Device and method for transmitting frame in optical transmission system

A transmission device that is implemented in a second node in an optical transmission system in which a frame is transmitted from a first node to the second node via an optical interface, the transmission device comprising:

• an optical receiver configured to receive a frame from the first node via the optical interface;
• a transmitter configured to transmit the frame received by the optical receiver to a frame termination circuit that terminates the frame via a second electrical interface;
• a decision unit configured to decide, based on first transmission information indicating a data transmission in a first electrical interface provided between a frame generation circuit that generates a frame and an optical transmitter that transmits the frame generated by the frame generation circuit via the optical interface in the first node and second transmission information indicating a data transmission in the second electrical interface, whether a type of a first error correction code used in the first electrical interface is the same as a type of a second error correction code used in the second electrical interface;
• and
• a rate controller configured to control a reception rate for receiving a signal via the optical interface,
• wherein when the type of the first error correction code is different from the type of the second error correction code,
• the rate controller controls the optical receiver so that the optical receiver receives a frame to which an error correction code is not added via the optical interface at a first rate, and
• the transmitter adds an error correction code to a frame received by the optical receiver and transmits the received frame to the frame termination circuit, and
• wherein when the type of the first error correction code is the same as the type of the second error correction code,
• the rate controller controls the optical receiver so that the optical receiver receives a frame to which an error correction code is added via the optical interface at a second rate that is higher than the first rate, and
• the transmitter transmits the frame received by the optical receiver to the frame termination circuit.

A transmission method for transmitting a frame from a first node to a second node via an optical interface, wherein a frame generation circuit that generates a frame and a first transmission device that outputs the frame generated by the frame generation circuit via the optical interface are provided in the first node, a second transmission device that receives a frame via the optical interface and a frame termination circuit that terminates the frame received by the second transmission device are provided in the second node,

• wherein when a type of a first error correction code added to a frame that is generated by the frame generation circuit is different from a type of a second error correction code terminated by the frame termination circuit, the transmission method comprises:
• terminating and removing the first error correction code added to the frame in the first transmission device;
• outputting the frame from which the first error correction code is removed via the optical interface;
• adding the second error correction code to the frame received via the optical interface in the second node;
• and
• guiding the frame to which the second error correction code is added to the frame termination circuit, and
• wherein when a type of an error correction code added to a frame that is generated by the frame generation circuit is the same as a type of an error correction code terminated by the frame termination circuit, the transmission method comprises:
• outputting the frame generated by the frame generation circuit via the optical interface without terminating the error correction code added to the frame in the first node;
• and
• guiding the frame received via the optical interface to the frame termination circuit in the second node.