GB 3379-1982
AbolishedInteroffice direct signalling system for telephone automatic switching network
电话自动交换网局间直流信号方式
Application Summary AI generated
This standard specifies the direct current (DC) signalling methods used between telephone exchanges in China's automatic switching network. It defines the electrical characteristics, signal formats, and transmission rules for interoffice signalling over trunk lines. The standard applies to the design, installation, and maintenance of DC signalling equipment in public switched telephone networks (PSTN) to ensure compatibility between exchanges.
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