Method and apparatus for synchronizing clocks on...

Details Method and apparatus for synchronizing clocks on... Method and apparatus for synchronizing clocks on...

2004-09-15

2008-10-21

Patel, Ajit G (Department: 2616)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S516000

Reexamination Certificate

active

07440474

ABSTRACT:
The present invention is directed to the synchronization of clock frequencies across packet data networks. In particular, one or more communication endpoints may produce a clock signal that is synchronized to a master clock source. Synchronization is performed by providing timing packets containing information regarding a number of clock cycles counted on the master clock source to a controlled clock source. The controlled clock source uses the provided count to increment a counter value. At the same time, the counter value on the controlled clock source is decremented by the controlled clock source clock. The resulting counter value is used to address a correction table. A correction value from the correction table is applied to the frequency control input of the controlled clock source clock.

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Mills, David L., “RFC 1305 Network Time Protocol (Version 3) Specification, Implementation,” Univ. of Delaware, Mar. 1992, pp. 1-108.

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