Dipper -- Common wiring faults in IDC room wiring cracking (1)

Bkjia.com exclusive report] Many companies put all their time and effort on hardware, but cable problems often make all these efforts futile. Cabling systems are the lowest cost in the network, but cables are often ignored, although they are one of the most common causes of network faults. In fact, recent research shows that 70% of network faults are related to cabling systems.

Because the cabling system in the data room has many links, the probability of wiring system faults becomes higher. Common Faults include jumper misconnections and plugging faults, connection faults of copper cables. So, how can we solve these faults?

Next, we will discuss this issue from two aspects: Wiring construction and post-O & M.

Troubleshooting during cabling

The Cabling Process is a high-risk phase of wiring system faults. faults caused by irregular construction and construction errors are often difficult to prevent. During IDC cabling, the high fault area is a twisted pair cabling fault.

In the Cabling Process of twisted pair wires, it is easy to see the line sequence problem that the network is "connected" but "disconnected. Many users often use a one-to-one error connection method in cabling. When the connection distance is short, the system will not encounter connection faults. However, when the connection distance is long, the network is busy or high-speed, it is easy ......, The core is to make the 3 and 6 pins the same twisted pair (based on the T568A or T568B standard ). In Ethernet, two pairs of twisted pair wires are usually arranged at the positions of 1, 2, 3, and 6. If not, instead, the cables used by the original matching pairs are used separately to form a crosstalk (SplitPair errors refer to the transmission performance faults caused by SplitPair errors that are not correctly installed during cabling ), it has a great impact on network performance. The 10 m network environment is not obvious. In a m network environment, if the traffic is large or the distance is long, the network cannot be connected. This fault is common and can be easily detected during the project review process. You only need to repeat the RJ45 header in line order to restore the normal operation.

If no test tool is available, connection errors may occur. Common connection errors include cable label errors, open connections, and short circuits. In the construction of open and short circuits, open or short-circuit faults may occur due to problems such as lack of tools, wiring skills, or wall Threading Technology. The same pair of wires are uplinked at both ends. For example, one end is 1-2, and the other end is 2-1. An error occurs when a line is connected to another line at the other end. For example, one line is 1-2, and the other end is connected to 4-5.

Another kind of fault is string winding. The so-called string winding refers to splitting the original two pairs and then forming a new line pair. As the connectivity of the end-to-end is not affected when such a fault occurs, the common multimeter cannot be used to check the cause of the fault. Only a dedicated cable tester can be used to check the cause.

Faults often occur during Optical Cable layout, such as signal attenuation caused by excessive optical cables, excessive bending loss and compression loss caused by bending transition, compression or breakage of optical cables, poor Optical Cable fusion, joint pollution, poor joint polishing, and joint position poor contact. For specific solutions, see "detailed explanation of the causes of fiber link faults.