目前，先进国家普遍采用硅芯塑管作为光缆通信干线及高速公路通信的管道。
Recent years Silicon Core Tube is widely adopted as pipes of optical cable backbones and expressway communications in developed countries.
系统硬件利用楼宇访客系统的布线网络，通信干线采用CAN总线，以提高通信的实时性和可靠性。
The hardware of the system is built on the layout network of the doorphone system, and CAN BUS is used as the trunk line of communication to improve the real time performance and reliability.
干线综合测试仪是对通信系统中的干线传输设备进行检测的仪器。
Trunk Tester is equipment that is used to test trunk transmission equipment of the communications system.
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