Mitsubishi Electric Corporation

Joji Ido

Shogo Tatsumi

Takashi Miyauchi

Yuji Ogawa

Tetsuo Komura

Toshiko Kadono

Akinori Yoshinaga

A communication apparatus that forms, in a train in which fixed formations are coupled, a backbone network relaying signals between branch networks formed in the fixed formations with another communication apparatus that is made redundant, includes: a VRRP functional unit that, when operating as a master, periodically transmits an alive monitoring frame to another communication apparatus operating as a backup via the branch network, and, when operating as a backup, receives an alive monitoring frame transmitted from another communication apparatus operating as a master via the branch network; a port-malfunction detection unit detecting malfunction of the port to which the branch network is connected; and an alive determination unit that, when operating as a backup, detects whether another communication apparatus operating as a master has malfunctioned based on an alive-monitoring-frame reception result from the VRRP functional unit and a malfunction detection result from the port-malfunction detection unit.

Communication apparatus and vehicle transmission system

A central device includes an information replacing unit. When the information replacing unit detects, on the basis of contact information acquired from an electric coupler provided in a coupled vehicle in a formation B having a train-information management device that manages vehicle information in accordance with the Ethernet&#xae; protocol, that a formation A that includes a train-information management device that manages vehicle information in accordance with the ARCNET protocol is coupled to the formation B, then the information replacing unit replaces vehicle information from the formation A with vehicle information in accordance with the Ethernet&#xae; protocol; outputs the replaced vehicle information to the formation B; replaces the vehicle information from the formation B with the vehicle information in accordance with the ARCNET protocol; and outputs the replaced vehicle information to the formation A.

Train-information management device and train-information management method

Relay devicesand vehicle monitoring control devicesinclude communication cycle management sectionsandfor managing communication cycles in accordance with cycle information that divides the communication cycle to communication enabled periods which include a period of enabling only communication of a message to be communicated periodically and correspond to a communication period of a message; and carry out communication in the communication cycles managed by the communication cycle management sectionsand

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Tokyo, Japan

Joji Ido