Patents by Inventor Roland Chan

Roland Chan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for N+1 RF switch with passive working path and active protection path
    Patent number: 7817540
    Abstract: The present disclosure relates an improved cable data switching unit that provides a fail-over system whereby one line card can protect a plurality of US (upstream) or DS (downstream) channel line cards, providing N+1 protection, with one linecard being able to protect N number of working linecards. When a failure is detected in a working linecard, the signals being routed by the failing linecards are re-routed seamlessly to a protect linecard. This disclosure provides for data to be passively routed, providing for data flow even if power is lost.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: October 19, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Feisal Daruwalla, John T. Chapman, Richard Meller, Roland Chan, Nicos Achilleoudis