Patent ID: 6747982
Filing Date: 2004-06-08
Classification: H04L

Abstract:
A communication method for use in a communication system constructed by connecting a pair of loop type networks via a gate way, each loop type network being constructed by connecting a plurality of addressable relay units via a data transfer line, one or more addressable node terminals being connected to each addressable relay unit, so as to execute data exchange between the addressable node terminals, the addressable relay units, or the addressable node terminal and the addressable relay unit, the communication method comprising the steps of:describing source/destination addresses, which designates at least one of said addressable relay units and said addressable node terminals, previously in an address describing area provided in communication data as transmission object by the addressable relay units; transmitting the communication data, in which the source/destination addresses are described, to a destination by the addressable relay units; decoding the source/destination addresses included in received communication data by the gate way; deciding whether or not a source and the destination belong to a same network, by the gate way based on the decoded source/destination addresses and attribution identification information stored previously; selecting said same loop type network as the destination of the communication data when a result of the attribution decision indicates said same loop type network; selecting a different loop type network as the destination of the communication and determining whether the different loop type network has a different protocol than said same loop type network when a result of the attribution decision indicates said different loop type network; and then transmitting the communication data to the destination via the selected route by the gate way, wherein said communications data is transmitted to the destination with the source/destination address as the only address information included in the communications data and without any network address information.