Nippon Telegraph and Telephone Corporation

Ryogo Kubo

Jun-ichi Kani

Akihiro Otaka

Junichi Kani

Yukihiro Fujimoto

Mitsumasa Okada

Jun-Ichi Kani

An optical line terminal which includes an observing unit that observes information of any one or all of an arrival interval of frames, an instantaneous bandwidth under use of a flow, a queue length of a queue temporarily storing the frames, and a traffic type, and a stop determining unit that dynamically determines a sleep time to be a period in which a sleep state where partial functions of the ONU are stopped is maintained, on the basis of the information obtained by the observing unit. The ONU is entered into a sleep state, immediately after communication ends, after a predetermined waiting time passes from when the communication ends, or after a waiting time determined on the basis of the information passes from when the communication ends.

Optical line terminal and optical network unit

ONUA for P-P includes a signal-type discriminating unitA that discriminates whether a type of a downstream signal transmitted from OLT is for the P-P or not, and outputs an enable/disable control signal that controls an optical transmitter to an enable state or a disable state, and a control unitthat controls the optical transmitter to the enable state or the disable state according to the enable/disable control signal, wherein the signal-type discriminating unitA outputs to the control unita disable control signal that controls the optical transmitter to the disable state under an initial state before the type of the downstream signal is discriminated, and outputs to the control unitan enable control signal that controls the optical transmitter to the enable state after the downstream signal is discriminated to be for the P-P.

Optical network unit

Growing community of inventors

Yokosuka, Japan

Ryogo Kubo