Notes for using twisted pair wires

The advantages of twisted pair wires for Video Transmission indeed enhance our confidence in using the twisted pair wires for video transmitter in the project. However, there are still some problems in the actual product purchase and wiring applications, summarized as follows:

1) In order to enhance the anti-interference capability, use a shielded wire. Some friends, due to their long-term use of the same axis for transmission, unconsciously applied their experience in using the same axis as the transmission medium to the transmission of twisted pair wires. They believed that the use of shielded twisted pair wires had better performance in anti-interference, however, in fact, some anti-interference capabilities are indeed enhanced by using the shielding line, but the high-frequency signal is seriously damaged, and the transmitted effect is poor. The distance is far away from or even no color image, and the transmission quality is greatly reduced. At the same time, the price of shielded twisted pair wires is high, which increases the engineering cost. Therefore, wiring is the first thing to pay attention.

2) blindly choose low-price products to reduce engineering costs. Any product has a certain reasonable price. The mobile phone looks beautiful and is easy to use and durable, but it is expensive, the reason is that they have done a lot of work in terms of industrial design, quality control, and materials technology. These jobs require investment costs. Naturally, the price is higher than that of some fake mobile phones. At present, most of China's twisted pair wire transmission equipment production enterprises are private small enterprises. Reasonable prices can not only bring benefits to users, but also ensure that production enterprises have a relatively stable motivation, it won't be close in 3 or 5 years, and users may not know who to fix any problems with their products. Twisted pair wire transmission equipment is a problem in recent years. The market price is messy. Some friends first consider the price when purchasing the product, and then consider the quality and after-sales service. This will put the cart upside down. It should be clear that the project we are working on is a security project. Therefore, the entire system of the security project must be of reliable quality products. Otherwise, the quality will not pass through, and the system itself will encounter problems, in addition, how can we monitor the movements of puppies. For all products that require reliability, it is very difficult to achieve the ultra-low price. If you have bought the product, you may have to consider the quality of the product or the advantages and disadvantages of after-sales service. Of course, some enterprises are doing well in cost control, and their cost effectiveness is very competitive. However, such enterprises in China are rare.

3) blindly believe in the product's waterproof, anti-interference and lightning protection capabilities. Most enterprises claim that their products are waterproof, anti-interference, and lightning-proof during publicity. Therefore, in order to convince customers of these capabilities, the cabling should take the initiative to bypass heavy rain, strong interference, and direct lightning strikes. After purchasing the product, the customer will naturally not pay great attention to the places that should be avoided, as a result, interference and lightning damage may occur. Imagine tens of thousands of volts of Thunder can split a big tree into several petals. What is a small pair of wire transmission equipment ?! The chassis will be melted by it. What role can anti-Detonator play. Therefore, in cabling, we must be realistic and avoid them as much as possible. In addition, we can improve the product storage environment so that the devices can work stably in a clean and dry environment.

4) Poor Video performance due to rough cabling. In fact, the unshielded twisted pair wires we purchased on the market are 305 m a box, but the point in the project is left and right, far and near. Therefore, in a short location less than 305 meters, you need to break the network-line foreskin and pick out the lines to pick up the camera. In a long place, you need to connect two or more boxes of lines, it is best to weld and wrap the cables properly, and pay attention to the twisted pair wires and problems, so as to ensure that the transmission is not online.

5) Take two extremes, causing unnecessary waste. It is unscientific to use a long-distance transmission device over a short distance or a short-distance transmission device over a long distance. In order to make the video better, some friends often use the 1200-meter transmission device at no cost to 500-meter. In fact, this is a waste. There are more cost-saving products in short distance, some of which do not require power supply, are more stable and very economical. In today's lack of energy, we advocate effective cost-saving. On the contrary, it would be unscientific to apply a 300-meter-running device to a 500-meter device. Could a 10-year-old child be able to take 100 of the burden, this can only increase the risk of device damage, and the display effect is not good.

6) The wire is too bad, leading to frequent disconnection. When wiring a twisted pair video transmission device, both cables are used. One is to directly remove the two wires in a pair of wires and connect them to the two terminals respectively; one is to use RJ45 crystal head to pick up. Both methods have their own advantages and disadvantages. It is better to use the wiring bar in terms of contact and good contact can be ensured between nodes. However, the wires of twisted pair wires are finer and there is no dedicated tool to deal with them, if the quality of the wire is poor, the opened Wire may be very brittle and hard to handle; Use the crystal head to pick up, people feel very good *, but the actual effect is not good, because the contact of the crystal head * Elastic Compression, A long time may cause poor contact. In addition, we only use one pair of twisted pair wires at a single point. If we put all the four pairs in the crystal head, it is obviously a waste. Therefore, the best way is to still adopt the form of the wiring bar, but when purchasing the wire, the quality is well off, as far as possible to choose the brand wire. Some people are worried about whether the two thin wires can withstand the tension produced by the weight of the long cables in the form of the wiring column. This worry is normal, but we have a way to deal with it, as long as the entire twisted pair wire is fixed near the wiring head, this worry can be completely solved.

7) the research is not deep, the patience is insufficient, and the best effect cannot be adjusted. When I used the twisted pair transmission device for the first time, I saw a thin copy of the paper and thought that the installation was just a piece of cake. So I started to read the manual. However, I found that the actual adjustment was far from the case, the reason is that both the transmitter and receiver must be adjusted during the adjustment, while the transmitter is usually located away, and the people on both sides need to use the walkie talkie for continuous coordination. This kind of work is easy to get upset, therefore, the problem is very likely to occur. Many first-time users can easily scatter gas on twisted pair transmission devices. To solve this problem, the specific construction personnel should first read the manual, and then estimate the distance between the two points based on the actual conditions. First, determine the dial position of the transmitting end, let the construction personnel at the receiving end make appropriate adjustments. If not, it indicates that the estimation is incorrect. Then we need to re-estimate it. After the dial code is set on the transmitting end, the personnel at the receiving end will re-adjust it, in this way, the best effect is easily called out. The key lies in 1. a Regulatory Order should be emphasized; 2. The research attitude should be carried out patiently, comprehensively, and seriously.