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AssigneeNippon Telegraph and Telephone Corporation
InventorsKaoru Arai, Hiroki Sakuma, Masahiro NAKAGAWA, Shunichi Tsuboi
Estimating the term…
[Problem] A time synchronization mechanism with which an impact of link asymmetry between time synchronization devices is reduced is provided. [Solution] A SW 3 used in the time transmission system in which a master node 1 and a slave node 2 performs transmission and reception of a PTP packet via the SW 3 and the time of the master node 1 is synchronized based on time information of the transmission and reception includes a delay calculator 32 that measures an intra-device delay between input and output of the PTP packet to and from the SW 3, and a delay information writing unit 33 that appends the intra-device delay measured by the delay calculator 32 to a packet subsequent to the PTP packet, and outputs the appended packet to an output destination of the PTP packet.
A transmission device used in a time transmission system in which a time synchronization packet is transmitted and received between time synchronization devices via the transmission device, and time of each of the time synchronization devices is synchronized based on time information of transmission and reception of the time synchronization packet, the transmission device comprising:
A delay measurement method performed by a transmission device used in a time transmission system in which a time synchronization packet is transmitted and received between time synchronization devices via the transmission device, and time of each of the time synchronization devices is synchronized based on time information of transmission and reception of the time synchronization packet, the transmission device including a delay calculator and a delay information writing unit, the method comprising:
Dependencies are inferred from the claim text.