Optical transmission apparatus

摘要

An HO ODU signal input to an optical transmission apparatus is disassembled into LO ODUs. LO ODUs specified to form an aggregated ODU are disassembled not into individual LO ODUs but into a unit of an LO ODU group that forms an aggregated ODU. Clock extraction and an alarm process are performed not for the individual LO ODUs but for each aggregated ODU. This eliminates the need for a hardware configuration for performing the clock extraction and the alarm process in units of LO ODUs, leading to saving of hardware resources.

主权项

1. An optical transmission apparatus in a network for making a one-to-multi communication by establishing paths from one point to multi points, the optical transmission apparatus comprising:
a reception side high-order layer data unit processing circuit configured to demultiplex a first aggregated data unit of a plurality of data units of a low-order layer from other data units of a low-order layer, the plurality of data units of the low-order layer being transmitted by using a plurality of paths sharing a section within the network and aggregated into the first aggregated data unit as one aggregation, when data is transmitted in the section shared by the plurality of paths in a process for extracting data units of a low-order layer from a data unit of a high-order layer of an input optical signal; a reception side low-order layer data unit processing circuit configured to perform clock extraction in a unit of the first aggregated data unit, and to execute an alarm process in the unit of the first aggregated data unit; a switching circuit configured to perform switching by disassembling an output of the reception side low-order layer data unit processing circuit into internal frames for switching, and to generate data units of a low-order layer from the internal frames for switching after the switching is performed; a transmission side low-order layer data unit processing circuit configured to aggregate the plurality of data units of the low-order layer transmitted by using the plurality of paths sharing the section among the data units of the low-order layer formed after the switching is performed into a second aggregated data unit of a low-order layer as one aggregation, and to insert alarm information, obtained by the reception side low-order layer data unit processing circuit, in the second aggregated data unit; and a transmission side high-order layer data unit processing circuit configured to assemble the second aggregated data unit from the transmission side low-order layer data unit processing circuit into a data unit of a high-order layer, and to transmit the assembled data unit.