Cat5 is a twisted pair cable used in computer networks. It is also a multimedia cable used in information and voice services such as data and voice. It is widely used in Ethernet and broadband access projects. Its quality is directly and inferior. It is related to the transmission quality of information communication. However, due to the development of optical fiber and communication technology, the impact of twisted pair on communication quality is also gradually reduced.The cat5 network cable will be marked with the word “CAT5” and the transmission bandwidth is 100MHz. It is used for voice transmission and data transmission with a maximum transmission rate of 100Mbps.