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/US20030061522?utm_source=gb-gplus-sharePatent US20030061522 - Network switching apparatus for supplying power to network communication equipment through twisted pair line
