明线载波是我国目前省内通信的主要手段,对杂音防卫度的要求是载波电路的一项主要技术指标。从机线设备到外界的电磁干扰,影响电路串杂音指标的因素很多,而且往往由于严重的串杂音干扰使通信质量下降,甚至妨碍通信的正常进行。因此,需要在 Clear line carrier is currently the main means of communications in the province, the degree of noise protection requirements of the carrier circuit is a major technical indicators. From the line equipment to the outside world of electromagnetic interference, circuit noise impact indicators of many factors, and often due to serious crosstalk interference to reduce the quality of communications, or even prevent the normal communication. So, need to be there