Fujitsu Corporation

Toyota Boshoku Kabushiki Kaisha

Takagi Chemicals, Inc.

Tatsuya Nagata

Kazuhiro Ozawa

Kazuyuki Hirata

Yuusuke Nagatani

Noriaki Takagi

Kazuo Matsuyama

Yuki Wakimoto

Daisuke Watanabe

Masakuni Takagi

A method for manufacturing a fuel cell separator includes heating a sheet, pressing the sheet using a first die, thereby forming the sheet so as to have a predetermined thickness, cooling, together with the first die, the sheet that has been formed so as to have the predetermined thickness, and pressing the sheet that has undergone the cooling using a second die, thereby forming a gas passage in the sheet. In the sheet, a content of a thermoplastic resin is greater than or equal to 20 weight percent and less than or equal to 30 weight percent and a content of the carbon material particles is greater than or equal to 70 weight percent and less than or equal to 80 weight percent. The heating the sheet includes heating the sheet to a temperature that is higher than a melting point of the thermoplastic resin.

Method for manufacturing fuel cell separator

A communication route monitoring system monitors a communication route in an ATM network with OAM loopback cells. The communication route monitoring system has a first OAM loopback cell delivering unit disposed in one of the communication devices which performs a network management function, a first returning and relaying unit disposed in each of the communication devices, and a communication route recognizing unit disposed in the communication device which performs the network management function. The first OAM loopback cell delivering unit delivers a first OAM loopback cell for confirming a communication route to a route terminal point. The first returning and relaying means returns the first OAM loopback cell upon reception of the first OAM loopback cell, together with its own location identification added thereto, to a source, and relays the received first OAM loopback cell to a next one of the communication devices. First OAM loopback cells together with added location identifications of the respective communication devices are returned to the communication route recognizing unit. The communication route recognizing unit analyzes the first OAM loopback cell returned from each of the first returning and relaying units to recognize a status of the communication route.

ATM network communication route monitoring system

In an ATM switch, after a communication path is properly set up, a continuity test is performed by passing an OAM cell through the communication path before initiating the transmission of user cells. After the transmission of user cells is initiated, a loopback test is performed by periodically inserting an OAM cell in a user cell flow. When a fault condition is detected as a result of the OAM cell loopback test, a peak cell rate environment is created by adding OAM cells to the user cells for a limited period of time, and communication quality is measured under the thus created environment. When a point-to-multipoint connection with a plurality of leaf points is set up, correspondence between each leaf point and a physical connection point is recorded in a table. When a loopback test to a specific leaf point is requested from a maintenance console, an ATM line control unit corresponding to the specific leaf point is determined by referring to the table, and transmission of the OAM cell is allowed only through that ATM line control unit. In this way, an OAM cell loopback test to a specific leaf point can be accomplished.

Communication monitoring in ATM switch

Growing community of inventors

Nagoya, Japan

Tatsuya Nagata