System and method for timing references for line interfaces

Details System and method for timing references for line interfaces System and method for timing references for line interfaces

2006-02-14

2006-02-14

Ghebretinsae, Temesghen (Department: 2637)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S376000, C375S354000, C327S144000, C327S147000

Reexamination Certificate

active

06999546

ABSTRACT:
A system (10) and method are provided for phase aligning two timing signals when the timing signals are out of phase. The system (10) includes a selection unit (12) coupled to timing sources (14, 16), a detection means (18, 20) coupled to the selection unit (12) for detecting a failure and causing the selection unit (12) to switch to another timing source, and a unit coupled to the selection unit for phase comparing, wherein the unit introduces gradual phase alterations to the second timing signal until the first and second timing signals are in-phase. The method includes switching to a timing source to provide the time signal when a failure is detected in an existing timing source, comparing the phase of the timing signal to a second timing signal to determine the relative phases of the timing signals, and gradually phase shifting the second timing signal until the timing signals are in-phase

REFERENCES:
patent: 5577075 (1996-11-01), Cotton et al.
patent: 6119016 (2000-09-01), Matusevich

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