Dual port ethernet communication device with bypass function

摘要

Provided is a dual port Ethernet communication device which allows data received via any one communication port to be bypassed to other communication port. Since the Ethernet communication device performs such bypass operation itself, the communication data can be kept transferred to other terminal unit even though the terminal unit equipped with the Ethernet communication device does not operate normally due to causes such as a break down. In particular, if it is used in each terminal unit forming a closed loop in a closed loop power system, the communication on the closed loop remains such that the adjacent terminal unit can perform backup interrupt function even though a failure happens in a specific terminal unit forming the closed loop.

主权项

1. 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.