Fujitsu Corporation

Renesas Electronics Corporation

Hirokazu Shimada

Satoshi Maeda

Yoshimi Toyoda

Hideki Yoshitome

Yasuhiro Yamauchi

Tadanori Yokosawa

Katsuaki Yamanaka

Masamitsu Komi

Chie Eiza

Tamotsu Inoue

Yoshinori Hiraike

An optical network system includes an optical line terminal, an optical splitter that is connected to the optical line terminal via one first optical fiber, and a plurality of optical network units that are connected to the optical splitter via respective second optical fibers. The plurality of optical network units communicate with the optical line terminal using an optical signal of a working wavelength uniquely assigned to each of them. The optical line terminal communicates with an optical network unit that is connected to the optical splitter using an optical signal of a working wavelength and an optical signal of a spare wavelength that is common to a plurality of optical networks.

Optical network system and optical communication method

A data relay device relays data between a base station device and a base station control device. The data relay device includes a data transmission time acquiring unit that acquires a data transmission time from when data is transmitted from the data relay device to when the data is received by the data relay device via the base station device, a frame value detecting unit that detects a predetermined frame value from a frame transmitted from the base station control device and stores the data, and a frame transmitting unit that, when the predetermined frame value is detected, after a predetermined time elapses in addition to the data transmission time acquired by the data transmission time acquiring unit after detection, transmits a frame having the same frame value as the detected one to a transmission source of the frame from which the predetermined frame value is detected.

Data relay device and frame processing method by the same

A relay device that monitors and controls common public radio interface (CPRI) links that are links using CPRIs functioning as interfaces for connecting multiple relay devices included in a radio base station detects a disconnected CPRI link by monitoring, via the CPRI links, relay information containing communication data and control data. The relay device distributes a control content, such as a forced link disconnection that forcibly disconnect a CPRI link or no-transmission that stops the transmission of the communication data, with respect to each CPRI link in accordance with a connecting location of the CPRI link in which a link disconnection is detected. The relay device monitors and controls each CPRI link.

Relay device and relay method

A semiconductor device includes a substrate; an alignment mark formed on the substrate and composed of a metal film; a cover insulating film formed on the alignment mark and covering an entire surface of the alignment mark; and a polyimide film formed on the cover insulating film, and having an opening, which is opened on the alignment mark and has an end face aligning with an end face of the alignment mark, in plan view.

Semiconductor device and method of manufacturing the same

A monitoring system of the present invention achieves highly reliable switching control by having a monitored response time creating/calculating unit calculate a maximum value and a minimum value between which a response time is judged as normal from a response time of the last measurement and from a response time of the last but one measurement, and by having a monitored response time comparing unit set a range in which a response time is judged as normal in a manner that agrees with past response times.

Growing community of inventors

Kanagawa, Japan

Hirokazu Shimada