What are the common UTP cable models?

　　Common UTP (unshielded twisted pair) cable models mainly include the following:

　　CAT3 (Class III line):

　　Application field: It has been widely used in digital and analog voice, 10Base-T Ethernet, 4Mbit/s token ring, etc. Although the use of three types of wires in network cabling has been less, it may still be seen in some old systems or specific applications.

　　CAT4 (four types of lines):

　　Supported applications: Category 4 UTP cables were originally intended to support applications such as Ethernet, 4Mbit/s token ring, and 16Mbit/s token ring, as well as digital voice. However, Category 4 cables are not widely supported, and their price is similar to that of Category 5 cables, so they are mostly replaced by Category 5 cables.

　　CAT5 (Category 5 line):

　　Supported applications: Five types of UTP cables support 100Base-TX, TP-PMD (copper FDDI), ATM (155Mbps) and 1000Base-T (Gigabit Ethernet) applications. It is one of the more common network cabling options.

　　CAT5e (Super Category 5 Line):

　　Performance improvement: Super Category 5 cable has improved performance compared to Category 5 cable, enabling it to better support high-speed network applications such as Gigabit Ethernet.

　　CAT6 (Category 6 line):

　　Bandwidth expansion: The bandwidth of the Category 6 UTP cable system is extended to 250MHz (also said to be 200MHz or higher), which can meet the needs of high-speed networks such as Gigabit Ethernet. The application of Category 6 cables in general wiring is becoming more and more extensive.

　　CAT6a (Enhanced Category 6):

　　Performance enhancements: Compared with Category 6 lines, the enhanced Category 6 line has improved performance and can better support higher bandwidth network applications.

　　CAT7 (Category 7 line):

　　High bandwidth requirements: The planned bandwidth of the Category 7 UTP cable system is 600MHz (also said to reach 1000MHz), which is suitable for network applications with extremely high bandwidth requirements. However, the cost of the Category 7 cable is higher, and its connection module is not compatible with the current RJ-45, so it is limited in popularity.

　　In addition, there are some special types of UTP cables, such as large logarithmic cables (such as UTPcat3/50P), which are mainly used for communication needs in specific scenarios. These cables may vary in structure, but they also follow the basic principles and design of UTP (Unshielded Twisted Pair).

　　In general, the type selection of UTP cable should be determined according to the specific application scenarios and requirements. When selecting, it is necessary to consider the performance indicators such as cable bandwidth, tranSMission rate, attenuation, anti-interference ability, as well as factors such as cost and installation difficulty.