PON SYSTEM, OPTICAL NETWORK UNIT USED FOR SAME, AND METHOD FOR CONTROLLING TRANSMISSION THEREOF

摘要

An optical network unit (2) is prevented from uploading data the quantity of which is unexpected by an optical line terminal (1), in order to improve precision of band control performed by the optical line terminal (1). The optical network unit (2) in a PON system is capable of two-way optical communication with the optical line terminal (1) via a passive optical branch node (6), and uploads an FEC frame including a variable-length frame to the optical line terminal (1). The optical network unit (2) is provided with a grant processing section (207) which determines whether or not an assigned amount described in a grant G1 of a report request is one unit data amount (1FCW) of an FEC frame, and a frame transmission section (206) which transmits only a report (R) to the optical line terminal (1) when the result of the determination is affirmative.