At+t Corp.

Tti Inventions a LLC

Ronald A Skoog

Patrick Ahamad Hosein

Haim Kobrinski

Russell Fischer

Joel Wright Gannett

Sarry Habiby

Thomas Clyde Banwell

A method and system to economically monitor an optical OOK signal that can detect perceptible changes in signal quality and identify the type of optical impairment causing the change. The invention requires a new and novel combination of known techniques to create an eye diagram of the transmitted pulse in a wavelength division multiplexing systems and then removing the noise from the eye diagram. Economy of operation is achieve by using asynchronous sampling techniques for generating the eye diagram. The resulting 'cleaner' eye diagram is then analyzed to identify any changes in performance. In the preferred embodiment, the analysis is conducted on histograms generated from eye diagram, the histograms are computed at a number of points across the optical signal pulse period.

Methods and systems for optical performance monitoring

A method and apparatus for synchronizing the process of updating a plurality of distributed databases is disclosed. In accordance with an embodiment of the present invention, known database management software executed by a general purpose computer connected to each of the plurality of distributed databases is modified to include the ability to limit the number of data updates which may be outstanding to the plurality of distributed databases during any particular period of time. The modified database management software monitors the number of data updates which have been sent to each of the plurality of distributed databases and only sends additional data updates to each of the plurality of distributed databases if the number of outstanding updates is less than a predetermined maximum number of outstanding data updates.

Method and apparatus for synchronizing the provision of data among geographically distributed databases

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Shrewsbury, NJ, United States of America

Ronald A Skoog