18705340. TIME SYNCHRONIZATION DEVICE, TIME SYNCHRONIZATION METHOD, AND PROGRAM (NIPPON TELEGRAPH AND TELEPHONE CORPORATION)
Contents
TIME SYNCHRONIZATION DEVICE, TIME SYNCHRONIZATION METHOD, AND PROGRAM
Organization Name
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Inventor(s)
Keisuke Yamagata of Tokyo (JP)
Shinichi Yoshihara of Tokyo (JP)
Takashi Nakanishi of Tokyo (JP)
TIME SYNCHRONIZATION DEVICE, TIME SYNCHRONIZATION METHOD, AND PROGRAM
This abstract first appeared for US patent application 18705340 titled 'TIME SYNCHRONIZATION DEVICE, TIME SYNCHRONIZATION METHOD, AND PROGRAM
Original Abstract Submitted
A boundary clock () as a time synchronization device according to the present disclosure includes: an offset calculation unit () that calculates an offset that is a difference between device internal time of a higher-level device and device internal time of an own device; a transmission delay time calculation unit () that calculates a transmission delay time of a packet transmitted and received between the higher-level device and the own device; and a determination unit () that determines an occurrence location of a failure in time synchronization with the higher-level device on the basis of the offset and the transmission delay time, and stops synchronization of device internal time of a lower-level device with the device internal time of the own device in a case where it is determined that the occurrence location of the failure is the higher-level device.
