How to select network cable in monitoring installation

In recent days, I received several technical requests from customers, all of which were connected when the screen was lost after the monitoring was installed. When they call, the first thing I consider is the quality of the line, but they basically say that they have been using it all the time and there has been no problem. One or two of them were solved after I asked him to change the wires, but one or two of them insisted that there was no problem with their wires and asked them to change the equipment. One of them changed all the cameras and camcorders, but it still doesn't work.

In the end, I had no choice but to go there myself. I brought a camera of the same model as the installed equipment to the scene, but it still didn't work. In order to prove that it was a wire problem, I made a network cable (not the same as the cloth cable) and connected it to the camera. Everything was fine. At this time, the customer believes that it is the quality problem of the line. So let the wiring people come over and rewire, and the problem is solved.

There is another customer who uses Dahua products at the front and back end, but the switch uses our POE switch, and there are more than 20 cameras installed on the sixth floor. After the completion, different cameras will have a black screen, but the display is not disconnected from the server. I went to the scene to check, and I first made sure that there was no problem with the location of the wiring and switches and the connection distance between the switches and the cameras. Then I asked the converged 100-megabit switches to be replaced by gigabit switches, and the main code stream values of the cameras were lowered. But it still doesn't work. Later, the customer used a computer to connect to the convergence switch and used management software to search. Except for the nearest video camera, none of the cameras were found. At this point, through comparative investigation, it can be determined that it is a network cable quality problem. In this regard, I would like to communicate with my partners and more security peers on how to purchase a network cable with good cost performance in a simple way.

Network cable is generally no problem for big brands and wires made according to national standards. Now many of our peers and customers are purchasing cheap wires from the market in order to reduce costs. It doesn't mean that there are no good products at low prices. Many of our conscientious wire manufacturers and sellers are not well-known in the brand, but when they really want to do a good job in the business and market, their products are not bad. Here we need to know how to identify the good and bad network cables.

Many of us often judge only from the thickness of the wire, but we don't know that although the thickness reaches, the different materials have great influence on the quality. At present, the main materials are copper-clad aluminum, copper-clad iron, copper-clad steel, all copper and oxygen-free copper. Simply knowing whether the network cable is good or bad requires us to have several simple tools, which are usually prepared for weak current, namely micrometer, multimeter and meter ruler.

With these three tools, we can basically know the quality of the thread that the manufacturer gave you. Micrometers are used to measure the thread diameter, which is only used as reference data, and can't completely determine the quality of the thread. However, the thickness of the thread is very important for making the crystal head. Many customers buy the thread cheaply, which will easily fall off when making the crystal head, which will also increase the after-sales cost.

Measuring the meter mark, the national standard line is generally 305 meters, which is basically 305 meters. Most non-marking manufacturers bid for 300 meters, but in order to have an advantage in price or make more money when selling, their meter standard is insufficient. Good manufacturers generally bid for 300 meters and will give them 295 meters, but many bad manufacturers are outrageous, ranging from as little as 30 meters to even higher. Therefore, those who are greedy for cheap should be built here. Don't be fooled by cleverness. Using meters to mark different sections of the whole winding can make you less fooled.

The following is to measure the resistance (that is, the ohm value). According to the above-mentioned non-marking line, if the meter mark is only a little shorter than 1 cm, it basically meets the requirements, and then the wire diameter marked by their manufacturer is 0.5MM, which can actually reach 0.48-0.49 mm. In the above, this item meets the basic requirements, and then the most important thing is to measure the resistance of the wire. If this piece can't meet the requirements, you will be exhausted after installing the network high-definition monitoring cable.

To measure the resistance, we take a whole roll of network cable, determine the diameter of the wire as mentioned above, and how many meters the whole roll reaches, and then we can measure the resistance with a multimeter. First, find out the two ends of the whole network cable, and peel off the eight cores at both ends, but then adjust the multimeter to the ohm value of 100. Next, pick out a line corresponding to the same color from both ends and put it on the red measuring needle and the black measuring needle of the multimeter, and the obtained value is the resistance value. The larger the value, the greater the resistance value and the worse the quality. Moreover, all eight cores must be measured. Some unscrupulous merchants know that only 1236 cores are actually used in the 100-megabit transmission, so the four cores will be covered with other materials in 4578. We should know that many of our network high-definition monitoring now use POE transmission, so that the core can not meet the requirements and will also cause problems. In addition, the wires with the same wire diameter in the factory will have different expansion and contraction when pulling wires, so the measured eight cores will not be the same value, and they are all close to the value.

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