Patent ID: 11962433
Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 10:
11. An in-vehicle communication system used in a vehicle in which a plurality of function units and a diagnosis device are installed,
the system comprising a plurality of switch devices,
each switch device including a plurality of communication ports, wherein
each switch device is configured to relay a frame, which has been transmitted from a function unit and to which information including an ID of a VLAN is added, to another function unit,
when the diagnosis device is connected to another switch device, a first switch device
determines that the frame is a frame to be duplicated based on at least a source address and a destination address included in the frame,
duplicates the frame to be relayed via a designated communication port among the plurality of communication ports,
generates a duplicate frame for diagnosis that is a frame obtained by adding, to a duplicate frame obtained through the duplication, specific information indicating that the duplicate frame for diagnosis should be transmitted to the diagnosis device, and
outputs the generated duplicate frame for diagnosis from a communication port corresponding to the other switch device,
when the specific information is added to the frame received from the other switch device, a second switch device determines that the received frame is the duplicate frame for diagnosis and sets, to ON, a diagnosis flag of the frame that has been determined as the duplicate frame for diagnosis, and
when the diagnosis flag is ON, the second switch device outputs the duplicate frame for diagnosis from a communication port corresponding to the diagnosis device among the plurality of communication ports.