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本文设计了中同轴电缆10800路载波系统。在2500Km的模拟参考电路上的总杂音小于10,000pwop,其中分配终端设备的杂音为2500pwop,线路增音设备为7500pwop,这完全符合CCITT的建议。 系统采用了对固定偏差的予均衡和对随机偏差的干线均衡。电缆的温度特性和电缆衰耗随时间变化引起的偏差采用了“予一后”调节的方式来补偿。 增音系统有如下的主要技术性能: 有人段最大长度为126Km,标称无人增音段距离为1.5Km,最大为1.55Km 终端增音段可包含七个有人段长度约840Km。 予均衡长度为有人段的一半,调节段包含6个基本增音段长约9Km。 计算结果表明本系统的设计是合理的,可行的。
This paper designed a coaxial cable 10800 carrier system. The total noise on the 2500Km analog reference circuit is less than 10,000pwop, with 2500pwop for distribution terminal equipment and 7500pwop for line enhancement equipment, in full compliance with CCITT’s recommendations. The system uses a pre-equalization of the fixed deviations and a trunk equalization of the random deviations. The temperature characteristic of the cable and the variation of the attenuation of the cable over time are compensated by the “one to one” adjustment. The system has the following main technical performance: the maximum length of one segment is 126Km, the nominal distance between unambiguous segments is 1.5Km, and the maximum is 1.55Km. The terminal segment can include seven segments of about 840Km. The equalization length is half of the manned section, and the tuning section consists of 6 basic syllables of about 9Km. The calculation results show that the design of the system is reasonable and feasible.