Patent ID: 9112772
Filing Date: 2015-08-18
Classification: H04B,H04L,H04Q

Abstract:
1. An Optical Line Terminal that is connected to a plurality of Optical Network Units via a Passive Optical Network and connected to a host apparatus via a Service Node Interface and mutually transfers a frame to be exchanged between the Optical Network Units and the host apparatus, comprising: a storage device that stores processing data as a target of software processing; a frame demultiplexing unit that demultiplexes and outputs one of a control frame to be used in the Passive Optical Network and a control frame to be used in the software processing from an upstream frame received from the Optical Network Unit via the Passive Optical Network; and a control frame processing unit that counts the number of control frames from said frame demultiplexing unit for each of individual Logical Link IDs of the Optical Network Units given to the control frames, if the number of frames during a predetermined count period is not more than a preset threshold, writes data formed from some or all of the control frames having the Logical Link ID in said storage device as the processing data, and when the number of frames has exceeded the threshold, stops writing data of the control frames having the Logical Link ID in said storage device, wherein said frame demultiplexing unit comprises: a frame determination unit that determines a transfer destination and a frame type of the upstream frame based on header information of the upstream frame; a data giving unit that gives the transfer destination and the frame type of the upstream frame determined by said frame determination unit to the upstream frame; and an output destination selection unit that transfers the upstream frame from said data giving unit to one of said control frame processing unit and a frame transfer processing unit based on the transfer destination given to the upstream frame, and said control frame processing unit comprises: an individual counter that counts, for each Logical Link ID given to the control frames, the number of control frames for which the frame type given to the control frames is a specific frame type out of the control frames from said frame demultiplexing unit; and a write control unit that controls for each Logical Link ID, write of the data of the control frames as a count target having the Logical Link ID in said storage device based on a comparison result between the threshold and a count result of said individual counter.