The Furukawa Electric Co., Ltd.

Kazutaka Shimoosako

Kunio Odaka

Katsuya Aboshi

Masayuki Miura

Atsushi Kumagai

Takahiro Mochizuki

Hiroaki Rikihisa

Takumi Matsumoto

The communication system in an embodiment includes a server apparatus. The server apparatus includes a controller that issues an instruction for executing priority control when a priority vehicle passes through a place where a roadside unit is installed. The priority control prioritizes a first communication performed by the priority vehicle via the roadside unit over a second communication performed by anything other than the priority vehicle via the roadside unit.

Communication system, server apparatus, program and communication method

Provided are a communication device and a communication system in which multi-hop communication is possible and management of communication routes is easy. In a distribution-system communication device, a port management meansis provided in a communication control unit, and each of ports provided in a port sectioncan be managed with the port management meansby IP addresses of adjacent stations connected to each of the ports. In a port management meansof a master station, correspondence information between port numbers of the port sectionof each of the slave stations and the IP addresses of adjacent stations of a connection destination is input from the port management meansof each of the slave stations, and connection states between the ports of each of the slave stations can be managed based on the correspondence information.

Communication device and communication system

A communication system that performs communication route control includes a center node and at least one node connected thereto via a communication line. The node includes an error-detecting unit that detects an error in the communication route, a route request packet transmitting unit that broadcasts a new route request packet in response to the detection, a route answer packet receiving unit that receives a route answer packet transmitted from a node that is a target node or a node having a valid route to the target node or from the center node, and a communication route updating unit that updates a communication route based on the route answer packet. A node that is the target node or the node having a valid route to the target node or the center node transmits a route answer packet to the node in response to a route request packet transmitted from the node.

Communication system, communication route control method, and communication apparatus

An optical network unit according to the present invention is provided as comprising a configuration that component units built therein are grouped for at least two sheets of substrate modules and arranged thereat. There are provided individual embodiments: (a) arranging an L2 layer and a part of the component unit of an L1 layer at a first substrate module, meanwhile, arranging the left part of the component unit of the L1 layer at a second substrate module; (b) arranging the component units of the L1 layer and of the L2 layer at the first substrate module and the second substrate module individually by grouping therefor; and (c) arranging the component units of the L2 layer and of the L1 layer at the first substrate module and the second substrate module respectively.

Customer premises optical network unit and optical transmission system

A subscriber premises side optical network unit, and an optical transmission system having the same, is provided that monitors whether or not a communication condition is established with a center side optical line termination and halts signals to be outputted to external nodes when the communication condition is not established. In an optical network unit (ONU), a signal output control means monitors whether or not the communication condition with an OLT is established and when it determines that the communication condition is not established, outputs an output halting request to loopback setting sections to control to assume a loopback state. Thereby, it becomes possible to halt the output of the signals from an interface module to a switch.

Subscriber premises side optical network unit and optical transmission system

A customer premises optical network unit (ONU) comprises: an electrical/optical transform unitto be connected with an optical transmission pathat a central office side for performing an opto-electrical transform and an inverse opto-electrical transform; an ONU function partto be connected with an electric signal input and output terminal of the electrical/optical transform unit; a serial/parallel transform unitto be connected with a parallel signal terminal of the ONU function partfor performing a serial/parallel transform and an inverse serial/parallel transform; and a multi source agreement interface moduleto be connected with a serial signal terminal of the serial/parallel transform unit

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Tokyo, Japan

Kazutaka Shimoosako