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低频回线平衡巧算Ｋ_１、ｅ_１、ｅ_２值杜卫兵（铁五局电务工程处，铁路电话：０５６０—２４０６７转５２３５）目前，我国长途通信的传输通道逐渐淘汰同轴电缆，而以光纤作为传输媒体。铜芯四线组作为低频回线将小站电话引入长途通信通道，它不管在同轴电缆时代还是在?..
At present, the transmission channel of China’s long-distance communication is phasing out the coaxial cable, while the optical fiber is used as the Transmission media. Copper four-wire group as a low-frequency loop will be the introduction of small cell phone long-distance communication channel, whether it is in the era of coaxial cable or in?