Patent Number: 8,798,460

Title: Optical access system, optical network unit, and optical line terminal

Abstract: It is provided an optical access system, comprising an optical line terminal which is coupled to another network and optical network units which are coupled to the optical line terminal and to a plurality of user terminals. Each of the optical network units obtains a capacity of a buffer included in the each of the optical network unit and a link speed between the each of the optical network units and one of the plurality of user terminals that is coupled to the each of the optical network units; determines a sleep time based on the obtained capacity and the obtained link speed in a case where no communication frames are transmitted for a given period of time from any one of the plurality of user terminals and the optical line terminal; and sets in a sleep state for the determined sleep time.

Inventors: Konno; Satoshi (Yokohama, JP), Oosawa; Noboru (Yokohama, JP), Kazawa; Tohru (Kokubunji, JP)

Assignee: Hitachi, Ltd.

International Classification: H04B 17/00 (20060101)

Expiration Date: 8/05/12018