We propose a next-generation service-transport separated network architecture that uses packet technology. The transport network is responsible for the high speed and reliable bit transfer, and the service network is responsible for many types of network services. This separation makes it possible for the next-generation network to achieve both rapid bandwidth spreading and the speedy installation of new services. We also propose a next-generation transport network using the multi-protocol label switching transport profile (MPLS-TP) and optical networking technologies.

This paper proposes implementation methods of fast ATM layer protection switching function. The main problem in attaining fast ATM protection is the number of connections in one transmission path. The transmission delay of the signal for protection negotiation procedure is relatively less than the processing time in the end nodes. Therefore shortening of the processing time in the nodes is a crucial factor for fast rerouting. This paper focuses on this point and presents some suitable implementations on ATM nodes for fast protection switching. These architectures can attain protection time of less than 50 ms after the detection of a failure at an end node. The key is load-sharing of the hardware and firmware. This paper also sums up the effectiveness of ATM protection and the current situation of standardization in ITU-T SG13.