Category 6 cable: The transmission frequency of this type of cable is 1MHz to 250MHz, and the Category 6 wiring system should have a large margin for the comprehensive attenuation and crosstalk ratio (PS-ACR) at 200MHz, which provides twice the bandwidth of Category 5e. The transmission performance of Category 6 cabling is much higher than that of Category 5e standards, and is most suitable for applications with transmission rates higher than 1Gbps. An important difference between Category 6 and Category 5e is that it improves the performance in terms of crosstalk and return loss. For the new generation of full-duplex high-speed network applications, excellent return loss performance is extremely important. The basic link model is cancelled in the six categories of standards, and the wiring standard adopts a star topology. The required wiring distance is: the length of the permanent link cannot exceed 90m, and the length of the channel cannot exceed 100m.