch. As for the core switch with no routing function, choose according to need.
V. Monitoring scope
The scope of coverage can be different to determine the type of HD network camera and the number of HD network cameras. There is 1MP (1/4Sensor) / 1.3MP (1/3Sensor) / 2MP (1/2.7Sensor) / 3MP (1/2.5Sensor), in a project, the matching of the lens is very important, it depends on whether or not The customer needs to watch the full coverage of the area.
The relationship between IPC monitoring distance and lens focal length can refer to the following picture:
IPC monitoring distance and lens focal length relationship:
The above data is an approximate range of values
1, the choice of lens, the focal length of the required lens (mm), you can use the visual distance (meters) / 2 to roughly estimate;
2. The distance (meters) from the face can be seen, which is roughly equivalent to the focal length of the lens (mm);
3. According to the relationship between object height and image distance, 1/4 CMOS monitoring distance 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 pan/tilt HD cameras/HD domes can be used for monitoring. However, one thing to note is that PTZ control cameras can only look at a certain part of the surveillance area and there will be blind spots, but the monitoring range is very wide, while the fixed camera always provides panoramic images of the surveillance area, but the monitored area is limited, if needed High-demand, you can use panoramic HD network machine, you can easily achieve panoramic surveillance without blind spots.
Six, monitoring objects
The monitoring object determines the viewfinder range, camera position, and the type of camera required. The monitoring object has sub-micrographs and general observations. The subtle images are effective for identifying people or specific targets, such as: people's faces, certificates, and sales storefront monitoring; the general observation chart is mainly to monitor the flow of the entire scene or scene. The monitoring target determines the viewing range, the camera position, and the desired camera type.
Seven, monitoring environment
Because indoor and outdoor light is not the same, consider the sensitivity and lighting effects. In the outdoor environment, infrared light can be used, and some need to use dual-use day and night surveillance cameras; if it is indoor, then generally do not have to consider so much, then just consider the lighting effect just fine. If you are outside, you must consider the factors related to dust, moisture, water, and vandalism. For example, in a dark environment, a camera with a low illumination function can be used, a wide dynamic camera can be used in a non-uniform light distribution environment, and a professional license plate function camera can be used in a bayonet environment, and an elevator can be used in an elevator environment. Cameras and so on.
VIII. Covert surveillance
Because some places take into account some specific reasons need to install hidden million HD network cameras. Therefore, in this respect, it is necessary to consider the selection of non-hidden or concealed surveillance cameras.
Nine, data encryption security
Some need to consider the HTTPS encryption that encrypts the video stream before it is transmitted over the network, allowing or denying access to IP address-defined IP address filtering, IEEE 802.1X that controls network access, IPv6, and wireless capabilities. Of course, these features are not used in normal situations.
Ten, monitor audio function
This is also a matter of considering where you use it. If you need to use millions of HD IP cameras with audio capabilities, you have to consider connecting headphones or speakers, microphones, and other devices. For example, the electronic examination monitoring system applied on campus.
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