respectively use the power d e f to connect to the power supply each device includes a circuit relating to a kind of power line network bridge powerline bridge by which a power line communication technology plc u2014 power line communication is introduced to performing communication and data transmission the wireless signals generated by the wireless ethernet extension controller 41 and the existed wired network create a network domain the wireless ethernet extension stations 42 43 and the existed wired ethernet network also provide a network coverage especially to link the various terminal devices over the network cables a b c and other like over the power line the mentioned extension devices 41 42 and 43 particularly integrate a feature of power line network bridge the power loop may therefore be regarded as a communication network the wireless ethernet extension controller 41 may establish a communication channel to the wireless ethernet extension stations 42 43 for data transmission according to the embodiment shown in fig4 the power line network is especially used to connect the multiple wireless ethernet extension devices and the each extension device 41 42 43 itself integrates the wireless signaling function and ethernet network capability for extending both wired and the wireless access range since this system provides a scheme to extend wider network coverage the wireless network workstation and ethernet network workstation near the extension devices may conveniently share the same resources over the network fig5 exemplarily describes one embodiment of the inner design of the wireless ethernet extension controller 41 the functional modules within the body 500 of the controller are described as follows a controller end wireless network.