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针对专网长途中继电路的人工测试做法，提出专网长途中继电路的自动监测方法．先从理论上阐述了２种通讯技术实现自动监测的方法：即占线测试法和系统测试法；然后给出了实现自动监测的具体方法，包括界面形式、语言函数的编程中应注意的问题．本文提出的方法，在维护飞利浦ＳＯＰＨＯ系列交换机的实践中得到应用，对其它类型的程控数字交换机的长途中继电路的监测也具有示范作用．
Aiming at the artificial test of long-distance trunk circuit in private network, an automatic monitoring method of long-distance trunk circuit in private network is proposed. First of all, two methods of automatic monitoring of communication technology are expounded theoretically: Busy-line test method and system test method. And then, the specific methods of automatic monitoring are given, including the interface form and the problems to be noticed in the programming of language functions. The method proposed in this paper is applied in the practice of maintaining the Philips SOPHO series switches and also plays an exemplary role in the monitoring of long-distance trunk circuits of other types of program-controlled digital switches.