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:
Jan. 21, 2025
Filed:
Nov. 22, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Kaoru Arai, Musashino, JP;
Hiroki Sakuma, Musashino, JP;
Masahiro Nakagawa, Musashino, JP;
Shunichi Tsuboi, Musashino, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
[Problem] To provide a time synchronization mechanism that is not affected by link asymmetry between time synchronization devices. [Solution] A DCused in a time transmission system that transmits and receives a PTP packet between a master nodeand a slave nodevia the DCand synchronizes time of the slave nodebased on time information on the transmission and reception includes a PTP clock unitthat synchronizes time information by the arrived PTP packet, a frequency clock unitthat synchronizes time information by a frequency signal, a delay setting unitthat sets, such that a transmission delay of the PTP packet between the master nodeand the slave nodebecomes a setting delay Lmax, a waiting time of the PTP packet based on a time difference between a departure time of the PTP packet and an arrival time of the PTP packet at the DC, which is determined from the time information of the frequency clock unit, and a time adjustment unitthat corrects a time shift from reference time in the time information of the frequency clock unitbased on the time information of the PTP clock unit