A network switching apparatus for supplying power to network communication equipment through a twisted pair line comprising a power control circuit having a plurality of sockets, each socket connected with a RJ-45 connector so as to electrically connect the switching apparatus to a corresponding socket...http://www.google.com/patents/US7162650?utm_source=gb-gplus-sharePatent US7162650 - Network switching apparatus for supplying power to network communication equipment through twisted pair line
