Patents by Inventor Piet Van Hevingen

Piet Van Hevingen 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).

  • Fast protection switching by snooping on upstream signals in an optical network
    Patent number: 6868232
    Abstract: An optical network has an optical splitter connected to (1) a working optical subscriber unit (OSU) of a working circuit via a working optical fiber, (2) a protection OSU of a protection circuit via a protection optical fiber, and (3) one or more optical network terminals (ONTs). The present invention enables fast protection switching from the working OSU to the protection OSU. In one embodiment, the arrival times of corresponding upstream ranging reply PLOAM cells are measured at both the working and protection OSUs during ranging operations of the working OSU. In another embodiment, a cell delineation procedure is initiated at the protection OSU during normal, non-ranging operations of the working OSU to enable the protection OSU to correctly delineate upstream cells and the arrival times of corresponding upstream cells are then measured at both the working and protection OSUs.
    Type: Grant
    Filed: February 12, 2001
    Date of Patent: March 15, 2005
    Assignee: Lucent Technologies Inc.
    Inventors: Peter Van Eijk, Reed K. Even, Piet Van Hevingen, Song Jiang, Kyeong-Soo Kim, Woojune Kim, Fengkun Liu, Yong-Kwan Park