| 摘要 |
An object of the present invention is to improve the accuracy of bandwidth control by an optical line terminal 1 by preventing an optical network unit 2 from performing upstream transmission of an amount of data that is not expected by the optical line terminal 1. The optical network unit 2 of the present invention is an optical network unit in a PON system, which is capable of performing bidirectional optical communication with the optical line terminal 1 through a passive light-splitting node 6, and which performs upstream transmission of a FEC frame including a variable length frame to the optical line terminal 1. The optical network unit 2 includes a grant processing unit 207 that determines whether an amount of allocation specified in a grant G1 which is a report request is one unit amount of data (one FCW) of the FEC frame; and a frame transmitting unit 206 that transmits only a report R to the optical line terminal 1 if a result of the determination is affirmative.
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