Patents by Inventor Wing Cheong Chang

Wing Cheong Chang 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).

  • Background test system for time division multiplexing switching systems
    Patent number: 6931022
    Abstract: A method for testing a transmission system is disclosed. The method comprises receiving a time division multiplexed (TDM) stream on an input of the transmission system. The method also comprises inserting test data in one or more of the plurality unused fields of the TDM stream. Additionally, the method comprises transferring the TDM stream along a plurality of components of the transmission system and comparing the test data against the transferred test data.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: August 16, 2005
    Assignee: Cisco Technology, Inc.
    Inventors: Kirk Dow Sanders, Wing Cheong Chang