Classification of twisted pair(3)

5) Category 5 cable (CAT5):

This type of cable has increased winding density and a high-quality insulating material. The maximum frequency bandwidth of the cable is 100MHz, and the maximum transmission rate is 100Mbps. It is used for voice transmission and the maximum transmission rate is 100Mbps data transmission, mainly used in 100BASE-T and 1000BASE-T networks, with a maximum network segment length of 100m, using RJ connectors. This is the most commonly used Ethernet cables. In twisted-pair cables, different pairs have different lay lengths. Generally, the lay period of 4 pairs of twisted pairs is within 38.1mm in length, twisted in a counterclockwise direction, and the twisted length of a pair of wires is within 12.7mm.

6) Cat5e (CAT5e):

Cat5e has low attenuation, less crosstalk, higher attenuation to crosstalk ratio (ACR) and signal-to-noise ratio (SNR), smaller delay error, and performance Great improvement. Super Category 5 cable is mainly used for Gigabit Ethernet (1000Mbps).

7) Category 6 cable (CAT6):

The transmission frequency of this type of cable is 1MHz～250MHz. The comprehensive attenuation crosstalk ratio (PS-ACR) of Category 6 wiring system should have a larger margin at 200MHz, which provides 2 times the super Five types of bandwidth. The transmission performance of Category 6 cabling is much higher than that of the Super Category 5 standard, and is most suitable for applications with a transmission rate higher than 1Gbps. An important difference between Category 6 and Category 5 is that it improves the performance of crosstalk and return loss. For a 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 types of standards. The wiring standard adopts a star topology. The required wiring distance is: the length of the permanent link cannot exceed 90m, and the channel length cannot exceed 100m.

8) Super Category 6 or 6A (CAT6A):

The transmission bandwidth of this type of product is between Category 6 and Category 7, the transmission frequency is 500MHz, the transmission speed is 10Gbps, and the standard outer diameter is 6mm. Like the seven types of products, the country has not issued a formal testing standard, but there are such products in the industry, and each manufacturer announces a test value.

9) Category 7 line (CAT7):

The transmission frequency is 600MHz, the transmission speed is 10Gbps, the standard outer diameter of single wire is 8mm, and the standard outer diameter of multi-core wire is 6mm.

The larger the type number, the newer the version, the more advanced the technology, the wider the bandwidth, and of course the more expensive. These different types of twisted pair marking methods are stipulated in this way. If they are standard types, they are marked in CATx mode. For example, the commonly used Category 5 and Category 6 wires are marked as CAT 5 and CAT 6 on the outer skin of the line. If it is an improved version, it will be marked as xe. For example, the super five-category line will be marked as 5e (the letters are lowercase, not uppercase).

Regardless of the line, the attenuation increases as the frequency increases. When designing the wiring, consider that the attenuated signal should also have a large enough amplitude so that it can be correctly detected at the receiving end under the condition of noise interference. How high a rate (Mb/s) the twisted pair can transmit data is also closely related to the encoding method of the digital signal