Detailed Explanation Of 4 Kinds Of Faults When Connecting Network Cable RJ45

RJ45 connection methods are generally divided into two types, T568A and T568B. There is no difference in performance between these two connection methods, but the same connection method must be used for construction in the project. In the wiring process, some small problems will also be found. In this article, we will explain the wiring faults of the RJ45 plug in detail.

1. Line disconnected

Refers to the problem of disconnection of one or more core wires in the termination of an 8-core cable. The general solution is to check the termination of the module and the patch panel, and the crimping of the patch cable modular plug. This problem is the most common in engineering. Errors can be avoided during termination, and the patch cable should be made of original molded patch cable as much as possible to improve the efficiency of implementation in projects with multiple information points.

2. Short circuit

It is a line failure caused by the interconnection of one or more core wires. The troubleshooting method can use the time domain reflection technology of the test instrument to locate the fault point, according to the position of the short-circuit point, and then determine whether the problem occurs in the connection point or the middle of the cable, so as to quickly eliminate the fault.

3. Cross

This problem is generally caused by negligence during wiring, which is easy to occur in some brands of cables. Since the secondary color of the core wires of these cables is often pure white, it is easy to unplug the white core during construction. Line positions are mixed up.

4.Color inversion

It means that the color of the wire pairs on both sides of the line is reversed. This problem often occurs in the construction error of using T568A on one side and T568B on the other side. What is to be explained here is that in the 100Base-TX network, according to the principle of sending and receiving wire pairs, this connection method can be used for direct connection of dual-machine network cards, and it is not allowed in the project.

5. String winding

It is manifested as combining new transmission line pairs from different winding pairs, resulting in the combination of 3 and 6 transmission cores from different winding pairs, because this arrangement destroys the balance principle of twisted pairs, although ordinary on-off is used. The connectivity test of the tester is normal, but the 3 and 6 cores will have a great near-end string winding, which will cause the network to fail to connect. This problem often occurs on the connection link of the directly hand-made modular plug.