Fujitsu Corporation

Kazuaki Nagamine

Toshihiro Suzuki

Ichiro Nakajima

Shingo Hara

Miwa Taniguchi

Eiji Iida

Tomoyuki Kanzaki

Takuma Shouji

Toru Taniguchi

Kazuhiko Shiba

An optical transmission device in an optical network in which a first optical path and a second optical path are set, the optical transmission device locating on the second optical path, the optical transmission device includes; a storage unit configured to store control data for a control of an optical transmission power to the second optical path, the control being performed based on a training signal received through the second optical path; and a controller configured to control the optical transmission power to the second optical path, based on the control data stored in the storage unit, according to a detection of an optical path change by which an optical path transmitting a main signal is changed from the first optical path to the second optical path.

Optical transmission device, optical transmission system, and optical transmission control method

An optical transmission apparatus includes: a variable optical attenuation section configured to independently adjust, for each wavelength, attenuation of light of a plurality of wavelengths and adjust output optical power of wavelength multiplexed light that is output to an optical transmission line by adjustment of the attenuation; and a control section configured to stop, in accordance with control in which a wavelength included in the wavelength multiplexed light in a first wavelength band is wavelength-shifted to a second wavelength band that is different from the first wavelength band, adjustment of attenuation performed on the first wavelength band by the variable optical attenuation section.

Optical transmission apparatus and optical transmission control method

A transmission apparatus includes: a first output unit configured to generate a first optical signal of which a first wavelength is variable and control the first wavelength to be close to a second wavelength of a second optical signal transmitted as a multiplexed optical signal with the first optical signal, the first output unit outputting the first optical signal to another transmission apparatus; and a second output unit configured to generate a third optical signal that is replication of the first optical signal in a wavelength band opposite to the first wavelength across the second wavelength, the second output unit outputting the third optical signal to the another transmission apparatus, wherein the first output unit stops outputting the first optical signal when the another transmission apparatus switches an optical signal to be received from the first optical signal to the third optical signal.

Transmission apparatus and transmission system

A route setting apparatus having a processor and a memory which stores an instruction to cause the processor to generate a layer label in which a first signal type for transmission of a main signal is described on a layer-by-layer basis, to store, on a layer-by-layer basis, a score correspondingly associated with one or more of second signal types, and to generate data based on the score correspondingly associated for one of the second signal types that matches the first signal type in the layer label. The instruction causes the processor to determine an optimal route based on the generated data which includes data received from another apparatus included in a route for the transmission of the main signal, and transmit and receive the layer label and the generated data.

Route setting apparatus, route setting method, and network system

In an apparatus having data installed therein, the apparatus includes a data storage part for storing a (n+1)th-order file obtained by bundling an nth-order file and (n+1)th data corresponding to an (n+1)th function level into one file, wherein n is an integer, an identifier storage part for storing an identifier indicating a function level of data to be installed in the apparatus, and a controller for detecting the function level based on the identifier stored in the identifier storage part, de-bundling the (n+1)th-order file stored in the data storage unit as many as times corresponding to the function level, and applying the de-bundled data to the apparatus.

Apparatus having data installed and method of upgrading data

A relay station has an optical switch that switches a reception path of an optical signal. The relay station generates a subsignal that has a wavelength different from the wavelength of a data signal corresponding to a signal to be transmitted and transmits an optical signal obtained by multiplexing the generated subsignal and the data signal. In this state, when the data signal is not included in the received optical signal, the relay station determines whether the subsignal is included in the optical signal. When it is determined that the subsignal is included, the relay station maintains a connection path of the optical switch without switching the connection path.

Light transmission device, optical relay device, optical wavelength multiplexing transmission apparatus, and light transmission method

To provide a transmission apparatus capable of setting the same control data to the entire child transmission apparatuses instantaneously at a time, thereby leading to improved maintenance operation and bringing about efficient maintenance and system stability. The transmission apparatus receives from a maintenance operator a designation of a parent apparatus having the control data set in advance. That control data is to be inherited to a child apparatus. The transmission apparatus determines whether any transmission apparatus has already been registered as parent apparatus in the child apparatus, and also determines whether the designated parent apparatus has already been registered as a child apparatus in the child apparatus. The transmission apparatus then requests the designated parent apparatus to transfer the control data in the designated parent apparatus to the child apparatus, when the designated parent apparatus is not registered in the child apparatus.

Inheritance control method of network control data between transmission apparatuses and transmission apparatus using the same

When a primary failure occurs, each agent device (information processing device) checks itself to determine whether non-notification setting has been performed for alarm notification of the primary failure. If no non-notification setting has been performed, the agent device sends the alarm notification to a manager device (network management device). At the same time, the agent device sends a set alarm mask request to the agent device located downstream in the signal flow to request to perform non-notification setting for alarm notification of a secondary failure caused by the primary failure.

Information processing device, failure notification method, and computer product

The present invention provides a node device for connecting a plurality of networks. The node device comprises a plurality of input units for respectively inputting data from first transmission lines installed in each of the networks, a plurality of output units for respectively outputting data to second transmission lines installed in each of the networks, and a switching unit for switching the data input from the input units to the output units. The input unit that inputs data from a transmission line shared by the networks among the first transmission lines has a higher transmission speed than other input units.

Node device in network, and network system

When a tunable laser is operating at any one of the different wavelengths, wavelength data is sampled and stored in a memory device. In the case where the same operating wavelength as a wavelength hitherto operated needs to be reset to the tunable laser, the wavelength data stored in the memory device is set to the tunable laser. This makes it possible to avoid a shift in wavelength due to age degradation of the tunable laser that selectively outputs any one of light signals of different wavelengths in dependence on the wavelength data set to the tunable laser.

Method and unit for setting a wavelength to a tunable laser

A node apparatus for a ring network arranged in a multi-ring formation includes a routing table that defines relationships between a receiving physical line identifier with port number and a sending physical line identifier with port number for virtual ring bypass routes, the relationships being individually provided for respective transmission lines connected to the node apparatus. A detection unit detects, at a time of detection of a failure, each of the relationships from the routing table to determine a transmission line to which a switching request is sent. The detection unit detects, at a time of relaying, each of the relationships from the routing table to determine a transmission line to which one of a switching request and a switching response is sent. The detection unit detects, at a time of receiving of a switching request, each of the relationships from the routing table to determine a transmission line to which a switching response is sent.

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Kawasaki, Japan

Kazuaki Nagamine