Patent ID: 8873373

Claim:
An Ethernet transmission apparatus comprising a first and second maintenance group end point (MEP) provided for each of the transmission lines of the operational/non-operational systems and for performing the transmission/reception of a frame to be transmitted over each transmission line in a duplexed manner, and a switching processing part for switching the MEP to be used for reception by using Ethernet-continuity check (ETH-CC) which is transmitted at regular intervals, the Ethernet transmission apparatus being characterized in that the above described first and second MEPs are configured to be able to confirm each other's received content and are adapted to add a continuous sequence number to said ETH-CC when transmitting said ETH-CC, and that when the sequence number of the received ETH-CC is smaller than the sequence number of the ETH-CC received by the MEP of the operational system side, the MEP of the non-operational system side is adapted not to transmit said frame, wherein the switching processing part switches the MEP without using any buffers.