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本文建议利用我国现有的小同轴电缆300路和960路载波设备实现对称电缆载波系统的扩容。着重在线性串音方面分析了实现的可能性及所要求的串音防卫度指标。对300路、960路两种扩容系统作了简要比较。300路扩容系统杂音设计结果表明,若采用适当的发送电平预斜方案,增音段长度为6.5公里,能满足每公里3微微瓦的杂音定额。
This paper suggests that the use of China’s existing small coaxial cable 300 and 960 carrier devices to achieve symmetrical cable carrier system expansion. Focus on the linear crosstalk analysis of the possibility of realization and the required crosstalk defense index. On the 300 Road, 960 Road, two kinds of capacity expansion system made a brief comparison. The result of noise design of 300-channel expansion system shows that if proper transmission level pre-tilt scheme is adopted, the length of the phonetic segment is 6.5 km, which can meet the noise quota of 3 micro-watts per kilometer.