Four ways of network monitoring installation

Monitoring has always been a large category in the weak electricity industry. Most of the issues discussed in our weak electricity VIP group are also related to monitoring. Many friends have many questions about the installation of monitoring. In many cases, as a construction worker, we have to If the construction is required, then we know more than one method, so that we can meet the different requirements of customers. Today we will talk about several network monitoring systems and several transmission methods.
The first: traditional method, consisting of network camera + power + network cable
This is a commonly used method. Many friends are using it. When integrated wiring, power cables and network cables must be routed at the same time. The power supply can also be 220V AC nearby, which saves power cables. The advantages and disadvantages are not discussed here. Provide power to each network camera. Another network cable transmits network data to the network hard disk video recorder NVR.
As shown below


The second: POE power supply mode, there are network cameras + POE switches
This saves one power cable compared to the previous method. A network camera only needs one network cable as the medium for transmitting signals, and no power cable is needed. Unshielded Super Category 5 twisted pair is sufficient for the network cable, and there is no problem with the transmission distance of 100 meters.
The connection method is as follows:


Why mainstream PoE switches are used for network monitoring systems now has the following advantages:
1. Save wires, save wiring time, save wiring labor, and provide engineering construction efficiency.
2. Without power supply, there is no strong electricity involved, there is no danger of electric shock, reducing the probability of failure and reducing maintenance costs.
3, reduce the difficulty of construction, simple and convenient, easy to get started, and the engineering wiring is more beautiful.
The third type: in the case of long distance, network camera + optical fiber + transceiver
Can transmit longer distances!
Earlier we said that the transmission of the network cable is within 100 meters normally, then in the case of more than 100 meters, we generally consider using optical fiber to transmit. The optical fiber not only has a long transmission distance (can transmit 20 kilometers) but also has a stable effect.
We all know that when data is transmitted by optical fiber, the data signal is converted into an optical signal for transmission, and then the optical signal is converted into a data signal. In this way, we use an optical fiber transceiver to complete the work. As shown in the figure:


Optical fiber is cheap and has a long transmission distance, which is widely used in monitoring projects. However, splicing of optical fibers is necessary, and splicing equipment is expensive, so in general, a special person needs to be used for splicing. This requires a certain cost and time. Fiber optic transceivers are divided into 100M and Gigabit, which can be selected according to the number of cameras.
The fourth type: wireless transmission mode, camera + wireless bridge
In the specific monitoring system implementation environment, if the wiring is difficult to meet a barrier or an insurmountable obstacle, we can use wireless transmission, so that a wireless bridge is used.
For example, wireless transmission methods are applicable to areas that have hardened roads, elevators, established factories, open areas far away, and the wild.


A wireless bridge can convert network signals into radio waves for point-to-point transmission. Use in pairs. Due to point-to-point directional transmission, long-distance wireless transmission can be achieved, from hundreds of meters to tens of kilometers.
Note on construction using wireless bridges: there must be no obstructions and no obstacles between the transmitting and receiving ends. Then the signal transmission will be stable.
The above four methods are commonly used in the monitoring installation process. They mainly need to be selected according to the environment. As a monitoring constructor, each method must be mastered, so that it can be flexibly made according to the requirements of the environment and the owner. Normal choice.

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