Patent ID: 8861333

Claim:
A dual-port Ethernet communication device with bypass function, the device comprising: a first Ethernet controller and a second Ethernet controller configured to perform Ethernet communication correspondingly to a first communication port and a second communication port connected to a communication line respectively; a first bypass unit configured to bypass data received by the first Ethernet controller via the first communication port to the second Ethernet controller; a second bypass unit configured to bypass data received by the second Ethernet controller via the second communication port to the first Ethernet controller; a first switching unit configured to select any one of data transferred by a terminal unit to the first Ethernet controller and data bypassed by the second bypass unit and transfer it to the first Ethernet controller, wherein when the data transferred by the terminal unit and the data bypassed by the second bypass unit are inputted at the same time, the first switching unit selects the data bypassed by the second bypass unit preferentially; a second switching unit configured to select any one of data transferred by the terminal unit to the second Ethernet controller and data bypassed by the first bypass unit and transfers it to the second Ethernet controller, wherein when the data transferred by the terminal unit and the data bypassed by the first bypass unit are inputted at the same time, the second switching unit selects the data bypassed by the first bypass unit preferentially, and a power source unit configured to supply emergency power when a power source of the terminal unit is interrupted.