In the weak system of modern intelligent buildings, the security system has a very important position. In traditional design and construction, network cabling and security monitoring cabling are often considered separately. This article will discuss the wide range of use of twisted pair because it has many advantages such as strong anti-interference ability, long transmission distance, easy wiring, and low price.
Twisted pair transmission advantages
The transmission distance is long and the transmission quality is high. Thanks to the advanced processing technology used in the twisted pair transceivers, the attenuation of the amplitude of the video signal and the difference in attenuation between different frequencies of the twisted pair are perfectly compensated, maintaining the brightness and color of the original image and real-time performance. When the transmission distance reaches 1km or more, the image signal is substantially free of distortion. If relay mode is used, the transmission distance will be further away.
Easy wiring and high cable utilization. A pair of ordinary telephone lines can be used to transmit video signals. In addition, one of the five types of unshielded twisted pairs widely installed in a building can transmit one video signal without the need for additional wiring. Even re-wiring makes Category 5 cables easier than coaxial cables. In addition, a Category 5 cable has 4 pairs of twisted pair cables. If a pair of cables is used to transmit video signals, the other pairs of cables can also be used to transmit audio signals, control signals, power supply, or other signals to improve the cable. The utilization rate, at the same time avoids the trouble caused by the separate wiring of various signals, and reduces the project cost.
Strong anti-interference ability. Twisted pair can effectively suppress common-mode interference. Even in strong interference environments, twisted-pair cables can transmit excellent image signals. In addition, several pairs of twisted pairs in a cable are used to transmit different signals and no interference occurs between them.
High reliability and easy to use. Utilize twisted pair to transmit the video signal, need to insert the special transmitter in the front end, want to insert the special receiver in the control center. This type of twisted-pair transmission equipment is cheap and easy to use, requires no specialized knowledge, and does not require much operation. It can be installed once and work stably for a long time.
Cheap, convenient materials. Due to the use of common Category 5 unshielded cables or ordinary telephone lines which are widely used at present, the purchase is easy and the price is also very cheap, which brings great convenience to engineering applications.
There are many ways of security wiring. The best wiring method is the wiring method that is consistent with the project. Therefore, we must integrate several methods according to the project situation.
1, point to point. Each monitoring point pulls a network cable or a 2-pair, 4-core, Super 5 cable. If this point needs to transmit a control signal, the remaining lines of the 2 pairs can be used to transmit control signals.
2, a string. Every four monitoring points pulls a network cable. When cabling, the four-way attachment is first divided into an area. Pass the network cable through these four points in order of distance. At each point, poke the jacket and take out one of the cables for the camera. use.
3, first concentrated, after sending. First, the camera's signal is concentrated together through the coaxial line, into the multi-channel transmitter and then transmitted back to the monitoring center through a cable.
4, tree structure. Use two pairs of 4-core twisted pair cables to pull the signal of the decentralized monitoring point to a relatively concentrated place, and then pull back the monitoring center through 4 pairs or large logarithm over Category 5 twisted pairs.
All the above wiring joints must be connected by welding, and they should be well-wrapped after welding to prevent water ingress and oxidation.
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Warnings:
1.lndoor use only.
2.To avoid being damaged,do not use water or drip irrigation while using.
3.Sunshine lighting time should be 12-18 hours.
4.While irradiating the plants,the height of led grow lamp is not less than 10 inches,low height will cause the destruction of plants.
5.Highly hang the lamp will weaken the energy and affect the growth cycle of the plants, so the lamp should not be hung too high.
6.While taking care of the plants, please spray the leaves and branches 2-3 times everyday,to ensure the the plants do not wrinkle a wither, and have no phenomenon of few fruit, and hard pericarp.
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