Fujitsu Corporation

Yoshihisa Funami

Kazumaro Takaiwa

Takashi Nakajima

Kazuaki Kobayashi

Masahiro Agata

Yuichi Kotaki

Tetsuo Wada

Yasushi Tateno

Toshihisa Kyouno

Yoshiaki Shibayama

Akinori Nishiie

A transmission apparatus includes: a plurality of signal transmission circuits on a transmission path; a monitoring unit that detects a fault by monitoring an operating status of each of the signal transmission circuits; a controlling unit that outputs a reset instruction when the monitoring unit detects the fault; and an individual resetting unit that receives the reset instruction and resets individually each of the signal transmission circuits.

Transmission device serially resetting each circuit included therein

A distributed power supply circuit supplying common power to multiple packages in an apparatus so that a primary voltage of the common power is converted into a secondary voltage in a voltage conversion part so as to be supplied to a circuit in each of the packages is disclosed. The distributed power supply circuit includes a power supply monitoring part configured to monitor the primary voltage; a reset part configured to stop the supply of the primary voltage to the voltage conversion part when the power supply monitoring part detects the abnormality of the primary voltage; and a discharge part configured to release a stored charge on the primary side of the voltage conversion part when the power supply monitoring part detects the abnormality of the primary voltage. The power supply monitoring part is separated from the reset part by multiple diodes so as to be provided in parallel with the reset part.

Distributed power supply circuit

An optical multiplex communication system includes a transmission part and a receiving part, wherein the transmission part includes a transmission quality detecting part which measures and transmits a transmission quality information for the channels based on a request from the transmission part; the receiving part includes a variable optical attenuation part controls the optical signal level for the channels, an optical level setting part controls the variable optical attenuation part based on a setting value, a setting control part adding the setting value to the optical level setting part based on a request for setting.

Optical multiplex communication system, optical transmission apparatus, and control method of optical multiplex communication

Growing community of inventors

Kawasaki, Japan

Yoshihisa Funami