In the practice of monitoring, we will adopt different solutions according to the environment of Party A. With the correct construction plan, one will improve the stability of the monitoring system, the second will improve the construction efficiency, and the third will reduce the cost. Today, I will tell you about several options or methods for digital surveillance in terms of data transmission.
First: the classic way, one camera, one power supply, one network cable
Wiring needs to be wired two kinds of lines: power line, network line. The power cable transmits 220V AC, and each camera needs a power supply to supply power. The network cable is used to transmit data to the recorder. Both are indispensable.
Second: use POE switches, each camera only needs one network cable, no power cable
In this way, only the 8-core network cable is used as the transmission medium, and the power cable is no longer needed, and the transmission distance can reach 160 meters. Some manufacturers are said to use the non-standard mode to reach 250 meters.
What are the advantages of using POE switches for monitoring projects?
1, no need to cloth power cord, save materials, save labor, improve construction efficiency!
2, pure weak electricity construction, no risk of electric shock, no fire hazard!
3, no longer use the power supply, reduce the probability of failure, reduce maintenance costs!
4, with the storage bracket, the project is more beautiful, acceptance is easier to pass!
5, reduce the construction difficulty, easy and easy to get started!
What are the other benefits, friends who have used POE switches can experience it!
Third: fiber + transceiver, let the transmission distance farther!
When the distance monitored exceeds more than 100 meters, under normal circumstances, the network cable can do nothing. At this time, fiber optics is generally considered. The distance of the fiber can reach 20 kilometers!
Optical fiber uses light to transmit data and needs to work with fiber optic transceivers to get the job done. Fiber optic transceivers are used in pairs to convert optical and electrical signals. As shown below:
Fiber optic transceivers are available in hundreds of megabits and gigabits, depending on the number of cameras installed.
Fiber optics are cheap and have long transmission distances and are used extensively in surveillance projects. However, the optical fiber needs to be welded, and the welding equipment is expensive. Therefore, it is necessary to find a special person for the welding, which requires a certain cost and requires a certain time. This point makes many engineering companies discouraged!
Of course, if it is a leather fiber, it can also be cold-connected. Cold junction tools are relatively inexpensive. Even so, cold-connecting tools are not available to every engineering company, especially those who rarely use fiber optics.
Fourth: wireless bridge, wireless transmission monitoring video
In some construction environments, there are already difficulties in using wired methods. For example, communities that have hardened roads, elevators, factories that have already been built, open areas far away, wild and so on. In these environments, there are relatively large difficulties in using wired methods. At this time, wireless bridges come in handy.
A wireless bridge converts network signals into radio waves for point-to-point transmission. Used in pairs. Due to point-to-point directional transmission, long-distance wireless transmission can be achieved, from a few hundred meters to tens of kilometers. With a wireless bridge, there is only one requirement, that is, there can be no occlusion between the transmitting and receiving ends. Accessibility is required so that signal transmission is stable.
Wireless bridges can be divided into 2.4G and 5.8G according to the operating frequency:
2.4G is cheap and uses more. The 2.4G wireless bridge is generally 150M, and the bandwidth is relatively small. It is suitable for monitoring the number of small channels. Since the civilian WIFI signal is also 2.4G, in some environments, it may interfere with the wireless bridge signal, and there is no problem in close-range use.
The frequency band of 5.8G is relatively clean, and the transmission rate is generally above 300M, which is suitable for wireless transmission of long distance and large road number monitoring.
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