Lightning against of the computer information system is received more and more attention by the people
lightning against approaches of computer network equipment are analyzed
lightning protection measures of power system and signal system are introduced. Effects of surge protection device (SPD) which play a protective effect in computer networks on network and its transmission rate are analyzed
as well as test methods and requirements of network parameters. Strictly and accurately select network parameters and signal SPD to reduce the effects of SPD signal on network transfer rate.