WIRING APPLIANCE FOR POWER LINE COMMUNICATION, POWER DISTRIBUTOR FOR POWER LINE COMMUNICATION, AND COMMUNICATION NETWORK SYSTEM

PROBLEM TO BE SOLVED: To prevent a communication fault to the outside and communication content leakage in power line communication. SOLUTION: There are provided: branch power lines 3 branched from a power line 2 connected to a power plug 1; a plurality of power source signal lines 5 extending from power receptacles 4 and being capable of multiplex transmission of power source power and power line communication signals; demultiplexing units 6 inserted between each of the power source signal lines 5 and each of the branch power lines 3; a plurality of signal lines 7, branching from the demultiplexing units 6, for propagating a power line communication signal demultiplexed by each of the demultiplexing units 6; and a power line communication control section 8A connected to the signal lines 7. The power line communication control section 8A is capable of presetting a transmission source power receptacle 4 and a transmission destination power receptacle 4, decides whether or not a received power line communication signal comes from the power receptacle of the set transmission source on the basis of information contained therein, and sends the power line communication signal to a signal line 7 corresponding to the power receptacle of the set transmission destination only in a relevant case. COPYRIGHT: (C)2007,JPO&INPIT