In order to avoid the possibility of the lightning damage, communication cable, commonly used technique is the connection signal arrester (SPD) signal in the cable connected to the network communication equipment, that is, the connection link of a transient overvoltage protection, can protect the electronics from the lightning surge over-voltage and other interference, and prevent invasion of over-voltage and lightning wave, minimize the lightning Impact on system devices. Because the signal arrester is in series in the communication line, the signal arrester should not only meet the characteristics of lightning performance, but also meet the requirements of network performance indicators such as signal transmission bandwidth. Therefore, when selecting related products, consider the surge protection performance indicators, network bandwidth, transmission loss, and interface type.