How many types of twisted pairs are there

1) Class I line (CAT1):
The maximum frequency bandwidth of the cable is 750kHZ, which is used for alarm systems or only for voice transmission (Class I standards are mainly used for telephone cables before the early 1980s), and not for data transmission.
2) Class II line (CAT2):
The maximum frequency bandwidth of the cable is 1MHZ, which is used for voice transmission and data transmission with a maximum transmission rate of 4Mbps. It is common in older token networks that use the 4MBPS standard token passing protocol.
3) Three types of lines (CAT3):
Refers to the cable specified in the ANSI and EIA/TIA568 standards. The cable has a transmission frequency of 16MHz and a maximum transmission rate of 10Mbps (10Mbit/s). It is mainly used for voice, 10Mbit/s Ethernet (10BASE-T), and 4Mbit/s token rings. The maximum network segment length is 100m, and RJ type connectors are used, which have faded out of the market.
4) Category 4 line (CAT4):
This type of cable has a transmission frequency of 20MHz and is used for voice transmission and data transmission with a maximum transmission rate of 16Mbps (referred to as 16Mbit/s token ring). It is mainly used for token based LANs and 10BASE-T/100BASE-T. The maximum network segment length is 100m, and RJ connectors are used, which are not widely used.
5) Category 5 line (CAT5):
This type of cable increases the winding density and is coated with 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 data transmission with a maximum transmission rate of 100Mbps. It is mainly used for 100BASE-T and 1000BASE-T networks, with a maximum network segment length of 100m. RJ type connectors are used.
6) CAT5e:
The Super 5 class has low attenuation, low crosstalk, higher attenuation to crosstalk ratio (ACR), signal to noise ratio (SNR), and smaller delay error, greatly improving performance. Category 5 cable is mainly used for Gigabit Ethernet (1000Mbps).
7) Category 6 wire (CAT6):
The transmission frequency of this type of cable is from 1MHz to 250MHz, and the comprehensive attenuation to crosstalk ratio (PS-ACR) of Category 6 cabling systems should have a large margin at 200MHz, providing twice the bandwidth of Category 5. The transmission performance of Category 6 cabling is far higher than that of Category 5 standards, and it is most suitable for applications with transmission rates higher than 1Gbps.
8) Super Category 6 or 6A (CAT6A):
This type of product has a transmission bandwidth between Category 6 and Category 7, a transmission frequency of 500 MHz, a transmission speed of 10 Gbps, and a standard outer diameter of 6 mm. Like the seven categories of products, the country has not yet issued formal testing standards, 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 a single wire is 8mm, and the standard outer diameter of a multi-core wire is 6mm.