Disclosed is a connection-safe network hub adapted for connection through a 6-wire RJ12 cable as the media for transmission of data and power. Each pin on the RJ12 jack leads to a respective wire embedded in the RJ12 cable, where the first two pins are used for transmitting data, the last two pins for...http://www.google.com.tw/patents/US20040180573?utm_source=gb-gplus-share專利 US20040180573 - Connection-safe network hub
