翻译：测量是通过向双绞线注入差模信号(DM)，然后测量同一对双绞线返回的共模信号(CM)。
The measurement is made by injecting a differential mode signal (DM) into a twisted pair, then measuring the common mode signal (CM) returned on that same twisted pair.
翻译：测量是通过向双绞线注入差模信号(DM)，然后测量同一对双绞线返回的共模信号(CM)。
The measurement is made by injecting a differential mode signal (DM) into a twisted pair, then measuring the common mode signal (CM) returned on that same twisted pair.
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