Method and system for aligning the phase of high speed clocks in

Details Method and system for aligning the phase of high speed clocks in Method and system for aligning the phase of high speed clocks in

1993-10-14

1997-06-10

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronization failure prevention

375371, 375373, 375376, 327 5, 327 7, 327 12, 327149, 327156, 327161, 327163, H04L 700

Patent

active

056384106

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.

REFERENCES:
patent: 4851784 (1989-07-01), Wells et al.
patent: 4864252 (1989-09-01), Heck
patent: 4902920 (1990-02-01), Wolaver
patent: 4959617 (1990-09-01), Martin
patent: 5081655 (1992-01-01), Long
patent: 5109394 (1992-04-01), Hjerpe et al.
patent: 5173617 (1992-12-01), Alsup et al.
patent: 5376847 (1994-12-01), Staszewski

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