Electrical supply current, sufficient to power a wireless access point, is transmitted concurrently with a network data signal across a transmission line. A power and data coupler couples the network data signal and the power signal, received through a data input and a power input respectively, and transmits...http://www.google.com.tw/patents/US20020021209?utm_source=gb-gplus-share專利 US20020021209 - Power transfer apparatus for concurrently transmitting data and power over data wires
