发明授权
- 专利标题: Self-healing link switched ring for ATM traffic
- 专利标题(中): 自动交换环路用于ATM流量
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申请号: US09467243申请日: 1999-12-20
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公开(公告)号: US06888791B1公开(公告)日: 2005-05-03
- 发明人: Donald Russell Ellis , Brent E. Allen , David Wright Martin , Edward Ryszard Sokolowski , Patrick M. McEachern
- 申请人: Donald Russell Ellis , Brent E. Allen , David Wright Martin , Edward Ryszard Sokolowski , Patrick M. McEachern
- 申请人地址: CA
- 专利权人: Nortel Networks Limited
- 当前专利权人: Nortel Networks Limited
- 当前专利权人地址: CA
- 代理机构: Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- 主分类号: H04J3/00
- IPC分类号: H04J3/00 ; H04J3/08 ; H04L12/437 ; H04L12/56 ; H04Q11/04 ; H04L12/26
摘要:
The invention provides for a method for transporting a SONET formatted asynchronous transfer mode (ATM) signal and/or a synchronous transfer mode (STM) signal on a line switched ring over a unidirectional path. The SONET formatted ATM signal comprises cells mapped into a STS-Mc or m×STS-1s while the STM signal comprises STS-1s/VTS mapped STS-W. A unidirectional line switched ring is provided for transporting the STM STS-W using a unidirectional path switched protection protocol and the ATM STS-Mc using a unidirectional line switched protection protocol. A ring node comprises input and output ring interfaces, an STS management block, an ATM cell management block, and a non-ATM payload management block. The STS management block routes the traffic to the ATM cell management block and to the non-ATM payload management block, according to the traffic type. The STS management block also provides the UPSR protection for the STS-1s and ULSR protection for the STS-Mc. The ATM cell management block maps the add ATM cells received from the ATM ports into the STS-Mc signal, and delineates the cells from the STS-Mc to present them to the ATM ports. The non-ATM payload management block routes STM VTs or STS-1s to/from the non-ATM ports.