An integrated restoration system fos SDH-based ATM transport networks

This paper describes an integrated restoration strategy suitable for protecting services which are supported by an SDH-based ATM transport network. Restoration protocols which were developed independently to operate within respective SDH and ATM path layers, are coordinated in a unified software framework, The method of service protection assumes that non-ATM services transported by SDH paths are restored at the SDH layer, whilst SDH paths bearing ATM traffic remain unprotected at the SDH layer, with ATM service protection being supplied at the virtual path (VP) layer, The inter-working required to provide a seamless restoration system is explained, and computer simulations are employed to validate the operation of the integrated strategy in the presence of physical layer faults.