结构回波损耗是通信电缆的重要指标之一，而电缆绝缘线芯的水电容可综合反映生产线上的周期性缺陷。

SRL (structural return loss) is one of the important indicators of telecom cables, while the capacitance in water of cable may reflect the periodic defect of the production line.

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故障定位或DTF模式指示驻波比或回波损耗水平在各点沿电缆长度和天线系统。

Fault location or DTF mode indicates VSWR or Return Loss levels at each point along the cable and antenna system length.

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