Patent ID: 9614718
Date: 2017-04-04
CPC Classifications: H04L

Claim:
1. A communication device connected to an end of a first network of a cascade topology, and also to a second network with a frame format different from the first network, the communication device comprising: a transmitter that transmits a first list to an opposing communication device, wherein the first list includes information of a first set of one or more communication devices in the first network, wherein the first set of one or more communication devices is one or more destinations of transmission of frames from the communication device through the first network, and wherein the opposing communication device is connected to the second network, and located at another end of the first network; a receiver that receives a second list from the opposing communication device, wherein the second list includes information of a second set of one or more communication devices in the first network, and wherein the second set of one or more communication devices is one or more destinations of transmission of frames from the opposing communication device through the first network; a storage that stores the first list and the second list; a controller that determines in which of the first list and the second list a destination of a frame is included; and a frame transmitter that transmits, in a case where a destination of a frame received from the first network is included in the second list, the frame to the second network, wherein the frame transmitter converts a frame received from the first network from a format used in the first network to a format used in the second network, and in the conversion, embeds information of a destination node of the frame in a position different from a field for storing destination information, wherein the position and the field for storing the destination information are in a header of the formal used in the second network.