很多公共事业设备对更换电缆布线直接没兴趣：因为这将要求所有工程师重新接受训练。

Many utilities are simply not interested in changing their cabling: it would require all their engineers to retrain.

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最简单的准则是：“无单点故障，例如电源、网络设备或布线都可能导致两条心跳通讯的断开”。

The simplest guideline is "No single failure, such as power, network equipment or cabling can disable both heartbeat connections."

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独自拉线法：独自简便暂时拉一条线到设备，这么能够用来扫除是不是是布线引起了通讯毛病。

Method: simple pull alone alone temporarily pull a line to the equipment, so can be used for cleaning is not caused by the wrong wiring communication.

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