The Furukawa Electric Co., Ltd.

Katsuya Aboshi

Kunio Odaka

Kazutaka Shimoosako

Kazutaka Simoosako

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

There is provided a customer premises optical network unit (ONU) capable of reading management signals and of outputting data through an external node by using IC serial interfaces. In the ONU, an ONU functioning section has another serial signal terminal and is connected with a first management processing section through a sub-serial transmission path. The first management processing section is also connected with a MSA interface module through an additional monitoring signal transmission path and a monitoring signal transmission path. The monitoring signal transmission path on the side of the MSA interface module is connected with a sub-I/F section. A part of management signals set in an OAM layer of a signal transmitted between an OLT and the ONU may be outputted to an external node by using the first management processing section, the additional monitoring signal transmission path and the monitoring signal transmission path.

Customer premises optical network unit

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

Katsuya Aboshi