Nortel Networks Corporation

Paul P Beaubien

Peter Ashwood Smith

Darek Robert Skalecki

Bruce Eric Buffam

Mieczyslaw Juliusz Surazski

Diana M Chapman

Pierre Cousineau

Al L Bryenton

Fotis Xipolatakis

In a switching protection system, a protocol is followed by a first connection controller to help facilitate the resynchronization of the network after the failure has occurred. This protocol contains the messaging system of the ability to query and store the exact sequence of logical ports and time slots that make up the data path, as a resynchronization table coupled to the first controller. The head/ingress end of the path can receive this information during set-up and can store it both locally and in shadow locations. The system also contains the ability to distinguish between signaling and data channel failures, as signaling channel failures to do not clear cross connect data but simply leave it 'ownerless'. The system also contains the ability to populate the exact sequence of logical ports and time slots accumulated in the definition of the network, as the set-up message initiated by the head controller to re-claim 'ownerless' cross connections contained on respective network elements. The system also facilitates the clearing of a &#x201c;ownerless&#x201d; cross connection after a pre-determined period of time has lapsed.

Resynchronization of control and data path state for networks

Multiple connections between switches that share the same Quality of Service (QoS) requirements are multiplexed onto a single virtual connection or switched path. The switched path may be established using a known standard or proprietary protocol, or even without knowledge of the underlying protocol. Provisioning and management software provided on the switches create originating and destination end points. When the network operator provisions an end point, a switched path call setup request is made to a networking interface which establishes a connection using a selected routing system through the network having the provisioned characteristics, such as bandwidth and QoS, of the switched path.

Method and system for multi-service cut-through switching through a connection-oriented network

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Ottawa, Canada

Paul P Beaubien