IMPLEMENTATION OF FAST ATM PROTECTION SWITCHING FUNCTION ON ATM NODES

This paper proposes implementation methods of fast ATM layer protectio n switching function. The main problem in attaining fast ATM protectio n is the number of connections in one transmission path. The transmiss ion delay of the signal for protection negotiation procedure is relati vely less than the processing time in the end nodes. Therefore shorten ing of the processing time in the nodes is a crucial factor for fast r erouting. This paper focuses on this point and presents some suitable implementations on ATM nodes for fast protection switching. These arch itectures can attain protection time of less than 50 ms after the dete ction of a failure at an end node. The key is load-sharing of the hard ware and firmware. This paper also sums up the effectiveness of ATM pr otection and the current situation of standardization in ITU-T SG13.