求助！！！ethernet phantom power名词
在为公司翻译产品资料时遇到了 ethernet phantom power 这一名词
英文解释如下：
this is a voltage which is connected to the center taps of the ethernet interface transformers of some network equipment to power remote devices, like ip phones or wireless transceivers. this power is seen by the tester;as voltage between the 1-2 and 3-6 pin pairs. the voltage found is reported as “enet pwr source found = xv” for several seconds, then the test proceeds automatically.
我从中不能深刻理解这个技术。不知道跟中文说的“幻象电压”是否为一回事，一时也没有查到资料，谁能帮帮忙啊!
