Cannot start communications with the desktop computer. No carrier was detected on the communications port. Please verify that the communications line is connected and active.

无法启动与桌面计算机的通讯。通讯端口上未发现载体。请检查通讯线路是否连通并处于活动状态。

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The application of network communications technology in On-line Monitoring and Fault Diagnosis System of Large Unit Rotary Machine is studied in this paper.

本文讨论了网络通信技术在大型旋转机械在线监测及故障诊断系统中的应用。

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For a power line carrier communications system to perform reliably it must be able to avoid, or cope with, the different types of noise encountered on its communications channel.

为输电线载波通信系统可靠执行它一定能避免，或者应付与，在它的通讯电路遇到的噪声的不同的类型。

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In the UK, they were phased out as front-line bombers by the end of 1961, but about 50 were kept on for training, photographic reconnaissance, communications and jamming enemy radar.

BBC: NEWS | UK | Fact file: Canberra PR9