Patent ID: 11967985
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. An optical communication device as a slave station device that communicates with a master station device, the optical communication device comprising:
a physical interface;
a transmission receiving circuitry to receive a frame transmitted by the master station device and transmit the frame;
a controlling circuitry to judge whether the frame is damaged or not when the frame transmitted by the transmission receiving circuitry is received and transmit the frame if the frame is not damaged;
a process executing circuitry to execute a judgment process of judging whether or not the frame transmitted by the controlling circuitry is a specific frame as a frame being specific and execute a process of transmitting the frame to the physical interface if the frame is the specific frame; and
a monitoring judgment circuitry to execute at least one of a process of monitoring whether the frame passes between the controlling circuitry and the process executing circuitry within a predetermined first time or not and judging that the frame was discarded in the controlling circuitry if the frame does not pass between the controlling circuitry and the process executing circuitry within the first time and a process of monitoring whether the frame passes between the process executing circuitry and the physical interface within a predetermined second time or not and judging that the frame was discarded in the process executing circuitry if the frame does not pass between the process executing circuitry and the physical interface within the second time.