May 17, 2023
In practice of monitoring system engineering installation, people need to design monitor circuit according to different actual conditions and customer requirements. Improving suitable monitoring circuit can ensure reliability and rationality of video surveillance system.advantage. The following are common transmission methods for Internet monitoring system settings.
First type: traditional method, consisting of network camera + switching power supply + network cable
When connecting to a network, power plug and network cable must be installed at same time. The power supply can also use AC 220V as a principle to save power cable. Its advantages and disadvantages: not discussed here. Enable each IP camera. There is also a network cable all way to transfer data over network to Internet from hard disk of NVR.
Give a picture (photos collected from Internet)
Second type: POE power system method, with network camera + POE network switch
In this way, power plug is saved compared to previous method. Because each network camera has a network cable as a material for transmitting data signals, plug is no longer used. For network cables, it is sufficient to use unshielded twisted-pair category 5e, and there is no problem with a transmission distance of 100 meters.
Interface method gives picture:
Why is it so popular now to use PoE network switches as a network monitoring system? There are many advantages, namely:
1. Save cables, save wiring time, save wiring labor, and ensure high construction efficiency.
2. There is no need to switch power supply, and it does not use weak current, so there is no risk of electric shock, which reduces likelihood of general failures and reduces maintenance costs.
3. Reduce complexity of construction, simple and convenient, very easy to get started, and project routing is also more beautiful.
Third category: in case of long distance IP camera + fiber optic cable + transceiver, transmission distance can be very long!
As we just said earlier, network cable transmission is normal within 100 meters. If it exceeds 100 meters, people usually consider using a laser cutting machine to transmit optical fiber. The optical fiber not only transmits over long distances (can transmit over 20 km) and effect is stable.
I must admit that when optical fiber transmission data of laser cutting machine is transmitted, data signal is converted into an optical signal for transmission, and then optical signal is converted into a data signal, so that people use fiber optic transceivers to communicate with each other. friend to get job done. As shown in picture:
The price of fiber optic cable is low, transmission distance is long, and it is widely used in monitoring technology. However, optical fiber needs to be spliced, and splicing equipment is more expensive, so generally, splicing must be done by professional personnel, which requires a certain amount of money and time. Fiber optic transceivers are divided into 100M and 1000M, which can be selected according to required number of cameras.
Fourth category: wireless transmission method, surveillance camera + wireless bridge.
In actual operating and maintenance environment of monitoring system, if wiring is difficult to meet natural barriers or inviolable obstacles, we can use wireless data transmission methods, so we use wireless bridges.
For example, wireless data transmission can be used in residential areas with already paved ground, elevator cabins, factories already built, wide areas with long distances and suburbs.
The wireless bridge can convert network signals into electromagnetic waves for point-to-point transmission. A couple of apps. Due to point-to-point fixed data transmission, it can support long distance wireless data transmission from 500 meters to more than ten kilometers.
Notes on building a wireless bridge: There must be no obstacles or interference between transmitting point and receiving side. Then data signal transmission will be stable.
The above methods are common methods for transmitting data to a network monitoring system. When we do a real monitor building project, we must choose best one according to local conditions and requirements of community owner. Transfer mode, so that community owner can spend least amount of money without affecting actual effect of monitoring project.