Patent ID: 9001646
Filing Date: 2015-04-07
Classification: H04L

Abstract:
1. An information transmission device comprising: a pair of ring ports of a first ring port and a second ring port, each configured to communicate with an adjacent another information transmission device to form a ring network therewith; an access port configured to communicate with a network outside of the ring network; a communication path setting unit configured to facilitate or cut off communication of the ring ports or the access port, based on a communication setting where a number of users exceeds a maximum number of identifiers within the network determined such that a plurality of communication paths having different priority levels and assigned with the same identifiers have different sections in the ring network; a control signal transmission unit, when a communication failure occurs between the first ring port and another information transmission device, configured to transmit, from the second ring port, a first control signal for instructing a cutoff of communication of the access port in the communication path having a low priority level, and transmit a second control signal for instructing a facilitation of communication of the ring ports; an access port control unit, upon receiving the first control signal, configured to cut off the communication of the access port in the communication path having the low priority level; and a ring port control unit, upon receiving the second control signal, configured to facilitate communication of the ring port having non-communication failure.