图 9.4.7 计算机网络及各类信号线的雷电过电压保护Figure 9.4.7 the atmospheric over-voltage protection system for computer network and signal cables
9.5.1 计算机网络和各类信号线的保护规则，可同时参照各类局（站）相关章节内容。9.5.1 The protection rules for computer network and signal cables can refer to the contents in relevant sections for various bureaus (stations)
9.5.2 对多雷区通信局（站）内的计算机网络干线（两端设备在同一机房内除外），以及引到建筑物外的线路，其线路两侧的设备输入口处均应安装SPD。9.5.2 For the trunk lines of computer networks (except for when the equipment on both terminals is in the same machine room) in communication bureaus (stations) at heavy lightning locations and lines led to outside of the building, the input ports of equipment on both terminals of the lines must have SPD installed.
9.5.3 一般计算机网络接口可选择不小于3KA的SPD。9.5.3 SPD of no less than 3KA may be chosen for interfaces of common computer network.高速网络接口可采用由半导体器件组成的小通流量的SPD。High-speed network interfaces may use SPDs with small discharge capacity consisted of semiconductor elements.
9.5.4 对各类控制、数据采集接口和传输信号线，应使用相同物理接口的SPD，SPD件的动作电压应和设备的工作电压相适应，一般应为工作电压的1.2~2.5倍，SPD的插损应不影响设备的正常运行。9.5.4 For all control and data collecting interfaces and transmission signal cables, SPDs with the same physical interface should be used. The actuating voltage of the SPD must be suitable to the work voltage of the equipment, normally 1.2~2.5 times of the work voltage. The inserted elements of the SPD must not affect the normal operation of the equipment.
9.5.5 各类端口SPD的接地线，应就近由被保护设备的接地汇流排（端）接地。9.5.5 The earthing wires of SPDs of all ports will be earthed through earth busbar (terminal) of the protected equipment at the nearest point.
9.5.6 位于联合地网外或远离视频监控中心的攒隐机，应分别在控制、电源、视频线两端安装SPD，云台和防雨罩必须就近接地。9.5.6 Equipment outside of common ground grid or far away from the video-frequency monitoring center should has SPDs installed to both terminals of control, power source and video-frequency cable lines. Cradle heads and rain protection covers must be earthed at the nearest point.
9.5.7 小型无线通信基站信号线SPD的插入损耗应小于等于0.5dB，SPD的放电电流应不小于3kA（8/20 μs）。9.5.7 The insertion loss of the SPDs on the signal cables of small wireless communication base stations must be less than or equal to 0.5dB, and the discharge current of the SPDs must not be lower than 3kA (8/20 μs).
9.5.8 移动基站的馈线SPD，最大放电电流应不小于15kA（8/20 μs），插入损耗EE小于等于0.5dB，驻波比不大于1.2，输入功率应能满足发射机最大输出功率的要求。9.5.8 The discharge current of the SPDs for the feeders of mobile base stations must not be lower than 15kA (8/20 μs), the insertion loss must be less than or equal to 0.5dB, the SWR does not exceed 1.2 and the input power will meet the requirements of the maximum output power of transmitter.
9.5.9 移动基站内的2Mbps传输接口，可根据机房的等电位连接情况，选择安装SPD。9.5.9 The 2Mbps transmission interface in mobile base stations may choose to install SPD according to conditions of equipotential connection of the machine room.
9.5.10 移动基站的直流供电系统，可根据机房的等电位连接情况，选择开关电源直流屏或设备端安装SPD。9.5.10 The DC power supply system of mobile base stations may choose to have SPDs installed on the AC source distribution board or equipment terminal according to conditions of equipotential connection of the machine room.
9.5.11 通信局（站）中对计算机网络及信号线进行过电压保护时，SPD可参照表 9.5.11选取，工程中可根据实际电磁环境和机房等电位连接情况进行必要调整，确保系统安全。9.5.11 When the over-voltage protection system for the computer network and signal cable of communication bureaus (stations) is set up, SPDs can be selected with reference to table 9.5.11, and necessary adjustment can be carried out according to the actual electromagnetic environment and conditions of equipotential connection of the machine room during project to ensure the safety of system.
9.5.11 计算机网络及信号线保护SPD的选取9.5.11 Selection of SPDs for computer network and signal cables
1. GAS 表示气体放电管，SAD表示半导体放电管；PTC表示热敏电阻。1. GAS means gaseous discharge tube, SAD means semiconductor discharge tube and PTC means thermistor.
2. 雷暴日小于40天，但局（站）设备的数据、信号端口有雷害故障发生时，也应考虑安装保护器。2. When thunderstorm days are less than 40 but the data and signal ports in the bureau (station) suffered lightning damage, it should be considered to install protectors.

华译网北京翻译公司翻译过大量有关保安单元的使用的文件资料,Beijing Chinese Translation Service Company has translated many technical documents about The use of protection unit
3.“一端安装”时，SFD应安装在网络设备端，用户端不安装。3. When “installed on one end”, the SFD must be installed at the network equipment terminal, it will not installed at the subscriber terminal.
9.6 保安单元的使用9.6 The use of protection unit
9.6.1 地处少雷区、中雷区的交换局，总配线架可采用由气体放电管或半导体放电管（SAD）与正温度系数热敏电阻（PTC）组成的保安单元。9.6.1 For exchange bureau in light lightning zones or moderate lightning zones, protection unit consisted of gaseous discharge tube or semiconductor discharge tube (SAD) and thermistor (PTC) with positive temperature factor can be used on the master distribution frame (MDF).
9.6.2 地处多雷区和强雷区的交换局，总配线架必须采用由半导体放电管（SAD）与高分子PTC组成的保安单元。9.6.2 For exchange bureau in heavy lightning zones or intensive lightning zones, protection unit consisted of semiconductor discharge tube (SAD) and high molecule PTC must be used on the master distribution frame (MDF).
9.6.3 地处少雷区、中雷区的市话交换局，若交换机用户板时有雷击故障发生，选取保安单元时可按多雷区执行。9.6.3 For exchange bureau in light lightning zones or moderate lightning zones, if the user board of the exchange sometimes suffers lightning stroke protection unit can be selected according to heavy lightning zones.