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在有线网络中随机比特差错率可以忽略，拥塞主要由包丢失造成。
In a wired network, random bit error rate may be neglected and the congestion result from packets loss.
基于在不同环境中对比特差错率的研究，色散对单模光纤的影响要强于对位移光纤的影响。
Dispersion influence on SMF is more severely than DSF based on the observation of BER under different environment.
然后对接收功率及比特差错率进行了计算分析，结果表明通信链路参数设计满足比特误码率要求。
Subsequently, the received power and bit error ratio are calculated, the results show that the parameters design of communication link can meet the demand of the bit error ratio.
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