Method and apparatus for a hitless switch-over between redundant

Details Method and apparatus for a hitless switch-over between redundant Method and apparatus for a hitless switch-over between redundant

1996-11-12

1998-04-14

Ghebretinsae, T.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375376, 370516, 327147, H04L 700

Patent

active

057402116

ABSTRACT:
Real time switch overs from one set of timing signals to a redundant set of timing signals in an ATM system, as required by periodic maintenance checks, are accomplished without incurring data errors by this apparatus and method. Each switch over apparatus has a phase locked loop with a controlled control loop which assists the phase locked loop in rapidly achieving nearly perfect phase locks to one of multiple system reference clocks. The characteristics of the special phased locked loop provide the stability and the timing functions necessary for switch overs between reference clocks to produce errorless ATM signal handling.

REFERENCES:
patent: 5260979 (1993-11-01), Parker et al.
patent: 5475719 (1995-12-01), Gurtler et al.
patent: 5515403 (1996-05-01), Sloan et al.
patent: 5631896 (1997-05-01), Kawase et al.

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