If you want to use twisted pair transmission in the monitoring project, the following precautions hope to help you!
1. In order to enhance anti-jamming capability, use shielded cables.
Some friends have used the coaxial cable as a transmission source for a long period of time. They have unwittingly applied the experience of using the coaxial cable as a transmission medium to the twisted pair transmission. It is believed that the use of shielded twisted pair cable has better performance in anti-jamming, however, In fact, the use of shielded wire does enhance some anti-interference ability, but it seriously damages the high-frequency signal, and the effect of the transmitted color is degraded. The distance is far from even a color image, and the transmission quality is greatly compromised. At the same time, the high cost of shielded twisted pairs is increasing the cost of the project, so wiring is the first priority.
2, in order to reduce the cost of the project, blindly select low-priced products.
Any product has a certain reasonable price, good mobile phone appearance is beautiful, easy to use, durable, but expensive, because of its industrial design, quality control, material processing and so on have done a lot of work, these jobs are Need for input costs, natural prices are higher than some ubiquitous mobile phones. At present, most twisted-pair transmission equipment manufacturers in China are private small-scale enterprises. A reasonable price can not only provide users with benefits, but also ensure that the production companies have a more stable power, and will not close in 3 or 5 years. Users themselves The product at hand has no problem and I do not know who to look for. Twisted pair transmission equipment is a matter of recent years. The market price has been confusing. Some friends first consider the price when purchasing products, and then consider the quality and after-sales service. This puts the cart before the horse. It should be clear that the project we are doing is a security project. Therefore, the whole system of the security project must be of a reliable quality, otherwise the quality will be too low, the system itself will have problems, and we will also monitor how small the cats and puppies are. All you need to buy a reliable product, ultra-low prices is difficult to do, if you buy it, you may want to consider the quality of this product or the advantages and disadvantages of after-sales service. Of course, there are also some companies that have done a good job in cost control. Their price/performance ratio is very competitive. However, in China, such enterprises are rare and very few.
3, blindly believe that the product's waterproof, anti-jamming and lightning protection capabilities.
Most of the companies mentioned that their products are water-proof, anti-interference and lightning-proof. Therefore, in order to convince customers of their ability to communicate with customers, wiring should take the initiative to bypass rain, strong interference and The direct lightning strikes in the area are completely gone. Customers naturally don’t pay much attention to the places that they should have avoided since they purchased the products. As a result, they may cause interference and be directly destroyed by lightning. Just imagine, tens of thousands of volts can make a big tree into a few flaps. What is a small twisted pair transmission device? ! The shell will be melted by it, and the detonator can also play a role. Therefore, in the wiring, we must seek truth from facts, try to bypass them, and farther away the better, while improving the environment where the product is stored, so that the equipment can work stably in a clean, dry environment.
4, rough wiring process, resulting in poor video performance.
In fact, the unshielded twisted pairs we have purchased in the market are all 305 meters in a box, but the points in the project are left, right, and right, far and near. Therefore, a short place less than 305 meters needs to be broken. The foreskin, picking the line out to pick up the camera, the long place will need to connect two boxes or even more boxes of the line, the best welding, banding, and pay attention to the twisted and twisted twisted pair of the twisted pair, so as to ensure Transmission is not an issue on the wire.
5. Take two extremes and cause unnecessary waste.
The use of long-distance transmission equipment for short distances, and use of short-distance transmission equipment is unscientific for longer distances. In order to make video work better, some friends often use 1200 meters of transmission equipment at a cost of 500 meters. In fact, it is unnecessary to do so. It is a waste. There are even more economical products in the short-to-medium distance, some do not need power supply, and they are more stable and economic. In today's energy shortage, we advocate effective conservation. On the other hand, if you use a device that works normally at 300 meters, it is unscientific. If you ask a 10-year-old to pick 100 pounds, it will only increase the risk of equipment damage. not good.
6, poor wire, resulting in frequent breaks.
Twisted-pair video transmission equipment in the wiring when most of the two to take the wiring, one is directly to the two lines of a pair of lines after the holster is connected to the two terminals of the equipment; one is the use of RJ45 Crystal head to pick up. Both methods have their own advantages and disadvantages. The terminal is better in contact and can ensure good contact between the nodes, but the twisted-pair wires are thinner. There is no special tool to deal with them. If the quality of the wire is not Well, the wire that is opened may be very fragile and can't withstand tossing; using a crystal head to pick it up makes people feel very good, but the actual effect is not good, because the contact of the crystal head * elastic compression may cause a long time Poor contact. In addition, generally we only use one pair of twisted pairs in the four pairs of lines, if the four pairs of lines are made in the crystal head, it is obviously a waste. Therefore, the best way is to continue to take the form of a terminal, but in the purchase of wire, the good quality, as far as possible the use of brand wire. Some people worry about whether it is normal for the two thin wires to withstand the tension caused by the weight of the long wires when wiring in the form of a terminal. This kind of worry is normal, but we have a way to deal with it, as long as the entire wire is near the terminal Twisted pair is a fixed, this worry can be completely resolved.
7, the study is not deep, patience is insufficient, failed to adjust the best results.
When using the twisted-pair transmission equipment for the first time, I saw that the thin one-page manual stated that the installation was just a piece of cake. I took a cursory look at the instructions and started to get started. However, I found that the actual adjustment was far from the same thing because of the adjustment. Transmitters and receivers must be adjusted, and transmitters are often located at a distance of 100 kilometers. People on both sides need to coordinate with the walkie-talkie. This kind of work is easy to upset, so the problem is very easy to produce. For the first time users, it is easy to spray gas on twisted pair transmission equipment. The solution to this problem is that the specific construction personnel must first read through the manual, and secondly estimate the distance between the two points based on the actual situation, first determine the dialing position of the transmitter, and then let the construction personnel at the receiving end make appropriate adjustments. If not, If the estimate is incorrect, it must be re-estimated. After the dialing code is set on the transmitting end, the receiving end personnel will perform another adjustment. In this way, the best effect can be easily adjusted. The key lies in 1. We must stress a sequence of adjustments. 2. We must hold the attitude of research and do it patiently, comprehensively, and earnestly. Of course, manufacturers must also constantly design equipment that can be adjusted more simply so that everyone can continue to join in.
1. In order to enhance anti-jamming capability, use shielded cables.
Some friends have used the coaxial cable as a transmission source for a long period of time. They have unwittingly applied the experience of using the coaxial cable as a transmission medium to the twisted pair transmission. It is believed that the use of shielded twisted pair cable has better performance in anti-jamming, however, In fact, the use of shielded wire does enhance some anti-interference ability, but it seriously damages the high-frequency signal, and the effect of the transmitted color is degraded. The distance is far from even a color image, and the transmission quality is greatly compromised. At the same time, the high cost of shielded twisted pairs is increasing the cost of the project, so wiring is the first priority.
2, in order to reduce the cost of the project, blindly select low-priced products.
Any product has a certain reasonable price, good mobile phone appearance is beautiful, easy to use, durable, but expensive, because of its industrial design, quality control, material processing and so on have done a lot of work, these jobs are Need for input costs, natural prices are higher than some ubiquitous mobile phones. At present, most twisted-pair transmission equipment manufacturers in China are private small-scale enterprises. A reasonable price can not only provide users with benefits, but also ensure that the production companies have a more stable power, and will not close in 3 or 5 years. Users themselves The product at hand has no problem and I do not know who to look for. Twisted pair transmission equipment is a matter of recent years. The market price has been confusing. Some friends first consider the price when purchasing products, and then consider the quality and after-sales service. This puts the cart before the horse. It should be clear that the project we are doing is a security project. Therefore, the whole system of the security project must be of a reliable quality, otherwise the quality will be too low, the system itself will have problems, and we will also monitor how small the cats and puppies are. All you need to buy a reliable product, ultra-low prices is difficult to do, if you buy it, you may want to consider the quality of this product or the advantages and disadvantages of after-sales service. Of course, there are also some companies that have done a good job in cost control. Their price/performance ratio is very competitive. However, in China, such enterprises are rare and very few.
3, blindly believe that the product's waterproof, anti-jamming and lightning protection capabilities.
Most of the companies mentioned that their products are water-proof, anti-interference and lightning-proof. Therefore, in order to convince customers of their ability to communicate with customers, wiring should take the initiative to bypass rain, strong interference and The direct lightning strikes in the area are completely gone. Customers naturally don’t pay much attention to the places that they should have avoided since they purchased the products. As a result, they may cause interference and be directly destroyed by lightning. Just imagine, tens of thousands of volts can make a big tree into a few flaps. What is a small twisted pair transmission device? ! The shell will be melted by it, and the detonator can also play a role. Therefore, in the wiring, we must seek truth from facts, try to bypass them, and farther away the better, while improving the environment where the product is stored, so that the equipment can work stably in a clean, dry environment.
4, rough wiring process, resulting in poor video performance.
In fact, the unshielded twisted pairs we have purchased in the market are all 305 meters in a box, but the points in the project are left, right, and right, far and near. Therefore, a short place less than 305 meters needs to be broken. The foreskin, picking the line out to pick up the camera, the long place will need to connect two boxes or even more boxes of the line, the best welding, banding, and pay attention to the twisted and twisted twisted pair of the twisted pair, so as to ensure Transmission is not an issue on the wire.
5. Take two extremes and cause unnecessary waste.
The use of long-distance transmission equipment for short distances, and use of short-distance transmission equipment is unscientific for longer distances. In order to make video work better, some friends often use 1200 meters of transmission equipment at a cost of 500 meters. In fact, it is unnecessary to do so. It is a waste. There are even more economical products in the short-to-medium distance, some do not need power supply, and they are more stable and economic. In today's energy shortage, we advocate effective conservation. On the other hand, if you use a device that works normally at 300 meters, it is unscientific. If you ask a 10-year-old to pick 100 pounds, it will only increase the risk of equipment damage. not good.
6, poor wire, resulting in frequent breaks.
Twisted-pair video transmission equipment in the wiring when most of the two to take the wiring, one is directly to the two lines of a pair of lines after the holster is connected to the two terminals of the equipment; one is the use of RJ45 Crystal head to pick up. Both methods have their own advantages and disadvantages. The terminal is better in contact and can ensure good contact between the nodes, but the twisted-pair wires are thinner. There is no special tool to deal with them. If the quality of the wire is not Well, the wire that is opened may be very fragile and can't withstand tossing; using a crystal head to pick it up makes people feel very good, but the actual effect is not good, because the contact of the crystal head * elastic compression may cause a long time Poor contact. In addition, generally we only use one pair of twisted pairs in the four pairs of lines, if the four pairs of lines are made in the crystal head, it is obviously a waste. Therefore, the best way is to continue to take the form of a terminal, but in the purchase of wire, the good quality, as far as possible the use of brand wire. Some people worry about whether it is normal for the two thin wires to withstand the tension caused by the weight of the long wires when wiring in the form of a terminal. This kind of worry is normal, but we have a way to deal with it, as long as the entire wire is near the terminal Twisted pair is a fixed, this worry can be completely resolved.
7, the study is not deep, patience is insufficient, failed to adjust the best results.
When using the twisted-pair transmission equipment for the first time, I saw that the thin one-page manual stated that the installation was just a piece of cake. I took a cursory look at the instructions and started to get started. However, I found that the actual adjustment was far from the same thing because of the adjustment. Transmitters and receivers must be adjusted, and transmitters are often located at a distance of 100 kilometers. People on both sides need to coordinate with the walkie-talkie. This kind of work is easy to upset, so the problem is very easy to produce. For the first time users, it is easy to spray gas on twisted pair transmission equipment. The solution to this problem is that the specific construction personnel must first read through the manual, and secondly estimate the distance between the two points based on the actual situation, first determine the dialing position of the transmitter, and then let the construction personnel at the receiving end make appropriate adjustments. If not, If the estimate is incorrect, it must be re-estimated. After the dialing code is set on the transmitting end, the receiving end personnel will perform another adjustment. In this way, the best effect can be easily adjusted. The key lies in 1. We must stress a sequence of adjustments. 2. We must hold the attitude of research and do it patiently, comprehensively, and earnestly. Of course, manufacturers must also constantly design equipment that can be adjusted more simply so that everyone can continue to join in.
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