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    2.
    发明专利
    未知

    公开(公告)号：DE69732816T2

    公开(公告)日：2005-09-01

    申请号：DE69732816

    申请日：1997-05-20

    Applicant: NEC CORP

    Inventor： SHIRAGAKI TATSUYA

    IPC: H04B10/03 ,  H04B1/74 ,  H04B10/032 ,  H04B10/038 ,  H04B10/077 ,  H04B10/291 ,  H04J3/14 ,  H04J14/02 ,  H04J14/08 ,  H04L1/22 ,  H04L12/28 ,  H04L12/43 ,  H04L12/437 ,  H04Q3/00 ,  H04Q11/00 ,  H04L29/14

    Abstract: In a communications network, shared spare routes and dedicated spare routes are provided between nodes of adjacent pairs and a dedicated spare path are provided between terminal nodes. Each of the dedicated and shared spare routes comprises a link or a series of permanently connected links. A first signal requiring a quick fault restoration performance is transmitted over the first working path and a second signal not requiring the quick fault restoration performance is transmitted over the second working path. The working paths and all working links are monitored to detect a path or link failure. If the first working path is affected by a path failure, the first signal is instantly switched to the dedicated spare path, and if it is affected by a link failure, the first working path is reestablished using one of the dedicated spare routes. If the second working path is affected by a path failure, an alternate path is established between the terminal nodes using the shared spare routes and the second signal is switched to the alternate path and if it is affected by a link failure, an alternate route is established using one of the shared spare routes and the second working path is reestablished using the alternate route.

    5.
    发明专利
    未知

    公开(公告)号：DE69835193T2

    公开(公告)日：2007-05-31

    申请号：DE69835193

    申请日：1998-11-30

    Applicant: NEC CORP

    Inventor： SHIRAGAKI TATSUYA ,  HENMI NAOYA ,  NISHIO MAKOTO ,  TAKESHITA HITOSHI ,  SHIMOMURA HIROFUMI

    IPC: H04J14/02 ,  H04L12/437

    Abstract: In a ring topology network, a number of nodes interconnect transmission links to form first and second working rings and first and second optical protection rings in a ring topology. Multiple working paths are established on each working ring and multiple protection paths are established on each protection ring corresponding to the working paths. A first working path spans across first and second nodes for transmission of a signal in a first direction of the ring topology, and a second working path of the second working ring spans across the first and second nodes for transmission of a signal in a second direction of the ring topology opposite to the first direction A first protection path on the first protection ring spans across the first and second nodes for transmission of a signal in the second direction of the ring topology, and a second protection path of the second protection ring spans across the first and second nodes for transmission of a signal in the first direction of the ring topology. The first and second nodes normally use the first and second working paths, respectively. Responsive to a failure of one of the first and second working paths, the first and second nodes use a corresponding one of the first and second protection paths, instead of the failed working path.

    7.
    发明专利
    未知

    公开(公告)号：DE69732816D1

    公开(公告)日：2005-04-28

    申请号：DE69732816

    申请日：1997-05-20

    Applicant: NEC CORP

    Inventor： SHIRAGAKI TATSUYA

    IPC: H04B10/03 ,  H04B1/74 ,  H04B10/032 ,  H04B10/038 ,  H04B10/077 ,  H04B10/291 ,  H04J3/14 ,  H04J14/02 ,  H04J14/08 ,  H04L1/22 ,  H04L12/28 ,  H04L12/43 ,  H04L12/437 ,  H04Q3/00 ,  H04Q11/00 ,  H04L29/14

    Abstract: In a communications network, shared spare routes and dedicated spare routes are provided between nodes of adjacent pairs and a dedicated spare path are provided between terminal nodes. Each of the dedicated and shared spare routes comprises a link or a series of permanently connected links. A first signal requiring a quick fault restoration performance is transmitted over the first working path and a second signal not requiring the quick fault restoration performance is transmitted over the second working path. The working paths and all working links are monitored to detect a path or link failure. If the first working path is affected by a path failure, the first signal is instantly switched to the dedicated spare path, and if it is affected by a link failure, the first working path is reestablished using one of the dedicated spare routes. If the second working path is affected by a path failure, an alternate path is established between the terminal nodes using the shared spare routes and the second signal is switched to the alternate path and if it is affected by a link failure, an alternate route is established using one of the shared spare routes and the second working path is reestablished using the alternate route.

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