A ring topology based architecture for a local area network. The transmission medium is unshielded twisted-pair wire. A set of two such twisted-pairs are used to connect the nodes of the network together, with the transmit twisted-pair wires from one node being connected to the receive twisted-pair wires...http://www.google.com.tw/patents/US6028837?utm_source=gb-gplus-share專利 US6028837 - Ether ring architecture for local area networks
