Abstract: 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 receiving data, and the middle two pins for supplying DC power to all on-line network devices. This pin definition for the RJ12 jack not only provides a framework for orderly transmission of data and power through the network cable, it can also prevent misconnection from network devices having different pin definitions in the interface.