Patent ID: 8692407

Claim:
A home network system, comprising: a set of power line transmission apparatuses, one of the set of power line transmission apparatuses being defined as a first power line transmission apparatus, the other one of the set of power line transmission apparatuses being defined as a second power line transmission apparatus, the first power line transmission apparatus connected with the second power line transmission apparatus via an internal power line, and each of the power line transmission apparatuses having a power line network interface and an isolating unit for filtering a high frequency noise signal, the first power line transmission apparatus and the second power line transmission apparatus are identical and interchangeable; wherein an external power line is selectively connected to one of the first power line transmission apparatus and the second power line transmission apparatus, the power line transmission apparatus connected to the external power line receives and converts a digital signal transmitted through the external power line, and consequently, modulates the converted digital signal into a first power signal so as to generate a second power signal and transmit the second power signal to the power line transmission apparatus not connected to the external power line via the internal power line; wherein the power line transmission apparatus not connected to the external power line recovers the digital signal on basis of the converted digital signal so as to output the digital signal, and isolates the modulated digital signal and the high frequency noise signal out of the second power signal to recover and output the first power signal, wherein the power line network interface includes at least one digital signal input/output interface for inputting or outputting the digital signal, converting the digital signal into the converted digital signal and modulating the digital signal into the first power signal so as to generate the second power signal, or recover the digital signal from the second power signal.