Power supply current, sufficient to power a remote network device, is transmitted concurrently with a network data signal over a transmission line. A power-sourcing network device that can include a coupling circuit provides power and data to the remote network device. The remote network device (which...http://www.google.fr/patents/US6753761?utm_source=gb-gplus-shareBrevet US6753761 - Power transfer apparatus for concurrently transmitting data and power over data wires
Power transfer apparatus for concurrently transmitting data and power over ...
