Mitsubishi Denki Kabushiki Kaisha

Nippon Telegraph and Telephone Corporation

Masafumi Ando

Hirokazu Kobayashi

Takashi Ikeda

Shigeo Takata

Katsuhiro Araya

Hirotaka Masui

Masumi Sakamoto

Shinji Hattori

Hidesuke Hayakawa

Masaki Shinkai

Genichi Nishio

[Problem] To deal with interference in cases where a plurality of business operators perform testing at the same time at different MEG levels. [Solution] A network deviceincludes a frame distinguishing unitthat, upon receiving a start instruction for a test from a control device, monitors whether or not an OAM frame of a preceding test of a different level from a MEG level of an own device has arrived at the own device, for a predetermined period, and a CPUthat, if the frame distinguishing unitdetects arrival of the OAM frame, and determination is made that its own test will affect the preceding test, notifies the result of the detection and determination.

Network device and network test method

An owner concludes with a facility maintenance company a contract for maintenance of electric facilities and an operation control monitor device installed in a building of the owner. The electric facility manufacturer gives the company permission to access the device from a terminal through the Internet as a communication network. The company receives continuous monitor data items of the electric facilities collected by the device. The manufacturer accesses the device from a terminal through the network and also receives the continuous monitor data items of the electric facilities.

Facility management system and facility management method

Growing community of inventors

Tokyo, Japan

Masafumi Ando