在我们每天生活、学习和工作的地方，有三种线无所不在，电话线、有线电视电缆和电力线。利用电话线上网，已经是尽人皆知，通过有线电视电缆上网可以说是方兴未艾，然而借助电力线也能够上网吗？也许几年前，仅仅是一种设想。如今则有很多国家和单位在研究这项技术，不少公司 Where we live, learn and work everyday, there are three types of ubiquitous lines, telephone lines, cable television and power lines. The use of telephone lines online, is already well-known, via cable television cable can be said to be in the ascendant, but also with the power line can access it? Maybe a few years ago, just a vision. Now there are many countries and units in the study of this technology, many companies