Fujitsu Corporation

Tetsuya Uchida

Takashi Kuwabara

Katsuhiro Shirai

Hayato Furukawa

A transmission device includes: a payload generator configured to generate a payload; and an adding unit configured to add payload information on the payload to the payload, wherein the payload to which the payload information is added is transmitted via a first lane, and management information on the first lane is transmitted via a second lane.

Transmission device, transmission system, and transmission method

A communication device includes a control signal generating unit to generate a control signal for each of a plurality of second frames, and a mapping unit to map a payload signal of the plurality of second frames in a payload area of a first frame, and map at least some of the control signals generated by the control signal generating unit in a control signal area of the first frame.

Communication device and communication method

A transmission apparatus includes a processor that is operative to terminate a first line performing a communication using a digital wrapper, to terminate a signal on a second line performing a communication using Gigabit Ethernet, to apply a transparent transcoding process to a terminated signal and the signal received from the second line and to output these signals; and wherein when a fault occurs in a communication performed through the first line and when there is no response for a predetermined time period after an auto negotiation restart signal is reported to an opposite apparatus on a second line side, to report information indicating an occurrence of the fault to the opposite apparatus by using a signal of a MAC (Media Access Control) frame format.

Transmission apparatus and reporting method for reporting fault

In a virtual ring configuration method and a virtual ring system, a plurality of nodes are set on a plurality of rings and the rings are cross-connected. Each node has a transmitting unit and a receiving unit for sending and receiving service information between the nodes by the SONET path. A judging unit is provided for judging whether or not there is an input of obstruction information by the SONET path. A path protection switch is provided at a receive terminal, which switches the receive terminal which receives the SONET path in cases where the judging unit judges that obstruction information has been received.

Virtual ring configuration method and virtual ring system

An optical interface in a SONET system, wherein the optical interface includes a first multiplex/demultiplex apparatus for multiplexing/demultiplexing higher level signals of the main line side and lower level signals of the subscriber side and performing electrical/optical conversion of the lower level electrical signals and optical signals. An optical transmission line is provided for transmitting the optical signals. A second multiplex/demultiplex apparatus converts between the optical signals and a plurality of subscriber side line digital electrical signals. The overhead signals contained in the lower level signals and reaching the first multiplex/demultiplex apparatus are also contained in the optical signals and are transferred further from the first multiplex/demultiplex apparatus to the second multiplex/demultiplex apparatus.

Optical interface in SONET system

A node for a ring type synchronous optical network can continue to communicate with another node, when a transmission path is interrupted, located on the opposite side of the interrupted transmission path. A cross connecting unit cross connects the ring type transmission path with an external transmission path. The cross connecting unit generates and sends to another node an alarm indication signal when the ring type optical path is interrupted. A path switching unit switches the connection of an external transmission path to either direction of the ring type transmission path. A controlling unit controls the path switching unit, when an alarm indication signal is received from another node, so that the path switching unit switches the connection to a side opposite to a side from which the alarm indication signal has been received.

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Kawasaki, Japan

Tetsuya Uchida