Network cable is a communication line connecting network devices. The network cable consists of four wires, namely a pair of random number transmission lines and a pair of control signal transmission lines. The four lines of network cable mean that through these four lines, network equipment can transmit data in the Internet, connect it to the network, and allow users to use network resources.

There are many kinds of network cables, and different wire specifications and structures are adopted according to their uses and performance levels. Among them, the more common ones are through network cable and cross network cable. Direct network cables can be connected by plugging in the plugs of network devices at both ends in the same order, while cross network cables need to be connected with 1 pin and 2 pins with 3 pins and 6 pins, and then they can be used normally.

Choosing the right network cable may have an important impact on network performance. Shorter network cable can reduce signal loss and interference, thus improving network speed and stability. Using higher specifications and quality network cables may also bring better transmission quality and speed. To sum up, the four network cables not only refer to their composition, but also pay attention to the selection of network cable types and quality to ensure the stability and efficiency of network performance.