Systems, methods and apparatus are described for testing a data connection provided over a power supply line. A testing apparatus is coupled to a socket of the power supply line. The AC power supply line communicatively couples the testing apparatus to a communication device or another testing apparatus....http://www.google.de/patents/US20090219824?utm_source=gb-gplus-sharePatent US20090219824 - SYSTEMS, METHODS AND APPARATUS FOR TESTING A DATA CONNECTION PROVIDED OVER A POWER SUPPLY LINE
