降低pcm远动通道误码率的一种方法（A method to reduce the bit error rate of PCM telecontrol channel）.docVIP

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降低pcm远动通道误码率的一种方法（A method to reduce the bit error rate of PCM telecontrol channel）.doc

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降低pcm远动通道误码率的一种方法（A method to reduce the bit error rate of PCM telecontrol channel） A method to reduce the bit error rate of PCM telecontrol channel Zhoujunli (Lishui Nanjing power supply company, Jiangsu, Nanjing, Lishui 211200) Abstract: the error caused by remote signal transmission of PCM four line simulation of the high rate of the situation analysis, find out the repeat D/A, A/D transform is the root cause of the high error rate, and take the method to modify the interface of the remote terminal unit, a one-time implementation of digital remote control signal transmission. This method not only reduces the error rate, but also reduces redundant transformation, and has received very good results. Key words: analog telecontrol signal, digital telecontrol signal, channel, transmission signal, bit error rate. 0 Introduction: Lishui electric power information network is completed, telecontrol transmission channel for power dispatch automation, the power line carrier channel or the original audio cable channel into the fiber channel, arguably, the channel condition will be significantly improved, but we have found the channel error rate generally increased significantly, after careful analysis we found. The original PCM interface enabled increases the transmission error rate. 1 problems arise After a period of rural Lishui, the construction of two power information network of optical fiber communication mode built by the end of April 2003. As a result, the remote signal is withdrawn from the power line carrier or the audio cable and connected to the optical fiber channel and transmitted by PCM. We know that fiber communication has many advantages, one of which is the low transmission error rate. However, we are surprised to find that the error code rate has been greatly increased from the front-end of the telecontrol master station. Table 1 lists the bit error rates before and after the transmission of some substations into the PCM channel. What is the reason for thi