Time synchronization method and relay apparatus

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels

Reexamination Certificate

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C375S356000

Reexamination Certificate

active

08081663

ABSTRACT:
A time synchronization method for synchronizing times of a first apparatus and a second apparatus includes transmitting, by the first apparatus, a packet to the second apparatus, the packet including the time of the first apparatus, providing, by a relay apparatus that relays the packet, a value to the packet, the value indicating a reception time upon the reception of the packet, providing, by the relay apparatus, a difference between the value provided to the packet in the providing of reception time and a current time to the packet upon the transmission of the packet, the difference serving as a delay value, and executing, by the second apparatus, a control for time synchronization based on the time of the first apparatus included in the packet and the delay value provided to the packet.

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patent: 1 717 978 (2006-11-01), None
patent: 2007-20183 (2007-01-01), None
European Search Report dated Mar. 29, 2011, from corresponding European Application No. 09 16 8715.
Sivaram Balasubramanian, et al. “Investigation of IEEE 1588 on Gigabit Ethernet, Priority Tagged Frames and Ethernet Daisy Chain” Proceedings of the IEEE-1588 Conference, Oct. 10, 2005.
George Gaderer, et al. “Extending IEEE 1588 to Fault Tolerant Clock Synchronization” Factory Communication Systems, 2004, Sep. 22, 2004, pp. 353-357.

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