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Terms for subject Telecommunications containing protection circuit | all forms | in specified order only
| English | Chinese |
| Battery feeding, Overvoltage protection, Ringing, Supervision, Code, Hybrid circuit,Test | 用户线基本动能馈电，过压保护，振铃，监视，编译码,2/4线转换， 测试 |
| high tension protection circuit | 高压保护电路 |