H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/12 (2006.01) H04L 1/00 (2006.01) H04L 12/46 (2006.01) H04L 12/56 (2006.01)
Patent
CA 2309017
The invention relates to a method and an ATM Network Element (ATM NE-1) for automatic protection switching of a Transmission Convergence Sublayer SubNetwork Connection TCS SNC. In order to provide a simple protection scheme which is suitable to work on ATM networks and able to match switching requirements of current transmission networks, the Network Element comprises a working Transmission Convergence Sublayer entity (TCS-W) as part of a first physical line interface and a protection Transmission Convergence Sublayer entity (TCS-P) as part of a second physical line interface, both entities (TCS--W,TCS-P) being individually addressable within the ATM Network Element (ATM NE-1) via a UTOPIA address, the ATM Network Element (ATM NE-1) being provided by the Transmission Convergence Sublayer with physical layer error messages indicating failures in the TCS SNC established via the working Transmission Convergence Sublayer entity (TCS-W), the ATM Network Element (ATM NE- 1) selecting for transmission the UTOPIA address (UA1) of the working Transmission Convergence Sublayer entity (TCS-W) as long as no physical layer error message is received, otherwise the UTOPIA address (UA2) of the protection Transmission Convergence Sublayer entity (TCS--P), the ATM Network Element (ATM NE-1) merging the data entering the ATM Network Element (ATM NE-1) via both, working and protection Transmission Convergence Sublayer entity (TCS-W,TCS-P).
Nokia Networks Oy
Nokia Siemens Networks Oy
Sim & Mcburney
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