Method and apparatus for controlling communications in a passive optical network
CA 2295563 C · Owner: Bell Communications Research, Inc. · Inventors: Effenberger, Frank J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and system provide a unique communication and protocol between an optical line termination device and a plurality of optical network units sitting at different distances from the optical line termination device. The OLT determines the distances between it and each ONU (302) and then requests communications from the ONUs in ascending order from the nearest to farthest (306, 308). The OLT also determines a time delayed period between the nearest ONU and the farthest ONU and awaits that time delay period (312) before initiating subsequent ONU communication with the ONUs.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 9, 1998 and granted April 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 9, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.