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:
Dec. 07, 2021
Filed:
Mar. 04, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Kaoru Arai, Tokyo, JP;
Hiroki Sakuma, Tokyo, JP;
Takaaki Hisashima, Tokyo, JP;
Ryuta Sugiyama, Tokyo, JP;
Shunichi Tsuboi, Tokyo, JP;
Osamu Kurokawa, Tokyo, JP;
Kazuyuki Matsumura, Tokyo, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
[Problem] It is possible to improve the quality of time information by suppressing a jump in time which arises when switching a transfer path in a BC apparatus to which transfer paths of time information of at least 2 systems are connected to an input side. [Solution] A time synchronization apparatusis mounted on a BC apparatusin which two systems of at least a 0-system route (0-system) and a 1-system route (1-system) are connected to an input side, and includes a time correction value holding unitconfigured to hold a 0-system correction value in which a time error resulting from delay of UTC due to performance inherent to the BC apparatus is the same value as a time error accumulated on the 0-system side and a 1-system correction value in which the time error is the same value as a time error accumulated on the 1-system side. Further, a failure restoration detection unitconfigured to detect a failure in the 0-system or the 1-system, a time calculation unitconfigured to perform correction by subtracting a 1-system correction value relating to a normal 1-system from UTC having time error accumulated on the normal 1-system side, when a failure in the 0-system is detected, and a path switching unitconfigured to switch to the normal 1-system side such that the UTC after correction is transferred, when the failure is detected, are included.