6A needs to be unshielded or shielded

6A unshielded cables are available in the following forms:

1) Irregular circular Cable

2) Cables with special structures are provided, with coarse diameter.

The above two types of cables will cause difficulties in pulling cables during construction to some extent, and there is no accepted method for testing and acceptance. In addition, it is important to note that an important test parameter is added to the 10g standard: The External crosstalk parameter (ANEXT), that is, when the cable bundled together in the cable trough transmits signals, interference of the surrounding cables on the tested cables. Although the unshielded branch cable system can withstand certain external interference through the internal Balancing Principle of the cable, the twisted pair wires in the same cable trough in the project are generally the same manufacturer products, these cables are exactly the same, when a signal is transmitted, adjacent cables are coupled with each other. In particular, lines of the same color cannot be offset by a balanced structure because the twisting distance and direction are identical. Therefore, if the unshielded cable is accepted, in order to pass the external crosstalk parameter (ANEXT), it must meet the demanding construction requirements: it must not be bundled in the pipe trough, and must be placed randomly), the utilization rate of the cable trough is too low, which is unacceptable in many projects, and the shielding cable does not need to be considered.

However, if the shielded cable and cable network is used to cope with 10 Gigabit transmission, the shielding structure gives it inherent advantages in reducing mutual interference between cables, which not only shields external electromagnetic signals, aluminum Foil also blocks the electromagnetic leakage during transmission of cables, thus affecting the interference of other cables. Ensure that each cable in the tight cable trough runs 10 Gigabit Ethernet at the same time without affecting each other. After testing, the shielding system is generally at least 20 dB higher than the non-shielding system of the same level. Currently, there are 6, 6A, or even 7 cabling systems in Europe. More than 70% of users use shielded cabling systems, while in Germany, up to 97% of users use a shielding system. It can be said that in the high-end cabling market, shielding systems are definitely the mainstream.