Easy to make mistakes in weak current engineering construction

Under normal circumstances, weak current engineering should be a very important work. However, in the construction of weak current engineering will also appear easy to make mistakes. To help you avoid some of the most common mistakes in construction, and to ensure that weak-current projects operate during and after construction.

1, wiring, do not understand the actual distance limit, rush construction.
Before starting the wiring, you should first confirm the distance and range of the connection. Taking typical Ethernet cabling as an example, the distance limit in a Gigabit network is 100 meters. If the company chooses 10 Gigabit technology, it should be based on the corresponding specific design distance.
For example, if a company plans to run a Gigabit network using twisted pair above 100 meters, it must select 6 or higher levels of network cables.

2. The optical fiber is not cleaned before fiber fusion.
Removing the fiber coating and cleaning the fiber is the first step in melting the fiber, but it is also a very important step. If the cleaning is improper, it will bring great trouble to the melting behind.
Such as dust combustion, V-groove fixed position fiber offset, eventually lead to increased fusion loss. Therefore, pay attention to the following points when cleaning the fiber:
A, use alcohol with a purity of more than 99%.
B, replace the gauze or cleaning paper for each cleaning.
C, Clean the edge of the stripped coating.
D, wipe several times, until the sound of Q, Q.

3, crystal head mixed, 6 types of wire with super 5 types of crystal head.
Although it can be used, it is not advisable to mix crystal heads; we used to talk about why.
The super-class 5 network cable and the class 6 network cable have the same material in terms of specifications, but the copper cores of the super-class 5 network cable and the class 6 network cable are different in size. The copper core of the super-class 5 network cable is about 0.45-0.51, while the copper core of the class 6 network cable is about 0.52-0.58. The copper core of the six-type network wire is thicker than the copper core of the five-type network wire. Because the copper cores of the two are different, the holes in the crystal head are also different, so the six-type wire is not easy to connect to the super -5-type crystal head.
On the side of the super 5-type crystal head, the crimping contact has two teeth; the 6-type crystal head core crimping contact has three teeth. General projects may have no problem, but in the process of large broadband transmission, it will affect the system performance, and will not affect the speed of the entire network because of the crystal head.

The cable is in the same area as the "interfering" device.
In the real world, it's not just the wires that interfere with the data lines. For example, transformers, lighting fluorescent lamps, motors, and related equipment that can generate electric or magnetic field interference in the community will have a serious impact on the transmission of data on the network. Therefore, we need to ensure that the line is far away from the area where the interference source is.

5, too concerned about the manufacturer's propaganda data, while ignoring the practical application.
In order to promote the product, some manufacturers idealize the product parameters to achieve good results. For example, a poe switch can transmit 250 meters, which may be under certain circumstances. For example, at a transmission rate of 10m, it can reach 250 m, but it is usually impossible to get the actual project application.
For example, in the switch, some friends also asked a brand of switch backplane bandwidth and packet forwarding rate is quite large, but the actual application is very card, why.

6, the use of multimeter is not very skilled.
Use the resistance gear to measure the voltage, or the current gear to measure the voltage or other misuse, the test data is not prepared, and the quality of the meter is also blamed.

7. Power line selection error.
If the distance between the camera and the host is more than 40 meters, consider using 220V centralized power supply and converting the transformer to 12V on the camera side. Generally speaking, 220V power supply, as long as the system is not too large, less than 8 channels, within 200 meters, you can choose RV2 * 0.75 line, if more than 8 channels, is a high-power infrared camera, consider using RV2 * 1.0 power line, if the distance is farther, in order to ensure safety, it is best to use RV2 * 1.5 line.

8, the new line is not reasonably planned.
Generally, it is believed that increasing the number of lines will help the existing system. It should be noted that due to the final safe completion of the project, the line management will not be automatically terminated. When more and more lines are added, the actual situation will also change. Therefore, we should adhere to cable identification, classify according to color, or take some other types of special treatment to ensure that the relevant lines can be easily identified under any circumstances.

9. After the work is completed, the tools and materials are not recovered, either there are no pliers or the screwdriver is lost.