POE power supply
There are four main ways to supply POE power:
1, the switch and the terminal support POE
In this way, the PoE switch is directly connected to the wireless AP and the network camera supporting the PoE power supply through the network cable. This method is the simplest, but also needs to pay attention to the following two points:
1. Determine whether the PoE switch and the wireless AP or network camera are standard PoE devices.
2, to carefully confirm the specifications of the purchased network cable, the quality of the network cable is critical, poor quality network cable will cause AP or IPC can not receive power or restart.
2. The switch supports POE, and the terminal does not support POE.
The PoE switch is connected to the PoE splitter. The PoE splitter separates the power supply into data signals and power. There are two output lines, one is the power output line, and the other is the network data signal output line, that is, the ordinary network cable. The power output has 5V/9/12V, etc. It can match various DC input non-PoE powered terminals and supports IEEE 802.3af/802.3at standard. The data signal output line, that is, the ordinary network cable, can be directly connected to the network port of the non-PoE power receiving terminal.
3. The switch does not support POE, and the terminal supports POE.
The solution switch comes out to the PoE power supply, and the PoE power supply transmits power to the network line and transmits it to the terminal. This kind of scheme is conducive to expanding the original wiring network and has no impact on the original network.
4, switches and terminals do not support POE
The switch of this solution comes out to the PoE power supply, then to the PoE splitter, and finally to the terminal. Solution 3 and Solution 4 are suitable for the transformation of the traditional network, that is, the original switch does not support PoE power supply, but wants to take advantage of PoE power supply.
Poe power supply connection method
In the actual application, how should the network cable be connected? Many friends have some understanding of the POE power supply technology, and know the power supply sequence problems such as 1 2 3 6 or 4 5 7 8 , so they are afraid of the wrong connection, resulting in serious consequences such as equipment burning. .
POE power supply standard requirements for PSE equipment such as POE switches and POE power supply modules (POE power supplies) are as long as one of the 1 2 3 6 and 4 5 7 8 power supply lines is supported. Of course, the latest 802.3at 4pair standard is required. Both are supported at the same time. The requirement for POE powered devices is that both power supplies must be supported at the same time.
How to choose independent power supply and centralized power supply
How to choose independent power supply and centralized power supply
The advantages and disadvantages of the independent power supply and centralized power supply mode are as above. The specific choice depends on the actual installation environment and customer requirements. In general, monitoring systems with less than 4 channels are suitable for independent power supply. For 4- to 16-channel monitoring systems, if the distance is equivalent, it is recommended to select a centralized power supply mode. The monitoring of more than 16 channels can be combined with multi-channel centralized power supply, provided that the pre-configuration is necessary.
for example:
If a business building has 100 fixed-gun network cameras, each camera is rated at 4W. How do we configure the camera power supply? According to the above calculation method, we calculated that the rated power of the camera is 4W*100 units=400W, and the actual power used by the camera is 400W*1.3=520W. After considering the loss, the power required by the camera is 520W*1.3=676W plus the power supply margin. The final power required for the camera is 676W*1.3=878W.
Summarized as follows:
The power supply that the camera needs to be configured = the rated power of the camera *1.3*1.3*1.3 (Note: If the monitoring distance is extremely long, it is necessary to increase the power supply appropriately and increase the power supply voltage).
What is the most taboo for the configuration of the network camera power supply?
The most taboo is that the entire monitoring system shares a power supply.
The reasons are as follows:
1) When the system is being repaired, it is often necessary to turn the power on and off. All the cameras are started at the same time when the power is turned on, the starting current is particularly large, and the impact on the power supply is great, and the power supply will be burned seriously.
2) All cameras share a single power supply. When the power supply fails, the entire closed-circuit monitoring system is paralyzed.
In particular, some important entrance and exit images cannot be monitored, which may cause unnecessary trouble.
So what should be the right approach? As in the above example, a commercial building has 100 fixed cameras, which require a total of about 800W of power. The correct configuration should be 4, each 200W power supply. In this way, when a power supply fails, the camera of the important entrance and exit can be connected to other good power supplies without affecting the operation of the entire system.
What are the issues to be aware of when choosing a network camera power supply?
First: When connecting the camera to the power supply, do not connect the camera with a far distance to the camera with a close distance to the same power supply. If connected to the same power supply, the power supply voltage is high, the camera will be burnt at a close distance, the power supply is low, and the camera with a long distance has no image. Cameras that are farther away should be connected to the same power source as much as possible, and the cameras that are closer should be connected to the same power source.
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