The Difference Between Ordinary Patch Cables And Cross-connect Cables

Ordinary

Ordinary patch cable (straight-through cable): used to connect different devices, such as the connection between the computer network card and the module, the connection between the patch panel and the wiring room, and the connection between the patch panel and the HUB or switch. The RJ45 connectors at both ends of the straight-through cable are wired in the same way, using the T568B standard line sequence.

Crossover cable (crossover cable): used to connect the same device, such as the connection between the HUB and the switch. The RJ45 wiring methods at both ends are different. The T568B standard and the T568A standard are used respectively. One of the wiring is required to switch 1/3 and 2/6 pairs, and the remaining pairs can still be installed in a one-to-one correspondence.

In the integrated wiring intelligent management system, a marking patch cable is also used, which is actually a composite patch cable or a multi-functional patch cable. Usually, in addition to the 4 pairs of wires, a wire is added. This wire It is composed of copper wire or optical fiber, which is used to connect the corresponding detection equipment to real-time detection and management of the wiring system.

patch cables are an important part of the wiring system, and several test standards are as follows:

①TIA/EIA-568-A-4-1999: Propagation delay and delay deviation specification for 100 ohm 4-pair cable

②TIA/EIA-568-A-5-2000: 100 Ohm 4-pair Enhanced Category 5 Wiring Specifications

③TIA/EIA-568-B Part 2: 100Ω balanced twisted pair component standard

Several successively published standards deal with the jumper test methods and requirements of Ca.5 and Cat.5e respectively. The TIA/ELA-568B.2-1 six types of wiring standard have made specific requirements for the patch cable.

For patch cables, an important performance is the performance problem when bending. Since UTP twisted pairs are generally solid cores, they are poor in manageable performance. First, the cable is relatively hard, which is not conducive to bending. Second, the solid core cable will have obvious return loss when it is bent, which will cause the performance of the cable to decline. Therefore, the solid core cable generally has a bending radius of clear requirements.