The difference between ordinary jumpers and crossovers is compared. Ordinary jumper (through wire): used to connect different devices, such as the connection between the computer network card and the module, the connection between the distribution frame and the wiring, and the connection between the distribution frame and the HUB or switch. The RJ45 connector connections at both ends of the straight-through cable are the same, using the T568B standard wire sequence.
Cross-connection (cross-over): Used to connect the same device, such as the HUB and the switch. The RJ45 connection modes at both ends are different. They use the T568B standard and the T568A standard, respectively, and require one of the lines to reverse 1/3 and 2/6 pairs. The remaining line pairs can still be installed in a one-to-one correspondence.
In the integrated wiring (online) intelligent management system, an identification jumper is also used. It is actually a composite jumper or a multi-functional jumper. Usually, in addition to four pairs of wires, a wire is added. This wire is made of copper wire or fiber and is used to connect the corresponding testing equipment to detect and manage the wiring system in real time.
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