文章介绍了上海长途交换设备集中监控系统的功能和特点。
The functions and characteristics are introduced in the text about centralized monitor system of Shanghai long-distance switching equipments.
在长途客运车辆和危险品货物运输车辆上安装和使用汽车行驶记录仪，是加强车辆安全行车监控，预防和减少交通事故的重要措施。
Installing and using the vehicle traveling data recorder is an important method to strengthen the monitoring of safe driving so as to prevent and reduce the traffic accidents.
T103测试线用于长途局间中继线上所有监控和信令功能测试。
The T103 is used for the overall testing of supervisory and signaling features on inter - toll trunks.
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