Method and system for aligning the phase of high speed clocks in telecommunications systems
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United States of America Patent
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Jun 10, 1997
Grant Date -
N/A
app pub date -
Oct 14, 1993
filing date -
Oct 14, 1993
priority date (Note) -
Expired
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Abstract
A method and system are provided for detecting and measuring a phase difference, linearly over a range of 360.degree., between the output signals from a primary stratum clock module (100) and a standby stratum clock module (120) in a telecommunications system, calculating the amount of time needed to delay the standby clock signal (.o slashed.2) enough to cancel the phase difference, and controlling a digital delay line (132) to shift the phase of the standby clock signal (.o slashed.2) accordingly and thereby cancel the phase difference. Both the frequency and phase alignments of the two clocks are thus maintained. Therefore, when the system or user switches operations from the primary stratum clock module (100) to the standby stratum clock module (120), phase-related transients are not generated, which results in a significant increase in the overall performance and reliability of the system.
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