信号电缆是一种信号传输工具。一般信号电缆传输的信号很小，为了避免信号受到干扰，信号电缆外面有一层屏蔽层，包裹的导体的屏蔽层，一般为导电布，编织铜网或铜泊（铝），屏蔽层需要接地，外来的干扰信号可被该层导入大地，避免干扰信号进入内层导体干扰同时降低传输信号的损耗。
在系统回路中必须采用屏蔽信号电缆，并可靠接地。
Shielded signal cable must be used in system loop, and must be grounded firmly.
介绍信号电缆分歧型地下接续的工艺原理、操作流程及其应用。
The technique principle, operation process and application of an underground repeater for signal branch cable were introduced in this paper.
介绍了采用TDR方式(时域反射法)开发的信号电缆故障点检测仪。
Introduces the signal cable fault locator detector developed on basis of TDR mode.
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