Twisted pair classification (2)

Classification according to frequency and signal-to-noise ratio
Twisted-pair wires are commonly classified into three types, five types and super five types, and six types. The former has a small diameter and the latter has a thick diameter. The specific models are as follows:

1) Category 1 line (CAT1): The highest frequency bandwidth of the cable is 750kHZ, which is used for alarm systems, or only suitable for voice transmission (the first type of standard is mainly used for telephone cables before the early 1980s), not for data transmission .

2) Category 2 cable (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 commonly used in the old token network that uses the 4MBPS standard token transfer protocol.

3) Category 3 cable (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 and 10Mbit/s Ethernet (10BASE-T) and 4Mbit/s token ring, the maximum length of the network segment is 100m, and the connector in the form of RJ has faded out of the market.

4) Category 4 cable (CAT4): The transmission frequency of this type of cable is 20MHz, used for voice transmission and data transmission with a maximum transmission rate of 16Mbps (referring to 16Mbit/s token ring), mainly used for token-based local area networks And 10BASE-T/100BASE-T. The maximum length of the network segment is 100m, and the connector in the form of RJ is not widely used.