The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2023
Filed:
Feb. 06, 2020
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Masahiro Nakagawa, Tokyo, JP;
Kaoru Arai, Tokyo, JP;
Hiroki Sakuma, Tokyo, JP;
Shunichi Tsuboi, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
A time synchronization mechanism is provided. A second transmission device includes: a transmission section configured to transmit packets for delay calculation for a plurality of wavelengths to the corresponding time transmission device simultaneously; and a reception section configured to calculate a propagation delay Dms on a path from the corresponding time transmission device to the second transmission device based on a difference between the arrival times of the packets for delay calculation for the plurality of wavelengths received, receive a propagation delay Dsm on a path from the second transmission device to the corresponding time transmission device calculated, and calculate a propagation delay Dmax that is larger than any of the propagation delay Dms and the propagation delay Dsm. The reception section transmits a received PTP packet to a slave node after a waiting delay Wms calculated by subtracting the propagation delay Dms from the propagation delay Dmax.