A first network device supplies power to a second network device in communication therewith. The first network device comprises a physical layer device which includes a pulse generator to generate a test signal comprising n sub-pulses to be transmitted to the second network device, wherein in n being...http://www.google.ca/patents/US7203851?utm_source=gb-gplus-sharePatent US7203851 - Method and apparatus for detecting and supplying power by a first network device to a second network device
