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ＮＥＣ及ＳＥＣ传输设备故障的分析天津市市内电话局陈万军近年来在电信网中大量使用了光纤、光端机、数字复用设备等传输设备，极大地提高了网路的传输效率，也为通信企业带来了可观的经济效益。但由于这些设备的数量越来越多，一旦出了故障，又会对电信网产生不同程度的...
Analysis of NEC and SEC transmission equipment failures In recent years, Chen Wanjun, a local telephone bureau in Tianjin Municipality, has made extensive use of transmission equipment such as optical fiber, optical fiber terminal and digital multiplex equipment in telecommunications networks, which has greatly improved the transmission efficiency of the network. Has brought considerable economic benefits. However, due to the increasing number of these devices, once out of trouble, it will have different degrees of ...