DIN CLC/TS 61643-22-2007
低压浪涌保护装置.第22部分:接到通信和信号网络的浪涌保护装置.选择和应用原则
Low-voltage surge protective devices - Part 22: Surge protective devices connected to telecommunications and signalling networks - Selection and application principles (IEC 61643-22:2004, modified); German version CLC/TS 61643-22:2006