Transmission device and time synchronization method
AssigneesFujitsu Limited, Fujitsu Telecom Networks Limited
InventorsMITSUYA KAWASHITA, SHOTA MORI, KAZUHIRO KUNIMATSU
Life of this patent
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Abstract
A transmission device includes a control card and a plurality of IF cards. The control card receives first set time from a host PC and calculates second set time by adding add time corresponding to one cycle of a clock signal that is commonly used by the control card and the IF cards to the first set time. The control card distributes the second set time to each of the IF cards. After each of the IF cards receives the second set time and sets the second set time in an internal timer, when a clock signal is detected, each of the IF cards starts a time measuring operation of the internal timer from the second set time.
Claims5
A transmission device comprising:
- a first unit;
- and
- a plurality of second units,
- wherein the first unit includes
- a creating unit that creates second set time after a predetermined time has elapsed from first set time, and
- a distributing unit that distributes the created second set time to each of the second units, and
- each of the second units includes
- a clock unit that starts, after the second set time is received and the second set time is set in an internal timer, when a clock signal that is commonly used by the first unit and the second units is detected, a time measuring operation of the internal timer from the second set time.
A time synchronization method performed in a transmission device that includes a first unit and a plurality of second units, the time synchronization method causing the transmission device to execute a process comprising:
- creating, performed by the first unit, second set time after a predetermined time has elapsed from first set time;
- distributing, performed by the first unit, the created second set time to each of the second units;
- and
- starting, performed by each of the second units, after the second set time is received and the second set time is set in an internal timer, when a clock signal that is commonly used by the first unit and the second units is detected, a time measuring operation of the internal timer from the second set time.
Dependencies are inferred from the claim text.