GB 3971.2-1983
AbolishedInteroffice junction digital line signalling system for telephone automatic switching network
电话自动交换网局间中继数字型线路信号方式
Application Summary AI generated
This standard specifies the digital line signaling system used between exchanges in China's telephone automatic switching network. It defines the signal formats, coding, and transmission procedures for interoffice junction lines, ensuring compatibility and reliable call setup across different switching systems. The standard is applied in the design, testing, and operation of digital trunk circuits within public switched telephone networks (PSTN).
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