System and method for maintaining a common sense of time on...

Details System and method for maintaining a common sense of time on... System and method for maintaining a common sense of time on...

2006-06-06

2006-06-06

Duong, Frank (Department: 2666)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C713S400000

Reexamination Certificate

active

07058089

ABSTRACT:
The system has a control center, a time master device and a plurality of distributed, time slave field devices in synchronization with a master clock of the time master device. The time master device periodically transmits a time distribution data unit. Each time slave field device has a timer adjustment element, a fixed rate clock and a variable clock. The timer adjustment element calculates a frequency ratio between the master clock and the fixed rate clock and uses the frequency ratio to calculate adjustment coefficients to adjust a local sense of time for each field device, such that a time stamp of each field device is synchronized to the master clock.

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