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我地区用户是通过JZZ16－Ⅱ型载波中继机实现长途通信的。由于某些因素的影响，在长途话路告警的状态下，相应的长途自动出中继器被重复选试。经分析，其原因是X端子有正电源使CH继电器动作，没有断开对应的长途自动出中继对用户标志器的示困线（参见长途自动出中继器电路），
My area users through the JZZ16-Ⅱ type carrier relay to achieve long-distance communications. Due to some factors, the corresponding long-distance automatic repeater is repeatedly selected when the long-distance alarm is on. The analysis, the reason is that the X terminal has a positive power supply so that the CH relay action, did not disconnect the corresponding long-distance automatic relay out of the user mark on the show busy line (see long-distance automatic repeater circuit)